New Stack operations #44: isEmpty

[jlr52]

Hi fern4lvarez,

This pull request fixes the code reviews from #65

1. Pull request merging to dev-0.2 instead of master
2. change handler and api name to empty to conform naming convention
3. Implement Empty function in stack.go
4. Enforce 100% code test coverage.
5. Allow maintainer to edit pull request.

Description:

Added isEmpty functionality to api. Now client can access is_empty rest call to
determine if the stack associated to the pass in stack id and db id is empty or not.

Testing Methodology:

Verify the following curl call will return is_empty = false

    curl -XPUT "localhost:1205/databases?name=MY_DATABASE"
    curl -XPUT "localhost:1205/databases/MY_DATABASE/stacks?name=BOOKSHELF"
    curl -XPOST localhost:1205/databases/MY_DATABASE/stacks/BOOKSHELF \
        -d '{"element":{"title":"1984","author":"George Orwell","ISBN":"1595404325","comments":[]}}'
    curl "localhost:1205/databases/MY_DATABASE/stacks/BOOKSHELF?is_empty"

Verify the following curl call will return is_empty = true

        curl -XPUT "localhost:1205/databases?name=MY_DATABASE"
        curl -XPUT "localhost:1205/databases/MY_DATABASE/stacks?name=BOOKSHELF"
        curl "localhost:1205/databases/MY_DATABASE/stacks/BOOKSHELF?is_empty"

Verify that empty db or stack will have standard empty response

[codecov-io]

Codecov Report

Merging #67 into dev-0.2 will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           dev-0.2    #67    +/-   ##
=======================================
  Coverage      100%   100%            
=======================================
  Files           16     18     +2     
  Lines          657    778   +121     
=======================================
+ Hits           657    778   +121

Impacted Files	Coverage Δ
pilad/conn.go	100% <100%> (ø)	⬆️
pila/stack.go	100% <100%> (ø)	⬆️
config/config.go	100% <0%> (ø)	⬆️
main.go
pkg/stack/stack.go	100% <0%> (ø)
pilad/config.go	100% <0%> (ø)
pilad/main.go	100% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update de1a46f...c84f122. Read the comment docs.

[fern4lvarez]

This looks great now 👌

I added some small fixes, mostly formatting, wording and naming related. Then with a bit of time I'll try the functionality itself, update CHANGELOG and Merge ⭐

@jlr52 can you in the meantime update the pilad README.md file? Adding something like this, but for EMPTY? https://github.com/fern4lvarez/piladb/blob/master/pilad/README.md#get-databasesdatabase_idstacksstack_idsize

Thanks and great work!

[jlr52]

@fern4lvarez

For sure, I will update the docs on my next pull request. Thanks for fixing the coding styles and mismatch %v, I will be more meticulous next time.

[fern4lvarez]

@jlr52 you can do it in this same PR.

[jlr52]

Doc is added.

[fern4lvarez]

Merged 🎉