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package executor
import (
"github.com/fasthttp/websocket"
json "github.com/json-iterator/go"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/pkg/pubsub"
"github.com/spiral/roadrunner/v2/plugins/logger"
"github.com/spiral/roadrunner/v2/plugins/websockets/commands"
"github.com/spiral/roadrunner/v2/plugins/websockets/connection"
"github.com/spiral/roadrunner/v2/plugins/websockets/storage"
)
type Response struct {
Topic string `json:"topic"`
Payload []string `json:"payload"`
}
type Executor struct {
conn *connection.Connection
storage *storage.Storage
log logger.Logger
// associated connection ID
connID string
// map with the pubsub drivers
pubsub map[string]pubsub.PubSub
}
// NewExecutor creates protected connection and starts command loop
func NewExecutor(conn *connection.Connection, log logger.Logger, bst *storage.Storage, connID string, pubsubs map[string]pubsub.PubSub) *Executor {
return &Executor{
conn: conn,
connID: connID,
storage: bst,
log: log,
pubsub: pubsubs,
}
}
func (e *Executor) StartCommandLoop() error { //nolint:gocognit
const op = errors.Op("executor_command_loop")
for {
mt, data, err := e.conn.Read()
if err != nil {
if mt == -1 {
e.log.Info("socket was closed", "reason", err, "message type", mt)
return nil
}
return errors.E(op, err)
}
msg := &pubsub.Msg{}
err = json.Unmarshal(data, msg)
if err != nil {
e.log.Error("error unmarshal message", "error", err)
continue
}
switch msg.Command() {
// handle leave
case commands.Join:
// associate connection with topics
e.storage.Store(e.connID, msg.Topics())
resp := &Response{
Topic: "@join",
Payload: msg.Topics(),
}
packet, err := json.Marshal(resp)
if err != nil {
e.log.Error("error marshal the body", "error", err)
continue
}
err = e.conn.Write(websocket.BinaryMessage, packet)
if err != nil {
e.log.Error("error writing payload to the connection", "payload", packet, "error", err)
continue
}
// subscribe to the topic
if br, ok := e.pubsub[msg.Broker()]; ok {
err = br.Subscribe(msg.Topics()...)
if err != nil {
e.log.Error("error subscribing to the provided topics", "topics", msg.Topics(), "error", err.Error())
// in case of error, unsubscribe connection from the dead topics
_ = br.Unsubscribe(msg.Topics()...)
continue
}
}
// handle leave
case commands.Leave:
// remove associated connections from the storage
e.storage.Remove(e.connID, msg.Topics())
resp := &Response{
Topic: "@leave",
Payload: msg.Topics(),
}
packet, err := json.Marshal(resp)
if err != nil {
e.log.Error("error marshal the body", "error", err)
continue
}
err = e.conn.Write(websocket.BinaryMessage, packet)
if err != nil {
e.log.Error("error writing payload to the connection", "payload", packet, "error", err)
continue
}
if br, ok := e.pubsub[msg.Broker()]; ok {
err = br.Unsubscribe(msg.Topics()...)
if err != nil {
e.log.Error("error subscribing to the provided topics", "topics", msg.Topics(), "error", err.Error())
continue
}
}
case commands.Headers:
default:
e.log.Warn("unknown command", "command", msg.Command())
}
}
}
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