2017-01-26 15:51:44 +00:00
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/*
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*
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2017-09-30 16:47:47 +00:00
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* Copyright 2014 gRPC authors.
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2017-01-26 15:51:44 +00:00
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*
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2017-09-30 16:47:47 +00:00
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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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2017-01-26 15:51:44 +00:00
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*
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2017-09-30 16:47:47 +00:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2017-01-26 15:51:44 +00:00
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*
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2017-09-30 16:47:47 +00:00
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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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2017-01-26 15:51:44 +00:00
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*
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*/
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package transport
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import (
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"bytes"
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"fmt"
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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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2017-09-30 16:47:47 +00:00
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"sync/atomic"
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2017-01-26 15:51:44 +00:00
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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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2017-09-30 16:47:47 +00:00
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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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2017-09-30 16:47:47 +00:00
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"google.golang.org/grpc/status"
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2017-01-26 15:51:44 +00:00
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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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userAgent string
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md interface{}
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conn net.Conn // underlying communication channel
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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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nextID uint32 // the next stream ID to be used
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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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2017-09-30 16:47:47 +00:00
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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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hBuf *bytes.Buffer // the buffer for HPACK encoding
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hEnc *hpack.Encoder // HPACK encoder
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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 *inFlow
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// sendQuotaPool provides flow control to outbound message.
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sendQuotaPool *quotaPool
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2018-01-03 19:19:49 +00:00
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// localSendQuota limits the amount of data that can be scheduled
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// for writing before it is actually written out.
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localSendQuota *quotaPool
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// streamsQuota limits the max number of concurrent streams.
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streamsQuota *quotaPool
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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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statsHandler stats.Handler
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initialWindowSize int32
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bdpEst *bdpEstimator
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outQuotaVersion uint32
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2018-01-03 19:19:49 +00:00
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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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mu sync.Mutex // guard the following variables
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state transportState // the state of underlying connection
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activeStreams map[uint32]*Stream
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// The max number of concurrent streams
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maxStreams int
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// the per-stream outbound flow control window size set by the peer.
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streamSendQuota uint32
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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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2017-09-30 16:47:47 +00:00
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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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2017-01-26 15:51:44 +00:00
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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 {
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case io.EOF:
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// Connection closures may be resolved upon retry, and are thus
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// treated as temporary.
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return true
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case context.DeadlineExceeded:
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// In Go 1.7, context.DeadlineExceeded implements Timeout(), and this
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// special case is not needed. Until then, we need to keep this
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// clause.
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return true
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}
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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 false
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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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2018-01-03 19:19:49 +00:00
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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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2018-01-03 19:19:49 +00:00
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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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2017-09-30 16:47:47 +00:00
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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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2017-01-26 15:51:44 +00:00
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if err != nil {
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// Credentials handshake errors are typically considered permanent
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// to avoid retrying on e.g. bad certificates.
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temp := isTemporary(err)
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return nil, connectionErrorf(temp, err, "transport: authentication handshake failed: %v", err)
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}
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2017-09-30 16:47:47 +00:00
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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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2017-09-30 16:47:47 +00:00
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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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var buf bytes.Buffer
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2018-01-03 19:19:49 +00:00
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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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2017-01-26 15:51:44 +00:00
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t := &http2Client{
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ctx: ctx,
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2018-01-03 19:19:49 +00:00
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cancel: cancel,
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2017-09-30 16:47:47 +00:00
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userAgent: opts.UserAgent,
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2017-01-26 15:51:44 +00:00
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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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// The client initiated stream id is odd starting from 1.
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2017-09-30 16:47:47 +00:00
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nextID: 1,
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goAway: make(chan struct{}),
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awakenKeepalive: make(chan struct{}, 1),
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hBuf: &buf,
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hEnc: hpack.NewEncoder(&buf),
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2018-01-03 19:19:49 +00:00
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framer: newFramer(conn, writeBufSize, readBufSize),
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2017-09-30 16:47:47 +00:00
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controlBuf: newControlBuffer(),
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fc: &inFlow{limit: uint32(icwz)},
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sendQuotaPool: newQuotaPool(defaultWindowSize),
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2018-01-03 19:19:49 +00:00
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localSendQuota: newQuotaPool(defaultLocalSendQuota),
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2017-09-30 16:47:47 +00:00
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scheme: scheme,
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state: reachable,
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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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maxStreams: defaultMaxStreamsClient,
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streamsQuota: newQuotaPool(defaultMaxStreamsClient),
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streamSendQuota: defaultWindowSize,
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kp: kp,
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statsHandler: opts.StatsHandler,
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initialWindowSize: initialWindowSize,
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2018-01-03 19:19:49 +00:00
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onSuccess: onSuccess,
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2017-09-30 16:47:47 +00:00
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}
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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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2017-01-26 15:51:44 +00:00
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}
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2017-09-30 16:47:47 +00:00
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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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2017-01-26 15:51:44 +00:00
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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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// 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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2017-09-30 16:47:47 +00:00
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return nil, connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
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2017-01-26 15:51:44 +00:00
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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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2017-09-30 16:47:47 +00:00
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if t.initialWindowSize != defaultWindowSize {
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2018-01-03 19:19:49 +00:00
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err = t.framer.fr.WriteSettings(http2.Setting{
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2017-01-26 15:51:44 +00:00
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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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2018-01-03 19:19:49 +00:00
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err = t.framer.fr.WriteSettings()
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2017-01-26 15:51:44 +00:00
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}
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if err != nil {
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t.Close()
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2017-09-30 16:47:47 +00:00
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return nil, connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
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2017-01-26 15:51:44 +00:00
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}
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// Adjust the connection flow control window if needed.
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2017-09-30 16:47:47 +00:00
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if delta := uint32(icwz - defaultWindowSize); delta > 0 {
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2018-01-03 19:19:49 +00:00
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if err := t.framer.fr.WriteWindowUpdate(0, delta); err != nil {
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2017-01-26 15:51:44 +00:00
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t.Close()
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2017-09-30 16:47:47 +00:00
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return nil, connectionErrorf(true, err, "transport: failed to write window update: %v", err)
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2017-01-26 15:51:44 +00:00
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}
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}
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2018-01-03 19:19:49 +00:00
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t.framer.writer.Flush()
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go func() {
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loopyWriter(t.ctx, t.controlBuf, t.itemHandler)
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t.conn.Close()
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}()
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2017-09-30 16:47:47 +00:00
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if t.kp.Time != infinity {
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go t.keepalive()
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}
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2017-01-26 15:51:44 +00:00
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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{
|
2017-10-06 15:29:20 +00:00
|
|
|
id: t.nextID,
|
|
|
|
done: make(chan struct{}),
|
|
|
|
goAway: make(chan struct{}),
|
|
|
|
method: callHdr.Method,
|
|
|
|
sendCompress: callHdr.SendCompress,
|
|
|
|
buf: newRecvBuffer(),
|
|
|
|
fc: &inFlow{limit: uint32(t.initialWindowSize)},
|
|
|
|
sendQuotaPool: newQuotaPool(int(t.streamSendQuota)),
|
|
|
|
headerChan: make(chan struct{}),
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
t.nextID += 2
|
2017-09-30 16:47:47 +00:00
|
|
|
s.requestRead = func(n int) {
|
|
|
|
t.adjustWindow(s, uint32(n))
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
// The client side stream context should have exactly the same life cycle with the user provided context.
|
|
|
|
// That means, s.ctx should be read-only. And s.ctx is done iff ctx is done.
|
|
|
|
// So we use the original context here instead of creating a copy.
|
|
|
|
s.ctx = ctx
|
2017-09-30 16:47:47 +00:00
|
|
|
s.trReader = &transportReader{
|
|
|
|
reader: &recvBufferReader{
|
|
|
|
ctx: s.ctx,
|
|
|
|
goAway: s.goAway,
|
|
|
|
recv: s.buf,
|
|
|
|
},
|
|
|
|
windowHandler: func(n int) {
|
|
|
|
t.updateWindow(s, uint32(n))
|
|
|
|
},
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
s.waiters = waiters{
|
|
|
|
ctx: s.ctx,
|
|
|
|
tctx: t.ctx,
|
|
|
|
done: s.done,
|
|
|
|
goAway: s.goAway,
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
return s
|
|
|
|
}
|
|
|
|
|
2017-09-30 16:47:47 +00:00
|
|
|
// NewStream creates a stream and registers it into the transport as "active"
|
2017-01-26 15:51:44 +00:00
|
|
|
// streams.
|
|
|
|
func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Stream, err error) {
|
|
|
|
pr := &peer.Peer{
|
|
|
|
Addr: t.remoteAddr,
|
|
|
|
}
|
|
|
|
// Attach Auth info if there is any.
|
|
|
|
if t.authInfo != nil {
|
|
|
|
pr.AuthInfo = t.authInfo
|
|
|
|
}
|
|
|
|
ctx = peer.NewContext(ctx, pr)
|
2017-09-30 16:47:47 +00:00
|
|
|
var (
|
|
|
|
authData = make(map[string]string)
|
|
|
|
audience string
|
|
|
|
)
|
|
|
|
// Create an audience string only if needed.
|
|
|
|
if len(t.creds) > 0 || callHdr.Creds != nil {
|
2017-01-26 15:51:44 +00:00
|
|
|
// Construct URI required to get auth request metadata.
|
2017-09-30 16:47:47 +00:00
|
|
|
// Omit port if it is the default one.
|
|
|
|
host := strings.TrimSuffix(callHdr.Host, ":443")
|
2017-01-26 15:51:44 +00:00
|
|
|
pos := strings.LastIndex(callHdr.Method, "/")
|
|
|
|
if pos == -1 {
|
2017-09-30 16:47:47 +00:00
|
|
|
pos = len(callHdr.Method)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
audience = "https://" + host + callHdr.Method[:pos]
|
|
|
|
}
|
|
|
|
for _, c := range t.creds {
|
2017-01-26 15:51:44 +00:00
|
|
|
data, err := c.GetRequestMetadata(ctx, audience)
|
|
|
|
if err != nil {
|
2017-09-30 16:47:47 +00:00
|
|
|
return nil, streamErrorf(codes.Internal, "transport: %v", err)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
for k, v := range data {
|
2017-09-30 16:47:47 +00:00
|
|
|
// Capital header names are illegal in HTTP/2.
|
|
|
|
k = strings.ToLower(k)
|
2017-01-26 15:51:44 +00:00
|
|
|
authData[k] = v
|
|
|
|
}
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
callAuthData := map[string]string{}
|
2017-09-30 16:47:47 +00:00
|
|
|
// 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() {
|
2018-01-03 19:19:49 +00:00
|
|
|
return nil, streamErrorf(codes.Unauthenticated, "transport: cannot send secure credentials on an insecure connection")
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
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
|
|
|
|
}
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Lock()
|
|
|
|
if t.activeStreams == nil {
|
|
|
|
t.mu.Unlock()
|
|
|
|
return nil, ErrConnClosing
|
|
|
|
}
|
|
|
|
if t.state == draining {
|
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
return nil, errStreamDrain
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
if t.state != reachable {
|
|
|
|
t.mu.Unlock()
|
|
|
|
return nil, ErrConnClosing
|
|
|
|
}
|
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
// Get a quota of 1 from streamsQuota.
|
|
|
|
if _, _, err := t.streamsQuota.get(1, waiters{ctx: ctx, tctx: t.ctx}); err != nil {
|
2017-01-26 15:51:44 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
// TODO(mmukhi): Benchmark if the performance gets better if count the metadata and other header fields
|
|
|
|
// first and create a slice of that exact size.
|
|
|
|
// Make the slice of certain predictable size to reduce allocations made by append.
|
|
|
|
hfLen := 7 // :method, :scheme, :path, :authority, content-type, user-agent, te
|
|
|
|
hfLen += len(authData) + len(callAuthData)
|
|
|
|
headerFields := make([]hpack.HeaderField, 0, hfLen)
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: ":method", Value: "POST"})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: ":scheme", Value: t.scheme})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: ":path", Value: callHdr.Method})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: ":authority", Value: callHdr.Host})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "user-agent", Value: t.userAgent})
|
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "te", Value: "trailers"})
|
2017-01-26 15:51:44 +00:00
|
|
|
|
|
|
|
if callHdr.SendCompress != "" {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-encoding", Value: callHdr.SendCompress})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
if dl, ok := ctx.Deadline(); ok {
|
|
|
|
// Send out timeout regardless its value. The server can detect timeout context by itself.
|
2018-01-03 19:19:49 +00:00
|
|
|
// TODO(mmukhi): Perhaps this field should be updated when actually writing out to the wire.
|
2017-01-26 15:51:44 +00:00
|
|
|
timeout := dl.Sub(time.Now())
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-timeout", Value: encodeTimeout(timeout)})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
for k, v := range authData {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
for k, v := range callAuthData {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
if b := stats.OutgoingTags(ctx); b != nil {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-tags-bin", Value: encodeBinHeader(b)})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
if b := stats.OutgoingTrace(ctx); b != nil {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-trace-bin", Value: encodeBinHeader(b)})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
if md, ok := metadata.FromOutgoingContext(ctx); ok {
|
|
|
|
for k, vv := range md {
|
2017-01-26 15:51:44 +00:00
|
|
|
// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
|
|
|
|
if isReservedHeader(k) {
|
|
|
|
continue
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
for _, v := range vv {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if md, ok := t.md.(*metadata.MD); ok {
|
2017-09-30 16:47:47 +00:00
|
|
|
for k, vv := range *md {
|
2017-01-26 15:51:44 +00:00
|
|
|
if isReservedHeader(k) {
|
|
|
|
continue
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
for _, v := range vv {
|
2018-01-03 19:19:49 +00:00
|
|
|
headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
t.mu.Lock()
|
|
|
|
if t.state == draining {
|
|
|
|
t.mu.Unlock()
|
|
|
|
t.streamsQuota.add(1)
|
|
|
|
return nil, errStreamDrain
|
|
|
|
}
|
|
|
|
if t.state != reachable {
|
|
|
|
t.mu.Unlock()
|
|
|
|
return nil, ErrConnClosing
|
|
|
|
}
|
|
|
|
s := t.newStream(ctx, callHdr)
|
|
|
|
t.activeStreams[s.id] = s
|
|
|
|
// 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 {
|
|
|
|
select {
|
|
|
|
case t.awakenKeepalive <- struct{}{}:
|
|
|
|
t.controlBuf.put(&ping{data: [8]byte{}})
|
|
|
|
// 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:
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&headerFrame{
|
|
|
|
streamID: s.id,
|
|
|
|
hf: headerFields,
|
|
|
|
endStream: false,
|
|
|
|
})
|
|
|
|
t.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
|
2017-01-26 15:51:44 +00:00
|
|
|
if t.statsHandler != nil {
|
|
|
|
outHeader := &stats.OutHeader{
|
|
|
|
Client: true,
|
|
|
|
FullMethod: callHdr.Method,
|
|
|
|
RemoteAddr: t.remoteAddr,
|
|
|
|
LocalAddr: t.localAddr,
|
|
|
|
Compression: callHdr.SendCompress,
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.statsHandler.HandleRPC(s.ctx, outHeader)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
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) {
|
|
|
|
t.mu.Lock()
|
|
|
|
if t.activeStreams == nil {
|
|
|
|
t.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
if err != nil {
|
|
|
|
// notify in-flight streams, before the deletion
|
|
|
|
s.write(recvMsg{err: err})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
delete(t.activeStreams, s.id)
|
|
|
|
if t.state == draining && len(t.activeStreams) == 0 {
|
|
|
|
// The transport is draining and s is the last live stream on t.
|
|
|
|
t.mu.Unlock()
|
|
|
|
t.Close()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
t.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
// rstStream is true in case the stream is being closed at the client-side
|
|
|
|
// and the server needs to be intimated about it by sending a RST_STREAM
|
|
|
|
// frame.
|
|
|
|
// To make sure this frame is written to the wire before the headers of the
|
|
|
|
// next stream waiting for streamsQuota, we add to streamsQuota pool only
|
|
|
|
// after having acquired the writableChan to send RST_STREAM out (look at
|
|
|
|
// the controller() routine).
|
|
|
|
var rstStream bool
|
|
|
|
var rstError http2.ErrCode
|
|
|
|
defer func() {
|
|
|
|
// In case, the client doesn't have to send RST_STREAM to server
|
|
|
|
// we can safely add back to streamsQuota pool now.
|
|
|
|
if !rstStream {
|
|
|
|
t.streamsQuota.add(1)
|
|
|
|
return
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.controlBuf.put(&resetStream{s.id, rstError})
|
|
|
|
}()
|
|
|
|
s.mu.Lock()
|
|
|
|
rstStream = s.rstStream
|
|
|
|
rstError = s.rstError
|
2017-01-26 15:51:44 +00:00
|
|
|
if s.state == streamDone {
|
|
|
|
s.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if !s.headerDone {
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
}
|
|
|
|
s.state = streamDone
|
|
|
|
s.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
if _, ok := err.(StreamError); ok {
|
|
|
|
rstStream = true
|
|
|
|
rstError = http2.ErrCodeCancel
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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.
|
2018-01-03 19:19:49 +00:00
|
|
|
func (t *http2Client) Close() error {
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Lock()
|
|
|
|
if t.state == closing {
|
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
return nil
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
t.state = closing
|
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
t.cancel()
|
|
|
|
err := t.conn.Close()
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Lock()
|
|
|
|
streams := t.activeStreams
|
|
|
|
t.activeStreams = nil
|
|
|
|
t.mu.Unlock()
|
|
|
|
// Notify all active streams.
|
|
|
|
for _, s := range streams {
|
|
|
|
s.mu.Lock()
|
|
|
|
if !s.headerDone {
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
}
|
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: ErrConnClosing})
|
|
|
|
}
|
|
|
|
if t.statsHandler != nil {
|
|
|
|
connEnd := &stats.ConnEnd{
|
|
|
|
Client: true,
|
|
|
|
}
|
|
|
|
t.statsHandler.HandleConn(t.ctx, connEnd)
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
return err
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
|
2018-01-03 19:19:49 +00:00
|
|
|
// 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.
|
2017-01-26 15:51:44 +00:00
|
|
|
func (t *http2Client) GracefulClose() error {
|
|
|
|
t.mu.Lock()
|
|
|
|
switch t.state {
|
2018-01-03 19:19:49 +00:00
|
|
|
case closing, draining:
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Unlock()
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
t.state = draining
|
|
|
|
active := len(t.activeStreams)
|
|
|
|
t.mu.Unlock()
|
|
|
|
if active == 0 {
|
|
|
|
return t.Close()
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// Write formats the data into HTTP2 data frame(s) and sends it out. The caller
|
|
|
|
// should proceed only if Write returns nil.
|
2017-09-30 16:47:47 +00:00
|
|
|
func (t *http2Client) Write(s *Stream, hdr []byte, data []byte, opts *Options) error {
|
2018-01-03 19:19:49 +00:00
|
|
|
select {
|
|
|
|
case <-s.ctx.Done():
|
|
|
|
return ContextErr(s.ctx.Err())
|
2018-01-20 17:57:11 +00:00
|
|
|
case <-s.done:
|
|
|
|
return io.EOF
|
2018-01-03 19:19:49 +00:00
|
|
|
case <-t.ctx.Done():
|
|
|
|
return ErrConnClosing
|
|
|
|
default:
|
|
|
|
}
|
|
|
|
|
|
|
|
if hdr == nil && data == nil && opts.Last {
|
|
|
|
// stream.CloseSend uses this to send an empty frame with endStream=True
|
|
|
|
t.controlBuf.put(&dataFrame{streamID: s.id, endStream: true, f: func() {}})
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
// Add data to header frame so that we can equally distribute data across frames.
|
|
|
|
emptyLen := http2MaxFrameLen - len(hdr)
|
|
|
|
if emptyLen > len(data) {
|
|
|
|
emptyLen = len(data)
|
|
|
|
}
|
|
|
|
hdr = append(hdr, data[:emptyLen]...)
|
|
|
|
data = data[emptyLen:]
|
2017-10-06 15:29:20 +00:00
|
|
|
var (
|
2018-01-03 19:19:49 +00:00
|
|
|
streamQuota int
|
|
|
|
streamQuotaVer uint32
|
|
|
|
err error
|
2017-10-06 15:29:20 +00:00
|
|
|
)
|
2018-01-03 19:19:49 +00:00
|
|
|
for idx, r := range [][]byte{hdr, data} {
|
|
|
|
for len(r) > 0 {
|
2017-01-26 15:51:44 +00:00
|
|
|
size := http2MaxFrameLen
|
2018-01-03 19:19:49 +00:00
|
|
|
if size > len(r) {
|
|
|
|
size = len(r)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
if streamQuota == 0 { // Used up all the locally cached stream quota.
|
|
|
|
// Get all the stream quota there is.
|
|
|
|
streamQuota, streamQuotaVer, err = s.sendQuotaPool.get(math.MaxInt32, s.waiters)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if size > streamQuota {
|
|
|
|
size = streamQuota
|
|
|
|
}
|
|
|
|
|
|
|
|
// Get size worth quota from transport.
|
|
|
|
tq, _, err := t.sendQuotaPool.get(size, s.waiters)
|
2017-01-26 15:51:44 +00:00
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
if tq < size {
|
|
|
|
size = tq
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
ltq, _, err := t.localSendQuota.get(size, s.waiters)
|
|
|
|
if err != nil {
|
|
|
|
return err
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
// even if ltq is smaller than size we don't adjust size since
|
|
|
|
// ltq is only a soft limit.
|
|
|
|
streamQuota -= size
|
|
|
|
p := r[:size]
|
|
|
|
var endStream bool
|
|
|
|
// See if this is the last frame to be written.
|
|
|
|
if opts.Last {
|
|
|
|
if len(r)-size == 0 { // No more data in r after this iteration.
|
|
|
|
if idx == 0 { // We're writing data header.
|
|
|
|
if len(data) == 0 { // There's no data to follow.
|
|
|
|
endStream = true
|
|
|
|
}
|
|
|
|
} else { // We're writing data.
|
|
|
|
endStream = true
|
|
|
|
}
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
success := func() {
|
|
|
|
ltq := ltq
|
|
|
|
t.controlBuf.put(&dataFrame{streamID: s.id, endStream: endStream, d: p, f: func() { t.localSendQuota.add(ltq) }})
|
|
|
|
r = r[size:]
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
failure := func() { // The stream quota version must have changed.
|
|
|
|
// Our streamQuota cache is invalidated now, so give it back.
|
|
|
|
s.sendQuotaPool.lockedAdd(streamQuota + size)
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
if !s.sendQuotaPool.compareAndExecute(streamQuotaVer, success, failure) {
|
|
|
|
// Couldn't send this chunk out.
|
|
|
|
t.sendQuotaPool.add(size)
|
|
|
|
t.localSendQuota.add(ltq)
|
|
|
|
streamQuota = 0
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
}
|
|
|
|
if streamQuota > 0 { // Add the left over quota back to stream.
|
|
|
|
s.sendQuotaPool.add(streamQuota)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
if !opts.Last {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
s.mu.Lock()
|
|
|
|
if s.state != streamDone {
|
|
|
|
s.state = streamWriteDone
|
|
|
|
}
|
|
|
|
s.mu.Unlock()
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
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
|
|
|
|
}
|
|
|
|
|
2017-09-30 16:47:47 +00:00
|
|
|
// 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) {
|
|
|
|
s.mu.Lock()
|
|
|
|
defer s.mu.Unlock()
|
|
|
|
if s.state == streamDone {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if w := s.fc.maybeAdjust(n); w > 0 {
|
2018-01-03 19:19:49 +00:00
|
|
|
// Piggyback connection's window update along.
|
2017-09-30 16:47:47 +00:00
|
|
|
if cw := t.fc.resetPendingUpdate(); cw > 0 {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{0, cw})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{s.id, w})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-01-26 15:51:44 +00:00
|
|
|
// updateWindow adjusts the inbound quota for the stream and the transport.
|
|
|
|
// Window updates will deliver to the controller for sending when
|
|
|
|
// the cumulative quota exceeds the corresponding threshold.
|
|
|
|
func (t *http2Client) updateWindow(s *Stream, n uint32) {
|
|
|
|
s.mu.Lock()
|
|
|
|
defer s.mu.Unlock()
|
|
|
|
if s.state == streamDone {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if w := s.fc.onRead(n); w > 0 {
|
2017-09-30 16:47:47 +00:00
|
|
|
if cw := t.fc.resetPendingUpdate(); cw > 0 {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{0, cw})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{s.id, w})
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-09-30 16:47:47 +00:00
|
|
|
// 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.initialWindowSize = int32(n)
|
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{0, t.fc.newLimit(n)})
|
2017-09-30 16:47:47 +00:00
|
|
|
t.controlBuf.put(&settings{
|
|
|
|
ss: []http2.Setting{
|
|
|
|
{
|
|
|
|
ID: http2.SettingInitialWindowSize,
|
|
|
|
Val: uint32(n),
|
|
|
|
},
|
|
|
|
},
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
2017-01-26 15:51:44 +00:00
|
|
|
func (t *http2Client) handleData(f *http2.DataFrame) {
|
2017-09-30 16:47:47 +00:00
|
|
|
size := f.Header().Length
|
|
|
|
var sendBDPPing bool
|
|
|
|
if t.bdpEst != nil {
|
|
|
|
sendBDPPing = t.bdpEst.add(uint32(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.
|
|
|
|
//
|
|
|
|
// Furthermore, if a bdpPing is being sent out we can piggyback
|
|
|
|
// connection's window update for the bytes we just received.
|
|
|
|
if sendBDPPing {
|
2018-01-03 19:19:49 +00:00
|
|
|
if size != 0 { // Could've been an empty data frame.
|
|
|
|
t.controlBuf.put(&windowUpdate{0, uint32(size)})
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.controlBuf.put(bdpPing)
|
|
|
|
} else {
|
|
|
|
if err := t.fc.onData(uint32(size)); err != nil {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-09-30 16:47:47 +00:00
|
|
|
return
|
|
|
|
}
|
|
|
|
if w := t.fc.onRead(uint32(size)); w > 0 {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{0, w})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
// Select the right stream to dispatch.
|
|
|
|
s, ok := t.getStream(f)
|
|
|
|
if !ok {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if size > 0 {
|
|
|
|
s.mu.Lock()
|
|
|
|
if s.state == streamDone {
|
|
|
|
s.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if err := s.fc.onData(uint32(size)); err != nil {
|
2017-09-30 16:47:47 +00:00
|
|
|
s.rstStream = true
|
|
|
|
s.rstError = http2.ErrCodeFlowControl
|
|
|
|
s.finish(status.New(codes.Internal, err.Error()))
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: io.EOF})
|
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
if f.Header().Flags.Has(http2.FlagDataPadded) {
|
|
|
|
if w := s.fc.onRead(uint32(size) - uint32(len(f.Data()))); w > 0 {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.controlBuf.put(&windowUpdate{s.id, w})
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Unlock()
|
|
|
|
// 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?
|
2017-09-30 16:47:47 +00:00
|
|
|
if len(f.Data()) > 0 {
|
|
|
|
data := make([]byte, len(f.Data()))
|
|
|
|
copy(data, f.Data())
|
|
|
|
s.write(recvMsg{data: data})
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
// 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) {
|
|
|
|
s.mu.Lock()
|
|
|
|
if s.state == streamDone {
|
|
|
|
s.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
s.finish(status.New(codes.Internal, "server closed the stream without sending trailers"))
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: io.EOF})
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
|
|
|
|
s, ok := t.getStream(f)
|
|
|
|
if !ok {
|
|
|
|
return
|
|
|
|
}
|
|
|
|
s.mu.Lock()
|
|
|
|
if s.state == streamDone {
|
|
|
|
s.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if !s.headerDone {
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
|
|
|
|
code := http2.ErrCode(f.ErrCode)
|
|
|
|
if code == http2.ErrCodeRefusedStream {
|
|
|
|
// The stream was unprocessed by the server.
|
|
|
|
s.unprocessed = true
|
|
|
|
}
|
|
|
|
statusCode, ok := http2ErrConvTab[code]
|
2017-01-26 15:51:44 +00:00
|
|
|
if !ok {
|
2017-09-30 16:47:47 +00:00
|
|
|
warningf("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error %v", f.ErrCode)
|
|
|
|
statusCode = codes.Unknown
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
s.finish(status.Newf(statusCode, "stream terminated by RST_STREAM with error code: %v", f.ErrCode))
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: io.EOF})
|
|
|
|
}
|
|
|
|
|
2018-01-03 19:19:49 +00:00
|
|
|
func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
|
2017-01-26 15:51:44 +00:00
|
|
|
if f.IsAck() {
|
|
|
|
return
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
var rs []http2.Setting
|
|
|
|
var ps []http2.Setting
|
|
|
|
isMaxConcurrentStreamsMissing := true
|
2017-01-26 15:51:44 +00:00
|
|
|
f.ForeachSetting(func(s http2.Setting) error {
|
2018-01-03 19:19:49 +00:00
|
|
|
if s.ID == http2.SettingMaxConcurrentStreams {
|
|
|
|
isMaxConcurrentStreamsMissing = false
|
|
|
|
}
|
|
|
|
if t.isRestrictive(s) {
|
|
|
|
rs = append(rs, s)
|
|
|
|
} else {
|
|
|
|
ps = append(ps, s)
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
return nil
|
|
|
|
})
|
2018-01-03 19:19:49 +00:00
|
|
|
if isFirst && isMaxConcurrentStreamsMissing {
|
|
|
|
// This means server is imposing no limits on
|
|
|
|
// maximum number of concurrent streams initiated by client.
|
|
|
|
// So we must remove our self-imposed limit.
|
|
|
|
ps = append(ps, http2.Setting{
|
|
|
|
ID: http2.SettingMaxConcurrentStreams,
|
|
|
|
Val: math.MaxUint32,
|
|
|
|
})
|
|
|
|
}
|
|
|
|
t.applySettings(rs)
|
|
|
|
t.controlBuf.put(&settingsAck{})
|
|
|
|
t.applySettings(ps)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) isRestrictive(s http2.Setting) bool {
|
|
|
|
switch s.ID {
|
|
|
|
case http2.SettingMaxConcurrentStreams:
|
|
|
|
return int(s.Val) < t.maxStreams
|
|
|
|
case http2.SettingInitialWindowSize:
|
|
|
|
// Note: we don't acquire a lock here to read streamSendQuota
|
|
|
|
// because the same goroutine updates it later.
|
|
|
|
return s.Val < t.streamSendQuota
|
|
|
|
}
|
|
|
|
return false
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) handlePing(f *http2.PingFrame) {
|
2017-09-30 16:47:47 +00:00
|
|
|
if f.IsAck() {
|
|
|
|
// Maybe it's a BDP ping.
|
|
|
|
if t.bdpEst != nil {
|
|
|
|
t.bdpEst.calculate(f.Data)
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
|
|
|
pingAck := &ping{ack: true}
|
|
|
|
copy(pingAck.data[:], f.Data[:])
|
|
|
|
t.controlBuf.put(pingAck)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
|
|
|
|
t.mu.Lock()
|
2017-09-30 16:47:47 +00:00
|
|
|
if t.state != reachable && t.state != draining {
|
|
|
|
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()
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-09-30 16:47:47 +00:00
|
|
|
return
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
// 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.
|
2017-09-30 16:47:47 +00:00
|
|
|
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 {
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Unlock()
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
default:
|
|
|
|
t.setGoAwayReason(f)
|
2017-01-26 15:51:44 +00:00
|
|
|
close(t.goAway)
|
2017-09-30 16:47:47 +00:00
|
|
|
t.state = draining
|
|
|
|
}
|
|
|
|
// 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 {
|
2018-01-03 19:19:49 +00:00
|
|
|
// The stream was unprocessed by the server.
|
|
|
|
stream.mu.Lock()
|
|
|
|
stream.unprocessed = true
|
|
|
|
stream.finish(statusGoAway)
|
|
|
|
stream.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
close(stream.goAway)
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.prevGoAwayID = id
|
|
|
|
active := len(t.activeStreams)
|
2017-01-26 15:51:44 +00:00
|
|
|
t.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
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) {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.goAwayReason = GoAwayNoReason
|
2017-09-30 16:47:47 +00:00
|
|
|
switch f.ErrCode {
|
|
|
|
case http2.ErrCodeEnhanceYourCalm:
|
|
|
|
if string(f.DebugData()) == "too_many_pings" {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.goAwayReason = GoAwayTooManyPings
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) GetGoAwayReason() GoAwayReason {
|
|
|
|
t.mu.Lock()
|
|
|
|
defer t.mu.Unlock()
|
|
|
|
return t.goAwayReason
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
|
|
|
|
id := f.Header().StreamID
|
|
|
|
incr := f.Increment
|
|
|
|
if id == 0 {
|
|
|
|
t.sendQuotaPool.add(int(incr))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if s, ok := t.getStream(f); ok {
|
|
|
|
s.sendQuotaPool.add(int(incr))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// operateHeaders takes action on the decoded headers.
|
|
|
|
func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
|
|
|
|
s, ok := t.getStream(frame)
|
|
|
|
if !ok {
|
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
s.mu.Lock()
|
|
|
|
s.bytesReceived = true
|
|
|
|
s.mu.Unlock()
|
2017-01-26 15:51:44 +00:00
|
|
|
var state decodeState
|
2017-09-30 16:47:47 +00:00
|
|
|
if err := state.decodeResponseHeader(frame); err != nil {
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Lock()
|
|
|
|
if !s.headerDone {
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
}
|
|
|
|
s.mu.Unlock()
|
2017-09-30 16:47:47 +00:00
|
|
|
s.write(recvMsg{err: err})
|
2017-01-26 15:51:44 +00:00
|
|
|
// 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),
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.statsHandler.HandleRPC(s.ctx, inHeader)
|
2017-01-26 15:51:44 +00:00
|
|
|
} else {
|
|
|
|
inTrailer := &stats.InTrailer{
|
|
|
|
Client: true,
|
|
|
|
WireLength: int(frame.Header().Length),
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.statsHandler.HandleRPC(s.ctx, inTrailer)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
|
|
|
|
s.mu.Lock()
|
|
|
|
if !s.headerDone {
|
2018-01-20 17:57:11 +00:00
|
|
|
// Headers frame is not actually a trailers-only frame.
|
|
|
|
if !endStream {
|
|
|
|
s.recvCompress = state.encoding
|
|
|
|
if len(state.mdata) > 0 {
|
|
|
|
s.header = state.mdata
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
isHeader = true
|
|
|
|
}
|
|
|
|
if !endStream || s.state == streamDone {
|
|
|
|
s.mu.Unlock()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if len(state.mdata) > 0 {
|
|
|
|
s.trailer = state.mdata
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
s.finish(state.status())
|
2017-01-26 15:51:44 +00:00
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: io.EOF})
|
|
|
|
}
|
|
|
|
|
|
|
|
func handleMalformedHTTP2(s *Stream, err error) {
|
|
|
|
s.mu.Lock()
|
|
|
|
if !s.headerDone {
|
|
|
|
close(s.headerChan)
|
|
|
|
s.headerDone = true
|
|
|
|
}
|
|
|
|
s.mu.Unlock()
|
|
|
|
s.write(recvMsg{err: err})
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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() {
|
|
|
|
// Check the validity of server preface.
|
2018-01-03 19:19:49 +00:00
|
|
|
frame, err := t.framer.fr.ReadFrame()
|
2017-01-26 15:51:44 +00:00
|
|
|
if err != nil {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
atomic.CompareAndSwapUint32(&t.activity, 0, 1)
|
2017-01-26 15:51:44 +00:00
|
|
|
sf, ok := frame.(*http2.SettingsFrame)
|
|
|
|
if !ok {
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
t.onSuccess()
|
|
|
|
t.handleSettings(sf, true)
|
2017-01-26 15:51:44 +00:00
|
|
|
|
|
|
|
// loop to keep reading incoming messages on this transport.
|
|
|
|
for {
|
2018-01-03 19:19:49 +00:00
|
|
|
frame, err := t.framer.fr.ReadFrame()
|
2017-09-30 16:47:47 +00:00
|
|
|
atomic.CompareAndSwapUint32(&t.activity, 0, 1)
|
2017-01-26 15:51:44 +00:00
|
|
|
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
|
2018-01-03 19:19:49 +00:00
|
|
|
handleMalformedHTTP2(s, streamErrorf(http2ErrConvTab[se.Code], "%v", t.framer.fr.ErrorDetail()))
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
continue
|
|
|
|
} else {
|
|
|
|
// Transport error.
|
2018-01-03 19:19:49 +00:00
|
|
|
t.Close()
|
2017-01-26 15:51:44 +00:00
|
|
|
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:
|
2018-01-03 19:19:49 +00:00
|
|
|
t.handleSettings(frame, false)
|
2017-01-26 15:51:44 +00:00
|
|
|
case *http2.PingFrame:
|
|
|
|
t.handlePing(frame)
|
|
|
|
case *http2.GoAwayFrame:
|
|
|
|
t.handleGoAway(frame)
|
|
|
|
case *http2.WindowUpdateFrame:
|
|
|
|
t.handleWindowUpdate(frame)
|
|
|
|
default:
|
2017-09-30 16:47:47 +00:00
|
|
|
errorf("transport: http2Client.reader got unhandled frame type %v.", frame)
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) applySettings(ss []http2.Setting) {
|
|
|
|
for _, s := range ss {
|
|
|
|
switch s.ID {
|
|
|
|
case http2.SettingMaxConcurrentStreams:
|
|
|
|
// TODO(zhaoq): This is a hack to avoid significant refactoring of the
|
|
|
|
// code to deal with the unrealistic int32 overflow. Probably will try
|
|
|
|
// to find a better way to handle this later.
|
|
|
|
if s.Val > math.MaxInt32 {
|
|
|
|
s.Val = math.MaxInt32
|
|
|
|
}
|
|
|
|
ms := t.maxStreams
|
|
|
|
t.maxStreams = int(s.Val)
|
2017-09-30 16:47:47 +00:00
|
|
|
t.streamsQuota.add(int(s.Val) - ms)
|
2017-01-26 15:51:44 +00:00
|
|
|
case http2.SettingInitialWindowSize:
|
|
|
|
t.mu.Lock()
|
|
|
|
for _, stream := range t.activeStreams {
|
|
|
|
// Adjust the sending quota for each stream.
|
2018-01-03 19:19:49 +00:00
|
|
|
stream.sendQuotaPool.addAndUpdate(int(s.Val) - int(t.streamSendQuota))
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
t.streamSendQuota = s.Val
|
|
|
|
t.mu.Unlock()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-01-03 19:19:49 +00:00
|
|
|
// TODO(mmukhi): A lot of this code(and code in other places in the tranpsort layer)
|
|
|
|
// is duplicated between the client and the server.
|
|
|
|
// The transport layer needs to be refactored to take care of this.
|
|
|
|
func (t *http2Client) itemHandler(i item) (err error) {
|
|
|
|
defer func() {
|
|
|
|
if err != nil {
|
|
|
|
errorf(" error in itemHandler: %v", err)
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
switch i := i.(type) {
|
|
|
|
case *dataFrame:
|
|
|
|
if err := t.framer.fr.WriteData(i.streamID, i.endStream, i.d); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
i.f()
|
|
|
|
return nil
|
|
|
|
case *headerFrame:
|
|
|
|
t.hBuf.Reset()
|
|
|
|
for _, f := range i.hf {
|
|
|
|
t.hEnc.WriteField(f)
|
|
|
|
}
|
|
|
|
endHeaders := false
|
|
|
|
first := true
|
|
|
|
for !endHeaders {
|
|
|
|
size := t.hBuf.Len()
|
|
|
|
if size > http2MaxFrameLen {
|
|
|
|
size = http2MaxFrameLen
|
|
|
|
} else {
|
|
|
|
endHeaders = true
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
if first {
|
|
|
|
first = false
|
|
|
|
err = t.framer.fr.WriteHeaders(http2.HeadersFrameParam{
|
|
|
|
StreamID: i.streamID,
|
|
|
|
BlockFragment: t.hBuf.Next(size),
|
|
|
|
EndStream: i.endStream,
|
|
|
|
EndHeaders: endHeaders,
|
|
|
|
})
|
|
|
|
} else {
|
|
|
|
err = t.framer.fr.WriteContinuation(
|
|
|
|
i.streamID,
|
|
|
|
endHeaders,
|
|
|
|
t.hBuf.Next(size),
|
|
|
|
)
|
|
|
|
}
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
case *windowUpdate:
|
|
|
|
return t.framer.fr.WriteWindowUpdate(i.streamID, i.increment)
|
|
|
|
case *settings:
|
|
|
|
return t.framer.fr.WriteSettings(i.ss...)
|
|
|
|
case *settingsAck:
|
|
|
|
return t.framer.fr.WriteSettingsAck()
|
|
|
|
case *resetStream:
|
|
|
|
// If the server needs to be to intimated about stream closing,
|
|
|
|
// then we need to make sure the RST_STREAM frame is written to
|
|
|
|
// the wire before the headers of the next stream waiting on
|
|
|
|
// streamQuota. We ensure this by adding to the streamsQuota pool
|
|
|
|
// only after having acquired the writableChan to send RST_STREAM.
|
|
|
|
err := t.framer.fr.WriteRSTStream(i.streamID, i.code)
|
|
|
|
t.streamsQuota.add(1)
|
|
|
|
return err
|
|
|
|
case *flushIO:
|
|
|
|
return t.framer.writer.Flush()
|
|
|
|
case *ping:
|
|
|
|
if !i.ack {
|
|
|
|
t.bdpEst.timesnap(i.data)
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
return t.framer.fr.WritePing(i.ack, i.data)
|
|
|
|
default:
|
|
|
|
errorf("transport: http2Client.controller got unexpected item type %v", i)
|
|
|
|
return fmt.Errorf("transport: http2Client.controller got unexpected item type %v", i)
|
2017-09-30 16:47:47 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// 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)
|
2017-01-26 15:51:44 +00:00
|
|
|
for {
|
|
|
|
select {
|
2017-09-30 16:47:47 +00:00
|
|
|
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.
|
2018-01-03 19:19:49 +00:00
|
|
|
case <-t.ctx.Done():
|
2017-09-30 16:47:47 +00:00
|
|
|
return
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
t.mu.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)
|
2017-01-26 15:51:44 +00:00
|
|
|
select {
|
2017-09-30 16:47:47 +00:00
|
|
|
case <-timer.C:
|
|
|
|
if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
|
|
|
|
timer.Reset(t.kp.Time)
|
|
|
|
continue
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
2017-09-30 16:47:47 +00:00
|
|
|
t.Close()
|
|
|
|
return
|
2018-01-03 19:19:49 +00:00
|
|
|
case <-t.ctx.Done():
|
2017-09-30 16:47:47 +00:00
|
|
|
if !timer.Stop() {
|
|
|
|
<-timer.C
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
2018-01-03 19:19:49 +00:00
|
|
|
case <-t.ctx.Done():
|
2017-09-30 16:47:47 +00:00
|
|
|
if !timer.Stop() {
|
|
|
|
<-timer.C
|
|
|
|
}
|
2017-01-26 15:51:44 +00:00
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) Error() <-chan struct{} {
|
2018-01-03 19:19:49 +00:00
|
|
|
return t.ctx.Done()
|
2017-01-26 15:51:44 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (t *http2Client) GoAway() <-chan struct{} {
|
|
|
|
return t.goAway
|
|
|
|
}
|