feat(cli): add app show support for backend app

[iamhopaul123]

With this change app show now should be able to show running backend applications. However, we cannot test this feature manually until app deploy supports deploying backend app.

Ideally the output for app show for backend app should be:

About

  Project           my-project
  Name              my-app
  Type              Backend App

Configurations

  Environment       Tasks               CPU (vCPU)          Memory (MiB)        Port
  test              1                   0.25                512                 5000
  prod              2                   0.5                 1024                5000

Service Discovery:

  test,prod         my-app.my-project.local:5000

Variables

  Name              Environment         Value

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[kohidave]

Can we remove the http from the service discovery endpoint?

[efekarakus]

However, we cannot test this feature manually until app deploy supports deploying backend app.

I'll pull your branch and test it with my WIP app deploy branch and report back :D

[efekarakus]

Your command works!

$ ecs-preview app show
? Which application of phonetool would you like to show? rindex
About

  Project           phonetool
  Name              rindex
  Type              Backend App

Configurations

  Environment       Tasks               CPU (vCPU)          Memory (MiB)        Port
  test              1                   0.25                512                 80

Service Discovery

  Environment       Namespace
  test              http://rindex.phonetool.local:80

Variables

  Name                        Environment         Value
  ECS_APP_DISCOVERY_ENDPOINT  test                phonetool.local
  ECS_CLI_APP_NAME            test                rindex
  ECS_CLI_ENVIRONMENT_NAME    test                test
  ECS_CLI_LB_DNS              test                phone-Publi-1B334QZ3UBM1Y-1538761958.us-west-2.elb.amazonaws.com
  ECS_CLI_PROJECT_NAME        test                phonetool

[iamhopaul123]

Your command works!

$ ecs-preview app show
? Which application of phonetool would you like to show? rindex
About

  Project           phonetool
  Name              rindex
  Type              Backend App

Configurations

  Environment       Tasks               CPU (vCPU)          Memory (MiB)        Port
  test              1                   0.25                512                 80

Service Discovery

  Environment       Namespace
  test              http://rindex.phonetool.local:80

Variables

  Name                        Environment         Value
  ECS_APP_DISCOVERY_ENDPOINT  test                phonetool.local
  ECS_CLI_APP_NAME            test                rindex
  ECS_CLI_ENVIRONMENT_NAME    test                test
  ECS_CLI_LB_DNS              test                phone-Publi-1B334QZ3UBM1Y-1538761958.us-west-2.elb.amazonaws.com
  ECS_CLI_PROJECT_NAME        test                phonetool

YAY!

[kohidave]

As we add more patterns we might want this to be a describer provider or something that can look up the right functions in a map or something like that - so we don't end up with one giant function. We needn't do it now, but just a note.

[iamhopaul123]

I agree. That's a good idea!