rawlinp opened a new pull request #3538: Minor versioning prototype
URL: https://github.com/apache/trafficcontrol/pull/3538
 
 
   This is a draft PR to illustrate my idea for handling TO API minor 
versioning.
   
   Essentially, requests that come in at a previous minor version will be 
"upgraded" into requests of the next latest versions until they are finally 
handled by one "main" handler that always handles requests at the latest minor 
version. The result is then passed back down the chain until the result is 
translated back into the minor version that the client originally requested.
   
   For POST requests, the "upgrade" process is simply just taking the specific 
minor version, embedding it into the next latest struct version, and passing it 
up. For PUT requests, the "upgrade" process would include reading the existing 
fields for the next latest minor version from the DB and passing it up to the 
next handler.
   
   What we end up with is a chain of "sub-handlers" that simply upgrade 
requests into the next latest minor version until the request is finally 
handled at the latest minor version -- the "main" handler -- then downgrade 
that result until the originally requested minor version is returned.

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