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triggers.js
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triggers.js
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const synchronizerModel = require("./synchronizer_db");
const {debug, RESUME_TOKEN_ERROR, CHANGE_STREAM_FATAL_ERROR, changeStreamErrors} = require("./utils");
const axios = require("axios");
let changeStream, dbClient;
let triggersMap = {};
let triggersQueueInfLoopInterval;
exports.start = async function (db) {
dbClient = db || synchronizerModel.getDbClient();
await _buildTriggersMap();
await initChangeStream();
_triggersQueueInfLoop();
};
const _triggersQueueInfLoop = async () => {
clearInterval(triggersQueueInfLoopInterval);
try {
const triggers = await synchronizerModel.getTriggersQueue();
for (let i in triggers) {
const trigger = triggers[i];
axios.post(trigger.url, trigger.fields)
.then(() => synchronizerModel.removeTriggerFromQueue(trigger._id))
.catch(response => _failedTrigger(trigger, trigger.fields, response));
}
} catch (e) {
console.error(e);
}
triggersQueueInfLoopInterval = setTimeout(() => {
_triggersQueueInfLoop();
}, process.env.TRIGGERS_LOOP_INF_INTERVAL || 1000 * 60 * 3);
};
const initChangeStream = async function () {
if (changeStream) {
await changeStream.close();
}
const oldResumeTokenDoc = await synchronizerModel.getResumeToken("trigger");
const resumeAfter = oldResumeTokenDoc ? oldResumeTokenDoc.token : undefined;
let pipeline = _buildPipeline();
if (pipeline[0].$match.$or.length === 0) {
return;
}
//console.log(JSON.stringify(pipeline));
changeStream = dbClient.watch(pipeline);
changeStream.on("change", next => {
_changeStreamLoop(next);
});
changeStream.on("error", async err => {
console.error(err);
if (await _removeResumeTokenAndInit(err) === true) {
process.exit();
}
});
};
exports.initChangeStream = initChangeStream;
const _buildTriggersMap = async function () {
synchronizerModel.getTriggers();
const triggers = await synchronizerModel.getTriggers();
triggersMap = {};
triggers.forEach(trigger => {
triggersMap[trigger.db_name] = triggersMap[trigger.db_name] || {};
triggersMap[trigger.db_name][trigger.dependent_collection] = triggersMap[trigger.db_name][trigger.dependent_collection] || [];
if (Array.isArray(trigger.trigger_fields)) {
trigger.trigger_fields_set = new Set(trigger.trigger_fields);
}
triggersMap[trigger.db_name][trigger.dependent_collection].push(trigger);
});
};
exports.addTrigger = async function (body) {
let result;
const payload = {
db_name: body.dbName,
dependent_collection: body.dependentCollection,
trigger_type: body.triggerType,
trigger_fields: body.triggerFields,
knowledge: body.knowledge,
url: body.url
};
const {error, value} = synchronizerModel.validateTrigger(payload);
if (error) {
throw new Error(error);
}
try {
result = await synchronizerModel.addTrigger(value);
} catch (e) {
if (e.code === 11000) { // duplicate key error
result = await synchronizerModel.getTriggerIdByAllFields(value);
return result._id;
}
throw e;
}
await _buildTriggersMap();
await initChangeStream();
return result.insertedId;
};
exports.removeTrigger = async function (id) {
const result = await synchronizerModel.removeTrigger(id);
if (result.n > 0) {
await _buildTriggersMap();
await initChangeStream();
}
};
const _removeResumeTokenAndInit = async function (err) {
if (changeStreamErrors.includes(err.code)) {
changeStream = undefined;
await synchronizerModel.removeResumeToken("trigger");
await initChangeStream();
return false;
}
return true;
};
const _buildPipeline = function () {
const $or = [];
const $match = {$or};
const pipeline = [
{$match}
];
const fields = new Set();
Object.keys(triggersMap).forEach(dbName => {
Object.keys(triggersMap[dbName]).forEach(collName => {
const operations = new Set();
triggersMap[dbName][collName].forEach(trigger => {
operations.add(trigger.trigger_type);
[...trigger.trigger_fields_set].forEach(field => fields.add("updateDescription.updatedFields." + field));
});
$or.push({"ns.db": dbName, "ns.coll": collName, operationType: {$in: [...operations]}});
});
});
const project = {documentKey: 1, updateDescription: 1, operationType: 1, ns: 1};
pipeline.push({
$project: project
});
if (fields.size > 0) {
const fieldsMatch = [...fields].map(field => ({[field]: {$exists: true}}));
pipeline.push({$match: {$or: fieldsMatch}});
}
return pipeline;
};
const _fireTriggers = function ({ns, documentKey, operationType, updateDescription}) {
//console.log(updateDescription, "updateDescription");
if (!triggersMap[ns.db] || !triggersMap[ns.db][ns.coll]) {
return;
}
for (let i in triggersMap[ns.db][ns.coll]) {
if (triggersMap[ns.db][ns.coll][i].trigger_type !== operationType) {
continue;
}
if (triggersMap[ns.db][ns.coll][i].trigger_type === "update") {
_triggerUpdateOperation(triggersMap[ns.db][ns.coll][i], documentKey, updateDescription);
continue;
}
triggerDeleteInsertReplaceOperation(triggersMap[ns.db][ns.coll][i], documentKey, operationType);
}
};
const _triggerUpdateOperation = function (trigger, documentKey, updateDescription) {
const fields = {...updateDescription.updatedFields};
let needToTrigger = false;
for (const field in updateDescription.updatedFields) {
if (trigger.trigger_fields_set.has(field)) {
needToTrigger = true;
}
}
if (needToTrigger) {
fields.documentKey = documentKey;
fields.operationType = "update";
axios.post(trigger.url, fields).catch(response => _failedTrigger(trigger, fields, response));
}
};
const _failedTrigger = (trigger, fields, response) => {
if (trigger.knowledge === true && (!response || response.response.status !== 404)) {
synchronizerModel.enqueueTrigger(trigger.url, fields);
}
};
const triggerDeleteInsertReplaceOperation = function (trigger, documentKey, operationType) {
const fields = {documentKey, operationType};
axios.post(trigger.url, fields).catch(response => _failedTrigger(trigger, fields, response));
};
const _changeStreamLoop = async function (next) {
if (!next || !next._id) {
return;
}
try {
await synchronizerModel.addResumeToken({token: next._id}, "trigger");
await _fireTriggers(next);
} catch (e) {
console.error(e);
}
};