refactor: reimplementing some methods directly in dash-chainstate to avoid extra heavy dependencies

Implemented:
  - ValueFromAmount (core_write.cpp)
  - GetPrettyExceptionStr (stacktrackes.cpp)

Defined:
  - g_stats_client

Author: knst

src/bitcoin-chainstate.cpp

@@ -30,6 +30,39 @@
 
 const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
 
+
+//----------------
+// symbols g_stats_client, ValueFromAmount, GetPrettyExceptionStr are re-defined
+// here especially for dash-chainstate binary (kernel), because adding sources
+// containing them pulls too many extra dependencies recursively
+#include <stats/client.h>
+std::unique_ptr<StatsdClient> g_stats_client{std::make_unique<StatsdClient>()};
+
+UniValue ValueFromAmount(const CAmount amount)
+{
+    static_assert(COIN > 1);
+    int64_t quotient = amount / COIN;
+    int64_t remainder = amount % COIN;
+    if (amount < 0) {
+        quotient = -quotient;
+        remainder = -remainder;
+    }
+    return UniValue(UniValue::VNUM,
+            strprintf("%s%d.%08d", amount < 0 ? "-" : "", quotient, remainder));
+}
+std::string GetPrettyExceptionStr(const std::exception_ptr& e)
+{
+    try {
+        // rethrow and catch the exception as there is no other way to reliably cast to the real type (not possible with RTTI)
+        std::rethrow_exception(e);
+    } catch (const std::exception& e2) {
+        return e2.what();
+    } catch (...) {
+        throw;
+    }
+}
+//////////////////////
+
 int main(int argc, char* argv[])
 {
     // SETUP: Argument parsing and handling