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trace.go
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trace.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package trace
import (
"context"
"fmt"
"sync"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
"go.opentelemetry.io/otel/trace/noop"
)
var (
// Propagator is the default Reva propagator.
Propagator = propagation.NewCompositeTextMapPropagator(propagation.Baggage{}, propagation.TraceContext{})
defaultProvider = revaDefaultTracerProvider{}
)
type revaDefaultTracerProvider struct {
mutex sync.RWMutex
initialized bool
}
// NewTracerProvider returns a new TracerProvider, configure for the specified service
func NewTracerProvider(opts ...Option) trace.TracerProvider {
options := Options{}
for _, o := range opts {
o(&options)
}
if options.TransportCredentials == nil {
options.TransportCredentials = credentials.NewClientTLSFromCert(nil, "")
}
if !options.Enabled {
return noop.NewTracerProvider()
}
// default to 'reva' as service name if not set
if options.ServiceName == "" {
options.ServiceName = "reva"
}
return getOtlpTracerProvider(options)
}
// SetDefaultTracerProvider sets the default trace provider
func SetDefaultTracerProvider(tp trace.TracerProvider) {
otel.SetTracerProvider(tp)
defaultProvider.mutex.Lock()
defer defaultProvider.mutex.Unlock()
defaultProvider.initialized = true
}
// InitDefaultTracerProvider initializes a global default jaeger TracerProvider at a package level.
//
// Deprecated: Use NewTracerProvider and SetDefaultTracerProvider to properly initialize a tracer provider with options
func InitDefaultTracerProvider(collector, endpoint string) {
defaultProvider.mutex.Lock()
defer defaultProvider.mutex.Unlock()
if !defaultProvider.initialized {
SetDefaultTracerProvider(getOtlpTracerProvider(Options{
Endpoint: endpoint,
ServiceName: "reva default otlp provider",
Insecure: true,
}))
}
}
// DefaultProvider returns the "global" default TracerProvider
// Currently used by the pool to get the global tracer
func DefaultProvider() trace.TracerProvider {
defaultProvider.mutex.RLock()
defer defaultProvider.mutex.RUnlock()
return otel.GetTracerProvider()
}
// getOtelTracerProvider returns a new TracerProvider, configure for the specified service
func getOtlpTracerProvider(options Options) trace.TracerProvider {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
transportCredentials := options.TransportCredentials
if options.Insecure {
transportCredentials = insecure.NewCredentials()
}
conn, err := grpc.DialContext(ctx, options.Endpoint,
grpc.WithTransportCredentials(transportCredentials),
)
if err != nil {
panic(fmt.Errorf("failed to create gRPC connection to endpoint: %w", err))
}
exporter, err := otlptracegrpc.New(
context.Background(),
otlptracegrpc.WithGRPCConn(conn),
)
if err != nil {
panic(err)
}
resources, err := resource.New(
context.Background(),
resource.WithAttributes(
attribute.String("service.name", options.ServiceName),
attribute.String("library.language", "go"),
),
)
if err != nil {
panic(err)
}
return sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(resources),
)
}