Method handleClose

src/remote/SessionsWebSocket.ts:234–288

* Handle WebSocket close

(closeCode: number)

   * Handle WebSocket close
   */
  private handleClose(closeCode: number): void {
    this.stopPingInterval()

    if (this.state === 'closed') {
      return
    }

    this.ws = null

    const previousState = this.state
    this.state = 'closed'

    // Permanent codes: stop reconnecting — server has definitively ended the session
    if (PERMANENT_CLOSE_CODES.has(closeCode)) {
      logForDebugging(
        `[SessionsWebSocket] Permanent close code ${closeCode}, not reconnecting`,
      )
      this.callbacks.onClose?.()
      return
    }

    // 4001 (session not found) can be transient during compaction: the
    // server may briefly consider the session stale while the CLI worker
    // is busy with the compaction API call and not emitting events.
    if (closeCode === 4001) {
      this.sessionNotFoundRetries++
      if (this.sessionNotFoundRetries > MAX_SESSION_NOT_FOUND_RETRIES) {
        logForDebugging(
          `[SessionsWebSocket] 4001 retry budget exhausted (${MAX_SESSION_NOT_FOUND_RETRIES}), not reconnecting`,
        )
        this.callbacks.onClose?.()
        return
      }
      this.scheduleReconnect(
        RECONNECT_DELAY_MS * this.sessionNotFoundRetries,
        `4001 attempt ${this.sessionNotFoundRetries}/${MAX_SESSION_NOT_FOUND_RETRIES}`,
      )
      return
    }

    // Attempt reconnection if we were connected
    if (
      previousState === 'connected' &&
      this.reconnectAttempts < MAX_RECONNECT_ATTEMPTS
    ) {
      this.reconnectAttempts++
      this.scheduleReconnect(
        RECONNECT_DELAY_MS,
        `attempt ${this.reconnectAttempts}/${MAX_RECONNECT_ATTEMPTS}`,
      )
    } else {
      logForDebugging('[SessionsWebSocket] Not reconnecting')
      this.callbacks.onClose?.()
    }
  }

  private scheduleReconnect(delay: number, label: string): void {
    this.callbacks.onReconnecting?.()