/
useEntityTypeFilter.tsx
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/
useEntityTypeFilter.tsx
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/*
* Copyright 2021 The Backstage Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { useEffect, useMemo, useRef, useState } from 'react';
import useAsync from 'react-use/lib/useAsync';
import isEqual from 'lodash/isEqual';
import { useApi } from '@backstage/core-plugin-api';
import { catalogApiRef } from '../api';
import { useEntityListProvider } from './useEntityListProvider';
import { EntityTypeFilter } from '../filters';
type EntityTypeReturn = {
loading: boolean;
error?: Error;
availableTypes: string[];
selectedTypes: string[];
setSelectedTypes: (types: string[]) => void;
};
/**
* A hook built on top of `useEntityListProvider` for enabling selection of valid `spec.type` values
* based on the selected EntityKindFilter.
*/
export function useEntityTypeFilter(): EntityTypeReturn {
const catalogApi = useApi(catalogApiRef);
const {
filters: { kind: kindFilter, type: typeFilter },
queryParameters,
updateFilters,
} = useEntityListProvider();
const [selectedTypes, setSelectedTypes] = useState(
typeFilter?.getTypes() ?? [],
);
// Set selected types on query parameter updates; this happens at initial page load and from
// external updates to the page location.
useEffect(() => {
const queryParamTypes = [queryParameters.type]
.flat()
.filter(Boolean) as string[];
setSelectedTypes(queryParamTypes);
}, [queryParameters]);
const [availableTypes, setAvailableTypes] = useState<string[]>([]);
const kind = useMemo(() => kindFilter?.value, [kindFilter]);
// Load all valid spec.type values straight from the catalogApi, paying attention to only the
// kind filter for a complete list.
const {
error,
loading,
value: entities,
} = useAsync(async () => {
if (kind) {
const items = await catalogApi
.getEntities({
filter: { kind },
fields: ['spec.type'],
})
.then(response => response.items);
return items;
}
return [];
}, [kind, catalogApi]);
const entitiesRef = useRef(entities);
useEffect(() => {
const oldEntities = entitiesRef.current;
entitiesRef.current = entities;
// Delay processing hook until kind and entity load updates have settled to generate list of types;
// This prevents reseting the type filter due to saved type value from query params not matching the
// empty set of type values while values are still being loaded; also only run this hook on changes
// to entities
if (loading || !kind || oldEntities === entities) {
return;
}
// Resolve the unique set of types from returned entities; could be optimized by a new endpoint
// in the catalog-backend that does this, rather than loading entities with redundant types.
if (!entities) return;
// Sort by entity count descending, so the most common types appear on top
const countByType = entities.reduce((acc, entity) => {
if (typeof entity.spec?.type !== 'string') return acc;
const entityType = entity.spec.type.toLocaleLowerCase('en-US');
if (!acc[entityType]) {
acc[entityType] = 0;
}
acc[entityType] += 1;
return acc;
}, {} as Record<string, number>);
const newTypes = Object.entries(countByType)
.sort(([, count1], [, count2]) => count2 - count1)
.map(([type]) => type);
setAvailableTypes(newTypes);
// Update type filter to only valid values when the list of available types has changed
const stillValidTypes = selectedTypes.filter(value =>
newTypes.includes(value),
);
if (!isEqual(selectedTypes, stillValidTypes)) {
setSelectedTypes(stillValidTypes);
}
}, [loading, kind, selectedTypes, setSelectedTypes, entities]);
useEffect(() => {
updateFilters({
type: selectedTypes.length
? new EntityTypeFilter(selectedTypes)
: undefined,
});
}, [selectedTypes, updateFilters]);
return {
loading,
error,
availableTypes,
selectedTypes,
setSelectedTypes,
};
}