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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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28
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64 pc->cur_peer = pc->peers->current;
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65
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66 pc->peers->weight--;
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67
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68 if (pc->peers->weight == 0) {
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69 pc->peers->current++;
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70 }
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0
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71
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72 if (pc->peers->current >= pc->peers->number) {
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73 pc->peers->current = 0;
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74 }
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28
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75
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76 if (pc->peers->weight == 0) {
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77 pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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78 }
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0
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79 }
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80
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28
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81 for ( ;; ) {
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82 peer = &pc->peers->peer[pc->cur_peer];
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0
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83
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110
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84 if (peer->max_fails == 0 || peer->fails <= peer->max_fails) {
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28
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85 break;
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86 }
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0
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87
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28
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88 if (now - peer->accessed > peer->fail_timeout) {
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89 peer->fails = 0;
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90 break;
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91 }
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22
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92
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28
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93 pc->cur_peer++;
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0
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94
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28
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95 if (pc->cur_peer >= pc->peers->number) {
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96 pc->cur_peer = 0;
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97 }
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0
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98
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28
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99 pc->tries--;
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0
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100
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28
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101 if (pc->tries == 0) {
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92
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102
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103 /* all peers failed, mark them as live for quick recovery */
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104
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105 for (i = 0; i < pc->peers->number; i++) {
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106 pc->peers->peer[i].fails = 0;
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107 }
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108
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28
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109 /* ngx_unlock_mutex(pc->peers->mutex); */
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0
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110
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92
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111 return NGX_BUSY;
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0
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112 }
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113 }
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114 }
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115
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116 /* ngx_unlock_mutex(pc->peers->mutex); */
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117
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118
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28
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119 s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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0
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120
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58
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121 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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122 "socket %d", s);
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123
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0
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124 if (s == -1) {
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125 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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126 ngx_socket_n " failed");
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127 return NGX_ERROR;
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128 }
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129
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130
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92
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131 c = ngx_get_connection(s, pc->log);
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0
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132
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92
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133 if (c == NULL) {
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0
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134 if (ngx_close_socket(s) == -1) {
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135 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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136 ngx_close_socket_n "failed");
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137 }
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138
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139 return NGX_ERROR;
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140 }
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141
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142 if (pc->rcvbuf) {
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143 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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144 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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145 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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146 "setsockopt(SO_RCVBUF) failed");
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147
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92
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148 ngx_free_connection(c);
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149
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0
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150 if (ngx_close_socket(s) == -1) {
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151 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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152 ngx_close_socket_n " failed");
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153 }
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154
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155 return NGX_ERROR;
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156 }
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157 }
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158
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159 if (ngx_nonblocking(s) == -1) {
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160 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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161 ngx_nonblocking_n " failed");
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162
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92
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163 ngx_free_connection(c);
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164
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0
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165 if (ngx_close_socket(s) == -1) {
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166 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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167 ngx_close_socket_n " failed");
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168 }
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169
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170 return NGX_ERROR;
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171 }
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172
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92
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173 c->recv = ngx_recv;
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174 c->send = ngx_send;
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175 c->send_chain = ngx_send_chain;
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32
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176
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92
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177 c->log_error = pc->log_error;
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0
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178
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92
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179 if (peer->sockaddr->sa_family != AF_INET) {
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180 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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181 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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0
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182 }
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183
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110
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184 rev = c->read;
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185 wev = c->write;
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0
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186
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187 rev->log = pc->log;
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188 wev->log = pc->log;
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189
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190 pc->connection = c;
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191
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192 /*
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193 * TODO: MT: - ngx_atomic_fetch_add()
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194 * or protection by critical section or mutex
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195 *
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196 * TODO: MP: - allocated in a shared memory
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110
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197 * - ngx_atomic_fetch_add()
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0
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198 * or protection by critical section or mutex
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199 */
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200
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110
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201 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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202
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203 #if (NGX_THREADS)
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204 rev->lock = pc->lock;
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205 wev->lock = pc->lock;
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206 rev->own_lock = &c->lock;
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207 wev->own_lock = &c->lock;
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208 #endif
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209
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210 if (ngx_add_conn) {
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211 if (ngx_add_conn(c) == NGX_ERROR) {
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212 return NGX_ERROR;
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213 }
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214 }
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215
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216 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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217 "connect to %V, fd:%d #%d", &peer->name, s, c->number);
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0
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218
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219 rc = connect(s, peer->sockaddr, peer->socklen);
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0
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220
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221 if (rc == -1) {
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222 err = ngx_socket_errno;
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223
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224 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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225
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226 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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227
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90
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228 if (err == NGX_ECONNREFUSED || err == NGX_EHOSTUNREACH) {
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229 level = NGX_LOG_ERR;
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230 } else {
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231 level = NGX_LOG_CRIT;
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232 }
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36
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233
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90
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234 ngx_log_error(level, c->log, err, "connect() to %V failed",
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235 &peer->name);
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0
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236
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237 return NGX_DECLINED;
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0
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238 }
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239 }
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240
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241 if (ngx_add_conn) {
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242 if (rc == -1) {
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243
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0
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244 /* NGX_EINPROGRESS */
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245
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246 return NGX_AGAIN;
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247 }
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248
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249 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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250
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251 wev->ready = 1;
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252
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0
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253 return NGX_OK;
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254 }
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255
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256 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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257
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4
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258 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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259 "connect(): %d", rc);
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260
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0
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261 /* aio, iocp */
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262
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263 if (ngx_blocking(s) == -1) {
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264 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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265 ngx_blocking_n " failed");
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266 return NGX_ERROR;
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267 }
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268
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269 /*
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36
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270 * FreeBSD's aio allows to post an operation on non-connected socket.
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0
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271 * NT does not support it.
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272 *
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273 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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274 */
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275
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276 rev->ready = 1;
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277 wev->ready = 1;
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278
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279 return NGX_OK;
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280 }
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281
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282 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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283
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284 /* kqueue */
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285
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0
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286 event = NGX_CLEAR_EVENT;
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287
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288 } else {
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289
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290 /* select, poll, /dev/poll */
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291
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292 event = NGX_LEVEL_EVENT;
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293 }
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294
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295 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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296 return NGX_ERROR;
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297 }
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298
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299 if (rc == -1) {
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300
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301 /* NGX_EINPROGRESS */
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302
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303 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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304 return NGX_ERROR;
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305 }
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306
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307 return NGX_AGAIN;
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308 }
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309
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310 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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311
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312 wev->ready = 1;
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313
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314 return NGX_OK;
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315 }
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316
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317
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36
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318 void
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74
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319 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down)
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0
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320 {
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321 time_t now;
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322
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74
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323 if (down) {
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324 now = ngx_time();
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0
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325
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74
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326 /* ngx_lock_mutex(pc->peers->mutex); */
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0
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327
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74
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328 pc->peers->peer[pc->cur_peer].fails++;
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329 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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330
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74
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331 /* ngx_unlock_mutex(pc->peers->mutex); */
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332 }
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0
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333
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334 pc->cur_peer++;
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335
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336 if (pc->cur_peer >= pc->peers->number) {
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337 pc->cur_peer = 0;
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338 }
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339
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94
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340 if (pc->tries) {
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341 pc->tries--;
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342 }
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0
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343 }
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