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Ken-Håvard Lieng 2525b06c28 Use firebase push IDs for messages		2017-04-20 05:32:22 +02:00
..
betterguid.go	Use firebase push IDs for messages	2017-04-20 05:32:22 +02:00
doc.go	Use firebase push IDs for messages	2017-04-20 05:32:22 +02:00
LICENSE	Use firebase push IDs for messages	2017-04-20 05:32:22 +02:00
README.md	Use firebase push IDs for messages	2017-04-20 05:32:22 +02:00

This is Go package to generate guid (globally unique id) with good properties

Usage:

import "github.com/kjk/betterguid"

id := betterguid.New()
fmt.Printf("guid: '%s'\n", id)

Generated guids have good properties:

they're 20 character strings, safe for inclusion in urls (don't require escaping)
they're based on timestamp so that they sort after any existing ids
they contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs
they sort lexicographically (so the timestamp is converted to characters that will sort properly)
they're monotonically increasing. Even if you generate more than one in the same timestamp, thelatter ones will sort after the former ones. We do this by using the previous random bits but "incrementing" them by 1 (only in the case of a timestamp collision).