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server.go
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server.go
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package server
import (
"context"
"fmt"
"github.com/hopeio/cherry/context/httpctx"
httpi "github.com/hopeio/cherry/utils/net/http"
"github.com/hopeio/cherry/utils/net/http/grpc/gateway/runtime"
"github.com/hopeio/cherry/utils/net/http/grpc/web"
stringsi "github.com/hopeio/cherry/utils/strings"
"github.com/quic-go/quic-go"
"github.com/rs/cors"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel/trace"
"net"
"net/http"
"os/signal"
"runtime/debug"
"strings"
"syscall"
"github.com/99designs/gqlgen/graphql"
"github.com/gin-gonic/gin"
"github.com/hopeio/cherry/utils/log"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
"go.uber.org/zap"
"golang.org/x/net/http2/h2c"
"google.golang.org/grpc"
)
type Server struct {
Config *Config
// 注册 grpc 服务
GrpcHandler func(*grpc.Server)
// 注册 grpc-gateway 服务
GatewayHandler runtime.GatewayHandler
// 注册 gin 服务
GinHandler func(*gin.Engine)
// 注册 graphql 服务
GraphqlHandler graphql.ExecutableSchema
// 各种钩子函数
OnBeforeStart func(context.Context)
OnAfterStart func(context.Context)
OnBeforeStop func(context.Context)
OnAfterStop func(context.Context)
}
func NewServer(config *Config, ginhandler func(*gin.Engine), grpchandler func(*grpc.Server), gatewayhandler runtime.GatewayHandler, graphqlhandler graphql.ExecutableSchema) *Server {
return &Server{
Config: config,
GinHandler: ginhandler,
GrpcHandler: grpchandler,
GatewayHandler: gatewayhandler,
GraphqlHandler: graphqlhandler,
}
}
func Start(s *Server) {
s.Start()
}
func (s *Server) Start() {
if s.Config == nil {
s.Config = defaultServerConfig()
}
baseCtx := context.Background()
if s.Config.BaseContext != nil {
baseCtx = s.Config.BaseContext()
if baseCtx == nil {
log.Fatal("BaseContext returned a nil context")
}
}
// Handle SIGINT (CTRL+C) gracefully.
sigCtx, stop := signal.NotifyContext(baseCtx, // kill -SIGINT XXXX 或 Ctrl+c
syscall.SIGINT, // register that too, it should be ok
// os.Kill等同于syscall.Kill
syscall.SIGKILL, // register that too, it should be ok
// kill -SIGTERM XXXX
syscall.SIGTERM,
)
defer stop()
if s.OnBeforeStart != nil {
s.OnBeforeStart(sigCtx)
}
grpcServer := s.grpcHandler()
httpHandler := s.httpHandler()
// cors
if s.Config.EnableCors {
var corsServer *cors.Cors
if s.Config.Cors == nil {
corsServer = cors.AllowAll()
} else {
corsServer = cors.New(*s.Config.Cors)
}
httpHandler = corsServer.Handler(httpHandler).(http.HandlerFunc)
}
// grpc-web
var wrappedGrpc *web.WrappedGrpcServer
if s.Config.EnableGrpcWeb {
wrappedGrpc = web.WrapServer(grpcServer, s.Config.GrpcWebOption...)
}
enableTracing := s.Config.EnableTracing
//systemTracing := serviceConfig.SystemTracing
if enableTracing {
grpc.EnableTracing = true
// Set up OpenTelemetry.
otelShutdown, err := setupOTelSDK(sigCtx, enableTracing)
if err != nil {
log.Fatal(err)
}
// Handle shutdown properly so nothing leaks.
defer func() {
err = otelShutdown(context.Background())
if err != nil {
log.Error(err)
}
}()
}
var handler http.Handler
handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Errorw(fmt.Sprintf("panic: %v", err), zap.String(log.FieldStack, stringsi.BytesToString(debug.Stack())))
w.Header().Set(httpi.HeaderContentType, httpi.ContentJsonHeaderValue)
_, err := w.Write(httpi.ResponseSysErr)
if err != nil {
log.Error(err)
}
}
}()
// 简单的中间件支持
for _, middleware := range s.Config.Middlewares {
middleware(w, r)
}
ctx, span := httpctx.ContextFromRequest(httpctx.RequestCtx{Request: r, Response: w}, enableTracing)
r = r.WithContext(ctx.ContextWrapper())
contentType := r.Header.Get(httpi.HeaderContentType)
if strings.HasPrefix(contentType, httpi.ContentGrpcHeaderValue) {
if strings.HasPrefix(contentType[len(httpi.ContentGrpcHeaderValue):], "-web") && wrappedGrpc != nil {
wrappedGrpc.ServeHTTP(w, r)
} else if r.ProtoMajor == 2 && grpcServer != nil {
grpcServer.ServeHTTP(w, r) // gRPC Server
}
} else {
httpHandler.ServeHTTP(w, r)
}
if span != nil {
span.End()
}
})
if enableTracing {
http.DefaultClient = otelhttp.DefaultClient
handlerBack := handler
handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
apiCounter.Add(r.Context(), 1)
attr := semconv.HTTPRouteKey.String(r.RequestURI)
span := trace.SpanFromContext(r.Context())
span.SetAttributes(attr)
labeler, _ := otelhttp.LabelerFromContext(r.Context())
labeler.Add(attr)
handlerBack.ServeHTTP(w, r)
})
handler = otelhttp.NewHandler(handler, "server")
}
server := &s.Config.Http
server.BaseContext = func(_ net.Listener) context.Context {
return sigCtx
}
// 为了提供grpc服务,默认启用http2
h2Handler := h2c.NewHandler(handler, &s.Config.Http2)
server.Handler = h2Handler
// 服务注册
//initialize.GlobalConfig().Register()
srvErr := make(chan error, 1)
if s.Config.Http3 != nil && s.Config.Http3.TLSConfig != nil {
s.Config.Http3.Handler = handler
s.Config.Http3.ConnContext = func(ctx context.Context, c quic.Connection) context.Context {
return sigCtx
}
go func() {
log.Infof("http3 listening: %s", s.Config.Http3.Addr)
srvErr <- s.Config.Http3.ListenAndServe()
}()
}
go func() {
log.Infof("listening: %s", s.Config.Http.Addr)
srvErr <- server.ListenAndServe()
}()
if s.OnAfterStart != nil {
s.OnAfterStart(sigCtx)
}
// Wait for interruption.
select {
case err := <-srvErr:
// Error when starting HTTP server.
log.Fatalf("failed to serve: %v", err)
case <-sigCtx.Done():
// Wait for first CTRL+C.
// Stop receiving signal notifications as soon as possible.
stop()
log.Debug("stop server")
}
if s.OnBeforeStop != nil {
s.OnBeforeStop(sigCtx)
}
//服务关闭
if grpcServer != nil {
grpcServer.GracefulStop()
}
if err := server.Shutdown(context.Background()); err != nil {
log.Error(err)
}
if s.OnAfterStop != nil {
s.OnAfterStop(sigCtx)
}
}