Comments/issues/"um there's totally a module that does exactly this"
welcome. Homepage is here https://github.com/snupi/node-aws-command-stack
I've been working a lot recently with Amazon's newish VPC (Virtual Private
Cloud) feature. While the AWS management console gives you nice high-level
operations like "Create a VPC with a
public subnet, a private subnet, and an EC2 instance acting as a NAT" the
API is very low level, in fact to produce a similar VPC via the API
requires at least the following (all part of the EC2 api):
createVpc, createInternetGateway, attachInternetGateway, createRoute,
createSubnet, createRouteTable, associateRouteTable, createSubnet,
createSecurityGroup, authorizeSecurityGroupIngress,
authorizeSecurityGroupEgress, runInstances, allocateAddress,
associateAddress, modifyInstanceAttribute, createRoute
Throw in tags and some Route53/DNS work and you're upwards of 20 API calls
just to stand up a bare-bones VPC. Naturally debugging this required
creating and thus cleaning up a whole ton of these. Most of the steps
depend on earlier steps, e.g. you can't create the NAT instance until you
create the subnet, you can't create the subnet until you create the VPC,
etc., and the inverse applies when destroying objects. Because the AWS
API's are so uniform in calling form it worked out well to create a simple
stack that I could push operations onto, this module is an extraction of
just that bit. I plan on releasing the higher level create/view/destroy
VPC operations as a module as well once I have time to extract the company
specific logic that's in there.
For illustration here's some code from the included sample (error handling
left out for brevity), this finds all the VPCs in a given region and prints
their subnets and instances. (The stack approach isn't particularly
relevant here, but the 'destroy a cloud' operation that birthed it is too
long fit here).
var aws = new AWSCommandStack("EC2", {
accessKeyId: 'yourAccessKeyId',
secretAccessKey: 'yourSecretAccessKey',
region: region
}}).on("end", function () {
process.exit(0);
});
aws.push("EC2.describeVpcs", { }, function (error, data) {
console.log("%s: found %d Vpcs", region, data.Vpcs.length);
data.Vpcs.forEach(function (Vpc) {
aws.push("EC2.describeSubnets", { Filters: [{ Name: "vpc-id", Values: [
Vpc.VpcId ] }]}, function (error, data) {
console.log(" %s %s", Vpc.VpcId, Vpc.CidrBlock));
data.Subnets.forEach(function (Subnet) {
aws.push("EC2.describeInstances", { Filters: [{ Name: "subnet-id",
Values: [ Subnet.SubnetId ] }]}, function (error, data) {
console.log(" %s %s", Subnet.SubnetId, Subnet.CidrBlock);
data.Reservations.forEach(function (Reservation) {
Reservation.Instances.forEach(function (Instance) {
console.log(" %s %s %s", Instance.InstanceId,
Instance.PrivateIpAddress, Instance.PublicIpAddress));
});
});
aws.done();
});
});
aws.done();
});
});
aws.done();
});
aws.run();
Which will output something like:
us-west-2: found 1 Vpcs
vpc-71cbe109 10.0.0.0/16
subnet-79cbe110 10.0.1.0/24
subnet-7adbe112 10.0.0.0/24
i-ea57cefd 10.0.0.162 54.213.18.102
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