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tracer.go
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tracer.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package trace
import (
"context"
"io"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/trace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"github.com/ava-labs/avalanchego/utils/constants"
"github.com/ava-labs/avalanchego/version"
)
const (
tracerExportTimeout = 10 * time.Second
// [tracerProviderShutdownTimeout] is longer than [tracerExportTimeout] so
// in-flight exports can finish before the tracer provider shuts down.
tracerProviderShutdownTimeout = 15 * time.Second
)
type Config struct {
ExporterConfig `json:"exporterConfig"`
// Used to flag if tracing should be performed
Enabled bool `json:"enabled"`
// The fraction of traces to sample.
// If >= 1 always samples.
// If <= 0 never samples.
TraceSampleRate float64 `json:"traceSampleRate"`
}
type Tracer interface {
trace.Tracer
io.Closer
}
type tracer struct {
trace.Tracer
tp *sdktrace.TracerProvider
}
func (t *tracer) Close() error {
ctx, cancel := context.WithTimeout(context.Background(), tracerProviderShutdownTimeout)
defer cancel()
return t.tp.Shutdown(ctx)
}
func New(config Config) (Tracer, error) {
if !config.Enabled {
return &noOpTracer{
t: trace.NewNoopTracerProvider().Tracer(constants.AppName),
}, nil
}
exporter, err := newExporter(config.ExporterConfig)
if err != nil {
return nil, err
}
tracerProviderOpts := []sdktrace.TracerProviderOption{
sdktrace.WithBatcher(exporter, sdktrace.WithExportTimeout(tracerExportTimeout)),
sdktrace.WithResource(resource.NewWithAttributes(semconv.SchemaURL,
attribute.Stringer("version", version.Current),
semconv.ServiceNameKey.String(constants.AppName),
)),
sdktrace.WithSampler(sdktrace.TraceIDRatioBased(config.TraceSampleRate)),
}
tracerProvider := sdktrace.NewTracerProvider(tracerProviderOpts...)
return &tracer{
Tracer: tracerProvider.Tracer(constants.AppName),
tp: tracerProvider,
}, nil
}