Makes print_log to write a file log; Colorizes server messages

src/components/utils/utils.c

@@ -1,9 +1,63 @@
 #include "utils.h"
+#include <asm-generic/errno-base.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <unistd.h>
+
+#define LOGFILE_NAME "bbs-server.log"
+/* COLORS */
+#define INFO_COLOR "\033[0m"
+#define WARN_COLOR "\033[0m\033[33m"
+#define ERR_COLOR "\033[0m\033[31m"
+#define FATAL_COLOR "\033[0m\033[31m\033[1m"
+#define FATAL_COLOR "\033[0m\033[31m\033[1m"
+#define SUCCESS_COLOR "\033[0m\033[32m"
+#define FAIL_COLOR "\033[0m\033[35m"
+
+static struct {
+  int fd;
+} file;
+
+int open_log_file(char *path, int *_fd) {
+  int fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0666);
+  if (fd == -1) {
+    return errno;
+  }
+  *_fd = fd;
+  return 0;
+}
+
+void close_log_file() { close(file.fd); }
+
+/* TODO: create recursive backups 5 times */
+int init_log_file() {
+  int fd;
+  int res = open_log_file(LOGFILE_NAME, &fd);
+  if (res == EEXIST) {
+    int res = open_log_file(LOGFILE_NAME ".old", &fd);
+    if (res == EEXIST) {
+      unlink(LOGFILE_NAME ".old");
+    } else {
+      close(fd);
+    }
+    rename(LOGFILE_NAME, LOGFILE_NAME ".old");
+    res = open_log_file(LOGFILE_NAME, &fd);
+    if (res != 0) {
+      return -1;
+    }
+  }
+  file.fd = fd;
+  return fd;
+}
+
+int write_into_log_file(char *fmt, va_list args) {
+  return vdprintf(file.fd, fmt, args);
+}
 
 int print_log(FILE *output, enum pl_type type, const char *format_message,
               ...) {
@@ -15,24 +69,39 @@ int print_log(FILE *output, enum pl_type type, const char *format_message,
   va_list args;
   sprintf(date_preffix, "[%s] ", ctime(&t));
   strftime(date_preffix, 128, "[%d.%m.%y %T]", tm);
+  const char *tcolor;
   switch (type) {
   case pl_info:
-    uff_str = "%s %s";
+    uff_str = "%s%s %s";
+    tcolor = INFO_COLOR;
     break;
   case pl_warning:
-    uff_str = "%s Warning: %s";
+    uff_str = "%s%s Warning: %s";
+    tcolor = WARN_COLOR;
     break;
   case pl_error:
-    uff_str = "%s Error: %s";
+    uff_str = "%s%s Error: %s";
+    tcolor = ERR_COLOR;
     break;
   case pl_fatal:
-    uff_str = "%s Fatal: %s";
+    uff_str = "%s%s Fatal: %s";
+    tcolor = FATAL_COLOR;
+    break;
+  case pl_success:
+    uff_str = "%s%s %s";
+    tcolor = SUCCESS_COLOR;
+    break;
+  case pl_fail:
+    uff_str = "%s%s Fail: %s";
+    tcolor = FAIL_COLOR;
     break;
   }
-  char *uf_str = malloc(strlen(date_preffix) + 16 + strlen(format_message) + 4);
-  sprintf(uf_str, uff_str, date_preffix, format_message);
+  char *uf_str = malloc(strlen(date_preffix) + 32 + strlen(format_message) + 4);
+  sprintf(uf_str, uff_str, tcolor, date_preffix, format_message);
   va_start(args, format_message);
   ret = vfprintf(output, uf_str, args);
+  write_into_log_file(uf_str + strlen(tcolor), args);
+  free(uf_str);
   va_end(args);
   return ret;
 }