jerrypeng opened a new pull request #3969: Cleanup temporary files created by functions URL: https://github.com/apache/pulsar/pull/3969 ### Motivation Currently, in functions internal code, temporary files are created for purposes of downloading function packages locally. These files care never cleaned up and may linger around for a long time. In the best case, this will only cause storage to be unnecessarily wasted but in the worst case this can cause memory issues (which usually is going to be a lot smaller than storage) especially for brokers/workers running in containers since the whole filesystem is just in memory. ### Modifications Clean up the temporary files that are created. To do this I also need to do the following: 1. Refactor the code because the temporary file creation was deeply embedded and sprinkled in random places 2. Because I need to refactor the code, I also needed separate out the code for V3 endpoints and the code for V2 endpoints as all that logic is currently mushed together and extremely convoluted. 3. Fix all the tests because of the refactoring 4. After the refactoring, the temporary files can be referenced thus deleted. 5. Added tests to test temp file cleanup
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