/
channel.go
259 lines (227 loc) · 6.95 KB
/
channel.go
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package workerchannel
import (
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
"sync/atomic"
"github.com/rs/zerolog"
"github.com/byyam/mediasoup-go-worker/pkg/mediasoupdata"
"github.com/byyam/mediasoup-go-worker/pkg/zerowrapper"
"github.com/tidwall/gjson"
"github.com/byyam/mediasoup-go-worker/pkg/netparser"
)
const (
// netstring length for a 4194304 bytes payload.
NS_MESSAGE_MAX_LEN = 4194308
NS_PAYLOAD_MAX_LEN = 4194304
)
const (
UNDEFINED = "undefined"
)
type Channel struct {
logger zerolog.Logger
netParser netparser.INetParser
jsonFormat bool
// handle request message
OnRequestHandler atomic.Value // func(request RequestData) ResponseData
}
func NewChannel(netParser netparser.INetParser, id string, jsonFormat bool) *Channel {
c := &Channel{
netParser: netParser,
jsonFormat: jsonFormat,
logger: zerowrapper.NewScope(fmt.Sprintf("channel-json[%v]", jsonFormat), id),
}
c.logger.Info().Msg("channel start")
go c.runReadLoop()
return c
}
func (c *Channel) runReadLoop() {
defer c.Close()
payload := make([]byte, NS_PAYLOAD_MAX_LEN)
for {
n, err := c.netParser.ReadBuffer(payload)
if err != nil {
c.logger.Error().Err(err).Msg("Channel read buffer error")
break
}
c.logger.Debug().Str("payload", string(payload[:n])).Send()
if !c.jsonFormat {
c.processPayload(payload[:n])
} else {
c.processPayloadJsonFormat(payload[:n])
}
}
}
func (c *Channel) processPayloadJsonFormat(nsPayload []byte) {
switch nsPayload[0] {
case '{':
if err := c.processJsonMessage(nsPayload); err != nil {
c.logger.Error().Err(err).Msg("process message failed")
}
case 'X':
c.logger.Debug().Str("payload", string(nsPayload[1:])).Send()
default:
c.logger.Error().Str("payload", string(nsPayload)).Msg("unexpected data")
}
}
func (c *Channel) processPayload(nsPayload []byte) {
// https://github.com/versatica/mediasoup/commit/ed15a863a5ed095f58a16d972c8e25bf24f17933
// const request = `${id}:${method}:${handlerId}:${JSON.stringify(data)}`;
messages := strings.SplitN(string(nsPayload), ":", 4)
c.logger.Info().Strs("messages", messages).Send()
if len(messages) != 4 {
c.logger.Error().Strs("messages", messages).Msg("messages length invalid")
return
}
if err := c.processMessage(messages); err != nil {
c.logger.Error().Err(err).Msg("process message failed")
}
}
func (c *Channel) OnRequest(fn func(request RequestData) ResponseData) {
c.OnRequestHandler.Store(fn)
}
func (c *Channel) setHandlerId(method, handlerId, data string, internal *InternalData) error {
if handlerId == UNDEFINED && data != UNDEFINED {
if err := internal.Unmarshal(json.RawMessage(data)); err != nil {
return err
}
return nil
}
// get prefix of method
methodFields := strings.SplitN(method, ".", 2)
if len(methodFields) != 2 {
return errors.New("method is not formatted")
}
// set handlerId
switch methodFields[0] {
case mediasoupdata.MethodPrefixWorker, mediasoupdata.MethodPrefixRouter:
internal.RouterId = handlerId
case mediasoupdata.MethodPrefixTransport:
internal.TransportId = handlerId
case mediasoupdata.MethodPrefixProducer:
internal.ProducerId = handlerId
case mediasoupdata.MethodPrefixConsumer:
internal.ConsumerId = handlerId
case mediasoupdata.MethodPrefixRtpObserver:
internal.RtpObserverId = handlerId
default:
return errors.New("unknown method prefix")
}
// set objectId
switch methodFields[0] {
case mediasoupdata.MethodPrefixRouter:
// set ids if fields exist
value := gjson.Get(data, "transportId")
internal.TransportId = value.String()
value = gjson.Get(data, "rtpObserverId")
internal.RtpObserverId = value.String()
case mediasoupdata.MethodPrefixTransport, mediasoupdata.MethodPrefixRtpObserver: // include producer and consumer
value := gjson.Get(data, "producerId")
internal.ProducerId = value.String()
value = gjson.Get(data, "dataProducerId")
internal.DataProducerId = value.String()
}
if method == mediasoupdata.MethodTransportConsume {
value := gjson.Get(data, "consumerId")
internal.ConsumerId = value.String()
}
return nil
}
func (c *Channel) processMessage(messages []string) error {
idStr := messages[0]
method := messages[1]
handlerId := messages[2]
data := messages[3]
// decode
id, err := strconv.Atoi(idStr)
if err != nil {
return err
}
var internal InternalData
if err := c.setHandlerId(method, handlerId, data, &internal); err != nil {
c.logger.Error().Err(err).Msg("set handler Id failed")
return err
}
reqData := channelData{
Id: int64(id),
Method: method,
Internal: nil,
Data: json.RawMessage(data),
}
// handle
rspData, _ := c.handleMessage(&reqData, &internal)
c.logger.Info().Int64("id", rspData.Id).Str("method", rspData.Method).Msg("rspData")
// encode
if err := c.returnMessage(rspData); err != nil {
c.logger.Error().Err(err).Msg("return message failed")
return err
}
return nil
}
func (c *Channel) processJsonMessage(nsPayload []byte) error {
// decode
var reqData channelData
if err := json.Unmarshal(nsPayload, &reqData); err != nil {
return err
}
var internal InternalData
_ = internal.Unmarshal(reqData.Internal)
c.logger.Info().Int64("id", reqData.Id).Str("method", reqData.Method).Msg("reqData")
// handle
rspData, _ := c.handleMessage(&reqData, &internal)
// encode
if err := c.returnMessage(rspData); err != nil {
c.logger.Error().Err(err).Msg("return message failed")
}
return nil
}
func (c *Channel) returnMessage(rspData *channelData) error {
jsonByte, _ := json.Marshal(&rspData)
if len(jsonByte) > NS_MESSAGE_MAX_LEN {
return errors.New("channel response too big")
}
c.logger.Trace().Str("WriteBuffer", string(jsonByte)).Int64("id", rspData.Id).Str("method", rspData.Method).Send()
if err := c.netParser.WriteBuffer(jsonByte); err != nil {
return err
}
c.logger.Info().Str("error", rspData.Error).Int64("id", rspData.Id).Msg("response")
return nil
}
func (c *Channel) handleMessage(reqData *channelData, internal *InternalData) (*channelData, error) {
var ret ResponseData
rspData := new(channelData)
rspData.Id = reqData.Id
rspData.Method = reqData.Method
if handler, ok := c.OnRequestHandler.Load().(func(request RequestData) ResponseData); ok && handler != nil {
ret = handler(RequestData{
Method: reqData.Method,
Internal: *internal,
Data: reqData.Data,
})
} else {
rspData.Error = "OnRequestHandler not register"
}
if ret.Err != nil {
c.logger.Error().Err(ret.Err).Int64("id", reqData.Id).Str("method", reqData.Method).Msg("response error")
rspData.Error = ret.Err.Error()
rspData.Reason = ret.Err.Error()
} else {
rspData.Accepted = true
}
rspData.Data = ret.Data
return rspData, nil
}
func (c *Channel) Event(targetId int, event string) {
msg := channelData{
TargetId: strconv.Itoa(targetId),
Event: event,
}
jsonByte, _ := json.Marshal(&msg)
err := c.netParser.WriteBuffer(jsonByte)
c.logger.Info().Err(err).Str("targetId", msg.TargetId).Str("event", msg.Event).Msg("send Event msg")
}
func (c *Channel) Close() {
c.logger.Info().Msg("closed")
}