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0
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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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36
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13 #define NGX_RESOLVER_BUFSIZE 8192
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14
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15
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16 ngx_int_t
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17 ngx_event_connect_peer(ngx_peer_connection_t *pc)
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0
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18 {
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19 int rc;
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20 ngx_uint_t instance;
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21 u_int event;
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22 time_t now;
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23 ngx_err_t err;
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24 ngx_peer_t *peer;
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25 ngx_socket_t s;
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26 ngx_event_t *rev, *wev;
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27 ngx_connection_t *c;
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28 ngx_event_conf_t *ecf;
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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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28
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57 peer = &pc->peers->peer[0];
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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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28
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67 pc->cur_peer = pc->peers->current;
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68
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69 pc->peers->weight--;
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70
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71 if (pc->peers->weight == 0) {
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72 pc->peers->current++;
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73 }
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0
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74
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75 if (pc->peers->current >= pc->peers->number) {
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76 pc->peers->current = 0;
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77 }
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28
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78
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79 if (pc->peers->weight == 0) {
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80 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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81 }
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0
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82 }
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83
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28
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84 for ( ;; ) {
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85 peer = &pc->peers->peer[pc->cur_peer];
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0
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86
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28
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87 if (peer->fails <= peer->max_fails) {
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88 break;
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89 }
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0
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90
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28
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91 if (now - peer->accessed > peer->fail_timeout) {
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92 peer->fails = 0;
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93 break;
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94 }
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22
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95
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28
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96 pc->cur_peer++;
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0
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97
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28
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98 if (pc->cur_peer >= pc->peers->number) {
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99 pc->cur_peer = 0;
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100 }
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0
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101
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28
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102 pc->tries--;
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0
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103
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28
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104 if (pc->tries == 0) {
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105 /* ngx_unlock_mutex(pc->peers->mutex); */
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0
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106
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28
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107 return NGX_ERROR;
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0
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108 }
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109 }
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110 }
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111
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112 /* ngx_unlock_mutex(pc->peers->mutex); */
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113
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114
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28
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115 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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116
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58
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117 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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118 "socket %d", s);
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119
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0
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120 if (s == -1) {
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121 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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122 ngx_socket_n " failed");
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123 return NGX_ERROR;
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124 }
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125
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126
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127 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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128
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129 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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130
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131 if ((ngx_uint_t) s >= ecf->connections) {
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132
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133 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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134 "socket() returned socket #%d while only %d "
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135 "connections was configured, closing the socket",
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136 s, ecf->connections);
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137
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138 if (ngx_close_socket(s) == -1) {
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139 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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140 ngx_close_socket_n "failed");
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141 }
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142
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143 /* TODO: sleep for some time */
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144
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145 return NGX_ERROR;
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146 }
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147
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148
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149 if (pc->rcvbuf) {
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150 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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151 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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152 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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153 "setsockopt(SO_RCVBUF) failed");
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154
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155 if (ngx_close_socket(s) == -1) {
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156 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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157 ngx_close_socket_n " failed");
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158 }
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159
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160 return NGX_ERROR;
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161 }
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162 }
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163
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164 if (ngx_nonblocking(s) == -1) {
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165 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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166 ngx_nonblocking_n " failed");
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167
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168 if (ngx_close_socket(s) == -1) {
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169 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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170 ngx_close_socket_n " failed");
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171 }
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172
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173 return NGX_ERROR;
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174 }
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175
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10
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176 #if (NGX_WIN32)
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32
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177
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0
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178 /*
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179 * Winsock assignes a socket number divisible by 4
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180 * so to find a connection we divide a socket number by 4.
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181 */
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182
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183 if (s % 4) {
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184 ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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185 ngx_socket_n
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186 " created socket %d, not divisible by 4", s);
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187 exit(1);
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188 }
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189
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190 c = &ngx_cycle->connections[s / 4];
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191 rev = &ngx_cycle->read_events[s / 4];
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192 wev = &ngx_cycle->write_events[s / 4];
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193
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194 #else
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195
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196 c = &ngx_cycle->connections[s];
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197 rev = &ngx_cycle->read_events[s];
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198 wev = &ngx_cycle->write_events[s];
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199
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200 #endif
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201
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202 instance = rev->instance;
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203
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204 #if (NGX_THREADS)
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205
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206 if (*(&c->lock)) {
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207 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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208 "spinlock in connect, fd:%d", s);
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209 ngx_spinlock(&c->lock, 1000);
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210 ngx_unlock(&c->lock);
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211 }
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212
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213 #endif
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214
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215 ngx_memzero(c, sizeof(ngx_connection_t));
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216 ngx_memzero(rev, sizeof(ngx_event_t));
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217 ngx_memzero(wev, sizeof(ngx_event_t));
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218
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219 rev->instance = !instance;
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220 wev->instance = !instance;
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221
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222 rev->index = NGX_INVALID_INDEX;
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223 wev->index = NGX_INVALID_INDEX;
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224
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225 rev->data = c;
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226 wev->data = c;
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227
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228 c->read = rev;
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229 c->write = wev;
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230 wev->write = 1;
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231
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232 c->log = pc->log;
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233 rev->log = pc->log;
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234 wev->log = pc->log;
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235
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236 c->fd = s;
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237
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238 c->log_error = pc->log_error;
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239
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32
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240 if (peer->sockaddr->sa_family != AF_INET) {
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241 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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242 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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243 }
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244
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0
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245 pc->connection = c;
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246
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247 /*
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248 * TODO: MT: - atomic increment (x86: lock xadd)
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249 * or protection by critical section or mutex
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250 *
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251 * TODO: MP: - allocated in a shared memory
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252 * - atomic increment (x86: lock xadd)
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253 * or protection by critical section or mutex
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254 */
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255
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256 c->number = ngx_atomic_inc(ngx_connection_counter);
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257
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258 #if (NGX_THREADS)
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259 rev->lock = pc->lock;
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260 wev->lock = pc->lock;
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261 rev->own_lock = &c->lock;
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262 wev->own_lock = &c->lock;
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263 #endif
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264
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265 if (ngx_add_conn) {
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266 if (ngx_add_conn(c) == NGX_ERROR) {
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267 return NGX_ERROR;
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268 }
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269 }
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270
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271 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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272 "connect to %V, #%d", &peer->name, c->number);
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0
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273
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274 rc = connect(s, peer->sockaddr, peer->socklen);
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0
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275
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276 if (rc == -1) {
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277 err = ngx_socket_errno;
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278
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279 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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280
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281 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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282 ngx_connection_error(c, err, "connect() failed");
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283
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36
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284 #if 0
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285 #undef sun
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286 {
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287 struct sockaddr_un *sun;
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288
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289 sun = (struct sockaddr_un *) peer->sockaddr;
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290
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291 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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292 "\"%s\", f:%d, l:%uz",
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293 sun->sun_path, sun->sun_family, peer->socklen);
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0
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294 }
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36
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295 #endif
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0
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296
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297 return NGX_CONNECT_ERROR;
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298 }
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299 }
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300
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301 if (ngx_add_conn) {
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302 if (rc == -1) {
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36
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303
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0
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304 /* NGX_EINPROGRESS */
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36
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305
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0
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306 return NGX_AGAIN;
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307 }
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308
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309 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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32
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310
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311 wev->ready = 1;
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312
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0
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313 return NGX_OK;
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314 }
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315
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316 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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317
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4
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318 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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319 "connect(): %d", rc);
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320
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0
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321 /* aio, iocp */
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322
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323 if (ngx_blocking(s) == -1) {
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324 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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325 ngx_blocking_n " failed");
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326 return NGX_ERROR;
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327 }
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328
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329 /*
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36
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330 * FreeBSD's aio allows to post an operation on non-connected socket.
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0
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331 * NT does not support it.
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332 *
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333 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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334 */
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335
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336 rev->ready = 1;
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337 wev->ready = 1;
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338
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339 return NGX_OK;
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340 }
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341
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36
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342 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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343
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344 /* kqueue */
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345
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0
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346 event = NGX_CLEAR_EVENT;
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347
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36
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348 } else {
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349
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350 /* select, poll, /dev/poll */
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351
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0
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352 event = NGX_LEVEL_EVENT;
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353 }
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354
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355 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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356 return NGX_ERROR;
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357 }
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358
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359 if (rc == -1) {
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360
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361 /* NGX_EINPROGRESS */
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362
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363 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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364 return NGX_ERROR;
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365 }
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366
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367 return NGX_AGAIN;
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368 }
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369
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370 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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371
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372 wev->ready = 1;
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373
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374 return NGX_OK;
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375 }
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376
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377
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36
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378 void
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74
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379 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down)
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0
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380 {
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381 time_t now;
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382
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74
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383 if (down) {
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384 now = ngx_time();
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0
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385
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74
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386 /* ngx_lock_mutex(pc->peers->mutex); */
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0
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387
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74
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388 pc->peers->peer[pc->cur_peer].fails++;
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389 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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390
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74
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391 /* ngx_unlock_mutex(pc->peers->mutex); */
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392 }
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0
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393
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394 pc->cur_peer++;
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395
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396 if (pc->cur_peer >= pc->peers->number) {
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397 pc->cur_peer = 0;
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398 }
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399
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400 pc->tries--;
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401 }
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