Expand service config support

call.go

@@ -73,7 +73,10 @@ func recvResponse(ctx context.Context, dopts dialOptions, t transport.ClientTran
 		}
 	}
 	for {
-		if err = recv(p, dopts.codec, stream, dopts.dc, reply, dopts.maxMsgSize, inPayload); err != nil {
+		if c.maxReceiveMessageSize == nil {
+			return Errorf(codes.Internal, "callInfo maxReceiveMessageSize field uninitialized(nil)")
+		}
+		if err = recv(p, dopts.codec, stream, dopts.dc, reply, *c.maxReceiveMessageSize, inPayload); err != nil {
 			if err == io.EOF {
 				break
 			}
@@ -93,7 +96,7 @@ func recvResponse(ctx context.Context, dopts dialOptions, t transport.ClientTran
 }
 
 // sendRequest writes out various information of an RPC such as Context and Message.
-func sendRequest(ctx context.Context, dopts dialOptions, compressor Compressor, callHdr *transport.CallHdr, stream *transport.Stream, t transport.ClientTransport, args interface{}, opts *transport.Options) (err error) {
+func sendRequest(ctx context.Context, dopts dialOptions, compressor Compressor, c *callInfo, callHdr *transport.CallHdr, stream *transport.Stream, t transport.ClientTransport, args interface{}, opts *transport.Options) (err error) {
 	defer func() {
 		if err != nil {
 			// If err is connection error, t will be closed, no need to close stream here.
@@ -118,6 +121,12 @@ func sendRequest(ctx context.Context, dopts dialOptions, compressor Compressor,
 	if err != nil {
 		return Errorf(codes.Internal, "grpc: %v", err)
 	}
+	if c.maxSendMessageSize == nil {
+		return Errorf(codes.Internal, "callInfo maxSendMessageSize field uninitialized(nil)")
+	}
+	if len(outBuf) > *c.maxSendMessageSize {
+		return Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(outBuf), *c.maxSendMessageSize)
+	}
 	err = t.Write(stream, outBuf, opts)
 	if err == nil && outPayload != nil {
 		outPayload.SentTime = time.Now()
@@ -145,14 +154,18 @@ func Invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 
 func invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) (e error) {
 	c := defaultCallInfo
-	if mc, ok := cc.getMethodConfig(method); ok {
-		c.failFast = !mc.WaitForReady
-		if mc.Timeout > 0 {
-			var cancel context.CancelFunc
-			ctx, cancel = context.WithTimeout(ctx, mc.Timeout)
-			defer cancel()
-		}
+	mc := cc.GetMethodConfig(method)
+	if mc.WaitForReady != nil {
+		c.failFast = !*mc.WaitForReady
 	}
+
+	if mc.Timeout != nil && *mc.Timeout >= 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(ctx, *mc.Timeout)
+		defer cancel()
+	}
+
+	opts = append(cc.dopts.callOptions, opts...)
 	for _, o := range opts {
 		if err := o.before(&c); err != nil {
 			return toRPCErr(err)
@@ -163,6 +176,10 @@ func invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 			o.after(&c)
 		}
 	}()
+
+	c.maxSendMessageSize = getMaxSize(mc.MaxReqSize, c.maxSendMessageSize, defaultClientMaxSendMessageSize)
+	c.maxReceiveMessageSize = getMaxSize(mc.MaxRespSize, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)
+
 	if EnableTracing {
 		c.traceInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
 		defer c.traceInfo.tr.Finish()
@@ -260,7 +277,7 @@ func invoke(ctx context.Context, method string, args, reply interface{}, cc *Cli
 			}
 			return toRPCErr(err)
 		}
-		err = sendRequest(ctx, cc.dopts, cc.dopts.cp, callHdr, stream, t, args, topts)
+		err = sendRequest(ctx, cc.dopts, cc.dopts.cp, &c, callHdr, stream, t, args, topts)
 		if err != nil {
 			if put != nil {
 				updateRPCInfoInContext(ctx, rpcInfo{

clientconn.go

@@ -36,8 +36,8 @@ package grpc
 import (
 	"errors"
 	"fmt"
-	"math"
 	"net"
+	"strings"
 	"sync"
 	"time"
 
@@ -87,22 +87,25 @@ var (
 // dialOptions configure a Dial call. dialOptions are set by the DialOption
 // values passed to Dial.
 type dialOptions struct {
-	unaryInt   UnaryClientInterceptor
-	streamInt  StreamClientInterceptor
-	codec      Codec
-	cp         Compressor
-	dc         Decompressor
-	bs         backoffStrategy
-	balancer   Balancer
-	block      bool
-	insecure   bool
-	timeout    time.Duration
-	scChan     <-chan ServiceConfig
-	copts      transport.ConnectOptions
-	maxMsgSize int
+	unaryInt    UnaryClientInterceptor
+	streamInt   StreamClientInterceptor
+	codec       Codec
+	cp          Compressor
+	dc          Decompressor
+	bs          backoffStrategy
+	balancer    Balancer
+	block       bool
+	insecure    bool
+	timeout     time.Duration
+	scChan      <-chan ServiceConfig
+	copts       transport.ConnectOptions
+	callOptions []CallOption
 }
 
-const defaultClientMaxMsgSize = math.MaxInt32
+const (
+	defaultClientMaxReceiveMessageSize = 1024 * 1024 * 4
+	defaultClientMaxSendMessageSize    = 1024 * 1024 * 4
+)
 
 // DialOption configures how we set up the connection.
 type DialOption func(*dialOptions)
@@ -123,10 +126,15 @@ func WithInitialConnWindowSize(s int32) DialOption {
 	}
 }
 
-// WithMaxMsgSize returns a DialOption which sets the maximum message size the client can receive.
+// WithMaxMsgSize returns a DialOption which sets the maximum message size the client can receive. Deprecated: use WithDefaultCallOptions(MaxCallRecvMsgSize(s)) instead.
 func WithMaxMsgSize(s int) DialOption {
+	return WithDefaultCallOptions(MaxCallRecvMsgSize(s))
+}
+
+// WithDefaultCallOptions returns a DialOption which sets the default CallOptions for calls over the connection.
+func WithDefaultCallOptions(cos ...CallOption) DialOption {
 	return func(o *dialOptions) {
-		o.maxMsgSize = s
+		o.callOptions = append(o.callOptions, cos...)
 	}
 }
 
@@ -321,7 +329,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		conns:  make(map[Address]*addrConn),
 	}
 	cc.ctx, cc.cancel = context.WithCancel(context.Background())
-	cc.dopts.maxMsgSize = defaultClientMaxMsgSize
+
 	for _, opt := range opts {
 		opt(&cc.dopts)
 	}
@@ -359,15 +367,16 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}()
 
+	scSet := false
 	if cc.dopts.scChan != nil {
-		// Wait for the initial service config.
+		// Try to get an initial service config.
 		select {
 		case sc, ok := <-cc.dopts.scChan:
 			if ok {
 				cc.sc = sc
+				scSet = true
 			}
-		case <-ctx.Done():
-			return nil, ctx.Err()
+		default:
 		}
 	}
 	// Set defaults.
@@ -430,7 +439,17 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 			return nil, err
 		}
 	}
-
+	if cc.dopts.scChan != nil && !scSet {
+		// Blocking wait for the initial service config.
+		select {
+		case sc, ok := <-cc.dopts.scChan:
+			if ok {
+				cc.sc = sc
+			}
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
 	if cc.dopts.scChan != nil {
 		go cc.scWatcher()
 	}
@@ -640,12 +659,23 @@ func (cc *ClientConn) resetAddrConn(addr Address, block bool, tearDownErr error)
 	return nil
 }
 
-// TODO: Avoid the locking here.
-func (cc *ClientConn) getMethodConfig(method string) (m MethodConfig, ok bool) {
+// GetMethodConfig gets the method config of the input method.
+// If there's an exact match for input method (i.e. /service/method), we return
+// the corresponding MethodConfig.
+// If there isn't an exact match for the input method, we look for the default config
+// under the service (i.e /service/). If there is a default MethodConfig for
+// the serivce, we return it.
+// Otherwise, we return an empty MethodConfig.
+func (cc *ClientConn) GetMethodConfig(method string) MethodConfig {
+	// TODO: Avoid the locking here.
 	cc.mu.RLock()
 	defer cc.mu.RUnlock()
-	m, ok = cc.sc.Methods[method]
-	return
+	m, ok := cc.sc.Methods[method]
+	if !ok {
+		i := strings.LastIndex(method, "/")
+		m, _ = cc.sc.Methods[method[:i+1]]
+	}
+	return m
 }
 
 func (cc *ClientConn) getTransport(ctx context.Context, opts BalancerGetOptions) (transport.ClientTransport, func(), error) {

rpc_util.go

@@ -137,12 +137,14 @@ func (d *gzipDecompressor) Type() string {
 
 // callInfo contains all related configuration and information about an RPC.
 type callInfo struct {
-	failFast  bool
-	headerMD  metadata.MD
-	trailerMD metadata.MD
-	peer      *peer.Peer
-	traceInfo traceInfo // in trace.go
-	creds     credentials.PerRPCCredentials
+	failFast              bool
+	headerMD              metadata.MD
+	trailerMD             metadata.MD
+	peer                  *peer.Peer
+	traceInfo             traceInfo // in trace.go
+	maxReceiveMessageSize *int
+	maxSendMessageSize    *int
+	creds                 credentials.PerRPCCredentials
 }
 
 var defaultCallInfo = callInfo{failFast: true}
@@ -217,6 +219,22 @@ func FailFast(failFast bool) CallOption {
 	})
 }
 
+// MaxCallRecvMsgSize returns a CallOption which sets the maximum message size the client can receive.
+func MaxCallRecvMsgSize(s int) CallOption {
+	return beforeCall(func(o *callInfo) error {
+		o.maxReceiveMessageSize = &s
+		return nil
+	})
+}
+
+// MaxCallSendMsgSize returns a CallOption which sets the maximum message size the client can send.
+func MaxCallSendMsgSize(s int) CallOption {
+	return beforeCall(func(o *callInfo) error {
+		o.maxSendMessageSize = &s
+		return nil
+	})
+}
+
 // PerRPCCredentials returns a CallOption that sets credentials.PerRPCCredentials
 // for a call.
 func PerRPCCredentials(creds credentials.PerRPCCredentials) CallOption {
@@ -259,7 +277,7 @@ type parser struct {
 // No other error values or types must be returned, which also means
 // that the underlying io.Reader must not return an incompatible
 // error.
-func (p *parser) recvMsg(maxMsgSize int) (pf payloadFormat, msg []byte, err error) {
+func (p *parser) recvMsg(maxReceiveMessageSize int) (pf payloadFormat, msg []byte, err error) {
 	if _, err := io.ReadFull(p.r, p.header[:]); err != nil {
 		return 0, nil, err
 	}
@@ -270,8 +288,8 @@ func (p *parser) recvMsg(maxMsgSize int) (pf payloadFormat, msg []byte, err erro
 	if length == 0 {
 		return pf, nil, nil
 	}
-	if length > uint32(maxMsgSize) {
-		return 0, nil, Errorf(codes.Internal, "grpc: received message length %d exceeding the max size %d", length, maxMsgSize)
+	if length > uint32(maxReceiveMessageSize) {
+		return 0, nil, Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", length, maxReceiveMessageSize)
 	}
 	// TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
 	// of making it for each message:
@@ -314,7 +332,7 @@ func encode(c Codec, msg interface{}, cp Compressor, cbuf *bytes.Buffer, outPayl
 		length = uint(len(b))
 	}
 	if length > math.MaxUint32 {
-		return nil, Errorf(codes.InvalidArgument, "grpc: message too large (%d bytes)", length)
+		return nil, Errorf(codes.ResourceExhausted, "grpc: message too large (%d bytes)", length)
 	}
 
 	const (
@@ -355,8 +373,8 @@ func checkRecvPayload(pf payloadFormat, recvCompress string, dc Decompressor) er
 	return nil
 }
 
-func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}, maxMsgSize int, inPayload *stats.InPayload) error {
-	pf, d, err := p.recvMsg(maxMsgSize)
+func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}, maxReceiveMessageSize int, inPayload *stats.InPayload) error {
+	pf, d, err := p.recvMsg(maxReceiveMessageSize)
 	if err != nil {
 		return err
 	}
@@ -372,10 +390,10 @@ func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{
 			return Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
 		}
 	}
-	if len(d) > maxMsgSize {
+	if len(d) > maxReceiveMessageSize {
 		// TODO: Revisit the error code. Currently keep it consistent with java
 		// implementation.
-		return Errorf(codes.Internal, "grpc: received a message of %d bytes exceeding %d limit", len(d), maxMsgSize)
+		return Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", len(d), maxReceiveMessageSize)
 	}
 	if err := c.Unmarshal(d, m); err != nil {
 		return Errorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
@@ -501,24 +519,22 @@ type MethodConfig struct {
 	// WaitForReady indicates whether RPCs sent to this method should wait until
 	// the connection is ready by default (!failfast). The value specified via the
 	// gRPC client API will override the value set here.
-	WaitForReady bool
+	WaitForReady *bool
 	// Timeout is the default timeout for RPCs sent to this method. The actual
 	// deadline used will be the minimum of the value specified here and the value
 	// set by the application via the gRPC client API.  If either one is not set,
 	// then the other will be used.  If neither is set, then the RPC has no deadline.
-	Timeout time.Duration
+	Timeout *time.Duration
 	// MaxReqSize is the maximum allowed payload size for an individual request in a
 	// stream (client->server) in bytes. The size which is measured is the serialized
 	// payload after per-message compression (but before stream compression) in bytes.
 	// The actual value used is the minumum of the value specified here and the value set
 	// by the application via the gRPC client API. If either one is not set, then the other
 	// will be used.  If neither is set, then the built-in default is used.
-	// TODO: support this.
-	MaxReqSize uint32
+	MaxReqSize *int
 	// MaxRespSize is the maximum allowed payload size for an individual response in a
 	// stream (server->client) in bytes.
-	// TODO: support this.
-	MaxRespSize uint32
+	MaxRespSize *int
 }
 
 // ServiceConfig is provided by the service provider and contains parameters for how
@@ -529,9 +545,32 @@ type ServiceConfig struct {
 	// via grpc.WithBalancer will override this.
 	LB Balancer
 	// Methods contains a map for the methods in this service.
+	// If there is an exact match for a method (i.e. /service/method) in the map, use the corresponding MethodConfig.
+	// If there's no exact match, look for the default config for the service (/service/) and use the corresponding MethodConfig if it exists.
+	// Otherwise, the method has no MethodConfig to use.
 	Methods map[string]MethodConfig
 }
 
+func min(a, b *int) *int {
+	if *a < *b {
+		return a
+	}
+	return b
+}
+
+func getMaxSize(mcMax, doptMax *int, defaultVal int) *int {
+	if mcMax == nil && doptMax == nil {
+		return &defaultVal
+	}
+	if mcMax != nil && doptMax != nil {
+		return min(mcMax, doptMax)
+	}
+	if mcMax != nil {
+		return mcMax
+	}
+	return doptMax
+}
+
 // SupportPackageIsVersion4 is referenced from generated protocol buffer files
 // to assert that that code is compatible with this version of the grpc package.
 //