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// Copyright (c) 2023 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_TEST_UTIL_RANDOM_H
#define BITCOIN_TEST_UTIL_RANDOM_H
#include <consensus/amount.h>
#include <random.h>
#include <uint256.h>
#include <cstdint>
/**
* This global and the helpers that use it are not thread-safe.
*
* If thread-safety is needed, the global could be made thread_local (given
* that thread_local is supported on all architectures we support) or a
* per-thread instance could be used in the multi-threaded test.
*/
extern FastRandomContext g_insecure_rand_ctx;
/**
* Flag to make GetRand in random.h return the same number
*/
extern bool g_mock_deterministic_tests;
enum class SeedRand {
ZEROS, //!< Seed with a compile time constant of zeros
SEED, //!< Call the Seed() helper
};
/** Seed the given random ctx or use the seed passed in via an environment var */
void Seed(FastRandomContext& ctx);
static inline void SeedInsecureRand(SeedRand seed = SeedRand::SEED)
{
if (seed == SeedRand::ZEROS) {
g_insecure_rand_ctx = FastRandomContext(/*fDeterministic=*/true);
} else {
Seed(g_insecure_rand_ctx);
}
}
static inline uint32_t InsecureRand32()
{
return g_insecure_rand_ctx.rand32();
}
static inline uint256 InsecureRand256()
{
return g_insecure_rand_ctx.rand256();
}
static inline uint64_t InsecureRandBits(int bits)
{
return g_insecure_rand_ctx.randbits(bits);
}
static inline uint64_t InsecureRandRange(uint64_t range)
{
return g_insecure_rand_ctx.randrange(range);
}
static inline bool InsecureRandBool()
{
return g_insecure_rand_ctx.randbool();
}
static inline CAmount InsecureRandMoneyAmount()
{
return static_cast<CAmount>(InsecureRandRange(MAX_MONEY + 1));
}
#endif // BITCOIN_TEST_UTIL_RANDOM_H
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