adapters

package
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 Go to latest Published: Jul 9, 2020 License: Apache-2.0 Imports: 7 Imported by: 1

README

Vent Adapters

Vent adapters are relational dbms that can be used to store event & log data.

Supported adapters:

  • PostgreSQL v9 (and above) is fully supported.
  • SQLite v3 (and above) is fully supported.

Considerations for adding new adapters:

Each adapter must be in a separate file with the name <dbms>_adapter.go and must implement given interface methods described in db_adapter.go.

This is all that is needed to add a new rdbms adapter, in addition to importing proper database driver.

Provided implementations are included in postgres_adapter.go and sqlite_adapter.go.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Cleanf 

func Cleanf(format string, args ...interface{}) string

Types

type DBAdapter 

type DBAdapter interface {
	Open(dbURL string) (*sqlx.DB, error)
	// TODO: incrementally refactor DBAdapter to be responsible for actually _doing_ the queries,
	// TODO: legacy stringly queries:
	// TypeMapping maps generic SQL column types to db adapter dependent column types
	TypeMapping(sqlColumnType types.SQLColumnType) (string, error)
	// ErrorEquals compares generic SQL errors to db adapter dependent errors
	ErrorEquals(err error, sqlErrorType types.SQLErrorType) bool
	// SecureColumnName returns columns with proper delimiters to ensure well formed column names
	SecureName(name string) string
	// CreateTableQuery builds a CREATE TABLE query to create a new table
	CreateTableQuery(tableName string, columns []*types.SQLTableColumn) (string, string)
	// FindTableQuery builds a SELECT query to check if a table exists
	FindTableQuery() string
	// TableDefinitionQuery builds a SELECT query to get a table structure from the Dictionary table
	TableDefinitionQuery() string
	// AlterColumnQuery builds an ALTER COLUMN query to alter a table structure (only adding columns is supported)
	AlterColumnQuery(tableName, columnName string, sqlColumnType types.SQLColumnType, length, order int) (string, string)
	// SelectRowQuery builds a SELECT query to get row values
	SelectRowQuery(tableName, fields, indexValue string) string
	// SelectLogQuery builds a SELECT query to get all tables involved in a given block transaction
	SelectLogQuery() string
	// InsertLogQuery builds an INSERT query to store data in Log table
	InsertLogQuery() string
	// UpsertQuery builds an INSERT... ON CONFLICT (or similar) query to upsert data in event tables based on PK
	UpsertQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, interface{}, error)
	// DeleteQuery builds a DELETE FROM event tables query based on PK
	DeleteQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, error)
	// RestoreDBQuery builds a list of sql clauses needed to restore the db to a point in time
	RestoreDBQuery() string
	// CleanDBQueries returns necessary queries to clean the database
	CleanDBQueries() types.SQLCleanDBQuery
	// DropTableQuery builds a DROP TABLE query to delete a table
	DropTableQuery(tableName string) string
	// Get the schema qualified name of the given table
	SchemaName(tableName string) string
}

DBAdapter implements database dependent interface

type DBNotifyTriggerAdapter 

type DBNotifyTriggerAdapter interface {
	// Create a SQL function that notifies on channel with the payload of columns - the payload containing the value
	// of each column will be sent once whenever any of the columns changes. Expected to replace existing function.
	CreateNotifyFunctionQuery(function, channel string, columns ...string) string
	// Create a trigger that fires the named function after any operation on a row in table. Expected to replace existing
	// trigger.
	CreateTriggerQuery(triggerName, tableName, functionName string) string
}

type PostgresAdapter 

type PostgresAdapter struct {
	Schema string
	types.SQLNames
	Log *logging.Logger
}

PostgresAdapter implements DBAdapter for Postgres

func NewPostgresAdapter 

func NewPostgresAdapter(schema string, sqlNames types.SQLNames, log *logging.Logger) *PostgresAdapter

NewPostgresAdapter constructs a new db adapter

func (*PostgresAdapter) AlterColumnQuery 

func (pa *PostgresAdapter) AlterColumnQuery(tableName, columnName string, sqlColumnType types.SQLColumnType, length, order int) (string, string)

AlterColumnQuery returns a query for adding a new column to a table

func (*PostgresAdapter) CleanDBQueries 

func (pa *PostgresAdapter) CleanDBQueries() types.SQLCleanDBQuery

func (*PostgresAdapter) CreateNotifyFunctionQuery 

func (pa *PostgresAdapter) CreateNotifyFunctionQuery(function, channel string, columns ...string) string

func (*PostgresAdapter) CreateTableQuery 

func (pa *PostgresAdapter) CreateTableQuery(tableName string, columns []*types.SQLTableColumn) (string, string)

CreateTableQuery builds query for creating a new table

func (*PostgresAdapter) CreateTriggerQuery 

func (pa *PostgresAdapter) CreateTriggerQuery(triggerName, tableName, functionName string) string

func (*PostgresAdapter) DeleteQuery 

func (pa *PostgresAdapter) DeleteQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, error)

func (*PostgresAdapter) DropTableQuery 

func (pa *PostgresAdapter) DropTableQuery(tableName string) string

func (*PostgresAdapter) ErrorEquals 

func (pa *PostgresAdapter) ErrorEquals(err error, sqlErrorType types.SQLErrorType) bool

ErrorEquals verify if an error is of a given SQL type

func (*PostgresAdapter) FindTableQuery 

func (pa *PostgresAdapter) FindTableQuery() string

FindTableQuery returns a query that checks if a table exists

func (*PostgresAdapter) InsertLogQuery 

func (pa *PostgresAdapter) InsertLogQuery() string

InsertLogQuery returns a query to insert a row in log table

func (*PostgresAdapter) Open 

func (pa *PostgresAdapter) Open(dbURL string) (*sqlx.DB, error)

func (*PostgresAdapter) RestoreDBQuery 

func (pa *PostgresAdapter) RestoreDBQuery() string

func (*PostgresAdapter) SchemaName added in v0.26.0 

func (pa *PostgresAdapter) SchemaName(tableName string) string

func (*PostgresAdapter) SecureName 

func (pa *PostgresAdapter) SecureName(name string) string

SecureColumnName return columns between appropriate security containers

func (*PostgresAdapter) SelectLogQuery 

func (pa *PostgresAdapter) SelectLogQuery() string

SelectLogQuery returns a query for selecting all tables involved in a block trn

func (*PostgresAdapter) SelectRowQuery 

func (pa *PostgresAdapter) SelectRowQuery(tableName, fields, indexValue string) string

SelectRowQuery returns a query for selecting row values

func (*PostgresAdapter) TableDefinitionQuery 

func (pa *PostgresAdapter) TableDefinitionQuery() string

TableDefinitionQuery returns a query with table structure

func (*PostgresAdapter) TypeMapping 

func (pa *PostgresAdapter) TypeMapping(sqlColumnType types.SQLColumnType) (string, error)

TypeMapping convert generic dataTypes to database dependent dataTypes

func (*PostgresAdapter) UpsertQuery 

func (pa *PostgresAdapter) UpsertQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, interface{}, error)

type SQLiteAdapter 

type SQLiteAdapter struct {
	Log *logging.Logger
}

This is a no-op version of SQLiteAdapter

func NewSQLiteAdapter 

func NewSQLiteAdapter(names types.SQLNames, log *logging.Logger) *SQLiteAdapter

func (*SQLiteAdapter) AlterColumnQuery 

func (*SQLiteAdapter) AlterColumnQuery(tableName, columnName string, sqlColumnType types.SQLColumnType, length, order int) (string, string)

func (*SQLiteAdapter) CleanDBQueries 

func (*SQLiteAdapter) CleanDBQueries() types.SQLCleanDBQuery

func (*SQLiteAdapter) CreateTableQuery 

func (*SQLiteAdapter) CreateTableQuery(tableName string, columns []*types.SQLTableColumn) (string, string)

func (*SQLiteAdapter) DeleteQuery 

func (*SQLiteAdapter) DeleteQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, error)

func (*SQLiteAdapter) DropTableQuery 

func (*SQLiteAdapter) DropTableQuery(tableName string) string

func (*SQLiteAdapter) ErrorEquals 

func (*SQLiteAdapter) ErrorEquals(err error, sqlErrorType types.SQLErrorType) bool

func (*SQLiteAdapter) FindTableQuery 

func (*SQLiteAdapter) FindTableQuery() string

func (*SQLiteAdapter) InsertLogQuery 

func (*SQLiteAdapter) InsertLogQuery() string

func (*SQLiteAdapter) Open 

func (*SQLiteAdapter) Open(dbURL string) (*sqlx.DB, error)

func (*SQLiteAdapter) RestoreDBQuery 

func (*SQLiteAdapter) RestoreDBQuery() string

func (*SQLiteAdapter) SchemaName added in v0.26.0 

func (*SQLiteAdapter) SchemaName(tableName string) string

func (*SQLiteAdapter) SecureName 

func (*SQLiteAdapter) SecureName(name string) string

func (*SQLiteAdapter) SelectLogQuery 

func (*SQLiteAdapter) SelectLogQuery() string

func (*SQLiteAdapter) SelectRowQuery 

func (*SQLiteAdapter) SelectRowQuery(tableName, fields, indexValue string) string

func (*SQLiteAdapter) TableDefinitionQuery 

func (*SQLiteAdapter) TableDefinitionQuery() string

func (*SQLiteAdapter) TypeMapping 

func (*SQLiteAdapter) TypeMapping(sqlColumnType types.SQLColumnType) (string, error)

func (*SQLiteAdapter) UpsertQuery 

func (*SQLiteAdapter) UpsertQuery(table *types.SQLTable, row types.EventDataRow) (types.UpsertDeleteQuery, interface{}, error)

Source Files

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