src/server/daemon/log.c

Wed, 16 May 2012 12:47:28 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 16 May 2012 12:47:28 +0200
changeset 29
e8619defde14
parent 28
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child 32
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permissions
-rw-r--r--

added event handler

28
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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2011 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <unistd.h>
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33 #include <aio.h>
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34 #include <time.h>
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35
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36 #include "log.h"
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37 #include "../util/strbuf.h"
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38
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39 int is_initialized = 0;
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40
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41 int log_file_fd;
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42 int log_level = 0;
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43
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44 /*
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45 * if the log file is uninitialized, output is written to the ui_buffer
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46 */
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47 sbuf_t *ui_buffer = NULL;
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48
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49 char *log_date_month[] = {
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50 "Jan",
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51 "Feb",
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52 "Mar",
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53 "Apr",
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54 "May",
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55 "Jun",
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56 "Jul",
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57 "Aug",
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58 "Sep",
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59 "Oct",
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60 "Nov",
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61 "Dec"
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62 };
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63
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64 char *log_levels[] = {
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65 "error",
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66 "warning",
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67 "info"
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68 };
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69
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70 int init_log_file(LogConfig *cfg) {
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71 if(is_initialized) {
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72 return 0;
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73 }
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74
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75 /* open the log file */
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76 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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77 log_file_fd = open(cfg->file, O_WRONLY | O_CREAT | O_APPEND, mode);
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78 if(log_file_fd == -1) {
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79 return -1;
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80 }
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81
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82 if(!strcmp(cfg->level, "ERROR")) {
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83 log_level = LOG_LEVEL_ERROR;
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84 } else if(!strcmp(cfg->level, "WARNING")) {
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85 log_level = LOG_LEVEL_WARNING;
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86 } else if(!strcmp(cfg->level, "INFO")) {
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87 log_level = LOG_LEVEL_INFO;
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88 }
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89
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90 if(cfg->log_stdout) {
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91 // TODO
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92 }
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93 if(cfg->log_stderr) {
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94 // TODO
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95 }
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96
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97
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98 is_initialized = 1;
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99
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100 /* if ui_buffer is not NULL, write it to the log file */
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101 if(ui_buffer) {
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102 size_t len = ui_buffer->length;
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103 size_t r;
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104 while(len > 0) {
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105 r = write(log_file_fd, ui_buffer->ptr, ui_buffer->length);
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106 len -= r;
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107 }
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108
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109 sbuf_free(ui_buffer);
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110 }
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111
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112 return 0;
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113 }
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114
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115 void log_uninitialized_writeln(char *str, size_t len) {
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116 if(ui_buffer == NULL) {
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117 ui_buffer = sbuf_new(1024);
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118 if(ui_buffer == NULL) {
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119 return; /* TODO: critical error, exit */
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120 }
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121 }
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122
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123 sstr_t s;
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124 s.ptr = str;
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125 s.length = len;
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126
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127 sbuf_append(ui_buffer, s);
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128 sbuf_put(ui_buffer, '\n');
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129 }
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130
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131 void log_file_writeln(char *str, size_t len) {
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132 if(!is_initialized) {
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133 log_uninitialized_writeln(str, len);
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134 }
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135
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136 struct iovec io[] = {
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137 { str, len },
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138 { "\n", 1}
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139 };
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140
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141 writev(log_file_fd, io, 2); /* TODO: aio */
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142 }
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143
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144 sstr_t log_get_prefix(int level) {
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145 time_t t = time(NULL);
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146
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147 sstr_t d;
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148 d.ptr = NULL;
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149 d.length = 0;
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150
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151 struct tm date;
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152 localtime_r(&t, &date);
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153
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154 char *buf = malloc(64);
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155 int len = snprintf(
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156 buf,
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157 64,
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158 "[%02d/%s/%d:%02d:%02d:%02d] %s : ",
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159 date.tm_mday,
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160 log_date_month[date.tm_mon],
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161 1900 + date.tm_year,
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162 date.tm_hour,
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163 date.tm_min,
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164 date.tm_sec,
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165 log_levels[level]);
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166
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167 if(len > 0) {
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168 d.ptr = buf;
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169 d.length = len;
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170 }
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171
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172 return d;
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173 }
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174
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175
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176 /*
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177 * log api functions
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178 */
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179
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180 int log_ereport(int degree, const char *format, ...) {
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181 if(degree > log_level) {
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182 return 0;
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183 }
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184
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185 sstr_t lmsg;
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186 lmsg.ptr = NULL;
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187 va_list ap;
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188 va_start(ap, format);
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189
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190 /* create log message prefix */
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191 sstr_t lpre = log_get_prefix(degree);
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192
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193 /* format message */
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194 int len = vasprintf(&lmsg.ptr, format, ap);
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195 lmsg.length = len;
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196
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197 /* create message string */
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198 sstr_t message;
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199 message.length = lpre.length + len;
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200 message.ptr = malloc(message.length + 1);
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201
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202 message = sstrncat(2, message, lpre, lmsg);
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203
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204 /* write message to the log file */
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205 log_file_writeln(message.ptr, message.length);
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206
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207 /* cleanup */
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208 free(lmsg.ptr);
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209 free(message.ptr);
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210
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211 return 0;
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212 }

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