90 lines
2.3 KiB
JavaScript
90 lines
2.3 KiB
JavaScript
/*global require,module,process*/
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const Datastore = require('@google-cloud/datastore');
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const winston = require('winston');
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class GoogleDatastoreDocumentStore {
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// Create a new store with options
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constructor(options) {
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this.kind = "Haste";
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this.expire = options.expire;
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this.datastore = new Datastore();
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}
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// Save file in a key
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set(key, data, callback, skipExpire) {
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var expireTime = (skipExpire || this.expire === undefined) ? null : new Date(Date.now() + this.expire * 1000);
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var taskKey = this.datastore.key([this.kind, key])
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var task = {
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key: taskKey,
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data: [
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{
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name: 'value',
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value: data,
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excludeFromIndexes: true
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},
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{
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name: 'expiration',
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value: expireTime
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}
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]
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};
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this.datastore.insert(task).then(() => {
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callback(true);
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})
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.catch(err => {
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callback(false);
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});
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}
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// Get a file from a key
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get(key, callback, skipExpire) {
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var taskKey = this.datastore.key([this.kind, key])
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this.datastore.get(taskKey).then((entity) => {
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if (skipExpire || entity[0]["expiration"] == null) {
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callback(entity[0]["value"]);
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}
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else {
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// check for expiry
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if (entity[0]["expiration"] < new Date()) {
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winston.info("document expired", {key: key, expiration: entity[0]["expiration"], check: new Date(null)});
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callback(false);
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}
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else {
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// update expiry
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var task = {
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key: taskKey,
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data: [
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{
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name: 'value',
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value: entity[0]["value"],
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excludeFromIndexes: true
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},
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{
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name: 'expiration',
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value: new Date(Date.now() + this.expire * 1000)
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}
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]
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};
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this.datastore.update(task).then(() => {
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})
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.catch(err => {
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winston.error("failed to update expiration", {error: err});
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});
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callback(entity[0]["value"]);
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}
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}
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})
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.catch(err => {
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winston.error("Error retrieving value from Google Datastore", {error: err});
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callback(false);
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});
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}
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}
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module.exports = GoogleDatastoreDocumentStore;
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