forked from DataDog/dd-trace-go
/
tx.go
64 lines (53 loc) · 1.72 KB
/
tx.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016 Datadog, Inc.
package sql
import (
"context"
"database/sql/driver"
"runtime/trace"
"time"
"gopkg.in/DataDog/dd-trace-go.v1/internal"
)
var _ driver.Tx = (*tracedTx)(nil)
// tracedTx is a traced version of sql.Tx
type tracedTx struct {
driver.Tx
*traceParams
ctx context.Context
}
func noopTaskEnd() {}
// startTraceTask creates an execution trace task with the given name, and
// returns a context.Context associated with the task, and a function to end the
// task.
//
// This is intended for cases where a span would normally be created after an
// operation, where the operation may have been skipped and a span would be
// noisy. Execution trace tasks must cover the actual duration of the operation
// and can't be altered after the fact.
func startTraceTask(ctx context.Context, name string) (context.Context, func()) {
if !trace.IsEnabled() {
return ctx, noopTaskEnd
}
ctx, task := trace.NewTask(ctx, name)
return internal.WithExecutionTraced(ctx), task.End
}
// Commit sends a span at the end of the transaction
func (t *tracedTx) Commit() (err error) {
ctx, end := startTraceTask(t.ctx, QueryTypeCommit)
defer end()
start := time.Now()
err = t.Tx.Commit()
t.tryTrace(ctx, QueryTypeCommit, "", start, err)
return err
}
// Rollback sends a span if the connection is aborted
func (t *tracedTx) Rollback() (err error) {
ctx, end := startTraceTask(t.ctx, QueryTypeRollback)
defer end()
start := time.Now()
err = t.Tx.Rollback()
t.tryTrace(ctx, QueryTypeRollback, "", start, err)
return err
}