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