96 lines
3.2 KiB
JavaScript
96 lines
3.2 KiB
JavaScript
var _ = require('underscore');
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var dot = require('dot');
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var NamedMapMapConfigProvider = require('../models/mapconfig/provider/named-map-provider');
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var templateName = require('../backends/template_maps').templateName;
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var queue = require('queue-async');
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var LruCache = require("lru-cache");
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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 });
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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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var namedMapKey = createNamedMapKey(user, templateId);
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var namedMapProviders = this.providerCache.get(namedMapKey) || {};
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var providerKey = createProviderKey(config, authToken, params);
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if (!namedMapProviders.hasOwnProperty(providerKey)) {
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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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// early exit, if provider did not exist we just return it
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return callback(null, namedMapProviders[providerKey]);
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}
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var namedMapProvider = namedMapProviders[providerKey];
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var self = this;
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queue(2)
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.defer(namedMapProvider.getTemplate.bind(namedMapProvider))
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.defer(this.templateMaps.getTemplate.bind(this.templateMaps), user, templateId)
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.awaitAll(function templatesQueueDone(err, results) {
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if (err) {
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return callback(err);
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}
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// We want to reset provider its template has changed
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// Ideally this should be done in a passive mode where this cache gets notified of template changes
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var uniqueFingerprints = _.uniq(results.map(self.templateMaps.fingerPrint)).length;
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if (uniqueFingerprints > 1) {
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namedMapProvider.reset();
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}
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return callback(null, namedMapProvider);
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});
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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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var providerKey = '{{=it.authToken}}:{{=it.configHash}}:{{=it.format}}:{{=it.layer}}:{{=it.scale_factor}}';
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var providerKeyTpl = dot.template(providerKey);
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function createProviderKey(config, authToken, params) {
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var tplValues = _.defaults({}, params, {
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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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return providerKeyTpl(tplValues);
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}
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