Security News
ESLint is Now Language-Agnostic: Linting JSON, Markdown, and Beyond
ESLint has added JSON and Markdown linting support with new officially-supported plugins, expanding its versatility beyond JavaScript.
log4js-cloudwatch-appender
Advanced tools
Simple appender for log4js to submit logs to AWS cloudwatch based on the lawgs module.
This module is installed via npm:
npm install --save log4js-cloudwatch-appender
Add aws appender to the log4js config file:
const config = {
appenders: {
aws: {
type: "log4js-cloudwatch-appender",
accessKeyId: '<accessKeyId>',
secretAccessKey: '<secretAccessKey>',
region: 'eu-central-1',
logGroup: 'prod',
logStream: 'apps',
layout: '<custom layout object>',
lawgsConfig: '<optional alwgs config object>'
}
},
categories: {
default: {appenders: ['aws'], level: 'info'}
}
}
This will cause logs to be sent to AWS CloudWatch with the specified group and stream.
If you are using roles, you will need the following roles:
region
- The CloudWatch regionlogGroup
- The log group to send the metrics tologStream
- The log stream of the group to send the metrics toaccessKeyId
- Optional if credentials are set in ~/.aws/credentials
secretAccessKey
- Optional if credentials are set in ~/.aws/credentials
layout
- Custom layout. See suggested layoutlawgsConfig
- Optional vonfig object for lawgs:
showDebugLogs
- Show debug logs. Default: false.uploadMaxTimer
- After this ms timeout, flush to server. Default: 5000.uploadBatchSize
- After this amount of logs, flush to server. Default: 500.Logs are easier to query whn they are formatted as json. Following is a suggested json layout to set for this appender. The logging style should be:
const uuid = require('node-uuid');
const corr = uuid.v4();
const logger = logFactory.getLogger('category');
logger.info(corr, 'methodName()','part1','part2');
Which will output:
{
"timestamp": "2017-06-10T11:55:38.251Z",
"corr": "2e2c99aa-7eee-4fd2-ae36-cd9dc9533816",
"app": "<appName>",
"host": "<ip>",
"pid": 24532,
"level": "INFO",
"category": "category",
"method": "methodName()",
"message": "part1 part2"
}
The layout:
const util = require('util');
const _ = require('underscore');
let processName = path.basename(process.argv[1]);
processName = processName.substring(0, processName.length - 3);
const publicIp = require('public-ip').v4;
let ip = '';
publicIp()
.then(function (_ip) {
ip = _ip;
})
.catch(function (e) {
console.log(e);
ip = 'unknown';
});
const jsonLayout = {
"type": "pattern",
"pattern": '{"timestamp": "%d{yyyy-MM-ddThh:mm:ss.SSSZ}", "app": "' + processName + '", "ip": "%x{my_ip}", "host": "%h", "pid": %z, "level": "%p", "category": "%c"%x{corr}%x{method}, "message": "%x{message}"}',
"tokens": {
"my_ip": function () {
return ip;
},
"corr": function (logEvent) {
logEvent.__data__ = _.map(logEvent.data, _.clone);
if (logEvent.__data__) {
let corr = logEvent.__data__[0];
if (Array.isArray(corr) && corr.length === 2) {
corr = corr[0];
if (typeof corr === 'string' && corr.length === 36 && corr.split("-").length === 5) {
logEvent.__data__[0] = logEvent.__data__[0][1];
return ', "corr": "' + corr + '"';
}
}
if (logEvent.__data__.length > 1 && corr && typeof corr === 'string' && corr.length === 36 && corr.split("-").length === 5) {
logEvent.__data__.shift();
return ', "corr": "' + corr + '"';
}
}
return '';
},
"method": function (logEvent) {
if (logEvent.__data__) {
const method = logEvent.__data__[0];
if (logEvent.__data__.length > 1 && method && typeof method === 'string' && method.indexOf("()", method.length - 2) !== -1) {
logEvent.__data__.shift();
return ', "method": "' + method + '"';
}
}
return '';
},
"message": function (logEvent) {
if (logEvent.__data__) {
let data = logEvent.__data__;
data = util.format.apply(util, wrapErrorsWithInspect(data));
data = escapedStringify(data);
logEvent.__data__ = undefined;
return data;
}
return '';
}
}
};
function wrapErrorsWithInspect(items) {
return items.map(function (item) {
if ((item instanceof Error) && item.stack) {
return {
inspect: function () {
return util.format(item) + '\n' + item.stack;
}
};
} else {
return item;
}
});
}
function escapedStringify(json) {
return json
.replace(/[\\]/g, '\\\\')
.replace(/[\"]/g, '\\\"')
.replace(/[\/]/g, '\\/')
.replace(/[\b]/g, '\\b')
.replace(/[\f]/g, '\\f')
.replace(/[\n]/g, '\\n')
.replace(/[\r]/g, '\\r')
.replace(/[\t]/g, '\\t');
}
Please make all pull requests to the master
branch and ensure tests pass
locally.
FAQs
log4js aws cloudwatch appender
We found that log4js-cloudwatch-appender demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
ESLint has added JSON and Markdown linting support with new officially-supported plugins, expanding its versatility beyond JavaScript.
Security News
Members Hub is conducting large-scale campaigns to artificially boost Discord server metrics, undermining community trust and platform integrity.
Security News
NIST has failed to meet its self-imposed deadline of clearing the NVD's backlog by the end of the fiscal year. Meanwhile, CVE's awaiting analysis have increased by 33% since June.