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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 ngx_int_t
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14 ngx_event_connect_peer(ngx_peer_connection_t *pc)
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0
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15 {
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92
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16 int rc;
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110
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17 ngx_uint_t level, i;
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92
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18 u_int event;
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19 time_t now;
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20 ngx_err_t err;
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21 ngx_peer_t *peer;
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22 ngx_socket_t s;
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23 ngx_event_t *rev, *wev;
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24 ngx_connection_t *c;
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0
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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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92
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46
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0
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47 return NGX_OK;
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48 }
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49
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50 pc->cached = 0;
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51 pc->connection = NULL;
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52
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53 if (pc->peers->number == 1) {
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28
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54 peer = &pc->peers->peer[0];
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0
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55
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56 } else {
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57
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58 /* there are several peers */
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59
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60 if (pc->tries == pc->peers->number) {
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61
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62 /* it's a first try - get a current peer */
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63
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196
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64 for ( ;; ) {
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65 pc->cur_peer = pc->peers->current;
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66
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67 peer = &pc->peers->peer[pc->cur_peer];
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68
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69 if (peer->max_fails == 0 || peer->fails <= peer->max_fails) {
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70 break;
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71 }
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72
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73 if (now - peer->accessed > peer->fail_timeout) {
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74 peer->fails = 0;
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75 break;
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76 }
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77
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78 pc->peers->current++;
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79
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80 if (pc->peers->current >= pc->peers->number) {
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81 pc->peers->current = 0;
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82 }
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83
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84 pc->tries--;
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85
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86 if (pc->tries) {
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87 continue;
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88 }
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89
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90 goto failed;
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91 }
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28
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92
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212
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93 peer->current_weight--;
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28
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94
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212
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95 if (peer->current_weight == 0) {
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96 peer->current_weight = peer->weight;
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97
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28
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98 pc->peers->current++;
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0
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99
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196
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100 if (pc->peers->current >= pc->peers->number) {
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101 pc->peers->current = 0;
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102 }
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28
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103 }
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0
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104
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196
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105 } else {
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106 for ( ;; ) {
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107 peer = &pc->peers->peer[pc->cur_peer];
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0
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108
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196
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109 if (peer->max_fails == 0 || peer->fails <= peer->max_fails) {
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110 break;
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111 }
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0
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112
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196
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113 if (now - peer->accessed > peer->fail_timeout) {
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114 peer->fails = 0;
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115 break;
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92
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116 }
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117
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196
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118 pc->cur_peer++;
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119
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120 if (pc->cur_peer >= pc->peers->number) {
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121 pc->cur_peer = 0;
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122 }
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0
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123
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196
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124 pc->tries--;
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125
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126 if (pc->tries) {
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127 continue;
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128 }
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129
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130 goto failed;
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0
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131 }
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212
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132
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133 peer->current_weight--;
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134
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135 if (peer->current_weight == 0) {
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136 peer->current_weight = peer->weight;
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137
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138 if (pc->cur_peer == pc->peers->current) {
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139 pc->peers->current++;
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140
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141 if (pc->peers->current >= pc->peers->number) {
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142 pc->peers->current = 0;
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143 }
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144 }
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145 }
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0
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146 }
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147 }
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148
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149 /* ngx_unlock_mutex(pc->peers->mutex); */
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150
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151
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28
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152 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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153
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58
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154 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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155 "socket %d", s);
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156
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0
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157 if (s == -1) {
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158 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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159 ngx_socket_n " failed");
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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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92
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164 c = ngx_get_connection(s, pc->log);
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0
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165
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92
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166 if (c == NULL) {
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0
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167 if (ngx_close_socket(s) == -1) {
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168 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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169 ngx_close_socket_n "failed");
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170 }
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171
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172 return NGX_ERROR;
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173 }
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174
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175 if (pc->rcvbuf) {
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176 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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112
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177 (const void *) &pc->rcvbuf, sizeof(int)) == -1)
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178 {
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0
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179 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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180 "setsockopt(SO_RCVBUF) failed");
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181
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92
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182 ngx_free_connection(c);
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183
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0
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184 if (ngx_close_socket(s) == -1) {
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185 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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186 ngx_close_socket_n " failed");
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187 }
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188
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189 return NGX_ERROR;
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190 }
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191 }
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192
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193 if (ngx_nonblocking(s) == -1) {
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194 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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195 ngx_nonblocking_n " failed");
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196
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92
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197 ngx_free_connection(c);
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198
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0
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199 if (ngx_close_socket(s) == -1) {
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200 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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201 ngx_close_socket_n " failed");
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202 }
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203
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204 return NGX_ERROR;
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205 }
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206
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92
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207 c->recv = ngx_recv;
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208 c->send = ngx_send;
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126
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209 c->recv_chain = ngx_recv_chain;
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92
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210 c->send_chain = ngx_send_chain;
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32
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211
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92
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212 c->log_error = pc->log_error;
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0
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213
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92
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214 if (peer->sockaddr->sa_family != AF_INET) {
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215 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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216 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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132
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217
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218 #if (NGX_SOLARIS)
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219 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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220 c->sendfile = 0;
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221 #endif
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0
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222 }
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223
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110
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224 rev = c->read;
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225 wev = c->write;
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0
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226
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227 rev->log = pc->log;
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228 wev->log = pc->log;
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229
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230 pc->connection = c;
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231
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232 /*
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110
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233 * TODO: MT: - ngx_atomic_fetch_add()
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0
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234 * or protection by critical section or mutex
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235 *
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236 * TODO: MP: - allocated in a shared memory
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110
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237 * - ngx_atomic_fetch_add()
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0
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238 * or protection by critical section or mutex
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239 */
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240
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110
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241 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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242
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243 #if (NGX_THREADS)
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244 rev->lock = pc->lock;
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245 wev->lock = pc->lock;
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246 rev->own_lock = &c->lock;
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247 wev->own_lock = &c->lock;
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248 #endif
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249
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250 if (ngx_add_conn) {
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251 if (ngx_add_conn(c) == NGX_ERROR) {
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252 return NGX_ERROR;
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253 }
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126
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254 }
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0
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255
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92
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256 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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257 "connect to %V, fd:%d #%d", &peer->name, s, c->number);
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0
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258
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28
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259 rc = connect(s, peer->sockaddr, peer->socklen);
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0
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260
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261 if (rc == -1) {
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262 err = ngx_socket_errno;
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263
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264 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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265
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266 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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36
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267
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90
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268 if (err == NGX_ECONNREFUSED || err == NGX_EHOSTUNREACH) {
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269 level = NGX_LOG_ERR;
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270 } else {
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271 level = NGX_LOG_CRIT;
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272 }
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36
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273
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90
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274 ngx_log_error(level, c->log, err, "connect() to %V failed",
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275 &peer->name);
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0
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276
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92
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277 return NGX_DECLINED;
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0
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278 }
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279 }
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280
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281 if (ngx_add_conn) {
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282 if (rc == -1) {
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36
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283
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0
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284 /* NGX_EINPROGRESS */
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36
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285
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0
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286 return NGX_AGAIN;
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287 }
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126
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288
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0
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289 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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32
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290
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291 wev->ready = 1;
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292
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0
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293 return NGX_OK;
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294 }
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295
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296 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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297
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4
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298 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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299 "connect(): %d", rc);
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300
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0
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301 /* aio, iocp */
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302
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303 if (ngx_blocking(s) == -1) {
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304 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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305 ngx_blocking_n " failed");
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306 return NGX_ERROR;
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307 }
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308
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309 /*
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36
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310 * FreeBSD's aio allows to post an operation on non-connected socket.
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0
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311 * NT does not support it.
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126
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312 *
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0
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313 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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314 */
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126
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315
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0
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316 rev->ready = 1;
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317 wev->ready = 1;
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318
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319 return NGX_OK;
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320 }
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321
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36
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322 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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323
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324 /* kqueue */
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325
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0
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326 event = NGX_CLEAR_EVENT;
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327
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36
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328 } else {
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329
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330 /* select, poll, /dev/poll */
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331
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0
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332 event = NGX_LEVEL_EVENT;
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333 }
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334
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335 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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336 return NGX_ERROR;
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337 }
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338
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339 if (rc == -1) {
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340
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341 /* NGX_EINPROGRESS */
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342
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343 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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344 return NGX_ERROR;
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345 }
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346
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347 return NGX_AGAIN;
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348 }
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349
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350 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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351
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352 wev->ready = 1;
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353
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354 return NGX_OK;
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196
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355
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356 failed:
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357
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358 /* all peers failed, mark them as live for quick recovery */
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359
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360 for (i = 0; i < pc->peers->number; i++) {
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361 pc->peers->peer[i].fails = 0;
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362 }
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363
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364 /* ngx_unlock_mutex(pc->peers->mutex); */
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365
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366 return NGX_BUSY;
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0
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367 }
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368
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369
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36
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370 void
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74
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371 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down)
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0
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372 {
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212
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373 time_t now;
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374 ngx_peer_t *peer;
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0
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375
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74
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376 if (down) {
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377 now = ngx_time();
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0
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378
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74
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379 /* ngx_lock_mutex(pc->peers->mutex); */
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0
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380
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212
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381 peer = &pc->peers->peer[pc->cur_peer];
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382
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383 peer->fails++;
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384 peer->accessed = now;
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385
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386 if (peer->current_weight > 1) {
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387 peer->current_weight /= 2;
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388 }
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0
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389
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74
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390 /* ngx_unlock_mutex(pc->peers->mutex); */
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391 }
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0
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392
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393 pc->cur_peer++;
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394
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395 if (pc->cur_peer >= pc->peers->number) {
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396 pc->cur_peer = 0;
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397 }
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398
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94
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399 if (pc->tries) {
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400 pc->tries--;
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401 }
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0
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402 }
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