b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
72 lines
2.7 KiB
JavaScript
72 lines
2.7 KiB
JavaScript
export class DataStoresIndexedDB {
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constructor(factory, keyRange, uuid) {
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Object.assign(this, { factory, keyRange, uuid });
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}
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open() {
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return (this.database ||= new Promise((resolve, reject) => {
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const request = this.factory.open('vulpes-datastores-v1', 1);
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request.onupgradeneeded = () => {
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request.result.createObjectStore('values');
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request.result.createObjectStore('revisions');
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};
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request.onerror = () => reject(request.error);
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request.onsuccess = () => {
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request.result.onversionchange = () => request.result.close();
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resolve(request.result);
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};
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}));
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}
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async run(key, operation, args) {
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const db = await this.open();
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return new Promise((resolve, reject) => {
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const write = ['add', 'put', 'remove', 'clear'].includes(operation);
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const tx = db.transaction(['values', 'revisions'], write ? 'readwrite' : 'readonly');
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const store = tx.objectStore('values'),
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revisions = tx.objectStore('revisions');
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const range = this.keyRange.bound([key], [key, []]);
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let value,
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revisionId = '',
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entries = [];
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tx.onabort = () => reject(tx.error || new Error('TRANSACTION_ABORTED'));
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tx.onerror = () => {};
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tx.oncomplete = () => resolve({ value, revisionId });
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if (operation === 'get') {
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value = [];
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args.forEach((id, index) => {
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store.get([key, id]).onsuccess = (event) => {
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if (args.length === 1) value = event.target.result;
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else value[index] = event.target.result;
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};
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});
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} else if (operation === 'snapshot') {
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revisions.get(key).onsuccess = (event) => {
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revisionId = event.target.result || '';
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};
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store.openCursor(range).onsuccess = (event) => {
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const cursor = event.target.result;
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if (cursor) {
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entries.push({ id: cursor.key[1], data: cursor.value });
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cursor.continue();
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} else value = { revisionId, entries };
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};
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} else if (operation === 'length') {
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store.count(range).onsuccess = (event) => {
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value = event.target.result;
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};
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} else if (write) {
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revisionId = this.uuid();
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revisions.put(revisionId, key);
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if (operation === 'clear') store.delete(range);
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else if (operation === 'remove') {
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store.count([key, args[0]]).onsuccess = (event) => {
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value = event.target.result > 0;
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};
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store.delete([key, args[0]]);
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} else {
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value = args[1] === undefined ? this.uuid() : args[1];
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store[operation === 'add' ? 'add' : 'put'](args[0], [key, value]);
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}
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} else tx.abort();
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});
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}
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}
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