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test(tools): rng singleton #1895

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13 changes: 3 additions & 10 deletions tests/tools/crypto.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -10,19 +10,12 @@
import chronos/streams/tlsstream, stew/byteutils
import ../../libp2p/[crypto/crypto, transports/tls/certificate]

type RngWrap = object
rng: ref HmacDrbgContext

var rngVar: RngWrap
var rngSingleton {.threadvar.}: ref HmacDrbgContext
rngSingleton = newRng()

proc getRng(): ref HmacDrbgContext =
# TODO if `rngVar` is a threadvar like it should be, there are random and
# spurious compile failures on mac - this is not gcsafe but for the
# purpose of the tests, it's ok as long as we only use a single thread
{.gcsafe.}:
if rngVar.rng.isNil:
rngVar.rng = newRng()
rngVar.rng
rngSingleton

template rng*(): ref HmacDrbgContext =
getRng()
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