Method: FFaker::UUID#uuidv8

Defined in:
lib/ffaker/uuid.rb

#uuidv8 ⇒ Object

> UUID version 8 provides an RFC-compatible format for experimental or > vendor-specific use cases. The only requirement is that the variant and > version bits MUST be set as defined in Section 4.1 and Section 4.2. > UUIDv8’s uniqueness will be implementation-specific and MUST NOT be > assumed. > > […] To be clear: UUIDv8 is not a replacement for UUIDv4 Section 5.4 > where all 122 extra bits are filled with random data.



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# File 'lib/ffaker/uuid.rb', line 140

def uuidv8
  uuid = 0
  # custom_a
  # > The first 48 bits of the layout that can be filled as an
  # > implementation sees fit. Occupies bits 0 through 47 (octets 0-5).
  uuid |= rand((2**48) - 1) << 80
  # ver
  # > The 4 bit version field as defined by Section 4.2, set to 0b1000 (8).
  # > Occupies bits 48 through 51 of octet 6.
  uuid |= 0b1000 << 76
  # custom_b
  # > 12 more bits of the layout that can be filled as an implementation
  # > sees fit. Occupies bits 52 through 63 (octets 6-7).
  uuid |= rand((2**12) - 1) << 64
  # var
  # > The 2 bit variant field as defined by Section 4.1, set to 0b10.
  # > Occupies bits 64 and 65 of octet 8.
  uuid |= 0b10 << 62
  # custom_c
  # > The final 62 bits of the layout immediately following the var field
  # > to be filled as an implementation sees fit. Occupies bits 66 through
  # > 127 (octets 8-15).
  uuid |= rand((2**62) - 1)

  as_string(uuid)
end