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4aed453b06
Summary: Ref T7149. This isn't complete and isn't active yet, but does basically work. I'll shore it up in the next few diffs. The new workflow goes like this: > Client, file.allocate(): I'd like to upload a file with length L, metadata M, and hash H. Then the server returns `upload` (a boolean) and `filePHID` (a PHID). These mean: | upload | filePHID | means | |---|---|---| | false | false | Server can't accept file. | false | true | File data already known, file created from hash. | true | false | Just upload normally. | true | true | Query chunks to start or resume a chunked upload. All but the last case are uninteresting and work like exising uploads with `file.uploadhash` (which we can eventually deprecate). In the last case: > Client, file.querychunks(): Give me a list of chunks that I should upload. This returns all the chunks for the file. Chunks have a start byte, an end byte, and a "complete" flag to indicate that the server already has the data. Then, the client fills in chunks by sending them: > Client, file.uploadchunk(): Here is the data for one chunk. This stuff doesn't work yet or has some caveats: - I haven't tested resume much. - Files need an "isPartial()" flag for partial uploads, and the UI needs to respect it. - The JS client needs to become chunk-aware. - Chunk size is set crazy low to make testing easier. - Some debugging flags that I'll remove soon-ish. - Downloading works, but still streams the whole file into memory. - This storage engine is disabled by default (hardcoded as a unit test engine) because it's still sketchy. - Need some code to remove the "isParital" flag when the last chunk is uploaded. - Maybe do checksumming on chunks. Test Plan: - Hacked up `arc upload` (see next diff) to be chunk-aware and uploaded a readme in 18 32-byte chunks. Then downloaded it. Got the same file back that I uploaded. - File UI now shows some basic chunk info for chunked files: {F336434} Reviewers: btrahan Reviewed By: btrahan Subscribers: joshuaspence, epriestley Maniphest Tasks: T7149 Differential Revision: https://secure.phabricator.com/D12060 |
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