ulid-native

This is a simple ruby extension wrapper for https://github.com/skeeto/ulid-c.

For simple single-threaded use, you can call ULID.generate to generate a ULID.

For multi-threaded use, or if you care about the generator mode, use:

# gen = ULID::Generator.new(format, flags = 0)
gen = ULID::Generator.new(ULID::FORMAT_LEX62)
gen.generate

Format must be one of:

• ULID::FORMAT_TEXT: the default Base32 ULID format (26 bytes)
• ULID::FORMAT_BINARY: Raw binary ULID (15 bytes)
• ULID::FORMAT_LEX62: Lexicographically-ordered Base62 (21 bytes)

Flags can be zero or more (i.e. a | b) of:

• ULID::RELAXED: allows ULIDs generated within the same millisecond can be non-monotonic, e.g. the random section is generated fresh each time.
• ULID::PARANOID: Causes the generator to clear the highest bit of the random field, which guarantees that overflow cannot occur. Normally the chance of overflow is non-zero, but negligible. This makes it zero. It doesn't make sense to use this flag in conjunction with ULID::RELAXED.
• ULID::SECURE: doesn't fall back on generated entropy for initialization if system entropy could not be gathered. An error is raised instead.

Benchmarks

On my machine (a 2021 M1 Macbook Pro):

• ULID::FORMAT_BINARY generates in about 50ns;
• ULID::FORMAT_TEXT generates in about 100ns;
• ULID::FORMAT_LEX62 generates in about 3000ns;