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44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
'use strict';
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const events = require("events");
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module.exports = function createDeduplicator(options) {
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let mergedOptions = Object.assign({
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historyLength: 10
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}, options);
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let seenMessages = {}; // FIXME: Use a Set instead?
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function tryMessage(client, data, callback) {
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if (client.socketId == null) {
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// FIXME: Warning!
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console.error("Not deduplicating message because client.socketId is null");
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callback();
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} else if (data.messageId == null) {
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// FIXME: Warning!
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console.error("Not deduplicating message because data.messageId is null");
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callback();
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} else {
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if (seenMessages[client.socketId] == null) {
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seenMessages[client.socketId] = [];
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}
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let clientSeenMessages = seenMessages[client.socketId];
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if (clientSeenMessages.indexOf(data.messageId) !== 1) {
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clientSeenMessages.push(data);
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if (clientSeenMessages.length > mergedOptions.historyLength) {
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clientSeenMessages.shift();
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}
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callback();
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}
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}
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}
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tryMessage.forgetClient = function forgetClient(client) {
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delete seenMessages[client.socketId];
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}
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}
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