public async launch()

in src/simulator.ts [129:192]
63 lines of code
7 McCabe index (conditional complexity)

  public async launch(deviceItem: DeviceItem): Promise<void> {
    const deviceConnectionStrings = [];
    if (this.isProcessing()) {
      this.closeDuration = 3500;
      await this.showWebview(false);
      this.telemetry(Constants.SimulatorLaunchEvent, true);
      await this.delay(this.closeDuration);
      this.closeDuration = 0;
    } else {
      this.iotHubConnectionString = await Utility.getConnectionString(
        Constants.IotHubConnectionStringKey,
        Constants.IotHubConnectionStringTitle,
        true,
      );
      if (deviceItem) {
        const hostName = ConnectionString.parse(this.iotHubConnectionString)
          .HostName;
        const hostNamePersisted = this.persistedInputs.hostName;
        deviceConnectionStrings.push(deviceItem.connectionString);
        const deviceConnectionStringsPersisted = this.persistedInputs
          .deviceConnectionStrings;
        await this.showWebview(
          hostName !== hostNamePersisted ||
            deviceConnectionStrings !== deviceConnectionStringsPersisted,
          hostName,
          deviceConnectionStrings,
        );
        this.telemetry(Constants.SimulatorLaunchEvent, true);
      } else {
        // Exit when no connection string found or the connection string is invalid.
        if (!this.iotHubConnectionString) {
          const errorMessage = "Failed to launch Send D2C Messages webview: No IoT Hub Connection String Found.";
          vscode.window.showErrorMessage(errorMessage);
          this.telemetry(Constants.SimulatorLaunchEvent, false, {
            error: errorMessage,
          });
          return;
        }
        try {
          const deviceList: vscode.TreeItem[] = await Utility.getDeviceList(this.iotHubConnectionString, Constants.ExtensionContext);
          deviceList.map((item) => new DeviceNode(item as DeviceItem));
        } catch (err) {
          vscode.window.showErrorMessage("Failed to launch Send D2C Messages webview: " + err.message);
          this.telemetry(Constants.SimulatorLaunchEvent, false, {
            error: "Failed to launch Send D2C Messages webview: " + err.message,
          });
          return;
        }
        const hostName = ConnectionString.parse(this.iotHubConnectionString)
          .HostName;
        const hostNamePersisted = this.persistedInputs.hostName;
        const deviceConnectionStringsPersisted = this.persistedInputs
          .deviceConnectionStrings;
        await this.showWebview(
          hostName !== hostNamePersisted ||
            deviceConnectionStringsPersisted.length !== 0,
          hostName,
          deviceConnectionStrings,
        );
        this.telemetry(Constants.SimulatorLaunchEvent, true);
      }
      vscode.commands.executeCommand("azure-iot-toolkit.refresh");
    }
  }