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zipkin.go
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zipkin.go
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// Copyright (c) 2020 The Jaeger Authors.
//
// 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 server
import (
"net"
"net/http"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/rs/cors"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/jaegertracing/jaeger/cmd/collector/app/handler"
"github.com/jaegertracing/jaeger/cmd/collector/app/zipkin"
"github.com/jaegertracing/jaeger/pkg/config/tlscfg"
"github.com/jaegertracing/jaeger/pkg/healthcheck"
"github.com/jaegertracing/jaeger/pkg/httpmetrics"
"github.com/jaegertracing/jaeger/pkg/metrics"
"github.com/jaegertracing/jaeger/pkg/recoveryhandler"
)
// ZipkinServerParams to construct a new Jaeger Collector Zipkin Server
type ZipkinServerParams struct {
TLSConfig tlscfg.Options
HostPort string
Handler handler.ZipkinSpansHandler
AllowedOrigins string
AllowedHeaders string
HealthCheck *healthcheck.HealthCheck
Logger *zap.Logger
MetricsFactory metrics.Factory
}
// StartZipkinServer based on the given parameters
func StartZipkinServer(params *ZipkinServerParams) (*http.Server, error) {
if params.HostPort == "" {
params.Logger.Info("Not listening for Zipkin HTTP traffic, port not configured")
return nil, nil
}
params.Logger.Info("Listening for Zipkin HTTP traffic", zap.String("zipkin host-port", params.HostPort))
listener, err := net.Listen("tcp", params.HostPort)
if err != nil {
return nil, err
}
errorLog, _ := zap.NewStdLogAt(params.Logger, zapcore.ErrorLevel)
server := &http.Server{
Addr: params.HostPort,
ErrorLog: errorLog,
ReadHeaderTimeout: 2 * time.Second,
}
if params.TLSConfig.Enabled {
tlsCfg, err := params.TLSConfig.Config(params.Logger) // This checks if the certificates are correctly provided
if err != nil {
return nil, err
}
server.TLSConfig = tlsCfg
}
serveZipkin(server, listener, params)
return server, nil
}
func serveZipkin(server *http.Server, listener net.Listener, params *ZipkinServerParams) {
r := mux.NewRouter()
zHandler := zipkin.NewAPIHandler(params.Handler)
zHandler.RegisterRoutes(r)
origins := strings.Split(strings.ReplaceAll(params.AllowedOrigins, " ", ""), ",")
headers := strings.Split(strings.ReplaceAll(params.AllowedHeaders, " ", ""), ",")
cors := cors.New(cors.Options{
AllowedOrigins: origins,
AllowedMethods: []string{"POST"}, // Allowing only POST, because that's the only handled one
AllowedHeaders: headers,
})
recoveryHandler := recoveryhandler.NewRecoveryHandler(params.Logger, true)
server.Handler = cors.Handler(httpmetrics.Wrap(recoveryHandler(r), params.MetricsFactory, params.Logger))
go func(listener net.Listener, server *http.Server) {
var err error
if params.TLSConfig.Enabled {
err = server.ServeTLS(listener, "", "")
} else {
err = server.Serve(listener)
}
if err != nil {
if err != http.ErrServerClosed {
params.Logger.Error("Could not launch Zipkin server", zap.Error(err))
}
}
params.HealthCheck.Set(healthcheck.Unavailable)
}(listener, server)
}