aboutsummaryrefslogtreecommitdiff
path: root/src/test/util/random.cpp
diff options
context:
space:
mode:
authorjonatack <jon@atack.com>2023-01-22 09:57:19 -0800
committerJon Atack <jon@atack.com>2023-06-14 08:28:33 -0600
commit1b246fdd145a95f5da479159f5e8eaf5a76bdc3a (patch)
treea7799cb90d8d0c5ffa96040ed95a97e82eff399a /src/test/util/random.cpp
parent681ecac5c2d462920cd32636eec15599a9bcf424 (diff)
test: move remaining random test util code from setup_common to random
and drop the util/random dependency on util/setup_common. This improves code separation and avoids creating a circular dependency if setup_common needs to call the util/random functions.
Diffstat (limited to 'src/test/util/random.cpp')
-rw-r--r--src/test/util/random.cpp33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/util/random.cpp b/src/test/util/random.cpp
new file mode 100644
index 0000000000..4c87ab8df8
--- /dev/null
+++ b/src/test/util/random.cpp
@@ -0,0 +1,33 @@
+// 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.
+
+#include <test/util/random.h>
+
+#include <logging.h>
+#include <random.h>
+#include <uint256.h>
+
+#include <cstdlib>
+#include <string>
+
+FastRandomContext g_insecure_rand_ctx;
+
+/** Return the unsigned from the environment var if available, otherwise 0 */
+static uint256 GetUintFromEnv(const std::string& env_name)
+{
+ const char* num = std::getenv(env_name.c_str());
+ if (!num) return {};
+ return uint256S(num);
+}
+
+void Seed(FastRandomContext& ctx)
+{
+ // Should be enough to get the seed once for the process
+ static uint256 seed{};
+ static const std::string RANDOM_CTX_SEED{"RANDOM_CTX_SEED"};
+ if (seed.IsNull()) seed = GetUintFromEnv(RANDOM_CTX_SEED);
+ if (seed.IsNull()) seed = GetRandHash();
+ LogPrintf("%s: Setting random seed for current tests to %s=%s\n", __func__, RANDOM_CTX_SEED, seed.GetHex());
+ ctx = FastRandomContext(seed);
+}