103 lines
3.0 KiB
Python
103 lines
3.0 KiB
Python
"""
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General projector code.
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Functions that handel the registration of projector elements and the rendering
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of the data to present it on the projector.
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"""
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from typing import Any, Awaitable, Callable, Dict, List
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from .cache import element_cache
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AllData = Dict[str, Dict[int, Dict[str, Any]]]
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ProjectorSlide = Callable[[AllData, Dict[str, Any], int], Awaitable[Dict[str, Any]]]
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projector_slides: Dict[str, ProjectorSlide] = {}
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class ProjectorElementException(Exception):
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"""
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Exception for errors in one element on the projector.
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"""
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def register_projector_slide(name: str, slide: ProjectorSlide) -> None:
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"""
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Registers a projector slide.
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Has to be called in the app.ready method.
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"""
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projector_slides[name] = slide
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async def get_projector_data(
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projector_ids: List[int] = None,
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) -> Dict[int, List[Dict[str, Any]]]:
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"""
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Calculates and returns the data for one or all projectors.
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The keys of the returned data are the projector ids as int. When converted
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to json, the numbers will changed to strings like "1".
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The data for each projector is a list of elements.
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Each element is a dict where the keys are "elements", "data". "elements"
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contains the projector elements. It is the same as the projector elements in
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the database. "data" contains all necessary data to render the projector
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element. The key can also be "error" if there is a generall error for the
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slide. In this case the values "elements" and "data" are optional.
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The returned value looks like this:
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projector_data = {
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1: [
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{
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"element": {
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"name": "agenda/item-list",
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},
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"data": {
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"items": []
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},
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},
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],
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}
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"""
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if projector_ids is None:
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projector_ids = []
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all_data = await element_cache.get_all_data_dict()
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projector_data: Dict[int, List[Dict[str, Any]]] = {}
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for projector_id, projector in all_data.get("core/projector", {}).items():
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if projector_ids and projector_id not in projector_ids:
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# only render the projector in question.
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continue
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if not projector["elements"]:
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# Skip empty elements.
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continue
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projector_data[projector_id] = []
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for element in projector["elements"]:
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projector_slide = projector_slides[element["name"]]
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try:
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data = await projector_slide(all_data, element, projector_id)
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except ProjectorElementException as err:
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data = {"error": str(err)}
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projector_data[projector_id].append({"data": data, "element": element})
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return projector_data
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async def get_config(all_data: AllData, key: str) -> Any:
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"""
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Returns a config value from all_data.
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"""
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from ..core.config import config
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config_id = (await config.async_get_key_to_id())[key]
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return all_data[config.get_collection_string()][config_id]["value"]
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