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