/
server.go
169 lines (140 loc) · 3.66 KB
/
server.go
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/*
Inspired by
- https://github.com/Stoakes/grpc-gateway-example
*/
package server2
import (
"context"
"fmt"
"io"
"mime"
"net"
"net/http"
"strings"
"time"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
assetfs "github.com/philips/go-bindata-assetfs"
"github.com/soheilhy/cmux"
"google.golang.org/grpc"
"github.com/tangfeixiong/go-to-docker/pb"
"github.com/tangfeixiong/go-to-docker/pkg/dockerclient"
"github.com/tangfeixiong/go-to-docker/pkg/ui/data/swagger"
)
type MicroServer struct {
host string
lstn net.Listener
httpServer *http.Server
grpcServer *grpc.Server
config *Config
DockerClient *dockerclient.DockerClient
}
func Start(opt *Option) {
cfg := NewConfig()
conn, err := net.Listen("tcp", fmt.Sprintf(":%d", cfg.Port))
if err != nil {
panic(err)
}
defer conn.Close()
s := New(fmt.Sprint(":%d", cfg.Port), conn)
s.config = cfg
s.DockerClient = dockerclient.NewOrDie()
if err = s.Start(); err != nil {
panic(err)
}
}
func New(addr string, l net.Listener) *MicroServer {
return &MicroServer{
host: addr,
lstn: l,
}
}
func (ms *MicroServer) Start() error {
var err error
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
tcpMux := cmux.New(ms.lstn)
grpcL := tcpMux.MatchWithWriters(cmux.HTTP2MatchHeaderFieldPrefixSendSettings("content-type", "application/grpc"))
httpL := tcpMux.Match(cmux.HTTP1Fast())
ms.grpcServer, err = newGRPC(ctx, ms)
if err != nil {
panic(err)
}
ms.httpServer, err = newHTTP(ctx, ms.host, ms.config.Port)
if err != nil {
panic(err)
}
go func() {
if err := ms.grpcServer.Serve(grpcL); err != nil {
panic(err)
}
}()
go func() {
if err := ms.httpServer.Serve(httpL); err != nil {
panic(err)
}
}()
return tcpMux.Serve()
}
func newGRPC(ctx context.Context, ms *MicroServer) (*grpc.Server, error) {
grpcServer := grpc.NewServer()
pb.RegisterSimpleServiceServer(grpcServer, ms)
return grpcServer, nil
}
func newHTTP(ctx context.Context, host string, port int) (*http.Server, error) {
router := http.NewServeMux()
router.HandleFunc("/swagger.json", func(w http.ResponseWriter, req *http.Request) {
io.Copy(w, strings.NewReader(pb.Swagger))
})
serveSwagger(router)
serveReSTful(router)
// initialize grpc-gateway
gw, err := newGateway(ctx, fmt.Sprintf("localhost:%d", port))
if err != nil {
return nil, err
}
router.Handle("/", gw)
return &http.Server{
Addr: host,
Handler: router,
// ReadTimeout: 5 * time.Second,
// WriteTimeout: 10 * time.Second,
// IdleTimeout: 120 * time.Second,
}, nil
}
func newGateway(ctx context.Context, host string) (http.Handler, error) {
opts := []grpc.DialOption{
grpc.WithTimeout(10 * time.Second),
grpc.WithBlock(),
grpc.WithInsecure(),
}
conn, err := grpc.Dial(host, opts...)
if err != nil {
fmt.Printf("Failed to dial: %v\n", err)
return nil, err
}
// gwMux := runtime.NewServerMux()
// Change JSON serializer to include empty fields with default values
gwMux := runtime.NewServeMux(
runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{
OrigName: true,
EmitDefaults: true}),
runtime.WithProtoErrorHandler(runtime.DefaultHTTPProtoErrorHandler),
)
err = pb.RegisterSimpleServiceHandler(ctx, gwMux, conn)
if err != nil {
fmt.Printf("Unable to instantiate gRPC Gateway: %v", err)
return nil, err
}
return gwMux, nil
}
func serveSwagger(mux *http.ServeMux) {
mime.AddExtensionType(".svg", "image/svg+xml")
fileServer := http.FileServer(&assetfs.AssetFS{
Asset: swagger.Asset,
AssetDir: swagger.AssetDir,
Prefix: "third_party/swagger-ui",
})
prefix := "/swagger-ui/"
mux.Handle(prefix, http.StripPrefix(prefix, fileServer))
}