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fdfc821bac
Comment should be complete sentences outside of lists with sentence fragments. This adds the godot linter to check these complete sentences end with punctuation. If they do not, running fix will append a period.
76 lines
2.6 KiB
Go
76 lines
2.6 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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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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