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index.js
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index.js
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// JavaScript source code
var AWS = require('aws-sdk')
, Q = require('q')
, request = require('request');
var counter = 0;
var metricDataQueriesDict = {};
//loggly url, token and tag configuration
//user need to edit while uploading code via blueprint
var logglyConfiguration = {
url: 'http://logs-01.loggly.com/bulk',
tags: 'CloudwatchMetrics'
};
var kms = new AWS.KMS({
apiVersion: '2014-11-01'
});
var cloudwatch = new AWS.CloudWatch({
apiVersion: '2010-08-01'
});
//entry point
exports.handler = function (event, context) {
var parsedStatistics = [];
var nowDate = new Date();
var date = nowDate.getTime();
//time up to which we want to fetch Metrics Statistics
//we keep it one hour
var logEndTime = nowDate.toISOString();
//time from which we want to fetch Metrics Statistics
var logStartTime = new Date(date - (05 * 60 * 1000)).toISOString();
//initiate the script here
decryptLogglyToken().then(function () {
getMetricsListFromAWSCloudwatch().then(function () {
sendRemainingStatistics().then(function () {
context.done();
}, function () {
context.done();
});
}, function () {
context.done();
});
}, function (reason) {
context.done(reason);
});
//decrypts your Loggly Token from your KMS key
function decryptLogglyToken() {
return Q.Promise(function (resolve, reject) {
if (!process.env.kmsEncryptedCustomerToken) {
reject("Environment variable 'kmsEncryptedCustomerToken' is not defined. Define 'kmsEncryptedCustomerToken' "
+ "environment variable and set it to KMS encrypted customer token for Loggly.");
}
var functionName = process.env.AWS_LAMBDA_FUNCTION_NAME;
var encryptedLogglyTokenBuffer = Buffer.from(process.env.kmsEncryptedCustomerToken, "base64");
var params = {
CiphertextBlob: encryptedLogglyTokenBuffer,
EncryptionContext: { LambdaFunctionName: functionName }
};
kms.decrypt(params, function (err, data) {
if (err) {
console.log(err, err.stack); // an error occurred
reject();
}
else {
// successful response
logglyConfiguration.customerToken = data.Plaintext.toString('ascii');
resolve();
}
});
});
}
//retreives all list of valid metrics from cloudwatch
function getMetricsListFromAWSCloudwatch() {
return Q.Promise(function (resolve, reject) {
var promisesResult = [];
var getMetricsList = function (nextToken) {
// Remove Coments if requierd filter
var params = {
/*
// Add filter dimensions
// Remove Coments if requierd filter
Dimensions: [{
// Required
Name:"String_Value" ,
Value:""
},
],
//Add Metric name : ["CPUUtilization","DiskReadOps","StatusCheckFailed_System"] -> String Values
MetricName:"String Value"
// more filters
*/
};
//The token returned by a previous call to indicate that there is more data available
//if nextToken returned then next token should
//present to get the Metrics from next page
if (nextToken != null) {
params.NextToken = nextToken;
}
cloudwatch.listMetrics(params, function (err, result) {
if (err) {
console.log(err, err.stack); // an error occurred
}
else {
var pMetricName, pNamespace, pName, pValue;
var queries = [];
for (var i = 0; i < result.Metrics.length; i++) {
pNamespace = result.Metrics[i].Namespace;
pMetricName = result.Metrics[i].MetricName;
for (var j = 0; j < result.Metrics[i].Dimensions.length; j++) {
pName = result.Metrics[i].Dimensions[j].Name
pValue = result.Metrics[i].Dimensions[j].Value
if (!pName || !pValue) continue;
queries.push({metricName: pMetricName, namespace: pNamespace, name: pName, value: pValue});
if (queries.length == 20) {
var promise = fetchMetricDataFromMetrics(queries);
promisesResult.push(promise);
queries = [];
}
}
}
if (queries.length > 0) {
var promise = fetchMetricDataFromMetrics(queries);
promisesResult.push(promise);
queries = [];
}
}
if (result.NextToken) {
getMetricsList(result.NextToken);
}
else {
Q.allSettled(promisesResult)
.then(function () {
resolve();
}, function () {
reject();
});
}
});
}
getMetricsList();
});
}
function getMetricDataQuery(query, stat, id) {
return {
Id: id,
MetricStat: {
Metric: {
Namespace: query.namespace,
MetricName: query.metricName,
Dimensions: [{
Name: query.name,
Value: query.value
}]
},
Period: 60,
Stat: stat
}
};
}
function fetchMetricDataFromMetrics(queries) {
return Q.Promise(function (resolve, reject) {
/*The maximum number of data points returned from a single GetMetricStatistics request is 1,440,
wereas the maximum number of data points that can be queried is 50,850. If you make a request
that generates more than 1,440 data points, Amazon CloudWatch returns an error. In such a case,
you can alter the request by narrowing the specified time range or increasing the specified period.
Alternatively, you can make multiple requests across adjacent time ranges.*/
var metricDataQueries = [];
for (var q in queries) {
var id = 'm' + counter;
metricDataQueriesDict[id] = queries[q];
metricDataQueries.push(getMetricDataQuery(queries[q], 'Average', id + '_average'));
metricDataQueries.push(getMetricDataQuery(queries[q], 'Minimum', id + '_minimum'));
metricDataQueries.push(getMetricDataQuery(queries[q], 'Maximum', id + '_maximum'));
metricDataQueries.push(getMetricDataQuery(queries[q], 'SampleCount', id + '_samplecount'));
metricDataQueries.push(getMetricDataQuery(queries[q], 'Sum', id + '_sum'));
counter++;
}
var params = {
EndTime: logEndTime, //required
StartTime: logStartTime, //required
MetricDataQueries: metricDataQueries
};
function fetch(params, nextToken) {
if (nextToken != null) {
params.NextToken = nextToken;
}
var promises = [];
try {
cloudwatch.getMetricData(params, function (err, data) {
if (err) {
console.log(err, err.stack); // an error occurred
}
else {
var resultsByStat = {}
for (var a in data.MetricDataResults) {
var metricId = data.MetricDataResults[a].Id;
var parts = metricId.split('_');
resultsByStat[parts[0]] = resultsByStat[parts[0]] || {};
resultsByStat[parts[0]][parts[1]] = data.MetricDataResults[a];
}
for (var id in resultsByStat) {
for (var i in resultsByStat[id]['average'].Timestamps) {
var timestamp = resultsByStat[id]['average'].Timestamps[i];
var average = resultsByStat[id]['average'].Values[i];
var minimum = resultsByStat[id]['minimum'].Values[i];
var maximum = resultsByStat[id]['maximum'].Values[i];
var samplecount = resultsByStat[id]['samplecount'].Values[i];
var sum = resultsByStat[id]['sum'].Values[i];
var promise = parseStatistics(timestamp, average, minimum, maximum, samplecount, sum,
metricDataQueriesDict[id].metricName,
metricDataQueriesDict[id].name,
metricDataQueriesDict[id].value,
metricDataQueriesDict[id].namespace)
promises.push(promise);
}
}
Q.allSettled(promises).then(function () {
resolve();
}, function () {
reject();
});
}
if (data.NextToken) {
fetch(params, data.NextToken);
}
});
}
catch (e) {
console.log(e);
}
}
fetch(params);
});
}
//converts the Statistics to a valid JSON object with the sufficient infomation required
function parseStatistics(timestamp, average, minimum, maximum, samplecount, sum, metricName, dimensionName,
dimensionValue, namespace) {
return Q.promise(function (resolve, reject) {
var staticdata = {
"timestamp": timestamp.toISOString(),
"sampleCount": samplecount,
"average": average,
"sum": sum,
"minimum": minimum,
"maximum": maximum,
"metricName": metricName,
"namespace": namespace
};
staticdata[firstToLowerCase(dimensionName)] = dimensionValue;
postStatisticsToLoggly(staticdata).then(function () {
resolve();
}, function () {
reject();
});
});
}
//uploads the statistics to Loggly
//we will hold the statistics in an array until they reaches to 200
//then set the count of zero.
function postStatisticsToLoggly(event) {
return Q.promise(function (resolve, reject) {
if (parsedStatistics.length == 200) {
upload().then(function () {
resolve();
}, function () {
reject();
});
} else {
parsedStatistics.push(event);
resolve();
}
});
}
//checks if any more statistics are left
//after sending Statistics in multiples of 100
function sendRemainingStatistics() {
return Q.promise(function (resolve, reject) {
if (parsedStatistics.length > 0) {
upload().then(function () {
resolve();
}, function () {
reject();
});
} else {
resolve();
}
});
}
function upload() {
return Q.promise(function (resolve, reject) {
//get all the Statistics, stringify them and join them
//with the new line character which can be sent to Loggly
//via bulk endpoint
var finalResult = parsedStatistics.map(JSON.stringify).join('\n');
//empty the main statistics array immediately to hold new statistics
parsedStatistics.length = 0;
//creating logglyURL at runtime, so that user can change the tag or customer token in the go
//by modifying the current script
var logglyURL = logglyConfiguration.url + '/' + logglyConfiguration.customerToken + '/tag/' + logglyConfiguration.tags;
//create request options to send Statistics
try {
var requestOptions = {
uri: logglyURL,
method: 'POST',
headers: {}
};
requestOptions.body = finalResult;
//now send the Statistics to Loggly
request(requestOptions, function (err, response, body) {
if (err) {
console.log('Error while uploading Statistics to Loggly', err);
reject();
} else {
resolve();
}
});
} catch (ex) {
console.log(ex.message);
reject();
}
});
}
//function to convert the first letter of the string to lowercase
function firstToLowerCase(str) {
return str.substr(0, 1).toLowerCase() + str.substr(1);
}
}