asc

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Version: v0.5.0 Latest Latest
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Published: Apr 20, 2019 License: Apache-2.0 Imports: 19 Imported by: 9

README

Datastore Connectivity for Aerospike (asc)

Datastore Connectivity library for Aerospike in Go. GoDoc

This library is compatible with Go 1.11+

Please refer to CHANGELOG.md if you encounter breaking changes.

Configuration parameters
aerospike client/policy config params
  • timeoutMs
  • connectionTimeout
  • serverSocketTimeout
  • scanPct
  • host
  • port
  • namespace
  • sleepBetweenRetries
  • batchSize
keyColumn, keyColumnName

Defines name of column used as record key ('id' by default)

It can be specified per table i.e

events.keyColumn = code
excludedColumns

List of columns to be excluded from record (i.e: id - in case we need it only as record key)

dateFormat

ISO date format used to time.Time conversion

optimizeLargeScan

Experimental feature that first scan all keys and write then to disk and then separate go routines scan data using the dumped keys

You can only specify scanBaseDirectory

Usage:

The following is a very simple example of CRUD operations with dsc

config.yaml

driverName: aerospike
parameters:
  namespace: test
  host: 127.0.0.1
  dateFormat: yyyy-MM-dd hh:mm:ss
package main

import (
    _ "github.com/aerospike/aerospike-client-go"
    _ "github.com/viant/asc"
    "github.com/viant/dsc"
    "log"
)


type Interest struct {
	Id int	`autoincrement:"true"`
	Name string
	ExpiryTimeInSecond int `column:"expiry"`
	Category string
}


func main() {


	config, err := dsc.NewConfigFromURL("config.yaml")
	if err != nil {
		log.Fatal(err)
	}
	factory := dsc.NewManagerFactory()
	manager, err := factory.Create(config)
	if err != nil {
		log.Fatal(err)
	}



  	// manager := factory.CreateFromURL("file:///etc/myapp/datastore.json")
  
    interest := &Interest{}
    
    success, err:= manager.ReadSingle(interest, "SELECT id, name, expiry, category FROM interests WHERE id = ?", []interface{}{id},nil)
	if err != nil {
        panic(err.Error())
	}

    var intersts = make([]*Interest, 0)
    err = manager.ReadAll(&intersts, "SELECT id, name, expiry, category FROM interests", nil ,nil)
    if err != nil {
        panic(err.Error())
    }

    
    intersts = []*Interest {
        Interest{Name:"Abc", ExpiryTimeInSecond:3600, Category:"xyz"},
        Interest{Name:"Def", ExpiryTimeInSecond:3600, Category:"xyz"},
        Interest{Id:"20, Name:"Ghi", ExpiryTimeInSecond:3600, Category:"xyz"},
    }


	_, _, err = manager.PersistAll(&intersts, "intersts", nil)
	if err != nil {
        panic(err.Error())
   	}
   	fmt.Printf("Inserted %v, updated: %v\n", inserted, updated)
  
    deleted, err := manager.DeleteAll(&intersts, "intersts", nil)
    if err != nil {
        panic(err.Error())
   	}
 	fmt.Printf("Inserted %v, updated: %v\n", deleted)


 	
 	var records = []map[string]interface{}{}
 	 err = manager.ReadAll(&records, "SELECT id, name, expiry, category FROM interests", nil ,nil)
    if err != nil {
        panic(err.Error())
    }
}
Query level UDF support
  • ARRAY converts supplied source column into collection of map entry defined as (key, value)
SELECT 
  id, 
  username, 
ARRAY(city_visited) AS visited
FROM users
  • JSON convert supplied source column to JSON
SELECT 
  id, 
  username, 
JSON(city_visited) AS visited
FROM users

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License

The source code is made available under the terms of the Apache License, Version 2, as stated in the file LICENSE.

Individual files may be made available under their own specific license, all compatible with Apache License, Version 2. Please see individual files for details.

Credits and Acknowledgements

Library Author: Adrian Witas

Contributors:

Documentation

Index

Constants

View Source
const (
	DateFormatKey = "dateFormat"
	DateLayoutKey = "dateLayout"
)

Variables

This section is empty.

Functions

func AsArray added in v0.2.0

func AsArray(source interface{}, state data.Map) (interface{}, error)

func AsJSON added in v0.2.0

func AsJSON(source interface{}, state data.Map) (interface{}, error)

func AsTimestamp added in v0.2.0

func AsTimestamp(config *dsc.Config) func(source interface{}, state data.Map) (interface{}, error)

func ReadKey

func ReadKey(reader io.Reader, namespace, setName string) (*aerospike.Key, int, error)

func WriteKey

func WriteKey(key *aerospike.Key, writer io.Writer) (err error)

Types

type Batch

type Batch struct {
	Keys    []*aerospike.Key
	Records []*aerospike.Record
}

type BatchIterator

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

BatchIterator represents a helper iterator for full scan, in this case keys were scanned first from each node separately to be used by this batch iterator, after keys files are fully process they will be removed.

func NewBatchIterator

func NewBatchIterator(client *aerospike.Client, batchPolicy *aerospike.BatchPolicy, batchSize int, namespace, table string, fileNames []string, binNames ...string) *BatchIterator

func (*BatchIterator) HasNext

func (i *BatchIterator) HasNext() bool

HasNext check is has more record, if needed it will scan keys from files to batch corresponding records

func (*BatchIterator) Next

func (i *BatchIterator) Next(target interface{}) error

type KeyScanner

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

func NewKeyScanner

func NewKeyScanner(client *aerospike.Client, scanPolicy *aerospike.ScanPolicy, baseDirectory, namespace, dataSet string) *KeyScanner

func (*KeyScanner) Scan

func (s *KeyScanner) Scan() ([]string, error)

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