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‎README.md

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# Python LabThings (for Flask)
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[![LabThings](https://img.shields.io/badge/-LabThings-8E00FF?style=flat&logo=data:image/svg+xml;base64,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)](https://github.com/labthings/)
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[![ReadTheDocs](https://readthedocs.org/projects/python-labthings/badge/?version=latest&style=flat)](https://python-labthings.readthedocs.io/en/latest/)
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[![PyPI](https://img.shields.io/pypi/v/labthings)](https://pypi.org/project/labthings/)
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[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
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[![codecov](https://codecov.io/gh/labthings/python-labthings/branch/master/graph/badge.svg)](https://codecov.io/gh/labthings/python-labthings)
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[![Riot.im](https://img.shields.io/badge/chat-on%20riot.im-368BD6)](https://riot.im/app/#/room/#labthings:matrix.org)
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A thread-based Python implementation of the LabThings API structure, based on the Flask microframework.
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## Installation
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`pip install labthings`
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## Quickstart example
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This example assumes a `PretendSpectrometer` class, which already has `data` and `integration_time` attributes, as well as an `average_data(n)` method. LabThings allows you to easily convert this existing instrument control code into a fully documented, standardised web API complete with auto-discovery and automatic background task threading.
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```python
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#!/usr/bin/env python
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import time
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from labthings import ActionView, PropertyView, create_app, fields, find_component, op
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from labthings.example_components import PretendSpectrometer
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from labthings.json import encode_json
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"""
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Class for our lab component functionality. This could include serial communication,
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equipment API calls, network requests, or a "virtual" device as seen here.
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"""
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"""
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Create a view to view and change our integration_time value,
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and register is as a Thing property
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"""
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# Wrap in a semantic annotation to autmatically set schema and args
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class DenoiseProperty(PropertyView):
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"""Value of integration_time"""
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schema = fields.Int(required=True, minimum=100, maximum=500)
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semtype = "LevelProperty"
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@op.readproperty
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def get(self):
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# When a GET request is made, we'll find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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return my_component.integration_time
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@op.writeproperty
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def put(self, new_property_value):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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# Apply the new value
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my_component.integration_time = new_property_value
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return my_component.integration_time
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@op.observeproperty
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def websocket(self, ws):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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initial_value = None
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while not ws.closed:
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time.sleep(1)
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if my_component.integration_time != initial_value:
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ws.send(encode_json(my_component.integration_time))
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initial_value = my_component.integration_time
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"""
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Create a view to quickly get some noisy data, and register is as a Thing property
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"""
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class QuickDataProperty(PropertyView):
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"""Show the current data value"""
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# Marshal the response as a list of floats
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schema = fields.List(fields.Float())
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@op.readproperty
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def get(self):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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return my_component.data
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@op.observeproperty
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def websocket(self, ws):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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while not ws.closed:
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ws.send(encode_json(my_component.data))
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"""
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Create a view to start an averaged measurement, and register is as a Thing action
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"""
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class MeasurementAction(ActionView):
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# Expect JSON parameters in the request body.
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# Pass to post function as dictionary argument.
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args = {
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"averages": fields.Integer(
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missing=20, example=20, description="Number of data sets to average over",
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)
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}
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# Marshal the response as a list of numbers
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schema = fields.List(fields.Number)
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# Main function to handle POST requests
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@op.invokeaction
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def post(self, args):
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"""Start an averaged measurement"""
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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# Get arguments and start a background task
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n_averages = args.get("averages")
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# Return the task information
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return my_component.average_data(n_averages)
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# Create LabThings Flask app
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app, labthing = create_app(
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__name__,
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title="My Lab Device API",
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description="Test LabThing-based API",
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version="0.1.0",
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)
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# Attach an instance of our component
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# Usually a Python object controlling some piece of hardware
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my_spectrometer = PretendSpectrometer()
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labthing.add_component(my_spectrometer, "org.labthings.example.mycomponent")
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# Add routes for the API views we created
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labthing.add_view(DenoiseProperty, "/integration_time")
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labthing.add_view(QuickDataProperty, "/quick-data")
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labthing.add_view(MeasurementAction, "/actions/measure")
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# Start the app
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if __name__ == "__main__":
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from labthings import Server
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Server(app).run()
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```
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## Acknowledgements
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Much of the code surrounding default response formatting has been liberally taken from [Flask-RESTful](https://github.com/flask-restful/flask-restful). The integrated [Marshmallow](https://github.com/marshmallow-code/marshmallow) support was inspired by [Flask-Marshmallow](https://github.com/marshmallow-code/flask-marshmallow) and [Flask-ApiSpec](https://github.com/jmcarp/flask-apispec).
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## Developer notes
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### Changelog generation
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* `npm install -g conventional-changelog-cli`
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* `conventional-changelog -r 1 --config ./changelog.config.js -i CHANGELOG.md -s`
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# Python LabThings (for Flask)
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[![LabThings](https://img.shields.io/badge/-LabThings-8E00FF?style=flat&logo=data:image/svg+xml;base64,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)](https://github.com/labthings/)
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[![ReadTheDocs](https://readthedocs.org/projects/python-labthings/badge/?version=latest&style=flat)](https://python-labthings.readthedocs.io/en/latest/)
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[![PyPI](https://img.shields.io/pypi/v/labthings)](https://pypi.org/project/labthings/)
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[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
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[![codecov](https://codecov.io/gh/labthings/python-labthings/branch/master/graph/badge.svg)](https://codecov.io/gh/labthings/python-labthings)
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[![Riot.im](https://img.shields.io/badge/chat-on%20riot.im-368BD6)](https://riot.im/app/#/room/#labthings:matrix.org)
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A thread-based Python implementation of the LabThings API structure, based on the Flask microframework.
11+
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## Installation
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`pip install labthings`
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## Quickstart example
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18+
This example assumes a `PretendSpectrometer` class, which already has `data` and `integration_time` attributes, as well as an `average_data(n)` method. LabThings allows you to easily convert this existing instrument control code into a fully documented, standardised web API complete with auto-discovery and automatic background task threading.
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```python
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#!/usr/bin/env python
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import time
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from labthings import ActionView, PropertyView, create_app, fields, find_component, op
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from labthings.example_components import PretendSpectrometer
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from labthings.json import encode_json
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"""
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Class for our lab component functionality. This could include serial communication,
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equipment API calls, network requests, or a "virtual" device as seen here.
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"""
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33+
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"""
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Create a view to view and change our integration_time value,
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and register is as a Thing property
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"""
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# Wrap in a semantic annotation to autmatically set schema and args
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class DenoiseProperty(PropertyView):
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"""Value of integration_time"""
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schema = fields.Int(required=True, minimum=100, maximum=500)
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semtype = "LevelProperty"
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@op.readproperty
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def get(self):
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# When a GET request is made, we'll find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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return my_component.integration_time
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@op.writeproperty
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def put(self, new_property_value):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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# Apply the new value
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my_component.integration_time = new_property_value
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return my_component.integration_time
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"""
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Create a view to quickly get some noisy data, and register is as a Thing property
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"""
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class QuickDataProperty(PropertyView):
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"""Show the current data value"""
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# Marshal the response as a list of floats
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schema = fields.List(fields.Float())
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@op.readproperty
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def get(self):
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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return my_component.data
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"""
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Create a view to start an averaged measurement, and register is as a Thing action
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"""
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class MeasurementAction(ActionView):
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# Expect JSON parameters in the request body.
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# Pass to post function as dictionary argument.
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args = {
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"averages": fields.Integer(
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missing=20, example=20, description="Number of data sets to average over",
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)
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}
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# Marshal the response as a list of numbers
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schema = fields.List(fields.Number)
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# Main function to handle POST requests
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@op.invokeaction
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def post(self, args):
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"""Start an averaged measurement"""
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# Find our attached component
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my_component = find_component("org.labthings.example.mycomponent")
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# Get arguments and start a background task
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n_averages = args.get("averages")
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# Return the task information
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return my_component.average_data(n_averages)
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# Create LabThings Flask app
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app, labthing = create_app(
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__name__,
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title="My Lab Device API",
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description="Test LabThing-based API",
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version="0.1.0",
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)
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# Attach an instance of our component
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# Usually a Python object controlling some piece of hardware
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my_spectrometer = PretendSpectrometer()
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labthing.add_component(my_spectrometer, "org.labthings.example.mycomponent")
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# Add routes for the API views we created
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labthing.add_view(DenoiseProperty, "/integration_time")
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labthing.add_view(QuickDataProperty, "/quick-data")
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labthing.add_view(MeasurementAction, "/actions/measure")
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# Start the app
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if __name__ == "__main__":
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from labthings import Server
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Server(app).run()
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```
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## Acknowledgements
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Much of the code surrounding default response formatting has been liberally taken from [Flask-RESTful](https://github.com/flask-restful/flask-restful). The integrated [Marshmallow](https://github.com/marshmallow-code/marshmallow) support was inspired by [Flask-Marshmallow](https://github.com/marshmallow-code/flask-marshmallow) and [Flask-ApiSpec](https://github.com/jmcarp/flask-apispec).
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## Developer notes
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### Changelog generation
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* `npm install -g conventional-changelog-cli`
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* `conventional-changelog -r 1 --config ./changelog.config.js -i CHANGELOG.md -s`

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