Core/Config: Implement config override with env vars (#26811)

* Core/Config: Implement config override with env vars

Implement overriding of configuration from the .conf file with environment variables.
Environment variables keys are autogenerated based on the keys defined in .conf file.
Usage example:
$ export TC_DATA_DIR=/usr
$ TC_WORLD_SERVER_PORT=8080 ./worldserver

* Core/Config Fix typo in logs

Co-authored-by: Giacomo Pozzoni <giacomopoz@gmail.com>

* Core/Config Fix code style in EnvVarForIniKey

Co-authored-by: Shauren <shauren.trinity@gmail.com>

* Update tests/common/Config.cpp

* Apply suggestions from code review

Co-authored-by: Peter Keresztes Schmidt <carbenium@outlook.com>

* Apply suggestions from code review

Co-authored-by: Peter Keresztes Schmidt <carbenium@outlook.com>

Co-authored-by: Anton Popovichenko <anton.popovichenko@mendix.com>
Co-authored-by: Giacomo Pozzoni <giacomopoz@gmail.com>
Co-authored-by: Shauren <shauren.trinity@gmail.com>
Co-authored-by: Peter Keresztes Schmidt <carbenium@outlook.com>
(cherry picked from commit 1ddd9dc19cc1df1a1ab8c6123283999f9dea6760)

1 files changed, 5 insertions, 0 deletions

diff --git a/src/server/bnetserver/Main.cpp b/src/server/bnetserver/Main.cpp
index 1062233dc7d..65d04438574 100644
--- a/src/server/bnetserver/Main.cpp
+++ b/src/server/bnetserver/Main.cpp
@@ -113,6 +113,8 @@ int main(int argc, char** argv)
         return 1;
     }
 
+    std::vector<std::string> overriddenKeys = sConfigMgr->OverrideWithEnvVariablesIfAny();
+
     sLog->RegisterAppender<AppenderDB>();
     sLog->Initialize(nullptr);
 
@@ -129,6 +131,9 @@ int main(int argc, char** argv)
         }
     );
 
+    for (std::string const& key : overriddenKeys)
+        TC_LOG_INFO("server.authserver", "Configuration field '%s' was overridden with environment variable.", key.c_str());
+
     // Seed the OpenSSL's PRNG here.
     // That way it won't auto-seed when calling BigNumber::SetRand and slow down the first world login
     BigNumber seed;