1311 lines
38 KiB
Go
1311 lines
38 KiB
Go
/*
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*
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* Copyright 2014 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package grpc
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"math"
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"net"
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"net/http"
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"reflect"
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"runtime"
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"strings"
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"sync"
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"time"
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"io/ioutil"
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"golang.org/x/net/context"
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"golang.org/x/net/http2"
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"golang.org/x/net/trace"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/encoding"
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/internal"
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"google.golang.org/grpc/keepalive"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/stats"
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"google.golang.org/grpc/status"
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"google.golang.org/grpc/tap"
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"google.golang.org/grpc/transport"
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)
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const (
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defaultServerMaxReceiveMessageSize = 1024 * 1024 * 4
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defaultServerMaxSendMessageSize = math.MaxInt32
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)
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type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
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// MethodDesc represents an RPC service's method specification.
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type MethodDesc struct {
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MethodName string
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Handler methodHandler
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}
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// ServiceDesc represents an RPC service's specification.
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type ServiceDesc struct {
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ServiceName string
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// The pointer to the service interface. Used to check whether the user
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// provided implementation satisfies the interface requirements.
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HandlerType interface{}
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Methods []MethodDesc
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Streams []StreamDesc
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Metadata interface{}
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}
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// service consists of the information of the server serving this service and
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// the methods in this service.
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type service struct {
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server interface{} // the server for service methods
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md map[string]*MethodDesc
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sd map[string]*StreamDesc
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mdata interface{}
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}
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// Server is a gRPC server to serve RPC requests.
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type Server struct {
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opts options
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mu sync.Mutex // guards following
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lis map[net.Listener]bool
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conns map[io.Closer]bool
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serve bool
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drain bool
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cv *sync.Cond // signaled when connections close for GracefulStop
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m map[string]*service // service name -> service info
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events trace.EventLog
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quit chan struct{}
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done chan struct{}
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quitOnce sync.Once
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doneOnce sync.Once
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serveWG sync.WaitGroup // counts active Serve goroutines for GracefulStop
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}
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type options struct {
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creds credentials.TransportCredentials
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codec Codec
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cp Compressor
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dc Decompressor
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unaryInt UnaryServerInterceptor
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streamInt StreamServerInterceptor
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inTapHandle tap.ServerInHandle
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statsHandler stats.Handler
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maxConcurrentStreams uint32
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maxReceiveMessageSize int
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maxSendMessageSize int
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useHandlerImpl bool // use http.Handler-based server
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unknownStreamDesc *StreamDesc
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keepaliveParams keepalive.ServerParameters
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keepalivePolicy keepalive.EnforcementPolicy
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initialWindowSize int32
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initialConnWindowSize int32
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writeBufferSize int
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readBufferSize int
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connectionTimeout time.Duration
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}
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var defaultServerOptions = options{
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maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
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maxSendMessageSize: defaultServerMaxSendMessageSize,
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connectionTimeout: 120 * time.Second,
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}
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// A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
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type ServerOption func(*options)
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// WriteBufferSize lets you set the size of write buffer, this determines how much data can be batched
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// before doing a write on the wire.
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func WriteBufferSize(s int) ServerOption {
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return func(o *options) {
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o.writeBufferSize = s
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}
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}
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// ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most
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// for one read syscall.
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func ReadBufferSize(s int) ServerOption {
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return func(o *options) {
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o.readBufferSize = s
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}
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}
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// InitialWindowSize returns a ServerOption that sets window size for stream.
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// The lower bound for window size is 64K and any value smaller than that will be ignored.
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func InitialWindowSize(s int32) ServerOption {
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return func(o *options) {
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o.initialWindowSize = s
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}
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}
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// InitialConnWindowSize returns a ServerOption that sets window size for a connection.
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// The lower bound for window size is 64K and any value smaller than that will be ignored.
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func InitialConnWindowSize(s int32) ServerOption {
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return func(o *options) {
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o.initialConnWindowSize = s
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}
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}
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// KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.
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func KeepaliveParams(kp keepalive.ServerParameters) ServerOption {
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return func(o *options) {
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o.keepaliveParams = kp
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}
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}
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// KeepaliveEnforcementPolicy returns a ServerOption that sets keepalive enforcement policy for the server.
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func KeepaliveEnforcementPolicy(kep keepalive.EnforcementPolicy) ServerOption {
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return func(o *options) {
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o.keepalivePolicy = kep
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}
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}
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// CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.
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func CustomCodec(codec Codec) ServerOption {
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return func(o *options) {
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o.codec = codec
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}
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}
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// RPCCompressor returns a ServerOption that sets a compressor for outbound
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// messages. For backward compatibility, all outbound messages will be sent
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// using this compressor, regardless of incoming message compression. By
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// default, server messages will be sent using the same compressor with which
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// request messages were sent.
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//
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// Deprecated: use encoding.RegisterCompressor instead.
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func RPCCompressor(cp Compressor) ServerOption {
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return func(o *options) {
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o.cp = cp
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}
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}
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// RPCDecompressor returns a ServerOption that sets a decompressor for inbound
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// messages. It has higher priority than decompressors registered via
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// encoding.RegisterCompressor.
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//
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// Deprecated: use encoding.RegisterCompressor instead.
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func RPCDecompressor(dc Decompressor) ServerOption {
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return func(o *options) {
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o.dc = dc
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}
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}
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// MaxMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
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// If this is not set, gRPC uses the default limit. Deprecated: use MaxRecvMsgSize instead.
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func MaxMsgSize(m int) ServerOption {
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return MaxRecvMsgSize(m)
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}
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// MaxRecvMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
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// If this is not set, gRPC uses the default 4MB.
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func MaxRecvMsgSize(m int) ServerOption {
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return func(o *options) {
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o.maxReceiveMessageSize = m
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}
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}
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// MaxSendMsgSize returns a ServerOption to set the max message size in bytes the server can send.
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// If this is not set, gRPC uses the default 4MB.
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func MaxSendMsgSize(m int) ServerOption {
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return func(o *options) {
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o.maxSendMessageSize = m
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}
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}
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// MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
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// of concurrent streams to each ServerTransport.
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func MaxConcurrentStreams(n uint32) ServerOption {
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return func(o *options) {
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o.maxConcurrentStreams = n
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}
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}
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// Creds returns a ServerOption that sets credentials for server connections.
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func Creds(c credentials.TransportCredentials) ServerOption {
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return func(o *options) {
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o.creds = c
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}
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}
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// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the
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// server. Only one unary interceptor can be installed. The construction of multiple
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// interceptors (e.g., chaining) can be implemented at the caller.
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func UnaryInterceptor(i UnaryServerInterceptor) ServerOption {
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return func(o *options) {
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if o.unaryInt != nil {
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panic("The unary server interceptor was already set and may not be reset.")
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}
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o.unaryInt = i
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}
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}
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// StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the
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// server. Only one stream interceptor can be installed.
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func StreamInterceptor(i StreamServerInterceptor) ServerOption {
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return func(o *options) {
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if o.streamInt != nil {
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panic("The stream server interceptor was already set and may not be reset.")
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}
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o.streamInt = i
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}
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}
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// InTapHandle returns a ServerOption that sets the tap handle for all the server
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// transport to be created. Only one can be installed.
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func InTapHandle(h tap.ServerInHandle) ServerOption {
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return func(o *options) {
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if o.inTapHandle != nil {
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panic("The tap handle was already set and may not be reset.")
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}
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o.inTapHandle = h
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}
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}
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// StatsHandler returns a ServerOption that sets the stats handler for the server.
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func StatsHandler(h stats.Handler) ServerOption {
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return func(o *options) {
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o.statsHandler = h
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}
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}
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// UnknownServiceHandler returns a ServerOption that allows for adding a custom
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// unknown service handler. The provided method is a bidi-streaming RPC service
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// handler that will be invoked instead of returning the "unimplemented" gRPC
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// error whenever a request is received for an unregistered service or method.
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// The handling function has full access to the Context of the request and the
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// stream, and the invocation bypasses interceptors.
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func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
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return func(o *options) {
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o.unknownStreamDesc = &StreamDesc{
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StreamName: "unknown_service_handler",
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Handler: streamHandler,
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// We need to assume that the users of the streamHandler will want to use both.
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ClientStreams: true,
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ServerStreams: true,
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}
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}
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}
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// ConnectionTimeout returns a ServerOption that sets the timeout for
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// connection establishment (up to and including HTTP/2 handshaking) for all
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// new connections. If this is not set, the default is 120 seconds. A zero or
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// negative value will result in an immediate timeout.
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//
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// This API is EXPERIMENTAL.
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func ConnectionTimeout(d time.Duration) ServerOption {
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return func(o *options) {
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o.connectionTimeout = d
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}
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}
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// NewServer creates a gRPC server which has no service registered and has not
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// started to accept requests yet.
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func NewServer(opt ...ServerOption) *Server {
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opts := defaultServerOptions
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for _, o := range opt {
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o(&opts)
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}
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if opts.codec == nil {
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// Set the default codec.
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opts.codec = protoCodec{}
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}
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s := &Server{
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lis: make(map[net.Listener]bool),
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opts: opts,
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conns: make(map[io.Closer]bool),
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m: make(map[string]*service),
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quit: make(chan struct{}),
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done: make(chan struct{}),
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}
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s.cv = sync.NewCond(&s.mu)
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if EnableTracing {
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_, file, line, _ := runtime.Caller(1)
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s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
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}
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return s
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}
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// printf records an event in s's event log, unless s has been stopped.
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// REQUIRES s.mu is held.
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func (s *Server) printf(format string, a ...interface{}) {
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if s.events != nil {
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s.events.Printf(format, a...)
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}
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}
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// errorf records an error in s's event log, unless s has been stopped.
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// REQUIRES s.mu is held.
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func (s *Server) errorf(format string, a ...interface{}) {
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if s.events != nil {
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s.events.Errorf(format, a...)
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}
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}
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// RegisterService registers a service and its implementation to the gRPC
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// server. It is called from the IDL generated code. This must be called before
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// invoking Serve.
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func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
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ht := reflect.TypeOf(sd.HandlerType).Elem()
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st := reflect.TypeOf(ss)
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if !st.Implements(ht) {
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grpclog.Fatalf("grpc: Server.RegisterService found the handler of type %v that does not satisfy %v", st, ht)
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}
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s.register(sd, ss)
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}
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func (s *Server) register(sd *ServiceDesc, ss interface{}) {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.printf("RegisterService(%q)", sd.ServiceName)
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if s.serve {
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grpclog.Fatalf("grpc: Server.RegisterService after Server.Serve for %q", sd.ServiceName)
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}
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if _, ok := s.m[sd.ServiceName]; ok {
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grpclog.Fatalf("grpc: Server.RegisterService found duplicate service registration for %q", sd.ServiceName)
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}
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srv := &service{
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server: ss,
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md: make(map[string]*MethodDesc),
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sd: make(map[string]*StreamDesc),
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mdata: sd.Metadata,
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}
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for i := range sd.Methods {
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d := &sd.Methods[i]
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srv.md[d.MethodName] = d
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}
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for i := range sd.Streams {
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d := &sd.Streams[i]
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srv.sd[d.StreamName] = d
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}
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s.m[sd.ServiceName] = srv
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}
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// MethodInfo contains the information of an RPC including its method name and type.
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type MethodInfo struct {
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// Name is the method name only, without the service name or package name.
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Name string
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// IsClientStream indicates whether the RPC is a client streaming RPC.
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IsClientStream bool
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// IsServerStream indicates whether the RPC is a server streaming RPC.
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IsServerStream bool
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}
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// ServiceInfo contains unary RPC method info, streaming RPC method info and metadata for a service.
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type ServiceInfo struct {
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Methods []MethodInfo
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// Metadata is the metadata specified in ServiceDesc when registering service.
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Metadata interface{}
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}
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// GetServiceInfo returns a map from service names to ServiceInfo.
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// Service names include the package names, in the form of <package>.<service>.
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func (s *Server) GetServiceInfo() map[string]ServiceInfo {
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ret := make(map[string]ServiceInfo)
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for n, srv := range s.m {
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methods := make([]MethodInfo, 0, len(srv.md)+len(srv.sd))
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for m := range srv.md {
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methods = append(methods, MethodInfo{
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Name: m,
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IsClientStream: false,
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IsServerStream: false,
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})
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}
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for m, d := range srv.sd {
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methods = append(methods, MethodInfo{
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Name: m,
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IsClientStream: d.ClientStreams,
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IsServerStream: d.ServerStreams,
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})
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}
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ret[n] = ServiceInfo{
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Methods: methods,
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Metadata: srv.mdata,
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}
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}
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return ret
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}
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|
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// ErrServerStopped indicates that the operation is now illegal because of
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// the server being stopped.
|
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var ErrServerStopped = errors.New("grpc: the server has been stopped")
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|
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func (s *Server) useTransportAuthenticator(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
|
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if s.opts.creds == nil {
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return rawConn, nil, nil
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}
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return s.opts.creds.ServerHandshake(rawConn)
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}
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// Serve accepts incoming connections on the listener lis, creating a new
|
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// ServerTransport and service goroutine for each. The service goroutines
|
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// read gRPC requests and then call the registered handlers to reply to them.
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// Serve returns when lis.Accept fails with fatal errors. lis will be closed when
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// this method returns.
|
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// Serve will return a non-nil error unless Stop or GracefulStop is called.
|
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func (s *Server) Serve(lis net.Listener) error {
|
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s.mu.Lock()
|
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s.printf("serving")
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s.serve = true
|
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if s.lis == nil {
|
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// Serve called after Stop or GracefulStop.
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s.mu.Unlock()
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lis.Close()
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return ErrServerStopped
|
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}
|
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|
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s.serveWG.Add(1)
|
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defer func() {
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s.serveWG.Done()
|
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select {
|
|
// Stop or GracefulStop called; block until done and return nil.
|
|
case <-s.quit:
|
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<-s.done
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default:
|
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}
|
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}()
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|
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s.lis[lis] = true
|
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s.mu.Unlock()
|
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defer func() {
|
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s.mu.Lock()
|
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if s.lis != nil && s.lis[lis] {
|
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lis.Close()
|
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delete(s.lis, lis)
|
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}
|
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s.mu.Unlock()
|
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}()
|
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|
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var tempDelay time.Duration // how long to sleep on accept failure
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|
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for {
|
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rawConn, err := lis.Accept()
|
|
if err != nil {
|
|
if ne, ok := err.(interface {
|
|
Temporary() bool
|
|
}); ok && ne.Temporary() {
|
|
if tempDelay == 0 {
|
|
tempDelay = 5 * time.Millisecond
|
|
} else {
|
|
tempDelay *= 2
|
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}
|
|
if max := 1 * time.Second; tempDelay > max {
|
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tempDelay = max
|
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}
|
|
s.mu.Lock()
|
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s.printf("Accept error: %v; retrying in %v", err, tempDelay)
|
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s.mu.Unlock()
|
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timer := time.NewTimer(tempDelay)
|
|
select {
|
|
case <-timer.C:
|
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case <-s.quit:
|
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timer.Stop()
|
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return nil
|
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}
|
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continue
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}
|
|
s.mu.Lock()
|
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s.printf("done serving; Accept = %v", err)
|
|
s.mu.Unlock()
|
|
|
|
select {
|
|
case <-s.quit:
|
|
return nil
|
|
default:
|
|
}
|
|
return err
|
|
}
|
|
tempDelay = 0
|
|
// Start a new goroutine to deal with rawConn so we don't stall this Accept
|
|
// loop goroutine.
|
|
//
|
|
// Make sure we account for the goroutine so GracefulStop doesn't nil out
|
|
// s.conns before this conn can be added.
|
|
s.serveWG.Add(1)
|
|
go func() {
|
|
s.handleRawConn(rawConn)
|
|
s.serveWG.Done()
|
|
}()
|
|
}
|
|
}
|
|
|
|
// handleRawConn forks a goroutine to handle a just-accepted connection that
|
|
// has not had any I/O performed on it yet.
|
|
func (s *Server) handleRawConn(rawConn net.Conn) {
|
|
rawConn.SetDeadline(time.Now().Add(s.opts.connectionTimeout))
|
|
conn, authInfo, err := s.useTransportAuthenticator(rawConn)
|
|
if err != nil {
|
|
s.mu.Lock()
|
|
s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
|
|
s.mu.Unlock()
|
|
grpclog.Warningf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
|
|
// If serverHandshake returns ErrConnDispatched, keep rawConn open.
|
|
if err != credentials.ErrConnDispatched {
|
|
rawConn.Close()
|
|
}
|
|
rawConn.SetDeadline(time.Time{})
|
|
return
|
|
}
|
|
|
|
s.mu.Lock()
|
|
if s.conns == nil {
|
|
s.mu.Unlock()
|
|
conn.Close()
|
|
return
|
|
}
|
|
s.mu.Unlock()
|
|
|
|
var serve func()
|
|
c := conn.(io.Closer)
|
|
if s.opts.useHandlerImpl {
|
|
serve = func() { s.serveUsingHandler(conn) }
|
|
} else {
|
|
// Finish handshaking (HTTP2)
|
|
st := s.newHTTP2Transport(conn, authInfo)
|
|
if st == nil {
|
|
return
|
|
}
|
|
c = st
|
|
serve = func() { s.serveStreams(st) }
|
|
}
|
|
|
|
rawConn.SetDeadline(time.Time{})
|
|
if !s.addConn(c) {
|
|
return
|
|
}
|
|
go func() {
|
|
serve()
|
|
s.removeConn(c)
|
|
}()
|
|
}
|
|
|
|
// newHTTP2Transport sets up a http/2 transport (using the
|
|
// gRPC http2 server transport in transport/http2_server.go).
|
|
func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) transport.ServerTransport {
|
|
config := &transport.ServerConfig{
|
|
MaxStreams: s.opts.maxConcurrentStreams,
|
|
AuthInfo: authInfo,
|
|
InTapHandle: s.opts.inTapHandle,
|
|
StatsHandler: s.opts.statsHandler,
|
|
KeepaliveParams: s.opts.keepaliveParams,
|
|
KeepalivePolicy: s.opts.keepalivePolicy,
|
|
InitialWindowSize: s.opts.initialWindowSize,
|
|
InitialConnWindowSize: s.opts.initialConnWindowSize,
|
|
WriteBufferSize: s.opts.writeBufferSize,
|
|
ReadBufferSize: s.opts.readBufferSize,
|
|
}
|
|
st, err := transport.NewServerTransport("http2", c, config)
|
|
if err != nil {
|
|
s.mu.Lock()
|
|
s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
|
|
s.mu.Unlock()
|
|
c.Close()
|
|
grpclog.Warningln("grpc: Server.Serve failed to create ServerTransport: ", err)
|
|
return nil
|
|
}
|
|
return st
|
|
}
|
|
|
|
func (s *Server) serveStreams(st transport.ServerTransport) {
|
|
defer st.Close()
|
|
var wg sync.WaitGroup
|
|
st.HandleStreams(func(stream *transport.Stream) {
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
s.handleStream(st, stream, s.traceInfo(st, stream))
|
|
}()
|
|
}, func(ctx context.Context, method string) context.Context {
|
|
if !EnableTracing {
|
|
return ctx
|
|
}
|
|
tr := trace.New("grpc.Recv."+methodFamily(method), method)
|
|
return trace.NewContext(ctx, tr)
|
|
})
|
|
wg.Wait()
|
|
}
|
|
|
|
var _ http.Handler = (*Server)(nil)
|
|
|
|
// serveUsingHandler is called from handleRawConn when s is configured
|
|
// to handle requests via the http.Handler interface. It sets up a
|
|
// net/http.Server to handle the just-accepted conn. The http.Server
|
|
// is configured to route all incoming requests (all HTTP/2 streams)
|
|
// to ServeHTTP, which creates a new ServerTransport for each stream.
|
|
// serveUsingHandler blocks until conn closes.
|
|
//
|
|
// This codepath is only used when Server.TestingUseHandlerImpl has
|
|
// been configured. This lets the end2end tests exercise the ServeHTTP
|
|
// method as one of the environment types.
|
|
//
|
|
// conn is the *tls.Conn that's already been authenticated.
|
|
func (s *Server) serveUsingHandler(conn net.Conn) {
|
|
h2s := &http2.Server{
|
|
MaxConcurrentStreams: s.opts.maxConcurrentStreams,
|
|
}
|
|
h2s.ServeConn(conn, &http2.ServeConnOpts{
|
|
Handler: s,
|
|
})
|
|
}
|
|
|
|
// ServeHTTP implements the Go standard library's http.Handler
|
|
// interface by responding to the gRPC request r, by looking up
|
|
// the requested gRPC method in the gRPC server s.
|
|
//
|
|
// The provided HTTP request must have arrived on an HTTP/2
|
|
// connection. When using the Go standard library's server,
|
|
// practically this means that the Request must also have arrived
|
|
// over TLS.
|
|
//
|
|
// To share one port (such as 443 for https) between gRPC and an
|
|
// existing http.Handler, use a root http.Handler such as:
|
|
//
|
|
// if r.ProtoMajor == 2 && strings.HasPrefix(
|
|
// r.Header.Get("Content-Type"), "application/grpc") {
|
|
// grpcServer.ServeHTTP(w, r)
|
|
// } else {
|
|
// yourMux.ServeHTTP(w, r)
|
|
// }
|
|
//
|
|
// Note that ServeHTTP uses Go's HTTP/2 server implementation which is totally
|
|
// separate from grpc-go's HTTP/2 server. Performance and features may vary
|
|
// between the two paths. ServeHTTP does not support some gRPC features
|
|
// available through grpc-go's HTTP/2 server, and it is currently EXPERIMENTAL
|
|
// and subject to change.
|
|
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
st, err := transport.NewServerHandlerTransport(w, r)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
if !s.addConn(st) {
|
|
return
|
|
}
|
|
defer s.removeConn(st)
|
|
s.serveStreams(st)
|
|
}
|
|
|
|
// traceInfo returns a traceInfo and associates it with stream, if tracing is enabled.
|
|
// If tracing is not enabled, it returns nil.
|
|
func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Stream) (trInfo *traceInfo) {
|
|
tr, ok := trace.FromContext(stream.Context())
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
trInfo = &traceInfo{
|
|
tr: tr,
|
|
}
|
|
trInfo.firstLine.client = false
|
|
trInfo.firstLine.remoteAddr = st.RemoteAddr()
|
|
|
|
if dl, ok := stream.Context().Deadline(); ok {
|
|
trInfo.firstLine.deadline = dl.Sub(time.Now())
|
|
}
|
|
return trInfo
|
|
}
|
|
|
|
func (s *Server) addConn(c io.Closer) bool {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
if s.conns == nil {
|
|
c.Close()
|
|
return false
|
|
}
|
|
if s.drain {
|
|
// Transport added after we drained our existing conns: drain it
|
|
// immediately.
|
|
c.(transport.ServerTransport).Drain()
|
|
}
|
|
s.conns[c] = true
|
|
return true
|
|
}
|
|
|
|
func (s *Server) removeConn(c io.Closer) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
if s.conns != nil {
|
|
delete(s.conns, c)
|
|
s.cv.Broadcast()
|
|
}
|
|
}
|
|
|
|
func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options, comp encoding.Compressor) error {
|
|
var (
|
|
outPayload *stats.OutPayload
|
|
)
|
|
if s.opts.statsHandler != nil {
|
|
outPayload = &stats.OutPayload{}
|
|
}
|
|
hdr, data, err := encode(s.opts.codec, msg, cp, outPayload, comp)
|
|
if err != nil {
|
|
grpclog.Errorln("grpc: server failed to encode response: ", err)
|
|
return err
|
|
}
|
|
if len(data) > s.opts.maxSendMessageSize {
|
|
return status.Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(data), s.opts.maxSendMessageSize)
|
|
}
|
|
err = t.Write(stream, hdr, data, opts)
|
|
if err == nil && outPayload != nil {
|
|
outPayload.SentTime = time.Now()
|
|
s.opts.statsHandler.HandleRPC(stream.Context(), outPayload)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, trInfo *traceInfo) (err error) {
|
|
sh := s.opts.statsHandler
|
|
if sh != nil {
|
|
begin := &stats.Begin{
|
|
BeginTime: time.Now(),
|
|
}
|
|
sh.HandleRPC(stream.Context(), begin)
|
|
defer func() {
|
|
end := &stats.End{
|
|
EndTime: time.Now(),
|
|
}
|
|
if err != nil && err != io.EOF {
|
|
end.Error = toRPCErr(err)
|
|
}
|
|
sh.HandleRPC(stream.Context(), end)
|
|
}()
|
|
}
|
|
if trInfo != nil {
|
|
defer trInfo.tr.Finish()
|
|
trInfo.firstLine.client = false
|
|
trInfo.tr.LazyLog(&trInfo.firstLine, false)
|
|
defer func() {
|
|
if err != nil && err != io.EOF {
|
|
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
}()
|
|
}
|
|
|
|
// comp and cp are used for compression. decomp and dc are used for
|
|
// decompression. If comp and decomp are both set, they are the same;
|
|
// however they are kept separate to ensure that at most one of the
|
|
// compressor/decompressor variable pairs are set for use later.
|
|
var comp, decomp encoding.Compressor
|
|
var cp Compressor
|
|
var dc Decompressor
|
|
|
|
// If dc is set and matches the stream's compression, use it. Otherwise, try
|
|
// to find a matching registered compressor for decomp.
|
|
if rc := stream.RecvCompress(); s.opts.dc != nil && s.opts.dc.Type() == rc {
|
|
dc = s.opts.dc
|
|
} else if rc != "" && rc != encoding.Identity {
|
|
decomp = encoding.GetCompressor(rc)
|
|
if decomp == nil {
|
|
st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
|
|
t.WriteStatus(stream, st)
|
|
return st.Err()
|
|
}
|
|
}
|
|
|
|
// If cp is set, use it. Otherwise, attempt to compress the response using
|
|
// the incoming message compression method.
|
|
//
|
|
// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
|
|
if s.opts.cp != nil {
|
|
cp = s.opts.cp
|
|
stream.SetSendCompress(cp.Type())
|
|
} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
|
|
// Legacy compressor not specified; attempt to respond with same encoding.
|
|
comp = encoding.GetCompressor(rc)
|
|
if comp != nil {
|
|
stream.SetSendCompress(rc)
|
|
}
|
|
}
|
|
|
|
p := &parser{r: stream}
|
|
pf, req, err := p.recvMsg(s.opts.maxReceiveMessageSize)
|
|
if err == io.EOF {
|
|
// The entire stream is done (for unary RPC only).
|
|
return err
|
|
}
|
|
if err == io.ErrUnexpectedEOF {
|
|
err = status.Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
|
|
}
|
|
if err != nil {
|
|
if st, ok := status.FromError(err); ok {
|
|
if e := t.WriteStatus(stream, st); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
|
|
}
|
|
} else {
|
|
switch st := err.(type) {
|
|
case transport.ConnectionError:
|
|
// Nothing to do here.
|
|
case transport.StreamError:
|
|
if e := t.WriteStatus(stream, status.New(st.Code, st.Desc)); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("grpc: Unexpected error (%T) from recvMsg: %v", st, st))
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
if st := checkRecvPayload(pf, stream.RecvCompress(), dc != nil || decomp != nil); st != nil {
|
|
if e := t.WriteStatus(stream, st); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
|
|
}
|
|
return st.Err()
|
|
}
|
|
var inPayload *stats.InPayload
|
|
if sh != nil {
|
|
inPayload = &stats.InPayload{
|
|
RecvTime: time.Now(),
|
|
}
|
|
}
|
|
df := func(v interface{}) error {
|
|
if inPayload != nil {
|
|
inPayload.WireLength = len(req)
|
|
}
|
|
if pf == compressionMade {
|
|
var err error
|
|
if dc != nil {
|
|
req, err = dc.Do(bytes.NewReader(req))
|
|
if err != nil {
|
|
return status.Errorf(codes.Internal, err.Error())
|
|
}
|
|
} else {
|
|
tmp, _ := decomp.Decompress(bytes.NewReader(req))
|
|
req, err = ioutil.ReadAll(tmp)
|
|
if err != nil {
|
|
return status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
|
|
}
|
|
}
|
|
}
|
|
if len(req) > s.opts.maxReceiveMessageSize {
|
|
// TODO: Revisit the error code. Currently keep it consistent with
|
|
// java implementation.
|
|
return status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", len(req), s.opts.maxReceiveMessageSize)
|
|
}
|
|
if err := s.opts.codec.Unmarshal(req, v); err != nil {
|
|
return status.Errorf(codes.Internal, "grpc: error unmarshalling request: %v", err)
|
|
}
|
|
if inPayload != nil {
|
|
inPayload.Payload = v
|
|
inPayload.Data = req
|
|
inPayload.Length = len(req)
|
|
sh.HandleRPC(stream.Context(), inPayload)
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
|
|
}
|
|
return nil
|
|
}
|
|
reply, appErr := md.Handler(srv.server, stream.Context(), df, s.opts.unaryInt)
|
|
if appErr != nil {
|
|
appStatus, ok := status.FromError(appErr)
|
|
if !ok {
|
|
// Convert appErr if it is not a grpc status error.
|
|
appErr = status.Error(convertCode(appErr), appErr.Error())
|
|
appStatus, _ = status.FromError(appErr)
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
if e := t.WriteStatus(stream, appStatus); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
|
|
}
|
|
return appErr
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(stringer("OK"), false)
|
|
}
|
|
opts := &transport.Options{
|
|
Last: true,
|
|
Delay: false,
|
|
}
|
|
|
|
if err := s.sendResponse(t, stream, reply, cp, opts, comp); err != nil {
|
|
if err == io.EOF {
|
|
// The entire stream is done (for unary RPC only).
|
|
return err
|
|
}
|
|
if s, ok := status.FromError(err); ok {
|
|
if e := t.WriteStatus(stream, s); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
|
|
}
|
|
} else {
|
|
switch st := err.(type) {
|
|
case transport.ConnectionError:
|
|
// Nothing to do here.
|
|
case transport.StreamError:
|
|
if e := t.WriteStatus(stream, status.New(st.Code, st.Desc)); e != nil {
|
|
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("grpc: Unexpected error (%T) from sendResponse: %v", st, st))
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
|
|
}
|
|
// TODO: Should we be logging if writing status failed here, like above?
|
|
// Should the logging be in WriteStatus? Should we ignore the WriteStatus
|
|
// error or allow the stats handler to see it?
|
|
return t.WriteStatus(stream, status.New(codes.OK, ""))
|
|
}
|
|
|
|
func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
|
|
sh := s.opts.statsHandler
|
|
if sh != nil {
|
|
begin := &stats.Begin{
|
|
BeginTime: time.Now(),
|
|
}
|
|
sh.HandleRPC(stream.Context(), begin)
|
|
defer func() {
|
|
end := &stats.End{
|
|
EndTime: time.Now(),
|
|
}
|
|
if err != nil && err != io.EOF {
|
|
end.Error = toRPCErr(err)
|
|
}
|
|
sh.HandleRPC(stream.Context(), end)
|
|
}()
|
|
}
|
|
ss := &serverStream{
|
|
t: t,
|
|
s: stream,
|
|
p: &parser{r: stream},
|
|
codec: s.opts.codec,
|
|
maxReceiveMessageSize: s.opts.maxReceiveMessageSize,
|
|
maxSendMessageSize: s.opts.maxSendMessageSize,
|
|
trInfo: trInfo,
|
|
statsHandler: sh,
|
|
}
|
|
|
|
// If dc is set and matches the stream's compression, use it. Otherwise, try
|
|
// to find a matching registered compressor for decomp.
|
|
if rc := stream.RecvCompress(); s.opts.dc != nil && s.opts.dc.Type() == rc {
|
|
ss.dc = s.opts.dc
|
|
} else if rc != "" && rc != encoding.Identity {
|
|
ss.decomp = encoding.GetCompressor(rc)
|
|
if ss.decomp == nil {
|
|
st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
|
|
t.WriteStatus(ss.s, st)
|
|
return st.Err()
|
|
}
|
|
}
|
|
|
|
// If cp is set, use it. Otherwise, attempt to compress the response using
|
|
// the incoming message compression method.
|
|
//
|
|
// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
|
|
if s.opts.cp != nil {
|
|
ss.cp = s.opts.cp
|
|
stream.SetSendCompress(s.opts.cp.Type())
|
|
} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
|
|
// Legacy compressor not specified; attempt to respond with same encoding.
|
|
ss.comp = encoding.GetCompressor(rc)
|
|
if ss.comp != nil {
|
|
stream.SetSendCompress(rc)
|
|
}
|
|
}
|
|
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&trInfo.firstLine, false)
|
|
defer func() {
|
|
ss.mu.Lock()
|
|
if err != nil && err != io.EOF {
|
|
ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
|
|
ss.trInfo.tr.SetError()
|
|
}
|
|
ss.trInfo.tr.Finish()
|
|
ss.trInfo.tr = nil
|
|
ss.mu.Unlock()
|
|
}()
|
|
}
|
|
var appErr error
|
|
var server interface{}
|
|
if srv != nil {
|
|
server = srv.server
|
|
}
|
|
if s.opts.streamInt == nil {
|
|
appErr = sd.Handler(server, ss)
|
|
} else {
|
|
info := &StreamServerInfo{
|
|
FullMethod: stream.Method(),
|
|
IsClientStream: sd.ClientStreams,
|
|
IsServerStream: sd.ServerStreams,
|
|
}
|
|
appErr = s.opts.streamInt(server, ss, info, sd.Handler)
|
|
}
|
|
if appErr != nil {
|
|
appStatus, ok := status.FromError(appErr)
|
|
if !ok {
|
|
switch err := appErr.(type) {
|
|
case transport.StreamError:
|
|
appStatus = status.New(err.Code, err.Desc)
|
|
default:
|
|
appStatus = status.New(convertCode(appErr), appErr.Error())
|
|
}
|
|
appErr = appStatus.Err()
|
|
}
|
|
if trInfo != nil {
|
|
ss.mu.Lock()
|
|
ss.trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
|
|
ss.trInfo.tr.SetError()
|
|
ss.mu.Unlock()
|
|
}
|
|
t.WriteStatus(ss.s, appStatus)
|
|
// TODO: Should we log an error from WriteStatus here and below?
|
|
return appErr
|
|
}
|
|
if trInfo != nil {
|
|
ss.mu.Lock()
|
|
ss.trInfo.tr.LazyLog(stringer("OK"), false)
|
|
ss.mu.Unlock()
|
|
}
|
|
return t.WriteStatus(ss.s, status.New(codes.OK, ""))
|
|
|
|
}
|
|
|
|
func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream, trInfo *traceInfo) {
|
|
sm := stream.Method()
|
|
if sm != "" && sm[0] == '/' {
|
|
sm = sm[1:]
|
|
}
|
|
pos := strings.LastIndex(sm, "/")
|
|
if pos == -1 {
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"Malformed method name %q", []interface{}{sm}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
errDesc := fmt.Sprintf("malformed method name: %q", stream.Method())
|
|
if err := t.WriteStatus(stream, status.New(codes.ResourceExhausted, errDesc)); err != nil {
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.Finish()
|
|
}
|
|
return
|
|
}
|
|
service := sm[:pos]
|
|
method := sm[pos+1:]
|
|
srv, ok := s.m[service]
|
|
if !ok {
|
|
if unknownDesc := s.opts.unknownStreamDesc; unknownDesc != nil {
|
|
s.processStreamingRPC(t, stream, nil, unknownDesc, trInfo)
|
|
return
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"Unknown service %v", []interface{}{service}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
errDesc := fmt.Sprintf("unknown service %v", service)
|
|
if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.Finish()
|
|
}
|
|
return
|
|
}
|
|
// Unary RPC or Streaming RPC?
|
|
if md, ok := srv.md[method]; ok {
|
|
s.processUnaryRPC(t, stream, srv, md, trInfo)
|
|
return
|
|
}
|
|
if sd, ok := srv.sd[method]; ok {
|
|
s.processStreamingRPC(t, stream, srv, sd, trInfo)
|
|
return
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"Unknown method %v", []interface{}{method}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
if unknownDesc := s.opts.unknownStreamDesc; unknownDesc != nil {
|
|
s.processStreamingRPC(t, stream, nil, unknownDesc, trInfo)
|
|
return
|
|
}
|
|
errDesc := fmt.Sprintf("unknown method %v", method)
|
|
if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
|
|
if trInfo != nil {
|
|
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
|
|
trInfo.tr.SetError()
|
|
}
|
|
grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
|
|
}
|
|
if trInfo != nil {
|
|
trInfo.tr.Finish()
|
|
}
|
|
}
|
|
|
|
// Stop stops the gRPC server. It immediately closes all open
|
|
// connections and listeners.
|
|
// It cancels all active RPCs on the server side and the corresponding
|
|
// pending RPCs on the client side will get notified by connection
|
|
// errors.
|
|
func (s *Server) Stop() {
|
|
s.quitOnce.Do(func() {
|
|
close(s.quit)
|
|
})
|
|
|
|
defer func() {
|
|
s.serveWG.Wait()
|
|
s.doneOnce.Do(func() {
|
|
close(s.done)
|
|
})
|
|
}()
|
|
|
|
s.mu.Lock()
|
|
listeners := s.lis
|
|
s.lis = nil
|
|
st := s.conns
|
|
s.conns = nil
|
|
// interrupt GracefulStop if Stop and GracefulStop are called concurrently.
|
|
s.cv.Broadcast()
|
|
s.mu.Unlock()
|
|
|
|
for lis := range listeners {
|
|
lis.Close()
|
|
}
|
|
for c := range st {
|
|
c.Close()
|
|
}
|
|
|
|
s.mu.Lock()
|
|
if s.events != nil {
|
|
s.events.Finish()
|
|
s.events = nil
|
|
}
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
// GracefulStop stops the gRPC server gracefully. It stops the server from
|
|
// accepting new connections and RPCs and blocks until all the pending RPCs are
|
|
// finished.
|
|
func (s *Server) GracefulStop() {
|
|
s.quitOnce.Do(func() {
|
|
close(s.quit)
|
|
})
|
|
|
|
defer func() {
|
|
s.doneOnce.Do(func() {
|
|
close(s.done)
|
|
})
|
|
}()
|
|
|
|
s.mu.Lock()
|
|
if s.conns == nil {
|
|
s.mu.Unlock()
|
|
return
|
|
}
|
|
for lis := range s.lis {
|
|
lis.Close()
|
|
}
|
|
s.lis = nil
|
|
if !s.drain {
|
|
for c := range s.conns {
|
|
c.(transport.ServerTransport).Drain()
|
|
}
|
|
s.drain = true
|
|
}
|
|
|
|
// Wait for serving threads to be ready to exit. Only then can we be sure no
|
|
// new conns will be created.
|
|
s.mu.Unlock()
|
|
s.serveWG.Wait()
|
|
s.mu.Lock()
|
|
|
|
for len(s.conns) != 0 {
|
|
s.cv.Wait()
|
|
}
|
|
s.conns = nil
|
|
if s.events != nil {
|
|
s.events.Finish()
|
|
s.events = nil
|
|
}
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
func init() {
|
|
internal.TestingUseHandlerImpl = func(arg interface{}) {
|
|
arg.(*Server).opts.useHandlerImpl = true
|
|
}
|
|
}
|
|
|
|
// SetHeader sets the header metadata.
|
|
// When called multiple times, all the provided metadata will be merged.
|
|
// All the metadata will be sent out when one of the following happens:
|
|
// - grpc.SendHeader() is called;
|
|
// - The first response is sent out;
|
|
// - An RPC status is sent out (error or success).
|
|
func SetHeader(ctx context.Context, md metadata.MD) error {
|
|
if md.Len() == 0 {
|
|
return nil
|
|
}
|
|
stream, ok := transport.StreamFromContext(ctx)
|
|
if !ok {
|
|
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
|
|
}
|
|
return stream.SetHeader(md)
|
|
}
|
|
|
|
// SendHeader sends header metadata. It may be called at most once.
|
|
// The provided md and headers set by SetHeader() will be sent.
|
|
func SendHeader(ctx context.Context, md metadata.MD) error {
|
|
stream, ok := transport.StreamFromContext(ctx)
|
|
if !ok {
|
|
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
|
|
}
|
|
t := stream.ServerTransport()
|
|
if t == nil {
|
|
grpclog.Fatalf("grpc: SendHeader: %v has no ServerTransport to send header metadata.", stream)
|
|
}
|
|
if err := t.WriteHeader(stream, md); err != nil {
|
|
return toRPCErr(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SetTrailer sets the trailer metadata that will be sent when an RPC returns.
|
|
// When called more than once, all the provided metadata will be merged.
|
|
func SetTrailer(ctx context.Context, md metadata.MD) error {
|
|
if md.Len() == 0 {
|
|
return nil
|
|
}
|
|
stream, ok := transport.StreamFromContext(ctx)
|
|
if !ok {
|
|
return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
|
|
}
|
|
return stream.SetTrailer(md)
|
|
}
|