mirror of
https://github.com/taigrr/wasm-experiments
synced 2025-01-18 04:03:21 -08:00
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// +build js,wasm
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/*
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*
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* Copyright 2018 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 grpc
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import (
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"bufio"
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"bytes"
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"errors"
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"io"
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"net/http"
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"strings"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"google.golang.org/grpc/transport"
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)
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func parseMsg(p *parser, s *transport.Stream, maxReceiveMessageSize int, pf payloadFormat, d []byte) ([]byte, error) {
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if pf == trailer || pf == compressedTrailer {
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trailers, err := readTrailers(bytes.NewReader(d), len(d))
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if err != nil {
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return nil, status.Errorf(codes.Internal, "grpc: failed to parse returned trailers: %v", err)
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}
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// Holy layer violation :(
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// This is necessary because the gRPC-Web trailers are part of the response body. See
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// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md#protocol-differences-vs-grpc-over-http2
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err = s.SetTrailers(trailers)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "grpc: failed to set trailers on stream: %v", err)
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}
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// Sanity check that parser is done. This should return io.EOF
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_, _, err = p.recvMsg(maxReceiveMessageSize)
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if err == io.EOF {
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return nil, err
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}
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return nil, status.Errorf(codes.Internal, "grpc: unexpected error reading last message from stream: %v", err)
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}
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return d, nil
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}
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// readTrailers consumes the rest of the reader and parses the
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// contents as "\r\n"-separated trailers, in accordance with
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// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-WEB.md#protocol-differences-vs-grpc-over-http2
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func readTrailers(in io.Reader, bufSize int) (http.Header, error) {
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s := bufio.NewScanner(in)
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buf := make([]byte, bufSize)
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s.Buffer(buf, len(buf))
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// Uses http.Header instead of metadata.MD as .Add method
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// normalizes trailer keys.
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trailers := http.Header{}
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for s.Scan() {
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v := s.Text()
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kv := strings.SplitN(v, ": ", 2)
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if len(kv) != 2 {
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return nil, errors.New("malformed trailer: " + v)
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}
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trailers.Add(kv[0], kv[1])
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}
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return trailers, s.Err()
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}
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