mirror of https://github.com/node-red/node-red.git
247 lines
7.9 KiB
JavaScript
247 lines
7.9 KiB
JavaScript
/**
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* Copyright JS Foundation and other contributors, http://js.foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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"use strict";
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var _max_kept_msgs_count = undefined;
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function max_kept_msgs_count(node) {
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if (_max_kept_msgs_count === undefined) {
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var name = "nodeMessageBufferMaxLength";
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if (RED.settings.hasOwnProperty(name)) {
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_max_kept_msgs_count = RED.settings[name];
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}
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else {
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_max_kept_msgs_count = 0;
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}
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}
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return _max_kept_msgs_count;
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}
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function send_msgs(node, msgs, clone_msg) {
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var count = msgs.length;
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var msg_id = msgs[0]._msgid;
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for (var i = 0; i < count; i++) {
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var msg = clone_msg ? RED.util.cloneMessage(msgs[i]) : msgs[i];
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if (!msg.hasOwnProperty("parts")) {
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msg.parts = {};
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}
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var parts = msg.parts;
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parts.id = msg_id;
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parts.index = i;
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parts.count = count;
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node.send(msg);
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}
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}
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function send_interval(node, allow_empty_seq) {
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let msgs = node.pending;
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if (msgs.length > 0) {
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send_msgs(node, msgs, false);
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node.pending = [];
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}
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else {
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if (allow_empty_seq) {
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let mid = RED.util.generateId();
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let msg = {
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payload: null,
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parts: {
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id: mid,
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index: 0,
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count: 1
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}
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};
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node.send(msg);
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}
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}
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}
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function is_complete(pending, topic) {
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if (pending.hasOwnProperty(topic)) {
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var p_topic = pending[topic];
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var gids = p_topic.gids;
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if (gids.length > 0) {
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var gid = gids[0];
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var groups = p_topic.groups;
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var group = groups[gid];
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return (group.count === group.msgs.length);
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}
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}
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return false;
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}
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function get_msgs_of_topic(pending, topic) {
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var p_topic = pending[topic];
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var groups = p_topic.groups;
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var gids = p_topic.gids;
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var gid = gids[0];
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var group = groups[gid];
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return group.msgs;
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}
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function remove_topic(pending, topic) {
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var p_topic = pending[topic];
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var groups = p_topic.groups;
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var gids = p_topic.gids;
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var gid = gids.shift();
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delete groups[gid];
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}
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function try_concat(node, pending) {
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var topics = node.topics;
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for (var topic of topics) {
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if (!is_complete(pending, topic)) {
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return;
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}
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}
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var msgs = [];
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for (var topic of topics) {
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var t_msgs = get_msgs_of_topic(pending, topic);
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msgs = msgs.concat(t_msgs);
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}
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for (var topic of topics) {
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remove_topic(pending, topic);
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}
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send_msgs(node, msgs, true);
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node.pending_count -= msgs.length;
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}
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function add_to_topic_group(pending, topic, gid, msg) {
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if (!pending.hasOwnProperty(topic)) {
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pending[topic] = { groups: {}, gids: [] };
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}
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var p_topic = pending[topic];
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var groups = p_topic.groups;
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var gids = p_topic.gids;
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if (!groups.hasOwnProperty(gid)) {
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groups[gid] = { msgs: [], count: undefined };
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gids.push(gid);
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}
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var group = groups[gid];
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group.msgs.push(msg);
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if ((group.count === undefined) &&
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msg.parts.hasOwnProperty('count')) {
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group.count = msg.parts.count;
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}
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}
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function concat_msg(node, msg) {
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var topic = msg.topic;
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if(node.topics.indexOf(topic) >= 0) {
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if (!msg.hasOwnProperty("parts") ||
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!msg.parts.hasOwnProperty("id") ||
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!msg.parts.hasOwnProperty("index") ||
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!msg.parts.hasOwnProperty("count")) {
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node.error(RED._("batch.no-parts"), msg);
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return;
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}
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var gid = msg.parts.id;
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var pending = node.pending;
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add_to_topic_group(pending, topic, gid, msg);
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node.pending_count++;
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var max_msgs = max_kept_msgs_count(node);
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if ((max_msgs > 0) && (node.pending_count > max_msgs)) {
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node.pending = {};
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node.pending_count = 0;
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node.error(RED._("batch.too-many"), msg);
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}
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try_concat(node, pending);
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}
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}
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function BatchNode(n) {
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RED.nodes.createNode(this,n);
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var node = this;
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var mode = n.mode || "count";
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node.pending_count = 0;
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if (mode === "count") {
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var count = Number(n.count || 1);
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var overlap = Number(n.overlap || 0);
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var is_overlap = (overlap > 0);
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if (count <= overlap) {
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node.error(RED._("batch.count.invalid"));
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return;
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}
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node.pending = [];
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this.on("input", function(msg) {
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var queue = node.pending;
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queue.push(msg);
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node.pending_count++;
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if (queue.length === count) {
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send_msgs(node, queue, is_overlap);
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node.pending =
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(overlap === 0) ? [] : queue.slice(-overlap);
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node.pending_count = 0;
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}
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var max_msgs = max_kept_msgs_count(node);
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if ((max_msgs > 0) && (node.pending_count > max_msgs)) {
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node.pending = [];
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node.pending_count = 0;
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node.error(RED._("batch.too-many"), msg);
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}
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});
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this.on("close", function() {
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node.pending_count = 0;
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node.pending = [];
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});
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}
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else if (mode === "interval") {
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var interval = Number(n.interval || "0") *1000;
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var allow_empty_seq = n.allowEmptySequence;
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node.pending = []
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var timer = setInterval(function() {
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send_interval(node, allow_empty_seq);
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node.pending_count = 0;
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}, interval);
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this.on("input", function(msg) {
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node.pending.push(msg);
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node.pending_count++;
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var max_msgs = max_kept_msgs_count(node);
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if ((max_msgs > 0) && (node.pending_count > max_msgs)) {
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node.pending = [];
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node.pending_count = 0;
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node.error(RED._("batch.too-many"), msg);
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}
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});
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this.on("close", function() {
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clearInterval(timer);
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node.pending = [];
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node.pending_count = 0;
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});
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}
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else if(mode === "concat") {
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node.topics = (n.topics || []).map(function(x) {
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return x.topic;
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});
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node.pending = {};
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this.on("input", function(msg) {
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concat_msg(node, msg);
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});
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this.on("close", function() {
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node.pending = {};
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node.pending_count = 0;
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});
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}
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else {
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node.error(RED._("batch.unexpected"));
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}
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}
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RED.nodes.registerType("batch", BatchNode);
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}
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