Node.js Service Details

You can only inspect the details of Node.js services of the node instance the used Bridge is running on. If you have aggregated multiple node instances into a Bridge domain, you need to use the Bridge of the specific node instance the Node.js service is running on.

All users may view details of a Node.js service. Expand the tree below a node instance in the Node Instances section of the navigation on the left. Then, navigate to a Node.js service entry below the sub-navigation item Node.js. The tab Node.js Service is initially displayed.

Figure: Node.js Service Details

Status Information

In the Status section, the status of the node.js service (Running or Stopped) is displayed. Here you can start, stop, delete, or kill the service.

• Stopping the service
  Bridge 7.2.0 Clicking Stop will send  SIGTERM to the service.
  Older Bridges called Java Process.destroy().
• Killing the service
  Bridge 7.2.0 The Kill functionality will first try to regularly stop the service. When the service is still running after 10 seconds, it will forcibly terminate the service with Java Process.destroyForcibly().

If the service is up and running, you can see the system process id (PID) of the service. To match the PID with the Bridge service, you can also use system commands:

ps -efa | grep -- --instance

...  15228  ...  /opt/e2e_bridge_prog/nodejs-8.11.4/linux-64/node index.js --instance /opt/e2e_bridge_data/nodejs_NodeService
...  15265  ...  /opt/e2e_bridge_prog/nodejs-8.11.4/linux-64/node app.js --instance /opt/e2e_bridge_data/nodejs_api-test-helloworld_43
...  15853  ...  /opt/e2e_bridge_prog/j2re-11.0.2/linux-64/bin/java -jar repository.jar --instance /opt/e2e_bridge_data/java_helloworld

wmic process where "caption='bridgeserver.exe' or caption='node.exe' or caption='java.exe'" get processid,caption,commandLine /format:csv| findstr /C:--instance

...,bridgeserver.exe,"C:\E2E_BRIDGE_PROG\bridgeserver-2018.12\win32-64\bridgeserver.exe"  --config "C:\var\E2E_BRIDGE_DATA\server.cfg" --instance "C:\var\E2E_BRIDGE_DATA\bridge_SoapWait",17600
...,node.exe,C:\E2E_BRIDGE_PROG\nodejs-8.11.4\win32-64\node app.js "--instance C:\var\E2E_BRIDGE_DATA\nodejs_api-test-helloworld",20144

Npm Install

A Node.js service can have dependencies to other packages. Click Run to execute npm install to refresh dependent packages.
As per default, this 'npm install' does not run installer scripts. Check run scripts, if you want to execute npm installer scripts, but be aware of the fact that running scripts is a security vulnerability.
To inspect the logs of the 'npm install' command, switch to the deployed service and go to tab Logging (see also Logging of Node.js Services).

To execute npm install, the service has to be stopped. Otherwise, Run will be disabled.

Service Details

In the Details section, the following information is displayed:

Preferences

In the Preferences section, the following preferences can be modified:

Option	Description
Automatic Startup	Select this option, if you want the service to startup automatically, whenever the Bridge is started.  Only users who are member of a group, to which the role ADMIN has been assigned, are allowed to change this option. This option can be globally disabled by the Disable Automatic Service Startup option on the node instance preferences. When updating the BRIDGE, all deployed services (xUML, Node.js, and Java services) will be kept. However, the automatic startup option will be ignored on the very first start-up after the update.
Automatic Restart	Whenever the service crashes, it will restart immediately. Nevertheless, in the navigation the icon  next to the xUML service name will indicate the abnormal termination. Also consider the implications of Minimum Uptime in Seconds when setting this option.
Minimum Uptime in Seconds	To allow the Bridge to distinct whether the service has crashed during start-up or not, specify the minimum uptime of the Node.js service in seconds. Implications: If the service crashes during the uptime period, the Bridge will assume that the service could not be started. No Automatic Restart will be applied. If the service crashes after the uptime period, the Bridge will assume a crash. If option Automatic Restart is set, the Bridge will try to restart the service.
UI URL	Specify the URL of the user interface of the Node.js service. It then will be displayed as an additional tab within the Bridge and you can access it directly via the Bridge.
UI Tab Title	If the Node.js service has a user interface that is integrated to the Bridge, you can specify the title of the tab here. The default title is User Interface.
Owner	The group id of the user who has deployed the service. Only users who are member of a group, to which the role ADMIN has been assigned, are allowed to modify the owner of the service.

Environment Variables

Each Node.js service runs with a specific set of environment variables which is provided by the operating system. They can be added and changed on tab Environment Variables (see Setting Environment Variables for Node.js Services). Additionally, the Bridge provides environment variables that are strongly recommended to be used by developers in their code (see Developing Node.js Services):

These special environment variables are listed on the service details tab.

History

Switch to the History tab to view the history of all user actions that were executed on the selected Node.js service since its deployment.

In the Node.js service history all user actions are listed - comprising starting and stopping the service, modification of the preferences, etc. The list is sorted in a chronological order and also shows the user who initiated the action.
The history also lists internal actions, for instance, when the system started or stopped a Node.js service automatically.

All users have access to the history information.

Figure: Node.js Service History