Send AWS Notification to Slack

04 May 2017 . category: sysadmin . Comments
#sysadmin #devops #aws #slack #lambda #SNS #S3 #SES

In this post, we are going to ingrage AWS Lambda with slack to receive importance AWS notification in the slack channel.

Create an incomming webhook in slack

• Step 1: Go to your slack application then click on your team name
• Step 2: You will find a popup menu and click on App and Custom Integrations
• Step 3: You will find the application site of Slack. Type “incomming” in the search box and select Incomming Webhooks
• Step 4: Click add configuration
• Step 5: Post to channel or create new channel in slack then click add incomming webhooks integration
• Step 6: We also can customize name, icon…and all we need is a Webhook URL which will use in Lambda function

Create a SNS topic

• Step 1: Go to the SNS console and create a new topic
• Step 2: Insert name and display name

Create a lambda function which sends the notification to the slack

• Step 1: Go to AWS lambda console and create a lambda function
• Step 2: Choose blank function
• Step 3: Configure triggers, choose SNS service and select SNS topic which we created above
• Step 4: Insert name, description for your lambda function. Select Node.js 6.10 in Runtime
• Step 5: Paste the below code into a lambda function code

var https = require('https');
var util = require('util');

var CHANNEL = "#your channel";
var PATH = "/services/your web hook";

exports.handler = function(event, context) {
    console.log(JSON.stringify(event, null, 2));
    console.log('From SNS:', event.Records[0].Sns.Message);

    var postData = {
        "channel": CHANNEL,
        "username": "AWS Notification on behalf of Harry",
        "text": "*" + event.Records[0].Sns.Subject + "*",
        "icon_emoji": ":bomb:"
    };

    var message = event.Records[0].Sns.Message;
    var severity = "good";

    var dangerMessages = [
        " but with errors",
        " to RED",
        "During an aborted deployment",
        "Failed to deploy application",
        "Failed to deploy configuration",
        "has a dependent object",
        "is not authorized to perform",
        "Pending to Degraded",
        "Stack deletion failed",
        "Unsuccessful command execution",
        "You do not have permission",
        "Your quota allows for 0 more running instance"];

    var warningMessages = [
        " aborted operation.",
        " to YELLOW",
        "Adding instance ",
        "Degraded to Info",
        "Deleting SNS topic",
        "is currently running under desired capacity",
        "Ok to Info",
        "Ok to Warning",
        "Pending Initialization",
        "Removed instance ",
        "Rollback of environment"        
        ];
    
    for(var dangerMessagesItem in dangerMessages) {
        if (message.indexOf(dangerMessages[dangerMessagesItem]) != -1) {
            severity = "danger";
            break;
        }
    }
    
    // Only check for warning messages if necessary
    if (severity == "good") {
        for(var warningMessagesItem in warningMessages) {
            if (message.indexOf(warningMessages[warningMessagesItem]) != -1) {
                severity = "warning";
                break;
            }
        }        
    }

    postData.attachments = [
        {
            "color": severity, 
            "text": message
        }
    ];

    var options = {
        method: 'POST',
        hostname: 'hooks.slack.com',
        port: 443,
        path: PATH
    };

    var req = https.request(options, function(res) {
      res.setEncoding('utf8');
      res.on('data', function (chunk) {
        context.done(null, postData);
      });
    });
    
    req.on('error', function(e) {
      console.log('problem with request: ' + e.message);
    });    

    req.write(util.format("%j", postData));
    req.end();
};

• Step 6: leave Handler set to index.handler. Select Basic Execution Role from the role list and select lambda_basic_execution. After creating the lambda function, you should be taken back to the lambda function list screen.

Test Lambda Function On the lambda function list screen, click on your function and choose edit or test function. Below is an example notification

Cheers

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