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grpc_server.go
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grpc_server.go
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package ps121
import (
"context"
"net"
"github.com/mniak/ps121/internal/noop"
"github.com/mniak/ps121/log2"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type ConnectionHandler interface {
HandleConnection(ctx context.Context, method string, serverStream Stream) error
}
type GRPCServer struct {
ConnectionHandler ConnectionHandler
Logger log2.Logger
listener net.Listener
runError error
server *grpc.Server
}
func (self *GRPCServer) init() {
if self.Logger == nil {
self.Logger = noop.Logger()
}
}
func (p *GRPCServer) Start(addr string) error {
var err error
p.listener, err = net.Listen("tcp", addr)
if err != nil {
return err
}
return p.StartWithListener(p.listener)
}
func (self *GRPCServer) StartWithListener(lis net.Listener) error {
self.init()
self.listener = lis
self.runAsync()
return nil
}
func (self *GRPCServer) runAsync() {
self.runError = nil
go func() {
self.runError = self.run()
if self.runError != nil {
self.Logger.Printf("Run failed with error: %s", self.runError)
}
}()
}
func (self *GRPCServer) run() error {
self.server = grpc.NewServer(grpc.UnknownServiceHandler(self.onConnectionAccepted))
self.server.RegisterService(&grpc.ServiceDesc{
ServiceName: "DummyService",
HandlerType: (*any)(nil),
}, nil)
err := self.server.Serve(self.listener)
if err != nil {
return err
}
return nil
}
func (self *GRPCServer) GracefulStop() {
if self.server != nil {
self.server.GracefulStop()
self.server = nil
}
}
func (self *GRPCServer) onConnectionAccepted(_ any, protoServer grpc.ServerStream) error {
ctx := protoServer.Context()
method, hasName := grpc.MethodFromServerStream(protoServer)
if !hasName {
return status.Errorf(codes.NotFound, "Method name could not be determined")
}
self.Logger.Printf("Handling method %s", method)
defer self.Logger.Printf("Done handling method %s", method)
ctx = copyHeadersFromIncomingToOutcoming(ctx, ctx)
serverStream := StreamsFromProtobuf(protoServer)
return self.ConnectionHandler.HandleConnection(ctx, method, serverStream)
}