Log GpgME errors.

In file WT_APP_ROOT/gpgme.log.

Independently of usual Wt logging.

GpgMELogger.h

@@ -0,0 +1,39 @@
+/* 
+ * File:   GpgMELogger.h
+ * Author: SET - nmset@yandex.com
+ * License : GPL v2
+ * Copyright SET - © 2019
+ *
+ * Created on November 23, 2020, 4:00 PM
+ */
+
+#ifndef GPGMELOGGER_H
+#define GPGMELOGGER_H
+
+#include <Wt/WLogger.h>
+#include <Wt/WApplication.h>
+#include <Wt/WEnvironment.h>
+#include <gpgme++/error.h>
+#include <mutex>
+
+using namespace Wt;
+
+static std::mutex gs_logGpgMEError;
+#define LGE(e) LogGpgMEError(e)
+
+static void LogGpgMEError(const GpgME::Error& e)
+{
+    if (e.code() == 0)
+        return;
+    std::unique_lock<std::mutex> lock(gs_logGpgMEError);
+    const string logfile = WApplication::appRoot() + string("gpgme.log");
+    WLogger logger;
+    logger.setFile(logfile);
+    logger.entry("") << WLogger::timestamp
+            << WLogger::sep << WApplication::instance()->environment().userAgent()
+            << WLogger::sep << std::to_string(e.code())
+            << WLogger::sep << e.asString();
+}
+
+#endif /* GPGMELOGGER_H */
+