Znowflake is a network service for generating unique 64-bit ID numbers. It's similar to Twitter's Snowflake. Znowflake is implemented in C with ZeroMQ via CZMQ.
Please read the documents for Snowflake. Our motivation and requirements are similar.
There are some differences:
- Wider machine ID field
- Epoch at 1337000000 (May 14, 2012)
- Quits generating unique IDs sooner (good for around 17 years)
- Relaxed performance and resolution requirements
Znowflake is a Linux daemon. It might compile on other systems - give it a shot.
It accepts options for port number, machine number, and an option to daemonize. If the port isn't given, it defaults to 23138.
znowflaked -p 5555 -m 7384
This gets a ZMQ_REP socket listening on port 5555.
znowflaked also reads a simple libconfig-based
configuration file:
znowflaked -f /etc/znowflaked/znowflaked.conf
Sample configuration file contents:
machine: 2849;
port: 4242;
To daemonize, pass in the -d flag:
znowflaked -d -m 100
An init script for CentOS is found in the znowflaked.sh file. Get the whole thing running:
gcc znowflaked.c -lconfig -lczmq -lzmq -o /usr/local/bin/znowflaked
cp znowflaked.sh /etc/init.d/znowflaked
vi /etc/znowflake/znowflake.conf
service znowflaked start
Start on boot:
chkconfig --add znowflaked
chkconfig znowflaked on
client.c and client.rb show you how to get IDs from the server.
cclient.c is a continuously running client, useful for testing.
cclient -p 1234 -r 1000
grabs IDs from port 1234 at a rate of 1000 per second. Try running multiple instances of cclient.