/
server.go
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/
server.go
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package yolo
import (
"context"
"crypto/subtle"
fmt "fmt"
"net"
"net/http"
"strings"
"time"
"github.com/go-chi/chi"
"github.com/go-chi/chi/middleware"
"github.com/go-chi/jsonp"
packr "github.com/gobuffalo/packr/v2"
"github.com/gogo/gateway"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
grpc_recovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/oklog/run"
"github.com/rs/cors"
chilogger "github.com/treastech/logger"
"go.uber.org/zap"
"google.golang.org/grpc"
"moul.io/depviz/v3/pkg/chiutil"
)
type Server struct {
workers run.Group
logger *zap.Logger
grpcServer *grpc.Server
grpcListenerAddr string
httpListenerAddr string
}
type ServerOpts struct {
Logger *zap.Logger
HTTPBind string
GRPCBind string
CORSAllowedOrigins string
RequestTimeout time.Duration
ShutdownTimeout time.Duration
BasicAuth string
Realm string
}
func NewServer(ctx context.Context, svc Service, opts ServerOpts) (*Server, error) {
if opts.Logger == nil {
opts.Logger = zap.NewNop()
}
if opts.HTTPBind == "" {
opts.HTTPBind = ":0"
}
if opts.GRPCBind == "" {
opts.GRPCBind = ":0"
}
if opts.Realm == "" {
opts.Realm = "Yolo"
}
// gRPC internal server
srv := Server{
logger: opts.Logger,
}
serverStreamOpts := []grpc.StreamServerInterceptor{
grpc_recovery.StreamServerInterceptor(),
grpc_zap.StreamServerInterceptor(srv.logger),
grpc_recovery.StreamServerInterceptor(),
}
serverUnaryOpts := []grpc.UnaryServerInterceptor{
grpc_recovery.UnaryServerInterceptor(),
grpc_zap.UnaryServerInterceptor(srv.logger),
grpc_recovery.UnaryServerInterceptor(),
}
srv.grpcServer = grpc.NewServer(
grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(serverStreamOpts...)),
grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(serverUnaryOpts...)),
)
RegisterYoloServiceServer(srv.grpcServer, svc)
// gRPC exposed server
grpcListener, err := net.Listen("tcp", opts.GRPCBind)
if err != nil {
return nil, err
}
srv.grpcListenerAddr = grpcListener.Addr().String()
srv.workers.Add(func() error {
srv.logger.Info("starting gRPC server", zap.String("bind", srv.grpcListenerAddr))
return srv.grpcServer.Serve(grpcListener)
}, func(_ error) {
if err := grpcListener.Close(); err != nil {
srv.logger.Warn("close gRPC listener", zap.Error(err))
}
})
// HTTP exposed server
r := chi.NewRouter()
if opts.CORSAllowedOrigins != "" {
cors := cors.New(cors.Options{
AllowedOrigins: strings.Split(opts.CORSAllowedOrigins, ","),
AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
ExposedHeaders: []string{"Link"},
AllowCredentials: true,
MaxAge: 300,
})
r.Use(cors.Handler)
}
r.Use(chilogger.Logger(srv.logger))
r.Use(middleware.Timeout(opts.RequestTimeout))
r.Use(middleware.Recoverer)
if opts.BasicAuth != "" {
r.Use(basicAuth(opts.BasicAuth, opts.Realm))
}
gwmux := runtime.NewServeMux(
runtime.WithMarshalerOption(runtime.MIMEWildcard, &gateway.JSONPb{EmitDefaults: false, Indent: " ", OrigName: true}),
runtime.WithProtoErrorHandler(runtime.DefaultHTTPProtoErrorHandler),
)
grpcDialOpts := []grpc.DialOption{grpc.WithInsecure()}
if err := RegisterYoloServiceHandlerFromEndpoint(ctx, gwmux, srv.grpcListenerAddr, grpcDialOpts); err != nil {
return nil, err
}
var handler http.Handler = gwmux
r.Route("/api", func(r chi.Router) {
r.Use(jsonp.Handler)
r.Mount("/", http.StripPrefix("/api", handler))
r.Get("/plist-gen/{artifactID}.plist", svc.PlistGenerator)
r.Get("/artifact-dl", svc.ArtifactDownloader)
})
box := packr.New("web", "./web")
chiutil.FileServer(r, "/", box)
httpListener, err := net.Listen("tcp", opts.HTTPBind)
if err != nil {
return nil, err
}
srv.httpListenerAddr = httpListener.Addr().String()
httpServer := http.Server{Handler: r}
srv.workers.Add(func() error {
srv.logger.Info("starting HTTP server", zap.String("bind", srv.httpListenerAddr))
return httpServer.Serve(httpListener)
}, func(_ error) {
ctx, cancel := context.WithTimeout(ctx, opts.ShutdownTimeout)
if err := httpServer.Shutdown(ctx); err != nil {
srv.logger.Warn("shutdown HTTP server", zap.Error(err))
}
defer cancel()
if err := httpListener.Close(); err != nil {
srv.logger.Warn("close HTTP listener", zap.Error(err))
}
})
return &srv, nil
}
func (srv *Server) Start() error {
return srv.workers.Run()
}
func (srv *Server) Stop() {
srv.grpcServer.GracefulStop()
}
func basicAuth(basicAuth string, realm string) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, password, ok := r.BasicAuth()
if !ok || subtle.ConstantTimeCompare([]byte(password), []byte(basicAuth)) != 1 {
w.Header().Add("WWW-Authenticate", fmt.Sprintf(`Basic realm="%s"`, realm))
w.WriteHeader(http.StatusUnauthorized)
fmt.Fprintf(w, "invalid credentials\n")
return
}
next.ServeHTTP(w, r)
})
}
}