Summary:
Fixes T7621. The engine selection code started out making sense, but didn't make as much sense by the time I was done with it.
Specifically, from the vanilla file upload, we may incorrectly try to write directly to the chunk storage engine. This is incorrect, and produces a confusing/bad error.
Make chunk storage engines explicit and don't try to do single-file one-shot writes to them.
Test Plan:
- Tried to upload a large file with vanilla uploader, got better error message.
- Uploaded small and large files with drag and drop.
- Viewed {nav Files > Help/Options}.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T7621
Differential Revision: https://secure.phabricator.com/D12110
Summary:
Fixes T5843. File storage engines use a very old "selector" mechanism which makes them difficult to extend.
This mechanism predates widespread use of `PhutilSymbolLoader` to discover available implementations at runtime. Runtime discovery has generally proven more flexible and easier to use than explicit selection (although it sometimes needs more UI to support it in cases where order or enabled/disabled flags can not be directly determined).
Use a modern runtime discovery mechanism instead of an explicit selector. This might break any installs which subclassed the `Selector`, but I believe almost no such installs exist, and they'll receive a meaningful exception upon upgrading (any custom engines will no longer implement all of the required methods).
Looking forward, this modernizes infrastructure to prepare for new "virtual" chunked-storage engines, with the eventual goal of supporting very large file uploads and data import into the Phacility cluster.
This uses D12051 to add UI to make it easier to understand the state of storage engines.
Test Plan:
Used new UI panel to assess storage engines:
{F336270}
- Uploaded a small file, saw it go to MySQL engine.
- Uploaded a larger file, saw it go to S3 engine.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T5843
Differential Revision: https://secure.phabricator.com/D12053
