/
payload.go
170 lines (154 loc) · 3.66 KB
/
payload.go
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package parser
import (
"bufio"
"bytes"
"fmt"
"io"
"strconv"
"sync"
)
// payloadEncoder is the encoder to encode packets as payload. It can be used in multi-thread.
type PayloadEncoder struct {
buffers [][]byte
locker sync.Mutex
isString bool
}
// NewStringPayloadEncoder returns the encoder which encode as string.
func NewStringPayloadEncoder() *PayloadEncoder {
return &PayloadEncoder{
isString: true,
}
}
// NewStringPayloadEncoder returns the encoder which encode as binary.
func NewBinaryPayloadEncoder() *PayloadEncoder {
return &PayloadEncoder{
isString: false,
}
}
type encoder struct {
*PacketEncoder
buf *bytes.Buffer
binaryPrefix string
payload *PayloadEncoder
}
func (e encoder) Close() error {
if err := e.PacketEncoder.Close(); err != nil {
return err
}
var buffer []byte
if e.payload.isString {
buffer = []byte(fmt.Sprintf("%d:%s", e.buf.Len(), e.buf.String()))
} else {
buffer = []byte(fmt.Sprintf("%s%d", e.binaryPrefix, e.buf.Len()))
for i, n := 0, len(buffer); i < n; i++ {
buffer[i] = buffer[i] - '0'
}
buffer = append(buffer, 0xff)
buffer = append(buffer, e.buf.Bytes()...)
}
e.payload.locker.Lock()
e.payload.buffers = append(e.payload.buffers, buffer)
e.payload.locker.Unlock()
return nil
}
// NextString returns the encoder with packet type t and encode as string.
func (e *PayloadEncoder) NextString(t PacketType) (io.WriteCloser, error) {
buf := bytes.NewBuffer(nil)
pEncoder, err := NewStringEncoder(buf, t)
if err != nil {
return nil, err
}
return encoder{
PacketEncoder: pEncoder,
buf: buf,
binaryPrefix: "0",
payload: e,
}, nil
}
// NextBinary returns the encoder with packet type t and encode as binary.
func (e *PayloadEncoder) NextBinary(t PacketType) (io.WriteCloser, error) {
buf := bytes.NewBuffer(nil)
var pEncoder *PacketEncoder
var err error
if e.isString {
pEncoder, err = NewB64Encoder(buf, t)
} else {
pEncoder, err = NewBinaryEncoder(buf, t)
}
if err != nil {
return nil, err
}
return encoder{
PacketEncoder: pEncoder,
buf: buf,
binaryPrefix: "1",
payload: e,
}, nil
}
// EncodeTo writes encoded payload to writer w. It will clear the buffer of encoder.
func (e *PayloadEncoder) EncodeTo(w io.Writer) error {
e.locker.Lock()
buffers := e.buffers
e.buffers = nil
e.locker.Unlock()
for _, b := range buffers {
for len(b) > 0 {
n, err := w.Write(b)
if err != nil {
return err
}
b = b[n:]
}
}
return nil
}
//IsString returns true if payload encode to string, otherwise returns false.
func (e *PayloadEncoder) IsString() bool {
return e.isString
}
// payloadDecoder is the decoder to decode payload.
type PayloadDecoder struct {
r *bufio.Reader
}
// NewPaylaodDecoder returns the payload decoder which read from reader r.
func NewPayloadDecoder(r io.Reader) *PayloadDecoder {
br, ok := r.(*bufio.Reader)
if !ok {
br = bufio.NewReader(r)
}
return &PayloadDecoder{
r: br,
}
}
// Next returns the packet decoder. Make sure it will be closed after used.
func (d *PayloadDecoder) Next() (*PacketDecoder, error) {
firstByte, err := d.r.Peek(1)
if err != nil {
return nil, err
}
isBinary := firstByte[0] < '0'
delim := byte(':')
if isBinary {
d.r.ReadByte()
delim = 0xff
}
line, err := d.r.ReadBytes(delim)
if err != nil {
return nil, err
}
l := len(line)
if l < 1 {
return nil, fmt.Errorf("invalid input")
}
lenByte := line[:l-1]
if isBinary {
for i, n := 0, l; i < n; i++ {
line[i] = line[i] + '0'
}
}
packetLen, err := strconv.ParseInt(string(lenByte), 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid input")
}
return NewDecoder(newLimitReader(d.r, int(packetLen)))
}