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node-red/nodes/core/logic/17-split.js

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2016-06-04 01:40:40 +02:00
/**
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
module.exports = function(RED) {
"use strict";
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function sendArray(node,msg,array) {
for (var i = 0; i < array.length-1; i++) {
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msg.payload = array[i];
msg.parts.index = node.c++;
if (node.stream !== true) { msg.parts.count = array.length; }
node.send(RED.util.cloneMessage(msg));
}
if (node.stream !== true) {
msg.payload = array[i];
msg.parts.index = node.c++;
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msg.parts.count = array.length;
node.send(RED.util.cloneMessage(msg));
node.c = 0;
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}
else { node.remainder = array[i]; }
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}
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function SplitNode(n) {
RED.nodes.createNode(this,n);
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var node = this;
node.stream = n.stream;
node.spltType = n.spltType || "str";
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node.addname = n.addname || "";
try {
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if (node.spltType === "str") {
this.splt = (n.splt || "\\n").replace(/\\n/,"\n").replace(/\\r/,"\r").replace(/\\t/,"\t").replace(/\\e/,"\e").replace(/\\f/,"\f").replace(/\\0/,"\0");
} else if (node.spltType === "bin") {
var spltArray = JSON.parse(n.splt);
if (Array.isArray(spltArray)) {
this.splt = Buffer.from(spltArray);
} else {
throw new Error("not an array");
}
this.spltBuffer = spltArray;
} else if (node.spltType === "len") {
this.splt = parseInt(n.splt);
if (isNaN(this.splt) || this.splt < 1) {
throw new Error("invalid split length: "+n.splt);
}
}
this.arraySplt = (n.arraySplt === undefined)?1:parseInt(n.arraySplt);
if (isNaN(this.arraySplt) || this.arraySplt < 1) {
throw new Error("invalid array split length: "+n.arraySplt);
}
} catch(err) {
this.error("Invalid split property: "+err.toString());
return;
}
node.c = 0;
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node.buffer = Buffer.from([]);
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this.on("input", function(msg) {
if (msg.hasOwnProperty("payload")) {
if (msg.hasOwnProperty("parts")) { msg.parts = { parts:msg.parts }; } // push existing parts to a stack
else { msg.parts = {}; }
msg.parts.id = msg._msgid; // use the existing _msgid by default.
if (typeof msg.payload === "string") { // Split String into array
msg.payload = (node.remainder || "") + msg.payload;
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msg.parts.type = "string";
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if (node.spltType === "len") {
msg.parts.ch = "";
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msg.parts.len = node.splt;
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var count = msg.payload.length/node.splt;
if (Math.floor(count) !== count) {
count = Math.ceil(count);
}
if (node.stream !== true) {
msg.parts.count = count;
node.c = 0;
}
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var pos = 0;
var data = msg.payload;
for (var i=0; i<count-1; i++) {
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msg.payload = data.substring(pos,pos+node.splt);
msg.parts.index = node.c++;
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pos += node.splt;
node.send(RED.util.cloneMessage(msg));
}
node.remainder = data.substring(pos);
if ((node.stream !== true) || (node.remainder.length === node.splt)) {
msg.payload = node.remainder;
msg.parts.index = node.c++;
node.send(RED.util.cloneMessage(msg));
node.remainder = "";
}
}
else {
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var a = [];
if (node.spltType === "bin") {
if (!node.spltBufferString) {
node.spltBufferString = node.splt.toString();
}
a = msg.payload.split(node.spltBufferString);
msg.parts.ch = node.spltBuffer; // pass the split char to other end for rejoin
} else if (node.spltType === "str") {
a = msg.payload.split(node.splt);
msg.parts.ch = node.splt; // pass the split char to other end for rejoin
}
sendArray(node,msg,a);
}
}
else if (Array.isArray(msg.payload)) { // then split array into messages
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msg.parts.type = "array";
var count = msg.payload.length/node.arraySplt;
if (Math.floor(count) !== count) {
count = Math.ceil(count);
}
msg.parts.count = count;
var pos = 0;
var data = msg.payload;
msg.parts.len = node.arraySplt;
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for (var i=0; i<count; i++) {
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msg.payload = data.slice(pos,pos+node.arraySplt);
if (node.arraySplt === 1) {
msg.payload = msg.payload[0];
}
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msg.parts.index = i;
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pos += node.arraySplt;
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node.send(RED.util.cloneMessage(msg));
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}
}
else if ((typeof msg.payload === "object") && !Buffer.isBuffer(msg.payload)) {
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var j = 0;
var l = Object.keys(msg.payload).length;
var pay = msg.payload;
msg.parts.type = "object";
for (var p in pay) {
if (pay.hasOwnProperty(p)) {
msg.payload = pay[p];
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if (node.addname !== "") {
msg[node.addname] = p;
}
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msg.parts.key = p;
msg.parts.index = j;
msg.parts.count = l;
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node.send(RED.util.cloneMessage(msg));
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j += 1;
}
}
}
else if (Buffer.isBuffer(msg.payload)) {
var len = node.buffer.length + msg.payload.length;
var buff = Buffer.concat([node.buffer, msg.payload], len);
msg.parts.type = "buffer";
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if (node.spltType === "len") {
var count = buff.length/node.splt;
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if (Math.floor(count) !== count) {
count = Math.ceil(count);
}
if (node.stream !== true) {
msg.parts.count = count;
node.c = 0;
}
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var pos = 0;
msg.parts.len = node.splt;
for (var i=0; i<count-1; i++) {
msg.payload = buff.slice(pos,pos+node.splt);
msg.parts.index = node.c++;
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pos += node.splt;
node.send(RED.util.cloneMessage(msg));
}
node.buffer = buff.slice(pos);
if ((node.stream !== true) || (node.buffer.length === node.splt)) {
msg.payload = node.buffer;
msg.parts.index = node.c++;
node.send(RED.util.cloneMessage(msg));
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node.buffer = Buffer.from([]);
}
}
else {
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var count = 0;
if (node.spltType === "bin") {
msg.parts.ch = node.spltBuffer;
} else if (node.spltType === "str") {
msg.parts.ch = node.splt;
}
var pos = buff.indexOf(node.splt);
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var end;
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while (pos > -1) {
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count++;
end = pos+node.splt.length;
pos = buff.indexOf(node.splt,end);
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}
count++;
if (node.stream !== true) {
msg.parts.count = count;
node.c = 0;
}
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var i = 0, p = 0;
pos = buff.indexOf(node.splt);
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while (pos > -1) {
msg.payload = buff.slice(p,pos);
msg.parts.index = node.c++;
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node.send(RED.util.cloneMessage(msg));
i++;
p = pos+node.splt.length;
pos = buff.indexOf(node.splt,p);
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}
if ((node.stream !== true) && (p < buff.length)) {
msg.payload = buff.slice(p,buff.length);
msg.parts.index = node.c++;
msg.parts.count = node.c++;
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node.send(RED.util.cloneMessage(msg));
}
else {
node.buffer = buff.slice(p,buff.length);
}
}
}
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//else { } // otherwise drop the message.
}
});
}
RED.nodes.registerType("split",SplitNode);
var _max_kept_msgs_count = undefined;
function max_kept_msgs_count(node) {
if (_max_kept_msgs_count === undefined) {
var name = "joinMaxKeptMsgsCount";
if (RED.settings.hasOwnProperty(name)) {
_max_kept_msgs_count = RED.settings[name];
}
else {
_max_kept_msgs_count = 0;
}
}
return _max_kept_msgs_count;
}
function add_to_topic(node, pending, topic, msg) {
var merge_on_change = node.merge_on_change;
if (!pending.hasOwnProperty(topic)) {
pending[topic] = [];
}
var topics = pending[topic];
topics.push(msg);
if (merge_on_change) {
var counts = node.topic_counts;
if (topics.length > counts[topic]) {
topics.shift();
node.pending_count--;
}
}
}
function compute_topic_counts(topics) {
var counts = {};
for (var topic of topics) {
counts[topic] = (counts.hasOwnProperty(topic) ? counts[topic] : 0) +1;
}
return counts;
}
function try_merge(node, pending, merge_on_change) {
var topics = node.topics;
var counts = node.topic_counts;
for(var topic of topics) {
if(!pending.hasOwnProperty(topic) ||
(pending[topic].length < counts[topic])) {
return;
}
}
var merge_on_change = node.merge_on_change;
var msgs = [];
var vals = [];
var new_msg = {payload: vals};
for (var topic of topics) {
var pmsgs = pending[topic];
var msg = pmsgs.shift();
if (merge_on_change) {
pmsgs.push(msg);
}
var pval = msg.payload;
var val = new_msg[topic];
msgs.push(msg);
vals.push(pval);
if (val instanceof Array) {
new_msg[topic].push(pval);
}
else if (val === undefined) {
new_msg[topic] = pval;
}
else {
new_msg[topic] = [val, pval]
}
}
node.send(new_msg);
if (!merge_on_change) {
node.pending_count -= topics.length;
}
}
function merge_msg(node, msg) {
var topics = node.topics;
var topic = msg.topic;
if(node.topics.indexOf(topic) >= 0) {
var pending = node.pending;
if(node.topic_counts == undefined) {
node.topic_counts = compute_topic_counts(topics)
}
add_to_topic(node, pending, topic, msg);
node.pending_count++;
var max_msgs = max_kept_msgs_count(node);
if ((max_msgs > 0) && (node.pending_count > max_msgs)) {
node.pending = {};
node.pending_count = 0;
node.error(RED._("join.too-many"), msg);
}
try_merge(node, pending);
}
}
function apply_r(exp, accum, msg, index, count) {
exp.assign("I", index);
exp.assign("N", count);
exp.assign("A", accum);
return RED.util.evaluateJSONataExpression(exp, msg);
}
function apply_f(exp, accum, count) {
exp.assign("N", count);
exp.assign("A", accum);
return RED.util.evaluateJSONataExpression(exp, {});
}
function exp_or_undefined(exp) {
if((exp === "") ||
(exp === null)) {
return undefined;
}
return exp
}
function reduce_and_send_group(node, group) {
var is_right = node.reduce_right;
var flag = is_right ? -1 : 1;
var msgs = group.msgs;
var accum = node.reduce_init;
var reduce_exp = node.reduce_exp;
var reduce_fixup = node.reduce_fixup;
var count = group.count;
msgs.sort(function(x,y) {
var ix = x.parts.index;
var iy = y.parts.index;
if (ix < iy) return -flag;
if (ix > iy) return flag;
return 0;
});
for(var msg of msgs) {
accum = apply_r(reduce_exp, accum, msg, msg.parts.index, count);
}
if(reduce_fixup !== undefined) {
accum = apply_f(reduce_fixup, accum, count);
}
node.send({payload: accum});
}
function reduce_msg(node, msg) {
if(msg.hasOwnProperty('parts')) {
var parts = msg.parts;
var pending = node.pending;
var pending_count = node.pending_count;
var gid = msg.parts.id;
if(!pending.hasOwnProperty(gid)) {
var count = undefined;
if(parts.hasOwnProperty('count')) {
count = msg.parts.count;
}
pending[gid] = {
count: count,
msgs: []
};
}
var group = pending[gid];
var msgs = group.msgs;
if(parts.hasOwnProperty('count') &&
(group.count === undefined)) {
group.count = count;
}
msgs.push(msg);
pending_count++;
if(msgs.length === group.count) {
delete pending[gid];
try {
pending_count -= msgs.length;
reduce_and_send_group(node, group);
} catch(e) {
node.error(RED._("join.errors.invalid-expr",{error:e.message})); }
}
node.pending_count = pending_count;
var max_msgs = max_kept_msgs_count(node);
if ((max_msgs > 0) && (pending_count > max_msgs)) {
node.pending = {};
node.pending_count = 0;
node.error(RED._("join.too-many"), msg);
}
}
else {
node.send(msg);
}
}
function eval_exp(node, exp, exp_type) {
if(exp_type === "flow") {
return node.context().flow.get(exp);
}
else if(exp_type === "global") {
return node.context().global.get(exp);
}
else if(exp_type === "str") {
return exp;
}
else if(exp_type === "num") {
return Number(exp);
}
else if(exp_type === "bool") {
if (exp === 'true') {
return true;
}
else if (exp === 'false') {
return false;
}
}
else if ((exp_type === "bin") ||
(exp_type === "json")) {
return JSON.parse(exp);
}
else if(exp_type === "date") {
return Date.now();
}
else if(exp_type === "jsonata") {
var jexp = RED.util.prepareJSONataExpression(exp, node);
return RED.util.evaluateJSONataExpression(jexp, {});
}
throw new Error("unexpected initial value type");
}
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function JoinNode(n) {
RED.nodes.createNode(this,n);
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this.mode = n.mode||"auto";
this.property = n.property||"payload";
this.propertyType = n.propertyType||"msg";
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if (this.propertyType === 'full') {
this.property = "payload";
}
this.key = n.key||"topic";
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this.timer = (this.mode === "auto") ? 0 : Number(n.timeout || 0)*1000;
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this.count = Number(n.count || 0);
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this.joiner = n.joiner||"";
this.joinerType = n.joinerType||"str";
this.reduce = (this.mode === "reduce");
if (this.reduce) {
var exp_init = n.reduceInit;
var exp_init_type = n.reduceInitType;
var exp_reduce = n.reduceExp;
var exp_fixup = exp_or_undefined(n.reduceFixup);
this.reduce_right = n.reduceRight;
try {
this.reduce_init = eval_exp(this, exp_init, exp_init_type);
this.reduce_exp = RED.util.prepareJSONataExpression(exp_reduce, this);
this.reduce_fixup = (exp_fixup !== undefined) ? RED.util.prepareJSONataExpression(exp_fixup, this) : undefined;
} catch(e) {
this.error(RED._("join.errors.invalid-expr",{error:e.message}));
}
}
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if (this.joinerType === "str") {
this.joiner = this.joiner.replace(/\\n/g,"\n").replace(/\\r/g,"\r").replace(/\\t/g,"\t").replace(/\\e/g,"\e").replace(/\\f/g,"\f").replace(/\\0/g,"\0");
} else if (this.joinerType === "bin") {
var joinArray = JSON.parse(n.joiner)
if (Array.isArray(joinArray)) {
this.joiner = Buffer.from(joinArray);
} else {
throw new Error("not an array");
}
}
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this.build = n.build || "array";
this.accumulate = n.accumulate || "false";
this.topics = (n.topics || []).map(function(x) { return x.topic; });
this.merge_on_change = n.mergeOnChange || false;
this.topic_counts = undefined;
this.output = n.output || "stream";
this.pending = {};
this.pending_count = 0;
//this.topic = n.topic;
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var node = this;
var inflight = {};
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var completeSend = function(partId) {
var group = inflight[partId];
clearTimeout(group.timeout);
if ((node.accumulate !== true) || group.msg.hasOwnProperty("complete")) { delete inflight[partId]; }
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if (group.type === 'array' && group.arrayLen > 1) {
var newArray = [];
group.payload.forEach(function(n) {
newArray = newArray.concat(n);
})
group.payload = newArray;
} else if (group.type === 'buffer') {
var buffers = [];
var bufferLen = 0;
if (group.joinChar !== undefined) {
var joinBuffer = Buffer.from(group.joinChar);
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for (var i=0; i<group.payload.length; i++) {
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if (i > 0) {
buffers.push(joinBuffer);
bufferLen += joinBuffer.length;
}
buffers.push(group.payload[i]);
bufferLen += group.payload[i].length;
}
} else {
bufferLen = group.bufferLen;
buffers = group.payload;
}
group.payload = Buffer.concat(buffers,bufferLen);
}
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if (group.type === 'string') {
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var groupJoinChar = group.joinChar;
if (typeof group.joinChar !== 'string') {
groupJoinChar = group.joinChar.toString();
}
RED.util.setMessageProperty(group.msg,node.property,group.payload.join(groupJoinChar));
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} else {
if (node.propertyType === 'full') {
group.msg = RED.util.cloneMessage(group.msg);
}
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RED.util.setMessageProperty(group.msg,node.property,group.payload);
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}
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if (group.msg.hasOwnProperty('parts') && group.msg.parts.hasOwnProperty('parts')) {
group.msg.parts = group.msg.parts.parts;
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} else {
delete group.msg.parts;
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}
delete group.msg.complete;
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node.send(group.msg);
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}
this.on("input", function(msg) {
try {
var property;
if (node.mode === 'auto' && (!msg.hasOwnProperty("parts")||!msg.parts.hasOwnProperty("id"))) {
node.warn("Message missing msg.parts property - cannot join in 'auto' mode")
return;
}
if (node.mode === 'merge' && !msg.hasOwnProperty("topic")) {
node.warn("Message missing msg.topic property - cannot join in 'merge' mode");
return;
}
if (node.propertyType == "full") {
property = msg;
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}
else {
try {
property = RED.util.getMessageProperty(msg,node.property);
} catch(err) {
node.warn("Message property "+node.property+" not found");
return;
}
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}
var partId;
var payloadType;
var propertyKey;
var targetCount;
var joinChar;
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var arrayLen;
var propertyIndex;
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if (node.mode === "auto") {
// Use msg.parts to identify all of the group information
partId = msg.parts.id;
payloadType = msg.parts.type;
targetCount = msg.parts.count;
joinChar = msg.parts.ch;
propertyKey = msg.parts.key;
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arrayLen = msg.parts.len;
propertyIndex = msg.parts.index;
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}
else if (node.mode === 'merge') {
merge_msg(node, msg);
return;
}
else if (node.mode === 'reduce') {
reduce_msg(node, msg);
return;
}
else {
// Use the node configuration to identify all of the group information
partId = "_";
payloadType = node.build;
targetCount = node.count;
joinChar = node.joiner;
if (targetCount === 0 && msg.hasOwnProperty('parts')) {
targetCount = msg.parts.count || 0;
}
if (node.build === 'object') {
propertyKey = RED.util.getMessageProperty(msg,node.key);
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}
}
if ((payloadType === 'object') && (propertyKey === null || propertyKey === undefined || propertyKey === "")) {
if (node.mode === "auto") {
node.warn("Message missing 'msg.parts.key' property - cannot add to object");
}
else {
if (msg.hasOwnProperty('complete')) {
completeSend(partId);
}
else {
node.warn("Message missing key property 'msg."+node.key+"' - cannot add to object")
}
}
return;
}
if (!inflight.hasOwnProperty(partId)) {
if (payloadType === 'object' || payloadType === 'merged') {
inflight[partId] = {
currentCount:0,
payload:{},
targetCount:targetCount,
type:"object",
msg:msg
};
}
else if (node.accumulate === true) {
if (msg.hasOwnProperty("reset")) { delete inflight[partId]; }
inflight[partId] = inflight[partId] || {
currentCount:0,
payload:{},
targetCount:targetCount,
type:payloadType,
msg:msg
}
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if (payloadType === 'string' || payloadType === 'array' || payloadType === 'buffer') {
inflight[partId].payload = [];
}
}
else {
inflight[partId] = {
currentCount:0,
payload:[],
targetCount:targetCount,
type:payloadType,
msg:msg
};
if (payloadType === 'string') {
inflight[partId].joinChar = joinChar;
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} else if (payloadType === 'array') {
inflight[partId].arrayLen = arrayLen;
} else if (payloadType === 'buffer') {
inflight[partId].bufferLen = 0;
inflight[partId].joinChar = joinChar;
}
}
if (node.timer > 0) {
inflight[partId].timeout = setTimeout(function() {
completeSend(partId)
}, node.timer)
}
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}
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var group = inflight[partId];
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if (payloadType === 'buffer') {
inflight[partId].bufferLen += property.length;
}
if (payloadType === 'object') {
group.payload[propertyKey] = property;
group.currentCount = Object.keys(group.payload).length;
//msg.topic = node.topic || msg.topic;
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} else if (payloadType === 'merged') {
if (Array.isArray(property) || typeof property !== 'object') {
if (!msg.hasOwnProperty("complete")) {
node.warn("Cannot merge non-object types");
}
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} else {
for (propertyKey in property) {
if (property.hasOwnProperty(propertyKey) && propertyKey !== '_msgid') {
group.payload[propertyKey] = property[propertyKey];
}
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}
group.currentCount = Object.keys(group.payload).length;
//group.currentCount++;
}
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} else {
if (!isNaN(propertyIndex)) {
group.payload[propertyIndex] = property;
} else {
group.payload.push(property);
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}
group.currentCount++;
}
// TODO: currently reuse the last received - add option to pick first received
group.msg = msg;
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var tcnt = group.targetCount;
if (msg.hasOwnProperty("parts")) { tcnt = group.targetCount || msg.parts.count; }
if ((tcnt > 0 && group.currentCount >= tcnt) || msg.hasOwnProperty('complete')) {
completeSend(partId);
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}
} catch(err) {
console.log(err.stack);
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}
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});
this.on("close", function() {
for (var i in inflight) {
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if (inflight.hasOwnProperty(i)) {
clearTimeout(inflight[i].timeout);
}
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}
});
}
RED.nodes.registerType("join",JoinNode);
}