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124 lines
3.5 KiB
124 lines
3.5 KiB
// Copyright (c) 2019 The Jaeger Authors.
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// Copyright (c) 2017 Uber Technologies, Inc.
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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 route
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import (
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"context"
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"encoding/json"
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"math"
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"math/rand"
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"net/http"
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"time"
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"go.opentelemetry.io/otel/trace"
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"go.uber.org/zap"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/delay"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/httperr"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/tracing"
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"github.com/jaegertracing/jaeger/examples/hotrod/services/config"
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)
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// Server implements Route service
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type Server struct {
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hostPort string
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tracer trace.TracerProvider
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logger log.Factory
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}
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// NewServer creates a new route.Server
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func NewServer(hostPort string, tracer trace.TracerProvider, logger log.Factory) *Server {
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return &Server{
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hostPort: hostPort,
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tracer: tracer,
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logger: logger,
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}
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}
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// Run starts the Route server
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func (s *Server) Run() error {
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mux := s.createServeMux()
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s.logger.Bg().Info("Starting", zap.String("address", "http://"+s.hostPort))
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server := &http.Server{
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Addr: s.hostPort,
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Handler: mux,
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ReadHeaderTimeout: 3 * time.Second,
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}
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return server.ListenAndServe()
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}
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func (s *Server) createServeMux() http.Handler {
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mux := tracing.NewServeMux(false, s.tracer, s.logger)
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mux.Handle("/route", http.HandlerFunc(s.route))
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mux.Handle("/debug/vars", http.HandlerFunc(movedToFrontend))
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mux.Handle("/metrics", http.HandlerFunc(movedToFrontend))
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return mux
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}
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func movedToFrontend(w http.ResponseWriter, r *http.Request) {
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http.Error(w, "endpoint moved to the frontend service", http.StatusNotFound)
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}
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func (s *Server) route(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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s.logger.For(ctx).Info("HTTP request received", zap.String("method", r.Method), zap.Stringer("url", r.URL))
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if err := r.ParseForm(); httperr.HandleError(w, err, http.StatusBadRequest) {
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s.logger.For(ctx).Error("bad request", zap.Error(err))
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return
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}
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pickup := r.Form.Get("pickup")
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if pickup == "" {
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http.Error(w, "Missing required 'pickup' parameter", http.StatusBadRequest)
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return
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}
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dropoff := r.Form.Get("dropoff")
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if dropoff == "" {
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http.Error(w, "Missing required 'dropoff' parameter", http.StatusBadRequest)
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return
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}
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response := computeRoute(ctx, pickup, dropoff)
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data, err := json.Marshal(response)
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if httperr.HandleError(w, err, http.StatusInternalServerError) {
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s.logger.For(ctx).Error("cannot marshal response", zap.Error(err))
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(data)
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}
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func computeRoute(ctx context.Context, pickup, dropoff string) *Route {
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start := time.Now()
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defer func() {
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updateCalcStats(ctx, time.Since(start))
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}()
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// Simulate expensive calculation
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delay.Sleep(config.RouteCalcDelay, config.RouteCalcDelayStdDev)
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eta := math.Max(2, rand.NormFloat64()*3+5)
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return &Route{
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Pickup: pickup,
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Dropoff: dropoff,
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ETA: time.Duration(eta) * time.Minute,
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}
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}
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