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package postgres |
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import ( |
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"context" |
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"database/sql" |
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"time" |
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"github.com/cenkalti/backoff/v4" |
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"github.com/Masterminds/squirrel" |
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_ "github.com/jackc/pgx/v5/stdlib" |
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) |
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// Postgres - Structure for Postresql instance |
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type Postgres struct { |
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DB *sql.DB |
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Builder squirrel.StatementBuilderType |
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// options |
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maxDataPerWrite int |
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maxRetries int |
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watchBufferSize int |
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maxConnectionLifeTime time.Duration |
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maxConnectionIdleTime time.Duration |
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maxOpenConnections int |
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maxIdleConnections int |
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} |
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// New - Creates new postgresql db instance |
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func New(uri string, opts ...Option) (*Postgres, error) { |
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pg := &Postgres{ |
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maxOpenConnections: _defaultMaxOpenConnections, |
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maxIdleConnections: _defaultMaxIdleConnections, |
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maxDataPerWrite: _defaultMaxDataPerWrite, |
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maxRetries: _defaultMaxRetries, |
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watchBufferSize: _defaultWatchBufferSize, |
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} |
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// Custom options |
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for _, opt := range opts { |
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opt(pg) |
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} |
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pg.Builder = squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar) |
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db, err := sql.Open("pgx", uri) |
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if err != nil { |
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return nil, err |
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} |
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if pg.maxOpenConnections != 0 { |
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db.SetMaxOpenConns(pg.maxOpenConnections) |
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} |
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if pg.maxIdleConnections != 0 { |
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db.SetMaxIdleConns(pg.maxIdleConnections) |
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} |
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if pg.maxConnectionLifeTime != 0 { |
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db.SetConnMaxLifetime(pg.maxConnectionLifeTime) |
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} |
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if pg.maxConnectionIdleTime != 0 { |
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db.SetConnMaxIdleTime(pg.maxConnectionIdleTime) |
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} |
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policy := backoff.NewExponentialBackOff() |
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policy.MaxElapsedTime = 1 * time.Minute |
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err = backoff.Retry(func() error { |
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err = db.PingContext(context.Background()) |
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if err != nil { |
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return err |
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} |
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return nil |
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}, policy) |
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if err != nil { |
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return nil, err |
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} |
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pg.DB = db |
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return pg, nil |
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} |
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func (p *Postgres) GetMaxDataPerWrite() int { |
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return p.maxDataPerWrite |
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} |
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func (p *Postgres) GetMaxRetries() int { |
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return p.maxRetries |
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} |
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func (p *Postgres) GetWatchBufferSize() int { |
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return p.watchBufferSize |
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} |
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// GetEngineType - Get the engine type which is postgresql in string |
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func (p *Postgres) GetEngineType() string { |
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return "postgres" |
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} |
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// Close - Close postgresql instance |
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func (p *Postgres) Close() error { |
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if p.DB != nil { |
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return p.DB.Close() |
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} |
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return nil |
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} |
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// IsReady - Check if database is ready |
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func (p *Postgres) IsReady(ctx context.Context) (bool, error) { |
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ctx, cancel := context.WithTimeout(ctx, 2*time.Second) |
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defer cancel() |
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if err := p.DB.PingContext(ctx); err != nil { |
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return false, err |
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} |
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return true, nil |
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} |
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Permify /
permify
