452 lines
12 KiB
Go
452 lines
12 KiB
Go
/*
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*
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* Copyright 2014, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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package transport
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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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/grpclog"
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"google.golang.org/grpc/metadata"
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)
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const (
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// The primary user agent
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primaryUA = "grpc-go/0.11"
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// http2MaxFrameLen specifies the max length of a HTTP2 frame.
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http2MaxFrameLen = 16384 // 16KB frame
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// http://http2.github.io/http2-spec/#SettingValues
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http2InitHeaderTableSize = 4096
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// http2IOBufSize specifies the buffer size for sending frames.
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http2IOBufSize = 32 * 1024
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)
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var (
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clientPreface = []byte(http2.ClientPreface)
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http2RSTErrConvTab = map[http2.ErrCode]codes.Code{
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http2.ErrCodeNo: codes.Internal,
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http2.ErrCodeProtocol: codes.Internal,
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http2.ErrCodeInternal: codes.Internal,
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http2.ErrCodeFlowControl: codes.ResourceExhausted,
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http2.ErrCodeSettingsTimeout: codes.Internal,
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http2.ErrCodeFrameSize: codes.Internal,
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http2.ErrCodeRefusedStream: codes.Unavailable,
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http2.ErrCodeCancel: codes.Canceled,
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http2.ErrCodeCompression: codes.Internal,
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http2.ErrCodeConnect: codes.Internal,
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http2.ErrCodeEnhanceYourCalm: codes.ResourceExhausted,
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http2.ErrCodeInadequateSecurity: codes.PermissionDenied,
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}
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statusCodeConvTab = map[codes.Code]http2.ErrCode{
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codes.Internal: http2.ErrCodeInternal,
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codes.Canceled: http2.ErrCodeCancel,
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codes.Unavailable: http2.ErrCodeRefusedStream,
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codes.ResourceExhausted: http2.ErrCodeEnhanceYourCalm,
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codes.PermissionDenied: http2.ErrCodeInadequateSecurity,
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}
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)
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// Records the states during HPACK decoding. Must be reset once the
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// decoding of the entire headers are finished.
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type decodeState struct {
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// statusCode caches the stream status received from the trailer
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// the server sent. Client side only.
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statusCode codes.Code
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statusDesc string
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// Server side only fields.
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timeoutSet bool
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timeout time.Duration
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method string
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// key-value metadata map from the peer.
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mdata map[string][]string
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}
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// An hpackDecoder decodes HTTP2 headers which may span multiple frames.
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type hpackDecoder struct {
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h *hpack.Decoder
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state decodeState
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err error // The err when decoding
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}
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// A headerFrame is either a http2.HeaderFrame or http2.ContinuationFrame.
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type headerFrame interface {
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Header() http2.FrameHeader
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HeaderBlockFragment() []byte
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HeadersEnded() bool
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}
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// isReservedHeader checks whether hdr belongs to HTTP2 headers
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// reserved by gRPC protocol. Any other headers are classified as the
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// user-specified metadata.
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func isReservedHeader(hdr string) bool {
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if hdr[0] == ':' {
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return true
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}
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switch hdr {
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case "content-type",
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"grpc-message-type",
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"grpc-encoding",
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"grpc-message",
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"grpc-status",
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"grpc-timeout",
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"te":
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return true
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default:
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return false
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}
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}
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func newHPACKDecoder() *hpackDecoder {
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d := &hpackDecoder{}
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d.h = hpack.NewDecoder(http2InitHeaderTableSize, func(f hpack.HeaderField) {
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switch f.Name {
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case "content-type":
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if !strings.Contains(f.Value, "application/grpc") {
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d.err = StreamErrorf(codes.FailedPrecondition, "transport: received the unexpected header")
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return
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}
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case "grpc-status":
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code, err := strconv.Atoi(f.Value)
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if err != nil {
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d.err = StreamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err)
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return
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}
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d.state.statusCode = codes.Code(code)
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case "grpc-message":
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d.state.statusDesc = f.Value
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case "grpc-timeout":
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d.state.timeoutSet = true
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var err error
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d.state.timeout, err = timeoutDecode(f.Value)
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if err != nil {
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d.err = StreamErrorf(codes.Internal, "transport: malformed time-out: %v", err)
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return
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}
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case ":path":
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d.state.method = f.Value
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default:
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if !isReservedHeader(f.Name) {
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if f.Name == "user-agent" {
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i := strings.LastIndex(f.Value, " ")
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if i == -1 {
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// There is no application user agent string being set.
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return
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}
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// Extract the application user agent string.
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f.Value = f.Value[:i]
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}
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if d.state.mdata == nil {
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d.state.mdata = make(map[string][]string)
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}
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k, v, err := metadata.DecodeKeyValue(f.Name, f.Value)
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if err != nil {
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grpclog.Printf("Failed to decode (%q, %q): %v", f.Name, f.Value, err)
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return
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}
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d.state.mdata[k] = append(d.state.mdata[k], v)
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}
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}
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})
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return d
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}
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func (d *hpackDecoder) decodeClientHTTP2Headers(frame headerFrame) (endHeaders bool, err error) {
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d.err = nil
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_, err = d.h.Write(frame.HeaderBlockFragment())
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if err != nil {
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err = StreamErrorf(codes.Internal, "transport: HPACK header decode error: %v", err)
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}
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if frame.HeadersEnded() {
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if closeErr := d.h.Close(); closeErr != nil && err == nil {
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err = StreamErrorf(codes.Internal, "transport: HPACK decoder close error: %v", closeErr)
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}
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endHeaders = true
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}
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if err == nil && d.err != nil {
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err = d.err
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}
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return
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}
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func (d *hpackDecoder) decodeServerHTTP2Headers(frame headerFrame) (endHeaders bool, err error) {
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d.err = nil
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_, err = d.h.Write(frame.HeaderBlockFragment())
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if err != nil {
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err = StreamErrorf(codes.Internal, "transport: HPACK header decode error: %v", err)
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}
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if frame.HeadersEnded() {
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if closeErr := d.h.Close(); closeErr != nil && err == nil {
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err = StreamErrorf(codes.Internal, "transport: HPACK decoder close error: %v", closeErr)
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}
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endHeaders = true
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}
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if err == nil && d.err != nil {
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err = d.err
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}
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return
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}
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type timeoutUnit uint8
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const (
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hour timeoutUnit = 'H'
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minute timeoutUnit = 'M'
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second timeoutUnit = 'S'
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millisecond timeoutUnit = 'm'
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microsecond timeoutUnit = 'u'
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nanosecond timeoutUnit = 'n'
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)
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func timeoutUnitToDuration(u timeoutUnit) (d time.Duration, ok bool) {
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switch u {
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case hour:
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return time.Hour, true
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case minute:
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return time.Minute, true
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case second:
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return time.Second, true
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case millisecond:
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return time.Millisecond, true
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case microsecond:
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return time.Microsecond, true
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case nanosecond:
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return time.Nanosecond, true
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default:
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}
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return
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}
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const maxTimeoutValue int64 = 100000000 - 1
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// div does integer division and round-up the result. Note that this is
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// equivalent to (d+r-1)/r but has less chance to overflow.
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func div(d, r time.Duration) int64 {
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if m := d % r; m > 0 {
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return int64(d/r + 1)
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}
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return int64(d / r)
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}
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// TODO(zhaoq): It is the simplistic and not bandwidth efficient. Improve it.
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func timeoutEncode(t time.Duration) string {
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if d := div(t, time.Nanosecond); d <= maxTimeoutValue {
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return strconv.FormatInt(d, 10) + "n"
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}
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if d := div(t, time.Microsecond); d <= maxTimeoutValue {
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return strconv.FormatInt(d, 10) + "u"
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}
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if d := div(t, time.Millisecond); d <= maxTimeoutValue {
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return strconv.FormatInt(d, 10) + "m"
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}
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if d := div(t, time.Second); d <= maxTimeoutValue {
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return strconv.FormatInt(d, 10) + "S"
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}
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if d := div(t, time.Minute); d <= maxTimeoutValue {
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return strconv.FormatInt(d, 10) + "M"
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}
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// Note that maxTimeoutValue * time.Hour > MaxInt64.
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return strconv.FormatInt(div(t, time.Hour), 10) + "H"
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}
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func timeoutDecode(s string) (time.Duration, error) {
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size := len(s)
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if size < 2 {
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return 0, fmt.Errorf("transport: timeout string is too short: %q", s)
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}
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unit := timeoutUnit(s[size-1])
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d, ok := timeoutUnitToDuration(unit)
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if !ok {
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return 0, fmt.Errorf("transport: timeout unit is not recognized: %q", s)
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}
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t, err := strconv.ParseInt(s[:size-1], 10, 64)
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if err != nil {
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return 0, err
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}
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return d * time.Duration(t), nil
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}
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type framer struct {
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numWriters int32
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reader io.Reader
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writer *bufio.Writer
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fr *http2.Framer
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}
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func newFramer(conn net.Conn) *framer {
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f := &framer{
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reader: conn,
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writer: bufio.NewWriterSize(conn, http2IOBufSize),
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}
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f.fr = http2.NewFramer(f.writer, f.reader)
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return f
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}
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func (f *framer) adjustNumWriters(i int32) int32 {
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return atomic.AddInt32(&f.numWriters, i)
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}
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// The following writeXXX functions can only be called when the caller gets
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// unblocked from writableChan channel (i.e., owns the privilege to write).
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func (f *framer) writeContinuation(forceFlush bool, streamID uint32, endHeaders bool, headerBlockFragment []byte) error {
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if err := f.fr.WriteContinuation(streamID, endHeaders, headerBlockFragment); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeData(forceFlush bool, streamID uint32, endStream bool, data []byte) error {
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if err := f.fr.WriteData(streamID, endStream, data); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeGoAway(forceFlush bool, maxStreamID uint32, code http2.ErrCode, debugData []byte) error {
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if err := f.fr.WriteGoAway(maxStreamID, code, debugData); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeHeaders(forceFlush bool, p http2.HeadersFrameParam) error {
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if err := f.fr.WriteHeaders(p); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writePing(forceFlush, ack bool, data [8]byte) error {
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if err := f.fr.WritePing(ack, data); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writePriority(forceFlush bool, streamID uint32, p http2.PriorityParam) error {
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if err := f.fr.WritePriority(streamID, p); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writePushPromise(forceFlush bool, p http2.PushPromiseParam) error {
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if err := f.fr.WritePushPromise(p); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeRSTStream(forceFlush bool, streamID uint32, code http2.ErrCode) error {
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if err := f.fr.WriteRSTStream(streamID, code); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeSettings(forceFlush bool, settings ...http2.Setting) error {
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if err := f.fr.WriteSettings(settings...); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeSettingsAck(forceFlush bool) error {
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if err := f.fr.WriteSettingsAck(); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) writeWindowUpdate(forceFlush bool, streamID, incr uint32) error {
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if err := f.fr.WriteWindowUpdate(streamID, incr); err != nil {
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return err
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}
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if forceFlush {
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return f.writer.Flush()
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}
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return nil
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}
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func (f *framer) flushWrite() error {
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return f.writer.Flush()
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}
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func (f *framer) readFrame() (http2.Frame, error) {
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return f.fr.ReadFrame()
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}
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