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server.go
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server.go
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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log/slog"
"net"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/prometheus/client_golang/prometheus"
"github.com/swaggest/swgui/v5emb"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/server/v3/proxy/grpcproxy"
"go.uber.org/zap"
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/reflection"
"github.com/kelein/cookbook/govoyage/assets"
"github.com/kelein/cookbook/govoyage/pbgen"
"github.com/kelein/cookbook/govoyage/pkg/middleware"
"github.com/kelein/cookbook/govoyage/pkg/tracer"
"github.com/kelein/cookbook/govoyage/pkg/version"
"github.com/kelein/cookbook/govoyage/service"
)
const (
contentHeader = "Content-Type"
contentTypeGRPC = "application/grpc"
)
var (
v = flag.Bool("v", false, "show build version")
vs = flag.Bool("version", false, "show build version")
port = flag.Int("port", 8080, "server listen port")
etcdAddr = flag.String("etcd-addr", "127.0.0.1:2379", "etcd server address")
traceUIPort = flag.Int("trace-ui-port", 8090, "trace collector UI port")
serverAddr = fmt.Sprintf("0.0.0.0:%d", *port)
)
var (
serviceName = version.AppName
apiDocName = version.AppName
apiDocPath = "/api/v1/docs/"
)
func init() {
replace := func(groups []string, a slog.Attr) slog.Attr {
// Remove the directory from the source's filename.
if a.Key == slog.SourceKey {
source := a.Value.Any().(*slog.Source)
source.File = filepath.Base(source.File)
}
return a
}
// * Text Log Format
logger := slog.New(slog.NewTextHandler(
os.Stdout, &slog.HandlerOptions{
AddSource: true,
ReplaceAttr: replace,
},
))
slog.SetDefault(logger)
// * Register Prometheus Metrics Collector
prometheus.MustRegister(version.NewCollector(version.AppName))
}
func main() {
flag.Parse()
showVersion()
slog.Info("server build info", "version", version.Version, "branch",
version.Branch, "revision", version.Revision, "buildUser",
version.BuildUser, "buildDate", version.BuildDate)
slog.Info("server start listen on", "addr", serverAddr)
// if err := tracer.SetupTracer(); err != nil {
// slog.Error("opentracing setup failed", "error", err)
// os.Exit(1)
// }
collectorAddr, err := tracer.SetupCollectorServer()
if err != nil {
slog.Error("jaeger collector setup failed", "error", err)
os.Exit(1)
}
tracer.SetTracerWithCollector(collectorAddr)
if err := tracer.SetupCollectorUI(*traceUIPort); err != nil {
slog.Error("jaeger collector UI setup failed", "error", err)
os.Exit(1)
}
if err := RunMultiServer(serverAddr); err != nil {
slog.Error("server start failed", "addr", serverAddr, "error", err)
os.Exit(1)
}
}
// mainV1 test unary and stream gRPC server
func mainV1() {
flag.Parse()
slog.Info("server start listen on", "port", *port)
server := grpc.NewServer()
tager := service.NewTagService()
greeter := service.NewGreeterService()
pbgen.RegisterGreeterServer(server, greeter)
pbgen.RegisterTagServiceServer(server, tager)
// * Registe and grpcurl can test it
reflection.Register(server)
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
slog.Error("server listen failed", "error", err)
}
server.Serve(listener)
}
// mainV2 test Swagger UI embedded
func mainV2() {
// * Register static OpenAPI yaml file
http.Handle(assets.OpenAPIFilePath, http.FileServer(http.FS(assets.OpenAPIFile)))
slog.Info("server openAPI file", "path", assets.OpenAPIFilePath)
// * Register swagger UI and docs
http.Handle(apiDocPath, v5emb.New(apiDocName, assets.OpenAPIFilePath, apiDocPath))
slog.Info("server openAPI docs", "path", apiDocPath)
// * Register index handler
http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
writer.Write([]byte("Hello Govoyage!"))
})
slog.Info("server start listen on", "addr", serverAddr)
http.ListenAndServe(serverAddr, http.DefaultServeMux)
}
// RunMultiServer start both http and grpc server on the same port
func RunMultiServer(addr string) error {
httpServer := runHTTPServer()
grpcServer := runGRPCServer()
gatewayServer := runGRPCGateway(addr)
httpServer.Handle("/", gatewayServer)
// * Register service endpoints
if err := registerService(addr); err != nil {
slog.Error("register service failed", "error", err)
return err
}
return http.ListenAndServe(addr, grpcHandlerFunc(grpcServer, httpServer))
}
// registerService register the service into etcd
func registerService(addr string) error {
etcdcli, err := clientv3.New(clientv3.Config{
Endpoints: []string{*etcdAddr},
DialTimeout: time.Second * 60,
})
if err != nil {
slog.Error("connect etcd failed", "addr", etcdAddr, "error", err)
return err
}
defer etcdcli.Close()
slog.Info("etcd client info", "endpoints", etcdcli.Endpoints())
logger, err := zap.NewProduction()
if err != nil {
slog.Error("initial zap logger failed", "error", err)
return err
}
prefix := fmt.Sprintf("/etcdv3://registry/service/grpc/%s", serviceName)
grpcproxy.Register(logger, etcdcli, prefix, addr, 60)
return nil
}
// runHTTPServer starts a http server via grpc-gateway
func runHTTPServer() *http.ServeMux {
mux := http.NewServeMux()
// * Register index handler
mux.HandleFunc("/index", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(index))
})
slog.Info("server home index", "path", "/index")
// * Register server runtime version info
mux.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
info, err := json.Marshal(version.Runtime())
if err != nil {
w.Write([]byte(err.Error()))
return
}
w.Write(info)
})
// * Register heart beat endpoint
mux.HandleFunc("/ping", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`{"message": "HTTP server is running!"}`))
})
// * Register static OpenAPI yaml file
mux.Handle(assets.OpenAPIFilePath, http.FileServer(http.FS(assets.OpenAPIFile)))
slog.Info("server openAPI file", "path", assets.OpenAPIFilePath)
// * Register swagger UI and docs
mux.Handle(apiDocPath, v5emb.New(apiDocName, assets.OpenAPIFilePath, apiDocPath))
slog.Info("server openAPI docs", "path", apiDocPath)
// * Register Pprof endpoint
middleware.NewProfiler().Register(mux)
return mux
}
// runGRPCServer start a grpc server
func runGRPCServer() *grpc.Server {
opts := []grpc.ServerOption{
grpc.ChainUnaryInterceptor(
middleware.LogInterceptor,
middleware.NopInterceptor,
middleware.LoggingInterceptor(),
middleware.ServerTraceInterceptor(),
),
}
server := grpc.NewServer(opts...)
tager := service.NewTagService()
greeter := service.NewGreeterService()
pbgen.RegisterGreeterServer(server, greeter)
pbgen.RegisterTagServiceServer(server, tager)
// * Registe and grpcurl can test it
reflection.Register(server)
return server
}
// runGRPCGateway start a grpc gateway server
func runGRPCGateway(addr string) *runtime.ServeMux {
mux := runtime.NewServeMux()
opts := []grpc.DialOption{
grpc.WithTransportCredentials(
insecure.NewCredentials(),
),
}
pbgen.RegisterGreeterHandlerFromEndpoint(context.Background(), mux, addr, opts)
pbgen.RegisterTagServiceHandlerFromEndpoint(context.Background(), mux, addr, opts)
return mux
}
func grpcHandlerFunc(grpcServer *grpc.Server, httpServer http.Handler) http.Handler {
grpcFn := func(w http.ResponseWriter, r *http.Request) {
ctype := r.Header.Get(contentHeader)
if r.ProtoMajor == 2 && strings.Contains(ctype, contentTypeGRPC) {
slog.Info("[GRPC]", "proto", r.Proto, "method", r.Method, "path", r.URL.String())
grpcServer.ServeHTTP(w, r)
} else {
slog.Info("[HTTP]", "proto", r.Proto, "method", r.Method, "path", r.URL.String())
httpServer.ServeHTTP(w, r)
}
}
return h2c.NewHandler(http.HandlerFunc(grpcFn), &http2.Server{})
}
func showVersion() {
if *v || *vs {
fmt.Println(version.String())
os.Exit(0)
}
}
var index = `<!DOCTYPE html>
<html lang="en"><body>
<h3>Govoyage</h3>
<li><a href="/openapi.yaml">OpenAPI Yaml</a></li>
<li><a href="/api/v1/docs/">OpenAPI Docs<a></li>
</body></html>`