mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-01-05 22:54:18 +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
78 lines
2.7 KiB
Go
78 lines
2.7 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 handler // import "go.opentelemetry.io/otel/example/passthrough/handler"
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import (
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"context"
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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/propagation"
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"go.opentelemetry.io/otel/trace"
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)
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// Handler is a minimal implementation of the handler and client from
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// go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp for demonstration purposes.
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// It handles an incoming http request, and makes an outgoing http request.
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type Handler struct {
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propagators propagation.TextMapPropagator
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tracer trace.Tracer
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next func(r *http.Request)
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}
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// New returns a new Handler that will trace requests before handing them off
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// to next.
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func New(next func(r *http.Request)) *Handler {
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// Like most instrumentation packages, this handler defaults to using the
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// global progatators and tracer providers.
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return &Handler{
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propagators: otel.GetTextMapPropagator(),
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tracer: otel.Tracer("examples/passthrough/handler"),
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next: next,
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}
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}
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// HandleHTTPReq mimics what an instrumented http server does.
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func (h *Handler) HandleHTTPReq(r *http.Request) {
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ctx := h.propagators.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
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var span trace.Span
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log.Println("The \"handle passthrough request\" span should NOT be recorded, because it is recorded by a TracerProvider not backed by the SDK.")
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ctx, span = h.tracer.Start(ctx, "handle passthrough request")
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defer span.End()
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// Pretend to do work
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time.Sleep(time.Second)
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h.makeOutgoingRequest(ctx)
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}
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// makeOutgoingRequest mimics what an instrumented http client does.
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func (h *Handler) makeOutgoingRequest(ctx context.Context) {
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// make a new 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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log.Println("The \"make outgoing request from passthrough\" span should NOT be recorded, because it is recorded by a TracerProvider not backed by the SDK.")
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ctx, span := h.tracer.Start(ctx, "make outgoing request from passthrough")
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defer span.End()
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r = r.WithContext(ctx)
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h.propagators.Inject(ctx, propagation.HeaderCarrier(r.Header))
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h.next(r)
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}
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