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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_event_connect.h>
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11 #include <nginx.h>
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12
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13
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14 /* AF_INET only */
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15
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16 int ngx_event_connect_peer(ngx_peer_connection_t *pc)
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17 {
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18 int rc;
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19 ngx_uint_t instance;
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20 u_int event;
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21 time_t now;
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22 ngx_err_t err;
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23 ngx_peer_t *peer;
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24 ngx_socket_t s;
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25 ngx_event_t *rev, *wev;
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26 ngx_connection_t *c;
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27 ngx_event_conf_t *ecf;
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28 struct sockaddr_in addr;
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29
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30 now = ngx_time();
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31
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32 /* ngx_lock_mutex(pc->peers->mutex); */
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33
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34 if (pc->peers->last_cached) {
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35
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36 /* cached connection */
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37
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38 c = pc->peers->cached[pc->peers->last_cached];
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39 pc->peers->last_cached--;
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40
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41 /* ngx_unlock_mutex(pc->peers->mutex); */
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42
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43 #if (NGX_THREADS)
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44 c->read->lock = c->read->own_lock;
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45 c->write->lock = c->write->own_lock;
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46 #endif
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47
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48 pc->connection = c;
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49 pc->cached = 1;
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50 return NGX_OK;
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51 }
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52
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53 pc->cached = 0;
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54 pc->connection = NULL;
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55
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56 if (pc->peers->number == 1) {
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57 peer = &pc->peers->peers[0];
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58
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59 } else {
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60
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61 /* there are several peers */
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62
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63 if (pc->tries == pc->peers->number) {
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64
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65 /* it's a first try - get a current peer */
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66
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67 pc->cur_peer = pc->peers->current++;
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68
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69 if (pc->peers->current >= pc->peers->number) {
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70 pc->peers->current = 0;
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71 }
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72 }
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73
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74 if (pc->peers->max_fails == 0) {
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75 peer = &pc->peers->peers[pc->cur_peer];
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76
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77 } else {
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78
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79 /* the peers support a fault tolerance */
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80
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81 for ( ;; ) {
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82 peer = &pc->peers->peers[pc->cur_peer];
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83
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84 if (peer->fails <= pc->peers->max_fails
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85 || (now - peer->accessed > pc->peers->fail_timeout))
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86 {
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87 break;
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88 }
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89
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90 pc->cur_peer++;
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91
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92 if (pc->cur_peer >= pc->peers->number) {
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93 pc->cur_peer = 0;
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94 }
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95
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96 pc->tries--;
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97
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98 if (pc->tries == 0) {
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99 /* ngx_unlock_mutex(pc->peers->mutex); */
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100
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101 return NGX_ERROR;
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102 }
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103 }
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104 }
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105 }
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106
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107 /* ngx_unlock_mutex(pc->peers->mutex); */
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108
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109
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110 s = ngx_socket(AF_INET, SOCK_STREAM, IPPROTO_IP, 0);
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111
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112 if (s == -1) {
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113 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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114 ngx_socket_n " failed");
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115 return NGX_ERROR;
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116 }
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117
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118
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119 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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120
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121 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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122
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123 if ((ngx_uint_t) s >= ecf->connections) {
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124
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125 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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126 "socket() returned socket #%d while only %d "
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127 "connections was configured, closing the socket",
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128 s, ecf->connections);
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129
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130 if (ngx_close_socket(s) == -1) {
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131 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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132 ngx_close_socket_n "failed");
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133 }
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134
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135 /* TODO: sleep for some time */
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136
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137 return NGX_ERROR;
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138 }
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139
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140
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141 if (pc->rcvbuf) {
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142 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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143 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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144 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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145 "setsockopt(SO_RCVBUF) failed");
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146
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147 if (ngx_close_socket(s) == -1) {
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148 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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149 ngx_close_socket_n " failed");
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150 }
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151
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152 return NGX_ERROR;
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153 }
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154 }
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155
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156 if (ngx_nonblocking(s) == -1) {
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157 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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158 ngx_nonblocking_n " failed");
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159
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160 if (ngx_close_socket(s) == -1) {
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161 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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162 ngx_close_socket_n " failed");
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163 }
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164
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165 return NGX_ERROR;
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166 }
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167
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168 #if (WIN32)
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169 /*
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170 * Winsock assignes a socket number divisible by 4
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171 * so to find a connection we divide a socket number by 4.
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172 */
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173
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174 if (s % 4) {
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175 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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176 ngx_socket_n
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177 " created socket %d, not divisible by 4", s);
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178 exit(1);
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179 }
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180
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181 c = &ngx_cycle->connections[s / 4];
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182 rev = &ngx_cycle->read_events[s / 4];
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183 wev = &ngx_cycle->write_events[s / 4];
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184
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185 #else
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186
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187 c = &ngx_cycle->connections[s];
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188 rev = &ngx_cycle->read_events[s];
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189 wev = &ngx_cycle->write_events[s];
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190
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191 #endif
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192
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193 instance = rev->instance;
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194
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195 #if (NGX_THREADS)
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196
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197 if (*(&c->lock)) {
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198 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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199 "spinlock in connect, fd:%d", s);
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200 ngx_spinlock(&c->lock, 1000);
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201 ngx_unlock(&c->lock);
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202 }
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203
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204 #endif
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205
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206 ngx_memzero(c, sizeof(ngx_connection_t));
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207 ngx_memzero(rev, sizeof(ngx_event_t));
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208 ngx_memzero(wev, sizeof(ngx_event_t));
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209
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210 rev->instance = !instance;
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211 wev->instance = !instance;
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212
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213 rev->index = NGX_INVALID_INDEX;
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214 wev->index = NGX_INVALID_INDEX;
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215
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216 rev->data = c;
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217 wev->data = c;
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218
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219 c->read = rev;
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220 c->write = wev;
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221 wev->write = 1;
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222
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223 c->log = pc->log;
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224 rev->log = pc->log;
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225 wev->log = pc->log;
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226
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227 c->fd = s;
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228
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229 c->log_error = pc->log_error;
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230
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231 pc->connection = c;
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232
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233 /*
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234 * TODO: MT: - atomic increment (x86: lock xadd)
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235 * or protection by critical section or mutex
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236 *
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237 * TODO: MP: - allocated in a shared memory
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238 * - atomic increment (x86: lock xadd)
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239 * or protection by critical section or mutex
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240 */
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241
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242 c->number = ngx_atomic_inc(ngx_connection_counter);
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243
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244 #if (NGX_THREADS)
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245 rev->lock = pc->lock;
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246 wev->lock = pc->lock;
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247 rev->own_lock = &c->lock;
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248 wev->own_lock = &c->lock;
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249 #endif
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250
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251 if (ngx_add_conn) {
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252 if (ngx_add_conn(c) == NGX_ERROR) {
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253 return NGX_ERROR;
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254 }
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255 }
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256
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257 ngx_memzero(&addr, sizeof(struct sockaddr_in));
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258
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259 addr.sin_family = AF_INET;
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260 addr.sin_port = peer->port;
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261 addr.sin_addr.s_addr = peer->addr;
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262
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263 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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264 "connect to %s, #%d", peer->addr_port_text.data, c->number);
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265
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266 rc = connect(s, (struct sockaddr *) &addr, sizeof(struct sockaddr_in));
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267
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268 if (rc == -1) {
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269 err = ngx_socket_errno;
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270
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271 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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272
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273 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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274 ngx_connection_error(c, err, "connect() failed");
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275
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276 if (ngx_close_socket(s) == -1) {
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277 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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278 ngx_close_socket_n " failed");
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279 }
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280
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281 c->fd = (ngx_socket_t) -1;
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282
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283 return NGX_CONNECT_ERROR;
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284 }
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285 }
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286
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287 if (ngx_add_conn) {
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288 if (rc == -1) {
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289 /* NGX_EINPROGRESS */
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290 return NGX_AGAIN;
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291 }
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292
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293 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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294 return NGX_OK;
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295 }
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296
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297 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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298
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299 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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300 "connect(): %d", rc);
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301
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0
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302 /* aio, iocp */
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303
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304 if (ngx_blocking(s) == -1) {
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305 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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306 ngx_blocking_n " failed");
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307
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308 if (ngx_close_socket(s) == -1) {
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309 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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310 ngx_close_socket_n " failed");
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311 }
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312
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313 return NGX_ERROR;
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314 }
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315
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316 /*
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4
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317 * FreeBSD aio allows to post operation on non-connected socket.
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0
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318 * NT does not support it.
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319 *
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320 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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321 */
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322
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323 rev->ready = 1;
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324 wev->ready = 1;
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325
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326 return NGX_OK;
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327 }
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328
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329 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */
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330 event = NGX_CLEAR_EVENT;
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331
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332 } else { /* select, poll, /dev/poll */
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333 event = NGX_LEVEL_EVENT;
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334 }
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335
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336 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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337 return NGX_ERROR;
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338 }
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339
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340 if (rc == -1) {
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341
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342 /* NGX_EINPROGRESS */
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343
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344 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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345 return NGX_ERROR;
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346 }
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347
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348 return NGX_AGAIN;
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349 }
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350
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351 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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352
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353 wev->ready = 1;
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354
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355 return NGX_OK;
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356 }
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357
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358
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359 void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
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360 {
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361 time_t now;
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362
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363 now = ngx_time();
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364
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365 /* ngx_lock_mutex(pc->peers->mutex); */
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366
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367 pc->peers->peers[pc->cur_peer].fails++;
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368 pc->peers->peers[pc->cur_peer].accessed = now;
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369
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370 /* ngx_unlock_mutex(pc->peers->mutex); */
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371
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372 pc->cur_peer++;
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373
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374 if (pc->cur_peer >= pc->peers->number) {
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375 pc->cur_peer = 0;
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376 }
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377
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378 pc->tries--;
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379
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380 return;
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381 }
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