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grpc.go
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grpc.go
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package main
import (
"context"
"log"
"net"
"net/url"
"sync"
grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
chattersvc "goa.design/examples/streaming/gen/chatter"
chatterpb "goa.design/examples/streaming/gen/grpc/chatter/pb"
chattersvcsvr "goa.design/examples/streaming/gen/grpc/chatter/server"
grpcmdlwr "goa.design/goa/grpc/middleware"
"goa.design/goa/middleware"
"google.golang.org/grpc"
)
// 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, chatterEndpoints *chattersvc.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 (
chatterServer *chattersvcsvr.Server
)
{
chatterServer = chattersvcsvr.New(chatterEndpoints, nil, nil)
}
// Initialize gRPC server with the middleware.
srv := grpc.NewServer(
grpcmiddleware.WithUnaryServerChain(
grpcmdlwr.UnaryRequestID(),
grpcmdlwr.UnaryServerLog(adapter),
),
grpcmiddleware.WithStreamServerChain(
grpcmdlwr.StreamCanceler(ctx),
grpcmdlwr.StreamRequestID(),
grpcmdlwr.StreamServerLog(adapter),
),
)
// Register the servers.
chatterpb.RegisterChatterServer(srv, chatterServer)
for svc, info := range srv.GetServiceInfo() {
for _, m := range info.Methods {
logger.Printf("serving gRPC method %s", svc+"/"+m.Name)
}
}
(*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.GracefulStop()
}()
}