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Example code of gendoria/cruftflake

Informations about the package cruftflake

CruftFlake

Build Status Scrutinizer Code Quality Code Coverage Downloads Latest Stable Version

Unique ID generator based on Twitter Snowflake, but in PHP with a simple ZeroMQ interface (rather than Thrift).

This is a rewrite of dvomedia/cruftflake. It organizes the code in modules and adds several interfaces, allowing easier extension of other server and configuration mechanisms.

Implementation

The implementation copies Twitter - generating 64 bit IDs.

Has a custom epoch that means it can generate IDs until 2081-09-06 (not the same epoch as Snowflake).

ZooKeeper for config coordination

We use ZooKeeper to store which machine IDs are in use. When a new node starts up for the first time it must be able to contact the ZooKeeper cluster and create a new node. It will look at all the existing nodes and then (if it can't find its own Mac Address) attempt to claim a free one.

I was using Ephemeral nodes for this - similar(ish) to a lock pattern but this had the issue that the node needed to remain connected to ZK throughout its lifetime -- this way it doesn't.

The downside is that potentially the 1024 possible machine IDs will "fill up" and need to be manually pruned.

Running

Installation via composer:

There are several example scripts provided for playing about with. Both require previous composer update.

  1. The generator (the server)

  2. A client, that will generate N IDs and dump to STDOUT

  3. A client, that will ask server for generator status

For client examples to work, server example has to be be running.

Dependencies

Composer requires php-zmq module installed.

All versions of cruftflake with dependencies

PHP Build Version
Package Version
Requires php Version >=5.3.9
ext-zmq Version *
psr/log Version ~1.0
symfony/console Version >=2.5
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