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49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
---
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title: "Checklist for creating a component"
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---
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A checklist of things to do when you're adding a new component.
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> Not all existing platforms follow the requirements in this checklist. This cannot be used as a reason to not follow them!
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### 0. Common
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1. Follow our [Style guidelines](development_guidelines.md)
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2. Use existing constants from [`const.py`](https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/const.py)
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* Only add new constants to `const.py` if they are widely used. Otherwise keep them on components level
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### 1. Requirements
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1. Requirement version pinned: `REQUIREMENTS = ['phue==0.8.1']`
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2. We no longer want requirements hosted on GitHub. Please upload to PyPi.
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3. Requirements should only be imported inside functions. This is necessary because requirements are installed on the fly.
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### 2. Configuration
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1. Voluptuous schema present for [configuration validation](development_validation.md)
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2. Default parameters specified in voluptuous schema, not in `setup(…)`
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3. Schema using as many generic config keys as possible from `homeassistant.const`
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4. If your component has platforms, define a `PLATFORM_SCHEMA` instead of a `CONFIG_SCHEMA`.
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5. If using a `PLATFORM_SCHEMA` to be used with `EntityComponent`, import base from `homeassistant.helpers.config_validation`
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6. Never depend on users adding things to `customize` to configure behavior inside your component.
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### 3. Component/platform communication
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1. If you need to share global data with platforms, use the dictionary `hass.data`. `hass.data[DATA_XY]` while `XY` is the component is preferred over `hass.data[DOMAIN]`.
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2. If the component fetches data that causes its related platform entities to update, you can notify them using the dispatcher code in `homeassistant.helpers.dispatcher`.
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### 4. Communication with devices/services
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1. All API specific code has to be part of a third party library hosted on PyPi. Home Assistant should only interact with objects and not make direct calls to the API.
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```python
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# bad
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status = requests.get(url('/status'))
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# good
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from phue import Bridge
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bridge = Bridge(...)
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status = bridge.status()
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```
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