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Shay 429ecb7564

Handle remote download responses with UNKNOWN_LENGTH more gracefully (#17439 )

Prior to this PR, remote downloads which did not provide a
`content-length` were decremented from the remote download ratelimiter
at the max allowable size, leading to excessive ratelimiting - see
https://github.com/element-hq/synapse/issues/17394.

This PR adds a linearizer to limit concurrent remote downloads to 6 per
IP address, and decrements remote downloads without a `content-length`
from the ratelimiter *after* the download is complete and the response
length is known.

Also adds logic to ensure that responses with a known length respect the
`max_download_size`.

2024-07-16 11:13:55 +01:00

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Limit concurrent remote downloads to 6 per IP address, and decrement remote downloads without a content-length from the ratelimiter after the download is complete.