How to use gcloud beta pubsub topics publish with pubsub emulator

[Atali Daoud]

Hello,

I try to use "gcloud pubsub topics publish" with my pubsub emulator

• I started the emulator :
  

gcloud beta emulators pubsub start

• I run my pubsub server in go

 go run ./command.go

Registering topic:  COMMAND.SELLER.CREATE

topic ->  SUBSCRIPTION.COMMAND.SELLER.CREATE

Check if topic  COMMAND.SELLER.CREATE  exists ...

Created Subscription: projects/fake-project/subscriptions/SUBSCRIPTION.COMMAND.SELLER.CREATE

• Set the env pubsub in the terminal where I will send the command

$(gcloud beta emulators pubsub env-init)

• Then I push a message through gcloud command 

gcloud beta pubsub topics publish "COMMAND.SELLER.CREATE" "Hello world"

messageIds: '135130600180541'

I got an answer but the Id is coming from the real pubsub and not the emulator. 

Something missing ? Any suggestions will be appreciated .

[Alex Mordkovich]

Hi Atali, can you check the value of the PUBSUB_EMULATOR_HOST environment variable? That is, what is the output of:

echo $PUBSUB_EMULATOR_HOST

? Also, what makes you beliee that the answer is coming from the real pubsub and not the emulator?

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[Atali Daoud]

Hello Alex,

When I as

This is my golang program running with a correct PUBSUB_EMULATOR_HOST

When I run the gcloud command, this is the result . As you can see, gcloud command doesn't see the topic "COMMAND.SELLER.CREATE"

Listing of topics and subscription through gcloud command

I think the gcloud command doesn't take into account the PUBSUB_EMULATOR_HOST variable.

When I stop the emulator, I stop my golang program and unset PUBSUB_EMULATOR_HOST variable in all terminal, it works :

Gcloud command :

and the message is consumed by my golang program

[Alex Mordkovich]

Hi Atali,

Upon a closer read of the instructions at https://cloud.google.com/pubsub/docs/emulator, I see that it says "after following these instructions, the Google Cloud Pub/Sub client libraries in your code call the API running in the local instance instead of the production API." That is, it does not affect the endpoint that 'gcloud beta pubsub' talks to. Could you please file a feature request per https://cloud.google.com/pubsub/docs/support to add support for pointing the gcloud CLI at the local emulator?

Thanks,

Alex

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[Atali Daoud]

Hello Alex,

Ok thanks I will create a feature request as suggested.

think big

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