vendor: bump grpc to v1.27.1

Gopkg.toml

@@ -30,6 +30,7 @@ noverify = [
 ignored = [
   # Non-existent package used by a toy program in c-deps/protobuf.
   "github.com/google/protobuf/examples/tutorial",
+  "github.com/cockroachdb/cockroach/c-deps/protobuf/benchmarks/go",
 ]
 
 [[constraint]]
@@ -115,6 +116,16 @@ ignored = [
   name = "golang.org/x/crypto"
   branch = "master"
 
+[[constraint]]
+  # This package should be replaced for google.golang.org/protobuf,
+  # but we (and various deps including etcd) continue to use this
+  # one. We require v1.4+.
+  # The package is a wrapper around the suggested replacement
+  # (google.golang.org/protobuf) so there's no pressing reason
+  # to do anything.
+  name = "github.com/golang/protobuf"
+  version = "=v1.4.1"
+
 [[constraint]]
   name = "github.com/gogo/protobuf"
   source = "https://github.com/cockroachdb/gogoproto"
@@ -157,7 +168,19 @@ ignored = [
 
 [[constraint]]
   name = "google.golang.org/grpc"
-  version = "=v1.21.2"
+  version = "=v1.27.1"
+
+[[constraint]]
+  # The grpc-gateway protoc plugin prints warnings whenever
+  # you have a gRPC service without a HttpRule. We have a number
+  # of those (and it's totally reasonable to).
+  # For the time being, we use a fork that has the warning removed.
+  # See:
+  # https://github.com/grpc-ecosystem/grpc-gateway/commit/ee513453fd80ce577c1a680b14300458072dad5e
+  # https://github.com/uber/prototool/issues/128
+  name = "github.com/grpc-ecosystem/grpc-gateway"
+  branch = "v1.14.5-nowarning"
+  source = "https://github.com/cockroachdb/grpc-gateway"
 
 [prune]
   go-tests = true

pkg/cli/error.go

@@ -299,7 +299,8 @@ func MaybeDecorateGRPCError(
 			if reGRPCAuthFailure.MatchString(msg) {
 				return connSecurityHint()
 			}
-			if reGRPCConnFailed.MatchString(msg) {
+			if reGRPCConnFailed.MatchString(msg) /* gRPC 1.21 */ ||
+				status.Code(errors.Cause(err)) == codes.Unavailable /* gRPC 1.27 */ {
 				return connRefused()
 			}
 

pkg/rpc/context.go

@@ -43,6 +43,7 @@ import (
 	opentracing "github.com/opentracing/opentracing-go"
 	"golang.org/x/sync/syncmap"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/encoding"
 	encodingproto "google.golang.org/grpc/encoding/proto"
@@ -898,7 +899,11 @@ func (ctx *Context) grpcDialRaw(
 	// Add a stats handler to measure client network stats.
 	dialOpts = append(dialOpts, grpc.WithStatsHandler(ctx.stats.newClient(target)))
 
-	dialOpts = append(dialOpts, grpc.WithBackoffMaxDelay(maxBackoff))
+	// Lower the MaxBackoff (which defaults to ~minutes) to something in the
+	// ~second range.
+	backoffConfig := backoff.DefaultConfig
+	backoffConfig.MaxDelay = maxBackoff
+	dialOpts = append(dialOpts, grpc.WithConnectParams(grpc.ConnectParams{Backoff: backoffConfig}))
 	dialOpts = append(dialOpts, grpc.WithKeepaliveParams(clientKeepalive))
 	dialOpts = append(dialOpts,
 		grpc.WithInitialWindowSize(initialWindowSize),