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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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17 ngx_uint_t instance, level, i;
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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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28
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84 if (peer->fails <= peer->max_fails) {
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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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92
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142 rev = c->read;
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143 wev = c->write;
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144
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145 ngx_memzero(c, sizeof(ngx_connection_t));
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146
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147 c->read = rev;
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148 c->write = wev;
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149 c->fd = s;
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150 c->log = pc->log;
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0
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151
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152 if (pc->rcvbuf) {
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153 if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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154 (const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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155 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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156 "setsockopt(SO_RCVBUF) failed");
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157
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92
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158 ngx_free_connection(c);
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159
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0
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160 if (ngx_close_socket(s) == -1) {
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161 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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162 ngx_close_socket_n " failed");
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163 }
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164
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165 return NGX_ERROR;
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166 }
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167 }
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168
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169 if (ngx_nonblocking(s) == -1) {
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170 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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171 ngx_nonblocking_n " failed");
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172
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92
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173 ngx_free_connection(c);
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174
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0
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175 if (ngx_close_socket(s) == -1) {
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176 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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177 ngx_close_socket_n " failed");
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178 }
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179
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180 return NGX_ERROR;
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181 }
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182
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92
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183 c->recv = ngx_recv;
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184 c->send = ngx_send;
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185 c->send_chain = ngx_send_chain;
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32
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186
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187 c->log_error = pc->log_error;
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0
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188
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92
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189 if (peer->sockaddr->sa_family != AF_INET) {
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190 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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191 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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0
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192 }
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193
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194 instance = rev->instance;
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195
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196 ngx_memzero(rev, sizeof(ngx_event_t));
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197 ngx_memzero(wev, sizeof(ngx_event_t));
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198
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199 rev->instance = !instance;
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200 wev->instance = !instance;
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201
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202 rev->index = NGX_INVALID_INDEX;
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203 wev->index = NGX_INVALID_INDEX;
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204
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205 rev->data = c;
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206 wev->data = c;
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207
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208 wev->write = 1;
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209
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210 rev->log = pc->log;
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211 wev->log = pc->log;
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212
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213 pc->connection = c;
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214
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215 /*
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216 * TODO: MT: - atomic increment (x86: lock xadd)
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217 * or protection by critical section or mutex
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218 *
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219 * TODO: MP: - allocated in a shared memory
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220 * - atomic increment (x86: lock xadd)
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221 * or protection by critical section or mutex
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222 */
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223
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224 c->number = ngx_atomic_inc(ngx_connection_counter);
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225
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226 #if (NGX_THREADS)
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227 rev->lock = pc->lock;
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228 wev->lock = pc->lock;
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229 rev->own_lock = &c->lock;
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230 wev->own_lock = &c->lock;
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231 #endif
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232
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233 if (ngx_add_conn) {
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234 if (ngx_add_conn(c) == NGX_ERROR) {
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235 return NGX_ERROR;
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236 }
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237 }
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238
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92
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239 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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240 "connect to %V, fd:%d #%d", &peer->name, s, c->number);
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0
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241
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242 rc = connect(s, peer->sockaddr, peer->socklen);
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0
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243
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244 if (rc == -1) {
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245 err = ngx_socket_errno;
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246
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247 /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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248
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249 if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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250
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90
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251 if (err == NGX_ECONNREFUSED || err == NGX_EHOSTUNREACH) {
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252 level = NGX_LOG_ERR;
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253 } else {
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254 level = NGX_LOG_CRIT;
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255 }
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256
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90
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257 ngx_log_error(level, c->log, err, "connect() to %V failed",
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258 &peer->name);
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0
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259
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260 return NGX_DECLINED;
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0
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261 }
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262 }
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263
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264 if (ngx_add_conn) {
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265 if (rc == -1) {
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266
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267 /* NGX_EINPROGRESS */
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268
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269 return NGX_AGAIN;
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270 }
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271
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272 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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273
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274 wev->ready = 1;
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275
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276 return NGX_OK;
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277 }
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278
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279 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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280
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4
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281 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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282 "connect(): %d", rc);
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283
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284 /* aio, iocp */
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285
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286 if (ngx_blocking(s) == -1) {
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287 ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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288 ngx_blocking_n " failed");
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289 return NGX_ERROR;
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290 }
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291
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292 /*
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293 * FreeBSD's aio allows to post an operation on non-connected socket.
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0
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294 * NT does not support it.
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295 *
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296 * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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297 */
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298
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299 rev->ready = 1;
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300 wev->ready = 1;
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301
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302 return NGX_OK;
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303 }
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304
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36
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305 if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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306
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307 /* kqueue */
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308
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0
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309 event = NGX_CLEAR_EVENT;
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310
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311 } else {
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312
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313 /* select, poll, /dev/poll */
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314
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0
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315 event = NGX_LEVEL_EVENT;
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316 }
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317
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318 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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319 return NGX_ERROR;
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320 }
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321
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322 if (rc == -1) {
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323
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324 /* NGX_EINPROGRESS */
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325
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326 if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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327 return NGX_ERROR;
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328 }
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329
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330 return NGX_AGAIN;
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331 }
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332
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333 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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334
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335 wev->ready = 1;
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336
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337 return NGX_OK;
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338 }
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339
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340
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36
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341 void
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74
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342 ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down)
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0
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343 {
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344 time_t now;
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345
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74
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346 if (down) {
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347 now = ngx_time();
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0
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348
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74
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349 /* ngx_lock_mutex(pc->peers->mutex); */
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0
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350
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74
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351 pc->peers->peer[pc->cur_peer].fails++;
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352 pc->peers->peer[pc->cur_peer].accessed = now;
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0
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353
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74
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354 /* ngx_unlock_mutex(pc->peers->mutex); */
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355 }
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0
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356
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357 pc->cur_peer++;
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358
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359 if (pc->cur_peer >= pc->peers->number) {
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360 pc->cur_peer = 0;
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361 }
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362
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363 pc->tries--;
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364 }
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