I have GC functions which I develop and test locally by using Cloud Pub/Sub emulator.
I want to be able to check from within Go code if Cloud Pub/Sub emulator is up and running. If not, I would like to inform a developer that he/she should start emulator before he/she execute code locally.
When the emulator starts I noticed a line
INFO: Server started, listening on 8085
Maybe I can check if port is available or similar.
I guess you have used this command:
gcloud beta emulators pubsub start
And you got the following output:
[pubsub] This is the Google Pub/Sub fake.
[pubsub] Implementation may be incomplete or differ from the real system.
[pubsub]
[pubsub] INFO: IAM integration is disabled. IAM policy methods and ACL checks are not supported
[pubsub]
[pubsub] INFO: Applied Java 7 long hostname workaround.
[pubsub]
[pubsub] INFO: Server started, listening on 8085
If you take a look at the second INFO message you'll notice that the process name will be JAVA. Now you can run this command:
sudo lsof -i -P -n
Getting all the listening ports and applications, the output should be something like this:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
XXXX
XXXX
java XXX XXX XX IPv4 XXX 0t0 TCP 127.0.0.1:8085 (LISTEN)
Alternatively you can modify the previous command to show only what is happening on the desired port:
sudo lsof -i -P -n | grep 8085