add 'random' library

src/util/random.cpp

@@ -0,0 +1,44 @@
+#include "random.hpp"
+
+#include <random>
+
+static std::random_device random_device;
+
+static const char* uuid_hex_chars = "0123456789abcdef";
+static const char* uuid_hex_variant_chars = "89ab";
+
+std::string util::generate_uuid() {
+    auto randomEngine = seeded_random_engine(random_device);
+    static std::uniform_int_distribution<> dist(0, 15);
+    static std::uniform_int_distribution<> dist2(0, 3);
+
+    std::string uuid;
+    uuid.resize(36);
+
+    for (int i = 0; i < 8; i++) {
+        uuid[i] = uuid_hex_chars[dist(randomEngine)];
+    }
+    uuid[8] = '-';
+    for (int i = 9; i < 13; i++) {
+        uuid[i] = uuid_hex_chars[dist(randomEngine)];
+    }
+    uuid[13] = '-';
+    uuid[14] = '4';
+
+    for (int i = 15; i < 18; i++) {
+        uuid[i] = uuid_hex_chars[dist(randomEngine)];
+    }
+
+    uuid[18] = '-';
+    uuid[19] = uuid_hex_variant_chars[dist2(randomEngine)];
+
+    for (int i = 20; i < 23; i++) {
+        uuid[i] = uuid_hex_chars[dist(randomEngine)];
+    }
+
+    uuid[23] = '-';
+        for (int i = 24; i < 36; i++) {
+        uuid[i] = uuid_hex_chars[dist(randomEngine)];
+    }
+    return uuid;
+}