mirror of https://github.com/ekimekim/wubloader
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10cca18922
The prometheus client uses a threading.Lock() to prevent shared access to certain metric state. This lock is taken as part of doing collection, as well as during metric.labels(). We hit a deadlock where our stack sampler signal arrived during a collection, when the lock was held. This meant that flamegraph.labels() blocked forever, and the lock was never released, hanging all metrics collection. Our solution is a hack, which is to reach into the internals of our metric object and replace its lock with a dummy one. This is reasonably safe, but only as long as the prometheus_client internal structure doesn't change signfigiantly. |
6 years ago | |
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| backfiller | ||
| common | ||
| downloader | ||
| restreamer | ||
| .gitignore | ||
| .travis.yml | ||
| LICENSE | ||
| README.md | ||
| build | ||
| docker-compose.jsonnet | ||
| generate-docker-compose | ||
| generate-flamegraph | ||
| initial-design-doc.pdf | ||
README.md
Wubloader is a system for saving, re-serving and cutting into videos of a target twitch (or probably other HLS, but some twitch specifics are assumed) stream.
It was designed to serve the needs of the Video Strike Team as part of Desert Bus For Hope.
A full design doc can be read at initial-design-doc.pdf, but a brief overview of the components:
- Downloader grabs segments from twitch and saves them to disk
- Restreamer serves segments from disk as well as playlist files allowing them to be streamed
- Backfiller queries restreamers of other servers in order to pick up segments this server doesn't have already, ie. it replicates missing segments.
- Cutter interacts with a database to perform cutting jobs
- Sheet Sync syncs specifc database columns to a google doc which is the primary operator interface.
Usage
All components are built as docker images.
Components which access the disk expect a shared directory mounted at /mnt.
A docker-compose file is provided to run all components. See docker-compose.jsonnet
to set configuration options, then generate the compose file with ./generate-docker-compose.
Then run docker-compose up.