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frame.go
160 lines (135 loc) · 2.65 KB
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frame.go
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package stomp
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"strconv"
"strings"
)
// Frame is a STOMP frame.
type Frame struct {
Command string
Headers map[string]string
Body io.ReadCloser
}
// NewFrame creates a frame with the provided command and body.
func NewFrame(cmd string, body io.Reader) *Frame {
if body == nil {
body = &bytes.Buffer{}
}
rc, ok := body.(io.ReadCloser)
if !ok {
rc = ioutil.NopCloser(body)
}
return &Frame{
Command: strings.ToUpper(cmd),
Headers: make(map[string]string),
Body: rc,
}
}
// Encoder write Frames to an ouptput stream.
type Encoder struct {
w io.Writer
}
// NewEncoder returns an encoder that writes to w.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w: w}
}
// Encode writes an encoded frame to the stream.
func (e *Encoder) Encode(f *Frame) error {
if f.Command == "HEARTBEAT" {
_, err := fmt.Fprintf(e.w, "%c", '\n')
return err
}
_, err := fmt.Fprintf(e.w, "%s\n", f.Command)
if err != nil {
return err
}
if f.Headers != nil {
for k, v := range f.Headers {
_, err = fmt.Fprintf(e.w, "%s:%s\n", k, v)
if err != nil {
return err
}
}
}
_, err = fmt.Fprintf(e.w, "%c", '\n')
if err != nil {
return err
}
if f.Body != nil {
_, err := io.Copy(e.w, f.Body)
if err != nil {
return err
}
err = f.Body.Close()
if err != nil {
return err
}
}
_, err = fmt.Fprintf(e.w, "%c", 0)
if err != nil {
return err
}
return nil
}
// Decoder reads frames from an input stream.
type Decoder struct {
r *bufio.Reader
}
// NewDecoder creates a new decoder with input stream r.
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{r: bufio.NewReader(r)}
}
// Decode decodes a frame from the input stream.
func (d *Decoder) Decode(f *Frame) error {
c, err := d.r.ReadString('\n')
if err != nil {
return err
}
if c == "\n" {
f.Command = "HEARTBEAT"
return nil
}
c = strings.Trim(c, "\r\n")
hdrs := make(map[string]string)
for {
h, err := d.r.ReadString('\n')
if err != nil {
return err
}
if h == "\n" {
break
}
h = strings.Trim(h, "\n")
m := strings.Split(h, ":")
if len(m) != 2 {
return fmt.Errorf("stomp: unable to decode frame header")
}
hdrs[m[0]] = m[1]
}
body := []byte{0}
if length, ok := hdrs["content-length"]; ok {
n, err := strconv.Atoi(length)
if err != nil {
return err
}
body, err = ioutil.ReadAll(io.LimitReader(d.r, int64(n)))
if err != nil {
return err
}
}
b, err := d.r.ReadBytes(0)
if err != nil {
return err
}
if !bytes.Equal(b, []byte{0}) {
body = append(body, b...)
}
f.Command = c
f.Headers = hdrs
f.Body = ioutil.NopCloser(bytes.NewReader(body))
return nil
}