The AWS-lib Node module may encounter issues with its signature if called multiple times

Question

The AWS-lib Node module may encounter issues with its signature if called multiple times

I have a script that is constantly checking for the status of an EC2 instance as it starts up.

var checkInstanceStatus = function() {
  console.log('Checking status');
  ec2.call("DescribeInstanceStatus", {InstanceId:['pretend_instance_id']}, function(error, result){
    if (error) {
      console.log('Error occurred')
      console.log(error)
      console.log(result)
    } else {
      console.log('Success')
    }
  }); 
}

var intervalChecker = setInterval( checkInstanceStatus, 5 * 1000)

The initial API call succeeds without any issues, but subsequent calls are failing with:

The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.

How can I resolve this issue and ensure that the repeated API calls work properly?

node.js amazon-ec2 amazon-web-services aws-lib

Answer 1

Answer №1

To potentially resolve the issue, consider specifying an API version when creating an agent. This can be done as follows:

var ec2 = aws.createEC2Client(yourAccessKeyId, yourSecretAccessKey, {
        version: "2012-04-01"
    }
);

I attempted to run your code but did not encounter the same error. Without specifying the API version, I received an 'InvalidAction' response. Below is the snippet of code that I tested:

var aws = require("aws-lib");
var ec2 = aws.createEC2Client("xXx", "yYy", {
    secure: "https",
    host: "ec2.eu-west-1.amazonaws.com",
    version: "2012-04-01"
}
);
var check_started = function() {
console.log('Calling');
ec2.call("DescribeInstanceStatus", {InstanceId:["i-abcdefg"]}, function(err, status_result) {
    if (err) {
      console.log('error')
      console.log(err)
      console.log(status_result)
    } else {
      console.log('success')
      console.log(status_result.instanceStatusSet)
      clearInterval(instance_started_checker);
    }
});
}
var instance_started_checker = setInterval( check_started, 5 * 1000);

Just out of curiosity, are you encountering the same issue when invoking DescribeInstances?

Answer 2

To potentially resolve the issue, consider specifying an API version when creating an agent. This can be done as follows:

var ec2 = aws.createEC2Client(yourAccessKeyId, yourSecretAccessKey, {
        version: "2012-04-01"
    }
);

I attempted to run your code but did not encounter the same error. Without specifying the API version, I received an 'InvalidAction' response. Below is the snippet of code that I tested:

var aws = require("aws-lib");
var ec2 = aws.createEC2Client("xXx", "yYy", {
    secure: "https",
    host: "ec2.eu-west-1.amazonaws.com",
    version: "2012-04-01"
}
);
var check_started = function() {
console.log('Calling');
ec2.call("DescribeInstanceStatus", {InstanceId:["i-abcdefg"]}, function(err, status_result) {
    if (err) {
      console.log('error')
      console.log(err)
      console.log(status_result)
    } else {
      console.log('success')
      console.log(status_result.instanceStatusSet)
      clearInterval(instance_started_checker);
    }
});
}
var instance_started_checker = setInterval( check_started, 5 * 1000);

Just out of curiosity, are you encountering the same issue when invoking DescribeInstances?

The AWS-lib Node module may encounter issues with its signature if called multiple times

Answer №1

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