* Fix(backend): Stream logs without causing OOM
Also be smarter about when to use `heapq.merge` and when to use
`itertools.chain`: If all the logs are coming from the same instance we
`chain` them, otherwise we'll `merge` them
iterator fixes:
- group wacz files by instance by suffix, eg. -0.wacz, -1.wacz, -2.wacz
- sort wacz files, and all logs within each wacz file
- chain log iterators for all log files within wacz group
- merge log iterators across wacz files in different groups
- add type hints to help keep track of iterator helper functions
- add iter_lines() from botocore, use that for line parsing for simplicity
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Co-authored-by: Ilya Kreymer <ikreymer@gmail.com>
If a crawl is completed, the endpoint streams the logs from the log
files in all of the created WACZ files, sorted by timestamp.
The API endpoint supports filtering by log_level and context whether
the crawl is still running or not.
This is not yet proper streaming because the entire log file is read
into memory before being streamed to the client. We will want to
switch to proper streaming eventually, but are currently blocked by
an aiobotocore bug - see:
https://github.com/aio-libs/aiobotocore/issues/991?#issuecomment-1490737762
