mirror of
https://github.com/genuinetools/reg.git
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579 lines
16 KiB
Go
579 lines
16 KiB
Go
![]() |
/*
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*
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* Copyright 2014 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package transport
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import (
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"bufio"
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"bytes"
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"encoding/base64"
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"fmt"
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"net"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/golang/protobuf/proto"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/hpack"
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spb "google.golang.org/genproto/googleapis/rpc/status"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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const (
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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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defaultWriteBufSize = 32 * 1024
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defaultReadBufSize = 32 * 1024
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// baseContentType is the base content-type for gRPC. This is a valid
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// content-type on it's own, but can also include a content-subtype such as
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// "proto" as a suffix after "+" or ";". See
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// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests
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// for more details.
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baseContentType = "application/grpc"
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)
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var (
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clientPreface = []byte(http2.ClientPreface)
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http2ErrConvTab = 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.ErrCodeStreamClosed: 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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http2.ErrCodeHTTP11Required: codes.Internal,
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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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httpStatusConvTab = map[int]codes.Code{
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// 400 Bad Request - INTERNAL.
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http.StatusBadRequest: codes.Internal,
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// 401 Unauthorized - UNAUTHENTICATED.
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http.StatusUnauthorized: codes.Unauthenticated,
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// 403 Forbidden - PERMISSION_DENIED.
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http.StatusForbidden: codes.PermissionDenied,
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// 404 Not Found - UNIMPLEMENTED.
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http.StatusNotFound: codes.Unimplemented,
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// 429 Too Many Requests - UNAVAILABLE.
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http.StatusTooManyRequests: codes.Unavailable,
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// 502 Bad Gateway - UNAVAILABLE.
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http.StatusBadGateway: codes.Unavailable,
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// 503 Service Unavailable - UNAVAILABLE.
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http.StatusServiceUnavailable: codes.Unavailable,
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// 504 Gateway timeout - UNAVAILABLE.
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http.StatusGatewayTimeout: codes.Unavailable,
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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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encoding string
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// statusGen caches the stream status received from the trailer the server
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// sent. Client side only. Do not access directly. After all trailers are
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// parsed, use the status method to retrieve the status.
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statusGen *status.Status
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// rawStatusCode and rawStatusMsg are set from the raw trailer fields and are not
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// intended for direct access outside of parsing.
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rawStatusCode *int
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rawStatusMsg string
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httpStatus *int
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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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statsTags []byte
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statsTrace []byte
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contentSubtype string
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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 != "" && 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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"user-agent",
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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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"grpc-status-details-bin",
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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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// isWhitelistedHeader checks whether hdr should be propagated
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// into metadata visible to users.
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func isWhitelistedHeader(hdr string) bool {
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switch hdr {
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case ":authority", "user-agent":
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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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// contentSubtype returns the content-subtype for the given content-type. The
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// given content-type must be a valid content-type that starts with
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// "application/grpc". A content-subtype will follow "application/grpc" after a
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// "+" or ";". See
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// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
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// more details.
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//
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// If contentType is not a valid content-type for gRPC, the boolean
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// will be false, otherwise true. If content-type == "application/grpc",
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// "application/grpc+", or "application/grpc;", the boolean will be true,
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// but no content-subtype will be returned.
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//
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// contentType is assumed to be lowercase already.
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func contentSubtype(contentType string) (string, bool) {
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if contentType == baseContentType {
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return "", true
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}
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if !strings.HasPrefix(contentType, baseContentType) {
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return "", false
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}
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// guaranteed since != baseContentType and has baseContentType prefix
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switch contentType[len(baseContentType)] {
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case '+', ';':
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// this will return true for "application/grpc+" or "application/grpc;"
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// which the previous validContentType function tested to be valid, so we
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// just say that no content-subtype is specified in this case
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return contentType[len(baseContentType)+1:], true
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default:
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return "", false
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}
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}
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// contentSubtype is assumed to be lowercase
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func contentType(contentSubtype string) string {
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if contentSubtype == "" {
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return baseContentType
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}
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return baseContentType + "+" + contentSubtype
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}
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func (d *decodeState) status() *status.Status {
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if d.statusGen == nil {
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// No status-details were provided; generate status using code/msg.
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d.statusGen = status.New(codes.Code(int32(*(d.rawStatusCode))), d.rawStatusMsg)
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}
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return d.statusGen
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}
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const binHdrSuffix = "-bin"
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func encodeBinHeader(v []byte) string {
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return base64.RawStdEncoding.EncodeToString(v)
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}
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func decodeBinHeader(v string) ([]byte, error) {
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if len(v)%4 == 0 {
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// Input was padded, or padding was not necessary.
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return base64.StdEncoding.DecodeString(v)
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}
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return base64.RawStdEncoding.DecodeString(v)
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}
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func encodeMetadataHeader(k, v string) string {
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if strings.HasSuffix(k, binHdrSuffix) {
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return encodeBinHeader(([]byte)(v))
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}
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return v
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}
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func decodeMetadataHeader(k, v string) (string, error) {
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if strings.HasSuffix(k, binHdrSuffix) {
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b, err := decodeBinHeader(v)
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return string(b), err
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}
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return v, nil
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}
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func (d *decodeState) decodeResponseHeader(frame *http2.MetaHeadersFrame) error {
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for _, hf := range frame.Fields {
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if err := d.processHeaderField(hf); err != nil {
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return err
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}
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}
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// If grpc status exists, no need to check further.
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if d.rawStatusCode != nil || d.statusGen != nil {
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return nil
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}
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// If grpc status doesn't exist and http status doesn't exist,
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// then it's a malformed header.
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if d.httpStatus == nil {
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return streamErrorf(codes.Internal, "malformed header: doesn't contain status(gRPC or HTTP)")
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}
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if *(d.httpStatus) != http.StatusOK {
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code, ok := httpStatusConvTab[*(d.httpStatus)]
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if !ok {
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code = codes.Unknown
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}
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return streamErrorf(code, http.StatusText(*(d.httpStatus)))
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}
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// gRPC status doesn't exist and http status is OK.
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// Set rawStatusCode to be unknown and return nil error.
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// So that, if the stream has ended this Unknown status
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// will be propagated to the user.
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// Otherwise, it will be ignored. In which case, status from
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// a later trailer, that has StreamEnded flag set, is propagated.
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code := int(codes.Unknown)
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d.rawStatusCode = &code
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return nil
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}
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func (d *decodeState) addMetadata(k, v string) {
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if d.mdata == nil {
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d.mdata = make(map[string][]string)
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}
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d.mdata[k] = append(d.mdata[k], v)
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}
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func (d *decodeState) processHeaderField(f hpack.HeaderField) error {
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switch f.Name {
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case "content-type":
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contentSubtype, validContentType := contentSubtype(f.Value)
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if !validContentType {
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return streamErrorf(codes.Internal, "transport: received the unexpected content-type %q", f.Value)
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}
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d.contentSubtype = contentSubtype
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// TODO: do we want to propagate the whole content-type in the metadata,
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// or come up with a way to just propagate the content-subtype if it was set?
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// ie {"content-type": "application/grpc+proto"} or {"content-subtype": "proto"}
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// in the metadata?
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d.addMetadata(f.Name, f.Value)
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case "grpc-encoding":
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d.encoding = f.Value
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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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return streamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err)
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}
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d.rawStatusCode = &code
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case "grpc-message":
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d.rawStatusMsg = decodeGrpcMessage(f.Value)
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case "grpc-status-details-bin":
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v, err := decodeBinHeader(f.Value)
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if err != nil {
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return streamErrorf(codes.Internal, "transport: malformed grpc-status-details-bin: %v", err)
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}
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s := &spb.Status{}
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if err := proto.Unmarshal(v, s); err != nil {
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return streamErrorf(codes.Internal, "transport: malformed grpc-status-details-bin: %v", err)
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}
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d.statusGen = status.FromProto(s)
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case "grpc-timeout":
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d.timeoutSet = true
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var err error
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if d.timeout, err = decodeTimeout(f.Value); err != nil {
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return streamErrorf(codes.Internal, "transport: malformed time-out: %v", err)
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}
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case ":path":
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d.method = f.Value
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case ":status":
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code, err := strconv.Atoi(f.Value)
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if err != nil {
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return streamErrorf(codes.Internal, "transport: malformed http-status: %v", err)
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}
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d.httpStatus = &code
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case "grpc-tags-bin":
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v, err := decodeBinHeader(f.Value)
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|
if err != nil {
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|
return streamErrorf(codes.Internal, "transport: malformed grpc-tags-bin: %v", err)
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}
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d.statsTags = v
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d.addMetadata(f.Name, string(v))
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|
case "grpc-trace-bin":
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||
|
v, err := decodeBinHeader(f.Value)
|
||
|
if err != nil {
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||
|
return streamErrorf(codes.Internal, "transport: malformed grpc-trace-bin: %v", err)
|
||
|
}
|
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|
d.statsTrace = v
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d.addMetadata(f.Name, string(v))
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||
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default:
|
||
|
if isReservedHeader(f.Name) && !isWhitelistedHeader(f.Name) {
|
||
|
break
|
||
|
}
|
||
|
v, err := decodeMetadataHeader(f.Name, f.Value)
|
||
|
if err != nil {
|
||
|
errorf("Failed to decode metadata header (%q, %q): %v", f.Name, f.Value, err)
|
||
|
return nil
|
||
|
}
|
||
|
d.addMetadata(f.Name, v)
|
||
|
}
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
type timeoutUnit uint8
|
||
|
|
||
|
const (
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||
|
hour timeoutUnit = 'H'
|
||
|
minute timeoutUnit = 'M'
|
||
|
second timeoutUnit = 'S'
|
||
|
millisecond timeoutUnit = 'm'
|
||
|
microsecond timeoutUnit = 'u'
|
||
|
nanosecond timeoutUnit = 'n'
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||
|
)
|
||
|
|
||
|
func timeoutUnitToDuration(u timeoutUnit) (d time.Duration, ok bool) {
|
||
|
switch u {
|
||
|
case hour:
|
||
|
return time.Hour, true
|
||
|
case minute:
|
||
|
return time.Minute, true
|
||
|
case second:
|
||
|
return time.Second, true
|
||
|
case millisecond:
|
||
|
return time.Millisecond, true
|
||
|
case microsecond:
|
||
|
return time.Microsecond, true
|
||
|
case nanosecond:
|
||
|
return time.Nanosecond, true
|
||
|
default:
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
const maxTimeoutValue int64 = 100000000 - 1
|
||
|
|
||
|
// div does integer division and round-up the result. Note that this is
|
||
|
// equivalent to (d+r-1)/r but has less chance to overflow.
|
||
|
func div(d, r time.Duration) int64 {
|
||
|
if m := d % r; m > 0 {
|
||
|
return int64(d/r + 1)
|
||
|
}
|
||
|
return int64(d / r)
|
||
|
}
|
||
|
|
||
|
// TODO(zhaoq): It is the simplistic and not bandwidth efficient. Improve it.
|
||
|
func encodeTimeout(t time.Duration) string {
|
||
|
if t <= 0 {
|
||
|
return "0n"
|
||
|
}
|
||
|
if d := div(t, time.Nanosecond); d <= maxTimeoutValue {
|
||
|
return strconv.FormatInt(d, 10) + "n"
|
||
|
}
|
||
|
if d := div(t, time.Microsecond); d <= maxTimeoutValue {
|
||
|
return strconv.FormatInt(d, 10) + "u"
|
||
|
}
|
||
|
if d := div(t, time.Millisecond); d <= maxTimeoutValue {
|
||
|
return strconv.FormatInt(d, 10) + "m"
|
||
|
}
|
||
|
if d := div(t, time.Second); d <= maxTimeoutValue {
|
||
|
return strconv.FormatInt(d, 10) + "S"
|
||
|
}
|
||
|
if d := div(t, time.Minute); d <= maxTimeoutValue {
|
||
|
return strconv.FormatInt(d, 10) + "M"
|
||
|
}
|
||
|
// Note that maxTimeoutValue * time.Hour > MaxInt64.
|
||
|
return strconv.FormatInt(div(t, time.Hour), 10) + "H"
|
||
|
}
|
||
|
|
||
|
func decodeTimeout(s string) (time.Duration, error) {
|
||
|
size := len(s)
|
||
|
if size < 2 {
|
||
|
return 0, fmt.Errorf("transport: timeout string is too short: %q", s)
|
||
|
}
|
||
|
unit := timeoutUnit(s[size-1])
|
||
|
d, ok := timeoutUnitToDuration(unit)
|
||
|
if !ok {
|
||
|
return 0, fmt.Errorf("transport: timeout unit is not recognized: %q", s)
|
||
|
}
|
||
|
t, err := strconv.ParseInt(s[:size-1], 10, 64)
|
||
|
if err != nil {
|
||
|
return 0, err
|
||
|
}
|
||
|
return d * time.Duration(t), nil
|
||
|
}
|
||
|
|
||
|
const (
|
||
|
spaceByte = ' '
|
||
|
tildaByte = '~'
|
||
|
percentByte = '%'
|
||
|
)
|
||
|
|
||
|
// encodeGrpcMessage is used to encode status code in header field
|
||
|
// "grpc-message".
|
||
|
// It checks to see if each individual byte in msg is an
|
||
|
// allowable byte, and then either percent encoding or passing it through.
|
||
|
// When percent encoding, the byte is converted into hexadecimal notation
|
||
|
// with a '%' prepended.
|
||
|
func encodeGrpcMessage(msg string) string {
|
||
|
if msg == "" {
|
||
|
return ""
|
||
|
}
|
||
|
lenMsg := len(msg)
|
||
|
for i := 0; i < lenMsg; i++ {
|
||
|
c := msg[i]
|
||
|
if !(c >= spaceByte && c < tildaByte && c != percentByte) {
|
||
|
return encodeGrpcMessageUnchecked(msg)
|
||
|
}
|
||
|
}
|
||
|
return msg
|
||
|
}
|
||
|
|
||
|
func encodeGrpcMessageUnchecked(msg string) string {
|
||
|
var buf bytes.Buffer
|
||
|
lenMsg := len(msg)
|
||
|
for i := 0; i < lenMsg; i++ {
|
||
|
c := msg[i]
|
||
|
if c >= spaceByte && c < tildaByte && c != percentByte {
|
||
|
buf.WriteByte(c)
|
||
|
} else {
|
||
|
buf.WriteString(fmt.Sprintf("%%%02X", c))
|
||
|
}
|
||
|
}
|
||
|
return buf.String()
|
||
|
}
|
||
|
|
||
|
// decodeGrpcMessage decodes the msg encoded by encodeGrpcMessage.
|
||
|
func decodeGrpcMessage(msg string) string {
|
||
|
if msg == "" {
|
||
|
return ""
|
||
|
}
|
||
|
lenMsg := len(msg)
|
||
|
for i := 0; i < lenMsg; i++ {
|
||
|
if msg[i] == percentByte && i+2 < lenMsg {
|
||
|
return decodeGrpcMessageUnchecked(msg)
|
||
|
}
|
||
|
}
|
||
|
return msg
|
||
|
}
|
||
|
|
||
|
func decodeGrpcMessageUnchecked(msg string) string {
|
||
|
var buf bytes.Buffer
|
||
|
lenMsg := len(msg)
|
||
|
for i := 0; i < lenMsg; i++ {
|
||
|
c := msg[i]
|
||
|
if c == percentByte && i+2 < lenMsg {
|
||
|
parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
|
||
|
if err != nil {
|
||
|
buf.WriteByte(c)
|
||
|
} else {
|
||
|
buf.WriteByte(byte(parsed))
|
||
|
i += 2
|
||
|
}
|
||
|
} else {
|
||
|
buf.WriteByte(c)
|
||
|
}
|
||
|
}
|
||
|
return buf.String()
|
||
|
}
|
||
|
|
||
|
type bufWriter struct {
|
||
|
buf []byte
|
||
|
offset int
|
||
|
batchSize int
|
||
|
conn net.Conn
|
||
|
err error
|
||
|
|
||
|
onFlush func()
|
||
|
}
|
||
|
|
||
|
func newBufWriter(conn net.Conn, batchSize int) *bufWriter {
|
||
|
return &bufWriter{
|
||
|
buf: make([]byte, batchSize*2),
|
||
|
batchSize: batchSize,
|
||
|
conn: conn,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (w *bufWriter) Write(b []byte) (n int, err error) {
|
||
|
if w.err != nil {
|
||
|
return 0, w.err
|
||
|
}
|
||
|
for len(b) > 0 {
|
||
|
nn := copy(w.buf[w.offset:], b)
|
||
|
b = b[nn:]
|
||
|
w.offset += nn
|
||
|
n += nn
|
||
|
if w.offset >= w.batchSize {
|
||
|
err = w.Flush()
|
||
|
}
|
||
|
}
|
||
|
return n, err
|
||
|
}
|
||
|
|
||
|
func (w *bufWriter) Flush() error {
|
||
|
if w.err != nil {
|
||
|
return w.err
|
||
|
}
|
||
|
if w.offset == 0 {
|
||
|
return nil
|
||
|
}
|
||
|
if w.onFlush != nil {
|
||
|
w.onFlush()
|
||
|
}
|
||
|
_, w.err = w.conn.Write(w.buf[:w.offset])
|
||
|
w.offset = 0
|
||
|
return w.err
|
||
|
}
|
||
|
|
||
|
type framer struct {
|
||
|
writer *bufWriter
|
||
|
fr *http2.Framer
|
||
|
}
|
||
|
|
||
|
func newFramer(conn net.Conn, writeBufferSize, readBufferSize int) *framer {
|
||
|
r := bufio.NewReaderSize(conn, readBufferSize)
|
||
|
w := newBufWriter(conn, writeBufferSize)
|
||
|
f := &framer{
|
||
|
writer: w,
|
||
|
fr: http2.NewFramer(w, r),
|
||
|
}
|
||
|
// Opt-in to Frame reuse API on framer to reduce garbage.
|
||
|
// Frames aren't safe to read from after a subsequent call to ReadFrame.
|
||
|
f.fr.SetReuseFrames()
|
||
|
f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
|
||
|
return f
|
||
|
}
|