nim-quic/tests/quic/helpers/ids.nim

import ngtcp2
import sysrandom

proc connectionId*(bytes: ptr uint8, length: uint): ngtcp2_cid =
  ngtcp2_cid_init(addr result, bytes, length)

proc randomConnectionId*(): ngtcp2_cid =
  var bytes: array[18, uint8]
  getRandomBytes(addr bytes[0], bytes.len)
  ngtcp2_cid_init(addr result, addr bytes[0], bytes.len.uint)

var clientSourceId* = randomConnectionId()
var clientDestinationId* = randomConnectionId()
var serverSourceId* = randomConnectionId()
var serverDestinationId* = randomConnectionId()

var nextConnectionId = 1'u8

proc getNewConnectionId*(connection: ptr ngtcp2_conn, id: ptr ngtcp2_cid, token: ptr uint8, cidlen: uint, userData: pointer): cint {.cdecl.} =
  zeroMem(addr id.data[0], cidlen)
  id.data[0] = nextConnectionId
  inc(nextConnectionId)
  id.datalen = cidlen
  zeroMem(token, NGTCP2_STATELESS_RESET_TOKENLEN)