nim-codex/dagger/rng.nim

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Poc 2 (#7) * moving protobuf into bitswap * adding block type * reworking bitswap * adding chunker * adding license header * use 1.2.6 * adding fixed size chunker * add blockstore * add iterator to chunker * more bitswap changes * rename ipfs to dagger * rename to dagger * blockstore inherits from BlockProvider * wip - add core block handling logic * smal changes * use proper block store methods * adding asynq heapqueue * wip prepare for bitswap task runner * adding `$` * adding memory store and tests * fixed chunking * extracted desicion engine from bitswap * added helper random funcs * adding testing helpers * only handle seqs * add peer events * cleanup pending blocks on blockstore event * allow nil handlers * move protobuf type helpers * allow initializing block from Cid * testing and fixes * small fixes * expose `<` * spelling * default value * spelling * pending blocks manager * adding stores manager * more tests a wip around bitswap * small changes * merge bitswap and engine for now * for now run only the new poc's tests * add a more complete ci setup * use template in map * remove p2pd * remove go * dont use asyncCheck * few small changes * adding ability to update items * adding multiple task runners * handle cancelation properly * use Result instead of throwing * wip bitswap tests * moving things around * split out engine again * add request and handlers interface * fix tests * wip - engine tests * remove unused imports * fix tests * cleanup block requesting logic * add block request tests * more block requests * add support for max heap * don't use result * use max heap & send block presence in task handler * add task handler tests * rename store to localStore * cleanup & logging * cancel task on stop * don't depend on local store for events * dont use heap queue for wants * add chronicles * fix issue with peer wants * add test for delayed block sends * remove obsolete tests * wip chunker * run all tests * add todo * misc * remove irrelevant files * removing more files * adding helpers for bitswap tests * moved bitswap file * misc * make blocks timeout longer * adjust block timeout * speedup test * compile with threads * import missing crypto * misc * disable threads for now * fix 32 bit platforms * re-enable threads support in tests
2021-02-26 00:23:22 +00:00
## Nim-Dagger
## Copyright (c) 2021 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import pkg/libp2p/crypto/crypto
import pkg/bearssl
type
Rng* = ref BrHmacDrbgContext
var rng {.threadvar.}: Rng
proc instance*(t: type Rng): Rng =
if rng.isNil:
rng = newRng()
rng
# Random helpers: similar as in stdlib, but with BrHmacDrbgContext rng
# TODO: Move these somewhere else?
const randMax = 18_446_744_073_709_551_615'u64
proc rand*(rng: Rng, max: Natural): int =
if max == 0: return 0
var x: uint64
while true:
brHmacDrbgGenerate(addr rng[], addr x, csize_t(sizeof(x)))
if x < randMax - (randMax mod (uint64(max) + 1'u64)): # against modulo bias
return int(x mod (uint64(max) + 1'u64))
proc sample*[T](rng: Rng, a: openArray[T]): T =
result = a[rng.rand(a.high)]
proc shuffle*[T](rng: Rng, a: var openArray[T]) =
for i in countdown(a.high, 1):
let j = rng.rand(i)
swap(a[i], a[j])