/** * Check that the AMI requested is available in the cloud and can be used. */
public FormValidation doValidateAmi(
@QueryParameter boolean useInstanceProfileForCredentials,
@QueryParameter String credentialsId,
@QueryParameter String ec2endpoint,
@QueryParameter String region,
final @QueryParameter String ami)
throws IOException {
AWSCredentialsProvider credentialsProvider =
EC2Cloud.createCredentialsProvider(useInstanceProfileForCredentials, credentialsId);
AmazonEC2 ec2;
if (region != null) {
ec2 = EC2Cloud.connect(credentialsProvider, AmazonEC2Cloud.getEc2EndpointUrl(region));
} else {
ec2 = EC2Cloud.connect(credentialsProvider, new URL(ec2endpoint));
}
if (ec2 != null) {
try {
List<String> images = new LinkedList<String>();
images.add(ami);
List<String> owners = new LinkedList<String>();
List<String> users = new LinkedList<String>();
DescribeImagesRequest request = new DescribeImagesRequest();
request.setImageIds(images);
request.setOwners(owners);
request.setExecutableUsers(users);
List<Image> img = ec2.describeImages(request).getImages();
if (img == null || img.isEmpty()) {
// de-registered AMI causes an empty list to be
// returned. so be defensive
// against other possibilities
return FormValidation.error("No such AMI, or not usable with this accessId: " + ami);
}
String ownerAlias = img.get(0).getImageOwnerAlias();
return FormValidation.ok(
img.get(0).getImageLocation() + (ownerAlias != null ? " by " + ownerAlias : ""));
} catch (AmazonClientException e) {
return FormValidation.error(e.getMessage());
}
} else return FormValidation.ok(); // can't test
}
/*
* Check the current Spot price of the selected instance type for the selected region
*/
public FormValidation doCurrentSpotPrice(
@QueryParameter boolean useInstanceProfileForCredentials,
@QueryParameter String credentialsId,
@QueryParameter String region,
@QueryParameter String type,
@QueryParameter String zone)
throws IOException, ServletException {
String cp = "";
String zoneStr = "";
// Connect to the EC2 cloud with the access id, secret key, and
// region queried from the created cloud
AWSCredentialsProvider credentialsProvider =
EC2Cloud.createCredentialsProvider(useInstanceProfileForCredentials, credentialsId);
AmazonEC2 ec2 =
EC2Cloud.connect(credentialsProvider, AmazonEC2Cloud.getEc2EndpointUrl(region));
if (ec2 != null) {
try {
// Build a new price history request with the currently
// selected type
DescribeSpotPriceHistoryRequest request = new DescribeSpotPriceHistoryRequest();
// If a zone is specified, set the availability zone in the
// request
// Else, proceed with no availability zone which will result
// with the cheapest Spot price
if (getAvailabilityZones(ec2).contains(zone)) {
request.setAvailabilityZone(zone);
zoneStr = zone + " availability zone";
} else {
zoneStr = region + " region";
}
/*
* Iterate through the AWS instance types to see if can find a match for the databound String type.
* This is necessary because the AWS API needs the instance type string formatted a particular way
* to retrieve prices and the form gives us the strings in a different format. For example "T1Micro"
* vs "t1.micro".
*/
InstanceType ec2Type = null;
for (InstanceType it : InstanceType.values()) {
if (it.name().equals(type)) {
ec2Type = it;
break;
}
}
/*
* If the type string cannot be matched with an instance type, throw a Form error
*/
if (ec2Type == null) {
return FormValidation.error("Could not resolve instance type: " + type);
}
Collection<String> instanceType = new ArrayList<String>();
instanceType.add(ec2Type.toString());
request.setInstanceTypes(instanceType);
request.setStartTime(new Date());
// Retrieve the price history request result and store the
// current price
DescribeSpotPriceHistoryResult result = ec2.describeSpotPriceHistory(request);
if (!result.getSpotPriceHistory().isEmpty()) {
SpotPrice currentPrice = result.getSpotPriceHistory().get(0);
cp = currentPrice.getSpotPrice();
}
} catch (AmazonServiceException e) {
return FormValidation.error(e.getMessage());
}
}
/*
* If we could not return the current price of the instance display an error Else, remove the additional
* zeros from the current price and return it to the interface in the form of a message
*/
if (cp.isEmpty()) {
return FormValidation.error("Could not retrieve current Spot price");
} else {
cp = cp.substring(0, cp.length() - 3);
return FormValidation.ok(
"The current Spot price for a " + type + " in the " + zoneStr + " is $" + cp);
}
}