common/util: move function random_int to util (#29388)

common/util.cc

@@ -213,6 +213,13 @@ std::string hexdump(const uint8_t* in, const size_t size) {
   return ss.str();
 }
 
+int random_int(int min, int max) {
+  std::random_device dev;
+  std::mt19937 rng(dev());
+  std::uniform_int_distribution<std::mt19937::result_type> dist(min, max);
+  return dist(rng);
+}
+
 std::string random_string(std::string::size_type length) {
   const std::string chrs = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
   std::mt19937 rg{std::random_device{}()};

common/util.h

@@ -75,9 +75,12 @@ int getenv(const char* key, int default_val);
 float getenv(const char* key, float default_val);
 
 std::string hexdump(const uint8_t* in, const size_t size);
-std::string random_string(std::string::size_type length);
 std::string dir_name(std::string const& path);
 
+// ***** random helpers *****
+int random_int(int min, int max);
+std::string random_string(std::string::size_type length);
+
 // **** file fhelpers *****
 std::string read_file(const std::string& fn);
 std::map<std::string, std::string> read_files_in_dir(const std::string& path);