// snippet-end:[ec2.dotnet.spot_instance_request_spot_instance]
// snippet-start:[ec2.dotnet.spot_instance_get_spot_request_state]
/* Gets the state of a spot instance request.
* Takes two args:
* AmazonEC2Client ec2Client is the EC2 client through which information about the state of the spot instance is made
* string spotRequestId is the ID of the spot instance
*
* See https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/MEC2DescribeSpotInstanceRequests.html
*/
private static SpotInstanceState GetSpotRequestState(
AmazonEC2Client ec2Client,
string spotRequestId)
{
// Create the describeRequest object with all of the request ids
// to monitor (e.g. that we started).
var request = new DescribeSpotInstanceRequestsRequest();
request.SpotInstanceRequestIds.Add(spotRequestId);
// Retrieve the request we want to monitor.
var describeResponse = ec2Client.DescribeSpotInstanceRequestsAsync(request);
SpotInstanceRequest req = describeResponse.Result.SpotInstanceRequests[0];
return(req.State);
}
private async Task WaitAndTry(SpotInstanceRequest spotRequest)
{
for (int i = 1; i <= 6; i++)
{
await Task.Delay(10000);
var getSpotInstanceRequest = SpotInstanceRequest.Get($"get-spot-instance-{i}", spotRequest.Id, null, new CustomResourceOptions {
DependsOn = spotRequest
});
Console.WriteLine($"SpotInstanceId from GET request: {getSpotInstanceRequest.SpotInstanceId}");
Console.WriteLine($"SpotInstanceId from GET request: {getSpotInstanceRequest.SpotInstanceId.ToString()}");
Console.WriteLine($"SpotInstanceId from GET request: {getSpotInstanceRequest.SpotInstanceId.Apply(x => x)}");
Console.WriteLine($"SpotInstanceId from GET request: {getSpotInstanceRequest.SpotInstanceId.Apply(x => x.ToString())}");
Console.WriteLine($"SpotInstanceId from GET request: {getSpotInstanceRequest.SpotInstanceId.Apply(x => x).ToString()}");
//If I could actually get the SpotInstanceId here, I would be able to invoke the AWS SDK here to add tags to that instance?
}
}
public async Task <string> FunctionHandler(Dictionary <string, string> input, ILambdaContext context)
{
// More AMI IDs: aws.amazon.com/amazon-linux-2/release-notes/
// us-east-2 HVM EBS-Backed 64-bit Amazon Linux 2
string ami = "ami-09d9edae5eb90d556";
string sg = "default";
// docs.aws.amazon.com/sdkfornet/v3/apidocs/items/EC2/TInstanceType.html
InstanceType type = InstanceType.T3aNano;
string price = "0.003";
int count = 1;
var requestSpotInstances = await RequestSpotInstance(ami, sg, type, price, count);
var spotRequestId = requestSpotInstances.SpotInstanceRequests[0].SpotInstanceRequestId;
Console.WriteLine(spotRequestId);
string instanceId;
while (true)
{
SpotInstanceRequest spotRequest = await GetSpotRequest(spotRequestId);
Console.WriteLine(spotRequest.State);
if (spotRequest.State == SpotInstanceState.Active)
{
instanceId = spotRequest.InstanceId;
break;
}
}
var cancelRequest = CancelSpotRequest(spotRequestId);
var terminateRequest = TerminateSpotInstance(instanceId);
await Task.WhenAll(cancelRequest, terminateRequest);
Console.WriteLine("Complete");
return(spotRequestId);
}
/* Creates, cancels, and terminates a spot instance request
* See Usage() for information about the command-line args
*/
static void Main(string[] args)
{
// Values that aren't easy to pass on the command line
RegionEndpoint region = RegionEndpoint.USWest2;
InstanceType instanceType = InstanceType.T1Micro;
// Default values for optional command-line args
string securityGroupName = "default";
string spotPrice = "0.003";
int instanceCount = 1;
// Placeholder for the only required command-line arg
string amiId = "";
// Parse command-line args
int i = 0;
while (i < args.Length)
{
switch (args[i])
{
case "-s":
i++;
securityGroupName = args[i];
if (securityGroupName == "")
{
Console.WriteLine("The security group name cannot be blank");
Usage();
return;
}
break;
case "-p":
i++;
spotPrice = args[i];
double price;
double.TryParse(spotPrice, out price);
if (price < 0.001)
{
Console.WriteLine("The spot price must be > 0.001");
Usage();
return;
}
break;
case "-c":
i++;
int.TryParse(args[i], out instanceCount);
if (instanceCount < 1)
{
Console.WriteLine("The instance count must be > 0");
Usage();
return;
}
break;
case "-h":
Usage();
return;
default:
amiId = args[i];
break;
}
i++;
}
// Make sure we have an AMI
if (amiId == "")
{
Console.WriteLine("You must supply an AMI");
Usage();
return;
}
AmazonEC2Client ec2Client = new AmazonEC2Client(region: region);
Console.WriteLine("Creating spot instance request");
SpotInstanceRequest req = RequestSpotInstance(ec2Client, amiId, securityGroupName, instanceType, spotPrice, instanceCount);
string id = req.SpotInstanceRequestId;
// Wait for it to become active
Console.WriteLine("Waiting for spot instance request with ID " + id + " to become active");
int wait = 1;
int totalTime = 0;
while (true)
{
totalTime += wait;
Console.Write(".");
SpotInstanceState state = GetSpotRequestState(ec2Client, id);
if (state == SpotInstanceState.Active)
{
Console.WriteLine("");
break;
}
// wait a bit and try again
Thread.Sleep(wait);
// wait longer next time
// 1, 2, 4, ...
wait = wait * 2;
}
// Should be around 1000 (one second)
Console.WriteLine("That took " + totalTime + " milliseconds");
// Cancel the request
Console.WriteLine("Canceling spot instance request");
CancelSpotRequest(ec2Client, id);
// Clean everything up
Console.WriteLine("Terminating spot instance request");
TerminateSpotInstance(ec2Client, id);
Console.WriteLine("Done. Press enter to quit");
Console.ReadLine();
}
