[BUG] Unable to query Trigger connection parameters from Keyvault - Azure functions v2 - Linux docker container

Investigative information

Please provide the following:

Timestamp: 2024-02-13T05:33:28.829Z
Function App name: classification-function-app
Function name(s) (as appropriate):
Core Tools version: 4.0.5455

Repro steps

Provide the steps required to reproduce the problem:

I am using the Service Bus trigger for my application. To load the Service Bus trigger connection string, currently, we rely on the Docker environment variable, which is dynamically set when the Azure pipeline is triggered

Code

@app.service_bus_topic_trigger(
    arg_name="azservicebus",
    subscription_name="mysubscription",
    topic_name="mysbtopic",
    connection="ServiceBusConnectionString",
)
def servicebus_topic_trigger(azservicebus: func.ServiceBusMessage):
    logging.info(
        "Python ServiceBus Topic trigger processed a message: %s",
        azservicebus.get_body().decode("utf-8"),
    )

The ServiceBusConnectionString is referred as a Docker environment variable in the Dockerfile as below:

FROM mcr.microsoft.com/azure-functions/python:4-python3.11

ENV AzureWebJobsScriptRoot=/home/site/wwwroot \
    AzureWebJobsFeatureFlags=EnableWorkerIndexing \
    PYTHON_ENABLE_DEBUG_LOGGING=1 \
    FUNCTIONS_WORKER_RUNTIME=python \
    ServiceBusConnectionString=#{MyOrg--ServiceBus--ConnectionString}#

Expected behavior

Provide a description of the expected behavior.

The Service bus trigger connection string should be successfully loaded from Azure Key vault upon function app startup

Actual behavior

Provide a description of the actual behavior observed.

Known workarounds

Provide a description of any known workarounds.

Currently, the connection parameter refers to any variable that holds the connection string. Hence we are hardcoding it as a Docker environment variable
The other alternative is to set it as a Kubernetes environment variable through Azure pipelines
However we want to fetch it from Keyvault

Contents of the requirements.txt file:

Provide the requirements.txt file to help us find out module related issues.

annotated-types==0.6.0
asgiref==3.7.2
azure-common==1.1.28
azure-core-tracing-opentelemetry==1.0.0b11
azure-core==1.30.0
azure-functions==1.18.0
azure-identity==1.15.0
azure-keyvault-secrets==4.7.0
azure-monitor-opentelemetry-exporter==1.0.0b22
azure-monitor-opentelemetry==1.2.0
azure-storage-blob==12.19.0
blis==0.7.11
catalogue==1.0.2
certifi==2024.2.2
cffi==1.16.0
charset-normalizer==3.3.2
cryptography==42.0.2
cymem==2.0.8
dateparser==1.2.0
deprecated==1.2.14
fixedint==0.1.6
idna==3.6
importlib-metadata==6.11.0
isodate==0.6.1
joblib==1.3.2
msal-extensions==1.1.0
msal==1.26.0
msrest==0.7.1
murmurhash==1.0.10
numpy==1.26.4
oauthlib==3.2.2
opentelemetry-api==1.22.0
opentelemetry-instrumentation-asgi==0.43b0
opentelemetry-instrumentation-dbapi==0.43b0
opentelemetry-instrumentation-django==0.43b0
opentelemetry-instrumentation-fastapi==0.43b0
opentelemetry-instrumentation-flask==0.43b0
opentelemetry-instrumentation-psycopg2==0.43b0
opentelemetry-instrumentation-requests==0.43b0
opentelemetry-instrumentation-urllib3==0.43b0
opentelemetry-instrumentation-urllib==0.43b0
opentelemetry-instrumentation-wsgi==0.43b0
opentelemetry-instrumentation==0.43b0
opentelemetry-resource-detector-azure==0.1.3
opentelemetry-sdk==1.22.0
opentelemetry-semantic-conventions==0.43b0
opentelemetry-util-http==0.43b0
orjson==3.9.10
packaging==23.2
pandas==2.2.0
pillow==10.2.0
plac==1.1.3
portalocker==2.8.2
preshed==3.0.9
pycparser==2.21
pydantic-core==2.16.2
pydantic==2.6.1
pyhumps==3.8.0
pyjwt==2.8.0
python-dateutil==2.8.2
python-dotenv==1.0.0
pytz==2024.1
pyyaml==6.0.1
rapidfuzz==3.6.1
regex==2023.12.25
requests-oauthlib==1.3.1
requests==2.31.0
scikit-learn==1.4.0
scipy==1.12.0
six==1.16.0
spacy==2.3.9
srsly==1.0.7
thinc==7.4.6
threadpoolctl==3.2.0
tqdm==4.66.1
typing-extensions==4.9.0
tzdata==2023.4
tzlocal==5.2
urllib3==2.2.0
wasabi==0.10.1
wrapt==1.16.0
zipp==3.17.0

Related information

Provide any related information

Links to source
Bindings used: Service bus trigger

Azure / azure-functions-servicebus-extension

[BUG] Unable to query Trigger connection parameters from Keyvault - Azure functions v2 - Linux docker container #231