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observer.go
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observer.go
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// +build go1.9
package apmgocql
import (
"context"
"github.com/gocql/gocql"
"go.elastic.co/apm"
"go.elastic.co/apm/stacktrace"
)
func init() {
stacktrace.RegisterLibraryPackage(
"github.com/gocql",
"github.com/gocassa",
)
}
// Observer is a gocql.QueryObserver and gocql.BatchObserver,
// tracing operations and spans within a transaction.
type Observer struct {
tracer *apm.Tracer
}
// NewObserver returns a new Observer which creates spans for
// observed gocql queries.
func NewObserver(o ...Option) *Observer {
opts := options{
tracer: apm.DefaultTracer,
}
for _, o := range o {
o(&opts)
}
return &Observer{tracer: opts.tracer}
}
// ObserveBatch observes batch executions, and creates spans for the
// batch, and sub-spans for each statement therein.
func (o *Observer) ObserveBatch(ctx context.Context, batch gocql.ObservedBatch) {
batchSpan, ctx := apm.StartSpanOptions(ctx, "BATCH", "db.cassandra.batch", apm.SpanOptions{
Start: batch.Start,
})
batchSpan.Duration = batch.End.Sub(batch.Start)
batchSpan.Context.SetDatabase(apm.DatabaseSpanContext{
Type: "cassandra",
Instance: batch.Keyspace,
})
defer batchSpan.End()
for _, statement := range batch.Statements {
span, _ := apm.StartSpanOptions(ctx, querySignature(statement), "db.cassandra.query", apm.SpanOptions{
Start: batch.Start,
})
span.Duration = batchSpan.Duration
span.Context.SetDatabase(apm.DatabaseSpanContext{
Type: "cassandra",
Instance: batch.Keyspace,
Statement: statement,
})
span.End()
}
if e := apm.CaptureError(ctx, batch.Err); e != nil {
e.Timestamp = batch.End
e.Send()
}
}
// ObserveQuery observes query results, and creates spans for them.
func (o *Observer) ObserveQuery(ctx context.Context, query gocql.ObservedQuery) {
span, _ := apm.StartSpanOptions(ctx, querySignature(query.Statement), "db.cassandra.query", apm.SpanOptions{
Start: query.Start,
})
span.Duration = query.End.Sub(query.Start)
span.Context.SetDatabase(apm.DatabaseSpanContext{
Type: "cassandra",
Instance: query.Keyspace,
Statement: query.Statement,
})
if e := apm.CaptureError(ctx, query.Err); e != nil {
e.Timestamp = query.End
e.Send()
}
span.End()
}
type options struct {
tracer *apm.Tracer
}
// Option sets options for observers.
type Option func(*options)