reindexer

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 Go to latest Published: May 15, 2020 License: Apache-2.0 Imports: 19 Imported by: 0

README

Reindexer

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Reindexer is an embeddable, in-memory, document-oriented database with a high-level Query builder interface.

Reindexer's goal is to provide fast search with complex queries. We at Restream weren't happy with Elasticsearch and created Reindexer as a more performant alternative.

The core is written in C++ and the application level API is in Go.

Table of contents:

Features

Key features:

  • Sortable indices
  • Aggregation queries
  • Indices on array fields
  • Complex primary keys
  • Composite indices
  • Join operations
  • Full-text search
  • Up to 64 indices for one namespace
  • ORM-like query interface
  • SQL queries
Performance

Performance has been our top priority from the start, and we think we managed to get it pretty good. Benchmarks show that Reindexer's performance is on par with a typical key-value database. On a single CPU core, we get:

  • up to 500K queries/sec for queries SELECT * FROM items WHERE id='?'
  • up to 50K queries/sec for queries SELECT * FROM items WHERE year > 2010 AND name = 'string' AND id IN (....)
  • up to 20K queries/sec for queries SELECT * FROM items WHERE year > 2010 AND name = 'string' JOIN subitems ON ...

See benchmarking results and more details in benchmarking section

Memory Consumption

Reindexer aims to consume as little memory as possible; most queries are processed without memory allocs at all.

To achieve that, several optimizations are employed, both on the C++ and Go level:

  • Documents and indices are stored in dense binary C++ structs, so they don't impose any load on Go's garbage collector.

  • String duplicates are merged.

  • Memory overhead is about 32 bytes per document + ≈4-16 bytes per each search index.

  • There is an object cache on the Go level for deserialized documents produced after query execution. Future queries use pre-deserialized documents, which cuts repeated deserialization and allocation costs

  • The Query interface uses sync.Pool for reusing internal structures and buffers. Combining of these techings let's Reindexer execute most of queries without any allocations.

Full text search

Reindexer has internal full text search engine. Full text search usage documentation and examples are here

Disk Storage

Reindexer can store documents to and load documents from disk via LevelDB. Documents are written to the storage backend asynchronously by large batches automatically in background.

When a namespace is created, all its documents are stored into RAM, so the queries on these documents run entirely in in-memory mode.

Usage

Here is complete example of basic Reindexer usage:

package main

// Import package
import (
	"fmt"
	"math/rand"

	"github.com/restream/reindexer"
	// choose how the Reindexer binds to the app (in this case "builtin," which means link Reindexer as a static library)
	_ "github.com/restream/reindexer/bindings/builtin"

	// OR link Reindexer as static library with bundled server.
	// _ "github.com/restream/reindexer/bindings/builtinserver"
	// "github.com/restream/reindexer/bindings/builtinserver/config"

)

// Define struct with reindex tags
type Item struct {
	ID       int64  `reindex:"id,,pk"`    // 'id' is primary key
	Name     string `reindex:"name"`      // add index by 'name' field
	Articles []int  `reindex:"articles"`  // add index by articles 'articles' array
	Year     int    `reindex:"year,tree"` // add sortable index by 'year' field
}

func main() {
	// Init a database instance and choose the binding (builtin)
	db := reindexer.NewReindex("builtin:///tmp/reindex/testdb")

	// OR - Init a database instance and choose the binding (connect to server)
	// Database should be created explicitly via reindexer_tool or via WithCreateDBIfMissing option:
	// db := reindexer.NewReindex("cproto://127.0.0.1:6534/testdb", reindexer.WithCreateDBIfMissing())

	// OR - Init a database instance and choose the binding (builtin, with bundled server)
	// serverConfig := config.DefaultServerConfig ()
	// db := reindexer.NewReindex("builtinserver://testdb",reindexer.WithServerConfig(100*time.Second, serverConfig))

	// Create new namespace with name 'items', which will store structs of type 'Item'
	db.OpenNamespace("items", reindexer.DefaultNamespaceOptions(), Item{})

	// Generate dataset
	for i := 0; i < 100000; i++ {
		err := db.Upsert("items", &Item{
			ID:       int64(i),
			Name:     "Vasya",
			Articles: []int{rand.Int() % 100, rand.Int() % 100},
			Year:     2000 + rand.Int()%50,
		})
		if err != nil {
			panic(err)
		}
	}

	// Query a single document
	elem, found := db.Query("items").
		Where("id", reindexer.EQ, 40).
		Get()

	if found {
		item := elem.(*Item)
		fmt.Println("Found document:", *item)
	}

	// Query multiple documents
	query := db.Query("items").
		Sort("year", false).                          // Sort results by 'year' field in ascending order
		WhereString("name", reindexer.EQ, "Vasya").   // 'name' must be 'Vasya'
		WhereInt("year", reindexer.GT, 2020).         // 'year' must be greater than 2020
		WhereInt("articles", reindexer.SET, 6, 1, 8). // 'articles' must contain one of [6,1,8]
		Limit(10).                                    // Return maximum 10 documents
		Offset(0).                                    // from 0 position
		ReqTotal()                                    // Calculate the total count of matching documents

	// Execute the query and return an iterator
	iterator := query.Exec()
	// Iterator must be closed
	defer iterator.Close()

	fmt.Println("Found", iterator.TotalCount(), "total documents, first", iterator.Count(), "documents:")

	// Iterate over results
	for iterator.Next() {
		// Get the next document and cast it to a pointer
		elem := iterator.Object().(*Item)
		fmt.Println(*elem)
	}
	// Check the error
	if err := iterator.Error(); err != nil {
		panic(err)
	}
}
SQL compatible interface

As alternative to Query builder Reindexer provides SQL compatible query interface. Here is sample of SQL interface usage:

    ...
	iterator := db.ExecSQL ("SELECT * FROM items WHERE name='Vasya' AND year > 2020 AND articles IN (6,1,8) ORDER BY year LIMIT 10")
    ...

Please note, that Query builder interface is preferable way: It have more features, and faster than SQL interface

Installation

Reindexer can run in 3 different modes:

  • embeded (builtin) Reindexer is embeded into application as static library, and does not reuqire separate server proccess.
  • embeded with server (builtinserver) Reindexer is embeded into application as static library, and start server. In this mode other clients can connect to application via cproto or http.
  • standalone Reindexer run as standalone server, application connects to Reindexer via network
Installation for server mode
  1. Install Reindexer Server
  2. go get -a github.com/restream/reindexer
Official docker image

The simplest way to get reindexer server, is pulling & run docker image from dockerhub.

docker run -p9088:9088 -p6534:6534 -it reindexer/reindexer

Dockerfile

Installation for embeded mode
Prerequirements

Reindexer's core is written in C++11 and uses LevelDB as the storage backend, so the Cmake, C++11 toolchain and LevelDB must be installed before installing Reindexer.

To build Reindexer, g++ 4.8+, clang 3.3+ or mingw64 is required.

Get Reindexer
go get -a github.com/restream/reindexer
bash $GOPATH/src/github.com/restream/reindexer/dependencies.sh
go generate github.com/restream/reindexer/bindings/builtin
# Optional (build builtin server binding)
go generate github.com/restream/reindexer/bindings/builtinserver

Advanced Usage

Index Types and Their Capabilites

Internally, structs are split into two parts:

  • indexed fields, marked with reindex struct tag
  • tuple of non-indexed fields

Queries are possible only on the indexed fields, marked with reindex tag. The reindex tag contains the index name, type, and additional options:

reindex:"<name>[[,<type>],<opts>]"

  • name – index name.
  • type – index type:
    • hash – fast select by EQ and SET match. Used by default. Allows slow and ineffecient sorting by field.
    • tree – fast select by RANGE, GT, and LT matches. A bit slower for EQ and SET matches than hash index. Allows fast sorting results by field.
    • text – full text search index. Usage details of full text search is described here
    • - – column index. Can't perform fast select because it's implemented with full-scan technic. Has the smallest memory overhead.
    • ttl - TTL index that works only with int64 fields. These indexes are quite convenient for representation of date fields (stored as UNIX timestamps) that expire after specified amount of seconds.
  • opts – additional index options:
    • pk – field is part of a primary key. Struct must have at least 1 field tagged with pk
    • composite – create composite index. The field type must be an empty struct: struct{}.
    • joined – field is a recipient for join. The field type must be []*SubitemType.
    • dense - reduce index size. For hash and tree it will save 8 bytes per unique key value. For - it will save 4-8 bytes per each element. Useful for indexes with high selectivity, but for tree and hash indexes with low selectivity can seriously decrease update performance. Also dense will slow down wide fullscan queries on - indexes, due to lack of CPU cache optimization.
    • sparse - Row (document) contains a value of Sparse index only in case if it's set on purpose - there are no empty (or default) records of this type of indexes in the row (document). It allows to save RAM but it will cost you performance - it works a bit slower than regular indexes.
    • collate_numeric - create string index that provides values order in numeric sequence. The field type must be a string.
    • collate_ascii - create case-insensitive string index works with ASCII. The field type must be a string.
    • collate_utf8 - create case-insensitive string index works with UTF8. The field type must be a string.
    • collate_custom=<ORDER> - create custom order string index. The field type must be a string. <ORDER> is sequence of letters, which defines sort order.

Fields with regular indexes are not nullable. Condition is NULL is supported only by sparse and array indexes.

Nested Structs

By default Reindexer scans all nested structs and adds their fields to the namespace (as well as indexes specified).

type Actor struct {
	Name string `reindex:"actor_name"`
}

type BaseItem struct {
	ID int64 `reindex:"id,hash,pk"`
}

type ComplexItem struct {
	BaseItem         // Index fields of BaseItem will be added to reindex
	actor    []Actor // Index fields of Actor will be added to reindex as arrays
	Name     string  `reindex:"name"`
	Year     int     `reindex:"year,tree"`
	parent   *Item   `reindex:"-"` // Index fields of parent will NOT be added to reindex
}
Sort

Reindexer can sort documents by fields (including nested and fields of joined namespaces) or by expressions in ascending or descending order.

Sort expressions can contain fields names (including nested and fields of joined namespaces) of int, float or bool type, numbers, functions rank() and abs(), parenthesis and arithmetic operations: +, - (unary and binary), * and /. If field name followed by '+' they must be separated by space (to distinguish composite index name). Fields of joined namespaces writes in form joined_namespace.field. Abs() means absolute value of an argument. Rank() means fulltext rank of match and is applicable only in fulltext query. In SQL query sort expression must be quoted.

type Person struct {
	Name string `reindex:"name"`
	Age  int    `reindex:"age"`
}

type City struct {
	Id                 int `reindex:"id"`
	NumberOfPopulation int `reindex:"population"`
}

type Actor struct {
	ID          int    `reindex:"id"`
	PersonData  Person `reindex:"person"`
	Price       int    `reindex:"price"`
	Description string `reindex:"description,text"`
	BirthPlace  int    `reindex:"birth_place_id"`
}
....

query := db.Query("actors").Sort("id", true)           // Sort by field
....
query = db.Query("actors").Sort("person.age", true)   // Sort by nested field
....
// Sort by joined field
query = db.Query("actors").
	Join(db.Query("cities")).On("birth_place_id", reindexer.EQ, "id").
	Sort("cities.population", true)
....
// Sort by expression:
query = db.Query("actors").Sort("person.age / -10 + price / 1000 * (id - 5)", true)
....
query = db.Query("actors").Where("description", reindexer.EQ, "ququ").
    Sort("rank() + id / 100", true)   // Sort with fulltext rank
....
// In SQL query:
iterator := db.ExecSQL ("SELECT * FROM actors ORDER BY person.name ASC")
....
iterator := db.ExecSQL ("SELECT * FROM actors WHERE description = 'ququ' ORDER BY 'rank() + id / 100' DESC")

It is also possible to set a custom sort order like this

type SortModeCustomItem struct {
	ID      int    `reindex:"id,,pk"`
	InsItem string `reindex:"item_custom,hash,collate_custom=a-zA-Z0-9"`
}

or like this

type SortModeCustomItem struct {
	ID      int    `reindex:"id,,pk"`
	InsItem string `reindex:"item_custom,hash,collate_custom=АаБбВвГгДдЕеЖжЗзИиКкЛлМмНнОоПпРрСсТтУуФфХхЦцЧчШшЩщЪъЫыЬьЭ-ЯAaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0-9ЁёЙйэ-я"`
}

The very first character in this list has the highest priority, priority of the last character is the smallest one. It means that sorting algorithm will put items that start with the first character before others. If some characters are skipped their priorities would have their usual values (according to characters in the list).

Update queries

UPDATE queries are used to modify the existing records in a namespace. There are several kinds of update queries: updating existing fields, adding new fields and dropping existing non-indexed fields.

UPDATE Sql-Syntax

UPDATE nsName
SET field1 = value1, field2 = value2, ..
WHERE condition;

It is also possible to use arithmetic expressions with +, -, /, * and brackets

UPDATE NS SET field1 = field2+field3-(field4+5)/2

make an array-field empty

UPDATE NS SET arrayfield = [] where id = 100

and set field to null

UPDATE NS SET field = null where id > 100

In case of non-indexed fields setting it's value to a value of a different type will replace it completely, in case of indexed fields it is only possible to convert it from adjacent type (integral types and bool), convert numeric strings (like "123456") to integral types and back. Setting indexed field to null resets it to a default value.

It is possible to add new fields to existing items

UPDATE Ns set newField = 'Brand new!' where id > 100

and even add a new field by a complex nested path like this

UPDATE Ns set nested.nested2.nested3.nested4.newField = 'new nested field!' where id > 100

will create the following nested objects: nested, nested2, nested3, nested4 and newField as a member of object nested4.

Example of using Update queries in golang code

db.Query("items").Where("id", reindexer.EQ, 40).Set("field1", values).Update()

Reindexer allows to update and add object fields. Object can be set by either a struct, a map or a byte array (that is a JSON version of object representation).

type ClientData struct {
    Name          string `reindex:"name" json:"name"`
	Age           int    `reindex:"age" json:"age"`
	Address       int    `reindex:"year" json:"year"`
	Occupation    string `reindex:"occupation" json:"occupation"`
	TaxYear       int    `reindex:tax_year json:"tax_year"`
	TaxConsultant string `reindex:tax_consultant json:"tax_consultant"`
}
type Client struct {
	ID      int         `reindex:"id" json:"id"`
	Data    ClientData  `reindex:"client_data" json:"client_data"`
	...
}
clientData := updateClientData(clientId)
db.Query("clients").Where("id", reindexer.EQ, 100).SetObject("client_data", clientData).Update()

Map in golang should always has string as a key. map[string]interface{} is a perfect choice.

Updating of object field by Sql statement

UPDATE clients SET client_data = {"Name":"John Doe","Age":40,"Address":"Fifth Avenue, Manhattan","Occupation":"Bank Manager","TaxYear":1999,"TaxConsultant":"Jane Smith"} where id = 100;

UPDATE Sql-Syntax of queries that drop existing non-indexed fields

UPDATE nsName
DROP field1, field2, ..
WHERE condition;

db.Query("items").Where("id", reindexer.EQ, 40).Drop("field1").Update()
Transactions and batch update

Reindexer supports transactions. Transaction are performs atomic namespace update. There are synchronous and async transaction available. To start transaction method db.BeginTx() is used. This method creates transaction object, which provides usual Update/Upsert/Insert/Delete interface for application.

Synchronous mode

	// Create new transaction object
	tx, err := db.BeginTx("items"); 
	if err != nil {
		panic(err)
	}
	// Fill transaction object
	tx.Upsert(&Item{ID: 100})
	tx.Upsert(&Item{ID: 101})
	tx.Query().WhereInt("id", reindexer.EQ, 102).Set("Name", "Petya").Update()
	// Apply transaction
	if err := tx.Commit(); err != nil {
		panic(err)
	}
Async batch mode

For speed up insertion of bulk records async mode can be used.


	// Create new transaction object
	tx, err := db.BeginTx("items"); 
	if err != nil {
		panic(err)
	}
	// Prepare transaction object async.
	tx.UpsertAsync(&Item{ID: 100},func(err error) {})
	tx.UpsertAsync(&Item{ID: 100},func(err error) {})
	// Wait for async operations done, and apply transaction.
	if err := tx.Commit(); err != nil {
		panic(err)
	}

The second argument of UpsertAsync is completion function, which will be called after receiving server response. Also, if any error occurred during prepare process, then tx.Commit should return an error. So it is enough, to check error returned by tx.Commit - to be sure, that all data has been successfully committed or not.

Transactions commit strategies

Depends on amount changes in transaction there are 2 possible Commit strategies:

  • Locked atomic update. Reindexer locks namespace and applying all changes under common lock. This mode is used with small amounts of changes.
  • Copy & atomic replace. In this mode Reindexer makes namespace's snapshot, applying all changes to this snapshot, and atomically replaces namespace without lock

Data amount for choosing Commit strategy can be choose in namespaces config. pls refer DBNamespacesConfig

Implementation notes
  1. Transaction object is not thread safe and can't be used from different goroutines.
  2. Transaction object holds Reindexer's resources, therefore application should explicitly call Rollback or Commit, otherwise resources will leak
  3. It is safe to call Rollback after Commit
  4. It is possible ro call Query from transaction by call tx.Query("ns").Exec() .... Only read-committed isolation is available. Changes made in active transaction is invisible to current and another transactions.
Join

Reindexer can join documents from multiple namespaces into a single result:

type Actor struct {
	ID        int    `reindex:"id"`
	Name      string `reindex:"name"`
	IsVisible bool   `reindex:"is_visible"`
}

type ItemWithJoin struct {
	ID          int      `reindex:"id"`
	Name        string   `reindex:"name"`
	ActorsIDs   []int    `reindex:"actors_ids"`
	ActorsNames []int    `reindex:"actors_names"`
	Actors      []*Actor `reindex:"actors,,joined"`
}
....

query := db.Query("items_with_join").Join(
	db.Query("actors").
		WhereBool("is_visible", reindexer.EQ, true),
	"actors"
).On("actors_ids", reindexer.SET, "id")

query.Exec ()

In this example, Reindexer uses reflection under the hood to create Actor slice and copy Actor struct.

Join query may have from one to several On conditions connected with And (by default), Or or Not operators:

query := db.Query("items_with_join").
	Join(
		db.Query("actors").
			WhereBool("is_visible", reindexer.EQ, true),
		"actors").
	On("actors_ids", reindexer.SET, "id").
	Or().
	On("actors_names", reindexer.SET, "name")

An InnerJoin combines data from two namespaces where there is a match on the joining fields in both namespaces. A LeftJoin returns all valid items from the namespaces on the left side of the LeftJoin keyword, along with the values from the table on the right side, or nothing if a matching item doesn't exist. Join is an alias for LeftJoin.

InnerJoins can be used as a condition in Where clause:

query1 := db.Query("items_with_join").
	WhereInt("id", reindexer.RANGE, []int{0, 100}).
	Or().
	InnerJoin(db.Query("actors").WhereString("name", reindexer.EQ, "ActorName"), "actors").
	On("actors_ids", reindexer.SET, "id").
	Or().
	InnerJoin(db.Query("actors").WhereInt("id", reindexer.RANGE, []int{100, 200}), "actors").
	On("actors_ids", reindexer.SET, "id")

query2 := db.Query("items_with_join").
	WhereInt("id", reindexer.RANGE, []int{0, 100}).
	Or().
	OpenBracket().
		InnerJoin(db.Query("actors").WhereString("name", reindexer.EQ, "ActorName"), "actors").
		On("actors_ids", reindexer.SET, "id").
		InnerJoin(db.Query("actors").WhereInt("id", reindexer.RANGE, []int{100, 200}), "actors").
		On("actors_ids", reindexer.SET, "id").
	CloseBracket()

query3 := db.Query("items_with_join").
	WhereInt("id", reindexer.RANGE, []int{0, 100}).
	Or().
	InnerJoin(db.Query("actors").WhereInt("id", reindexer.RANGE, []int{100, 200}), "actors").
	On("actors_ids", reindexer.SET, "id").
	Limit(0)

Note that usually Or operator implements short-circuiting for Where conditions: if the previous condition is true the next one is not evaluated. But in case of InnerJoin it works differently: in query1 (from the example above) both InnerJoin conditions are evaluated despite the result of WhereInt. Limit(0) as part of InnerJoin (query3 from the example above) does not join any data - it works like a filter only to verify conditions.

Joinable interface

To avoid using reflection, Item can implement Joinable interface. If that implemented, Reindexer uses this instead of the slow reflection-based implementation. This increases overall performance by 10-20%, and reduces the amount of allocations.

// Joinable interface implementation.
// Join adds items from the joined namespace to the `ItemWithJoin` object.
// When calling Joinable interface, additional context variable can be passed to implement extra logic in Join.
func (item *ItemWithJoin) Join(field string, subitems []interface{}, context interface{}) {

	switch field {
	case "actors":
		for _, joinItem := range subitems {
			item.Actors = append(item.Actors, joinItem.(*Actor))
		}
	}
}
Complex Primary Keys and Composite Indexes

A Document can have multiple fields as a primary key. To enable this feature add composite index to struct. Composite index is an index that involves multiple fields, it can be used instead of several separate indexes.

type Item struct {
	ID    int64 `reindex:"id"`     // 'id' is a part of a primary key
	SubID int   `reindex:"sub_id"` // 'sub_id' is a part of a primary key
	// Fields
	//	....
	// Composite index
	_ struct{} `reindex:"id+sub_id,,composite,pk"`
}

OR

type Item struct {
	ID       int64 `reindex:"id,-"`         // 'id' is a part of primary key, WITHOUT personal searchable index
	SubID    int   `reindex:"sub_id,-"`     // 'sub_id' is a part of a primary key, WITHOUT a personal searchable index
	SubSubID int   `reindex:"sub_sub_id,-"` // 'sub_sub_id' is a part of a primary key WITHOUT a personal searchable index

	// Fields
	// ....

	// Composite index
	_ struct{} `reindex:"id+sub_id+sub_sub_id,,composite,pk"`
}

Also composite indexes are useful for sorting results by multiple fields:

type Item struct {
	ID     int64 `reindex:"id,,pk"`
	Rating int   `reindex:"rating"`
	Year   int   `reindex:"year"`

	// Composite index
	_ struct{} `reindex:"rating+year,tree,composite"`
}

...
	// Sort query resuls by rating first, then by year
	query := db.Query("items").Sort("rating+year", true)

	// Sort query resuls by rating first, then by year, and put item where rating == 5 and year == 2010 first
	query := db.Query("items").Sort("rating+year", true,[]interface{}{5,2010})

For make query to the composite index, pass []interface{} to .WhereComposite function of Query builder:

	// Get results where rating == 5 and year == 2010
	query := db.Query("items").WhereComposite("rating+year", reindexer.EQ,[]interface{}{5,2010})
Aggregations

Reindexer allows to retrive aggregated results. Currently Average, Sum, Minimum, Maximum Facet and Distinct aggregations are supported.

  • AggregateMax - get maximum field value
  • AggregateMin - get manimum field value
  • AggregateSum - get sum field value
  • AggregateAvg - get averatge field value
  • AggregateFacet - get fields facet value
  • Distinct - get list of unique values of the field

In order to support aggregation, Query has methods AggregateAvg, AggregateSum, AggregateMin, AggregateMax, AggregateFacet and Distinct those should be called before the Query execution: this will ask reindexer to calculate data aggregations. Aggregation Facet is applicable to multiple data columns and the result of that could be sorted by any data column or 'count' and cutted off by offset and limit. In order to support this functionality method AggregateFacet returns AggregationFacetRequest which has methods Sort, Limit and Offset.

To get aggregation results, Iterator has method AggResults: it is available after query execution and returns slice of results.

Example code for aggregate items by price and name


	query := db.Query("items")
	query.AggregateMax("price")
	query.AggregateFacet("name", "price").Sort("name", true).Sort("count", false).Offset(10).Limit(100)
	iterator := query.Exec()

	aggMaxRes := iterator.AggResults()[0]

	fmt.Printf ("max price = %d", aggMaxRes.Value)

	aggFacetRes := iterator.AggResults()[1]

	fmt.Printf ("'name' 'price' -> count")
	for _, facet := range aggFacetRes.Facets {
		fmt.Printf ("'%s' '%s' -> %d", facet.Values[0], facet.Values[1], facet.Count)
	}



	query := db.Query("items")
	query.Distinct("name").Distinct("price")
	iterator := query.Exec()

	aggResults := iterator.aggResults()

	distNames := aggResults[0]
	fmt.Println ("names:")
	for _, name := range distNames.Distincts {
		fmt.Println(name)
	}

	distPrices := aggResults[1]
	fmt.Println ("prices:")
	for _, price := range distPrices.Distincts {
		fmt.Println(price)
	}
Searching in array fields with matching array indexes

Reindexer allows to search data in array fields when matching values have same indixes positions. For instance, we've got an array of structures:

type Elem struct {
   F1 int `reindex:"f1"`
   F2 int `reindex:"f2"`
}

type A struct {
   Elems []Elem
}

Common attempt to search values in this array

Where ("f1",EQ,1).Where ("f2",EQ,2)

finds all items of array Elem[] where f1 is equal to 1 and f2 is equal to 2.

EqualPosition function allows to search in array fields with equal indices. Search like this:

Where("f1", reindexer.GE, 5).Where("f2", reindexer.EQ, 100).EqualPosition("f1", "f2")

or

SELECT * FROM Namespace WHERE f1 >= 5 AND f2 = 100 EQUAL_POSITION(f1,f2);

finds all items of array Elem[] where f1 is greater or equal to 5 and f2 is equal to 100 and their indices are always equal (for instance, query returned 5 items where only 3rd element of array has appropriate values).

With complex expressions (expressions with brackets) equal_position() works only within a bracket:

SELECT * FROM Namespace WHERE (f1 >= 5 AND f2 = 100 EQUAL_POSITION(f1,f2)) OR (f3 = 3 AND f4 < 4 EQUAL_POSITION(f3,f4));
Atomic on update functions

There are atomic functions, which executes under namespace lock, and therefore guarantes data consistency:

  • serial - sequence of integer, useful for uniq ID generation
  • timestamp - current time stamp of operation, useful for data syncronisation

These functions can be passed to Upsert/Insert/Update in 3-rd and next arguments.

If these functions are provided, the passed by reference item will be changed to updated value

   // set ID field from serial generator   
   db.Insert ("items",&item,"id=serial()")

   // set current timestamp in nanoseconds to updated_at field
   db.Update ("items",&item,"updated_at=now(NSEC)")

   // set current timestamp and ID
   db.Upsert ("items",&item,"updated_at=now(NSEC)","id=serial()")
Expire Data from Namespace by Setting TTL

Data expiration is useful for some classes of information, including machine generated event data, logs, and session information that only need to persist for a limited period of time.

Reindexer makes it possible to set TTL (time to live) for Namespace items. Adding TtlIndex to Namespace automatically removes items after a specified number of seconds.

Ttl indexes work only with int64 fields and store UNIX timestamp data. Items containig ttl index expire after expire_after seconds. Example of decalring TtlIndex in Golang:

            type NamespaceExample struct {
                ID   int    `reindex:"id,,pk" json:"id"`
                Date int64  `reindex:"date,ttl,,expire_after=3600" json:"date"`
            }
            ...
            ns.Date = time.Now().Unix()

In this case items of namespace NamespaceExample expire in 3600 seconds after NamespaceExample.Date field value (which is UNIX timestamp).

A TTL index supports queries in the same way non-TTL indexes do.

Direct JSON operations
Upsert data in JSON format

If source data is available in JSON format, then it is possible to improve performance of Upsert/Delete operations by directly passing JSON to reindexer. JSON deserialization will be done by C++ code, without extra allocs/deserialization in Go code.

Upsert or Delete functions can process JSON just by passing []byte argument with json

	json := []byte (`{"id":1,"name":"test"}`)
	db.Upsert  ("items",json)

It is just faster equalent of:

	item := &Item{}
	json.Unmarshal ([]byte (`{"id":1,"name":"test"}`),item)
	db.Upsert ("items",item)
Get Query results in JSON format

In case of requiment to serialize results of Query in JSON format, then it is possible to improve performance by directly obtaining results in JSON format from reindexer. JSON serialization will be done by C++ code, without extra allocs/serialization in Go code.

...		
	iterator := db.Query("items").
		Select ("id","name").        // Filter output JSON: Select only "id" and "name" fields of items, another fields will be ommited
		Limit (1).
		ExecToJson ("root_object")   // Name of root object of output JSON

	json,err := iterator.FetchAll()
	// Check the error
	if err != nil {
		panic(err)
	}
	fmt.Printf ("%s\n",string (json))
...

This code will print something like:

{"root_object":[{"id":1,"name":"test"}]}
Using object cache

To avoid race conditions, by default object cache is turned off and all objects are allocated and deserialized from reindexer internal format (called CJSON) per each query. The deserialization is uses reflection, so it's speed is not optimal (in fact CJSON deserialization is ~3-10x faster than JSON, and ~1.2x faster than GOB), but perfrormance is still seriously limited by reflection overhead.

There are 2 ways to enable object cache:

  • Provide DeepCopy interface
  • Ask query return shared objects from cache
DeepCopy interface

If object is implements DeepCopy intreface, then reindexer will turn on object cache and use DeepCopy interface to copy objects from cache to query results. The DeepCopy interface is responsible to make deep copy of source object.

Here is sample of DeepCopy interface implementation

func (item *Item) DeepCopy () interface {} {
	copyItem := &Item{
		ID: item.ID,
		Name: item.Name,
		Articles: make ([]int,cap (item.Articles),len (item.Articles)),
		Year: item.Year,
	}
	copy (copyItem.Articles,item.Articles)
	return copyItem
}

There are availbale code generation tool gencopy, which can automatically generate DeepCopy interface for structs.

Get shared objects from object cache (USE WITH CAUTION)

To speed up queries and do not allocate new objects per each query it is possible ask query return objects directly from object cache. For enable this behaviour, call AllowUnsafe(true) on Iterator.

WARNING: when used AllowUnsafe(true) queries returns shared pointers to structs in object cache. Therefore application MUST NOT modify returned objects.

	res, err := db.Query("items").WhereInt ("id",reindexer.EQ,1).Exec().AllowUnsafe(true).FetchAll()
	if err != nil {
		panic (err)
	}

	if len (res) > 1 {
		// item is SHARED pointer to struct in object cache
		item = res[0].(*Item)

		// It's OK - fmt.Printf will not modify item
		fmt.Printf ("%v",item)

		// It's WRONG - can race, and will corrupt data in object cache
		item.Name = "new name"
	}

Logging, debug and profiling

Turn on logger

Reindexer logger can be turned on by db.SetLogger() method, just like in this snippet of code:

type Logger struct {
}
func (Logger) Printf(level int, format string, msg ...interface{}) {
	log.Printf(format, msg...)
}
...
	db.SetLogger (Logger{})
Debug queries

Another useful feature is debug print of processed Queries. To debug print queries details there are 2 methods:

  • db.SetDefaultQueryDebug(namespace string,level int) - it globally enables print details of all queries by namespace

  • query.Debug(level int) - print details of query execution level is level of verbosity:

  • reindexer.INFO - will print only query conditions

  • reindexer.TRACE - will print query conditions and execution details with timings

  • query.Explain () - calculate and store query execution details.

  • iterator.GetExplainResults () - return query execution details

Profiling

Because reindexer core is written in C++ all calls to reindexer and their memory consumption are not visible for go profiler. To profile reindexer core there are cgo profiler available. cgo profiler now is part of reindexer, but it can be used with any another cgo code.

Usage of cgo profiler is very similar with usage of go profiler.

  1. Add import:
import _ "github.com/restream/reindexer/pprof"
  1. If your application is not already running an http server, you need to start one. Add "net/http" and "log" to your imports and the following code to your main function:
go func() {
	log.Println(http.ListenAndServe("localhost:6060", nil))
}()
  1. Run application with envirnoment variable HEAPPROFILE=/tmp/pprof
  2. Then use the pprof tool to look at the heap profile:
pprof -symbolize remote http://localhost:6060/debug/cgo/pprof/heap
Prometheus

Reindexer has a banch prometheus metrics available via http-URL /metrics. This metrics may be enabled by passing --prometheus as reindexer_server command line argument or by setting metrics:prometheus flag in server yaml-config file. Some of the metrics also require perfstats to be enabled in profiling-config

reindexer_qps_total - total queries per second for each database, namespace and query type reindexer_avg_latency - average queryies latency for each database, namespace and query type reindexer_caches_size_bytes, reindexer_indexes_size_bytes, reindexer_data_size_bytes - caches, indexes and data size for each namespace reindexer_items_count - items count in each namespace reindexer_memory_allocated_bytes - current amount of dynamicly allocated memory according to tcmalloc/jemalloc reindexer_rpc_clients_count - current number of RPC clients for each database reindexer_input_traffic_total_bytes, reindexer_output_traffic_total_bytes - total input/output RPC/http traffic for each database

Maintenance

For maintenance and work with data, stored in reindexer database there are 2 methods available:

  • Web interface
  • Command line tool
Web interface

Reindexer server and builtinserver binding mode are coming with Web UI out-of-the box. To open web UI just start reindexer server or application with builtinserver mode, and open http://server-ip:9088/face in browser

Command line tool

To work with database from command line you can use reindexer command line tool Command line tool have the following functions

  • Backup whole database into text file or console.
  • Make queries to database
  • Modify documents and DB metadata

Command line tool can run in 2 modes. With server via network, and in server-less mode, directly with storage.

Dump and restore database

Database creation via reindexer_tool:

reindexer_tool --dsn cproto://127.0.0.1:6534/mydb --command '\databases create mydb'

To dump and restore database in normal way there reindexer command line tool is used

Backup whole database into single backup file:

reindexer_tool --dsn cproto://127.0.0.1:6534/mydb --command '\dump' --output mydb.rxdump

Restore database from backup file:

reindexer_tool --dsn cproto://127.0.0.1:6534/mydb --filename mydb.rxdump
Replication

Reindexer supports master slave replication. To create slave DB the following command can be used:

reindexer_tool --dsn cproto://127.0.0.1:6534/slavedb --command '\upsert #config {"type":"replication","replication":{"role":"slave","master_dsn":"cproto://127.0.0.1:6534/masterdb","cluster_id":2}}'

More details about replication is here

Security

Reindexer server supports login/password authorization for http/rpc client with different access levels for each user/database. To enable this feature security flag should be set in server.yml. If security option is active reindexer will try to load users list from users.yml or users.json(deprecate) found in database path. If users-file was not found the default one will be created automaticly (default login/password are reindexer/reindexer)

Alternative storages

A list of storages, which may be used by reindexer as an alternative for LevelDB.

Storage type may be selected by passing command line option to reindexer_server like this:

reindexer_server --db /tmp/rx --engine rocksdb

Also storage type may be set via server's config.yml:

storage:
  engine: leveldb

To configure storage type for Go bindings either bindings.ConnectOptions (for builtin) or confg.ServerConfig (for builtinserver) structs may be used.

RocksDB

Reindexer will try to autodetect RocksDB library and it's dependencies at compile time if CMake flag ENABLE_ROCKSDB was passed (enabled by default). If reindexer library was built with rocksdb, it requires Go build tag rocksdb in order to link with go-applications and go-bindinds.

Integration with other program languages

A list of connectors for work with Reindexer via other program languages (TBC later):

Pyreindexer
  1. Pyreindexer for Python (version >=3.6 is required). For setup run:
pip3 install git+https://github.com/Restream/reindexer.git
HTTP REST API

The simplest way to use reindexer with any program language - is using REST API. The complete REST API documentation is here.
Or explore interactive version of Reindexer's swagger documentation

Limitations and known issues

Currently Reindexer is stable and production ready, but it is still a work in progress, so there are some limitations and issues:

  • Internal C++ API is not stabilized and is subject to change.

Getting help

You can get help in several ways:

  1. Join Reindexer Telegram group
  2. Write an issue

Documentation

Index

Constants

View Source 
const (
	ConfigNamespaceName           = "#config"
	MemstatsNamespaceName         = "#memstats"
	NamespacesNamespaceName       = "#namespaces"
	PerfstatsNamespaceName        = "#perfstats"
	QueriesperfstatsNamespaceName = "#queriesperfstats"
	ClientsStatsNamespaceName     = "#clientsstats"
)
View Source 
const (
	CollateNone    = bindings.CollateNone
	CollateASCII   = bindings.CollateASCII
	CollateUTF8    = bindings.CollateUTF8
	CollateNumeric = bindings.CollateNumeric
	CollateCustom  = bindings.CollateCustom
)
View Source 
const (
	// Equal '='
	EQ = bindings.EQ
	// Greater '>'
	GT = bindings.GT
	// Lower '<'
	LT = bindings.LT
	// Greater or equal '>=' (GT|EQ)
	GE = bindings.GE
	// Lower or equal '<'
	LE = bindings.LE
	// One of set 'IN []'
	SET = bindings.SET
	// All of set
	ALLSET = bindings.ALLSET
	// In range
	RANGE = bindings.RANGE
	// Any value
	ANY = bindings.ANY
	// Empty value (usualy zero len array)
	EMPTY = bindings.EMPTY
	// String like pattern
	LIKE = bindings.LIKE
)

Condition types

View Source 
const (
	// ERROR Log level
	ERROR = bindings.ERROR
	// WARNING Log level
	WARNING = bindings.WARNING
	// INFO Log level
	INFO = bindings.INFO
	// TRACE Log level
	TRACE = bindings.TRACE
)
View Source 
const (
	AggAvg      = bindings.AggAvg
	AggSum      = bindings.AggSum
	AggFacet    = bindings.AggFacet
	AggMin      = bindings.AggMin
	AggMax      = bindings.AggMax
	AggDistinct = bindings.AggDistinct
)

Aggregation funcs

View Source 
const (
	ErrCodeOK               = bindings.ErrOK
	ErrCodeParseSQL         = bindings.ErrParseSQL
	ErrCodeQueryExec        = bindings.ErrQueryExec
	ErrCodeParams           = bindings.ErrParams
	ErrCodeLogic            = bindings.ErrLogic
	ErrCodeParseJson        = bindings.ErrParseJson
	ErrCodeParseDSL         = bindings.ErrParseDSL
	ErrCodeConflict         = bindings.ErrConflict
	ErrCodeParseBin         = bindings.ErrParseBin
	ErrCodeForbidden        = bindings.ErrForbidden
	ErrCodeWasRelock        = bindings.ErrWasRelock
	ErrCodeNotValid         = bindings.ErrNotValid
	ErrCodeNetwork          = bindings.ErrNetwork
	ErrCodeNotFound         = bindings.ErrNotFound
	ErrCodeStateInvalidated = bindings.ErrStateInvalidated
	ErrCodeTimeout          = bindings.ErrTimeout
)

Reindexer error codes

Variables

View Source 
var (
	ErrEmptyNamespace    = bindings.NewError("rq: empty namespace name", ErrCodeParams)
	ErrEmptyFieldName    = bindings.NewError("rq: empty field name in filter", ErrCodeParams)
	ErrEmptyAggFieldName = bindings.NewError("rq: empty field name in aggregation", ErrCodeParams)
	ErrCondType          = bindings.NewError("rq: cond type not found", ErrCodeParams)
	ErrOpInvalid         = bindings.NewError("rq: op is invalid", ErrCodeParams)
	ErrAggInvalid        = bindings.NewError("rq: agg is invalid", ErrCodeParams)
	ErrNoPK              = bindings.NewError("rq: No pk field in struct", ErrCodeParams)
	ErrWrongType         = bindings.NewError("rq: Wrong type of item", ErrCodeParams)
	ErrMustBePointer     = bindings.NewError("rq: Argument must be a pointer to element, not element", ErrCodeParams)
	ErrNotFound          = bindings.NewError("rq: Not found", ErrCodeNotFound)
	ErrDeepCopyType      = bindings.NewError("rq: DeepCopy() returns wrong type", ErrCodeParams)
)

Functions

func GetCondType 

func GetCondType(name string) (int, error)

func WithAppName 

func WithAppName(appName string) interface{}

func WithCgoLimit 

func WithCgoLimit(cgoLimit int) interface{}

func WithConnPoolSize 

func WithConnPoolSize(connPoolSize int) interface{}

func WithCreateDBIfMissing 

func WithCreateDBIfMissing() interface{}

func WithNetCompression 

func WithNetCompression() interface{}

func WithRetryAttempts 

func WithRetryAttempts(read int, write int) interface{}

func WithServerConfig 

func WithServerConfig(startupTimeout time.Duration, serverConfig *config.ServerConfig) interface{}

func WithTimeouts 

func WithTimeouts(loginTimeout time.Duration, requestTimeout time.Duration) interface{}

Types

type AggregateFacetRequest 

type AggregateFacetRequest struct {
	// contains filtered or unexported fields
}

func (*AggregateFacetRequest) Limit 

func (r *AggregateFacetRequest) Limit(limit int) *AggregateFacetRequest

func (*AggregateFacetRequest) Offset 

func (r *AggregateFacetRequest) Offset(offset int) *AggregateFacetRequest

func (*AggregateFacetRequest) Sort 

func (r *AggregateFacetRequest) Sort(field string, desc bool) *AggregateFacetRequest

Use field 'count' to sort by facet's count value.

type AggregationResult 

type AggregationResult struct {
	Fields []string `json:"fields"`
	Type   string   `json:"type"`
	Value  float64  `json:"value,omitempty"`
	Facets []struct {
		Values []string `json:"values"`
		Count  int      `json:"count"`
	} `json:"facets,omitempty"`
	Distincts []string `json:"distincts,omitempty"`
}

type CacheMemStat 

type CacheMemStat struct {
	// Total memory consumption by this cache
	TotalSize int64 `json:"total_size"`
	// Count of used elements stored in this cache
	ItemsCount int64 `json:"items_count"`
	// Count of empty elements slots in this cache
	EmptyCount int64 `json:"empty_count"`
	// Number of hits of queries, to store results in cache
	HitCountLimit int64 `json:"hit_count_limit"`
}

CacheMemStat information about reindexer's cache memory consumption

type ClientConnectionStat 

type ClientConnectionStat struct {

	// Connection identifier
	ConnectionId int64 `json:"connection_id"`
	// client ip address
	Ip string `json:"ip"`
	// User name
	UserName string `json:"user_name"`
	// User right
	UserRights string `json:"user_rights"`
	// Database name
	DbName string `json:"db_name"`
	// Current activity
	CurrentActivity string `json:"current_activity"`
	// Server start time in unix timestamp
	StartTime int64 `json:"start_time"`
	// Receive bytes
	RecvBytes int64 `json:"recv_bytes"`
	// Sent bytes
	SentBytes int64 `json:"sent_bytes"`
	// Client version string
	ClientVersion string `json:"client_version"`
}

ClientConnectionStat is information about client connection

type DBConfigItem 

type DBConfigItem struct {
	Type        string                `json:"type"`
	Profiling   *DBProfilingConfig    `json:"profiling,omitempty"`
	Namespaces  *[]DBNamespacesConfig `json:"namespaces,omitempty"`
	Replication *DBReplicationConfig  `json:"replication,omitempty"`
}

DBConfigItem is structure stored in system '#config` namespace

type DBNamespacesConfig 

type DBNamespacesConfig struct {
	// Name of namespace, or `*` for setting to all namespaces
	Namespace string `json:"namespace"`
	// Log level of queries core logger
	LogLevel string `json:"log_level"`
	// Join cache mode. Can be one of on, off, aggressive
	JoinCacheMode string `json:"join_cache_mode"`
	// Enable namespace lazy load (namespace shoud be loaded from disk on first call, not at reindexer startup)
	Lazyload bool `json:"lazyload"`
	// Unload namespace data from RAM after this idle timeout in seconds. If 0, then data should not be unloaded
	UnloadIdleThreshold int `json:"unload_idle_threshold"`
	// Enable namespace copying for transaction with steps count greater than this value (if copy_politics_multiplier also allows this)
	StartCopyPolicyTxSize int `json:"start_copy_policy_tx_size"`
	// Disables copy policy if namespace size is greater than copy_policy_multiplier * start_copy_policy_tx_size
	CopyPolicyMultiplier int `json:"copy_policy_multiplier"`
	// Force namespace copying for transaction with steps count greater than this value
	TxSizeToAlwaysCopy int `json:"tx_size_to_always_copy"`
	// Timeout before background indexes optimization start after last update. 0 - disable optimizations
	OptimizationTimeout int `json:"optimization_timeout_ms"`
	// Maximum number of background threads of sort indexes optimization. 0 - disable sort optimizations
	OptimizationSortWorkers int `json:"optimization_sort_workers"`
}

DBNamespacesConfig is part of reindexer configuration contains namespaces options

type DBProfilingConfig 

type DBProfilingConfig struct {
	// Minimum query execution time to be recoreded in #queriesperfstats namespace
	QueriesThresholdUS int `json:"queries_threshold_us"`
	// Enables tracking memory statistics
	MemStats bool `json:"memstats"`
	// Enables tracking overal perofrmance statistics
	PerfStats bool `json:"perfstats"`
	// Enables record queries perofrmance statistics
	QueriesPerfStats bool `json:"queriesperfstats"`
}

DBProfilingConfig is part of reindexer configuration contains profiling options

type DBReplicationConfig 

type DBReplicationConfig struct {
	// Replication role. One of  none, slave, master
	Role string `json:"role"`
	// DSN to master. Only cproto schema is supported
	MasterDSN string `json:"master_dsn"`
	// Cluster ID - must be same for client and for master
	ClusterID int `json:"cluster_id"`
	// force resync on logic error conditions
	ForceSyncOnLogicError bool `json:"force_sync_on_logic_error"`
	// force resync on wrong data hash conditions
	ForceSyncOnWrongDataHash bool `json:"force_sync_on_wrong_data_hash"`
	// List of namespaces for replication. If emply, all namespaces. All replicated namespaces will become read only for slave
	Namespaces []string `json:"namespaces"`
}

DBReplicationConfig is part of reindexer configuration contains replication options

type DeepCopy 

type DeepCopy interface {
	DeepCopy() interface{}
}

type Error 

type Error interface {
	Error() string
	Code() int
}

Error - reindexer Error interface

type ExplainResults 

type ExplainResults struct {
	// Total query execution time
	TotalUs int `json:"total_us"`
	// Query prepare and optimize time
	PrepareUs int `json:"prepare_us"`
	// Indexes keys selection time
	IndexesUs int `json:"indexes_us"`
	// Query post process time
	PostprocessUS int `json:"postprocess_us"`
	// Intersection loop time
	LoopUs int `json:"loop_us"`
	// Index, which used for sort results
	SortIndex string `json:"sort_index"`
	// General sort time
	GeneralSortUs int `json:"general_sort_us"`
	// Optimization of sort by uncompleted index has been performed
	SortByUncommittedIndex bool `json:"sort_by_uncommitted_index"`
	// Filter selectors, used to proccess query conditions
	Selectors []struct {
		// Field or index name
		Field string `json:"field"`
		// Method, used to process condition
		Method string `json:"method"`
		// Number of uniq keys, processed by this selector (may be incorrect, in case of internal query optimization/caching
		Keys int `json:"keys"`
		// Count of comparators used, for this selector
		Comparators int `json:"comparators"`
		// Cost expectation of this selector
		Cost float64 `json:"cost"`
		// Count of processed documents, matched this selector
		Matched int `json:"matched"`
		// Count of scanned documents by this selector
		Items int `json:"items"`
		// Preselect in joined namespace execution explainings
		ExplainPreselect *ExplainResults `json:"explain_preselect,omitempty"`
		// One of selects in joined namespace execution explainings
		ExplainSelect *ExplainResults `json:"explain_select,omitempty"`
	} `json:"selectors"`
}

ExplainResults presents query plan

type FtFastConfig 

type FtFastConfig struct {
	// boost of bm25 ranking. default value 1.
	Bm25Boost float64 `json:"bm25_boost"`
	// weight of bm25 rank in final rank.
	// 0: bm25 will not change final rank.
	// 1: bm25 will affect to final rank in 0 - 100% range
	Bm25Weight float64 `json:"bm25_weight"`
	// boost of search query term distance in found document. default vaule 1
	DistanceBoost float64 `json:"distance_boost"`
	// weight of search query terms distance in found document in final rank.
	// 0: distance will not change final rank.
	// 1: distance will affect to final rank in 0 - 100% range
	DistanceWeight float64 `json:"distance_weight"`
	// boost of search query term length. default value 1
	TermLenBoost float64 `json:"term_len_boost"`
	// weight of search query term length in final rank.
	// 0: term length will not change final rank.
	// 1: term length will affect to final rank in 0 - 100% range
	TermLenWeight float64 `json:"term_len_weight"`
	// boost of search query term position. default value 1
	PositionBoost float64 `json:"position_boost"`
	// weight of search query term position in final rank.
	// 0: term position will not change final rank.
	// 1: term position will affect to final rank in 0 - 100% range
	PositionWeight float64 `json:"position_weight"`
	// Boost of full match of search phrase with doc
	FullMatchBoost float64 `json:"full_match_boost"`
	// Minimum rank of found documents
	MinRelevancy float64 `json:"min_relevancy"`
	// Maximum possible typos in word.
	// 0: typos is disabled, words with typos will not match
	// N: words with N possible typos will match
	// It is not recommended to set more than 1 possible typo: It will serously increase RAM usage, and decrease search speed
	MaxTyposInWord int `json:"max_typos_in_word"`
	// Maximum word length for building and matching variants with typos. Default value is 15
	MaxTypoLen int `json:"max_typo_len"`
	// Maximum commit steps - set it 1 for always full rebuild - it can be from 1 to 500
	MaxRebuildSteps int `json:"max_rebuild_steps"`
	// Maximum words in one commit - it can be from 5 to DOUBLE_MAX
	MaxStepSize int `json:"max_step_size"`
	// Maximum documents which will be processed in merge query results
	// Default value is 20000. Increasing this value may refine ranking
	// of queries with high frequency words
	MergeLimit int `json:"merge_limit"`
	// List of used stemmers
	Stemmers []string `json:"stemmers"`
	// Enable translit variants processing
	EnableTranslit bool `json:"enable_translit"`
	// Enable wrong keyboard layout variants processing
	EnableKbLayout bool `json:"enable_kb_layout"`
	// List of stop words. Words from this list will be ignored in documents and queries
	StopWords []string `json:"stop_words"`
	// List of synonyms for replacement
	Synonyms []struct {
		// List source tokens in query, which will be replaced with alternatives
		Tokens []string `json:"tokens"`
		// List of alternatives, which will be used for search documents
		Alternatives []string `json:"alternatives"`
	} `json:"synonyms"`
	// Log level of full text search engine
	LogLevel int `json:"log_level"`
	// Enable search by numbers as words and backwards
	EnableNumbersSearch bool `json:"enable_numbers_search"`
	// Extra symbols, which will be threated as parts of word to addition to letters and digits
	ExtraWordSymbols string `json:"extra_word_symbols"`
}

FtFastConfig configurarion of FullText search index

func DefaultFtFastConfig 

func DefaultFtFastConfig() FtFastConfig

type FtFuzzyConfig 

type FtFuzzyConfig struct {
	// max proc geting from src reqest
	MaxSrcProc float64 `json:"max_src_proc"`
	// max proc geting from dst reqest
	//usualy maxDstProc = 100 -MaxSrcProc but it's not nessary
	MaxDstProc float64 `json:"max_dst_proc"`
	// increse proc when found pos that are near between  source and dst string (0.0001-2)
	PosSourceBoost float64 `json:"pos_source_boost"`
	// Minim coof for pos that are neaer in src and dst (0.0001-2)
	PosSourceDistMin float64 `json:"pos_source_dist_min"`
	// increse proc when found pos that are near in source string (0.0001-2)
	PosSourceDistBoost float64 `json:"pos_source_dist_boost"`
	// increse proc when found pos that are near in dst string (0.0001-2)
	PosDstBoost float64 `json:"pos_dst_boost"`
	// decrese proc when found  not full thregramm - only start and end (0.0001-2)
	StartDecreeseBoost float64 `json:"start_decreese_boost"`
	// base decrese proc when found  not full thregramm - only start and end (0.0001-2)
	StartDefaultDecreese float64 `json:"start_default_decreese"`
	// Min relevance to show reqest
	MinOkProc float64 `json:"min_ok_proc"`
	// size of gramm (1-10)- for example
	//terminator BufferSize=3 __t _te ter erm rmi ...
	//terminator BufferSize=4 __te _ter term ermi rmin
	BufferSize int `json:"buffer_size"`
	// size of space in start and end of gramm (0-9) - for example
	//terminator SpaceSize=2 __t _te ter   ... tor or_ r__
	//terminator SpaceSize=1 _te  ter  ... tor or_
	SpaceSize int `json:"space_size"`
	// Maximum documents which will be processed in merge query results
	// Default value is 20000. Increasing this value may refine ranking
	// of queries with high frequency words
	MergeLimit int `json:"merge_limit"`
	// List of used stemmers
	Stemmers []string `json:"stemmers"`
	// Enable translit variants processing
	EnableTranslit bool `json:"enable_translit"`
	// Enable wrong keyboard layout variants processing
	EnableKbLayout bool `json:"enable_kb_layout"`
	// List of stop words. Words from this list will be ignored in documents and queries
	StopWords []string `json:"stop_words"`
	// Log level of full text search engine
	LogLevel int `json:"log_level"`
	// Extra symbols, which will be threated as parts of word to addition to letters and digits
	ExtraWordSymbols string `json:"extra_word_symbols"`
}

FtFuzzyConfig configurarion of FuzzyFullText search index

func DefaultFtFuzzyConfig 

func DefaultFtFuzzyConfig() FtFuzzyConfig

type IndexDef 

type IndexDef bindings.IndexDef

IndexDef - Inddex definition struct

type IndexDescription 

type IndexDescription struct {
	IndexDef

	IsSortable bool     `json:"is_sortable"`
	IsFulltext bool     `json:"is_fulltext"`
	Conditions []string `json:"conditions"`
}

type Iterator 

type Iterator struct {
	// contains filtered or unexported fields
}

Iterator presents query results

func (*Iterator) AggResults 

func (it *Iterator) AggResults() (v []AggregationResult)

AggResults returns aggregation results (if present)

func (*Iterator) AllowUnsafe 

func (it *Iterator) AllowUnsafe(allow bool) *Iterator

AllowUnsafe takes bool, that enable or disable unsafe behavior.

When AllowUnsafe is true and object cache is enabled resulting objects will not be copied for each query. That means possible race conditions. But it's good speedup, without overhead for copying.

By default reindexer guarantees that every object its safe to use in multithread.

func (*Iterator) Close 

func (it *Iterator) Close()

Close closes the iterator and freed CGO resources

func (*Iterator) Count 

func (it *Iterator) Count() int

Count returns count if query results

func (*Iterator) Error 

func (it *Iterator) Error() error

Error returns query error if it's present.

func (*Iterator) FetchAll 

func (it *Iterator) FetchAll() (items []interface{}, err error)

FetchAll returns all query results as slice []interface{} and closes the iterator.

func (*Iterator) FetchAllWithRank 

func (it *Iterator) FetchAllWithRank() (items []interface{}, ranks []int, err error)

FetchAllWithRank returns resulting slice of objects and slice of objects ranks. Closes iterator after use.

func (*Iterator) FetchOne 

func (it *Iterator) FetchOne() (item interface{}, err error)

FetchOne returns first element and closes the iterator. When it's impossible (count is 0) err will be ErrNotFound.

func (*Iterator) GetAggreatedValue 

func (it *Iterator) GetAggreatedValue(idx int) float64

GetAggreatedValue - Return aggregation sum of field

func (*Iterator) GetExplainResults 

func (it *Iterator) GetExplainResults() (*ExplainResults, error)

GetExplainResults returns JSON bytes with explain results

func (*Iterator) HasRank 

func (it *Iterator) HasRank() bool

HasRank indicates if this iterator has info about search ranks.

func (*Iterator) JoinedObjects 

func (it *Iterator) JoinedObjects(field string) (objects []interface{}, err error)

JoinedObjects returns objects slice, that result of join for the given field

func (*Iterator) Next 

func (it *Iterator) Next() (hasNext bool)

func (*Iterator) NextObj 

func (it *Iterator) NextObj(obj interface{}) (hasNext bool)

Next moves iterator pointer to the next element. Returns bool, that indicates the availability of the next elements. Decode result to given struct

func (*Iterator) Object 

func (it *Iterator) Object() interface{}

Object returns current object. Will panic when pointer was not moved, Next() must be called before.

func (*Iterator) Rank 

func (it *Iterator) Rank() int

Rank returns current object search rank. Will panic when pointer was not moved, Next() must be called before.

func (*Iterator) TotalCount 

func (it *Iterator) TotalCount() int

TotalCount returns total count of objects (ignoring conditions of limit and offset)

type JSONIterator 

type JSONIterator struct {
	// contains filtered or unexported fields
}

JSONIterator its iterator, but results presents as json documents

func (*JSONIterator) Close 

func (it *JSONIterator) Close()

Close closes the iterator.

func (*JSONIterator) Count 

func (it *JSONIterator) Count() int

Count returns count if query results

func (*JSONIterator) Error 

func (it *JSONIterator) Error() error

Error returns query error if it's present.

func (*JSONIterator) FetchAll 

func (it *JSONIterator) FetchAll() (json []byte, err error)

FetchAll returns bytes slice it's JSON array with results

func (*JSONIterator) GetExplainResults 

func (it *JSONIterator) GetExplainResults() (*ExplainResults, error)

GetExplainResults returns JSON bytes with explain results

func (*JSONIterator) JSON 

func (it *JSONIterator) JSON() (json []byte)

JSON returns JSON bytes with current document

func (*JSONIterator) Next 

func (it *JSONIterator) Next() bool

Next moves iterator pointer to the next element. Returns bool, that indicates the availability of the next elements.

type JoinHandler 

type JoinHandler func(field string, item interface{}, subitems []interface{}) (useAutomaticJoinStrategy bool)

JoinHandler it's function for handle join results. Returns bool, that indicates whether automatic join strategy still needs to be applied. If `useAutomaticJoinStrategy` is false - it means that JoinHandler takes full responsibility of performing join. If `useAutomaticJoinStrategy` is true - it means JoinHandler will perform only part of the work, required during join, the rest will be done using automatic join strategy. Automatic join strategy is defined as: - use Join method to perform join (in case item implements Joinable interface) - use reflection to perform join otherwise

type Joinable 

type Joinable interface {
	Join(field string, subitems []interface{}, context interface{})
}

Joinable is an interface for append joined items

type Logger 

type Logger interface {
	Printf(level int, fmt string, msg ...interface{})
}

Logger interface for reindexer

type MasterReplicationState 

type MasterReplicationState struct {
	// Last Log Sequence Number (LSN) of applied namespace modification
	LastLSN int64 `json:"last_lsn"`
	// Hashsum of all records in namespace
	DataHash uint64 `json:"data_hash"`
	// Data updated timestamp
	UpdatedUnixNano int64 `json:"updated_unix_nano"`
	// Items count in master namespace
	DataCount int64 `json:"data_count"`
}

MasterReplicationState information about reindexer-master state

type NamespaceDescription 

type NamespaceDescription struct {
	Name           string             `json:"name"`
	Indexes        []IndexDescription `json:"indexes"`
	StorageEnabled bool               `json:"storage_enabled"`
}

type NamespaceMemStat 

type NamespaceMemStat struct {
	// Name of namespace
	Name string `json:"name"`
	// [[deperecated]]. do not use
	StorageError string `json:"storage_error"`
	// Filesystem path to namespace storage
	StoragePath string `json:"storage_path"`
	// Status of disk storage
	StorageOK bool `json:"storage_ok"`
	// Background indexes optimization has been completed
	OptimizationCompleted bool `json:"optimization_completed"`
	// Total count of documents in namespace
	ItemsCount int64 `json:"items_count,omitempty"`
	// Count of emopy(unused) slots in namespace
	EmptyItemsCount int64 `json:"empty_items_count"`
	// Raw size of documents, stored in the namespace, except string fields
	DataSize int64 `json:"data_size"`
	// Summary of total namespace memory consumption
	Total struct {
		// Total memory size of stored documents, including system structures
		DataSize int64 `json:"data_size"`
		// Total memory consumption of namespace's indexes
		IndexesSize int64 `json:"indexes_size"`
		// Total memory consumption of namespace's caches. e.g. idset and join caches
		CacheSize int64 `json:"cache_size"`
	} `json:"total"`
	// Replication status of namespace
	Replication struct {
		// Last Log Sequence Number (LSN) of applied namespace modification
		LastLSN int64 `json:"last_lsn"`
		// If true, then namespace is in slave mode
		SlaveMode bool `json:"slave_mode"`
		// Number of storage's master <-> slave switches
		IncarnationCounter int64 `json:"incarnation_counter"`
		// Hashsum of all records in namespace
		DataHash uint64 `json:"data_hash"`
		// Write Ahead Log (WAL) records count
		WalCount int64 `json:"wal_count"`
		// Total memory consumption of Write Ahead Log (WAL)
		WalSize int64 `json:"wal_size"`
		// Data updated timestamp
		UpdatedUnixNano int64 `json:"updated_unix_nano"`
		// Last replication error code
		ErrorCode int64 `json:"error_code"`
		// Last replication error message
		ErrorMessage string `json:"error_message"`
		// Master's state
		MasterState MasterReplicationState `json:"master_state"`
		// Current replication status
		Status string `json:"status"`
	} `json:"replication"`
	// Indexes memory statistic
	Indexes []struct {
		// Name of index. There are special index with name `-tuple`. It's stores original document's json structure with non indexe fields
		Name string `json:"name"`
		// Count of unique keys values stored in index
		UniqKeysCount int64 `json:"unique_keys_count"`
		// Total memory consumption of documents's data, holded by index
		DataSize int64 `json:"data_size"`
		// Total memory consumption of SORT statement and `GT`, `LT` conditions optimized structures. Applicabe only to `tree` indexes
		SortOrdresSize int64 `json:"sort_orders_size"`
		// Total memory consumption of reverse index vectors. For `store` ndexes always 0
		IDSetPlainSize int64 `json:"idset_plain_size"`
		// Total memory consumption of reverse index b-tree structures. For `dense` and `store` indexes always 0
		IDSetBTreeSize int64 `json:"idset_btree_size"`
		// Total memory consumption of fulltext search structures
		FulltextSize int64 `json:"fulltext_size"`
		// Idset cache stats. Stores merged reverse index results of SELECT field IN(...) by IN(...) keys
		IDSetCache CacheMemStat `json:"idset_cache"`
	} `json:"indexes"`
	// Join cache stats. Stores results of selects to right table by ON condition
	JoinCache CacheMemStat `json:"join_cache"`
	// Query cache stats. Stores results of SELECT COUNT(*) by Where conditions
	QueryCache CacheMemStat `json:"query_cache"`
}

NamespaceMemStat information about reindexer's namespace memory statisctics and located in '#memstats' system namespace

type NamespaceOptions 

type NamespaceOptions struct {
	// contains filtered or unexported fields
}

NamespaceOptions is options for namespace

func DefaultNamespaceOptions 

func DefaultNamespaceOptions() *NamespaceOptions

DefaultNamespaceOptions return defailt namespace options

func (*NamespaceOptions) DisableObjCache 

func (opts *NamespaceOptions) DisableObjCache() *NamespaceOptions

func (*NamespaceOptions) DropOnFileFormatError 

func (opts *NamespaceOptions) DropOnFileFormatError() *NamespaceOptions

func (*NamespaceOptions) DropOnIndexesConflict 

func (opts *NamespaceOptions) DropOnIndexesConflict() *NamespaceOptions

func (*NamespaceOptions) NoStorage 

func (opts *NamespaceOptions) NoStorage() *NamespaceOptions

type NamespacePerfStat 

type NamespacePerfStat struct {
	// Name of namespace
	Name string `json:"name"`
	// Performance statistics for update operations
	Updates PerfStat `json:"updates"`
	// Performance statistics for select operations
	Selects PerfStat `json:"selects"`
	// Performance statistics for transactions
	Transactions TxPerfStat `json:"transactions"`
}

NamespacePerfStat is information about namespace's performance statistics and located in '#perfstats' system namespace

type PerfStat 

type PerfStat struct {
	// Total count of queries to this object
	TotalQueriesCount int64 `json:"total_queries_count"`
	// Average latency (execution time) for queries to this object
	TotalAvgLatencyUs int64 `json:"total_avg_latency_us"`
	// Average waiting time for acquiring lock to this object
	TotalAvgLockTimeUs int64 `json:"total_avg_lock_time_us"`
	// Count of queries to this object, requested at last second
	LastSecQPS int64 `json:"last_sec_qps"`
	// Average latency (execution time) for queries to this object at last second
	LastSecAvgLatencyUs int64 `json:"last_sec_avg_latency_us"`
	// Average waiting time for acquiring lock to this object at last second
	LastSecAvgLockTimeUs int64 `json:"last_sec_avg_lock_time_us"`
	// Minimal latency value
	MinLatencyUs int64 `json:"min_latency_us"`
	// Maximum latency value
	MaxLatencyUs int64 `json:"max_latency_us"`
	// Standard deviation of latency values
	LatencyStddev int64 `json:"latency_stddev"`
}

PerfStat is information about different reinexer's objects performance statistics

type Query 

type Query struct {
	Namespace string
	// contains filtered or unexported fields
}

Query to DB object

func (*Query) AggregateAvg 

func (q *Query) AggregateAvg(field string)

func (*Query) AggregateFacet 

func (q *Query) AggregateFacet(fields ...string) *AggregateFacetRequest

fields should not be empty.

func (*Query) AggregateMax 

func (q *Query) AggregateMax(field string)

func (*Query) AggregateMin 

func (q *Query) AggregateMin(field string)

func (*Query) AggregateSum 

func (q *Query) AggregateSum(field string)

func (*Query) CachedTotal 

func (q *Query) CachedTotal(totalNames ...string) *Query

CachedTotal Request cached total items calculation

func (*Query) CloseBracket 

func (q *Query) CloseBracket() *Query

CloseBracket - Close bracket for where condition to DB query

func (*Query) Debug 

func (q *Query) Debug(level int) *Query

Debug - Set debug level

func (*Query) Delete 

func (q *Query) Delete() (int, error)

Delete will execute query, and delete items, matches query On sucess return number of deleted elements

func (*Query) DeleteCtx 

func (q *Query) DeleteCtx(ctx context.Context) (int, error)

DeleteCtx will execute query, and delete items, matches query On sucess return number of deleted elements

func (*Query) Distinct 

func (q *Query) Distinct(distinctIndex string) *Query

Distinct - Return only items with uniq value of field

func (*Query) Drop 

func (q *Query) Drop(field string) *Query

Drop removes field from item within Update statement

func (*Query) EqualPosition 

func (q *Query) EqualPosition(fields ...string) *Query

Adds equal position fields to arrays

func (*Query) Exec 

func (q *Query) Exec() *Iterator

Exec will execute query, and return slice of items

func (*Query) ExecCtx 

func (q *Query) ExecCtx(ctx context.Context) *Iterator

ExecCtx will execute query, and return slice of items

func (*Query) ExecToJson 

func (q *Query) ExecToJson(jsonRoots ...string) *JSONIterator

ExecToJson will execute query, and return iterator

func (*Query) ExecToJsonCtx 

func (q *Query) ExecToJsonCtx(ctx context.Context, jsonRoots ...string) *JSONIterator

ExecToJsonCtx will execute query, and return iterator

func (*Query) Explain 

func (q *Query) Explain() *Query

Explain - Request explain for query

func (*Query) FetchCount 

func (q *Query) FetchCount(n int) *Query

FetchCount sets the number of items that will be fetched by one operation When n <= 0 query will fetch all results in one operation

func (*Query) Functions 

func (q *Query) Functions(fields ...string) *Query

Select add filter to fields of result's objects

func (*Query) Get 

func (q *Query) Get() (item interface{}, found bool)

Get will execute query, and return 1 st item, panic on error

func (*Query) GetCtx 

func (q *Query) GetCtx(ctx context.Context) (item interface{}, found bool)

GetCtx will execute query, and return 1 st item, panic on error

func (*Query) GetJson 

func (q *Query) GetJson() (json []byte, found bool)

GetJson will execute query, and return 1 st item, panic on error

func (*Query) GetJsonCtx 

func (q *Query) GetJsonCtx(ctx context.Context) (json []byte, found bool)

GetJsonCtx will execute query, and return 1 st item, panic on error

func (*Query) InnerJoin 

func (q *Query) InnerJoin(q2 *Query, field string) *Query

InnerJoin joins 2 queries Items from the 1-st query are filtered by and expanded with the data from the 2-nd query

`field` parameter serves as unique identifier for the join between `q` and `q2` One of the conditions below must hold for `field` parameter in order for InnerJoin to work: - namespace of `q2` contains `field` as one of its fields marked as `joined` - `q` has a join handler (registered via `q.JoinHandler(...)` call) with the same `field` value

func (*Query) Join 

func (q *Query) Join(q2 *Query, field string) *Query

Join is an alias for LeftJoin

func (*Query) JoinHandler 

func (q *Query) JoinHandler(field string, handler JoinHandler) *Query

JoinHandler registers join handler that will be called when join, registered on `field` value, finds a match

func (*Query) LeftJoin 

func (q *Query) LeftJoin(q2 *Query, field string) *Query

LeftJoin joins 2 queries Items from the 1-st query are expanded with the data from the 2-nd query

`field` parameter serves as unique identifier for the join between `q` and `q2` One of the conditions below must hold for `field` parameter in order for LeftJoin to work: - namespace of `q2` contains `field` as one of its fields marked as `joined` - `q` has a join handler (registered via `q.JoinHandler(...)` call) with the same `field` value

func (*Query) Limit 

func (q *Query) Limit(limitItems int) *Query

Limit - Set limit (count) of returned items

func (*Query) MakeCopy 

func (q *Query) MakeCopy(db *Reindexer) *Query

MakeCopy - copy of query with same or other db, resets query context

func (*Query) Match 

func (q *Query) Match(index string, keys ...string) *Query

WhereString - Add where condition to DB query with string args

func (*Query) Merge 

func (q *Query) Merge(q2 *Query) *Query

Merge 2 queries

func (*Query) MustExec 

func (q *Query) MustExec() *Iterator

MustExec will execute query, and return iterator, panic on error

func (*Query) MustExecCtx 

func (q *Query) MustExecCtx(ctx context.Context) *Iterator

MustExecCtx will execute query, and return iterator, panic on error

func (*Query) Not 

func (q *Query) Not() *Query

Not - next condition will added with NOT AND Implements short-circuiting: if the previous condition is failed the next will not be evaluated

func (*Query) Offset 

func (q *Query) Offset(startOffset int) *Query

Offset - Set start offset of returned items

func (*Query) On 

func (q *Query) On(index string, condition int, joinIndex string) *Query

On specifies join condition

`index` parameter specifies which field from `q` namespace should be used during join `condition` parameter specifies how `q` will be joined with the latest join query issued on `q` (e.g. `EQ`/`GT`/`SET`/...) `joinIndex` parameter specifies which field from namespace for the latest join query issued on `q` should be used during join

func (*Query) OpenBracket 

func (q *Query) OpenBracket() *Query

OpenBracket - Open bracket for where condition to DB query

func (*Query) Or 

func (q *Query) Or() *Query

OR - next condition will added with OR Implements short-circuiting: if the previous condition is successful the next will not be evaluated, but except Join conditions

func (*Query) ReqTotal 

func (q *Query) ReqTotal(totalNames ...string) *Query

ReqTotal Request total items calculation

func (*Query) Select 

func (q *Query) Select(fields ...string) *Query

Select add filter to fields of result's objects

func (*Query) Set 

func (q *Query) Set(field string, values interface{}) *Query

Set adds update field request for update query

func (*Query) SetContext 

func (q *Query) SetContext(ctx interface{}) *Query

SetContext set interface, which will be passed to Joined interface

func (*Query) SetExpression 

func (q *Query) SetExpression(field string, value string) *Query

SetExpression updates indexed field by arithmetical expression

func (*Query) SetObject 

func (q *Query) SetObject(field string, values interface{}) *Query

SetObject adds update of object field request for update query

func (*Query) Sort 

func (q *Query) Sort(sortIndex string, desc bool, values ...interface{}) *Query

Sort - Apply sort order to returned from query items If values argument specified, then items equal to values, if found will be placed in the top positions For composite indexes values must be []interface{}, with value of each subindex

func (*Query) Update 

func (q *Query) Update() *Iterator

Update will execute query, and update fields in items, which matches query On sucess return number of update elements

func (*Query) UpdateCtx 

func (q *Query) UpdateCtx(ctx context.Context) *Iterator

UpdateCtx will execute query, and update fields in items, which matches query On sucess return number of update elements

func (*Query) Where 

func (q *Query) Where(index string, condition int, keys interface{}) *Query

Where - Add where condition to DB query For composite indexes keys must be []interface{}, with value of each subindex

func (*Query) WhereBool 

func (q *Query) WhereBool(index string, condition int, keys ...bool) *Query

WhereString - Add where condition to DB query with bool args

func (*Query) WhereComposite 

func (q *Query) WhereComposite(index string, condition int, keys ...interface{}) *Query

WhereComposite - Add where condition to DB query with interface args for composite indexes

func (*Query) WhereDouble 

func (q *Query) WhereDouble(index string, condition int, keys ...float64) *Query

WhereDouble - Add where condition to DB query with float args

func (*Query) WhereInt 

func (q *Query) WhereInt(index string, condition int, keys ...int) *Query

WhereInt - Add where condition to DB query with int args

func (*Query) WhereInt32 

func (q *Query) WhereInt32(index string, condition int, keys ...int32) *Query

WhereInt - Add where condition to DB query with int args

func (*Query) WhereInt64 

func (q *Query) WhereInt64(index string, condition int, keys ...int64) *Query

WhereInt64 - Add where condition to DB query with int64 args

func (*Query) WhereString 

func (q *Query) WhereString(index string, condition int, keys ...string) *Query

WhereString - Add where condition to DB query with string args

func (*Query) WithRank 

func (q *Query) WithRank() *Query

Output fulltext rank Allowed only with fulltext query

type QueryPerfStat 

type QueryPerfStat struct {
	Query string `json:"query"`
	PerfStat
}

QueryPerfStat is information about query's performance statistics and located in '#queriesperfstats' system namespace

type Reindexer 

type Reindexer struct {
	// contains filtered or unexported fields
}

Reindexer The reindxer state struct

func NewReindex 

func NewReindex(dsn interface{}, options ...interface{}) *Reindexer

NewReindex Create new instanse of Reindexer DB Returns pointer to created instance

func (*Reindexer) AddIndex 

func (db *Reindexer) AddIndex(namespace string, indexDef ...IndexDef) error

AddIndex - add index.

func (*Reindexer) BeginTx 

func (db *Reindexer) BeginTx(namespace string) (*Tx, error)

func (*Reindexer) Close 

func (db *Reindexer) Close()

func (*Reindexer) CloseNamespace 

func (db *Reindexer) CloseNamespace(namespace string) error

CloseNamespace - close namespace, but keep storage

func (*Reindexer) ConfigureIndex 

func (db *Reindexer) ConfigureIndex(namespace, index string, config interface{}) error

ConfigureIndex - congigure index. config argument must be struct with index configuration Deprecated: Use UpdateIndex instead.

func (*Reindexer) Delete 

func (db *Reindexer) Delete(namespace string, item interface{}, precepts ...string) error

Delete - remove single item from namespace by PK Item must be the same type as item passed to OpenNamespace, or []byte with json data If the precepts are provided and the item is a pointer, the value pointed by item will be updated

func (*Reindexer) DescribeNamespace 

func (db *Reindexer) DescribeNamespace(namespace string) (*NamespaceDescription, error)

DescribeNamespace makes a 'SELECT * FROM #namespaces' query to database. Return NamespaceDescription results, error

func (*Reindexer) DescribeNamespaces 

func (db *Reindexer) DescribeNamespaces() ([]*NamespaceDescription, error)

DescribeNamespaces makes a 'SELECT * FROM #namespaces' query to database. Return NamespaceDescription results, error

func (*Reindexer) DropIndex 

func (db *Reindexer) DropIndex(namespace, index string) error

DropIndex - drop index.

func (*Reindexer) DropNamespace 

func (db *Reindexer) DropNamespace(namespace string) error

DropNamespace - drop whole namespace from DB

func (*Reindexer) EnableStorage 

func (db *Reindexer) EnableStorage(storagePath string) error

EnableStorage enables persistent storage of data Deprecated: storage path should be passed as DSN part to reindexer.NewReindex (""), e.g. reindexer.NewReindexer ("builtin:///tmp/reindex").

func (*Reindexer) ExecSQL 

func (db *Reindexer) ExecSQL(query string) *Iterator

ExecSQL make query to database. Query is a SQL statement. Return Iterator.

func (*Reindexer) ExecSQLToJSON 

func (db *Reindexer) ExecSQLToJSON(query string) *JSONIterator

ExecSQLToJSON make query to database. Query is a SQL statement. Return JSONIterator.

func (*Reindexer) GetMeta 

func (db *Reindexer) GetMeta(namespace, key string) ([]byte, error)

func (*Reindexer) GetNamespaceMemStat 

func (db *Reindexer) GetNamespaceMemStat(namespace string) (*NamespaceMemStat, error)

GetNamespaceMemStat makes a 'SELECT * FROM #memstat' query to database. Return NamespaceMemStat results, error

func (*Reindexer) GetNamespacesMemStat 

func (db *Reindexer) GetNamespacesMemStat() ([]*NamespaceMemStat, error)

GetNamespacesMemStat makes a 'SELECT * FROM #memstats' query to database. Return NamespaceMemStat results, error

func (*Reindexer) GetStats 

func (db *Reindexer) GetStats() bindings.Stats

GetStats Get local thread reindexer usage stats Deprecated: Use SELECT * FROM '#perfstats' to get performance statistics.

func (*Reindexer) Insert 

func (db *Reindexer) Insert(namespace string, item interface{}, precepts ...string) (int, error)

Insert item to namespace by PK Item must be the same type as item passed to OpenNamespace, or []byte with json data Return 0, if no item was inserted, 1 if item was inserted If the precepts are provided and the item is a pointer, the value pointed by item will be updated

func (*Reindexer) MustBeginTx 

func (db *Reindexer) MustBeginTx(namespace string) *Tx

MustBeginTx - start update transaction, panic on error

func (*Reindexer) OpenNamespace 

func (db *Reindexer) OpenNamespace(namespace string, opts *NamespaceOptions, s interface{}) (err error)

OpenNamespace Open or create new namespace and indexes based on passed struct. IndexDef fields of struct are marked by `reindex:` tag

func (*Reindexer) Ping 

func (db *Reindexer) Ping() error

Ping checks connection with reindexer

func (*Reindexer) PutMeta 

func (db *Reindexer) PutMeta(namespace, key string, data []byte) error

func (*Reindexer) Query 

func (db *Reindexer) Query(namespace string) *Query

Query Create new Query for building request

func (*Reindexer) QueryFrom 

func (db *Reindexer) QueryFrom(d dsl.DSL) (*Query, error)

QueryFrom - create query from DSL and execute it

func (*Reindexer) RegisterNamespace 

func (db *Reindexer) RegisterNamespace(namespace string, opts *NamespaceOptions, s interface{}) (err error)

RegisterNamespace Register go type against namespace. There are no data and indexes changes will be performed

func (*Reindexer) RenameNamespace 

func (db *Reindexer) RenameNamespace(srcNsName string, dstNsName string) error

RenameNamespace - Rename namespace. If namespace with dstNsName exists, then it is replaced.

func (*Reindexer) RenameNs 

func (db *Reindexer) RenameNs(srcNsName string, dstNsName string)

func (*Reindexer) ReopenLogFiles 

func (db *Reindexer) ReopenLogFiles() error

ReopenLogFiles reopens log files

func (*Reindexer) ResetCaches 

func (db *Reindexer) ResetCaches()

func (*Reindexer) ResetStats 

func (db *Reindexer) ResetStats()

ResetStats Reset local thread reindexer usage stats Deprecated: no longer used.

func (*Reindexer) SetDefaultQueryDebug 

func (db *Reindexer) SetDefaultQueryDebug(namespace string, level int) error

SetDefaultQueryDebug sets default debug level for queries to namespaces

func (*Reindexer) SetLogger 

func (db *Reindexer) SetLogger(log Logger)

SetLogger sets logger interface for output reindexer logs

func (*Reindexer) Status 

func (db *Reindexer) Status() bindings.Status

Status will return current db status

func (*Reindexer) TruncateNamespace 

func (db *Reindexer) TruncateNamespace(namespace string) error

TruncateNamespace - delete all items from namespace

func (*Reindexer) Update 

func (db *Reindexer) Update(namespace string, item interface{}, precepts ...string) (int, error)

Update item to namespace by PK Item must be the same type as item passed to OpenNamespace, or []byte with json data Return 0, if no item was updated, 1 if item was updated If the precepts are provided and the item is a pointer, the value pointed by item will be updated

func (*Reindexer) UpdateIndex 

func (db *Reindexer) UpdateIndex(namespace string, indexDef IndexDef) error

UpdateIndex - update index.

func (*Reindexer) Upsert 

func (db *Reindexer) Upsert(namespace string, item interface{}, precepts ...string) error

Upsert (Insert or Update) item to index Item must be the same type as item passed to OpenNamespace, or []byte with json If the precepts are provided and the item is a pointer, the value pointed by item will be updated

func (*Reindexer) WithContext 

func (db *Reindexer) WithContext(ctx context.Context) *Reindexer

WithContext Add context to next method call

type Tx 

type Tx struct {
	// contains filtered or unexported fields
}

Tx is transaction object. Transaction are performs atomic namespace update. There are synchronous and async transaction available. To start transaction method `db.BeginTx()` is used. This method creates transaction object

func (*Tx) AwaitResults 

func (tx *Tx) AwaitResults() *Tx

AwaitResults awaits async requests completion

func (*Tx) Commit 

func (tx *Tx) Commit() error

Commit - apply changes. Commit also waits for all async operations done, and then apply changes. if any error occurred during prepare process, then tx.Commit should return an error. So it is enough, to check error returned by Commit - to be sure that all data has been successfully committed or not.

func (*Tx) CommitWithCount 

func (tx *Tx) CommitWithCount() (count int, err error)

CommitWithCount apply changes, and return count of changed items

func (*Tx) Delete 

func (tx *Tx) Delete(item interface{}, precepts ...string) error

Delete - remove item by id from namespace

func (*Tx) DeleteAsync 

func (tx *Tx) DeleteAsync(item interface{}, cmpl bindings.Completion, precepts ...string) error

DeleteAsync - remove item by id from namespace. Calls completion on result

func (*Tx) DeleteJSON 

func (tx *Tx) DeleteJSON(json []byte, precepts ...string) error

DeleteJSON - remove item by id from namespace

func (*Tx) DeleteJSONAsync 

func (tx *Tx) DeleteJSONAsync(json []byte, cmpl bindings.Completion, precepts ...string) error

DeleteJSONAsync - remove item by id from namespace. Calls completion on result

func (*Tx) Insert 

func (tx *Tx) Insert(item interface{}, precepts ...string) error

func (*Tx) InsertAsync 

func (tx *Tx) InsertAsync(item interface{}, cmpl bindings.Completion, precepts ...string) error

UpdateAsync Insert item to namespace. Calls completion on result

func (*Tx) MustCommit 

func (tx *Tx) MustCommit() int

MustCommit apply changes and starts panic on errors

func (*Tx) Query 

func (tx *Tx) Query() *Query

func (*Tx) Rollback 

func (tx *Tx) Rollback() error

func (*Tx) Update 

func (tx *Tx) Update(item interface{}, precepts ...string) error

func (*Tx) UpdateAsync 

func (tx *Tx) UpdateAsync(item interface{}, cmpl bindings.Completion, precepts ...string) error

UpdateAsync Update item to namespace. Calls completion on result

func (*Tx) Upsert 

func (tx *Tx) Upsert(item interface{}, precepts ...string) error

Upsert (Insert or Update) item to namespace

func (*Tx) UpsertAsync 

func (tx *Tx) UpsertAsync(item interface{}, cmpl bindings.Completion, precepts ...string) error

UpsertAsync (Insert or Update) item to namespace. Calls completion on result

func (*Tx) UpsertJSON 

func (tx *Tx) UpsertJSON(json []byte, precepts ...string) error

UpsertJSON (Insert or Update) item to namespace

func (*Tx) UpsertJSONAsync 

func (tx *Tx) UpsertJSONAsync(json []byte, cmpl bindings.Completion, precepts ...string) error

UpsertJSONAsync (Insert or Update) item to index. Calls completion on result

type TxPerfStat 

type TxPerfStat struct {
	// Total transactions count for namespace
	TotalCount int64 `json:"total_count"`
	// Total namespace copy operations
	TotalCopyCount int64 `json:"total_copy_count"`
	// Average steps count in transactions for this namespace
	AvgStepsCount int64 `json:"avg_steps_count"`
	// Minimum steps count in transactions for this namespace
	MinStepsCount int64 `json:"min_steps_count"`
	// Maximum steps count in transactions for this namespace
	MaxStepsCount int64 `json:"max_steps_count"`
	// Average transaction preparation time usec
	AvgPrepareTimeUs int64 `json:"avg_prepare_time_us"`
	// Minimum transaction preparation time usec
	MinPrepareTimeUs int64 `json:"min_prepare_time_us"`
	// Maximum transaction preparation time usec
	MaxPrepareTimeUs int64 `json:"max_prepare_time_us"`
	// Average transaction commit time usec
	AvgCommitTimeUs int64 `json:"avg_commit_time_us"`
	// Minimum transaction commit time usec
	MinCommitTimeUs int64 `json:"min_commit_time_us"`
	// Maximum transaction commit time usec
	MaxCommitTimeUs int64 `json:"max_commit_time_us"`
	// Average namespace copy time usec
	AvgCopyTimeUs int64 `json:"avg_copy_time_us"`
	// Maximum namespace copy time usec
	MinCopyTimeUs int64 `json:"min_copy_time_us"`
	// Minimum namespace copy time usec
	MaxCopyTimeUs int64 `json:"max_copy_time_us"`
}

TxPerfStat is information about transactions performance statistics

Source Files

View all Source files

Directories

Path Synopsis
repo
builtin
builtinserver
builtinserver/config
cproto
test
compatibility_test
custom_struct_another
ft
helpers

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