Example #1
0
func readMessage(buf *streambuf.Buffer) (*message, error) {
	if !buf.Avail(2) {
		return nil, nil
	}

	version, _ := buf.ReadNetUint8At(0)
	if version != '2' {
		return nil, errors.New("version error")
	}

	code, _ := buf.ReadNetUint8At(1)
	switch code {
	case 'W':
		if !buf.Avail(6) {
			return nil, nil
		}
		size, _ := buf.ReadNetUint32At(2)
		buf.Advance(6)
		buf.Reset()
		return &message{code: code, size: size}, buf.Err()
	case 'C':
		if !buf.Avail(6) {
			return nil, nil
		}
		len, _ := buf.ReadNetUint32At(2)
		if !buf.Avail(int(len) + 6) {
			return nil, nil
		}
		buf.Advance(6)

		tmp, _ := buf.Collect(int(len))
		buf.Reset()

		dataBuf := streambuf.New(nil)
		// decompress data
		decomp, err := zlib.NewReader(streambuf.NewFixed(tmp))
		if err != nil {
			return nil, err
		}
		// dataBuf.ReadFrom(streambuf.NewFixed(tmp))
		dataBuf.ReadFrom(decomp)
		decomp.Close()

		// unpack data
		dataBuf.Fix()
		var events []*message
		for dataBuf.Len() > 0 {
			version, _ := dataBuf.ReadNetUint8()
			if version != '2' {
				return nil, errors.New("version error 2")
			}

			code, _ := dataBuf.ReadNetUint8()
			if code != 'J' {
				return nil, errors.New("expected json data frame")
			}

			seq, _ := dataBuf.ReadNetUint32()
			payloadLen, _ := dataBuf.ReadNetUint32()
			jsonRaw, _ := dataBuf.Collect(int(payloadLen))

			var doc interface{}
			err = json.Unmarshal(jsonRaw, &doc)
			if err != nil {
				return nil, err
			}

			events = append(events, &message{
				code: code,
				seq:  seq,
				doc:  doc.(map[string]interface{}),
			})
		}
		return &message{code: 'C', events: events}, nil
	default:
		return nil, errors.New("unknown code")
	}
}
func readMessage(buf *streambuf.Buffer) (*message, error) {
	if !buf.Avail(2) {
		return nil, nil
	}

	version, _ := buf.ReadNetUint8At(0)
	if version != '1' {
		return nil, errors.New("version error")
	}

	code, _ := buf.ReadNetUint8At(1)
	switch code {
	case 'W':
		if !buf.Avail(6) {
			return nil, nil
		}
		size, _ := buf.ReadNetUint32At(2)
		buf.Advance(6)
		buf.Reset()
		return &message{code: code, size: size}, buf.Err()
	case 'C':
		if !buf.Avail(6) {
			return nil, nil
		}
		len, _ := buf.ReadNetUint32At(2)
		if !buf.Avail(int(len) + 6) {
			return nil, nil
		}
		buf.Advance(6)

		tmp, _ := buf.Collect(int(len))
		buf.Reset()

		dataBuf := streambuf.New(nil)
		// decompress data
		decomp, err := zlib.NewReader(streambuf.NewFixed(tmp))
		if err != nil {
			return nil, err
		}
		// dataBuf.ReadFrom(streambuf.NewFixed(tmp))
		dataBuf.ReadFrom(decomp)
		decomp.Close()

		// unpack data
		dataBuf.Fix()
		var events []*message
		for dataBuf.Len() > 0 {
			version, _ := dataBuf.ReadNetUint8()
			if version != '1' {
				return nil, errors.New("version error 2")
			}

			code, _ := dataBuf.ReadNetUint8()
			if code != 'D' {
				return nil, errors.New("expected data frame")
			}

			seq, _ := dataBuf.ReadNetUint32()
			pairCount, _ := dataBuf.ReadNetUint32()
			kv := make(map[string]string)
			for i := 0; i < int(pairCount); i++ {
				keyLen, _ := dataBuf.ReadNetUint32()
				keyRaw, _ := dataBuf.Collect(int(keyLen))
				valLen, _ := dataBuf.ReadNetUint32()
				valRaw, _ := dataBuf.Collect(int(valLen))
				kv[string(keyRaw)] = string(valRaw)
			}

			events = append(events, &message{code: code, seq: seq, kv: kv})
		}
		return &message{code: 'C', events: events}, nil
	default:
		return nil, errors.New("unknown code")
	}
}