mirror of https://github.com/caddyserver/caddy
146 lines
3.4 KiB
Go
146 lines
3.4 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy 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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package fastcgi
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import (
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"bytes"
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"encoding/binary"
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)
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// streamWriter abstracts out the separation of a stream into discrete records.
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// It only writes maxWrite bytes at a time.
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type streamWriter struct {
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c *client
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h header
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buf *bytes.Buffer
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recType uint8
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}
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func (w *streamWriter) writeRecord(recType uint8, content []byte) (err error) {
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w.h.init(recType, w.c.reqID, len(content))
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w.buf.Write(pad[:8])
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w.writeHeader()
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w.buf.Write(content)
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w.buf.Write(pad[:w.h.PaddingLength])
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_, err = w.buf.WriteTo(w.c.rwc)
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return err
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}
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func (w *streamWriter) writeBeginRequest(role uint16, flags uint8) error {
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b := [8]byte{byte(role >> 8), byte(role), flags}
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return w.writeRecord(BeginRequest, b[:])
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}
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func (w *streamWriter) Write(p []byte) (int, error) {
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// init header
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if w.buf.Len() < 8 {
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w.buf.Write(pad[:8])
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}
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nn := 0
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for len(p) > 0 {
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n := len(p)
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nl := maxWrite + 8 - w.buf.Len()
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if n > nl {
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n = nl
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w.buf.Write(p[:n])
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if err := w.Flush(); err != nil {
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return nn, err
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}
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// reset headers
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w.buf.Write(pad[:8])
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} else {
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w.buf.Write(p[:n])
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}
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nn += n
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p = p[n:]
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}
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return nn, nil
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}
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func (w *streamWriter) endStream() error {
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// send empty record to close the stream
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return w.writeRecord(w.recType, nil)
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}
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func (w *streamWriter) writePairs(pairs map[string]string) error {
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b := make([]byte, 8)
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nn := 0
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// init headers
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w.buf.Write(b)
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for k, v := range pairs {
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m := 8 + len(k) + len(v)
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if m > maxWrite {
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// param data size exceed 65535 bytes"
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vl := maxWrite - 8 - len(k)
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v = v[:vl]
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}
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n := encodeSize(b, uint32(len(k)))
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n += encodeSize(b[n:], uint32(len(v)))
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m = n + len(k) + len(v)
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if (nn + m) > maxWrite {
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if err := w.Flush(); err != nil {
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return err
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}
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// reset headers
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w.buf.Write(b)
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nn = 0
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}
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nn += m
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w.buf.Write(b[:n])
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w.buf.WriteString(k)
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w.buf.WriteString(v)
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}
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return w.FlushStream()
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}
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func encodeSize(b []byte, size uint32) int {
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if size > 127 {
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size |= 1 << 31
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binary.BigEndian.PutUint32(b, size)
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return 4
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}
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b[0] = byte(size)
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return 1
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}
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// writeHeader populate header wire data in buf, it abuses buffer.Bytes() modification
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func (w *streamWriter) writeHeader() {
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h := w.buf.Bytes()[:8]
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h[0] = w.h.Version
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h[1] = w.h.Type
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binary.BigEndian.PutUint16(h[2:4], w.h.ID)
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binary.BigEndian.PutUint16(h[4:6], w.h.ContentLength)
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h[6] = w.h.PaddingLength
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h[7] = w.h.Reserved
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}
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// Flush write buffer data to the underlying connection, it assumes header data is the first 8 bytes of buf
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func (w *streamWriter) Flush() error {
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w.h.init(w.recType, w.c.reqID, w.buf.Len()-8)
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w.writeHeader()
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w.buf.Write(pad[:w.h.PaddingLength])
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_, err := w.buf.WriteTo(w.c.rwc)
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return err
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}
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// FlushStream flush data then end current stream
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func (w *streamWriter) FlushStream() error {
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if err := w.Flush(); err != nil {
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return err
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}
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return w.endStream()
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}
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