mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-12 10:04:29 +02:00
1f5b159161
* Refactor golangci-lint conf Order settings alphabetically. * Add revive settings to golangci conf * Check blank imports * Check bool-literal-in-expr * Check constant-logical-expr * Check context-as-argument * Check context-key-type * Check deep-exit * Check defer * Check dot-imports * Check duplicated-imports * Check early-return * Check empty-block * Check empty-lines * Check error-naming * Check error-return * Check error-strings * Check errorf * Stop ignoring context first arg in tests * Check exported comments * Check flag-parameter * Check identical branches * Check if-return * Check increment-decrement * Check indent-error-flow * Check deny list of go imports * Check import shadowing * Check package comments * Check range * Check range val in closure * Check range val address * Check redefines builtin id * Check string-format * Check struct tag * Check superfluous else * Check time equal * Check var naming * Check var declaration * Check unconditional recursion * Check unexported return * Check unhandled errors * Check unnecessary stmt * Check unnecessary break * Check waitgroup by value * Exclude deep-exit check in example*_test.go files
93 lines
3.3 KiB
Go
93 lines
3.3 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"time"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/example/passthrough/handler"
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"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
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"go.opentelemetry.io/otel/propagation"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/trace"
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)
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func main() {
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ctx := context.Background()
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initPassthroughGlobals()
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tp, err := nonGlobalTracer()
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if err != nil {
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log.Fatal(err)
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}
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defer func() { _ = tp.Shutdown(ctx) }()
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// make an initial http request
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r, err := http.NewRequest("", "", nil)
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if err != nil {
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panic(err)
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}
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// This is roughly what an instrumented http client does.
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log.Println("The \"make outer request\" span should be recorded, because it is recorded with a Tracer from the SDK TracerProvider")
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var span trace.Span
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ctx, span = tp.Tracer("example/passthrough/outer").Start(ctx, "make outer request")
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defer span.End()
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r = r.WithContext(ctx)
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otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(r.Header))
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backendFunc := func(r *http.Request) {
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// This is roughly what an instrumented http server does.
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ctx := otel.GetTextMapPropagator().Extract(r.Context(), propagation.HeaderCarrier(r.Header))
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log.Println("The \"handle inner request\" span should be recorded, because it is recorded with a Tracer from the SDK TracerProvider")
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_, span := tp.Tracer("example/passthrough/inner").Start(ctx, "handle inner request")
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defer span.End()
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// Do "backend work"
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time.Sleep(time.Second)
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}
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// This handler will be a passthrough, since we didn't set a global TracerProvider
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passthroughHandler := handler.New(backendFunc)
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passthroughHandler.HandleHTTPReq(r)
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}
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func initPassthroughGlobals() {
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// We explicitly DO NOT set the global TracerProvider using otel.SetTracerProvider().
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// The unset TracerProvider returns a "non-recording" span, but still passes through context.
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log.Println("Register a global TextMapPropagator, but do not register a global TracerProvider to be in \"passthrough\" mode.")
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log.Println("The \"passthrough\" mode propagates the TraceContext and Baggage, but does not record spans.")
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otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
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}
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// nonGlobalTracer creates a trace provider instance for testing, but doesn't
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// set it as the global tracer provider.
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func nonGlobalTracer() (*sdktrace.TracerProvider, error) {
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exp, err := stdouttrace.New(stdouttrace.WithPrettyPrint())
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if err != nil {
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return nil, fmt.Errorf("failed to initialize stdouttrace exporter: %w", err)
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}
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bsp := sdktrace.NewBatchSpanProcessor(exp)
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tp := sdktrace.NewTracerProvider(
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sdktrace.WithSampler(sdktrace.AlwaysSample()),
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sdktrace.WithSpanProcessor(bsp),
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)
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return tp, nil
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}
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