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telemetry.go
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telemetry.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 telemetry // import "go.opentelemetry.io/collector/service/telemetry"
import (
"context"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
"go.uber.org/multierr"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type Telemetry struct {
logger *zap.Logger
tracerProvider *sdktrace.TracerProvider
}
func (t *Telemetry) TracerProvider() trace.TracerProvider {
return t.tracerProvider
}
func (t *Telemetry) Logger() *zap.Logger {
return t.logger
}
func (t *Telemetry) Shutdown(ctx context.Context) error {
// TODO: Sync logger.
return multierr.Combine(
t.tracerProvider.Shutdown(ctx),
)
}
// Settings holds configuration for building Telemetry.
type Settings struct {
ZapOptions []zap.Option
}
// New creates a new Telemetry from Config.
func New(_ context.Context, set Settings, cfg Config) (*Telemetry, error) {
logger, err := newLogger(cfg.Logs, set.ZapOptions)
if err != nil {
return nil, err
}
tp := sdktrace.NewTracerProvider(
// needed for supporting the zpages extension
sdktrace.WithSampler(alwaysRecord()),
)
// TODO: Remove when https://github.com/open-telemetry/opentelemetry-go/pull/3268 released.
// For the moment, register and unregister so shutdown does not fail.
sp := &nopSpanProcessor{}
tp.RegisterSpanProcessor(sp)
tp.UnregisterSpanProcessor(sp)
return &Telemetry{
logger: logger,
tracerProvider: tp,
}, nil
}
func newLogger(cfg LogsConfig, options []zap.Option) (*zap.Logger, error) {
// Copied from NewProductionConfig.
zapCfg := &zap.Config{
Level: zap.NewAtomicLevelAt(cfg.Level),
Development: cfg.Development,
Sampling: &zap.SamplingConfig{
Initial: 100,
Thereafter: 100,
},
Encoding: cfg.Encoding,
EncoderConfig: zap.NewProductionEncoderConfig(),
OutputPaths: cfg.OutputPaths,
ErrorOutputPaths: cfg.ErrorOutputPaths,
DisableCaller: cfg.DisableCaller,
DisableStacktrace: cfg.DisableStacktrace,
InitialFields: cfg.InitialFields,
}
if zapCfg.Encoding == "console" {
// Human-readable timestamps for console format of logs.
zapCfg.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
}
logger, err := zapCfg.Build(options...)
if err != nil {
return nil, err
}
return logger, nil
}
type nopSpanProcessor struct {
}
func (n nopSpanProcessor) OnStart(context.Context, sdktrace.ReadWriteSpan) {}
func (n nopSpanProcessor) OnEnd(sdktrace.ReadOnlySpan) {}
func (n nopSpanProcessor) Shutdown(context.Context) error {
return nil
}
func (n nopSpanProcessor) ForceFlush(context.Context) error {
return nil
}