EC2 Dry-Runs

[millems]

In 1.11.x, customers can execute certain EC2 requests as a "dry-run" request. This adds a special header to tell EC2 to not actually execute the request.

Support for this feature should be added in 2.0.

[bgola-signalfx]

Bump. I think it should be a common feature of the SDK applicable to all requests. Otherwise it is difficult to check if we have all the required permissions to execute some task before actually starting the whole process.

[joviegas]

After merging above PR , we can get the dry run status as below

Sync Client

        // Lets consider we want to find the dryRun Status for describeRegions API
        boolean dryRunComplete = isDryRunComplete(() -> ec2Client.describeRegions(r -> r.regionNames(Region.US_EAST_1.id()).dryRun(true)));

    // Write a generic Private API that takes in any EC2 Operation , make sure dryRun flag is set and extract the Error response
    private boolean isDryRunComplete(Supplier<Ec2Response> dryRunOp) {
        Ec2Response ec2Response = null;
        try {
            ec2Response = dryRunOp.get();
        } catch (Ec2Exception exception) {
            AwsErrorDetails awsErrorDetails = exception.awsErrorDetails();
            if ("AuthFailure".equals(awsErrorDetails.errorCode())) {
                return false;
            }
            if ("DryRunOperation".equals(awsErrorDetails.errorCode())) {
                return true;
            }
            throw exception;
        }
        throw new IllegalStateException("Unable to get dryRun status for ec2Response:  " + ec2Response);
    }

Async Client

        Boolean isDryRunComplete = asyncClient.describeRegions(r -> r.regionNames(Region.US_EAST_1.id())
                                                                     .dryRun(true))
                                              .handle((resp, e) -> isDryRunCompleted(e))
                                              .join();

    // Write a generic Private API that gets the DryRun status from the exception
    private static Boolean isDryRunCompleted(Throwable exceptionCaught) {
        if(exceptionCaught.getCause() instanceof Ec2Exception){
            Ec2Exception exception = (Ec2Exception) exceptionCaught.getCause();
            AwsErrorDetails awsErrorDetails = exception.awsErrorDetails();
            if ("AuthFailure".equals(awsErrorDetails.errorCode())) {
                return false;
            }
            if ("DryRunOperation".equals(awsErrorDetails.errorCode())) {
                return true;
            }
        }
        throw new IllegalStateException(exceptionCaught.getCause());
    }

[github-actions]

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