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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
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12
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10
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13 ngx_int_t ngx_event_connect_peer(ngx_peer_connection_t *pc)
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0
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14 {
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15 int rc;
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16 ngx_uint_t instance;
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17 u_int event;
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18 time_t now;
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19 ngx_err_t err;
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20 ngx_peer_t *peer;
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21 ngx_socket_t s;
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22 ngx_event_t *rev, *wev;
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23 ngx_connection_t *c;
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24 ngx_event_conf_t *ecf;
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25
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26 now = ngx_time();
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27
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28 /* ngx_lock_mutex(pc->peers->mutex); */
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29
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30 if (pc->peers->last_cached) {
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31
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32 /* cached connection */
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33
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34 c = pc->peers->cached[pc->peers->last_cached];
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35 pc->peers->last_cached--;
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36
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37 /* ngx_unlock_mutex(pc->peers->mutex); */
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38
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39 #if (NGX_THREADS)
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40 c->read->lock = c->read->own_lock;
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41 c->write->lock = c->write->own_lock;
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42 #endif
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43
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44 pc->connection = c;
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45 pc->cached = 1;
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46 return NGX_OK;
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47 }
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48
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49 pc->cached = 0;
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50 pc->connection = NULL;
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51
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52 if (pc->peers->number == 1) {
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28
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53 peer = &pc->peers->peer[0];
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0
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54
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55 } else {
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56
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57 /* there are several peers */
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58
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59 if (pc->tries == pc->peers->number) {
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60
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61 /* it's a first try - get a current peer */
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62
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28
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63 pc->cur_peer = pc->peers->current;
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64
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65 pc->peers->weight--;
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66
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67 if (pc->peers->weight == 0) {
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68 pc->peers->current++;
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69 }
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0
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70
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71 if (pc->peers->current >= pc->peers->number) {
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72 pc->peers->current = 0;
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73 }
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28
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74
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75 if (pc->peers->weight == 0) {
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76 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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77 }
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0
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78 }
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79
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28
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80 for ( ;; ) {
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81 peer = &pc->peers->peer[pc->cur_peer];
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0
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82
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28
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83 if (peer->fails <= peer->max_fails) {
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84 break;
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85 }
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0
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86
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28
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87 if (now - peer->accessed > peer->fail_timeout) {
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88 peer->fails = 0;
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89 break;
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90 }
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22
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91
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28
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92 pc->cur_peer++;
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0
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93
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28
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94 if (pc->cur_peer >= pc->peers->number) {
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95 pc->cur_peer = 0;
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96 }
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0
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97
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28
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98 pc->tries--;
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0
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99
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28
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100 if (pc->tries == 0) {
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101 /* ngx_unlock_mutex(pc->peers->mutex); */
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0
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102
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28
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103 return NGX_ERROR;
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0
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104 }
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105 }
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106 }
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107
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108 /* ngx_unlock_mutex(pc->peers->mutex); */
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109
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110
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28
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111 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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112
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113 if (s == -1) {
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114 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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115 ngx_socket_n " failed");
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116 return NGX_ERROR;
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117 }
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118
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119
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120 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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121
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122 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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123
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124 if ((ngx_uint_t) s >= ecf->connections) {
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125
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126 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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127 "socket() returned socket #%d while only %d "
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128 "connections was configured, closing the socket",
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129 s, ecf->connections);
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130
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131 if (ngx_close_socket(s) == -1) {
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132 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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133 ngx_close_socket_n "failed");
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134 }
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135
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136 /* TODO: sleep for some time */
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137
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138 return NGX_ERROR;
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139 }
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140
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141
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142 if (pc->rcvbuf) {
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143 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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144 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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145 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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146 "setsockopt(SO_RCVBUF) failed");
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147
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148 if (ngx_close_socket(s) == -1) {
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149 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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150 ngx_close_socket_n " failed");
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151 }
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152
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153 return NGX_ERROR;
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154 }
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155 }
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156
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157 if (ngx_nonblocking(s) == -1) {
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158 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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159 ngx_nonblocking_n " failed");
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160
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161 if (ngx_close_socket(s) == -1) {
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162 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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163 ngx_close_socket_n " failed");
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164 }
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165
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166 return NGX_ERROR;
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167 }
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168
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10
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169 #if (NGX_WIN32)
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32
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170
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0
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171 /*
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172 * Winsock assignes a socket number divisible by 4
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173 * so to find a connection we divide a socket number by 4.
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174 */
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175
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176 if (s % 4) {
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177 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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178 ngx_socket_n
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179 " created socket %d, not divisible by 4", s);
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180 exit(1);
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181 }
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182
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183 c = &ngx_cycle->connections[s / 4];
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184 rev = &ngx_cycle->read_events[s / 4];
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185 wev = &ngx_cycle->write_events[s / 4];
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186
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187 #else
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188
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189 c = &ngx_cycle->connections[s];
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190 rev = &ngx_cycle->read_events[s];
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191 wev = &ngx_cycle->write_events[s];
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192
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193 #endif
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194
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195 instance = rev->instance;
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196
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197 #if (NGX_THREADS)
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198
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199 if (*(&c->lock)) {
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200 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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201 "spinlock in connect, fd:%d", s);
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202 ngx_spinlock(&c->lock, 1000);
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203 ngx_unlock(&c->lock);
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204 }
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205
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206 #endif
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207
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208 ngx_memzero(c, sizeof(ngx_connection_t));
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209 ngx_memzero(rev, sizeof(ngx_event_t));
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210 ngx_memzero(wev, sizeof(ngx_event_t));
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211
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212 rev->instance = !instance;
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213 wev->instance = !instance;
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214
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215 rev->index = NGX_INVALID_INDEX;
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216 wev->index = NGX_INVALID_INDEX;
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217
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218 rev->data = c;
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219 wev->data = c;
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220
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221 c->read = rev;
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222 c->write = wev;
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223 wev->write = 1;
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224
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225 c->log = pc->log;
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226 rev->log = pc->log;
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227 wev->log = pc->log;
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228
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229 c->fd = s;
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230
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231 c->log_error = pc->log_error;
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232
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32
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233 if (peer->sockaddr->sa_family != AF_INET) {
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234 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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235 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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236 }
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237
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0
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238 pc->connection = c;
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239
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240 /*
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241 * TODO: MT: - atomic increment (x86: lock xadd)
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242 * or protection by critical section or mutex
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243 *
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244 * TODO: MP: - allocated in a shared memory
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245 * - atomic increment (x86: lock xadd)
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246 * or protection by critical section or mutex
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247 */
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248
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249 c->number = ngx_atomic_inc(ngx_connection_counter);
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250
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251 #if (NGX_THREADS)
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252 rev->lock = pc->lock;
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253 wev->lock = pc->lock;
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254 rev->own_lock = &c->lock;
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255 wev->own_lock = &c->lock;
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256 #endif
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257
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258 if (ngx_add_conn) {
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259 if (ngx_add_conn(c) == NGX_ERROR) {
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260 return NGX_ERROR;
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261 }
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262 }
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263
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264 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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265 "connect to %V, #%d", &peer->name, c->number);
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266
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267 rc = connect(s, peer->sockaddr, peer->socklen);
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268
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269 if (rc == -1) {
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270 err = ngx_socket_errno;
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271
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272 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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273
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274 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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275 ngx_connection_error(c, err, "connect() failed");
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276
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277 if (ngx_close_socket(s) == -1) {
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278 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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279 ngx_close_socket_n " failed");
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280 }
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281
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282 c->fd = (ngx_socket_t) -1;
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283
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284 return NGX_CONNECT_ERROR;
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285 }
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286 }
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287
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288 if (ngx_add_conn) {
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289 if (rc == -1) {
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290 /* NGX_EINPROGRESS */
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291 return NGX_AGAIN;
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292 }
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293
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294 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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32
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295
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296 wev->ready = 1;
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297
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298 return NGX_OK;
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299 }
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300
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301 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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302
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4
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303 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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304 "connect(): %d", rc);
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305
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0
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306 /* aio, iocp */
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307
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308 if (ngx_blocking(s) == -1) {
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309 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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310 ngx_blocking_n " failed");
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311
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312 if (ngx_close_socket(s) == -1) {
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313 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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314 ngx_close_socket_n " failed");
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315 }
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316
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317 return NGX_ERROR;
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318 }
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319
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320 /*
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4
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321 * FreeBSD aio allows to post operation on non-connected socket.
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322 * NT does not support it.
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323 *
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324 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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325 */
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326
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327 rev->ready = 1;
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328 wev->ready = 1;
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329
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330 return NGX_OK;
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331 }
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332
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333 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */
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334 event = NGX_CLEAR_EVENT;
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335
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336 } else { /* select, poll, /dev/poll */
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337 event = NGX_LEVEL_EVENT;
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338 }
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339
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340 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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341 return NGX_ERROR;
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342 }
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343
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344 if (rc == -1) {
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345
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346 /* NGX_EINPROGRESS */
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347
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348 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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349 return NGX_ERROR;
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350 }
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351
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352 return NGX_AGAIN;
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353 }
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354
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355 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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356
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357 wev->ready = 1;
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358
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359 return NGX_OK;
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360 }
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361
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362
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363 void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
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364 {
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365 time_t now;
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366
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367 now = ngx_time();
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368
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369 /* ngx_lock_mutex(pc->peers->mutex); */
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370
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28
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371 pc->peers->peer[pc->cur_peer].fails++;
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372 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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373
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374 /* ngx_unlock_mutex(pc->peers->mutex); */
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375
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376 pc->cur_peer++;
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377
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378 if (pc->cur_peer >= pc->peers->number) {
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379 pc->cur_peer = 0;
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380 }
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381
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382 pc->tries--;
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383
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384 return;
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385 }
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