[GitHub] [trafficcontrol] rawlinp opened a new pull request #4145: Add TO API Routing Blacklist via cdn.conf

[GitBox <gi...@apache.org>]

rawlinp opened a new pull request #4145: Add TO API Routing Blacklist via cdn.conf
URL: https://github.com/apache/trafficcontrol/pull/4145
 
 
   ## What does this PR (Pull Request) do?
   Add a `"routing_blacklist"` field to cdn.conf's "traffic_ops_golang"
   section, consisting of two array fields:
   - `"perl_routes"`: routes that will be handled by TO-Perl instead of Go
   - `"disabled_routes"`: routes that will be disabled by immediately
       returning a 503
   
   These fields are arrays of route IDs (integers). As part of this change,
   routes in `traffic_ops_golang` get a unique ID now, as well as a boolean
   field indicating whether or not the route can be bypassed to TO-Perl.
   
   Add a `--api-routes` flag to `traffic_ops_golang` that prints out all the
   route information (ID, version, path, etc) and exits.
   
   - [x] This PR is not related to any Issue
   
   ## Which Traffic Control components are affected by this PR?
   - Documentation
   - Traffic Ops
   
   ## What is the best way to verify this PR?
   1. Run the `traffic_ops_golang` unit tests
   2. Run the TO API tests
   3. Configure `cdn.conf` to disable a certain route, make a request to that route, and verify that a 503 response is returned.
   4. Configure `cdn.conf` to have Perl handle a certain route, make a request to that route, and verify that the route was handled by TO-Perl and not Go.
   
   ## The following criteria are ALL met by this PR
   
   - [x] This PR includes tests OR I have explained why tests are unnecessary
   - [x] This PR includes documentation OR I have explained why documentation is unnecessary
   - [x] This PR includes an update to CHANGELOG.md OR such an update is not necessary
   - [x] This PR includes any and all required license headers
   - [x] This PR ensures that database migration sequence is correct OR this PR does not include a database migration
   - [x] This PR **DOES NOT FIX A SERIOUS SECURITY VULNERABILITY** (see [the Apache Software Foundation's security guidelines](https://www.apache.org/security/) for details)

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