Use pubsub to distribute a changing file

[benhylau]

The file we want to distribute is the changing live.m3u8 because IPNS isn't reliable, and ipfs pubsub pub <topic> <data> seems to work well.

First we need to enable --enable-pubsub-experiment in the /etc/systemd/system/ipfs.service for all the ipfs nodes. Then on server:

ipfs add live/current.m3u8 | awk '{print $2","}' | ipfs pubsub pub m3u8

On mirrors, run:

ipfs pubsub sub m3u8 > m3u8-sub.log

and in a crontab:

ipfs cat `awk -F, '{ print $(NF-1) }' m3u8-sub.log` > live.m3u8

We decided not to use this for Our Networks since:

• Anyone can pub, we don't have time to implement access control before the conference
• pubsub lacks an interface easy for video player to consume (e.g. http://<gateway>:8080/pubsub/<topic>)
• We know wget is reliable and functionally this is just another way for us to do that without the benefits of IPNS

[darkdrgn2k]

Might be interesting to look at https://cluster.ipfs.io/