Use DescribeInstance to retrieve filtered AWS instances

[trjstewart]

Proposed changes

This is an initial implementation to satisfy the minimum requirements of issue #28. It would also close out #6.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto master
• I will ensure my PR is targeting the master branch and pulling from my branch from my own fork

[trjstewart]

no tests were added as this initial implementation doesn't change the interface for the config file.
also closes PR #6.
refer to issue #29 for further comments.

[pleshakov]

@trjstewart thanks for the PR!

Please see a few suggestions.

We will do some additional testing and let you know if we find any problems.

[trjstewart]

Thanks for the suggestions @pleshakov. I've fixed those few things up.

[Rulox]

lgtm. 🚀

We just need to run some tests and this will be ready.

PS: @pleshakov we need to make a release too, we should wait til this is merged right?

Thanks!

[pleshakov]

@trjstewart thanks! the changes look good. we'll finish the testing shortly and merge it.

@Rulox yep, we'll include this feature into a new release.

For the new release, we're also planning to include support for upstream servers parameter (max_fails, max_conns, fail_timeout, slow_start), which we're currently working on.

[trjstewart]

@pleshakov do you have an ETA on getting the new release out? Just trying to decide if I want to build the binary myself and put it on our CDN or wait.

[pleshakov]

@trjstewart the ETA is 2 weeks.

[trjstewart]

@pleshakov I'd be happy to take a look at adding the server parm support if you think that would speed things up and make less work for you guys?

[Rulox]

@trjstewart thanks for your help! We really appreciate it.

I am not sure if the release date can be earlier regarding the time the new features are available (we have the team working on these features already). @pleshakov maybe you have more insights on this?

In the meantime, this PR is good to go, so merging it now!

[pleshakov]

@trjstewart as Raul mentioned, we're already working on the feature. thanks for your help.

[Rulox]

@trjstewart If you are still interested in this, this feature (upstream parameters) has been rolled out on the 0.4-1 version, sorry for the delay.