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53 lines
1.9 KiB
Go
53 lines
1.9 KiB
Go
package driver
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import (
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"context"
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"database/sql"
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"github.com/neilotoole/sq/libsq/source"
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"github.com/neilotoole/sq/libsq/source/metadata"
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)
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// Grip is the link between a source and its database connection.
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// Why is it named Grip? TLDR: all the other names were taken,
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// including Handle, Conn, DB, Source, etc.
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//
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// Grip is conceptually equivalent to stdlib sql.DB, and in fact
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// encapsulates a sql.DB instance. The realized sql.DB instance can be
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// accessed via the DB method.
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type Grip interface {
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// DB returns the sql.DB object for this Grip. This operation some time
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// to complete if opening the DB requires an ingest of data.
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DB(ctx context.Context) (*sql.DB, error)
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// SQLDriver returns the underlying database driver. The type of the SQLDriver
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// may be different from the driver type reported by the Source.
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SQLDriver() SQLDriver
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// TODO: Append a method: SourceDriver() Driver.
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// Source returns the source for which this Grip was opened.
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Source() *source.Source
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// SourceMetadata returns metadata about the Grip.
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// If noSchema is true, schema details are not populated
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// on the returned metadata.Source.
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SourceMetadata(ctx context.Context, noSchema bool) (*metadata.Source, error)
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// TableMetadata returns metadata for the specified table in the Grip.
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TableMetadata(ctx context.Context, tblName string) (*metadata.Table, error)
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// Close is invoked to close and release any underlying resources.
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Close() error
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}
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// GripOpenIngester opens a Grip via an ingest function.
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type GripOpenIngester interface {
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// OpenIngest opens a Grip for src by executing ingestFn, which is
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// responsible for ingesting data into dest. If allowCache is false,
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// ingest always occurs; if true, the cache is consulted first (and
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// ingestFn may not be invoked).
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OpenIngest(ctx context.Context, src *source.Source, allowCache bool,
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ingestFn func(ctx context.Context, dest Grip) error) (Grip, error)
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}
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