FunctionApp not importing python module

I’ve spent days trying to deploy a function app using Terraform. It makes use of the requests python module.

I’ve narrowed the problem down to Azure not importing python modules in the requirements.txt. file.

To test, I created a simple httptrigger function app that simply returns a url parameter. My deployment script zips the directories and deploys the app using terraform. All is well and everything works as expected.

But, if change my python script (__init__.py) to import the python modules “urllib3” and/or “requests,” The function fails, even though the simple python script doesn’t actually use any methods or classes from the modules. There are no errors when deploying the function. It fails when called from the url.

I verified that the modules are listed in the requirements.txt file.

And just to be sure, if I comment out the import requests and urllib3, everything works.

Any advice or suggestions would be greatly appreciated.

Simple test script (__init__.py):

import logging
import azure.functions as func
# function fails with the following line.  Works if commented out.
import urllib3



def main(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

    target = req.params.get('target')
    if target:
        return func.HttpResponse("Pretending to use " + target, status_code = 503)
    else:
        return func.HttpResponse("No Taget Specified", status_code = 400)

requirements.txt (Updated 7/15)

azure-functions==1.2.1
future==0.18.2
pefile==2019.4.18
PyInstaller==3.6
pylint==2.5.3
pywin32-ctypes==0.2.0
PyYAML==5.3.1
urllib3==1.25.9
requests==2.24.1

Update 7/16: Terraform file:

variable "prefix" {
    type = "string"
    default = "jis"
}

variable "location" {
    type = "string"
    default = "eastus"
}

variable "environment" {
    type = "string"
    default = "dev"
}

variable "functionapp" {
    type = "string"
    default = "./testit.zip"
}

resource "random_string" "storage_name" {
    length = 24
    upper = false
    lower = true
    number = true
    special = false
}

provider "azurerm" {
  version = "~>2.1.0"
  features {}
}

# Create Storage Account

resource "azurerm_resource_group" "rg" {
    name = "${var.prefix}-${var.environment}"
    location = "${var.location}"
}

resource "azurerm_storage_account" "storage" {
    name = "${random_string.storage_name.result}"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    location = "${var.location}"
    account_tier = "Standard"
    account_replication_type = "LRS"
}

resource "azurerm_storage_container" "deployments" {
    name = "function-releases"
    storage_account_name = "${azurerm_storage_account.storage.name}"
    container_access_type = "private"
}

# upload zip file

resource "azurerm_storage_blob" "appcode" {
    name = "functionapp.zip"
    storage_account_name = "${azurerm_storage_account.storage.name}"
    storage_container_name = "${azurerm_storage_container.deployments.name}"
    type = "Block"
    source = "${var.functionapp}"
}

# Create function app

data "azurerm_storage_account_sas" "sas" {
    connection_string = "${azurerm_storage_account.storage.primary_connection_string}"
    https_only = true
    start = "2020-07-10"
    expiry = "2023-12-31"
    resource_types {
        object = true
        container = false
        service = false
    }
    services {
        blob = true
        queue = false
        table = false
        file = false
    }
    permissions {
        read = true
        write = false
        delete = false
        list = false
        add = false
        create = false
        update = false
        process = false
    }
}

resource "azurerm_app_service_plan" "asp" {
    name = "${var.prefix}-plan"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    location = "${var.location}"
    kind = "Linux"
    reserved = true
    sku {
        tier = "Dynamic"
        size = "Y1"
    }
}

resource "azurerm_function_app" "functions" {
    name = "${var.prefix}-${var.environment}"
    location = "${var.location}"
    resource_group_name = "${azurerm_resource_group.rg.name}"
    app_service_plan_id = "${azurerm_app_service_plan.asp.id}"
    storage_connection_string = "${azurerm_storage_account.storage.primary_connection_string}"
    version = "~2"

    app_settings = {
        https_only = true
        FUNCTIONS_WORKER_RUNTIME = "python"
        WEBSITE_NODE_DEFAULT_VERSION = "~10"
        FUNCTION_APP_EDIT_MODE = "readonly"
        HASH = "${base64encode(filesha256("${var.functionapp}"))}"
        WEBSITE_RUN_FROM_PACKAGE = "https://${azurerm_storage_account.storage.name}.blob.core.windows.net/${azurerm_storage_container.deployments.name}/${azurerm_storage_blob.appcode.name}${data.azurerm_storage_account_sas.sas.sas}"
    }
}

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