/
grpcxy.go
130 lines (112 loc) · 3.54 KB
/
grpcxy.go
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package cli
import (
"context"
"fmt"
"net"
"os"
"os/signal"
"strings"
"time"
"github.com/kenriortega/ngonx/pkg/errors"
"github.com/kenriortega/ngonx/pkg/logger"
"github.com/spf13/cobra"
"github.com/talos-systems/grpc-proxy/proxy"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
var director proxy.StreamDirector
var grpcCmd = &cobra.Command{
Use: "grpc",
Short: "Run ngonx as a grpc proxy",
Run: func(cmd *cobra.Command, args []string) {
var opts []grpc.ServerOption
lis, err := net.Listen("tcp", configFromYaml.GrpcProxy.Listener)
if err != nil {
logger.LogError(errors.Errorf("grpc: failed to listen: %v", err).Error())
}
logger.LogInfo(fmt.Sprintf("Proxy running at %q\n", configFromYaml.GrpcProxy.Listener))
simpleBackendGen := func(hostname string) proxy.Backend {
return &proxy.SingleBackend{
GetConn: func(ctx context.Context) (context.Context, *grpc.ClientConn, error) {
md, _ := metadata.FromIncomingContext(ctx)
outCtx := metadata.NewOutgoingContext(ctx, md.Copy())
if configFromYaml.GrpcSSL.Enable {
creds, sslErr := credentials.NewClientTLSFromFile(
configFromYaml.GrpcClientCert, "")
if sslErr != nil {
logger.LogError(errors.Errorf("grpc: failed to parse credentials: %v", sslErr).Error())
}
conn, err := grpc.DialContext(
ctx,
hostname,
grpc.WithTransportCredentials(creds),
grpc.WithCodec(proxy.Codec()),
) //nolint: staticcheck
return outCtx, conn, err
}
conn, err := grpc.DialContext(
ctx,
hostname,
grpc.WithInsecure(),
grpc.WithCodec(proxy.Codec()),
) //nolint: staticcheck
return outCtx, conn, err
},
}
}
director = func(ctx context.Context, fullMethodName string) (proxy.Mode, []proxy.Backend, error) {
for _, bkd := range configFromYaml.GrpcEndpoints {
// Make sure we never forward internal services.
if !strings.HasPrefix(fullMethodName, bkd.Name) {
return proxy.One2One, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
md, ok := metadata.FromIncomingContext(ctx)
if ok {
if _, exists := md[":authority"]; exists {
return proxy.One2One, []proxy.Backend{
simpleBackendGen(bkd.HostURI),
}, nil
}
}
}
return proxy.One2One, nil, status.Errorf(codes.Unimplemented, "Unknown method")
}
opts = append(opts,
grpc.CustomCodec(proxy.Codec()),
grpc.UnknownServiceHandler(proxy.TransparentHandler(director)),
)
// SSL
if configFromYaml.GrpcSSL.Enable {
creds, sslErr := credentials.NewServerTLSFromFile(
configFromYaml.GrpcSSL.CrtFile,
configFromYaml.GrpcSSL.KeyFile,
)
if sslErr != nil {
logger.LogError(errors.Errorf("grpc: failed to parse credentials: %v", sslErr).Error())
return
}
opts = append(opts, grpc.Creds(creds))
}
server := grpc.NewServer(opts...)
go gracefulShutdown(server)
if err := server.Serve(lis); err != nil {
logger.LogError(errors.Errorf("grpc: failed to serve: %v", err).Error())
}
},
}
func init() {
rootCmd.AddCommand(grpcCmd)
}
func gracefulShutdown(server *grpc.Server) {
quit := make(chan os.Signal, 1)
signal.Notify(quit, os.Interrupt)
sig := <-quit
logger.LogWarn(fmt.Sprintf("grpc: server is shutting down %s", sig.String()))
_, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
server.GracefulStop()
logger.LogWarn(fmt.Sprintf("grpc: server is shutting down %s", sig.String()))
}