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