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260
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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_http.h>
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10
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11
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12 ngx_int_t
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13 ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
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14 ngx_http_upstream_srv_conf_t *us)
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15 {
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16 ngx_url_t u;
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17 ngx_uint_t i, j, n;
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18 ngx_http_upstream_server_t *server;
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19 ngx_http_upstream_rr_peers_t *peers;
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20
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21 us->peer.init = ngx_http_upstream_init_round_robin_peer;
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22
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23 if (us->servers) {
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24 n = 0;
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25 server = us->servers->elts;
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26
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27 for (i = 0; i < us->servers->nelts; i++) {
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28 n += server[i].naddrs;
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29 }
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30
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31 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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32 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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33 if (peers == NULL) {
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34 return NGX_ERROR;
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35 }
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36
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37 peers->number = n;
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38 peers->name = &us->host;
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39
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40 n = 0;
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41
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42 for (i = 0; i < us->servers->nelts; i++) {
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43 for (j = 0; j < server[i].naddrs; j++) {
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44 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
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45 peers->peer[n].socklen = server[i].addrs[j].socklen;
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46 peers->peer[n].name = server[i].addrs[j].name;
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47 peers->peer[n].weight = server[i].weight;
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48 peers->peer[n].current_weight = server[i].weight;
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49 peers->peer[n].max_fails = server[i].max_fails;
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50 peers->peer[n].fail_timeout = server[i].fail_timeout;
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51 peers->peer[n].down = server[i].down;
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52 n++;
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53 }
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54 }
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55
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56 us->peer.data = peers;
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57
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58 return NGX_OK;
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59 }
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60
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61
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62 /* an upstream implicitly defined by proxy_pass, etc. */
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63
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64 ngx_memzero(&u, sizeof(ngx_url_t));
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65
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66 u.host = us->host;
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67 u.portn = us->port;
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68
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69 if (ngx_inet_resolve_host(cf, &u) != NGX_OK) {
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70 if (u.err) {
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71 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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262
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72 "%s in upstream \"%V\" in %s:%ui",
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260
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73 u.err, &us->host, us->file_name.data, us->line);
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74 }
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75
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76 return NGX_ERROR;
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77 }
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78
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262
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79 if (us->port == 0) {
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80 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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81 "no port in upstream \"%V\" in %s:%ui",
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82 &us->host, us->file_name.data, us->line);
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83 return NGX_ERROR;
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84 }
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85
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260
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86 n = u.naddrs;
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87
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88 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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89 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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90 if (peers == NULL) {
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91 return NGX_ERROR;
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92 }
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93
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94 peers->number = n;
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95 peers->name = &us->host;
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96
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97 n = 0;
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98
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99 for (i = 0; i < u.naddrs; i++) {
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100 peers->peer[n].sockaddr = u.addrs[i].sockaddr;
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101 peers->peer[n].socklen = u.addrs[i].socklen;
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102 peers->peer[n].name = u.addrs[i].name;
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103 peers->peer[n].weight = 1;
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104 peers->peer[n].current_weight = 1;
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105 peers->peer[n].max_fails = 1;
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106 peers->peer[n].fail_timeout = 10;
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107 n++;
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108 }
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109
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110 us->peer.data = peers;
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111
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112 return NGX_OK;
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113 }
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114
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115
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116 ngx_int_t
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117 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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118 ngx_http_upstream_srv_conf_t *us)
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119 {
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120 ngx_uint_t n;
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121 ngx_http_upstream_rr_peer_data_t *rrp;
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122
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123 rrp = r->upstream->peer.data;
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124
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125 if (rrp == NULL) {
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126 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
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127 if (rrp == NULL) {
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128 return NGX_ERROR;
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129 }
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130
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131 r->upstream->peer.data = rrp;
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132 }
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133
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134 rrp->peers = us->peer.data;
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135 rrp->current = 0;
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136
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137 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
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138 rrp->tried = &rrp->data;
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139 rrp->data = 0;
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140
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141 } else {
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142 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
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143 / (8 * sizeof(uintptr_t));
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144
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145 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
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146 if (rrp->tried == NULL) {
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147 return NGX_ERROR;
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148 }
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149 }
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150
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151 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
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152 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
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153 r->upstream->peer.tries = rrp->peers->number;
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154 #if (NGX_HTTP_SSL)
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155 r->upstream->peer.save_session = ngx_http_upstream_save_round_robin_peer;
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156 #endif
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157
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158 return NGX_OK;
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159 }
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160
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161
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162 ngx_int_t
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163 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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164 {
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165 ngx_http_upstream_rr_peer_data_t *rrp = data;
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166
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167 time_t now;
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168 uintptr_t m;
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169 ngx_uint_t i, n;
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170 ngx_connection_t *c;
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171 ngx_http_upstream_rr_peer_t *peer;
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172
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173 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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174 "get rr peer, try: %ui", pc->tries);
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175
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176 now = ngx_time();
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177
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178 /* ngx_lock_mutex(rrp->peers->mutex); */
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179
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180 if (rrp->peers->last_cached) {
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181
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182 /* cached connection */
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183
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184 c = rrp->peers->cached[rrp->peers->last_cached];
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185 rrp->peers->last_cached--;
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186
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187 /* ngx_unlock_mutex(ppr->peers->mutex); */
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188
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189 #if (NGX_THREADS)
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190 c->read->lock = c->read->own_lock;
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191 c->write->lock = c->write->own_lock;
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192 #endif
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193
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194 pc->connection = c;
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195 pc->cached = 1;
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196
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197 return NGX_OK;
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198 }
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199
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200 pc->cached = 0;
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201 pc->connection = NULL;
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202
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203 if (rrp->peers->number == 1) {
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204 peer = &rrp->peers->peer[0];
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205
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206 } else {
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207
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208 /* there are several peers */
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209
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210 if (pc->tries == rrp->peers->number) {
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211
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212 /* it's a first try - get a current peer */
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213
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214 for ( ;; ) {
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215 rrp->current = rrp->peers->current;
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216
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217 n = rrp->current / (8 * sizeof(uintptr_t));
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218 m = 1 << rrp->current % (8 * sizeof(uintptr_t));
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219
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220 if (!(rrp->tried[n] & m)) {
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221 peer = &rrp->peers->peer[rrp->current];
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222
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223 if (!peer->down) {
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224
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225 if (peer->max_fails == 0
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226 || peer->fails < peer->max_fails)
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227 {
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228 break;
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229 }
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230
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231 if (now - peer->accessed > peer->fail_timeout) {
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232 peer->fails = 0;
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233 break;
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234 }
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235
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236 } else {
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237 rrp->tried[n] |= m;
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238 }
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239
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240 pc->tries--;
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241 }
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242
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243 rrp->peers->current++;
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244
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245 if (rrp->peers->current >= rrp->peers->number) {
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246 rrp->peers->current = 0;
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247 }
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248
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249 if (pc->tries) {
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250 continue;
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251 }
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252
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253 goto failed;
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254 }
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255
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256 peer->current_weight--;
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257
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258 if (peer->current_weight == 0) {
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259 peer->current_weight = peer->weight;
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260
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261 rrp->peers->current++;
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262
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263 if (rrp->peers->current >= rrp->peers->number) {
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264 rrp->peers->current = 0;
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265 }
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266 }
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267
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268 } else {
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269 for ( ;; ) {
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270 n = rrp->current / (8 * sizeof(uintptr_t));
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271 m = 1 << rrp->current % (8 * sizeof(uintptr_t));
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272
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273 if (!(rrp->tried[n] & m)) {
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274
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275 peer = &rrp->peers->peer[rrp->current];
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276
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277 if (!peer->down) {
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278
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279 if (peer->max_fails == 0
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280 || peer->fails < peer->max_fails)
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281 {
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282 break;
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283 }
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284
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285 if (now - peer->accessed > peer->fail_timeout) {
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286 peer->fails = 0;
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287 break;
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288 }
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289
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290 } else {
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291 rrp->tried[n] |= m;
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292 }
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293
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294 pc->tries--;
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295 }
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296
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297 rrp->current++;
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298
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299 if (rrp->current >= rrp->peers->number) {
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300 rrp->current = 0;
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301 }
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302
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303 if (pc->tries) {
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304 continue;
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305 }
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306
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307 goto failed;
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308 }
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309
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310 peer->current_weight--;
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311
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312 if (peer->current_weight == 0) {
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313 peer->current_weight = peer->weight;
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314
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315 if (rrp->current == rrp->peers->current) {
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316 rrp->peers->current++;
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317
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318 if (rrp->peers->current >= rrp->peers->number) {
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319 rrp->peers->current = 0;
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320 }
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321 }
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322 }
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323 }
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324
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325 rrp->tried[n] |= m;
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326 }
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327
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328 pc->sockaddr = peer->sockaddr;
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329 pc->socklen = peer->socklen;
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330 pc->name = &peer->name;
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331 #if (NGX_SSL)
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332 pc->ssl_session = peer->ssl_session;
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333 #endif
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334
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335 /* ngx_unlock_mutex(rrp->peers->mutex); */
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336
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337 return NGX_OK;
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338
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339 failed:
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340
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341 /* all peers failed, mark them as live for quick recovery */
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342
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343 for (i = 0; i < rrp->peers->number; i++) {
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344 rrp->peers->peer[i].fails = 0;
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345 }
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346
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347 /* ngx_unlock_mutex(rrp->peers->mutex); */
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348
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349 pc->name = rrp->peers->name;
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350
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351 return NGX_BUSY;
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352 }
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353
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354
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355 void
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356 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
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357 ngx_uint_t state)
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358 {
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359 ngx_http_upstream_rr_peer_data_t *rrp = data;
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360
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361 time_t now;
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362 ngx_http_upstream_rr_peer_t *peer;
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363
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364 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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365 "free rr peer %ui %ui", pc->tries, state);
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366
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367 if (state == 0 && pc->tries == 0) {
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368 return;
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369 }
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370
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371 /* TODO: NGX_PEER_KEEPALIVE */
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372
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373 if (rrp->peers->number == 1) {
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374 pc->tries = 0;
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375 return;
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376 }
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377
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378 if (state & NGX_PEER_FAILED) {
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379 now = ngx_time();
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380
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381 peer = &rrp->peers->peer[rrp->current];
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382
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383 /* ngx_lock_mutex(rrp->peers->mutex); */
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384
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385 peer->fails++;
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386 peer->accessed = now;
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387
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388 if (peer->current_weight > 1) {
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389 peer->current_weight /= 2;
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390 }
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391
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392 /* ngx_unlock_mutex(rrp->peers->mutex); */
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393 }
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394
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395 rrp->current++;
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396
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397 if (rrp->current >= rrp->peers->number) {
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398 rrp->current = 0;
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399 }
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400
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401 if (pc->tries) {
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402 pc->tries--;
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403 }
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404
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405 /* ngx_unlock_mutex(rrp->peers->mutex); */
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406 }
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407
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408
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409 #if (NGX_HTTP_SSL)
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410
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411 void
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412 ngx_http_upstream_save_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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413 {
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414 ngx_http_upstream_rr_peer_data_t *rrp = data;
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415
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416 ngx_ssl_session_t *ssl_session;
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417 ngx_http_upstream_rr_peer_t *peer;
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418
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419 ssl_session = ngx_ssl_get_session(pc->connection);
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420
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421 if (ssl_session == NULL) {
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422 return;
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423 }
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424
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425 peer = &rrp->peers->peer[rrp->current];
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426
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427 /* ngx_lock_mutex(rrp->peers->mutex); */
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428 peer->ssl_session = ssl_session;
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429 /* ngx_unlock_mutex(rrp->peers->mutex); */
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430
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431 if (pc->ssl_session) {
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432 /* TODO: may block */
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433 ngx_ssl_free_session(pc->ssl_session);
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434 }
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435 }
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436
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437 #endif
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