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package executor
import (
"fmt"
"net/http"
"sync"
"github.com/fasthttp/websocket"
json "github.com/json-iterator/go"
"github.com/spiral/errors"
websocketsv1 "github.com/spiral/roadrunner/v2/pkg/proto/websockets/v1beta"
"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/validator"
)
type Response struct {
Topic string `json:"topic"`
Payload []string `json:"payload"`
}
type Executor struct {
sync.Mutex
conn *connection.Connection
log logger.Logger
// associated connection ID
connID string
// map with the pubsub drivers
pubsub map[string]pubsub.PubSub
actualTopics map[string]struct{}
req *http.Request
accessValidator validator.AccessValidatorFn
}
// NewExecutor creates protected connection and starts command loop
func NewExecutor(conn *connection.Connection, log logger.Logger,
connID string, pubsubs map[string]pubsub.PubSub, av validator.AccessValidatorFn, r *http.Request) *Executor {
return &Executor{
conn: conn,
connID: connID,
log: log,
pubsub: pubsubs,
accessValidator: av,
actualTopics: make(map[string]struct{}, 10),
req: r,
}
}
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 := &websocketsv1.Message{}
err = json.Unmarshal(data, msg)
if err != nil {
e.log.Error("error unmarshal message", "error", err)
continue
}
// nil message, continue
if msg == nil {
e.log.Warn("get nil message, skipping")
continue
}
switch msg.Command {
// handle leave
case commands.Join:
e.log.Debug("get join command", "msg", msg)
val, err := e.accessValidator(e.req, msg.Topics...)
if err != nil {
if val != nil {
e.log.Debug("validation error", "status", val.Status, "headers", val.Header, "body", val.Body)
}
resp := &Response{
Topic: "#join",
Payload: msg.Topics,
}
packet, errJ := json.Marshal(resp)
if errJ != nil {
e.log.Error("error marshal the body", "error", errJ)
return errors.E(op, fmt.Errorf("%v,%v", err, errJ))
}
errW := e.conn.Write(websocket.BinaryMessage, packet)
if errW != nil {
e.log.Error("error writing payload to the connection", "payload", packet, "error", errW)
return errors.E(op, fmt.Errorf("%v,%v", err, errW))
}
continue
}
resp := &Response{
Topic: "@join",
Payload: msg.Topics,
}
packet, err := json.Marshal(resp)
if err != nil {
e.log.Error("error marshal the body", "error", err)
return errors.E(op, err)
}
err = e.conn.Write(websocket.BinaryMessage, packet)
if err != nil {
e.log.Error("error writing payload to the connection", "payload", packet, "error", err)
return errors.E(op, err)
}
// subscribe to the topic
if br, ok := e.pubsub[msg.Broker]; ok {
err = e.Set(br, msg.Topics)
if err != nil {
return errors.E(op, err)
}
}
// handle leave
case commands.Leave:
e.log.Debug("get leave command", "msg", msg)
// prepare response
resp := &Response{
Topic: "@leave",
Payload: msg.Topics,
}
packet, err := json.Marshal(resp)
if err != nil {
e.log.Error("error marshal the body", "error", err)
return errors.E(op, err)
}
err = e.conn.Write(websocket.BinaryMessage, packet)
if err != nil {
e.log.Error("error writing payload to the connection", "payload", packet, "error", err)
return errors.E(op, err)
}
if br, ok := e.pubsub[msg.Broker]; ok {
err = e.Leave(br, msg.Topics)
if err != nil {
return errors.E(op, err)
}
}
case commands.Headers:
default:
e.log.Warn("unknown command", "command", msg.Command)
}
}
}
func (e *Executor) Set(br pubsub.PubSub, topics []string) error {
// associate connection with topics
err := br.Subscribe(e.connID, topics...)
if err != nil {
e.log.Error("error subscribing to the provided topics", "topics", topics, "error", err.Error())
// in case of error, unsubscribe connection from the dead topics
_ = br.Unsubscribe(e.connID, topics...)
return err
}
// save topics for the connection
for i := 0; i < len(topics); i++ {
e.actualTopics[topics[i]] = struct{}{}
}
return nil
}
func (e *Executor) Leave(br pubsub.PubSub, topics []string) error {
// remove associated connections from the storage
err := br.Unsubscribe(e.connID, topics...)
if err != nil {
e.log.Error("error subscribing to the provided topics", "topics", topics, "error", err.Error())
return err
}
// remove topics for the connection
for i := 0; i < len(topics); i++ {
delete(e.actualTopics, topics[i])
}
return nil
}
func (e *Executor) CleanUp() {
// unsubscribe particular connection from the topics
for topic := range e.actualTopics {
// here
for _, ps := range e.pubsub {
_ = ps.Unsubscribe(e.connID, topic)
}
}
// clean up the actualTopics data
for k := range e.actualTopics {
delete(e.actualTopics, k)
}
}
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