From b2dec03e9b3df59550e598906a76e51bf721afa6 Mon Sep 17 00:00:00 2001
From: Szczepan Zalega <szczepan@nitrokey.com>
Date: Fri, 7 Apr 2017 07:06:13 +0200
Subject: Handle print function in logger by functor

Signed-off-by: Szczepan Zalega <szczepan@nitrokey.com>
---
 NitrokeyManager.cc        |  8 +++++++-
 include/NitrokeyManager.h |  1 +
 include/log.h             | 12 ++++++++++++
 log.cc                    | 18 ++++++++++++++++++
 4 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/NitrokeyManager.cc b/NitrokeyManager.cc
index a4ce3a5..3af74ea 100644
--- a/NitrokeyManager.cc
+++ b/NitrokeyManager.cc
@@ -8,7 +8,7 @@
 #include "include/misc.h"
 #include <mutex>
 #include "include/cxx_semantics.h"
-
+#include <functional>
 
 namespace nitrokey{
 
@@ -95,6 +95,12 @@ namespace nitrokey{
         return device != nullptr;
     }
 
+
+    void NitrokeyManager::set_log_function(std::function<void(std::string)> log_function){
+      static nitrokey::log::FunctionalLogHandler handler(log_function);
+      nitrokey::log::Log::instance().set_handler(&handler);
+    }
+
     bool NitrokeyManager::set_default_commands_delay(int delay){
       if (delay < 20){
         LOG("Delay set too low: " + to_string(delay), Loglevel::WARNING);
diff --git a/include/NitrokeyManager.h b/include/NitrokeyManager.h
index a815571..51cd966 100644
--- a/include/NitrokeyManager.h
+++ b/include/NitrokeyManager.h
@@ -139,6 +139,7 @@ namespace nitrokey {
         int get_minor_firmware_version();
 
         explicit NitrokeyManager();
+        void set_log_function(std::function<void(std::string)> log_function);
     private:
 
         static shared_ptr <NitrokeyManager> _instance;
diff --git a/include/log.h b/include/log.h
index 38fc122..e7c790a 100644
--- a/include/log.h
+++ b/include/log.h
@@ -4,6 +4,8 @@
 #include <string>
 #include <cstddef>
 
+#include <functional>
+
 namespace nitrokey {
   namespace log {
 
@@ -29,6 +31,14 @@ namespace nitrokey {
       virtual void print(const std::string &, Loglevel lvl);
     };
 
+    class FunctionalLogHandler : public LogHandler {
+      std::function<void(std::string)> log_function;
+    public:
+      FunctionalLogHandler(std::function<void(std::string)> _log_function);
+      virtual void print(const std::string &, Loglevel lvl);
+
+    };
+
     extern StdlogHandler stdlog_handler;
 
     class Log {
@@ -56,8 +66,10 @@ namespace nitrokey {
 
 #ifdef NO_LOG
 #define LOG(string, level) while(false){}
+#define LOGD(string, level) while(false){}
 #else
 #define LOG(string, level) nitrokey::log::Log::instance()((string), (level))
+#define LOGD(string) nitrokey::log::Log::instance()((string), (nitrokey::log::Loglevel::DEBUG_L2))
 #endif
 
 #endif
diff --git a/log.cc b/log.cc
index 3370959..84f34d7 100644
--- a/log.cc
+++ b/log.cc
@@ -4,6 +4,8 @@
 #include <iomanip>
 #include "log.h"
 
+#include <sstream>
+
 namespace nitrokey {
   namespace log {
 
@@ -39,5 +41,21 @@ namespace nitrokey {
                 << std::put_time(&tm, "%c %z")
                 << "]\t" << str << std::endl;
     }
+
+    void FunctionalLogHandler::print(const std::string &str, Loglevel lvl) {
+      std::time_t t = std::time(nullptr);
+      std::tm tm = *std::localtime(&t);
+
+      std::stringstream s;
+      s << "[" << loglevel_to_str(lvl) << "] ["
+                << std::put_time(&tm, "%c %z")
+                << "]\t" << str << std::endl;
+
+      log_function(s.str());
+    }
+
+    FunctionalLogHandler::FunctionalLogHandler(std::function<void(std::string)> _log_function) {
+      log_function = _log_function;
+    }
   }
 }
-- 
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