add logging code and get it setup

.gitignore

@@ -1,2 +1,3 @@
 *.out
 *.o
+/logs

Makefile

@@ -5,7 +5,7 @@ RELEASE_FLAGS = -Wall -Wextra
 LFLAGS = -lpthread
 
 # Source files
-SRCS = webserver.c client_handler.c request_handler.c http_stuff.c response_builder.c
+SRCS = webserver.c client_handler.c request_handler.c http_stuff.c response_builder.c logging.c
 
 # Object files definition
 OBJS = $(SRCS:.c=.o)

logging.c

@@ -0,0 +1,68 @@
+#include "logging.h"
+
+FILE* log_file = NULL;
+
+pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+int log_level = LOG_DEBUG;  // Should pull from env variables eventually
+
+void set_log_level(int level) { log_level = level; }
+
+void open_log_file() {
+    log_file = fopen(LOG_FILE_NAME, "a");
+    if (log_file == NULL) {
+        perror("Failed to open log file\n");
+    }
+}
+
+void close_log_file() {
+    if (log_file != NULL) {
+        fclose(log_file);
+        log_file = NULL;
+    }
+}
+
+void log_message(int level, const char* fmt, ...) {
+    if (level < log_level) {
+        return;
+    }
+    char timestamp[32];
+    time_t now = time(NULL);
+    struct tm* timeinfo = localtime(&now);
+    strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", timeinfo);
+
+    char* level_str = level == LOG_DEBUG  ? "DEBUG"
+                      : level == LOG_INFO ? "INFO"
+                      : level == LOG_WARN ? "WARN"
+                                          : "ERROR";
+
+    // Use variadic arguments to format string
+    va_list args;
+    va_start(args, fmt);
+
+    // Log to console
+    fprintf(stderr, "[%s] [%s] ", timestamp, level_str);
+    vfprintf(stderr, fmt, args);
+    fprintf(stderr, "\n");
+
+    // Reset variadic arguments
+    va_end(args);
+    va_start(args, fmt);
+
+    // Log to file
+    pthread_mutex_lock(&log_mutex);
+    if (log_file == NULL) {
+        open_log_file();
+    }
+    if (log_file == NULL) {
+        perror("Failed to open log file\n");
+    }
+    if (log_file != NULL) {
+        fprintf(log_file, "[%s] [%s] ", timestamp, level_str);
+        vfprintf(log_file, fmt, args);
+        fprintf(log_file, "\n");
+    }
+    fflush(log_file);
+    pthread_mutex_unlock(&log_mutex);
+    va_end(args);
+}

logging.h

@@ -0,0 +1,21 @@
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <time.h>
+
+#define LOG_FILE_NAME "./logs/log.txt"
+
+#define LOG_DEBUG 0
+#define LOG_INFO 1
+#define LOG_WARN 2
+#define LOG_ERROR 3
+
+void set_log_level(int level);
+
+void log_message(int level, const char* fmt, ...);
+
+void open_log_file();
+
+void close_log_file();

webserver.c

@@ -9,17 +9,21 @@
 #include <unistd.h>
 
 #include "client_handler.h"
+#include "logging.h"
 
 struct sockaddr_in server_addr;
 #define DEBUG 1
 
 int main() {
+    open_log_file();
+    set_log_level(DEBUG ? LOG_DEBUG : LOG_INFO);
     // Create socket
     int server = socket(AF_INET, SOCK_STREAM, 0);
     if (server < 0) {
-        perror("socket creation failed");
+        log_message(LOG_ERROR, "Socket creation failed");
         exit(1);
     }
+    log_message(LOG_INFO, "Socket created");
 
     // Socket address config
     server_addr.sin_family = AF_INET;
@@ -27,6 +31,7 @@ int main() {
     server_addr.sin_port = htons(8080);
     // Allow reuse of port when debugging
     if (DEBUG) {
+        log_message(LOG_DEBUG, "Allowing reuse of port");
         int reuse = 1;
         setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int));
     }
@@ -34,13 +39,13 @@ int main() {
     // Bind socket
     if (bind(server, (struct sockaddr *)&server_addr, sizeof(server_addr)) <
         0) {
-        perror("bind failed");
+        log_message(LOG_ERROR, "Socket bind failed");
         exit(1);
     }
 
     // Listen for connections
     if (listen(server, 5) < 0) {
-        perror("listen failed");
+        log_message(LOG_ERROR, "Socket listen failed");
         exit(1);
     }
 
@@ -62,7 +67,7 @@ int main() {
                 if (c == 'q') {
                     close(server);
                     shutdown(server, SHUT_RDWR);
-                    printf("Server closed\n");
+                    log_message(LOG_INFO, "Shutting down server");
                     break;
                 }
             }
@@ -76,7 +81,7 @@ int main() {
                 *client = accept(server, (struct sockaddr *)&client_addr,
                                  &client_len);
                 if (*client < 0) {
-                    perror("Failed to accept client");
+                    log_message(LOG_ERROR, "Socket accept failed");
                     continue;
                 }
 
@@ -86,6 +91,6 @@ int main() {
             }
         }
     }
-
+    close_log_file();
     return 0;
 }