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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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10
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16 ngx_int_t ngx_event_connect_peer(ngx_peer_connection_t *pc)
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0
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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
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29 now = ngx_time();
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30
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31 /* ngx_lock_mutex(pc->peers->mutex); */
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32
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33 if (pc->peers->last_cached) {
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34
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35 /* cached connection */
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36
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37 c = pc->peers->cached[pc->peers->last_cached];
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38 pc->peers->last_cached--;
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39
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40 /* ngx_unlock_mutex(pc->peers->mutex); */
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41
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42 #if (NGX_THREADS)
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43 c->read->lock = c->read->own_lock;
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44 c->write->lock = c->write->own_lock;
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45 #endif
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46
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47 pc->connection = c;
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48 pc->cached = 1;
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49 return NGX_OK;
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50 }
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51
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52 pc->cached = 0;
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53 pc->connection = NULL;
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54
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55 if (pc->peers->number == 1) {
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28
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56 peer = &pc->peers->peer[0];
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0
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57
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58 } else {
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59
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60 /* there are several peers */
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61
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62 if (pc->tries == pc->peers->number) {
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63
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64 /* it's a first try - get a current peer */
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65
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28
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66 pc->cur_peer = pc->peers->current;
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67
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68 pc->peers->weight--;
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69
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70 if (pc->peers->weight == 0) {
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71 pc->peers->current++;
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72 }
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0
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73
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74 if (pc->peers->current >= pc->peers->number) {
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75 pc->peers->current = 0;
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76 }
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28
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77
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78 if (pc->peers->weight == 0) {
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79 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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80 }
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0
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81 }
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82
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28
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83 for ( ;; ) {
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84 peer = &pc->peers->peer[pc->cur_peer];
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0
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85
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28
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86 if (peer->fails <= peer->max_fails) {
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87 break;
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88 }
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0
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89
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28
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90 if (now - peer->accessed > peer->fail_timeout) {
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91 peer->fails = 0;
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92 break;
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93 }
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22
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94
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28
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95 pc->cur_peer++;
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0
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96
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28
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97 if (pc->cur_peer >= pc->peers->number) {
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98 pc->cur_peer = 0;
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99 }
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0
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100
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28
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101 pc->tries--;
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0
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102
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28
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103 if (pc->tries == 0) {
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104 /* ngx_unlock_mutex(pc->peers->mutex); */
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0
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105
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28
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106 return NGX_ERROR;
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0
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107 }
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108 }
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109 }
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110
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111 /* ngx_unlock_mutex(pc->peers->mutex); */
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112
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113
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28
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114 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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115
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116 if (s == -1) {
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117 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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118 ngx_socket_n " failed");
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119 return NGX_ERROR;
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120 }
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121
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122
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123 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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124
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125 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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126
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127 if ((ngx_uint_t) s >= ecf->connections) {
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128
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129 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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130 "socket() returned socket #%d while only %d "
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131 "connections was configured, closing the socket",
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132 s, ecf->connections);
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133
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134 if (ngx_close_socket(s) == -1) {
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135 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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136 ngx_close_socket_n "failed");
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137 }
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138
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139 /* TODO: sleep for some time */
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140
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141 return NGX_ERROR;
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142 }
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143
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144
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145 if (pc->rcvbuf) {
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146 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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147 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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148 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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149 "setsockopt(SO_RCVBUF) failed");
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150
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151 if (ngx_close_socket(s) == -1) {
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152 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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153 ngx_close_socket_n " failed");
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154 }
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155
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156 return NGX_ERROR;
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157 }
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158 }
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159
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160 if (ngx_nonblocking(s) == -1) {
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161 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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162 ngx_nonblocking_n " failed");
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163
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164 if (ngx_close_socket(s) == -1) {
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165 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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166 ngx_close_socket_n " failed");
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167 }
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168
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169 return NGX_ERROR;
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170 }
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171
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10
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172 #if (NGX_WIN32)
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173 /*
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174 * Winsock assignes a socket number divisible by 4
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175 * so to find a connection we divide a socket number by 4.
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176 */
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177
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178 if (s % 4) {
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179 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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180 ngx_socket_n
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181 " created socket %d, not divisible by 4", s);
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182 exit(1);
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183 }
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184
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185 c = &ngx_cycle->connections[s / 4];
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186 rev = &ngx_cycle->read_events[s / 4];
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187 wev = &ngx_cycle->write_events[s / 4];
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188
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189 #else
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190
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191 c = &ngx_cycle->connections[s];
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192 rev = &ngx_cycle->read_events[s];
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193 wev = &ngx_cycle->write_events[s];
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194
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195 #endif
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196
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197 instance = rev->instance;
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198
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199 #if (NGX_THREADS)
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200
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201 if (*(&c->lock)) {
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202 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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203 "spinlock in connect, fd:%d", s);
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204 ngx_spinlock(&c->lock, 1000);
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205 ngx_unlock(&c->lock);
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206 }
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207
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208 #endif
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209
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210 ngx_memzero(c, sizeof(ngx_connection_t));
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211 ngx_memzero(rev, sizeof(ngx_event_t));
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212 ngx_memzero(wev, sizeof(ngx_event_t));
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213
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214 rev->instance = !instance;
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215 wev->instance = !instance;
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216
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217 rev->index = NGX_INVALID_INDEX;
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218 wev->index = NGX_INVALID_INDEX;
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219
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220 rev->data = c;
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221 wev->data = c;
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222
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223 c->read = rev;
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224 c->write = wev;
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225 wev->write = 1;
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226
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227 c->log = pc->log;
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228 rev->log = pc->log;
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229 wev->log = pc->log;
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230
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231 c->fd = s;
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232
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233 c->log_error = pc->log_error;
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234
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235 pc->connection = c;
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236
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237 /*
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238 * TODO: MT: - 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 * TODO: MP: - allocated in a shared memory
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242 * - atomic increment (x86: lock xadd)
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243 * or protection by critical section or mutex
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244 */
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245
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246 c->number = ngx_atomic_inc(ngx_connection_counter);
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247
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248 #if (NGX_THREADS)
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249 rev->lock = pc->lock;
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250 wev->lock = pc->lock;
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251 rev->own_lock = &c->lock;
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252 wev->own_lock = &c->lock;
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253 #endif
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254
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255 if (ngx_add_conn) {
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256 if (ngx_add_conn(c) == NGX_ERROR) {
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257 return NGX_ERROR;
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258 }
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259 }
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260
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261 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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262 "connect to %V, #%d", &peer->name, c->number);
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263
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264 rc = connect(s, peer->sockaddr, peer->socklen);
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265
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266 if (rc == -1) {
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267 err = ngx_socket_errno;
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268
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269 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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270
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271 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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272 ngx_connection_error(c, err, "connect() failed");
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273
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274 if (ngx_close_socket(s) == -1) {
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275 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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276 ngx_close_socket_n " failed");
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277 }
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278
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279 c->fd = (ngx_socket_t) -1;
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280
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281 return NGX_CONNECT_ERROR;
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282 }
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283 }
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284
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285 if (ngx_add_conn) {
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286 if (rc == -1) {
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287 /* NGX_EINPROGRESS */
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288 return NGX_AGAIN;
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289 }
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290
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291 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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292 return NGX_OK;
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293 }
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294
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295 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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296
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4
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297 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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298 "connect(): %d", rc);
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299
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300 /* aio, iocp */
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301
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302 if (ngx_blocking(s) == -1) {
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303 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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304 ngx_blocking_n " failed");
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305
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306 if (ngx_close_socket(s) == -1) {
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307 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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308 ngx_close_socket_n " failed");
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309 }
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310
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311 return NGX_ERROR;
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312 }
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313
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314 /*
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4
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315 * FreeBSD aio allows to post operation on non-connected socket.
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316 * NT does not support it.
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317 *
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318 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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319 */
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320
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321 rev->ready = 1;
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322 wev->ready = 1;
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323
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324 return NGX_OK;
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325 }
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326
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327 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */
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328 event = NGX_CLEAR_EVENT;
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329
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330 } else { /* select, poll, /dev/poll */
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331 event = NGX_LEVEL_EVENT;
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332 }
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333
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334 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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335 return NGX_ERROR;
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336 }
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337
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338 if (rc == -1) {
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339
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340 /* NGX_EINPROGRESS */
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341
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342 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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343 return NGX_ERROR;
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344 }
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345
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346 return NGX_AGAIN;
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347 }
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348
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349 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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350
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351 wev->ready = 1;
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352
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353 return NGX_OK;
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354 }
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355
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356
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357 void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
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358 {
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359 time_t now;
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360
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361 now = ngx_time();
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362
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363 /* ngx_lock_mutex(pc->peers->mutex); */
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364
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28
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365 pc->peers->peer[pc->cur_peer].fails++;
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366 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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367
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368 /* ngx_unlock_mutex(pc->peers->mutex); */
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369
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370 pc->cur_peer++;
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371
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372 if (pc->cur_peer >= pc->peers->number) {
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373 pc->cur_peer = 0;
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374 }
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375
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376 pc->tries--;
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377
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378 return;
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379 }
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