support multiple yaml config files

[samanhappy]

This PR is trying to resolve #201 by merging multiple yaml files.

The merge work is completed by https://github.com/mikefarah/yq using merge operator * and append arrays flag +, more details can refer https://mikefarah.gitbook.io/yq/operators/multiply-merge.

[codecov-commenter]

Codecov Report

Base: 99.64% // Head: 99.64% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (61840ee) compared to base (668a312).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #218   +/-   ##
=======================================
  Coverage   99.64%   99.64%           
=======================================
  Files          71       72    +1     
  Lines        5061     5083   +22     
=======================================
+ Hits         5043     5065   +22     
  Misses         12       12           
  Partials        6        6           

Impacted Files	Coverage Δ
conf/conf.go	96.72% <100.00%> (+0.04%)	⬆️
conf/merge.go	100.00% <100.00%> (ø)

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[haoel]

I am not sure this merge function would work well.

because the array is nested in the notify section. and for settings, we should merge the settings instead of overwriting the whole settings

I think we can do this better.

how about just using the yq? here is an example use it as a library: https://github.com/kamolhasan/yq-for-strings

[samanhappy]

The settings are merged already, the example maybe a little misleading, so I modified it and will add more tests later.

The merge code is simple now, I will research the yq to see if there is a better solution.

[haoel]

At least, I think we must pass the following mandatory test cases:

1. Section Merge Case

into

http:
  - name: "test 1"
    url: "http://localhost:8080"
    method: "GET"
tcp:
  - name: "test 2"
    host: "localhost:8080"

from

notify:
  slack:
    - name: "slack"
      webhook: "https://hooks.slack.com/services/xxxxxx"

result

http:
  - name: "test 1"
    url: "http://localhost:8080"
    method: "GET"
tcp:
  - name: "test 2"
    host: "localhost:8080"
notify:
  slack:
    - name: "slack"
      webhook: "https://hooks.slack.com/services/xxxxxx"

2. Same Probe Merge Case

into

http:
    - name: "test 1"
        url: "http://localhost:8080"
        method: "GET"

from

http:
    - name: "test 2"
        url: "http://localhost:8181"
        method: "GET"

result

http:
  - name: "test 1"
    url: "http://localhost:8080"
    method: "GET"
  - name: "test 2"
    url: "http://localhost:8181"
    method: "GET"

3. Notify Merge Case

into

notify:
  slack:
    - name: slack
      webhook: "https://hooks.slack.com/services/xxxxxx"

from

notify:
  discord:
    - name: discord
      webhook: "https://discord.com/api/webhooks/xxxxxx"

result

notify:
  slack:
    - name: slack
      webhook: "https://hooks.slack.com/services/xxxxxx"
  discord:
    - name: discord
      webhook: "https://discord.com/api/webhooks/xxxxxx"

4. Notify Array Merge Case

into

notify:
  slack:
    - name: slack1
      webhook: "https://hooks.slack.com/services/xxxxxx"

from

notify:
  slack:
    - name: slack2
      webhook: "https://hooks.slack.com/services/xxxxxx"

result

notify:
  slack:
    - name: slack1
      webhook: "https://hooks.slack.com/services/xxxxxx"
    - name: slack2
      webhook: "https://hooks.slack.com/services/xxxxxx"

5. Settings Merge Case

into

settings:
  name: easeprobe
  sla:
    schedule: "daily"
    time: "00:00"
  notify:
    retry:
      times: 5
      interval: 10

from

settings:
  name: easeprobe_from
  probe:
    timeout: 10s
    interval: 30s
   sla:
    schedule: "weekly"

result

settings:
  name: easeprobe_from
  probe:
    timeout: 10s
    interval: 30s
  notify:
    retry:
      times: 5
      interval: 10
  sla:
    schedule: "weekly"

[haoel]

LGTM