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1298 lines
37 KiB
1298 lines
37 KiB
/*
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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 transport
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import (
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"io"
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"math"
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"net"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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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/http2/hpack"
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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/internal/channelz"
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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/peer"
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"google.golang.org/grpc/stats"
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"google.golang.org/grpc/status"
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)
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// http2Client implements the ClientTransport interface with HTTP2.
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type http2Client struct {
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ctx context.Context
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cancel context.CancelFunc
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ctxDone <-chan struct{} // Cache the ctx.Done() chan.
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userAgent string
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md interface{}
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conn net.Conn // underlying communication channel
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loopy *loopyWriter
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remoteAddr net.Addr
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localAddr net.Addr
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authInfo credentials.AuthInfo // auth info about the connection
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readerDone chan struct{} // sync point to enable testing.
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writerDone chan struct{} // sync point to enable testing.
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// goAway is closed to notify the upper layer (i.e., addrConn.transportMonitor)
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// that the server sent GoAway on this transport.
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goAway chan struct{}
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// awakenKeepalive is used to wake up keepalive when after it has gone dormant.
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awakenKeepalive chan struct{}
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framer *framer
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// controlBuf delivers all the control related tasks (e.g., window
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// updates, reset streams, and various settings) to the controller.
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controlBuf *controlBuffer
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fc *trInFlow
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// The scheme used: https if TLS is on, http otherwise.
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scheme string
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isSecure bool
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creds []credentials.PerRPCCredentials
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// Boolean to keep track of reading activity on transport.
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// 1 is true and 0 is false.
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activity uint32 // Accessed atomically.
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kp keepalive.ClientParameters
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keepaliveEnabled bool
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statsHandler stats.Handler
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initialWindowSize int32
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bdpEst *bdpEstimator
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// onSuccess is a callback that client transport calls upon
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// receiving server preface to signal that a succefull HTTP2
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// connection was established.
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onSuccess func()
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maxConcurrentStreams uint32
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streamQuota int64
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streamsQuotaAvailable chan struct{}
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waitingStreams uint32
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nextID uint32
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mu sync.Mutex // guard the following variables
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state transportState
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activeStreams map[uint32]*Stream
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// prevGoAway ID records the Last-Stream-ID in the previous GOAway frame.
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prevGoAwayID uint32
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// goAwayReason records the http2.ErrCode and debug data received with the
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// GoAway frame.
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goAwayReason GoAwayReason
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// Fields below are for channelz metric collection.
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channelzID int64 // channelz unique identification number
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czmu sync.RWMutex
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kpCount int64
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// The number of streams that have started, including already finished ones.
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streamsStarted int64
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// The number of streams that have ended successfully by receiving EoS bit set
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// frame from server.
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streamsSucceeded int64
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streamsFailed int64
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lastStreamCreated time.Time
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msgSent int64
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msgRecv int64
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lastMsgSent time.Time
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lastMsgRecv time.Time
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}
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func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr string) (net.Conn, error) {
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if fn != nil {
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return fn(ctx, addr)
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}
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return dialContext(ctx, "tcp", addr)
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}
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func isTemporary(err error) bool {
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switch err := err.(type) {
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case interface {
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Temporary() bool
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}:
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return err.Temporary()
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case interface {
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Timeout() bool
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}:
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// Timeouts may be resolved upon retry, and are thus treated as
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// temporary.
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return err.Timeout()
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}
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return true
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}
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// newHTTP2Client constructs a connected ClientTransport to addr based on HTTP2
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// and starts to receive messages on it. Non-nil error returns if construction
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// fails.
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func newHTTP2Client(connectCtx, ctx context.Context, addr TargetInfo, opts ConnectOptions, onSuccess func()) (_ ClientTransport, err error) {
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scheme := "http"
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ctx, cancel := context.WithCancel(ctx)
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defer func() {
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if err != nil {
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cancel()
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}
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}()
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conn, err := dial(connectCtx, opts.Dialer, addr.Addr)
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if err != nil {
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if opts.FailOnNonTempDialError {
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return nil, connectionErrorf(isTemporary(err), err, "transport: error while dialing: %v", err)
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}
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return nil, connectionErrorf(true, err, "transport: Error while dialing %v", err)
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}
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// Any further errors will close the underlying connection
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defer func(conn net.Conn) {
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if err != nil {
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conn.Close()
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}
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}(conn)
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var (
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isSecure bool
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authInfo credentials.AuthInfo
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)
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if creds := opts.TransportCredentials; creds != nil {
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scheme = "https"
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conn, authInfo, err = creds.ClientHandshake(connectCtx, addr.Authority, conn)
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if err != nil {
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return nil, connectionErrorf(isTemporary(err), err, "transport: authentication handshake failed: %v", err)
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}
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isSecure = true
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}
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kp := opts.KeepaliveParams
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// Validate keepalive parameters.
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if kp.Time == 0 {
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kp.Time = defaultClientKeepaliveTime
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}
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if kp.Timeout == 0 {
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kp.Timeout = defaultClientKeepaliveTimeout
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}
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dynamicWindow := true
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icwz := int32(initialWindowSize)
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if opts.InitialConnWindowSize >= defaultWindowSize {
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icwz = opts.InitialConnWindowSize
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dynamicWindow = false
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}
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writeBufSize := defaultWriteBufSize
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if opts.WriteBufferSize > 0 {
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writeBufSize = opts.WriteBufferSize
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}
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readBufSize := defaultReadBufSize
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if opts.ReadBufferSize > 0 {
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readBufSize = opts.ReadBufferSize
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}
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t := &http2Client{
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ctx: ctx,
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ctxDone: ctx.Done(), // Cache Done chan.
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cancel: cancel,
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userAgent: opts.UserAgent,
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md: addr.Metadata,
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conn: conn,
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remoteAddr: conn.RemoteAddr(),
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localAddr: conn.LocalAddr(),
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authInfo: authInfo,
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readerDone: make(chan struct{}),
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writerDone: make(chan struct{}),
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goAway: make(chan struct{}),
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awakenKeepalive: make(chan struct{}, 1),
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framer: newFramer(conn, writeBufSize, readBufSize),
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fc: &trInFlow{limit: uint32(icwz)},
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scheme: scheme,
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activeStreams: make(map[uint32]*Stream),
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isSecure: isSecure,
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creds: opts.PerRPCCredentials,
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kp: kp,
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statsHandler: opts.StatsHandler,
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initialWindowSize: initialWindowSize,
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onSuccess: onSuccess,
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nextID: 1,
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maxConcurrentStreams: defaultMaxStreamsClient,
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streamQuota: defaultMaxStreamsClient,
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streamsQuotaAvailable: make(chan struct{}, 1),
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}
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t.controlBuf = newControlBuffer(t.ctxDone)
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if opts.InitialWindowSize >= defaultWindowSize {
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t.initialWindowSize = opts.InitialWindowSize
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dynamicWindow = false
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}
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if dynamicWindow {
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t.bdpEst = &bdpEstimator{
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bdp: initialWindowSize,
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updateFlowControl: t.updateFlowControl,
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}
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}
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// Make sure awakenKeepalive can't be written upon.
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// keepalive routine will make it writable, if need be.
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t.awakenKeepalive <- struct{}{}
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if t.statsHandler != nil {
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t.ctx = t.statsHandler.TagConn(t.ctx, &stats.ConnTagInfo{
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RemoteAddr: t.remoteAddr,
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LocalAddr: t.localAddr,
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})
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connBegin := &stats.ConnBegin{
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Client: true,
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}
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t.statsHandler.HandleConn(t.ctx, connBegin)
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}
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if channelz.IsOn() {
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t.channelzID = channelz.RegisterNormalSocket(t, opts.ChannelzParentID, "")
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}
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if t.kp.Time != infinity {
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t.keepaliveEnabled = true
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go t.keepalive()
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}
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// Start the reader goroutine for incoming message. Each transport has
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// a dedicated goroutine which reads HTTP2 frame from network. Then it
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// dispatches the frame to the corresponding stream entity.
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go t.reader()
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// Send connection preface to server.
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n, err := t.conn.Write(clientPreface)
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if err != nil {
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t.Close()
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return nil, connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
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}
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if n != len(clientPreface) {
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t.Close()
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return nil, connectionErrorf(true, err, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
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}
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if t.initialWindowSize != defaultWindowSize {
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err = t.framer.fr.WriteSettings(http2.Setting{
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ID: http2.SettingInitialWindowSize,
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Val: uint32(t.initialWindowSize),
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})
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} else {
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err = t.framer.fr.WriteSettings()
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}
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if err != nil {
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t.Close()
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return nil, connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
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}
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// Adjust the connection flow control window if needed.
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if delta := uint32(icwz - defaultWindowSize); delta > 0 {
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if err := t.framer.fr.WriteWindowUpdate(0, delta); err != nil {
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t.Close()
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return nil, connectionErrorf(true, err, "transport: failed to write window update: %v", err)
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}
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}
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t.framer.writer.Flush()
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go func() {
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t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst)
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err := t.loopy.run()
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if err != nil {
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errorf("transport: loopyWriter.run returning. Err: %v", err)
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}
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// If it's a connection error, let reader goroutine handle it
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// since there might be data in the buffers.
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if _, ok := err.(net.Error); !ok {
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t.conn.Close()
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}
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close(t.writerDone)
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}()
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return t, nil
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}
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func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
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// TODO(zhaoq): Handle uint32 overflow of Stream.id.
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s := &Stream{
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done: make(chan struct{}),
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method: callHdr.Method,
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sendCompress: callHdr.SendCompress,
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buf: newRecvBuffer(),
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headerChan: make(chan struct{}),
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contentSubtype: callHdr.ContentSubtype,
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}
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s.wq = newWriteQuota(defaultWriteQuota, s.done)
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s.requestRead = func(n int) {
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t.adjustWindow(s, uint32(n))
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}
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// The client side stream context should have exactly the same life cycle with the user provided context.
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// That means, s.ctx should be read-only. And s.ctx is done iff ctx is done.
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// So we use the original context here instead of creating a copy.
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s.ctx = ctx
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s.trReader = &transportReader{
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reader: &recvBufferReader{
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ctx: s.ctx,
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ctxDone: s.ctx.Done(),
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recv: s.buf,
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},
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windowHandler: func(n int) {
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t.updateWindow(s, uint32(n))
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},
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}
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return s
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}
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func (t *http2Client) getPeer() *peer.Peer {
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pr := &peer.Peer{
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Addr: t.remoteAddr,
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}
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// Attach Auth info if there is any.
|
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if t.authInfo != nil {
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pr.AuthInfo = t.authInfo
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}
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return pr
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}
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func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr) ([]hpack.HeaderField, error) {
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aud := t.createAudience(callHdr)
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authData, err := t.getTrAuthData(ctx, aud)
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if err != nil {
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return nil, err
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}
|
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callAuthData, err := t.getCallAuthData(ctx, aud, callHdr)
|
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if err != nil {
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return nil, err
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}
|
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// TODO(mmukhi): Benchmark if the performance gets better if count the metadata and other header fields
|
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// first and create a slice of that exact size.
|
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// Make the slice of certain predictable size to reduce allocations made by append.
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hfLen := 7 // :method, :scheme, :path, :authority, content-type, user-agent, te
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hfLen += len(authData) + len(callAuthData)
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headerFields := make([]hpack.HeaderField, 0, hfLen)
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headerFields = append(headerFields, hpack.HeaderField{Name: ":method", Value: "POST"})
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headerFields = append(headerFields, hpack.HeaderField{Name: ":scheme", Value: t.scheme})
|
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headerFields = append(headerFields, hpack.HeaderField{Name: ":path", Value: callHdr.Method})
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headerFields = append(headerFields, hpack.HeaderField{Name: ":authority", Value: callHdr.Host})
|
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headerFields = append(headerFields, hpack.HeaderField{Name: "content-type", Value: contentType(callHdr.ContentSubtype)})
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headerFields = append(headerFields, hpack.HeaderField{Name: "user-agent", Value: t.userAgent})
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headerFields = append(headerFields, hpack.HeaderField{Name: "te", Value: "trailers"})
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|
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if callHdr.SendCompress != "" {
|
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headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-encoding", Value: callHdr.SendCompress})
|
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}
|
|
if dl, ok := ctx.Deadline(); ok {
|
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// Send out timeout regardless its value. The server can detect timeout context by itself.
|
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// TODO(mmukhi): Perhaps this field should be updated when actually writing out to the wire.
|
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timeout := dl.Sub(time.Now())
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headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-timeout", Value: encodeTimeout(timeout)})
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}
|
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for k, v := range authData {
|
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headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
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}
|
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for k, v := range callAuthData {
|
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headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
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}
|
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if b := stats.OutgoingTags(ctx); b != nil {
|
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headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-tags-bin", Value: encodeBinHeader(b)})
|
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}
|
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if b := stats.OutgoingTrace(ctx); b != nil {
|
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headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-trace-bin", Value: encodeBinHeader(b)})
|
|
}
|
|
|
|
if md, added, ok := metadata.FromOutgoingContextRaw(ctx); ok {
|
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var k string
|
|
for _, vv := range added {
|
|
for i, v := range vv {
|
|
if i%2 == 0 {
|
|
k = v
|
|
continue
|
|
}
|
|
// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
|
|
if isReservedHeader(k) {
|
|
continue
|
|
}
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: strings.ToLower(k), Value: encodeMetadataHeader(k, v)})
|
|
}
|
|
}
|
|
for k, vv := range md {
|
|
// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
|
|
if isReservedHeader(k) {
|
|
continue
|
|
}
|
|
for _, v := range vv {
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
|
}
|
|
}
|
|
}
|
|
if md, ok := t.md.(*metadata.MD); ok {
|
|
for k, vv := range *md {
|
|
if isReservedHeader(k) {
|
|
continue
|
|
}
|
|
for _, v := range vv {
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
|
}
|
|
}
|
|
}
|
|
return headerFields, nil
|
|
}
|
|
|
|
func (t *http2Client) createAudience(callHdr *CallHdr) string {
|
|
// Create an audience string only if needed.
|
|
if len(t.creds) == 0 && callHdr.Creds == nil {
|
|
return ""
|
|
}
|
|
// Construct URI required to get auth request metadata.
|
|
// Omit port if it is the default one.
|
|
host := strings.TrimSuffix(callHdr.Host, ":443")
|
|
pos := strings.LastIndex(callHdr.Method, "/")
|
|
if pos == -1 {
|
|
pos = len(callHdr.Method)
|
|
}
|
|
return "https://" + host + callHdr.Method[:pos]
|
|
}
|
|
|
|
func (t *http2Client) getTrAuthData(ctx context.Context, audience string) (map[string]string, error) {
|
|
authData := map[string]string{}
|
|
for _, c := range t.creds {
|
|
data, err := c.GetRequestMetadata(ctx, audience)
|
|
if err != nil {
|
|
if _, ok := status.FromError(err); ok {
|
|
return nil, err
|
|
}
|
|
|
|
return nil, streamErrorf(codes.Unauthenticated, "transport: %v", err)
|
|
}
|
|
for k, v := range data {
|
|
// Capital header names are illegal in HTTP/2.
|
|
k = strings.ToLower(k)
|
|
authData[k] = v
|
|
}
|
|
}
|
|
return authData, nil
|
|
}
|
|
|
|
func (t *http2Client) getCallAuthData(ctx context.Context, audience string, callHdr *CallHdr) (map[string]string, error) {
|
|
callAuthData := map[string]string{}
|
|
// Check if credentials.PerRPCCredentials were provided via call options.
|
|
// Note: if these credentials are provided both via dial options and call
|
|
// options, then both sets of credentials will be applied.
|
|
if callCreds := callHdr.Creds; callCreds != nil {
|
|
if !t.isSecure && callCreds.RequireTransportSecurity() {
|
|
return nil, streamErrorf(codes.Unauthenticated, "transport: cannot send secure credentials on an insecure connection")
|
|
}
|
|
data, err := callCreds.GetRequestMetadata(ctx, audience)
|
|
if err != nil {
|
|
return nil, streamErrorf(codes.Internal, "transport: %v", err)
|
|
}
|
|
for k, v := range data {
|
|
// Capital header names are illegal in HTTP/2
|
|
k = strings.ToLower(k)
|
|
callAuthData[k] = v
|
|
}
|
|
}
|
|
return callAuthData, nil
|
|
}
|
|
|
|
// NewStream creates a stream and registers it into the transport as "active"
|
|
// streams.
|
|
func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Stream, err error) {
|
|
ctx = peer.NewContext(ctx, t.getPeer())
|
|
headerFields, err := t.createHeaderFields(ctx, callHdr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s := t.newStream(ctx, callHdr)
|
|
cleanup := func(err error) {
|
|
if s.swapState(streamDone) == streamDone {
|
|
// If it was already done, return.
|
|
return
|
|
}
|
|
// The stream was unprocessed by the server.
|
|
atomic.StoreUint32(&s.unprocessed, 1)
|
|
s.write(recvMsg{err: err})
|
|
close(s.done)
|
|
// If headerChan isn't closed, then close it.
|
|
if atomic.SwapUint32(&s.headerDone, 1) == 0 {
|
|
close(s.headerChan)
|
|
}
|
|
|
|
}
|
|
hdr := &headerFrame{
|
|
hf: headerFields,
|
|
endStream: false,
|
|
initStream: func(id uint32) (bool, error) {
|
|
t.mu.Lock()
|
|
if state := t.state; state != reachable {
|
|
t.mu.Unlock()
|
|
// Do a quick cleanup.
|
|
err := error(errStreamDrain)
|
|
if state == closing {
|
|
err = ErrConnClosing
|
|
}
|
|
cleanup(err)
|
|
return false, err
|
|
}
|
|
t.activeStreams[id] = s
|
|
if channelz.IsOn() {
|
|
t.czmu.Lock()
|
|
t.streamsStarted++
|
|
t.lastStreamCreated = time.Now()
|
|
t.czmu.Unlock()
|
|
}
|
|
var sendPing bool
|
|
// If the number of active streams change from 0 to 1, then check if keepalive
|
|
// has gone dormant. If so, wake it up.
|
|
if len(t.activeStreams) == 1 && t.keepaliveEnabled {
|
|
select {
|
|
case t.awakenKeepalive <- struct{}{}:
|
|
sendPing = true
|
|
// Fill the awakenKeepalive channel again as this channel must be
|
|
// kept non-writable except at the point that the keepalive()
|
|
// goroutine is waiting either to be awaken or shutdown.
|
|
t.awakenKeepalive <- struct{}{}
|
|
default:
|
|
}
|
|
}
|
|
t.mu.Unlock()
|
|
return sendPing, nil
|
|
},
|
|
onOrphaned: cleanup,
|
|
wq: s.wq,
|
|
}
|
|
firstTry := true
|
|
var ch chan struct{}
|
|
checkForStreamQuota := func(it interface{}) bool {
|
|
if t.streamQuota <= 0 { // Can go negative if server decreases it.
|
|
if firstTry {
|
|
t.waitingStreams++
|
|
}
|
|
ch = t.streamsQuotaAvailable
|
|
return false
|
|
}
|
|
if !firstTry {
|
|
t.waitingStreams--
|
|
}
|
|
t.streamQuota--
|
|
h := it.(*headerFrame)
|
|
h.streamID = t.nextID
|
|
t.nextID += 2
|
|
s.id = h.streamID
|
|
s.fc = &inFlow{limit: uint32(t.initialWindowSize)}
|
|
if t.streamQuota > 0 && t.waitingStreams > 0 {
|
|
select {
|
|
case t.streamsQuotaAvailable <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
for {
|
|
success, err := t.controlBuf.executeAndPut(checkForStreamQuota, hdr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if success {
|
|
break
|
|
}
|
|
firstTry = false
|
|
select {
|
|
case <-ch:
|
|
case <-s.ctx.Done():
|
|
return nil, ContextErr(s.ctx.Err())
|
|
case <-t.goAway:
|
|
return nil, errStreamDrain
|
|
case <-t.ctx.Done():
|
|
return nil, ErrConnClosing
|
|
}
|
|
}
|
|
if t.statsHandler != nil {
|
|
outHeader := &stats.OutHeader{
|
|
Client: true,
|
|
FullMethod: callHdr.Method,
|
|
RemoteAddr: t.remoteAddr,
|
|
LocalAddr: t.localAddr,
|
|
Compression: callHdr.SendCompress,
|
|
}
|
|
t.statsHandler.HandleRPC(s.ctx, outHeader)
|
|
}
|
|
return s, nil
|
|
}
|
|
|
|
// CloseStream clears the footprint of a stream when the stream is not needed any more.
|
|
// This must not be executed in reader's goroutine.
|
|
func (t *http2Client) CloseStream(s *Stream, err error) {
|
|
var (
|
|
rst bool
|
|
rstCode http2.ErrCode
|
|
)
|
|
if err != nil {
|
|
rst = true
|
|
rstCode = http2.ErrCodeCancel
|
|
}
|
|
t.closeStream(s, err, rst, rstCode, nil, nil, false)
|
|
}
|
|
|
|
func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.ErrCode, st *status.Status, mdata map[string][]string, eosReceived bool) {
|
|
// Set stream status to done.
|
|
if s.swapState(streamDone) == streamDone {
|
|
// If it was already done, return.
|
|
return
|
|
}
|
|
// status and trailers can be updated here without any synchronization because the stream goroutine will
|
|
// only read it after it sees an io.EOF error from read or write and we'll write those errors
|
|
// only after updating this.
|
|
s.status = st
|
|
if len(mdata) > 0 {
|
|
s.trailer = mdata
|
|
}
|
|
if err != nil {
|
|
// This will unblock reads eventually.
|
|
s.write(recvMsg{err: err})
|
|
}
|
|
// This will unblock write.
|
|
close(s.done)
|
|
// If headerChan isn't closed, then close it.
|
|
if atomic.SwapUint32(&s.headerDone, 1) == 0 {
|
|
close(s.headerChan)
|
|
}
|
|
cleanup := &cleanupStream{
|
|
streamID: s.id,
|
|
onWrite: func() {
|
|
t.mu.Lock()
|
|
if t.activeStreams != nil {
|
|
delete(t.activeStreams, s.id)
|
|
}
|
|
t.mu.Unlock()
|
|
if channelz.IsOn() {
|
|
t.czmu.Lock()
|
|
if eosReceived {
|
|
t.streamsSucceeded++
|
|
} else {
|
|
t.streamsFailed++
|
|
}
|
|
t.czmu.Unlock()
|
|
}
|
|
},
|
|
rst: rst,
|
|
rstCode: rstCode,
|
|
}
|
|
addBackStreamQuota := func(interface{}) bool {
|
|
t.streamQuota++
|
|
if t.streamQuota > 0 && t.waitingStreams > 0 {
|
|
select {
|
|
case t.streamsQuotaAvailable <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
t.controlBuf.executeAndPut(addBackStreamQuota, cleanup)
|
|
}
|
|
|
|
// Close kicks off the shutdown process of the transport. This should be called
|
|
// only once on a transport. Once it is called, the transport should not be
|
|
// accessed any more.
|
|
func (t *http2Client) Close() error {
|
|
t.mu.Lock()
|
|
// Make sure we only Close once.
|
|
if t.state == closing {
|
|
t.mu.Unlock()
|
|
return nil
|
|
}
|
|
t.state = closing
|
|
streams := t.activeStreams
|
|
t.activeStreams = nil
|
|
t.mu.Unlock()
|
|
t.controlBuf.finish()
|
|
t.cancel()
|
|
err := t.conn.Close()
|
|
if channelz.IsOn() {
|
|
channelz.RemoveEntry(t.channelzID)
|
|
}
|
|
// Notify all active streams.
|
|
for _, s := range streams {
|
|
t.closeStream(s, ErrConnClosing, false, http2.ErrCodeNo, nil, nil, false)
|
|
}
|
|
if t.statsHandler != nil {
|
|
connEnd := &stats.ConnEnd{
|
|
Client: true,
|
|
}
|
|
t.statsHandler.HandleConn(t.ctx, connEnd)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// GracefulClose sets the state to draining, which prevents new streams from
|
|
// being created and causes the transport to be closed when the last active
|
|
// stream is closed. If there are no active streams, the transport is closed
|
|
// immediately. This does nothing if the transport is already draining or
|
|
// closing.
|
|
func (t *http2Client) GracefulClose() error {
|
|
t.mu.Lock()
|
|
// Make sure we move to draining only from active.
|
|
if t.state == draining || t.state == closing {
|
|
t.mu.Unlock()
|
|
return nil
|
|
}
|
|
t.state = draining
|
|
active := len(t.activeStreams)
|
|
t.mu.Unlock()
|
|
if active == 0 {
|
|
return t.Close()
|
|
}
|
|
t.controlBuf.put(&incomingGoAway{})
|
|
return nil
|
|
}
|
|
|
|
// Write formats the data into HTTP2 data frame(s) and sends it out. The caller
|
|
// should proceed only if Write returns nil.
|
|
func (t *http2Client) Write(s *Stream, hdr []byte, data []byte, opts *Options) error {
|
|
if opts.Last {
|
|
// If it's the last message, update stream state.
|
|
if !s.compareAndSwapState(streamActive, streamWriteDone) {
|
|
return errStreamDone
|
|
}
|
|
} else if s.getState() != streamActive {
|
|
return errStreamDone
|
|
}
|
|
df := &dataFrame{
|
|
streamID: s.id,
|
|
endStream: opts.Last,
|
|
}
|
|
if hdr != nil || data != nil { // If it's not an empty data frame.
|
|
// Add some data to grpc message header so that we can equally
|
|
// distribute bytes across frames.
|
|
emptyLen := http2MaxFrameLen - len(hdr)
|
|
if emptyLen > len(data) {
|
|
emptyLen = len(data)
|
|
}
|
|
hdr = append(hdr, data[:emptyLen]...)
|
|
data = data[emptyLen:]
|
|
df.h, df.d = hdr, data
|
|
// TODO(mmukhi): The above logic in this if can be moved to loopyWriter's data handler.
|
|
if err := s.wq.get(int32(len(hdr) + len(data))); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return t.controlBuf.put(df)
|
|
}
|
|
|
|
func (t *http2Client) getStream(f http2.Frame) (*Stream, bool) {
|
|
t.mu.Lock()
|
|
defer t.mu.Unlock()
|
|
s, ok := t.activeStreams[f.Header().StreamID]
|
|
return s, ok
|
|
}
|
|
|
|
// adjustWindow sends out extra window update over the initial window size
|
|
// of stream if the application is requesting data larger in size than
|
|
// the window.
|
|
func (t *http2Client) adjustWindow(s *Stream, n uint32) {
|
|
if w := s.fc.maybeAdjust(n); w > 0 {
|
|
t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id, increment: w})
|
|
}
|
|
}
|
|
|
|
// updateWindow adjusts the inbound quota for the stream.
|
|
// Window updates will be sent out when the cumulative quota
|
|
// exceeds the corresponding threshold.
|
|
func (t *http2Client) updateWindow(s *Stream, n uint32) {
|
|
if w := s.fc.onRead(n); w > 0 {
|
|
t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id, increment: w})
|
|
}
|
|
}
|
|
|
|
// updateFlowControl updates the incoming flow control windows
|
|
// for the transport and the stream based on the current bdp
|
|
// estimation.
|
|
func (t *http2Client) updateFlowControl(n uint32) {
|
|
t.mu.Lock()
|
|
for _, s := range t.activeStreams {
|
|
s.fc.newLimit(n)
|
|
}
|
|
t.mu.Unlock()
|
|
updateIWS := func(interface{}) bool {
|
|
t.initialWindowSize = int32(n)
|
|
return true
|
|
}
|
|
t.controlBuf.executeAndPut(updateIWS, &outgoingWindowUpdate{streamID: 0, increment: t.fc.newLimit(n)})
|
|
t.controlBuf.put(&outgoingSettings{
|
|
ss: []http2.Setting{
|
|
{
|
|
ID: http2.SettingInitialWindowSize,
|
|
Val: n,
|
|
},
|
|
},
|
|
})
|
|
}
|
|
|
|
func (t *http2Client) handleData(f *http2.DataFrame) {
|
|
size := f.Header().Length
|
|
var sendBDPPing bool
|
|
if t.bdpEst != nil {
|
|
sendBDPPing = t.bdpEst.add(size)
|
|
}
|
|
// Decouple connection's flow control from application's read.
|
|
// An update on connection's flow control should not depend on
|
|
// whether user application has read the data or not. Such a
|
|
// restriction is already imposed on the stream's flow control,
|
|
// and therefore the sender will be blocked anyways.
|
|
// Decoupling the connection flow control will prevent other
|
|
// active(fast) streams from starving in presence of slow or
|
|
// inactive streams.
|
|
//
|
|
if w := t.fc.onData(size); w > 0 {
|
|
t.controlBuf.put(&outgoingWindowUpdate{
|
|
streamID: 0,
|
|
increment: w,
|
|
})
|
|
}
|
|
if sendBDPPing {
|
|
// Avoid excessive ping detection (e.g. in an L7 proxy)
|
|
// by sending a window update prior to the BDP ping.
|
|
|
|
if w := t.fc.reset(); w > 0 {
|
|
t.controlBuf.put(&outgoingWindowUpdate{
|
|
streamID: 0,
|
|
increment: w,
|
|
})
|
|
}
|
|
|
|
t.controlBuf.put(bdpPing)
|
|
}
|
|
// Select the right stream to dispatch.
|
|
s, ok := t.getStream(f)
|
|
if !ok {
|
|
return
|
|
}
|
|
if size > 0 {
|
|
if err := s.fc.onData(size); err != nil {
|
|
t.closeStream(s, io.EOF, true, http2.ErrCodeFlowControl, status.New(codes.Internal, err.Error()), nil, false)
|
|
return
|
|
}
|
|
if f.Header().Flags.Has(http2.FlagDataPadded) {
|
|
if w := s.fc.onRead(size - uint32(len(f.Data()))); w > 0 {
|
|
t.controlBuf.put(&outgoingWindowUpdate{s.id, w})
|
|
}
|
|
}
|
|
// TODO(bradfitz, zhaoq): A copy is required here because there is no
|
|
// guarantee f.Data() is consumed before the arrival of next frame.
|
|
// Can this copy be eliminated?
|
|
if len(f.Data()) > 0 {
|
|
data := make([]byte, len(f.Data()))
|
|
copy(data, f.Data())
|
|
s.write(recvMsg{data: data})
|
|
}
|
|
}
|
|
// The server has closed the stream without sending trailers. Record that
|
|
// the read direction is closed, and set the status appropriately.
|
|
if f.FrameHeader.Flags.Has(http2.FlagDataEndStream) {
|
|
t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.New(codes.Internal, "server closed the stream without sending trailers"), nil, true)
|
|
}
|
|
}
|
|
|
|
func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
|
|
s, ok := t.getStream(f)
|
|
if !ok {
|
|
return
|
|
}
|
|
if f.ErrCode == http2.ErrCodeRefusedStream {
|
|
// The stream was unprocessed by the server.
|
|
atomic.StoreUint32(&s.unprocessed, 1)
|
|
}
|
|
statusCode, ok := http2ErrConvTab[f.ErrCode]
|
|
if !ok {
|
|
warningf("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error %v", f.ErrCode)
|
|
statusCode = codes.Unknown
|
|
}
|
|
t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.Newf(statusCode, "stream terminated by RST_STREAM with error code: %v", f.ErrCode), nil, false)
|
|
}
|
|
|
|
func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
|
|
if f.IsAck() {
|
|
return
|
|
}
|
|
var maxStreams *uint32
|
|
var ss []http2.Setting
|
|
f.ForeachSetting(func(s http2.Setting) error {
|
|
if s.ID == http2.SettingMaxConcurrentStreams {
|
|
maxStreams = new(uint32)
|
|
*maxStreams = s.Val
|
|
return nil
|
|
}
|
|
ss = append(ss, s)
|
|
return nil
|
|
})
|
|
if isFirst && maxStreams == nil {
|
|
maxStreams = new(uint32)
|
|
*maxStreams = math.MaxUint32
|
|
}
|
|
sf := &incomingSettings{
|
|
ss: ss,
|
|
}
|
|
if maxStreams == nil {
|
|
t.controlBuf.put(sf)
|
|
return
|
|
}
|
|
updateStreamQuota := func(interface{}) bool {
|
|
delta := int64(*maxStreams) - int64(t.maxConcurrentStreams)
|
|
t.maxConcurrentStreams = *maxStreams
|
|
t.streamQuota += delta
|
|
if delta > 0 && t.waitingStreams > 0 {
|
|
close(t.streamsQuotaAvailable) // wake all of them up.
|
|
t.streamsQuotaAvailable = make(chan struct{}, 1)
|
|
}
|
|
return true
|
|
}
|
|
t.controlBuf.executeAndPut(updateStreamQuota, sf)
|
|
}
|
|
|
|
func (t *http2Client) handlePing(f *http2.PingFrame) {
|
|
if f.IsAck() {
|
|
// Maybe it's a BDP ping.
|
|
if t.bdpEst != nil {
|
|
t.bdpEst.calculate(f.Data)
|
|
}
|
|
return
|
|
}
|
|
pingAck := &ping{ack: true}
|
|
copy(pingAck.data[:], f.Data[:])
|
|
t.controlBuf.put(pingAck)
|
|
}
|
|
|
|
func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
|
|
t.mu.Lock()
|
|
if t.state == closing {
|
|
t.mu.Unlock()
|
|
return
|
|
}
|
|
if f.ErrCode == http2.ErrCodeEnhanceYourCalm {
|
|
infof("Client received GoAway with http2.ErrCodeEnhanceYourCalm.")
|
|
}
|
|
id := f.LastStreamID
|
|
if id > 0 && id%2 != 1 {
|
|
t.mu.Unlock()
|
|
t.Close()
|
|
return
|
|
}
|
|
// A client can receive multiple GoAways from the server (see
|
|
// https://github.com/grpc/grpc-go/issues/1387). The idea is that the first
|
|
// GoAway will be sent with an ID of MaxInt32 and the second GoAway will be
|
|
// sent after an RTT delay with the ID of the last stream the server will
|
|
// process.
|
|
//
|
|
// Therefore, when we get the first GoAway we don't necessarily close any
|
|
// streams. While in case of second GoAway we close all streams created after
|
|
// the GoAwayId. This way streams that were in-flight while the GoAway from
|
|
// server was being sent don't get killed.
|
|
select {
|
|
case <-t.goAway: // t.goAway has been closed (i.e.,multiple GoAways).
|
|
// If there are multiple GoAways the first one should always have an ID greater than the following ones.
|
|
if id > t.prevGoAwayID {
|
|
t.mu.Unlock()
|
|
t.Close()
|
|
return
|
|
}
|
|
default:
|
|
t.setGoAwayReason(f)
|
|
close(t.goAway)
|
|
t.state = draining
|
|
t.controlBuf.put(&incomingGoAway{})
|
|
}
|
|
// All streams with IDs greater than the GoAwayId
|
|
// and smaller than the previous GoAway ID should be killed.
|
|
upperLimit := t.prevGoAwayID
|
|
if upperLimit == 0 { // This is the first GoAway Frame.
|
|
upperLimit = math.MaxUint32 // Kill all streams after the GoAway ID.
|
|
}
|
|
for streamID, stream := range t.activeStreams {
|
|
if streamID > id && streamID <= upperLimit {
|
|
// The stream was unprocessed by the server.
|
|
atomic.StoreUint32(&stream.unprocessed, 1)
|
|
t.closeStream(stream, errStreamDrain, false, http2.ErrCodeNo, statusGoAway, nil, false)
|
|
}
|
|
}
|
|
t.prevGoAwayID = id
|
|
active := len(t.activeStreams)
|
|
t.mu.Unlock()
|
|
if active == 0 {
|
|
t.Close()
|
|
}
|
|
}
|
|
|
|
// setGoAwayReason sets the value of t.goAwayReason based
|
|
// on the GoAway frame received.
|
|
// It expects a lock on transport's mutext to be held by
|
|
// the caller.
|
|
func (t *http2Client) setGoAwayReason(f *http2.GoAwayFrame) {
|
|
t.goAwayReason = GoAwayNoReason
|
|
switch f.ErrCode {
|
|
case http2.ErrCodeEnhanceYourCalm:
|
|
if string(f.DebugData()) == "too_many_pings" {
|
|
t.goAwayReason = GoAwayTooManyPings
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *http2Client) GetGoAwayReason() GoAwayReason {
|
|
t.mu.Lock()
|
|
defer t.mu.Unlock()
|
|
return t.goAwayReason
|
|
}
|
|
|
|
func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
|
|
t.controlBuf.put(&incomingWindowUpdate{
|
|
streamID: f.Header().StreamID,
|
|
increment: f.Increment,
|
|
})
|
|
}
|
|
|
|
// operateHeaders takes action on the decoded headers.
|
|
func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
|
|
s, ok := t.getStream(frame)
|
|
if !ok {
|
|
return
|
|
}
|
|
atomic.StoreUint32(&s.bytesReceived, 1)
|
|
var state decodeState
|
|
if err := state.decodeResponseHeader(frame); err != nil {
|
|
t.closeStream(s, err, true, http2.ErrCodeProtocol, nil, nil, false)
|
|
// Something wrong. Stops reading even when there is remaining.
|
|
return
|
|
}
|
|
|
|
endStream := frame.StreamEnded()
|
|
var isHeader bool
|
|
defer func() {
|
|
if t.statsHandler != nil {
|
|
if isHeader {
|
|
inHeader := &stats.InHeader{
|
|
Client: true,
|
|
WireLength: int(frame.Header().Length),
|
|
}
|
|
t.statsHandler.HandleRPC(s.ctx, inHeader)
|
|
} else {
|
|
inTrailer := &stats.InTrailer{
|
|
Client: true,
|
|
WireLength: int(frame.Header().Length),
|
|
}
|
|
t.statsHandler.HandleRPC(s.ctx, inTrailer)
|
|
}
|
|
}
|
|
}()
|
|
// If headers haven't been received yet.
|
|
if atomic.SwapUint32(&s.headerDone, 1) == 0 {
|
|
if !endStream {
|
|
// Headers frame is not actually a trailers-only frame.
|
|
isHeader = true
|
|
// These values can be set without any synchronization because
|
|
// stream goroutine will read it only after seeing a closed
|
|
// headerChan which we'll close after setting this.
|
|
s.recvCompress = state.encoding
|
|
if len(state.mdata) > 0 {
|
|
s.header = state.mdata
|
|
}
|
|
}
|
|
close(s.headerChan)
|
|
}
|
|
if !endStream {
|
|
return
|
|
}
|
|
t.closeStream(s, io.EOF, false, http2.ErrCodeNo, state.status(), state.mdata, true)
|
|
}
|
|
|
|
// reader runs as a separate goroutine in charge of reading data from network
|
|
// connection.
|
|
//
|
|
// TODO(zhaoq): currently one reader per transport. Investigate whether this is
|
|
// optimal.
|
|
// TODO(zhaoq): Check the validity of the incoming frame sequence.
|
|
func (t *http2Client) reader() {
|
|
defer close(t.readerDone)
|
|
// Check the validity of server preface.
|
|
frame, err := t.framer.fr.ReadFrame()
|
|
if err != nil {
|
|
t.Close()
|
|
return
|
|
}
|
|
if t.keepaliveEnabled {
|
|
atomic.CompareAndSwapUint32(&t.activity, 0, 1)
|
|
}
|
|
sf, ok := frame.(*http2.SettingsFrame)
|
|
if !ok {
|
|
t.Close()
|
|
return
|
|
}
|
|
t.onSuccess()
|
|
t.handleSettings(sf, true)
|
|
|
|
// loop to keep reading incoming messages on this transport.
|
|
for {
|
|
frame, err := t.framer.fr.ReadFrame()
|
|
if t.keepaliveEnabled {
|
|
atomic.CompareAndSwapUint32(&t.activity, 0, 1)
|
|
}
|
|
if err != nil {
|
|
// Abort an active stream if the http2.Framer returns a
|
|
// http2.StreamError. This can happen only if the server's response
|
|
// is malformed http2.
|
|
if se, ok := err.(http2.StreamError); ok {
|
|
t.mu.Lock()
|
|
s := t.activeStreams[se.StreamID]
|
|
t.mu.Unlock()
|
|
if s != nil {
|
|
// use error detail to provide better err message
|
|
t.closeStream(s, streamErrorf(http2ErrConvTab[se.Code], "%v", t.framer.fr.ErrorDetail()), true, http2.ErrCodeProtocol, nil, nil, false)
|
|
}
|
|
continue
|
|
} else {
|
|
// Transport error.
|
|
t.Close()
|
|
return
|
|
}
|
|
}
|
|
switch frame := frame.(type) {
|
|
case *http2.MetaHeadersFrame:
|
|
t.operateHeaders(frame)
|
|
case *http2.DataFrame:
|
|
t.handleData(frame)
|
|
case *http2.RSTStreamFrame:
|
|
t.handleRSTStream(frame)
|
|
case *http2.SettingsFrame:
|
|
t.handleSettings(frame, false)
|
|
case *http2.PingFrame:
|
|
t.handlePing(frame)
|
|
case *http2.GoAwayFrame:
|
|
t.handleGoAway(frame)
|
|
case *http2.WindowUpdateFrame:
|
|
t.handleWindowUpdate(frame)
|
|
default:
|
|
errorf("transport: http2Client.reader got unhandled frame type %v.", frame)
|
|
}
|
|
}
|
|
}
|
|
|
|
// keepalive running in a separate goroutune makes sure the connection is alive by sending pings.
|
|
func (t *http2Client) keepalive() {
|
|
p := &ping{data: [8]byte{}}
|
|
timer := time.NewTimer(t.kp.Time)
|
|
for {
|
|
select {
|
|
case <-timer.C:
|
|
if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
|
|
timer.Reset(t.kp.Time)
|
|
continue
|
|
}
|
|
// Check if keepalive should go dormant.
|
|
t.mu.Lock()
|
|
if len(t.activeStreams) < 1 && !t.kp.PermitWithoutStream {
|
|
// Make awakenKeepalive writable.
|
|
<-t.awakenKeepalive
|
|
t.mu.Unlock()
|
|
select {
|
|
case <-t.awakenKeepalive:
|
|
// If the control gets here a ping has been sent
|
|
// need to reset the timer with keepalive.Timeout.
|
|
case <-t.ctx.Done():
|
|
return
|
|
}
|
|
} else {
|
|
t.mu.Unlock()
|
|
if channelz.IsOn() {
|
|
t.czmu.Lock()
|
|
t.kpCount++
|
|
t.czmu.Unlock()
|
|
}
|
|
// Send ping.
|
|
t.controlBuf.put(p)
|
|
}
|
|
|
|
// By the time control gets here a ping has been sent one way or the other.
|
|
timer.Reset(t.kp.Timeout)
|
|
select {
|
|
case <-timer.C:
|
|
if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
|
|
timer.Reset(t.kp.Time)
|
|
continue
|
|
}
|
|
t.Close()
|
|
return
|
|
case <-t.ctx.Done():
|
|
if !timer.Stop() {
|
|
<-timer.C
|
|
}
|
|
return
|
|
}
|
|
case <-t.ctx.Done():
|
|
if !timer.Stop() {
|
|
<-timer.C
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (t *http2Client) Error() <-chan struct{} {
|
|
return t.ctx.Done()
|
|
}
|
|
|
|
func (t *http2Client) GoAway() <-chan struct{} {
|
|
return t.goAway
|
|
}
|
|
|
|
func (t *http2Client) ChannelzMetric() *channelz.SocketInternalMetric {
|
|
t.czmu.RLock()
|
|
s := channelz.SocketInternalMetric{
|
|
StreamsStarted: t.streamsStarted,
|
|
StreamsSucceeded: t.streamsSucceeded,
|
|
StreamsFailed: t.streamsFailed,
|
|
MessagesSent: t.msgSent,
|
|
MessagesReceived: t.msgRecv,
|
|
KeepAlivesSent: t.kpCount,
|
|
LastLocalStreamCreatedTimestamp: t.lastStreamCreated,
|
|
LastMessageSentTimestamp: t.lastMsgSent,
|
|
LastMessageReceivedTimestamp: t.lastMsgRecv,
|
|
LocalFlowControlWindow: int64(t.fc.getSize()),
|
|
//socket options
|
|
LocalAddr: t.localAddr,
|
|
RemoteAddr: t.remoteAddr,
|
|
// Security
|
|
// RemoteName :
|
|
}
|
|
t.czmu.RUnlock()
|
|
s.RemoteFlowControlWindow = t.getOutFlowWindow()
|
|
return &s
|
|
}
|
|
|
|
func (t *http2Client) IncrMsgSent() {
|
|
t.czmu.Lock()
|
|
t.msgSent++
|
|
t.lastMsgSent = time.Now()
|
|
t.czmu.Unlock()
|
|
}
|
|
|
|
func (t *http2Client) IncrMsgRecv() {
|
|
t.czmu.Lock()
|
|
t.msgRecv++
|
|
t.lastMsgRecv = time.Now()
|
|
t.czmu.Unlock()
|
|
}
|
|
|
|
func (t *http2Client) getOutFlowWindow() int64 {
|
|
resp := make(chan uint32, 1)
|
|
timer := time.NewTimer(time.Second)
|
|
defer timer.Stop()
|
|
t.controlBuf.put(&outFlowControlSizeRequest{resp})
|
|
select {
|
|
case sz := <-resp:
|
|
return int64(sz)
|
|
case <-t.ctxDone:
|
|
return -1
|
|
case <-timer.C:
|
|
return -2
|
|
}
|
|
}
|
|
|