ZRE protocol implementation https://rfc.zeromq.org/spec:36/ZRE/
Peer-to-peer local area networking with reliable group messaging and automatic peer discovery.
Clone and test:
git clone https://git.48.io/zre/ cd zre stack build stack exec zre # in another terminal or networked computer stack exec zre # optionally install zre binaries stack install
Two zre peers should find each other and be able to send message between each other. Firewall needs to allow traffic on UDP port 5670 and TCP port range 41000-41100. Application picks random port from this range and advertises it to network.
Few applications are provided to get you started:
- zre - interact and dump events
- zrecat <group> - cat messages for group
These can be installed locally with stack install command.
Try running multiple copies of zre and zrecat on the same computer or computers on the local network:
zre # another terminal zrecat test # now in original terminal you can join testgroup with > /join test # or send messages to it > /shout test msg
Send uptime periodically to uptime group:
( while true; do uptime; sleep 1; done ) | zrecat uptime
Cat file to group:
cat /etc/os-release | zrecat test
zre # in zre shell following commands are supported: > /join time > /shout time test! > /leave time > /join uptime > /whisper <uuid> message
Implementation of gossip protocol is included in form of key value TTL server. This allows connecting peers from different networks (or subnets) not reachable via multicast beacon. This service requires TCP port 31337 and can be started with zgossip_server binary.
Pass gossip endpoint to apps with:
zre -g <gossip_ip>:31337
ZRE applications using runZre will automatically try to load configuration file if ZRECFG environment variable points to it. See zre.conf for configuration example:
ZRECFG=./zre.conf zrecat test
To be able to use one config for multiple apps and still be able to distinguish between them you can also set ZRENAME environment variable which overrides name from config or default config if ZRECFG is not used:
ZRENAME=zrenode1 zrecat test