Implement file logging functionality with FileChannel class and update Log class to support file output

.gitignore

@@ -5,3 +5,4 @@ build
 
 
 
+webserv.log

webserv/log/FileChannel.cpp

@@ -0,0 +1,55 @@
+#include "webserv/log/LogLevel.hpp"
+#include <webserv/log/FileChannel.hpp>
+
+#include <chrono>
+#include <iostream>
+
+
+FileChannel::FileChannel(const std::string &filename)
+    : filename_(filename),
+      fileStream_(filename, std::ios::trunc)
+{
+    if (!fileStream_.is_open())
+    {
+        std::cerr << "Failed to open log file: " << filename << '\n';
+    }
+}
+
+FileChannel::~FileChannel()
+{
+    if (fileStream_.is_open())
+    {
+        fileStream_.close();
+    }
+}
+
+void FileChannel::log(LogLevel &logLevel, const std::string &message,
+                      const std::map<std::string, std::string> &context)
+{
+    if (!fileStream_.is_open())
+    {
+        std::cerr << "Log file is not open: " << filename_ << '\n';
+        return;
+    }
+
+    // Get the current time
+    auto now = std::chrono::system_clock::now();
+    auto now_c = std::chrono::system_clock::to_time_t(now);
+    std::tm *tm = std::localtime(&now_c);
+
+    // Format the log message
+    fileStream_ << "[" << std::put_time(tm, "%Y-%m-%d %H:%M:%S") << "] "
+                 << "[" << logLevelToString(logLevel) << "] " << message << '\n';
+
+    // Log the context if it exists
+    if (!context.empty())
+    {
+        fileStream_ << "Context:" << '\n';
+        for (const auto &[key, value] : context)
+        {
+            fileStream_ << "  " << key << ": " << value << '\n';
+        }
+    }
+    fileStream_ << std::flush;
+}
+

webserv/log/FileChannel.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <webserv/log/Channel.hpp>
+#include <webserv/log/LogLevel.hpp>
+
+#include <string>
+#include <fstream>
+#include <map>
+
+class FileChannel : public Channel
+{
+  public:
+    FileChannel(const std::string &filename);
+
+    FileChannel(const FileChannel &other) = delete;
+    FileChannel(const FileChannel &&other) = delete;
+    FileChannel &operator=(const FileChannel &other) = delete;
+    FileChannel &&operator=(const FileChannel &&other) = delete;
+
+    ~FileChannel();
+    void log(LogLevel &logLevel, const std::string &message,
+             const std::map<std::string, std::string> &context = {}) override;
+
+  private:
+    std::string filename_;
+    std::ofstream fileStream_;
+};  

webserv/log/Log.cpp

@@ -1,16 +1,37 @@
-#include "webserv/log/StdoutChannel.hpp"
-#include <webserv/log/Log.hpp>
+#include <chrono>
 #include <filesystem>
+#include <iostream>
+#include <webserv/log/FileChannel.hpp>
+#include <webserv/log/Log.hpp>
+#include <webserv/log/StdoutChannel.hpp>
 
 Log::Log()
 {
+    // get start time
+    start_time_ = std::chrono::steady_clock::now();
     channels_.insert({"stdout", std::unique_ptr<Channel>(new StdoutChannel())});
 }
 
+void Log::setFile(const std::string &filename)
+{
+    Log &log = getInstance();
+    if (log.channels_.contains("file"))
+    {
+        log.channels_.erase("file");
+    }
+    try
+    {
+        log.channels_.insert({"file", std::unique_ptr<Channel>(new FileChannel(filename))});
+    }
+    catch (const std::exception &e)
+    {
+        std::cerr << "Failed to set log file: " << e.what() << '\n';
+    }
+}
+
 Log &Log::getInstance()
 {
     static Log instance;
-
     return instance;
 }
 
@@ -24,7 +45,8 @@ void Log::log(LogLevel level, const std::string &message, const std::string &cha
     }
 }
 void Log::log(LogLevel level, const std::string &message, const std::string &file, int line,
-              const std::string &function, const std::string &channel, const std::map<std::string, std::string> &context)
+              const std::string &function, const std::string &channel,
+              const std::map<std::string, std::string> &context)
 {
     auto it = channels_.find(channel);
     if (it != channels_.end())
@@ -47,6 +69,14 @@ std::string extendedMessage;
     }
 }
 
+int Log::getElapsedTime()
+{
+    Log &log = Log::getInstance();
+    auto now = std::chrono::steady_clock::now();
+    auto elapsed = std::chrono::duration_cast<std::chrono::seconds>(now - log.start_time_).count();
+    return static_cast<int>(elapsed);
+}
+
 void Log::static_log(LogLevel level, const std::string &message, const std::string &file, int line,
                      const std::string &function, const std::string &channel,
                      const std::map<std::string, std::string> &context)

webserv/log/Log.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <chrono>
 #include <map>
 #include <memory>
 #include <string>
@@ -7,8 +8,7 @@
 #include <webserv/log/Channel.hpp>
 #include <webserv/log/LogLevel.hpp>
 
-#define LOG(level, message)                                                                                           \
-    Log::static_log((level), (message), __FILE__, __LINE__, __FUNCTION__, "stdout", {})
+#define LOG(level, message) Log::static_log((level), (message), __FILE__, __LINE__, __FUNCTION__, "file", {})
 
 #define LOG_TRACE(message) LOG(LogLevel::LOGLVL_TRACE, message)
 #define LOG_INFO(message) LOG(LogLevel::LOGLVL_INFO, message)
@@ -27,6 +27,8 @@ class Log
     Log &operator=(const Log &other) = delete;
     Log &&operator=(const Log &&other) = delete;
 
+    static void setFile(const std::string &filename);
+
     void log(LogLevel level, const std::string &message, const std::string &channel = "stdout",
              const std::map<std::string, std::string> &context = {});
 
@@ -34,6 +36,8 @@ class Log
              const std::string &function = "", const std::string &channel = "stdout",
              const std::map<std::string, std::string> &context = {});
 
+    static int getElapsedTime();
+
     static void static_log(LogLevel level, const std::string &message, const std::string &file = "", int line = -1,
                            const std::string &function = "", const std::string &channel = "stdout",
                            const std::map<std::string, std::string> &context = {});
@@ -47,8 +51,10 @@ class Log
 
   private:
     Log();
+
     ~Log() = default;
     static Log &getInstance();
 
+    std::chrono::steady_clock::time_point start_time_;
     std::unordered_map<std::string, std::unique_ptr<Channel>> channels_;
 };

webserv/log/StdoutChannel.cpp

@@ -1,10 +1,12 @@
 #include <iostream>
 #include <map>
 #include <webserv/log/StdoutChannel.hpp>
+#include <iomanip>
 
 void StdoutChannel::log(LogLevel &logLevel, const std::string &message,
                         const std::map<std::string, std::string> &context)
 {
+    std::cout << "[" << std::setw(3) << std::setfill('0') << Log::getElapsedTime() << "] ";
     std::string prefix = "[" + logLevelToColoredString(logLevel) + "] ";
     std::cout << prefix;
     std::cout << message;

webserv/main.cpp

@@ -15,16 +15,9 @@ int main(int argc, char **argv)
         std::cerr << "Usage: " << argv[0] << " <config_file_path>\n"; // NOLINT
         return 1;
     }
+    Log::setFile("webserv.log");
     ConfigManager::getInstance().init(argv[1]); // NOLINT
     Server server(ConfigManager::getInstance());
-    LOG_TRACE("Trace message example.");
-    LOG_INFO("Info message example.");
-    LOG_DEBUG("Debug message example.");
-    LOG_WARN("Warning message example.");
-    LOG_ERROR("Error message example.");
-    LOG_FATAL("Fatal message example.");
-
-    Log::info("test log message: server starting...", {{"port", "8080"}, {"mode", "production"}});
     server.start();
 
     return 0;