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|
/*Package praefect is a Gitaly reverse proxy for transparently routing gRPC
calls to a set of Gitaly services.*/
package praefect
import (
"context"
"net"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitaly/internal/middleware/cancelhandler"
"gitlab.com/gitlab-org/gitaly/internal/middleware/metadatahandler"
"gitlab.com/gitlab-org/gitaly/internal/middleware/panichandler"
"gitlab.com/gitlab-org/gitaly/internal/praefect/grpc-proxy/proxy"
"gitlab.com/gitlab-org/gitaly/internal/server/auth"
grpccorrelation "gitlab.com/gitlab-org/labkit/correlation/grpc"
grpctracing "gitlab.com/gitlab-org/labkit/tracing/grpc"
"google.golang.org/grpc"
)
// Server is a praefect server
type Server struct {
coordinator *Coordinator
repl ReplMgr
s *grpc.Server
}
// NewServer returns an initialized praefect gPRC proxy server configured
// with the provided gRPC server options
func NewServer(c *Coordinator, repl ReplMgr, grpcOpts []grpc.ServerOption, l *logrus.Entry) *Server {
grpcOpts = append(grpcOpts, proxyRequiredOpts(c.streamDirector)...)
grpcOpts = append(grpcOpts, []grpc.ServerOption{
grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(
grpccorrelation.StreamServerCorrelationInterceptor(), // Must be above the metadata handler
grpc_prometheus.StreamServerInterceptor,
cancelhandler.Stream, // Should be below LogHandler
grpctracing.StreamServerTracingInterceptor(),
auth.StreamServerInterceptor(),
// Panic handler should remain last so that application panics will be
// converted to errors and logged
panichandler.StreamPanicHandler,
)),
grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
grpccorrelation.UnaryServerCorrelationInterceptor(), // Must be above the metadata handler
metadatahandler.UnaryInterceptor,
grpc_prometheus.UnaryServerInterceptor,
cancelhandler.Unary, // Should be below LogHandler
grpctracing.UnaryServerTracingInterceptor(),
auth.UnaryServerInterceptor(),
// Panic handler should remain last so that application panics will be
// converted to errors and logged
panichandler.UnaryPanicHandler,
)),
}...)
return &Server{
s: grpc.NewServer(grpcOpts...),
coordinator: c,
repl: repl,
}
}
func proxyRequiredOpts(director proxy.StreamDirector) []grpc.ServerOption {
return []grpc.ServerOption{
grpc.CustomCodec(proxy.Codec()),
grpc.UnknownServiceHandler(proxy.TransparentHandler(director)),
}
}
// Start will start the praefect gRPC proxy server listening at the provided
// listener. Function will block until the server is stopped or an
// unrecoverable error occurs.
func (srv *Server) Start(lis net.Listener) error {
return srv.s.Serve(lis)
}
// Shutdown will attempt a graceful shutdown of the grpc server. If unable
// to gracefully shutdown within the context deadline, it will then
// forcefully shutdown the server and return a context cancellation error.
func (srv *Server) Shutdown(ctx context.Context) error {
done := make(chan struct{})
go func() {
srv.s.GracefulStop()
close(done)
}()
select {
case <-ctx.Done():
srv.s.Stop()
return ctx.Err()
case <-done:
return nil
}
}
|
