2018-05-01 23:45:06 +00:00
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/*
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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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"encoding/base64"
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2023-12-11 11:58:19 +00:00
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"errors"
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2018-05-01 23:45:06 +00:00
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"fmt"
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2019-04-17 17:15:55 +00:00
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"io"
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"math"
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2018-05-01 23:45:06 +00:00
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"net"
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"net/http"
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2022-01-25 13:15:24 +00:00
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"net/url"
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2018-05-01 23:45:06 +00:00
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"strconv"
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"strings"
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2023-12-11 11:58:19 +00:00
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"sync"
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2018-05-01 23:45:06 +00:00
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"time"
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"unicode/utf8"
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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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)
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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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2023-01-11 00:12:59 +00:00
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// https://httpwg.org/specs/rfc7540.html#SettingValues
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2018-05-01 23:45:06 +00:00
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http2InitHeaderTableSize = 4096
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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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2019-04-17 17:15:55 +00:00
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// HTTPStatusConvTab is the HTTP status code to gRPC error code conversion table.
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HTTPStatusConvTab = map[int]codes.Code{
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2018-05-01 23:45:06 +00:00
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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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2023-12-11 11:58:19 +00:00
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var grpcStatusDetailsBinHeader = "grpc-status-details-bin"
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2018-05-01 23:45:06 +00:00
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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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2019-04-17 17:15:55 +00:00
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// Intentionally exclude grpc-previous-rpc-attempts and
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// grpc-retry-pushback-ms, which are "reserved", but their API
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// intentionally works via metadata.
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2018-05-01 23:45:06 +00:00
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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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2019-04-17 17:15:55 +00:00
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// isWhitelistedHeader checks whether hdr should be propagated into metadata
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// visible to users, even though it is classified as "reserved", above.
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2018-05-01 23:45:06 +00:00
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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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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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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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func decodeTimeout(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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2019-04-17 17:15:55 +00:00
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if size > 9 {
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// Spec allows for 8 digits plus the unit.
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return 0, fmt.Errorf("transport: timeout string is too long: %q", s)
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}
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2018-05-01 23:45:06 +00:00
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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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2019-04-17 17:15:55 +00:00
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const maxHours = math.MaxInt64 / int64(time.Hour)
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if d == time.Hour && t > maxHours {
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// This timeout would overflow math.MaxInt64; clamp it.
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return time.Duration(math.MaxInt64), nil
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}
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2018-05-01 23:45:06 +00:00
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return d * time.Duration(t), nil
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}
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const (
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spaceByte = ' '
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tildeByte = '~'
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percentByte = '%'
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)
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// encodeGrpcMessage is used to encode status code in header field
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// "grpc-message". It does percent encoding and also replaces invalid utf-8
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// characters with Unicode replacement character.
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//
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// It checks to see if each individual byte in msg is an allowable byte, and
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// then either percent encoding or passing it through. When percent encoding,
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// the byte is converted into hexadecimal notation with a '%' prepended.
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func encodeGrpcMessage(msg string) string {
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if msg == "" {
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return ""
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}
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lenMsg := len(msg)
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for i := 0; i < lenMsg; i++ {
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c := msg[i]
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if !(c >= spaceByte && c <= tildeByte && c != percentByte) {
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return encodeGrpcMessageUnchecked(msg)
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}
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}
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return msg
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}
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func encodeGrpcMessageUnchecked(msg string) string {
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2023-01-11 00:12:59 +00:00
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var sb strings.Builder
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2018-05-01 23:45:06 +00:00
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for len(msg) > 0 {
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r, size := utf8.DecodeRuneInString(msg)
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for _, b := range []byte(string(r)) {
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if size > 1 {
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// If size > 1, r is not ascii. Always do percent encoding.
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2023-01-11 00:12:59 +00:00
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fmt.Fprintf(&sb, "%%%02X", b)
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2018-05-01 23:45:06 +00:00
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continue
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}
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// The for loop is necessary even if size == 1. r could be
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// utf8.RuneError.
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//
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// fmt.Sprintf("%%%02X", utf8.RuneError) gives "%FFFD".
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if b >= spaceByte && b <= tildeByte && b != percentByte {
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2023-01-11 00:12:59 +00:00
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sb.WriteByte(b)
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2018-05-01 23:45:06 +00:00
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} else {
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2023-01-11 00:12:59 +00:00
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fmt.Fprintf(&sb, "%%%02X", b)
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2018-05-01 23:45:06 +00:00
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}
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}
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msg = msg[size:]
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}
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2023-01-11 00:12:59 +00:00
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return sb.String()
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2018-05-01 23:45:06 +00:00
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}
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// decodeGrpcMessage decodes the msg encoded by encodeGrpcMessage.
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func decodeGrpcMessage(msg string) string {
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if msg == "" {
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return ""
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}
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lenMsg := len(msg)
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for i := 0; i < lenMsg; i++ {
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if msg[i] == percentByte && i+2 < lenMsg {
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return decodeGrpcMessageUnchecked(msg)
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}
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}
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return msg
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}
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func decodeGrpcMessageUnchecked(msg string) string {
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2023-01-11 00:12:59 +00:00
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var sb strings.Builder
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2018-05-01 23:45:06 +00:00
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lenMsg := len(msg)
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for i := 0; i < lenMsg; i++ {
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c := msg[i]
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if c == percentByte && i+2 < lenMsg {
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parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
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if err != nil {
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2023-01-11 00:12:59 +00:00
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sb.WriteByte(c)
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2018-05-01 23:45:06 +00:00
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} else {
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2023-01-11 00:12:59 +00:00
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sb.WriteByte(byte(parsed))
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2018-05-01 23:45:06 +00:00
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i += 2
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}
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} else {
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2023-01-11 00:12:59 +00:00
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sb.WriteByte(c)
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2018-05-01 23:45:06 +00:00
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}
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}
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2023-01-11 00:12:59 +00:00
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return sb.String()
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2018-05-01 23:45:06 +00:00
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}
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type bufWriter struct {
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2023-12-11 11:58:19 +00:00
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pool *sync.Pool
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2018-05-01 23:45:06 +00:00
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buf []byte
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offset int
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batchSize int
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conn net.Conn
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err error
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}
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2023-12-11 11:58:19 +00:00
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func newBufWriter(conn net.Conn, batchSize int, pool *sync.Pool) *bufWriter {
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w := &bufWriter{
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2018-05-01 23:45:06 +00:00
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batchSize: batchSize,
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conn: conn,
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2023-12-11 11:58:19 +00:00
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pool: pool,
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2018-05-01 23:45:06 +00:00
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}
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2023-12-11 11:58:19 +00:00
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// this indicates that we should use non shared buf
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if pool == nil {
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w.buf = make([]byte, batchSize)
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}
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return w
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2018-05-01 23:45:06 +00:00
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}
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func (w *bufWriter) Write(b []byte) (n int, err error) {
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if w.err != nil {
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return 0, w.err
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}
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2019-04-17 17:15:55 +00:00
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if w.batchSize == 0 { // Buffer has been disabled.
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2023-12-11 11:58:19 +00:00
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n, err = w.conn.Write(b)
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return n, toIOError(err)
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}
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if w.buf == nil {
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b := w.pool.Get().(*[]byte)
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w.buf = *b
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2019-04-17 17:15:55 +00:00
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}
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2018-05-01 23:45:06 +00:00
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for len(b) > 0 {
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nn := copy(w.buf[w.offset:], b)
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b = b[nn:]
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w.offset += nn
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n += nn
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if w.offset >= w.batchSize {
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2023-12-11 11:58:19 +00:00
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err = w.flushKeepBuffer()
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2018-05-01 23:45:06 +00:00
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}
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}
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return n, err
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}
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func (w *bufWriter) Flush() error {
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2023-12-11 11:58:19 +00:00
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err := w.flushKeepBuffer()
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// Only release the buffer if we are in a "shared" mode
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|
|
if w.buf != nil && w.pool != nil {
|
|
|
|
b := w.buf
|
|
|
|
w.pool.Put(&b)
|
|
|
|
w.buf = nil
|
|
|
|
}
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
|
|
|
func (w *bufWriter) flushKeepBuffer() error {
|
2018-05-01 23:45:06 +00:00
|
|
|
if w.err != nil {
|
|
|
|
return w.err
|
|
|
|
}
|
|
|
|
if w.offset == 0 {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
_, w.err = w.conn.Write(w.buf[:w.offset])
|
2023-12-11 11:58:19 +00:00
|
|
|
w.err = toIOError(w.err)
|
2018-05-01 23:45:06 +00:00
|
|
|
w.offset = 0
|
|
|
|
return w.err
|
|
|
|
}
|
|
|
|
|
2023-12-11 11:58:19 +00:00
|
|
|
type ioError struct {
|
|
|
|
error
|
|
|
|
}
|
|
|
|
|
|
|
|
func (i ioError) Unwrap() error {
|
|
|
|
return i.error
|
|
|
|
}
|
|
|
|
|
|
|
|
func isIOError(err error) bool {
|
|
|
|
return errors.As(err, &ioError{})
|
|
|
|
}
|
|
|
|
|
|
|
|
func toIOError(err error) error {
|
|
|
|
if err == nil {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
return ioError{error: err}
|
|
|
|
}
|
|
|
|
|
2018-05-01 23:45:06 +00:00
|
|
|
type framer struct {
|
|
|
|
writer *bufWriter
|
|
|
|
fr *http2.Framer
|
|
|
|
}
|
|
|
|
|
2023-12-11 11:58:19 +00:00
|
|
|
var writeBufferPoolMap map[int]*sync.Pool = make(map[int]*sync.Pool)
|
|
|
|
var writeBufferMutex sync.Mutex
|
|
|
|
|
|
|
|
func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, sharedWriteBuffer bool, maxHeaderListSize uint32) *framer {
|
2019-04-17 17:15:55 +00:00
|
|
|
if writeBufferSize < 0 {
|
|
|
|
writeBufferSize = 0
|
|
|
|
}
|
|
|
|
var r io.Reader = conn
|
|
|
|
if readBufferSize > 0 {
|
|
|
|
r = bufio.NewReaderSize(r, readBufferSize)
|
|
|
|
}
|
2023-12-11 11:58:19 +00:00
|
|
|
var pool *sync.Pool
|
|
|
|
if sharedWriteBuffer {
|
|
|
|
pool = getWriteBufferPool(writeBufferSize)
|
|
|
|
}
|
|
|
|
w := newBufWriter(conn, writeBufferSize, pool)
|
2018-05-01 23:45:06 +00:00
|
|
|
f := &framer{
|
|
|
|
writer: w,
|
|
|
|
fr: http2.NewFramer(w, r),
|
|
|
|
}
|
2019-10-02 20:56:28 +00:00
|
|
|
f.fr.SetMaxReadFrameSize(http2MaxFrameLen)
|
2018-05-01 23:45:06 +00:00
|
|
|
// 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()
|
2019-04-17 17:15:55 +00:00
|
|
|
f.fr.MaxHeaderListSize = maxHeaderListSize
|
2018-05-01 23:45:06 +00:00
|
|
|
f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
|
|
|
|
return f
|
|
|
|
}
|
2022-01-25 13:15:24 +00:00
|
|
|
|
2023-12-11 11:58:19 +00:00
|
|
|
func getWriteBufferPool(writeBufferSize int) *sync.Pool {
|
|
|
|
writeBufferMutex.Lock()
|
|
|
|
defer writeBufferMutex.Unlock()
|
|
|
|
size := writeBufferSize * 2
|
|
|
|
pool, ok := writeBufferPoolMap[size]
|
|
|
|
if ok {
|
|
|
|
return pool
|
|
|
|
}
|
|
|
|
pool = &sync.Pool{
|
|
|
|
New: func() any {
|
|
|
|
b := make([]byte, size)
|
|
|
|
return &b
|
|
|
|
},
|
|
|
|
}
|
|
|
|
writeBufferPoolMap[size] = pool
|
|
|
|
return pool
|
|
|
|
}
|
|
|
|
|
2022-01-25 13:15:24 +00:00
|
|
|
// parseDialTarget returns the network and address to pass to dialer.
|
|
|
|
func parseDialTarget(target string) (string, string) {
|
|
|
|
net := "tcp"
|
|
|
|
m1 := strings.Index(target, ":")
|
|
|
|
m2 := strings.Index(target, ":/")
|
|
|
|
// handle unix:addr which will fail with url.Parse
|
|
|
|
if m1 >= 0 && m2 < 0 {
|
|
|
|
if n := target[0:m1]; n == "unix" {
|
|
|
|
return n, target[m1+1:]
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if m2 >= 0 {
|
|
|
|
t, err := url.Parse(target)
|
|
|
|
if err != nil {
|
|
|
|
return net, target
|
|
|
|
}
|
|
|
|
scheme := t.Scheme
|
|
|
|
addr := t.Path
|
|
|
|
if scheme == "unix" {
|
|
|
|
if addr == "" {
|
|
|
|
addr = t.Host
|
|
|
|
}
|
|
|
|
return scheme, addr
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return net, target
|
|
|
|
}
|