83 lines
2.5 KiB
JavaScript
83 lines
2.5 KiB
JavaScript
'use strict';
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const NamedMapMapConfigProvider = require('../models/mapconfig/provider/named-map-provider');
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const templateName = require('../backends/template_maps').templateName;
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const LruCache = require("lru-cache");
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const TEN_MINUTES_IN_MILLISECONDS = 1000 * 60 * 10;
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const ACTIONS = ['update', 'delete'];
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function NamedMapProviderCache(
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templateMaps,
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pgConnection,
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metadataBackend,
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userLimitsBackend,
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mapConfigAdapter,
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affectedTablesCache
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) {
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this.templateMaps = templateMaps;
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this.pgConnection = pgConnection;
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this.metadataBackend = metadataBackend;
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this.userLimitsBackend = userLimitsBackend;
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this.mapConfigAdapter = mapConfigAdapter;
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this.affectedTablesCache = affectedTablesCache;
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this.providerCache = new LruCache({ max: 2000, maxAge: TEN_MINUTES_IN_MILLISECONDS });
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ACTIONS.forEach(action => templateMaps.on(action, (...args) => this.invalidate(...args)));
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}
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module.exports = NamedMapProviderCache;
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NamedMapProviderCache.prototype.get = function(user, templateId, config, authToken, params, callback) {
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const namedMapKey = createNamedMapKey(user, templateId);
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const namedMapProviders = this.providerCache.get(namedMapKey) || {};
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const providerKey = createProviderKey(config, authToken, params);
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if (namedMapProviders.hasOwnProperty(providerKey)) {
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return callback(null, namedMapProviders[providerKey]);
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}
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namedMapProviders[providerKey] = new NamedMapMapConfigProvider(
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this.templateMaps,
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this.pgConnection,
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this.metadataBackend,
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this.userLimitsBackend,
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this.mapConfigAdapter,
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this.affectedTablesCache,
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user,
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templateId,
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config,
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authToken,
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params
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);
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this.providerCache.set(namedMapKey, namedMapProviders);
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return callback(null, namedMapProviders[providerKey]);
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};
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NamedMapProviderCache.prototype.invalidate = function(user, templateId) {
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this.providerCache.del(createNamedMapKey(user, templateId));
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};
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function createNamedMapKey(user, templateId) {
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return user + ':' + templateName(templateId);
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}
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const providerKeyTpl = ctx => `${ctx.authToken}:${ctx.configHash}:${ctx.format}:${ctx.layer}:${ctx.scale_factor}`;
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function createProviderKey(config, authToken, params) {
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const defaults = {
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authToken: authToken || '',
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configHash: NamedMapMapConfigProvider.configHash(config),
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layer: '',
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format: '',
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scale_factor: 1
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};
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const ctx = Object.assign({}, defaults, params);
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return providerKeyTpl(ctx);
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}
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