Develop Reference

Build a JSON object using for loop with python

I am new to python and trying to write a simple script that pushes notification to my slack channel about open tickets in my queue.
I am trying to submit the below JSON object to a slack webhook but not sure how to achieve the end result that looks like below.
{
"blocks": [
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "There are *2* open tickets :in the queue\n *Ticket Details *"
}
},
{
"type": "divider"
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "*12345* - High CPU usage on prod app1 server"
}
},
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "*54321* - DB parameter modification - ProdDB03"
}
},
{
"type": "divider"
}
]
}
I am doing an API call to an URL that gives me the open ticket details in a JSON format. I am able to parse through it and store the Count (number of open tickets), Ticket ID and the Ticket Description in respective variables.
I would like to create a block for each ticket as below.
{
"type": "section",
"text": {
"type": "mrkdwn",
"text": "*54321* - DB parameter modification - ProdDB03"
}
}
Just ideas on how to achieve this without actual code would be helpful too.
Thanks

Azure function: System.InvalidOperationException: Storage account connection string 'does not exist

I have written an azure function, currently the azure function is acting as Webhook Consumer. The job of the function is to read Webhook events and save into azure storage.
I am using an HTTP trigger template to get the job done. I am able to receive the events from the Webhook, but when I try to write to azure storage it is giving me below error.
I tried the option mentioned in this post, but no luck still getting the same error.
System.InvalidOperationException: Storage account connection string 'AzureWebJobs<AzureStorageAccountName>' does not exist. Make sure that it is a defined App Setting.
Below is my function.json file
{
"scriptFile": "__init__.py",
"bindings": [
{
"authLevel": "anonymous",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"type": "blob",
"name": "outputblob",
"path": "test/demo",
"direction": "out",
"connection": "<AzureStorageAccountName>"
}
]
}
init.py
import logging
import azure.functions as func
def main(req: func.HttpRequest,outputblob: func.Out[str]) -> func.HttpResponse:
logging.info('Python HTTP trigger function processed a request.')
name = 'some_name'
if not name:
try:
req_body = 'req_body_test'#req.get_json()
except ValueError:
pass
else:
name = 'name'#req_body.get('name')
print(str(req.get_json()))
outputblob.set(str(req.get_json()))

Please make sure you have already add the connection string to the local.settings.json on local or configuration settings on azure.
Please test below code and settings files:
__init__.py
import logging
import azure.functions as func
def main(req: func.HttpRequest,outputblob: func.Out[func.InputStream]) -> func.HttpResponse:
outputblob.set("this is a test.")
return func.HttpResponse(
"Test.",
status_code=200
)
function.json
{
"scriptFile": "__init__.py",
"bindings": [
{
"authLevel": "anonymous",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"type": "http",
"direction": "out",
"name": "$return"
},
{
"name": "outputblob",
"type": "blob",
"path": "test/demo",
"connection": "MyStorageConnectionAppSetting",
"direction": "out"
}
]
}
local.settings.json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "",
"FUNCTIONS_WORKER_RUNTIME": "python",
"MyStorageConnectionAppSetting":"DefaultEndpointsProtocol=https;AccountName=0730bowmanwindow;AccountKey=xxxxxx;EndpointSuffix=core.windows.net"
}
}
On azure:

Can i make use of binding expression in azure functions for Python?

I have in binding of httpTrigger and out binding of blob wherein i am creating a blob after processing the request. The blob name i need to evaluate on runtime and use that in my expression. Is there a way to achive that in python?
function.json
{
"scriptFile": "__init__.py",
"bindings": [
{
"authLevel": "anonymous",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"name": "outputblob",
"type": "blob",
"path": "testcntainer/attachments/{customFileName}",
"connection": "",
"direction": "out"
},
{
"name": "$return",
"type": "http",
"direction": "out"
}
]
}

No, it is no possible.
The value of blobname in binding is const.
The right way to acheive what you want is put the logic in the body of your function.
Have a look of this offcial doc:
https://learn.microsoft.com/en-us/azure/storage/blobs/storage-quickstart-blobs-python#upload-blobs-to-a-container
Let me know if you have any adoubts about above link, if that, I will update a simple code.:)

Trying to trigger an url from azure functions using python, errored saying "without a $return binding returned a non-None value"

Below is the code,
import logging
import json
import urllib.request
import urllib.parse
import azure.functions as func
def main(myblob: func.InputStream):
logging.info(f"Python blob trigger function processed blob \n"
f"Name: {myblob.name}\n"
f"Blob Size: {myblob.length} bytes")
response = urllib.request.urlopen("http://example.com:5000/processing")
return {
'statusCode': 200,
'body': json.dumps(response.read().decode('utf-8'))
}
Error: Result: Failure Exception: RuntimeError: function 'abc' without a $return binding returned a non-None value Stack: File "/azure-functions-host/workers/python/3.7/LINUX/X64/azure_functions_worker/dispatcher.py", line 341, in _handle__invocation_request f'function {fi.name!r} without a $return binding '. The same code works in lambda.. Please help me in debugging in azure functions.
function.json
{
"scriptFile": "__init__.py",
"bindings": [
{
"name": "myblob",
"type": "blobTrigger",
"direction": "in",
"path": "sourcemetadata/{name}",
"connection": "AzureWebJobsStorage"
}
]
}

In the Azure function, if you use return in the function app code, it means that you want to use output binding. But you do not define it in function.json. Please define it. For more details, please refer to here and here
For example
I use process blob with blob trigger and send message to azure queue with queue output binding
function.json
{
"scriptFile": "__init__.py",
"bindings": [
{
"name": "myblob",
"type": "blobTrigger",
"direction": "in",
"path": "test/{name}.csv",
"connection": "AzureWebJobsStorage"
},
{
"name": "$return",
"direction": "out",
"type": "queue",
"queueName": "outqueue",
"connection": "AzureWebJobsStorage"
}
]
}
Code
async def main(myblob: func.InputStream) :
logging.info(f"Python blob trigger function processed blob \n"
f"Name: {myblob.name}\n")
return "OK"

azure httptrigger blob storage using Python

I am trying to setup access to blob storage using a python function app but the file name is received from a post request not preset. The http trigger part works but i'm having trouble accessing files in my blob storage. This is my json:
{
"bindings": [
{
"authLevel": "function",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"post",
"get"
]
},
{
"name": "inputblob",
"type": "blob",
"path": "sites/{httpTrigger}",
"connection": "STORAGE",
"direction": "in"
},
{
"type": "http",
"direction": "out",
"name": "res"
}
],
"disabled": false
}
I saw an example (https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob#input---configuration) using a queue trigger but when i do do something similar using http i get 'No value for named parameter 'httpTrigger''. My issue is that i don't know how to reflect a variable that is assigned in my python code in my path. When i do this container/{variable} i get a nullreference exception. This is my python code:
import os
import json
import sys
import logging
import azure.functions as func
_AZURE_FUNCTION_DEFAULT_METHOD = "GET"
_AZURE_FUNCTION_HTTP_INPUT_ENV_NAME = "req"
_AZURE_FUNCTION_HTTP_OUTPUT_ENV_NAME = "res"
_REQ_PREFIX = "REQ_"
def write_http_response(status, response):
output = open(os.environ[_AZURE_FUNCTION_HTTP_OUTPUT_ENV_NAME], 'w')
output.write(json.dumps(response))
env = os.environ
postreqdata = json.loads(open(env['req']).read())
print ('site: ' + postreqdata['site'])
site = postreqdata['site']+'.xlsx'
input_file = open(os.environ['inputBlob'], 'r')
clear_text = input_file.read()
input_file.close()
print("Content in the blob file: '{0}'".format(clear_text))
# Get HTTP METHOD
http_method = env['REQ_METHOD'] if 'REQ_METHOD' in env else
_AZURE_FUNCTION_DEFAULT_METHOD
print("HTTP METHOD => {}".format(http_method))
# Get QUERY STRING
req_url = env['REQ_HEADERS_X-ORIGINAL-URL'] if 'REQ_HEADERS_X-ORIGINAL-URL'
in env else ''
urlparts =req_url.split('?')
query_string = urlparts[1] if len(urlparts) == 2 else ''
print("QUERY STRING => {}".format(query_string))
if http_method.lower() == 'post':
request_body = open(env[_AZURE_FUNCTION_HTTP_INPUT_ENV_NAME], "r").read()
print("REQUEST BODY => {}".format(request_body))
write_http_response(200, site)
note: i have made my connection string successfully ( i think) and i am new to azure and using the portal only

This looks like an older version of function apps. In the new version, you can actually use the request handler to do all this work for you. I just started working in azure functions and if you want to access a file in blob storage, all you have to do is pass in the filename parameters in the form of http query, and use that query param name as the binding variable.
Ex:
def main(req: func.HttpRequest, inputblob: func.InputStream):
input_file_content = input_blob.read()
and in your binding you give
{
"scriptFile": "__init__.py",
"bindings": [
{
"authLevel": "function",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"type": "http",
"direction": "out",
"name": "$return"
},
{
"type": "blob",
"direction":"in",
"name": "inputblob",
"path": "upload/{filename}",
"connection": "AzureWebJobsStorage"
}
]
}
and you simply call the api with the query parameters filename
http://localhost:7071/api/HttpTriggerFileUpload?filename=file.ext
You can take a look at this