Error: error getting topics from app - unexpected end of JSON input - error occurred while beginning pubsub messages

[tpmccallum]

Hi,

I am performing the grayscale tutorial example i.e. make run-api-rs the following error is occurring.

ERRO[0000] error getting topics from app: unexpected end of JSON input  app_id=image-api-rs instance=wasm-oci-demo scope=dapr.runtime type=log ver=1.4.2
ERRO[0000] error occurred while beginning pubsub messages: error getting topics from app: unexpected end of JSON input  app_id=image-api-rs instance=wasm-oci-demo scope=dapr.runtime type=log ver=1.4.2
INFO[0000] dapr initialized. Status: Running. Init Elapsed 9.416037000000001ms  app_id=image-api-rs instance=wasm-oci-demo scope=dapr.runtime type=log ver=1.4.2

The following video (which starts just as the error occurs) demonstrates the above error in action.

https://youtu.be/A5EhO7cNTCw?t=392

It seems that dapr list is displaying the correct output (in terms of apps, ports etc.)

wasmedge@wasm-oci-demo:~$ dapr list
  APP ID        HTTP PORT  GRPC PORT  APP PORT  COMMAND               AGE  CREATED              PID     
  go-web-port   3500       40659      8080      ./web-port            36s  2021-10-05 02:38.25  334410  
  image-api-rs  3502       34493      9004      ./target/debug/im...  23s  2021-10-05 02:38.38  334530  
  image-api-go  3501       40639      9003      ./image-api-go        9s   2021-10-05 02:38.52  334658 

Is it possible that the grayscale needs to be added to the config i.e. https://github.com/second-state/dapr-wasm/blob/main/config/conf.json

Any suggestions would be greatly appreciated.

Thanks Tim

[chenyukang]

Hi @tpmccallum , thanks for reporting this issue. components is a core concept of Dapr, but we haven't used for this demo-application, such as pubsub, schedule, etc.

So, we'd better remove these unnecessary configurations to avoid messy messages. https://github.com/second-state/dapr-wasm/pull/15 is created for resolving this issue.

[tpmccallum]

Thanks I will give this a try and let you know how it goes. Thanks again. Tim