94 lines
2.4 KiB
TypeScript
94 lines
2.4 KiB
TypeScript
import _ from 'lodash';
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const DBDEFINITION = '--db-definition--';
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const dbDefinition = {
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_id: DBDEFINITION,
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type: DBDEFINITION,
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version: '0.000001',
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};
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export const initDb = async (db: any, setDbReady: any) => {
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try {
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await db.get(DBDEFINITION);
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// TODO: support migrations
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} catch (error: any) {
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if (error.status !== 404) {
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console.log(
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`Unexpected error fetching db definition: ${JSON.stringify(error)}`
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);
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return;
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}
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}
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// WARNING: defs must use the canonical form and be identical to what will be returned by db.getIndexes
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const requiredIndexes: any = [
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{
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name: 'type-subtype',
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def: {
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fields: [{ type: 'asc' }, { subtype: 'asc' }],
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},
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},
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{
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name: 'type-trkpt-gpx-time',
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def: {
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fields: [{ type: 'asc' }, { gpx: 'asc' }, { 'trkpt.time': 'asc' }],
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},
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},
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];
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const existingIndexes = (await db.getIndexes()).indexes;
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const pruneIndex = ({ name, def }: any) => ({ name, def });
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const isSameIndex = (idx1: any, idx2: any) => {
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return _.isEqual(pruneIndex(idx1), pruneIndex(idx2));
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};
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const findIndex = (targetIndexes: any, index: any) =>
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targetIndexes.find((targetIndex: any) => {
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return isSameIndex(targetIndex, index);
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});
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for (var index of existingIndexes) {
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if (index.type === 'json') {
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// Non system indexes
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console.log(`Checking existing index :${JSON.stringify(index)}`);
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if (!findIndex(requiredIndexes, index)) {
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console.log(`db.deleteIndex(${JSON.stringify(index)})`);
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await db.deleteIndex(index);
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}
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}
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}
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for (var index of requiredIndexes) {
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if (!findIndex(existingIndexes, index)) {
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console.log(`db.createIndex(${JSON.stringify(index)})`);
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await db.createIndex({ name: index.name, ...index.def });
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}
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}
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setDbReady(true);
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const indexes = await db.getIndexes();
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console.log(`indexes: ${JSON.stringify(indexes)}`);
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const explain1 = await db.explain({
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selector: {
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type: 'trkpt',
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gpx: 'xxxx',
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},
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// sort: ['trkpt.time'],
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// use_index: 'type-trkpt-gpx-time',
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});
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console.log(`explain1: ${JSON.stringify(explain1)}`);
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const explain2 = await db.explain({
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selector: {
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type: 'gpx',
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},
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// sort: ['trkpt.time'],
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// use_index: 'type-trkpt-gpx-time',
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});
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console.log(`explain2: ${JSON.stringify(explain2)}`);
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};
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