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thrimbletrimmer-solid
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chrusher/bus_synthesizer
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archive/original-v2.1
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Mike Lang 10cca18922 Fix a deadlock due to signal interactions with prometheus client 
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
backfiller Add stacksampler to all services 6 years ago
common Fix a deadlock due to signal interactions with prometheus client 6 years ago
downloader Add stacksampler to all services 6 years ago
restreamer Add stacksampler to all services 6 years ago
.gitignore Set up a docker compose file to run all images 6 years ago
.travis.yml travis.yml: Make script into individual lines 6 years ago
LICENSE Licence under MIT 6 years ago
README.md Set up a docker compose file to run all images 6 years ago
build Adding in stuff to hopefully get this to run 6 years ago
docker-compose.jsonnet Enable backdoor in all services, and add telnet to containers 6 years ago
generate-docker-compose generate-docker-compose: Clean up the container afterwards 6 years ago
generate-flamegraph generate-flamegraph: Script to create a flamegraph by querying prometheus 6 years ago
initial-design-doc.pdf Add initial design doc 6 years ago

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.