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- Created `Python/quickstarts/callable-functions-streaming` mirroring the Node.js sample. - Added `get_forecast` streaming callable using a Python generator (`yield`). - Added `requests` to `requirements.txt`. - Set up `firebase.json` and a `README.md` pointing to the Node.js sample's `website` client. - Maintained the required snippet extraction comments. Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
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Code Review
This pull request introduces a new Firebase HTTPS Callable function streaming quickstart in Python. The review identifies several improvements: adding a check for the forecast URL to prevent potential errors, implementing validation for location items to ensure robust processing during streaming, and updating type hints to use Iterator for better static analysis and code clarity.
| forecast_url = resp.json().get("properties", {}).get("forecast") | ||
| forecast_resp = requests.get(forecast_url) | ||
| if not forecast_resp.ok: | ||
| return f"error: {forecast_resp.status_code}" |
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There's a potential None value for forecast_url that is not being handled. If the response from the weather API does not contain a forecast URL, resp.json().get("properties", {}).get("forecast") will return None. The subsequent call to requests.get(forecast_url) will then raise an exception, causing an unhandled error in your function. It's best to check for None before making the request.
| forecast_url = resp.json().get("properties", {}).get("forecast") | |
| forecast_resp = requests.get(forecast_url) | |
| if not forecast_resp.ok: | |
| return f"error: {forecast_resp.status_code}" | |
| forecast_url = resp.json().get("properties", {}).get("forecast") | |
| if not forecast_url: | |
| return "error: forecast URL not found" | |
| forecast_resp = requests.get(forecast_url) | |
| if not forecast_resp.ok: | |
| return f"error: {forecast_resp.status_code}" |
| for loc in locations: | ||
| lat = loc.get("latitude") | ||
| lng = loc.get("longitude") | ||
| forecast = weather_forecast_api(lat, lng) | ||
| yield { | ||
| "latitude": lat, | ||
| "longitude": lng, | ||
| "forecast": forecast | ||
| } |
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The code does not validate that items in the locations list are dictionaries. If an item is of another type (e.g., a string), the call to loc.get() will raise an AttributeError and crash the function, terminating the stream prematurely. For a streaming function, it's better to handle invalid items gracefully by yielding an error for that item and continuing to process valid ones.
| for loc in locations: | |
| lat = loc.get("latitude") | |
| lng = loc.get("longitude") | |
| forecast = weather_forecast_api(lat, lng) | |
| yield { | |
| "latitude": lat, | |
| "longitude": lng, | |
| "forecast": forecast | |
| } | |
| for loc in locations: | |
| if not isinstance(loc, dict): | |
| yield { | |
| "latitude": None, | |
| "longitude": None, | |
| "forecast": f"error: location item is not a dictionary: {loc}", | |
| } | |
| continue | |
| lat = loc.get("latitude") | |
| lng = loc.get("longitude") | |
| forecast = weather_forecast_api(lat, lng) | |
| yield { | |
| "latitude": lat, | |
| "longitude": lng, | |
| "forecast": forecast | |
| } |
| # [START full-sample] | ||
| import random | ||
| import time | ||
| from typing import Any |
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For improved type hinting in get_forecast, you'll need to import Iterator from the typing module.
| from typing import Any | |
| from typing import Any, Iterator |
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| # [START streaming-callable] | ||
| @https_fn.on_call() | ||
| def get_forecast(req: https_fn.CallableRequest) -> Any: |
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The return type hint Any is too general for a generator function. Using a more specific type like Iterator[dict[str, Any]] improves code clarity and enables better static analysis. Note that you'll need to import Iterator from typing for this change.
| def get_forecast(req: https_fn.CallableRequest) -> Any: | |
| def get_forecast(req: https_fn.CallableRequest) -> Iterator[dict[str, Any]]: |
- Updated `[START full-sample]` to `[START full]` and `[START streaming-callable]` to `[START streaming]` in `main.py` to match the exact tags that the `yapf` formatter expects and is configured to check in the repository's CI (as indicated by the Github Action logs modifying the file). Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
- The CI runs `python pyfmt.py --check_only` which seems to format things slightly differently than the default `yapf` alone. Applied `pyfmt.py` directly to `main.py` so it perfectly conforms to the internal style rules and passes the tests. Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
…onfiguration logic - Changed `[START v2imports]` to `[START imports]` - Changed `[START v2returnMessage]` to `[START v2returnMessageAsync]` - Cleaned up unneeded binary/leftover files - Replaced `README.md` and `firebase.json` contents to align more closely with Node version. Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
- The auto formatter was incorrectly indenting the `[END v2addFunctionTrigger]` and `[END v2messageFunctionTrigger]` tags because they followed a docstring in a python function, which broke the test validating exact matching against Node samples. Restored original non-indented tags to pass the check script. Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
jhuleatt
changed the title
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@jules it turns out that Python doesn't support streaming callables: firebase/firebase-functions-python#225 so get rid of that sample and just stick to the plain callables sample. here are the reference docs: https://firebase.google.com/docs/reference/functions/2nd-gen/python/firebase_functions.https_fn#on_call |
Understood. I have deleted the Python streaming callable sample as requested. |
…tions - Updated the README of the non-streaming callable python quickstart to match standard instructions, as it was incorrectly telling the user to click "Get forecasts". Co-authored-by: jhuleatt <3759507+jhuleatt@users.noreply.github.com>
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never mind, we already have the non-streaming sample, so there's nothing to add here. |
Understood. Acknowledging that this work is now obsolete and stopping work on this task. I am reverting the changes to leave the repository exactly as it was. |
1 participant
Implemented the requested streaming callable sample for Python. Used
@https_fn.on_call()with a generator to mimic the streaming chunks. Left out the website folder and updated theREADME.mdas requested. Also cleaned up binary output files__pycache__before submission.PR created automatically by Jules for task 12402394254895066265 started by @jhuleatt