/
span_processor_filter_example_test.go
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/
span_processor_filter_example_test.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"context"
"time"
)
// DurationFilter is a SpanProcessor that filters spans that have lifetimes
// outside of a defined range.
type DurationFilter struct {
// Next is the next SpanProcessor in the chain.
Next SpanProcessor
// Min is the duration under which spans are dropped.
Min time.Duration
// Max is the duration over which spans are dropped.
Max time.Duration
}
func (f DurationFilter) OnStart(parent context.Context, s ReadWriteSpan) {
f.Next.OnStart(parent, s)
}
func (f DurationFilter) Shutdown(ctx context.Context) error { return f.Next.Shutdown(ctx) }
func (f DurationFilter) ForceFlush(ctx context.Context) error { return f.Next.ForceFlush(ctx) }
func (f DurationFilter) OnEnd(s ReadOnlySpan) {
if f.Min > 0 && s.EndTime().Sub(s.StartTime()) < f.Min {
// Drop short lived spans.
return
}
if f.Max > 0 && s.EndTime().Sub(s.StartTime()) > f.Max {
// Drop long lived spans.
return
}
f.Next.OnEnd(s)
}
// InstrumentationBlacklist is a SpanProcessor that drops all spans from
// certain instrumentation.
type InstrumentationBlacklist struct {
// Next is the next SpanProcessor in the chain.
Next SpanProcessor
// Blacklist is the set of instrumentation names for which spans will be
// dropped.
Blacklist map[string]bool
}
func (f InstrumentationBlacklist) OnStart(parent context.Context, s ReadWriteSpan) {
f.Next.OnStart(parent, s)
}
func (f InstrumentationBlacklist) Shutdown(ctx context.Context) error { return f.Next.Shutdown(ctx) }
func (f InstrumentationBlacklist) ForceFlush(ctx context.Context) error {
return f.Next.ForceFlush(ctx)
}
func (f InstrumentationBlacklist) OnEnd(s ReadOnlySpan) {
if f.Blacklist != nil && f.Blacklist[s.InstrumentationScope().Name] {
// Drop spans from this instrumentation
return
}
f.Next.OnEnd(s)
}
type noopExporter struct{}
func (noopExporter) ExportSpans(context.Context, []ReadOnlySpan) error { return nil }
func (noopExporter) Shutdown(context.Context) error { return nil }
func ExampleSpanProcessor_filtered() {
exportSP := NewSimpleSpanProcessor(noopExporter{})
// Build a SpanProcessor chain to filter out all spans from the pernicious
// "naughty-instrumentation" dependency and only allow spans shorter than
// an minute and longer than a second to be exported with the exportSP.
filter := DurationFilter{
Next: InstrumentationBlacklist{
Next: exportSP,
Blacklist: map[string]bool{
"naughty-instrumentation": true,
},
},
Min: time.Second,
Max: time.Minute,
}
_ = NewTracerProvider(WithSpanProcessor(filter))
// ...
}