mirror of
https://github.com/node-red/node-red.git
synced 2023-10-10 13:36:53 +02:00
359 lines
13 KiB
JavaScript
359 lines
13 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 operators = {
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'eq': function(a, b) { return a == b; },
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'neq': function(a, b) { return a != b; },
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'lt': function(a, b) { return a < b; },
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'lte': function(a, b) { return a <= b; },
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'gt': function(a, b) { return a > b; },
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'gte': function(a, b) { return a >= b; },
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'btwn': function(a, b, c) { return a >= b && a <= c; },
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'cont': function(a, b) { return (a + "").indexOf(b) != -1; },
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'regex': function(a, b, c, d) { return (a + "").match(new RegExp(b,d?'i':'')); },
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'true': function(a) { return a === true; },
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'false': function(a) { return a === false; },
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'null': function(a) { return (typeof a == "undefined" || a === null); },
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'nnull': function(a) { return (typeof a != "undefined" && a !== null); },
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'head': function(a, b, c, d, parts) {
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var count = Number(b);
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return (parts.index < count);
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},
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'tail': function(a, b, c, d, parts) {
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var count = Number(b);
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return (parts.count -count <= parts.index);
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},
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'index': function(a, b, c, d, parts) {
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var min = Number(b);
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var max = Number(c);
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var index = parts.index;
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return ((min <= index) && (index <= max));
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},
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'jsonata_exp': function(a, b) { return (b === true); },
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'else': function(a) { return a === true; }
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};
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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 SwitchNode(n) {
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RED.nodes.createNode(this, n);
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this.rules = n.rules || [];
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this.property = n.property;
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this.propertyType = n.propertyType || "msg";
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if (this.propertyType === 'jsonata') {
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try {
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this.property = RED.util.prepareJSONataExpression(this.property,this);
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} catch(err) {
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this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
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return;
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}
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}
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this.checkall = n.checkall || "true";
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this.previousValue = null;
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var node = this;
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var valid = true;
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var repair = n.repair;
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var needs_count = repair;
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for (var i=0; i<this.rules.length; i+=1) {
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var rule = this.rules[i];
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needs_count = needs_count || ((rule.t === "tail") || (rule.t === "jsonata_exp"));
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if (!rule.vt) {
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if (!isNaN(Number(rule.v))) {
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rule.vt = 'num';
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} else {
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rule.vt = 'str';
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}
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}
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if (rule.vt === 'num') {
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if (!isNaN(Number(rule.v))) {
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rule.v = Number(rule.v);
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}
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} else if (rule.vt === "jsonata") {
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try {
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rule.v = RED.util.prepareJSONataExpression(rule.v,node);
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} catch(err) {
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this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
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valid = false;
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}
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}
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if (typeof rule.v2 !== 'undefined') {
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if (!rule.v2t) {
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if (!isNaN(Number(rule.v2))) {
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rule.v2t = 'num';
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} else {
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rule.v2t = 'str';
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}
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}
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if (rule.v2t === 'num') {
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rule.v2 = Number(rule.v2);
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} else if (rule.v2t === 'jsonata') {
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try {
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rule.v2 = RED.util.prepareJSONataExpression(rule.v2,node);
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} catch(err) {
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this.error(RED._("switch.errors.invalid-expr",{error:err.message}));
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valid = false;
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}
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}
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}
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}
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if (!valid) {
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return;
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}
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var pending_count = 0;
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var pending_id = 0;
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var pending_in = {};
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var pending_out = {};
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var received = {};
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function add2group_in(id, msg, parts) {
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if (!(id in pending_in)) {
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pending_in[id] = {
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count: undefined,
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msgs: [],
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seq_no: pending_id++
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};
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}
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var group = pending_in[id];
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group.msgs.push(msg);
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pending_count++;
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var max_msgs = max_kept_msgs_count(node);
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if ((max_msgs > 0) && (pending_count > max_msgs)) {
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clear_pending();
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node.error(RED._("switch.errors.too-many"), msg);
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}
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if (parts.hasOwnProperty("count")) {
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group.count = parts.count;
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}
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return group;
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}
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function del_group_in(id, group) {
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pending_count -= group.msgs.length;
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delete pending_in[id];
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}
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function add2pending_in(msg) {
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var parts = msg.parts;
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if (parts.hasOwnProperty("id") &&
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parts.hasOwnProperty("index")) {
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var group = add2group_in(parts.id, msg, parts);
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var msgs = group.msgs;
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var count = group.count;
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if (count === msgs.length) {
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for (var i = 0; i < msgs.length; i++) {
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var msg = msgs[i];
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msg.parts.count = count;
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process_msg(msg, false);
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}
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del_group_in(parts.id, group);
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}
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return true;
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}
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return false;
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}
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function send_group(onwards, port_count) {
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var counts = new Array(port_count).fill(0);
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for (var i = 0; i < onwards.length; i++) {
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var onward = onwards[i];
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for (var j = 0; j < port_count; j++) {
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counts[j] += (onward[j] !== null) ? 1 : 0
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}
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}
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var ids = new Array(port_count);
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for (var j = 0; j < port_count; j++) {
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ids[j] = RED.util.generateId();
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}
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var ports = new Array(port_count);
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var indexes = new Array(port_count).fill(0);
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for (var i = 0; i < onwards.length; i++) {
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var onward = onwards[i];
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for (var j = 0; j < port_count; j++) {
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var msg = onward[j];
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if (msg) {
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var new_msg = RED.util.cloneMessage(msg);
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var parts = new_msg.parts;
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parts.id = ids[j];
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parts.index = indexes[j];
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parts.count = counts[j];
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ports[j] = new_msg;
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indexes[j]++;
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}
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else {
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ports[j] = null;
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}
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}
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node.send(ports);
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}
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}
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function send2ports(onward, msg) {
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var parts = msg.parts;
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var gid = parts.id;
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received[gid] = ((gid in received) ? received[gid] : 0) +1;
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var send_ok = (received[gid] === parts.count);
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if (!(gid in pending_out)) {
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pending_out[gid] = {
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onwards: []
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};
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}
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var group = pending_out[gid];
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var onwards = group.onwards;
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onwards.push(onward);
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pending_count++;
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if (send_ok) {
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send_group(onwards, onward.length, msg);
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pending_count -= onward.length;
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delete pending_out[gid];
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delete received[gid];
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}
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var max_msgs = max_kept_msgs_count(node);
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if ((max_msgs > 0) && (pending_count > max_msgs)) {
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clear_pending();
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node.error(RED._("switch.errors.too-many"), msg);
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}
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}
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function msg_has_parts(msg) {
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if (msg.hasOwnProperty("parts")) {
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var parts = msg.parts;
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return (parts.hasOwnProperty("id") &&
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parts.hasOwnProperty("index"));
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}
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return false;
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}
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function process_msg(msg, check_parts) {
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var has_parts = msg_has_parts(msg);
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if (needs_count && check_parts && has_parts &&
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add2pending_in(msg)) {
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return;
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}
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var onward = [];
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try {
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var prop;
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if (node.propertyType === 'jsonata') {
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prop = RED.util.evaluateJSONataExpression(node.property,msg);
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} else {
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prop = RED.util.evaluateNodeProperty(node.property,node.propertyType,node,msg);
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}
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var elseflag = true;
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for (var i=0; i<node.rules.length; i+=1) {
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var rule = node.rules[i];
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var test = prop;
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var v1,v2;
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if (rule.vt === 'prev') {
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v1 = node.previousValue;
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} else if (rule.vt === 'jsonata') {
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try {
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var exp = rule.v;
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if (rule.t === 'jsonata_exp') {
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if (has_parts) {
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exp.assign("I", msg.parts.index);
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exp.assign("N", msg.parts.count);
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}
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}
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v1 = RED.util.evaluateJSONataExpression(exp,msg);
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} catch(err) {
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node.error(RED._("switch.errors.invalid-expr",{error:err.message}));
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return;
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}
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} else {
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try {
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v1 = RED.util.evaluateNodeProperty(rule.v,rule.vt,node,msg);
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} catch(err) {
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v1 = undefined;
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}
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}
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v2 = rule.v2;
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if (rule.v2t === 'prev') {
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v2 = node.previousValue;
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} else if (rule.v2t === 'jsonata') {
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try {
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v2 = RED.util.evaluateJSONataExpression(rule.v2,msg);
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} catch(err) {
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node.error(RED._("switch.errors.invalid-expr",{error:err.message}));
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return;
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}
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} else if (typeof v2 !== 'undefined') {
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try {
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v2 = RED.util.evaluateNodeProperty(rule.v2,rule.v2t,node,msg);
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} catch(err) {
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v2 = undefined;
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}
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}
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if (rule.t == "else") { test = elseflag; elseflag = true; }
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if (operators[rule.t](test,v1,v2,rule.case,msg.parts)) {
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onward.push(msg);
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elseflag = false;
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if (node.checkall == "false") { break; }
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} else {
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onward.push(null);
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}
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}
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node.previousValue = prop;
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if (!repair || !has_parts) {
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node.send(onward);
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}
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else {
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send2ports(onward, msg);
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}
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} catch(err) {
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node.warn(err);
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}
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}
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function clear_pending() {
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pending_count = 0;
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pending_id = 0;
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pending_in = {};
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pending_out = {};
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received = {};
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}
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this.on('input', function(msg) {
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process_msg(msg, true);
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});
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this.on('close', function() {
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clear_pending();
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});
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}
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RED.nodes.registerType("switch", SwitchNode);
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}
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