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redlinkProducer.js
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redlinkProducer.js
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const alasql = require('alasql');
const fs = require('fs-extra');
const base64Helper = require('./base64-helper.js');
const rateLimiterProvider = require('./rateLimiter.js');
let RED;
module.exports.initRED = function (_RED) {
RED = _RED;
};
module.exports.RedLinkProducer = function (config) {
RED.nodes.createNode(this, config);
const node = this;
node.producerStoreName = config.producerStoreName;
node.producerConsumer = config.producerConsumer;
node.sendOnly = config.sendOnly;
node.debug = config.showDebug;
node.manualRead = config.manualRead;
node.ett = +config.producerETT;
node.notify = +config.notifyInterval;
node.rateTypeSendReceive = config.rateTypeSendReceive;
node.rateSendReceive = config.rateSendReceive;
node.rateUnitsSendReceive = config.rateUnitsSendReceive;
node.rateUnitsSendReceive = config.rateUnitsSendReceive;
node.nbRateUnitsSendReceive = config.nbRateUnitsSendReceive;
node.priority = config.priority;
node.enforceReversePath = config.enforceReversePath;
node.notifyTimerInterval = 2 * 1000; //2 s- make sure this is an integer
node.cleanInMessagesTask = setInterval(cleanInMessages, node.notifyTimerInterval) ;
node.reSyncTime = 2000; // This timer defines the producer store update sync for status info.
node.reSyncTimerId = {};
node.reSyncTimerId = reSyncStatus(node.reSyncTime); // This is the main call to sync this producer with its store on startup and it also starts the interval timer.
node.reNotifyTime = 2000; // This timer defines the producer store update sync for replyNotifies
node.reNotifyTimerId = {};
const rateType = node.manualRead ? 'none' : (node.rateTypeSendReceive || 'none');
const limiter = rateType==='none' ? null: rateLimiterProvider.getRateLimiter(config.rateSendReceive, config.nbRateUnitsSendReceive, config.rateUnitsSendReceive);
const largeMessagesDirectory = require('./redlinkSettings.js')(RED, node.producerStoreName).largeMessagesDirectory;
const largeMessageThreshold = require('./redlinkSettings.js')(RED, node.producerStoreName).largeMessageThreshold;
node.reNotifyTimerId = reNotifyProducer(node.reNotifyTime); // This is the main call to sync this consumer with its store on startup and it also starts the interval timer.
node.status({fill: "grey", shape: "dot", text: 'Initialising'});
try {
fs.ensureDirSync(largeMessagesDirectory);
}
catch (e) {
const errorMsg = `Unable to create directory to store large messages ${largeMessagesDirectory} Exception: ${e.toString()}`;
const failureMessage = getFailureMessage('producerInit', errorMsg, null, null);
sendMessage({failure: failureMessage, debug: failureMessage});
}
function cleanInMessages() {
//1. increment lifetime, timeSinceNotify both by 2
const increment = node.notifyTimerInterval / 1000;
const updateSql = 'UPDATE inMessages SET lifetime = lifetime + ' + increment + ', timeSinceNotify = timeSinceNotify +' + increment + ' WHERE redlinkProducerId="' + node.id + '"';
alasql(updateSql);
let msgsByThisProducerSql;
let msgsByThisProducer;
if (node.sendOnly) {
//2. if sendonly: for all unread messages, if lifetime>ett, fail; else if timeSinceNotify>= notify, renotify and reset timeSinceNotify
msgsByThisProducerSql = 'SELECT * FROM inMessages WHERE read=' + false + ' AND redlinkProducerId="' + node.id + '"';
}
else
{
//3. if !sendOnly, for all messages (read, unread) if lifetime >ett fail; ; else if timeSinceNotify>= notify, renotify and reset timeSinceNotify
msgsByThisProducerSql = 'SELECT * FROM inMessages WHERE redlinkProducerId="' + node.id + '"';
}
msgsByThisProducer = alasql(msgsByThisProducerSql);
msgsByThisProducer.forEach(msg => {
if (node.ett !== -1 && msg.lifetime > node.ett) { failMessageAndRemove(msg.redlinkMsgId); }
else
if (msg.timeSinceNotify >= node.notify) { reNotify(msg); }
});
}
function getInsertSql(obj){
const vals = Object.values(obj);
let returnStr = '';
vals.forEach((val, index)=>{
if(typeof val === "string") { val = '"'+val+'"'; }
returnStr += index === 0? val : ','+val;
});
return returnStr;
}
function reNotify(msg){
// simply remove message and reinsert to trigger notification
// deleteNotifiesForMessage(msg.redlinkMsgId);
// Notify Only if a consumer has NOT picked up this message
const msgsByThisProducerSql = 'SELECT * FROM inMessages WHERE redlinkMsgId = "'+msg.redlinkMsgId+'" AND redlinkProducerId="' + node.id + '" and storeName ="'+node.producerStoreName+'" and consumerId=""';
if (alasql(msgsByThisProducerSql).length > 0) {
deleteMessage(msg.redlinkMsgId);
msg.timeSinceNotify = 0;
const reinsertMessageSql = "INSERT INTO inMessages ("+getInsertSql(msg)+")";
alasql(reinsertMessageSql);
}
}
function deleteMessage(redlinkMsgId) {
alasql('DELETE from inMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId="' + redlinkMsgId + '"');
}
function deleteNotifiesForMessage(redlinkMsgId) {
alasql('DELETE from notify WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId = "' + redlinkMsgId + '" and redlinkProducerId="' + node.id + '"');
}
function deleteReplyForMessage(redlinkMsgId) {
alasql('DELETE from replyMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId="' + redlinkMsgId + '"');
}
function failMessageAndRemove(redlinkMsgId){
sendFailureMessage(redlinkMsgId);
deleteMessage(redlinkMsgId);
deleteNotifiesForMessage(redlinkMsgId);
deleteReplyForMessage(redlinkMsgId);
}
const nodeId = config.id.replace('.', '');
const replyMsgTriggerName = 'replyMessage' + nodeId;
function sendOutNotify(){
const nResult = alasql('SELECT COUNT(redlinkProducerId) as myCount from replyMessages WHERE read=false and storeName="' + node.producerStoreName + '" AND redlinkProducerId="'+node.id+'"');
if (nResult[0].myCount > 0){
const data = alasql('SELECT * from replyMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkProducerId="' + node.id + '"');
const notifyMessage = { // todo store more info in replyMesssages- store, etc and populate in notify msg
producerName: node.name,
redlinkProducerId: node.id,
redlinkMsgId: data[0].redlinkMsgId,
notifyType: 'producerReplyNotification',
replyCount: nResult[0].myCount
};
if (node.manualRead) { sendMessage({notify: notifyMessage}); }
}
}
alasql.fn[replyMsgTriggerName] = () => {
// look up inMessages table to see if this producer actually sent the message
const unreadRepliesSql = 'SELECT redlinkMsgId FROM replyMessages WHERE storeName="' + node.producerStoreName + '" AND read=false AND redlinkProducerId="' + node.id + '"';
const unreadReplies = alasql(unreadRepliesSql);
sendMessage({ debug: { storeName: node.producerStoreName, consumerName: node.producerConsumer, action: 'producerReplyRead', direction: 'inBound', 'unreadReplies': unreadReplies } });
if (unreadReplies && unreadReplies.length > 0) {
let unreadMsgIdsStr = '(';
unreadReplies.forEach(reply => { unreadMsgIdsStr += '"' + reply.redlinkMsgId + '",' });
unreadMsgIdsStr = unreadMsgIdsStr.substring(0, unreadMsgIdsStr.length - 1) + ')';
const msgsByThisProducerSql = 'SELECT * FROM inMessages WHERE redlinkMsgId IN ' + unreadMsgIdsStr + ' AND redlinkProducerId="' + node.id + '"';
const msgsByThisProducer = alasql(msgsByThisProducerSql); // should be length one if reply got for message from this producer else zero
if (msgsByThisProducer && msgsByThisProducer.length === 0) {
// Strange problem, If I end up here, the message has already been processed and the reply needs to be removed, its usually caused by multiple high traffic triggers at the same time
alasql('DELETE from replyMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId="' + unreadReplies[0].redlinkMsgId + '"');
}
else
{
const daId = msgsByThisProducer[0].redlinkMsgId;
const relevanttReplySql = 'SELECT * FROM replyMessages WHERE redlinkMsgId="' + daId + '"';
let relevantReplies = alasql(relevanttReplySql); // should have just one result
if (relevantReplies && relevantReplies.length > 0) {
if (node.manualRead) { sendOutNotify(); }
else
{
sendOutNotify();
if (limiter === null) {
const reply = getReply(daId, relevanttReplySql, relevantReplies, msgsByThisProducer[0].preserved);
sendMessage({receive: reply});
}
else
{
limiter.removeTokens(1, function (err, remainingRequests) {
relevantReplies = alasql(relevanttReplySql); // should have just one result
if (!relevantReplies || relevantReplies.length === 0) { return; }
const reply = getReply(daId, relevanttReplySql, relevantReplies, msgsByThisProducer[0].preserved,);
sendMessage({receive: reply});
});
}
}
}
}
}
};
const createReplyMsgTriggerSql = 'CREATE TRIGGER ' + replyMsgTriggerName + ' AFTER INSERT ON replyMessages CALL ' + replyMsgTriggerName + '()';
alasql(createReplyMsgTriggerSql);
function getReplyMessage(relevantReply) {//todo see if we want to convert to streams here- may not be worthwhile
if(relevantReply && relevantReply.isLargeMessage){
// read from disk and return;
const path = largeMessagesDirectory + relevantReply.redlinkMsgId +'/reply.txt';
// read msg from path
return fs.readFileSync(path, 'utf-8');
}
return relevantReply.replyMessage;
}
function getReplyMsgData(redlinkMsgId) {
const msgId = redlinkMsgId;
const relevanttReplySql = 'SELECT * FROM replyMessages WHERE redlinkMsgId="' + msgId + '"';
const relevantReplies = alasql(relevanttReplySql); // should have just one result
if (relevantReplies && relevantReplies.length > 0) { return getReply(msgId, relevanttReplySql, relevantReplies); }
else { return null; }
}
function getReplyIdData(redlinkMsgId) {
const relevantReplySql = 'SELECT * FROM replyMessages WHERE redlinkProducerId="' + node.id + '"';
const relevantReplies = alasql(relevantReplySql); // should have just one result
if (relevantReplies && relevantReplies.length > 0) { return getReply(relevantReplies[0].redlinkMsgId, relevantReplySql, relevantReplies); }
else { return null; }
}
function getReply(daId, relevanttReplySql, relevantReplies) {
const replyMessage = getReplyMessage(relevantReplies[0]);
const origMessageSql = 'SELECT * from inMessages WHERE redlinkMsgId="' + daId + '"';
const origMessage = alasql(origMessageSql);
let preserved;
let reply;
if (origMessage && origMessage.length > 0) {
if (origMessage[0].isLargeMessage) {
// read preserved from file
const path = largeMessagesDirectory + daId + '/preserved.txt';
preserved = fs.readFileSync(path, 'utf-8');
}
else
{
preserved = origMessage[0].preserved;
}
reply = {
payload: base64Helper.decode(replyMessage),
redlinkMsgId: daId,
redlinkProducerId: relevantReplies[0].redlinkProducerId,
preserved: base64Helper.decode(preserved),
cerror: base64Helper.decode(relevantReplies[0].cerror),
};
const deleteReplyMsg = 'DELETE from replyMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId="' + daId + '"';
const deleteInMsg = 'DELETE from inMessages WHERE storeName="' + node.producerStoreName + '" AND redlinkMsgId="' + daId + '"';
if (origMessage[0].isLargeMessage || relevantReplies[0].isLargeMessage) {
const path = largeMessagesDirectory + daId + '/';
fs.removeSync(path);
}
alasql(deleteReplyMsg);
alasql(deleteInMsg);
}
else
{
reply = { payload: origMessage[0], redlinkMsgId: daId, redlinkProducerId: node.id, error: 'Producer has timed this message out', preserved: '', cerror: '' }
}
return reply;
}
function sendMessage(msg) { // receive, notify, failure, debug
const msgs = [];
if (msg.receive && msg.receive.cerror) {
msg.failure = msg.receive;
delete msg.receive;
}
if (!node.sendOnly) { // receive, notify
if (msg.receive) {delete msg.receive.cerror;}
msgs.push(msg.receive);
msgs.push(msg.notify);
}
msgs.push(msg.failure);
msgs.push(msg.debug);
node.send(msgs);
}
function readMessage(redlinkMsgId){
if (redlinkMsgId) {
const msgSql = 'SELECT * FROM inMessages WHERE redlinkMsgId="' + redlinkMsgId + '"';
const msgs = alasql(msgSql);// should get one or none
if (msgs.length > 0) { // will be zero if the message has already been read
const message = msgs[0];
const isLargeMessage = message.isLargeMessage;
if (isLargeMessage) {
const msgPath = largeMessagesDirectory + redlinkMsgId +'/message.txt';
// read msg from msgPath
const preservedPath = largeMessagesDirectory + redlinkMsgId +'/preserved.txt';
if(fs.pathExistsSync(msgPath)){ msgs[0].message = fs.readFileSync(msgPath, 'utf-8'); }
if(fs.pathExistsSync(preservedPath)){ msgs[0].preserved = fs.readFileSync(preservedPath, 'utf-8'); }
}
}
const data = msgs[0];
data.payload = base64Helper.decode(data.message).payload;
data.preserved = base64Helper.decode(data.preserved);
delete data.message;
return data;
}
}
function sendFailureMessage(redlinkMsgId) {
let originalMessage = readMessage(redlinkMsgId);
let replyMessage = getReplyMsgData(redlinkMsgId);
if (replyMessage && replyMessage.preserved) { delete replyMessage.preserved; }
let errorMsg;
if (node.sendOnly) { errorMsg = `Message ${redlinkMsgId} not read in ${node.ett} seconds`; }
else { errorMsg = `Message ${redlinkMsgId} not read and processed in ${node.ett} seconds`; }
const failureMessage = getFailureMessage('producerTimeout', errorMsg, redlinkMsgId, originalMessage);
sendMessage({ failure: failureMessage, debug: failureMessage });
if (originalMessage.isLargeMessage) { fs.removeSync(largeMessagesDirectory + redlinkMsgId + '/'); }
}
function isLargeMessage(encodedMessage, encodedPreserved) {
return encodedMessage.length + encodedPreserved.length > largeMessageThreshold;
}
function insertNewMessage(redlinkMsgId, service, encodedMessage, encodedPreserved, isLargeMessage, originalMessage) {
if (isLargeMessage) {
const path = largeMessagesDirectory + redlinkMsgId + '/';
try {
fs.ensureDirSync(largeMessagesDirectory);
}
catch (e) {
const errorMsg = `Unable to create directory to store large messages ${largeMessagesDirectory} Exception: ${e.toString()}`;
const failureMessage = getFailureMessage('producerSend', errorMsg, redlinkMsgId, originalMessage);
sendMessage({failure: failureMessage, debug: failureMessage});
return;
}
try {
fs.outputFileSync(path + 'message.txt', encodedMessage);
fs.outputFileSync(path + 'preserved.txt', encodedPreserved);
}
catch (e) {
const errorMsg = `Unable to write large message to file in directory ${path} Exception: ${e.toString()}`;
const failureMessage = getFailureMessage('producerSend', errorMsg, redlinkMsgId, originalMessage);
sendMessage({failure: failureMessage, debug: failureMessage});
return;
}
const msgInsertSql = 'INSERT INTO inMessages VALUES ("' + redlinkMsgId + '","' + node.producerStoreName + '","' + service + '",""' +
',' + false + ',' + node.sendOnly + ',"' + node.id + '","",' + Date.now() + ',' + node.priority + ',' + true +','+0+','+0+ ','+node.enforceReversePath+',"")';
// redlinkMsgId STRING, storeName STRING, serviceName STRING, message STRING,
// read BOOLEAN, sendOnly BOOLEAN, redlinkProducerId STRING,preserved STRING, timestamp BIGINT, priority INT, isLargeMessage BOOLEAN
alasql(msgInsertSql);
}
else
{
const msgInsertSql = 'INSERT INTO inMessages VALUES ("' + redlinkMsgId + '","' + node.producerStoreName + '","' + service + '","' + encodedMessage +
'",' + false + ',' + node.sendOnly + ',"' + node.id + '","' + encodedPreserved + '",' + Date.now() + ',' + node.priority + ',' + false +','+0+','+0+','+node.enforceReversePath+',"")';
alasql(msgInsertSql);
}
}
function reSyncStatus(timeOut) {
return setInterval(function () {
// First get any local consumers that I own and update my own global entries in my own store, this updates ttl.
// const selectConsumerSql = 'SELECT * FROM localStoreConsumers WHERE storeName="' + node.consumerStoreName +'"' + ' AND serviceName="' + node.name + '" AND consumerId="' + node.id + '"';
const sResult = alasql('SELECT storeName from stores WHERE storeName = "' + node.producerStoreName + '"');
const mResult = alasql('SELECT count(*) as myCount FROM inMessages where read=false and storeName ="' + node.producerStoreName + '" and redlinkProducerId="' + node.id + '"');
const nResult = alasql('SELECT count(*) as myCount FROM notify where read=false and storeName ="' + node.producerStoreName + '" and redlinkProducerId="' + node.id + '"');
const rResult = alasql('SELECT count(*) as myCount FROM replyMessages where read=false and storeName ="' + node.producerStoreName + '" and redlinkProducerId="' + node.id + '"');
if (sResult.length > 0) { node.status({fill: "green", shape: "dot", text: 'M:'+ mResult[0].myCount +' N:'+nResult[0].myCount+' R:'+rResult[0].myCount}); }
else { node.status({fill: "red", shape: "dot", text: 'Error: No Store:'+node.producerStoreName}); }
},timeOut);
}
function reNotifyProducer(timeOut) {
return setInterval(function () {
sendOutNotify();
},timeOut);
}
node.on("close", (removed, done) => {
clearInterval(node.reSyncTimerId);
clearInterval(node.reNotifyTimerId);
clearInterval(node.cleanInMessagesTask);
done();
});
function getFailureMessage(action, error, redlinkMsgId, originalMessage){
return {
producerName: node.name,
producerId: node.id,
producerStoreName: node.producerStoreName,
consumerName: node.producerConsumer,
action,
error,
redlinkMsgId,
originalMessage
}
}
node.on("input", msg => {
if (msg.topic === 'read' || msg.topic === 'producerReplyRead') {
if (node.manualRead) {
if (node.manualRead && msg.redlinkMsgId) { // redlinkMsgId specified
sendMessage({receive: getReplyMsgData(msg.redlinkMsgId)});
} else // No redlinkMsgId given, so assume any message from this Producer
if (node.manualRead) { sendMessage({ receive: getReplyIdData(msg.redlinkMsgId) }); }
else
{ // send error?
}
}
return;
}
/* else { assume that msg.topic contains destination service/consumer }*/
let service = node.producerConsumer;
// Assume that this is an insert Producer message
msg.redlinkMsgId = RED.util.generateId();
const preserved = msg.preserved || '';
if (typeof msg.enforceReversePath != 'undefined') { node.enforceReversePath = msg.enforceReversePath; }
else { node.enforceReversePath = config.enforceReversePath; }
if (node.producerConsumer === 'msg.topic') {
// Verify Service first if msg.topic, the service must exist, you cannot produce to a non existent service
service = msg.topic || '';
if (service.length > 0) {
const storeName = node.producerStoreName;
const meshName = storeName.substring(0, storeName.indexOf(':')); // Producers can only send to Consumers on the same mesh
const consumer = alasql('SELECT * from (SELECT distinct serviceName from ( select * from globalStoreConsumers WHERE localStoreName LIKE "' + meshName + '%"' +
' union select * from localStoreConsumers WHERE storeName LIKE "' + meshName + '%") WHERE serviceName = "' + service + '") ');
if (!consumer.length > 0) {
const errorMsg = `Store ${node.producerStoreName} does not know about service ${service} specified in msg.topic`;
sendMessage({failure: getFailureMessage('producerSend', errorMsg, msg.redlinkMsgId, msg)});
return;
}
}
else
{
const errorMsg = `Blank service specified in msg.topic`;
sendMessage({failure: getFailureMessage('producerSend', errorMsg, msg.redlinkMsgId, msg)});
return;
}
}
if (service.length > 0) {
delete msg.preserved;
const encodedMessage = base64Helper.encode(msg);
const encodedPreserved = base64Helper.encode(preserved);
const largeMessage = isLargeMessage(encodedMessage, encodedPreserved);
if (largeMessage) { insertNewMessage(msg.redlinkMsgId, service, encodedMessage, encodedPreserved, true, msg); }
else { insertNewMessage(msg.redlinkMsgId, service, encodedMessage, encodedPreserved, false, msg); }
}
else
{
const errorMsg = 'Blank service specified in producer';
sendMessage({failure: getFailureMessage('producerSend',errorMsg,msg.redlinkMsgId, msg)});
}
});
};