/
grpc.go
82 lines (70 loc) · 2.11 KB
/
grpc.go
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package main
import (
"context"
"log"
"net"
"net/url"
"sync"
grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
divider "goa.design/examples/error/gen/divider"
dividerpb "goa.design/examples/error/gen/grpc/divider/pb"
dividersvr "goa.design/examples/error/gen/grpc/divider/server"
grpcmdlwr "goa.design/goa/grpc/middleware"
"goa.design/goa/middleware"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
)
// handleGRPCServer starts configures and starts a gRPC server on the given
// URL. It shuts down the server if any error is received in the error channel.
func handleGRPCServer(ctx context.Context, u *url.URL, dividerEndpoints *divider.Endpoints, wg *sync.WaitGroup, errc chan error, logger *log.Logger, debug bool) {
// Setup goa log adapter.
var (
adapter middleware.Logger
)
{
adapter = middleware.NewLogger(logger)
}
// Wrap the endpoints with the transport specific layers. The generated
// server packages contains code generated from the design which maps
// the service input and output data structures to gRPC requests and
// responses.
var (
dividerServer *dividersvr.Server
)
{
dividerServer = dividersvr.New(dividerEndpoints, nil)
}
// Initialize gRPC server with the middleware.
srv := grpc.NewServer(
grpcmiddleware.WithUnaryServerChain(
grpcmdlwr.UnaryRequestID(),
grpcmdlwr.UnaryServerLog(adapter),
),
)
// Register the servers.
dividerpb.RegisterDividerServer(srv, dividerServer)
for svc, info := range srv.GetServiceInfo() {
for _, m := range info.Methods {
logger.Printf("serving gRPC method %s", svc+"/"+m.Name)
}
}
// Register the server reflection service on the server.
// See https://grpc.github.io/grpc/core/md_doc_server-reflection.html.
reflection.Register(srv)
(*wg).Add(1)
go func() {
defer (*wg).Done()
// Start gRPC server in a separate goroutine.
go func() {
lis, err := net.Listen("tcp", u.Host)
if err != nil {
errc <- err
}
logger.Printf("gRPC server listening on %q", u.Host)
errc <- srv.Serve(lis)
}()
<-ctx.Done()
logger.Printf("shutting down gRPC server at %q", u.Host)
srv.Stop()
}()
}