// packs string literal into json object structure around variable "varName"
// data string should already be in json format
func (this *Neo4j) pack(name string, data string) ([]byte, os.Error) {
buf := new(bytes.Buffer)
err := json.Compact(buf, []byte("{ \""+name+"\": "+data+" } ")) // pkg data into new json string then compact() it onto our empty buffer
if err != nil {
return nil, err
}
return buf.Bytes(), err
}
// Encode takes payload, encodes it and writes it to dst. Payload must be one
// of the following: a heartbeat, a handshake, []byte, string, int or anything
// than can be marshalled by the default json package. If payload can't be
// encoded or the writing fails, an error will be returned.
func (enc *sioStreamingEncoder) Encode(dst io.Writer, payload interface{}) (err os.Error) {
enc.elem.Reset()
switch t := payload.(type) {
case heartbeat:
s := strconv.Itoa(int(t))
_, err = fmt.Fprintf(dst, "%d:%d:%s,", sioMessageTypeHeartbeat, len(s), s)
case handshake:
_, err = fmt.Fprintf(dst, "%d:%d:%s,", sioMessageTypeHandshake, len(t), t)
case []byte:
l := utf8.RuneCount(t)
if l == 0 {
break
}
_, err = fmt.Fprintf(dst, "%d:%d::%s,", sioMessageTypeMessage, 1+l, t)
case string:
l := utf8.RuneCountInString(t)
if l == 0 {
break
}
_, err = fmt.Fprintf(dst, "%d:%d::%s,", sioMessageTypeMessage, 1+l, t)
case int:
s := strconv.Itoa(t)
if s == "" {
break
}
_, err = fmt.Fprintf(dst, "%d:%d::%s,", sioMessageTypeMessage, 1+len(s), s)
default:
data, err := json.Marshal(payload)
if len(data) == 0 || err != nil {
break
}
err = json.Compact(&enc.elem, data)
if err != nil {
break
}
_, err = fmt.Fprintf(dst, "%d:%d:%s\n:", sioMessageTypeMessage, 2+len(SIOAnnotationJSON)+utf8.RuneCount(enc.elem.Bytes()), SIOAnnotationJSON)
if err == nil {
_, err = enc.elem.WriteTo(dst)
if err == nil {
_, err = dst.Write([]byte{','})
}
}
}
return err
}
// Encode takes payload, encodes it and writes it to dst. Payload must be one
// of the following: a heartbeat, a handshake, []byte, string, int or anything
// than can be marshalled by the default json package. If payload can't be
// encoded or the writing fails, an error will be returned.
func (enc *sioEncoder) Encode(dst io.Writer, payload interface{}) (err os.Error) {
enc.elem.Reset()
switch t := payload.(type) {
case heartbeat:
s := strconv.Itoa(int(t))
_, err = fmt.Fprintf(dst, "%s%d%s%s%s", sioFrameDelim, len(s)+len(sioFrameDelimHeartbeat), sioFrameDelim, sioFrameDelimHeartbeat, s)
case handshake:
_, err = fmt.Fprintf(dst, "%s%d%s%s", sioFrameDelim, len(t), sioFrameDelim, t)
case []byte:
l := utf8.RuneCount(t)
if l == 0 {
break
}
_, err = fmt.Fprintf(dst, "%s%d%s%s", sioFrameDelim, l, sioFrameDelim, t)
case string:
l := utf8.RuneCountInString(t)
if l == 0 {
break
}
_, err = fmt.Fprintf(dst, "%s%d%s%s", sioFrameDelim, l, sioFrameDelim, t)
case int:
s := strconv.Itoa(t)
if s == "" {
break
}
_, err = fmt.Fprintf(dst, "%s%d%s%s", sioFrameDelim, len(s), sioFrameDelim, s)
default:
data, err := json.Marshal(payload)
if len(data) == 0 || err != nil {
break
}
err = json.Compact(&enc.elem, data)
if err != nil {
break
}
_, err = fmt.Fprintf(dst, "%s%d%s%s", sioFrameDelim, utf8.RuneCount(enc.elem.Bytes())+len(sioFrameDelimJSON), sioFrameDelim, sioFrameDelimJSON)
if err == nil {
_, err = enc.elem.WriteTo(dst)
}
}
return err
}
func (a *Apns) SendMessage(identifier, expiry uint32, token []byte, payload interface{}) (<-chan *os.Error, os.Error) {
buf := make([]byte, 256).(*buffer)
if identifier == 0 && expiry == 0 {
// use simple format
buf.writeByte(0)
} else {
// use extended format
buf.writeByte(1)
buf.writeUint32(identifier)
buf.writeUint32(expiry)
}
// append the token
buf.writeUint16(uint16(len(token)))
buf.write(token)
// build the JSON data
rawJson, err := json.Marshal(payload)
if err != nil {
return nil, err
}
// compact it (requires a bytes.Buffer to store the compacted version)
jbuf := &bytes.Buffer{}
err = json.Compact(jbuf, rawJson)
if err != nil {
return nil, err
}
// write the JSOB payload into the command buffer
buf.writeUint32(uint32(jbuf.Len()))
buf.write(jbuf.Bytes())
// all done-- now send it!
var sent int = 0
l := len(buf)
for sent < l {
n, err = a.conn.Write(buf[sent:l])
if err != nil {
return nil, err
}
sent += n
}
// sent successfully, return a channel which will funnel the result back asynchronously
errchan := make(chan *os.Error)
if identifier != 0 {
if a.waitReplies == nil {
a.waitReplies = make(map[uint32]chan result)
}
a.waitReplies[identifier] = make(chan result, 1)
go func() {
var r result
select {
case r = <-a.waitReplies[identifier]:
if r.status != 0 {
// send an error
errchan <- *Error{r.status}
} else {
errchan <- nil
}
}
}()
}
return errchan, nil
}