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utils.js
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utils.js
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
var request = require('request');
var HttpStatus = require('http-status-codes');
var lt = require('long-timeout');
var constants = require('./constants.js');
var DateAlarm = require('./dateAlarm.js');
var CronAlarm = require('./cronAlarm.js');
var IntervalAlarm = require('./intervalAlarm.js');
var Sanitizer = require('./sanitizer');
var authHandler = require('./authHandler');
module.exports = function(logger, triggerDB, redisClient) {
var retryDelay = constants.RETRY_DELAY;
var retryAttempts = constants.RETRY_ATTEMPTS;
var filterDDName = constants.FILTERS_DESIGN_DOC;
var viewDDName = constants.VIEWS_DESIGN_DOC;
var triggersByWorker = constants.TRIGGERS_BY_WORKER;
var redisKeyPrefix = process.env.REDIS_KEY_PREFIX || triggerDB.config.db;
var self = this;
this.triggers = {};
this.endpointAuth = process.env.ENDPOINT_AUTH;
this.routerHost = process.env.ROUTER_HOST || 'localhost';
this.worker = process.env.WORKER || 'worker0';
this.host = process.env.HOST_INDEX || 'host0';
this.hostPrefix = this.host.replace(/\d+$/, '');
this.activeHost = `${this.hostPrefix}0`; //default value on init (will be updated for existing redis)
this.db = triggerDB;
this.redisClient = redisClient;
this.redisKey = redisKeyPrefix + '_' + this.worker;
this.redisField = constants.REDIS_FIELD;
this.uriHost ='https://' + this.routerHost;
this.sanitizer = new Sanitizer(logger, this);
this.monitorStatus = {};
function createTrigger(triggerIdentifier, newTrigger) {
var method = 'createTrigger';
var callback = function onTick() {
var triggerHandle = self.triggers[triggerIdentifier];
if (triggerHandle && shouldFireTrigger(triggerHandle) && hasTriggersRemaining(triggerHandle)) {
try {
fireTrigger(triggerHandle);
} catch (e) {
logger.error(method, 'Exception occurred while firing trigger', triggerIdentifier, e);
}
}
};
newTrigger.uri = self.uriHost + '/api/v1/namespaces/' + newTrigger.namespace + '/triggers/' + newTrigger.name;
newTrigger.triggerID = triggerIdentifier;
var alarm;
if (newTrigger.date) {
alarm = new DateAlarm(logger, newTrigger);
}
else if (newTrigger.minutes) {
alarm = new IntervalAlarm(logger, newTrigger);
}
else {
alarm = new CronAlarm(logger, newTrigger);
}
return alarm.scheduleAlarm(triggerIdentifier, callback);
}
function fireTrigger(triggerData) {
var method = 'fireTrigger';
var triggerIdentifier = triggerData.triggerID;
logger.info(method, 'Alarm fired for', triggerIdentifier, 'attempting to fire trigger');
postTrigger(triggerData, 0)
.then(triggerId => {
logger.info(method, 'Trigger', triggerId, 'was successfully fired');
handleFiredTrigger(triggerData);
})
.catch(err => {
logger.error(method, err);
handleFiredTrigger(triggerData);
});
}
function postTrigger(triggerData, retryCount, throttleCount) {
var method = 'postTrigger';
return new Promise(function(resolve, reject) {
// only manage trigger fires if they are not infinite
if (triggerData.maxTriggers && triggerData.maxTriggers !== -1) {
triggerData.triggersLeft--;
}
self.authRequest(triggerData, {
method: 'post',
uri: triggerData.uri,
json: triggerData.payload
}, function(error, response) {
try {
var statusCode = !error ? response.statusCode : error.statusCode;
var triggerIdentifier = triggerData.triggerID;
logger.info(method, triggerIdentifier, 'http post request, STATUS:', statusCode);
if (error || statusCode >= 400) {
logger.error(method, 'there was an error invoking', triggerIdentifier, statusCode || error);
var throttleCounter = throttleCount || 0;
// only manage trigger fires if they are not infinite
if (triggerData.maxTriggers && triggerData.maxTriggers !== -1) {
triggerData.triggersLeft++;
}
if (statusCode && shouldDisableTrigger(statusCode)) {
var message;
try {
message = error.error.errorMessage;
} catch (e) {
message = `Received a ${statusCode} status code when firing the trigger`;
}
disableTrigger(triggerIdentifier, statusCode, `Trigger automatically disabled: ${message}`);
reject(`Disabled trigger ${triggerIdentifier}: ${message}`);
}
else {
if (retryCount < retryAttempts) {
throttleCounter = statusCode === HttpStatus.TOO_MANY_REQUESTS ? throttleCounter + 1 : throttleCounter;
logger.info(method, 'attempting to fire trigger again', triggerIdentifier, 'Retry Count:', (retryCount + 1));
setTimeout(function () {
postTrigger(triggerData, (retryCount + 1), throttleCounter)
.then(triggerId => {
resolve(triggerId);
})
.catch(err => {
reject(err);
});
}, Math.max(retryDelay, 1000 * Math.pow(throttleCounter, 2)));
} else {
if (throttleCounter === retryAttempts) {
var msg = 'Automatically disabled after continuously receiving a 429 status code when firing the trigger';
disableTrigger(triggerIdentifier, 429, msg);
reject('Disabled trigger ' + triggerIdentifier + ' due to status code: 429');
}
else {
reject('Unable to reach server to fire trigger ' + triggerIdentifier);
}
}
}
} else {
logger.info(method, 'fired', triggerIdentifier);
resolve(triggerIdentifier);
}
}
catch(err) {
reject('Exception occurred while firing trigger ' + err);
}
});
});
}
function shouldDisableTrigger(statusCode) {
return ((statusCode >= 400 && statusCode < 500) &&
[HttpStatus.REQUEST_TIMEOUT, HttpStatus.TOO_MANY_REQUESTS, HttpStatus.CONFLICT].indexOf(statusCode) === -1);
}
function shouldFireTrigger(trigger) {
return trigger.monitor || self.activeHost === self.host;
}
function hasTriggersRemaining(trigger) {
return !trigger.maxTriggers || trigger.maxTriggers === -1 || trigger.triggersLeft > 0;
}
function isMonitoringTrigger(monitor, triggerName) {
return monitor && self.monitorStatus.triggerName === triggerName;
}
function handleFiredTrigger(triggerData) {
var method = 'handleFiredTrigger';
if (isMonitoringTrigger(triggerData.monitor, triggerData.name)) {
self.monitorStatus.triggerFired = "success";
}
var triggerIdentifier = triggerData.triggerID;
if (triggerData.date) {
if (triggerData.deleteAfterFire && triggerData.deleteAfterFire !== 'false') {
//delete trigger feed from database
self.sanitizer.deleteTriggerFeed(triggerIdentifier);
//check if trigger and all associated rules should be deleted
if (triggerData.deleteAfterFire === 'rules') {
self.sanitizer.deleteTriggerAndRules(triggerData);
}
else {
self.sanitizer.deleteTrigger(triggerData, 0)
.then(info => {
logger.info(method, triggerIdentifier, info);
})
.catch(err => {
logger.error(method, triggerIdentifier, err);
});
}
}
else {
disableTrigger(triggerIdentifier, undefined, 'Automatically disabled after firing once');
logger.info(method, 'the fire once date has expired, disabled', triggerIdentifier);
}
}
else if (triggerData.stopDate) {
//check if the next scheduled trigger is after the stop date
if (triggerData.cronHandle && triggerData.cronHandle.nextDate().isAfter(new Date(triggerData.stopDate))) {
disableTrigger(triggerIdentifier, undefined, 'Automatically disabled after firing last scheduled cron trigger');
logger.info(method, 'last scheduled cron trigger before stop date, disabled', triggerIdentifier);
}
else if (triggerData.minutes && (Date.now() + (triggerData.minutes * 1000 * 60) > new Date(triggerData.stopDate).getTime())) {
disableTrigger(triggerIdentifier, undefined, 'Automatically disabled after firing last scheduled interval trigger');
logger.info(method, 'last scheduled interval trigger before stop date, disabled', triggerIdentifier);
}
}
else if (triggerData.maxTriggers && triggerData.triggersLeft === 0) {
disableTrigger(triggerIdentifier, undefined, 'Automatically disabled after reaching max triggers');
logger.warn(method, 'no more triggers left, disabled', triggerIdentifier);
}
}
function disableTrigger(triggerIdentifier, statusCode, message) {
var method = 'disableTrigger';
triggerDB.get(triggerIdentifier, function (err, existing) {
if (!err) {
if (!existing.status || existing.status.active === true) {
var updatedTrigger = existing;
var status = {
'active': false,
'dateChanged': Date.now(),
'reason': {'kind': 'AUTO', 'statusCode': statusCode, 'message': message}
};
updatedTrigger.status = status;
triggerDB.insert(updatedTrigger, triggerIdentifier, function (err) {
if (err) {
logger.error(method, 'there was an error while disabling', triggerIdentifier, 'in database.', err);
}
else {
logger.info(method, 'trigger', triggerIdentifier, 'successfully disabled in database');
}
});
}
}
else {
logger.info(method, 'could not find', triggerIdentifier, 'in database');
//make sure it is already stopped
stopTrigger(triggerIdentifier);
}
});
}
function stopTrigger(triggerIdentifier) {
var method = 'stopTrigger';
if (self.triggers[triggerIdentifier]) {
if (self.triggers[triggerIdentifier].cronHandle) {
self.triggers[triggerIdentifier].cronHandle.stop();
}
else if (self.triggers[triggerIdentifier].intervalHandle) {
lt.clearInterval(self.triggers[triggerIdentifier].intervalHandle);
}
delete self.triggers[triggerIdentifier];
logger.info(method, 'trigger', triggerIdentifier, 'successfully deleted from memory');
}
}
this.initAllTriggers = function() {
var method = 'initAllTriggers';
//follow the trigger DB
setupFollow('now');
logger.info(method, 'resetting system from last state');
triggerDB.view(viewDDName, triggersByWorker, {reduce: false, include_docs: true, key: self.worker}, function(err, body) {
if (!err) {
body.rows.forEach(function (trigger) {
var triggerIdentifier = trigger.id;
var doc = trigger.doc;
if (!(triggerIdentifier in self.triggers) && !doc.monitor) {
//check if trigger still exists in whisk db
var namespace = doc.namespace;
var name = doc.name;
var uri = self.uriHost + '/api/v1/namespaces/' + namespace + '/triggers/' + name;
logger.info(method, 'Checking if trigger', triggerIdentifier, 'still exists');
self.authRequest(doc, {
method: 'get',
url: uri
}, function (error, response) {
//disable trigger in database if trigger is dead
if (!error && shouldDisableTrigger(response.statusCode)) {
var message = 'Automatically disabled after receiving a ' + response.statusCode + ' status code on trigger initialization';
disableTrigger(triggerIdentifier, response.statusCode, message);
logger.error(method, 'trigger', triggerIdentifier, 'has been disabled due to status code:', response.statusCode);
}
else {
createTrigger(triggerIdentifier, doc)
.then(cachedTrigger => {
self.triggers[triggerIdentifier] = cachedTrigger;
logger.info(method, triggerIdentifier, 'created successfully');
if (cachedTrigger.intervalHandle && shouldFireTrigger(cachedTrigger)) {
try {
fireTrigger(cachedTrigger);
} catch (e) {
logger.error(method, 'Exception occurred while firing trigger', triggerIdentifier, e);
}
}
})
.catch(err => {
var message = 'Automatically disabled after receiving error on trigger initialization: ' + err;
disableTrigger(triggerIdentifier, undefined, message);
logger.error(method, 'Disabled trigger', triggerIdentifier, err);
});
}
});
}
});
} else {
logger.error(method, 'could not get latest state from database', err);
}
});
};
function setupFollow(seq) {
var method = 'setupFollow';
try {
var feed = triggerDB.follow({
since: seq,
include_docs: true,
filter: filterDDName + '/' + triggersByWorker,
query_params: {worker: self.worker}
});
feed.on('change', (change) => {
var triggerIdentifier = change.id;
var doc = change.doc;
logger.info(method, 'got change for trigger', triggerIdentifier);
if (self.triggers[triggerIdentifier]) {
if (doc.status && doc.status.active === false) {
stopTrigger(triggerIdentifier);
if (isMonitoringTrigger(doc.monitor, doc.name)) {
self.monitorStatus.triggerStopped = "success";
}
}
}
else {
//ignore changes to disabled triggers
if ((!doc.status || doc.status.active === true) && (!doc.monitor || doc.monitor === self.host)) {
createTrigger(triggerIdentifier, doc)
.then(cachedTrigger => {
self.triggers[triggerIdentifier] = cachedTrigger;
logger.info(method, triggerIdentifier, 'created successfully');
if (isMonitoringTrigger(cachedTrigger.monitor, cachedTrigger.name)) {
self.monitorStatus.triggerStarted = "success";
}
if (cachedTrigger.intervalHandle && shouldFireTrigger(cachedTrigger)) {
try {
fireTrigger(cachedTrigger);
} catch (e) {
logger.error(method, 'Exception occurred while firing trigger', triggerIdentifier, e);
}
}
})
.catch(err => {
var message = 'Automatically disabled after receiving error on trigger creation: ' + err;
disableTrigger(triggerIdentifier, undefined, message);
logger.error(method, 'Disabled trigger', triggerIdentifier, err);
});
}
}
});
feed.on('error', function (err) {
logger.error(method, err);
});
feed.follow();
}
catch (err) {
logger.error(method, err);
}
}
this.authorize = function(req, res, next) {
var method = 'authorize';
if (self.endpointAuth) {
if (!req.headers.authorization) {
res.set('www-authenticate', 'Basic realm="Private"');
res.status(HttpStatus.UNAUTHORIZED);
return res.send('');
}
var parts = req.headers.authorization.split(' ');
if (parts[0].toLowerCase() !== 'basic' || !parts[1]) {
return sendError(method, HttpStatus.BAD_REQUEST, 'Malformed request, basic authentication expected', res);
}
var auth = new Buffer(parts[1], 'base64').toString();
auth = auth.match(/^([^:]*):(.*)$/);
if (!auth) {
return sendError(method, HttpStatus.BAD_REQUEST, 'Malformed request, authentication invalid', res);
}
var uuid = auth[1];
var key = auth[2];
var endpointAuth = self.endpointAuth.split(':');
if (endpointAuth[0] === uuid && endpointAuth[1] === key) {
next();
}
else {
logger.warn(method, 'Invalid key');
return sendError(method, HttpStatus.UNAUTHORIZED, 'Invalid key', res);
}
}
else {
next();
}
};
function sendError(method, code, message, res) {
logger.error(method, message);
res.status(code).json({error: message});
}
this.initRedis = function() {
var method = 'initRedis';
return new Promise(function(resolve, reject) {
if (redisClient) {
var subscriber = redisClient.duplicate();
//create a subscriber client that listens for requests to perform swap
subscriber.on('message', function (channel, message) {
logger.info(method, message, 'set to active host in channel', channel);
self.activeHost = message;
});
subscriber.on('error', function (err) {
logger.error(method, 'Error connecting to redis', err);
reject(err);
});
subscriber.subscribe(self.redisKey);
redisClient.hgetAsync(self.redisKey, self.redisField)
.then(activeHost => {
return initActiveHost(activeHost);
})
.then(() => {
process.on('SIGTERM', function onSigterm() {
if (self.activeHost === self.host) {
var redundantHost = self.host === `${self.hostPrefix}0` ? `${self.hostPrefix}1` : `${self.hostPrefix}0`;
self.redisClient.hsetAsync(self.redisKey, self.redisField, redundantHost)
.then(() => {
self.redisClient.publish(self.redisKey, redundantHost);
})
.catch(err => {
logger.error(method, err);
});
}
});
resolve();
})
.catch(err => {
reject(err);
});
}
else {
resolve();
}
});
};
function initActiveHost(activeHost) {
var method = 'initActiveHost';
if (activeHost === null) {
//initialize redis key with active host
logger.info(method, 'redis hset', self.redisKey, self.redisField, self.activeHost);
return redisClient.hsetAsync(self.redisKey, self.redisField, self.activeHost);
}
else {
self.activeHost = activeHost;
return Promise.resolve();
}
}
this.authRequest = function(triggerData, options, cb) {
var method = 'authRequest';
authHandler.handleAuth(triggerData, options)
.then(requestOptions => {
request(requestOptions, cb);
})
.catch(err => {
logger.error(method, err);
cb(err);
});
};
};