How to create http_trigger alone in the existing function app, but not the whole function from scratch?

Question

I have created a function app in Azure. Using Visual Studio Code, I created a function in local, and deployed it to existing function app.

The first time I deployed, it was successful.

The second time, however, when I deployed the same function from local to the same existing function app, the http_trigger inside the function app disappeared.

After that, I tried the deployment multiple times, but still the http_trigger is not found.

Why did it get removed on the second deployment? Should I deploy the function only once?

If yes, is there any way to perform the deployment again, in case of any changes in the code inside the function?

I have the script file test_run.py with some code, inside the function in the function_app.py file, I tried to import my script file like below, after making these changes, I tried for deployment when the http_trigger got removed.

function_app.py:

import test_run

"""rest of the default trigger function code"""

if name:
	test_run.main()
	return f"Hello {name}. The function triggered"
else:
	test_run.main()
	return f"Hello. The function triggered without a name"

test_run.py:

def func_1():
   function code
def func_2():
   function code
def func_3():
   function code
def main ():
   try:
       func_1()
       func_2()
       func_3()
   except:
       code for retry

I was also not able to create only the http_trigger inside the function, that option is not available for me in either vs code or in Azure Portal. Also, if I create the new function and function app from scratch, it was deployed the first time successfully. When I do some changes in the script and try to deploy it again, the http_trigger got removed. Please help me to resolve this.

Note: this function will be used in the Azure Data Factory pipeline. That's why used Azure Data Factory tag as well.

Answer 1

@SangeethaP Welcome to Microsoft Q&A Forum, Thank you for posting your query here!

I understand that you are facing an issue while deploying your HTTP Triggered function app with the http trigger missing during second deployment.

• Please confirm if you used the az functionapp deployment source config-zip CLI command to perform the deployment. More info about the Zip deployment through CLI. Did you try with most recent CLI version (2.53.0) ?
• Did you try restarting the function app and check if that makes a difference ?
• Could you please make sure that the d:\home\data\SitePackages (Windows) or /home/data/SitePackages (Linux) folder has a file named packagename.txt ?This file contains only the name, without any whitespace, of the package file in this folder that's currently running.
• Open the d:\home\site\wwwroot (Windows) or /home/site/wwwroot and then navigate to your function app folder and check if your updated code is present here. This step is to isolate that you deployment is done successfully.
• Could you please perform the deployment as mentioned in this document and check if that helps ? If you have tried it already try publishing with func azure functionapp publish command (see here) and check if that makes a difference.

If none of the above action plan helps, please let me know I would be happy to assist you further.

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