mirror of https://github.com/jackc/pgx.git
Add pipeline mode to pgconn
Jack Christensen
parent
ed3e9f1dd4
commit
ae2881a23c
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@ -16,6 +16,8 @@ pgconn now uses non-blocking IO. This is a significant internal restructuring, b
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`CheckConn()` checks a connection's liveness by doing a non-blocking read. This can be used to detect database restarts or network interruptions without executing a query or a ping.
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pgconn now supports pipeline mode.
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## pgtype
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The `pgtype` package has been significantly changed.
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@ -18,6 +18,11 @@ Executing Multiple Queries in a Single Round Trip
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Exec and ExecBatch can execute multiple queries in a single round trip. They return readers that iterate over each query
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result. The ReadAll method reads all query results into memory.
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Pipeline Mode
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Pipeline mode allows sending queries without having read the results of previously sent queries. It allows
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control of exactly how many and when network round trips occur.
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Context Support
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All potentially blocking operations take a context.Context. If a context is canceled while the method is in progress the
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272
pgconn/pgconn.go
272
pgconn/pgconn.go
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@ -81,6 +81,7 @@ type PgConn struct {
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// Reusable / preallocated resources
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resultReader ResultReader
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multiResultReader MultiResultReader
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pipeline Pipeline
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contextWatcher *ctxwatch.ContextWatcher
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cleanupDone chan struct{}
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@ -1242,8 +1243,9 @@ func (pgConn *PgConn) CopyFrom(ctx context.Context, r io.Reader, sql string) (Co
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// MultiResultReader is a reader for a command that could return multiple results such as Exec or ExecBatch.
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type MultiResultReader struct {
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pgConn *PgConn
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ctx context.Context
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pgConn *PgConn
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ctx context.Context
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pipeline *Pipeline
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rr *ResultReader
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@ -1276,9 +1278,13 @@ func (mrr *MultiResultReader) receiveMessage() (pgproto3.BackendMessage, error)
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switch msg := msg.(type) {
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case *pgproto3.ReadyForQuery:
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mrr.pgConn.contextWatcher.Unwatch()
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mrr.closed = true
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mrr.pgConn.unlock()
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if mrr.pipeline != nil {
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mrr.pipeline.expectedReadyForQueryCount--
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} else {
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mrr.pgConn.contextWatcher.Unwatch()
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mrr.pgConn.unlock()
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}
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case *pgproto3.ErrorResponse:
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mrr.err = ErrorResponseToPgError(msg)
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}
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@ -1341,6 +1347,7 @@ func (mrr *MultiResultReader) Close() error {
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type ResultReader struct {
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pgConn *PgConn
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multiResultReader *MultiResultReader
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pipeline *Pipeline
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ctx context.Context
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fieldDescriptions []pgproto3.FieldDescription
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@ -1429,7 +1436,7 @@ func (rr *ResultReader) Close() (CommandTag, error) {
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}
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}
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if rr.multiResultReader == nil {
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if rr.multiResultReader == nil && rr.pipeline == nil {
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for {
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msg, err := rr.receiveMessage()
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if err != nil {
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@ -1539,7 +1546,8 @@ func (batch *Batch) ExecPrepared(stmtName string, paramValues [][]byte, paramFor
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}
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// ExecBatch executes all the queries in batch in a single round-trip. Execution is implicitly transactional unless a
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// transaction is already in progress or SQL contains transaction control statements.
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// transaction is already in progress or SQL contains transaction control statements. This is a simpler way of executing
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// multiple queries in a single round trip than using pipeline mode.
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func (pgConn *PgConn) ExecBatch(ctx context.Context, batch *Batch) *MultiResultReader {
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if err := pgConn.lock(); err != nil {
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return &MultiResultReader{
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@ -1676,3 +1684,255 @@ func Construct(hc *HijackedConn) (*PgConn, error) {
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return pgConn, nil
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}
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// Pipeline represents a connection in pipeline mode.
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//
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// SendPrepare, SendQueryParam, and SendQueryPrepared queue requests to the server. These requests are not written until
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// pipeline is flushed by Flush or Sync. Sync must be called after the last request is queued. Requests between
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// synchronization points are implicitly transactional unless explicit transaction control statements have been issued.
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//
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// The context the pipeline was started with is in effect for the entire life of the Pipeline.
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//
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// For a deeper understanding of pipeline mode see the PostgreSQL documentation for the extended query protocol
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// (https://www.postgresql.org/docs/current/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY) and the libpq pipeline mode
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// (https://www.postgresql.org/docs/current/libpq-pipeline-mode.html).
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type Pipeline struct {
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conn *PgConn
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ctx context.Context
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expectedReadyForQueryCount int
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pendingSync bool
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err error
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closed bool
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}
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// PipelineSync is returned by GetResults when a ReadyForQuery message is received.
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type PipelineSync struct{}
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// StartPipeline switches the connection to pipeline mode and returns a *Pipeline. In pipeline mode requests can be sent
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// to the server without waiting for a response. Close must be called on the returned *Pipeline to return the connection
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// to normal mode. While in pipeline mode, no methods that communicate with the server may be called except
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// CancelRequest and Close. ctx is in effect for entire life of the *Pipeline.
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//
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// Prefer ExecBatch when only sending one group of queries at once.
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func (pgConn *PgConn) StartPipeline(ctx context.Context) *Pipeline {
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if err := pgConn.lock(); err != nil {
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return &Pipeline{
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closed: true,
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err: err,
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}
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}
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pgConn.pipeline = Pipeline{
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conn: pgConn,
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ctx: ctx,
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}
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pipeline := &pgConn.pipeline
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if ctx != context.Background() {
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select {
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case <-ctx.Done():
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pipeline.closed = true
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pipeline.err = newContextAlreadyDoneError(ctx)
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pgConn.unlock()
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return pipeline
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default:
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}
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pgConn.contextWatcher.Watch(ctx)
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}
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return pipeline
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}
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// SendPrepare is the pipeline version of *PgConn.Prepare.
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func (p *Pipeline) SendPrepare(name, sql string, paramOIDs []uint32) {
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if p.closed {
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return
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}
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p.pendingSync = true
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p.conn.frontend.SendParse(&pgproto3.Parse{Name: name, Query: sql, ParameterOIDs: paramOIDs})
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p.conn.frontend.SendDescribe(&pgproto3.Describe{ObjectType: 'S', Name: name})
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}
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// SendQueryParams is the pipeline version of *PgConn.QueryParams.
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func (p *Pipeline) SendQueryParams(sql string, paramValues [][]byte, paramOIDs []uint32, paramFormats []int16, resultFormats []int16) {
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if p.closed {
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return
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}
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p.pendingSync = true
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p.conn.frontend.SendParse(&pgproto3.Parse{Query: sql, ParameterOIDs: paramOIDs})
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p.conn.frontend.SendBind(&pgproto3.Bind{ParameterFormatCodes: paramFormats, Parameters: paramValues, ResultFormatCodes: resultFormats})
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p.conn.frontend.SendDescribe(&pgproto3.Describe{ObjectType: 'P'})
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p.conn.frontend.SendExecute(&pgproto3.Execute{})
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}
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// SendQueryPrepared is the pipeline version of *PgConn.QueryPrepared.
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func (p *Pipeline) SendQueryPrepared(stmtName string, paramValues [][]byte, paramFormats []int16, resultFormats []int16) {
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if p.closed {
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return
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}
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p.pendingSync = true
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p.conn.frontend.SendBind(&pgproto3.Bind{PreparedStatement: stmtName, ParameterFormatCodes: paramFormats, Parameters: paramValues, ResultFormatCodes: resultFormats})
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p.conn.frontend.SendDescribe(&pgproto3.Describe{ObjectType: 'P'})
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p.conn.frontend.SendExecute(&pgproto3.Execute{})
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}
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// Flush flushes the queued requests without establishing a synchronization point.
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func (p *Pipeline) Flush() error {
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if p.closed {
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if p.err != nil {
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return p.err
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}
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return errors.New("pipeline closed")
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}
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err := p.conn.frontend.Flush()
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if err != nil {
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err = preferContextOverNetTimeoutError(p.ctx, err)
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p.conn.asyncClose()
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p.conn.contextWatcher.Unwatch()
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p.conn.unlock()
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p.closed = true
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p.err = err
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return err
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}
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return nil
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}
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// Sync establishes a synchronization point and flushes the queued requests.
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func (p *Pipeline) Sync() error {
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p.conn.frontend.SendSync(&pgproto3.Sync{})
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err := p.Flush()
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if err != nil {
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return err
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}
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p.pendingSync = false
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p.expectedReadyForQueryCount++
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return nil
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}
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// GetResults gets the next results. If results are present, results may be a *ResultReader, *StatementDescription, or
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// *PipelineSync. If an ErrorResponse is received from the server, results will be nil and err will be a *PgError. If no
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// results are available, results and err will both be nil.
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func (p *Pipeline) GetResults() (results any, err error) {
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if p.expectedReadyForQueryCount == 0 {
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return nil, nil
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}
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for {
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msg, err := p.conn.receiveMessage()
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if err != nil {
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return nil, err
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}
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switch msg := msg.(type) {
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case *pgproto3.RowDescription:
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p.conn.resultReader = ResultReader{
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pgConn: p.conn,
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pipeline: p,
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ctx: p.ctx,
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fieldDescriptions: msg.Fields,
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}
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return &p.conn.resultReader, nil
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case *pgproto3.CommandComplete:
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p.conn.resultReader = ResultReader{
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commandTag: p.conn.makeCommandTag(msg.CommandTag),
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commandConcluded: true,
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closed: true,
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}
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return &p.conn.resultReader, nil
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case *pgproto3.ParseComplete:
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peekedMsg, err := p.conn.peekMessage()
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if err != nil {
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return nil, err
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}
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if _, ok := peekedMsg.(*pgproto3.ParameterDescription); ok {
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return p.getResultsPrepare()
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}
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case *pgproto3.ReadyForQuery:
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p.expectedReadyForQueryCount--
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return &PipelineSync{}, nil
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case *pgproto3.ErrorResponse:
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pgErr := ErrorResponseToPgError(msg)
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return nil, pgErr
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}
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}
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}
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func (p *Pipeline) getResultsPrepare() (*StatementDescription, error) {
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psd := &StatementDescription{}
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for {
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msg, err := p.conn.receiveMessage()
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if err != nil {
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p.conn.asyncClose()
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return nil, preferContextOverNetTimeoutError(p.ctx, err)
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}
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switch msg := msg.(type) {
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case *pgproto3.ParameterDescription:
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psd.ParamOIDs = make([]uint32, len(msg.ParameterOIDs))
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copy(psd.ParamOIDs, msg.ParameterOIDs)
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case *pgproto3.RowDescription:
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psd.Fields = make([]pgproto3.FieldDescription, len(msg.Fields))
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copy(psd.Fields, msg.Fields)
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return psd, nil
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// These should never happen here. But don't take chances that could lead to a deadlock.
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case *pgproto3.ErrorResponse:
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pgErr := ErrorResponseToPgError(msg)
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return nil, pgErr
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case *pgproto3.CommandComplete:
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p.conn.asyncClose()
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return nil, errors.New("BUG: received CommandComplete while handling Describe")
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case *pgproto3.ReadyForQuery:
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p.conn.asyncClose()
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return nil, errors.New("BUG: received ReadyForQuery while handling Describe")
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}
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}
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}
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// Close closes the pipeline and returns the connection to normal mode.
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func (p *Pipeline) Close() error {
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if p.closed {
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return p.err
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}
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p.closed = true
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if p.pendingSync {
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p.conn.asyncClose()
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p.err = errors.New("pipeline has unsynced requests")
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p.conn.contextWatcher.Unwatch()
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p.conn.unlock()
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return p.err
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}
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for p.expectedReadyForQueryCount > 0 {
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_, err := p.GetResults()
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if err != nil {
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var pgErr *PgError
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if !errors.As(err, &pgErr) {
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p.conn.asyncClose()
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p.err = err
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break
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}
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}
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}
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p.conn.contextWatcher.Unwatch()
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p.conn.unlock()
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return p.err
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}
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@ -20,6 +20,7 @@ import (
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"github.com/jackc/pgx/v5/internal/pgmock"
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"github.com/jackc/pgx/v5/pgconn"
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"github.com/jackc/pgx/v5/pgproto3"
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"github.com/jackc/pgx/v5/pgtype"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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@ -2094,6 +2095,417 @@ func TestConnCheckConn(t *testing.T) {
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require.Error(t, err)
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}
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func TestPipelinePrepare(t *testing.T) {
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t.Parallel()
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pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
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require.NoError(t, err)
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defer closeConn(t, pgConn)
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pipeline := pgConn.StartPipeline(context.Background())
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pipeline.SendPrepare("selectInt", "select $1::int as a", nil)
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pipeline.SendPrepare("selectText", "select $1::text as b", nil)
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pipeline.SendPrepare("selectNoParams", "select 42 as c", nil)
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err = pipeline.Sync()
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require.NoError(t, err)
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results, err := pipeline.GetResults()
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require.NoError(t, err)
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sd, ok := results.(*pgconn.StatementDescription)
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require.Truef(t, ok, "expected StatementDescription, got: %#v", results)
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require.Len(t, sd.Fields, 1)
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require.Equal(t, string(sd.Fields[0].Name), "a")
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require.Equal(t, []uint32{pgtype.Int4OID}, sd.ParamOIDs)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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sd, ok = results.(*pgconn.StatementDescription)
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require.Truef(t, ok, "expected StatementDescription, got: %#v", results)
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require.Len(t, sd.Fields, 1)
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require.Equal(t, string(sd.Fields[0].Name), "b")
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require.Equal(t, []uint32{pgtype.TextOID}, sd.ParamOIDs)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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sd, ok = results.(*pgconn.StatementDescription)
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require.Truef(t, ok, "expected StatementDescription, got: %#v", results)
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require.Len(t, sd.Fields, 1)
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require.Equal(t, string(sd.Fields[0].Name), "c")
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require.Equal(t, []uint32{}, sd.ParamOIDs)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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_, ok = results.(*pgconn.PipelineSync)
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require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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require.Nil(t, results)
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err = pipeline.Close()
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require.NoError(t, err)
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ensureConnValid(t, pgConn)
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}
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func TestPipelinePrepareError(t *testing.T) {
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t.Parallel()
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pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
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require.NoError(t, err)
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defer closeConn(t, pgConn)
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pipeline := pgConn.StartPipeline(context.Background())
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pipeline.SendPrepare("selectInt", "select $1::int as a", nil)
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pipeline.SendPrepare("selectError", "bad", nil)
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pipeline.SendPrepare("selectText", "select $1::text as b", nil)
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err = pipeline.Sync()
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require.NoError(t, err)
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results, err := pipeline.GetResults()
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require.NoError(t, err)
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sd, ok := results.(*pgconn.StatementDescription)
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require.Truef(t, ok, "expected StatementDescription, got: %#v", results)
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require.Len(t, sd.Fields, 1)
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require.Equal(t, string(sd.Fields[0].Name), "a")
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require.Equal(t, []uint32{pgtype.Int4OID}, sd.ParamOIDs)
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results, err = pipeline.GetResults()
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var pgErr *pgconn.PgError
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require.ErrorAs(t, err, &pgErr)
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require.Nil(t, results)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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_, ok = results.(*pgconn.PipelineSync)
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require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
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results, err = pipeline.GetResults()
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require.NoError(t, err)
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require.Nil(t, results)
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err = pipeline.Close()
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require.NoError(t, err)
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ensureConnValid(t, pgConn)
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}
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func TestPipelineQuery(t *testing.T) {
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t.Parallel()
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pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
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require.NoError(t, err)
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defer closeConn(t, pgConn)
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pipeline := pgConn.StartPipeline(context.Background())
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pipeline.SendQueryParams(`select 1`, nil, nil, nil, nil)
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pipeline.SendQueryParams(`select 2`, nil, nil, nil, nil)
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pipeline.SendQueryParams(`select 3`, nil, nil, nil, nil)
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err = pipeline.Sync()
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require.NoError(t, err)
|
||||
|
||||
pipeline.SendQueryParams(`select 4`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 5`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
results, err := pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok := results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult := rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "1", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "2", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "3", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "4", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "5", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
require.Nil(t, results)
|
||||
|
||||
err = pipeline.Close()
|
||||
require.NoError(t, err)
|
||||
|
||||
ensureConnValid(t, pgConn)
|
||||
}
|
||||
|
||||
func TestPipelinePrepareQuery(t *testing.T) {
|
||||
t.Parallel()
|
||||
|
||||
pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
|
||||
require.NoError(t, err)
|
||||
defer closeConn(t, pgConn)
|
||||
|
||||
pipeline := pgConn.StartPipeline(context.Background())
|
||||
pipeline.SendPrepare("ps", "select $1::text as msg", nil)
|
||||
pipeline.SendQueryPrepared(`ps`, [][]byte{[]byte("hello")}, nil, nil)
|
||||
pipeline.SendQueryPrepared(`ps`, [][]byte{[]byte("goodbye")}, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
results, err := pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
sd, ok := results.(*pgconn.StatementDescription)
|
||||
require.Truef(t, ok, "expected StatementDescription, got: %#v", results)
|
||||
require.Len(t, sd.Fields, 1)
|
||||
require.Equal(t, string(sd.Fields[0].Name), "msg")
|
||||
require.Equal(t, []uint32{pgtype.TextOID}, sd.ParamOIDs)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok := results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult := rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "hello", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "goodbye", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
require.Nil(t, results)
|
||||
|
||||
err = pipeline.Close()
|
||||
require.NoError(t, err)
|
||||
|
||||
ensureConnValid(t, pgConn)
|
||||
}
|
||||
|
||||
func TestPipelineQueryErrorBetweenSyncs(t *testing.T) {
|
||||
t.Parallel()
|
||||
|
||||
pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
|
||||
require.NoError(t, err)
|
||||
defer closeConn(t, pgConn)
|
||||
|
||||
pipeline := pgConn.StartPipeline(context.Background())
|
||||
pipeline.SendQueryParams(`select 1`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 2`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
pipeline.SendQueryParams(`select 3`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 1/(3-n) from generate_series(1,10) n`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 4`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
pipeline.SendQueryParams(`select 5`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 6`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
results, err := pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok := results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult := rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "1", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "2", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "3", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
var pgErr *pgconn.PgError
|
||||
require.ErrorAs(t, readResult.Err, &pgErr)
|
||||
require.Equal(t, "22012", pgErr.Code)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "5", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok = results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult = rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "6", string(readResult.Rows[0][0]))
|
||||
|
||||
results, err = pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
_, ok = results.(*pgconn.PipelineSync)
|
||||
require.Truef(t, ok, "expected PipelineSync, got: %#v", results)
|
||||
|
||||
err = pipeline.Close()
|
||||
require.NoError(t, err)
|
||||
|
||||
ensureConnValid(t, pgConn)
|
||||
}
|
||||
|
||||
func TestPipelineCloseReadsUnreadResults(t *testing.T) {
|
||||
t.Parallel()
|
||||
|
||||
pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
|
||||
require.NoError(t, err)
|
||||
defer closeConn(t, pgConn)
|
||||
|
||||
pipeline := pgConn.StartPipeline(context.Background())
|
||||
pipeline.SendQueryParams(`select 1`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 2`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 3`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
pipeline.SendQueryParams(`select 4`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 5`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
results, err := pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok := results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult := rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "1", string(readResult.Rows[0][0]))
|
||||
|
||||
err = pipeline.Close()
|
||||
require.NoError(t, err)
|
||||
|
||||
ensureConnValid(t, pgConn)
|
||||
}
|
||||
|
||||
func TestPipelineCloseDetectsUnsyncedRequests(t *testing.T) {
|
||||
t.Parallel()
|
||||
|
||||
pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
|
||||
require.NoError(t, err)
|
||||
defer closeConn(t, pgConn)
|
||||
|
||||
pipeline := pgConn.StartPipeline(context.Background())
|
||||
pipeline.SendQueryParams(`select 1`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 2`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 3`, nil, nil, nil, nil)
|
||||
err = pipeline.Sync()
|
||||
require.NoError(t, err)
|
||||
|
||||
pipeline.SendQueryParams(`select 4`, nil, nil, nil, nil)
|
||||
pipeline.SendQueryParams(`select 5`, nil, nil, nil, nil)
|
||||
|
||||
results, err := pipeline.GetResults()
|
||||
require.NoError(t, err)
|
||||
rr, ok := results.(*pgconn.ResultReader)
|
||||
require.Truef(t, ok, "expected ResultReader, got: %#v", results)
|
||||
readResult := rr.Read()
|
||||
require.NoError(t, readResult.Err)
|
||||
require.Len(t, readResult.Rows, 1)
|
||||
require.Len(t, readResult.Rows[0], 1)
|
||||
require.Equal(t, "1", string(readResult.Rows[0][0]))
|
||||
|
||||
err = pipeline.Close()
|
||||
require.EqualError(t, err, "pipeline has unsynced requests")
|
||||
}
|
||||
|
||||
func Example() {
|
||||
pgConn, err := pgconn.Connect(context.Background(), os.Getenv("PGX_TEST_CONN_STRING"))
|
||||
if err != nil {
|
||||
|
|
|
|||
Loading…
Reference in New Issue