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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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324
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12 static ngx_uint_t
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13 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers);
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14
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15
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260
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16 ngx_int_t
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17 ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
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18 ngx_http_upstream_srv_conf_t *us)
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19 {
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20 ngx_url_t u;
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21 ngx_uint_t i, j, n;
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22 ngx_http_upstream_server_t *server;
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23 ngx_http_upstream_rr_peers_t *peers;
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24
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25 us->peer.init = ngx_http_upstream_init_round_robin_peer;
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26
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27 if (us->servers) {
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28 n = 0;
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29 server = us->servers->elts;
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30
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31 for (i = 0; i < us->servers->nelts; i++) {
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32 n += server[i].naddrs;
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33 }
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34
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35 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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36 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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37 if (peers == NULL) {
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38 return NGX_ERROR;
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39 }
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40
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41 peers->number = n;
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42 peers->name = &us->host;
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43
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44 n = 0;
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45
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46 for (i = 0; i < us->servers->nelts; i++) {
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47 for (j = 0; j < server[i].naddrs; j++) {
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48 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
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49 peers->peer[n].socklen = server[i].addrs[j].socklen;
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50 peers->peer[n].name = server[i].addrs[j].name;
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51 peers->peer[n].weight = server[i].weight;
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52 peers->peer[n].current_weight = server[i].weight;
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53 peers->peer[n].max_fails = server[i].max_fails;
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54 peers->peer[n].fail_timeout = server[i].fail_timeout;
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55 peers->peer[n].down = server[i].down;
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56 n++;
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57 }
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58 }
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59
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60 us->peer.data = peers;
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61
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62 return NGX_OK;
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63 }
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64
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65
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66 /* an upstream implicitly defined by proxy_pass, etc. */
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67
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266
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68 if (us->port == 0 && us->default_port == 0) {
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69 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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70 "no port in upstream \"%V\" in %s:%ui",
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71 &us->host, us->file_name.data, us->line);
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72 return NGX_ERROR;
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73 }
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74
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260
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75 ngx_memzero(&u, sizeof(ngx_url_t));
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76
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77 u.host = us->host;
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266
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78 u.port = (in_port_t) (us->port ? us->port : us->default_port);
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260
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79
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80 if (ngx_inet_resolve_host(cf, &u) != NGX_OK) {
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81 if (u.err) {
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82 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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262
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83 "%s in upstream \"%V\" in %s:%ui",
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260
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84 u.err, &us->host, us->file_name.data, us->line);
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85 }
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86
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87 return NGX_ERROR;
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88 }
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89
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90 n = u.naddrs;
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91
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92 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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93 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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94 if (peers == NULL) {
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95 return NGX_ERROR;
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96 }
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97
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98 peers->number = n;
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99 peers->name = &us->host;
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100
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101 n = 0;
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102
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103 for (i = 0; i < u.naddrs; i++) {
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104 peers->peer[n].sockaddr = u.addrs[i].sockaddr;
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105 peers->peer[n].socklen = u.addrs[i].socklen;
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106 peers->peer[n].name = u.addrs[i].name;
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107 peers->peer[n].weight = 1;
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108 peers->peer[n].current_weight = 1;
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109 peers->peer[n].max_fails = 1;
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110 peers->peer[n].fail_timeout = 10;
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111 n++;
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112 }
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113
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114 us->peer.data = peers;
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115
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116 return NGX_OK;
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117 }
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118
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119
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120 ngx_int_t
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121 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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122 ngx_http_upstream_srv_conf_t *us)
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123 {
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124 ngx_uint_t n;
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125 ngx_http_upstream_rr_peer_data_t *rrp;
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126
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127 rrp = r->upstream->peer.data;
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128
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129 if (rrp == NULL) {
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130 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
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131 if (rrp == NULL) {
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132 return NGX_ERROR;
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133 }
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134
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135 r->upstream->peer.data = rrp;
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136 }
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137
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138 rrp->peers = us->peer.data;
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139 rrp->current = 0;
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140
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141 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
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142 rrp->tried = &rrp->data;
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143 rrp->data = 0;
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144
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145 } else {
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146 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
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147 / (8 * sizeof(uintptr_t));
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148
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149 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
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150 if (rrp->tried == NULL) {
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151 return NGX_ERROR;
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152 }
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153 }
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154
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155 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
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156 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
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157 r->upstream->peer.tries = rrp->peers->number;
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158 #if (NGX_HTTP_SSL)
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318
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159 r->upstream->peer.set_session =
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160 ngx_http_upstream_set_round_robin_peer_session;
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161 r->upstream->peer.save_session =
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162 ngx_http_upstream_save_round_robin_peer_session;
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260
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163 #endif
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164
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165 return NGX_OK;
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166 }
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167
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168
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169 ngx_int_t
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170 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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171 {
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172 ngx_http_upstream_rr_peer_data_t *rrp = data;
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173
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174 time_t now;
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175 uintptr_t m;
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176 ngx_uint_t i, n;
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177 ngx_connection_t *c;
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178 ngx_http_upstream_rr_peer_t *peer;
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179
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180 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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181 "get rr peer, try: %ui", pc->tries);
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182
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183 now = ngx_time();
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184
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185 /* ngx_lock_mutex(rrp->peers->mutex); */
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186
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187 if (rrp->peers->last_cached) {
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188
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189 /* cached connection */
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190
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191 c = rrp->peers->cached[rrp->peers->last_cached];
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192 rrp->peers->last_cached--;
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193
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194 /* ngx_unlock_mutex(ppr->peers->mutex); */
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195
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196 #if (NGX_THREADS)
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197 c->read->lock = c->read->own_lock;
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198 c->write->lock = c->write->own_lock;
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199 #endif
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200
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201 pc->connection = c;
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202 pc->cached = 1;
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203
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204 return NGX_OK;
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205 }
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206
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207 pc->cached = 0;
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208 pc->connection = NULL;
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209
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210 if (rrp->peers->number == 1) {
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211 peer = &rrp->peers->peer[0];
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212
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213 } else {
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214
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215 /* there are several peers */
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216
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217 if (pc->tries == rrp->peers->number) {
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218
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219 /* it's a first try - get a current peer */
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220
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221 for ( ;; ) {
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324
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222 rrp->current = ngx_http_upstream_get_peer(rrp->peers);
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223
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224 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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225 "get rr peer, current: %ui %i",
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226 rrp->current,
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227 rrp->peers->peer[rrp->current].current_weight);
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260
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228
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229 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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230 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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231
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232 if (!(rrp->tried[n] & m)) {
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233 peer = &rrp->peers->peer[rrp->current];
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234
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235 if (!peer->down) {
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236
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237 if (peer->max_fails == 0
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238 || peer->fails < peer->max_fails)
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239 {
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240 break;
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241 }
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242
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243 if (now - peer->accessed > peer->fail_timeout) {
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244 peer->fails = 0;
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245 break;
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246 }
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247
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324
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248 peer->current_weight = 0;
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249
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260
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250 } else {
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251 rrp->tried[n] |= m;
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252 }
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253
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254 pc->tries--;
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255 }
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256
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257 if (pc->tries) {
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258 continue;
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259 }
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260
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261 goto failed;
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262 }
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263
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264 peer->current_weight--;
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265
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266 } else {
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267 for ( ;; ) {
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268 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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269 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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270
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271 if (!(rrp->tried[n] & m)) {
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272
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273 peer = &rrp->peers->peer[rrp->current];
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274
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275 if (!peer->down) {
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276
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277 if (peer->max_fails == 0
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278 || peer->fails < peer->max_fails)
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279 {
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280 break;
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281 }
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282
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283 if (now - peer->accessed > peer->fail_timeout) {
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284 peer->fails = 0;
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285 break;
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286 }
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287
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324
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288 peer->current_weight = 0;
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289
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260
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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
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313 rrp->tried[n] |= m;
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314 }
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315
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316 pc->sockaddr = peer->sockaddr;
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317 pc->socklen = peer->socklen;
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318 pc->name = &peer->name;
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319
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320 /* ngx_unlock_mutex(rrp->peers->mutex); */
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321
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322 return NGX_OK;
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323
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324 failed:
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325
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326 /* all peers failed, mark them as live for quick recovery */
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327
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328 for (i = 0; i < rrp->peers->number; i++) {
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329 rrp->peers->peer[i].fails = 0;
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330 }
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331
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332 /* ngx_unlock_mutex(rrp->peers->mutex); */
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333
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334 pc->name = rrp->peers->name;
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335
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336 return NGX_BUSY;
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337 }
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338
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339
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324
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340 static ngx_uint_t
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341 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers)
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342 {
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343 ngx_uint_t i, n;
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344 ngx_http_upstream_rr_peer_t *peer;
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345
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346 peer = &peers->peer[0];
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347
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348 for ( ;; ) {
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349
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350 for (i = 0; i < peers->number; i++) {
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351
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352 if (peer[i].current_weight <= 0) {
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353 continue;
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354 }
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355
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356 n = i;
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357
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358 while (i < peers->number - 1) {
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359
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360 i++;
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361
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362 if (peer[i].current_weight <= 0) {
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363 continue;
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364 }
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365
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366 if (peer[n].current_weight * 1000 / peer[i].current_weight
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367 >= peer[n].weight * 1000 / peer[i].weight)
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368 {
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369 return n;
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370 }
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371
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372 n = i;
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373 }
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374
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375 if (peer[i].current_weight > 0) {
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376 n = i;
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377 }
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378
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379 return n;
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380 }
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381
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382 for (i = 0; i < peers->number; i++) {
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383 if (peer[i].fails == 0) {
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384 peer[i].current_weight += peer[i].weight;
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385
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386 } else {
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387 /* 1 allows to go to quick recovery when all peers failed */
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388 peer[i].current_weight = 1;
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389 }
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390 }
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391 }
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392 }
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393
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394
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260
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395 void
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396 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
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397 ngx_uint_t state)
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398 {
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399 ngx_http_upstream_rr_peer_data_t *rrp = data;
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400
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401 time_t now;
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402 ngx_http_upstream_rr_peer_t *peer;
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403
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404 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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405 "free rr peer %ui %ui", pc->tries, state);
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406
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407 if (state == 0 && pc->tries == 0) {
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408 return;
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409 }
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410
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411 /* TODO: NGX_PEER_KEEPALIVE */
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412
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413 if (rrp->peers->number == 1) {
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414 pc->tries = 0;
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415 return;
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416 }
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417
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418 if (state & NGX_PEER_FAILED) {
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419 now = ngx_time();
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420
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421 peer = &rrp->peers->peer[rrp->current];
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422
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423 /* ngx_lock_mutex(rrp->peers->mutex); */
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424
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425 peer->fails++;
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426 peer->accessed = now;
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427
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324
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428 peer->current_weight -= peer->weight / peer->max_fails;
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429
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430 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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431 "free rr peer failed: %ui %i",
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432 rrp->current, peer->current_weight);
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433
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434 if (peer->current_weight < 0) {
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435 peer->current_weight = 0;
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260
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436 }
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437
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|
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438 /* ngx_unlock_mutex(rrp->peers->mutex); */
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439 }
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440
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|
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441 rrp->current++;
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442
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|
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443 if (rrp->current >= rrp->peers->number) {
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444 rrp->current = 0;
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445 }
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446
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|
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447 if (pc->tries) {
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|
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448 pc->tries--;
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|
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449 }
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450
|
|
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451 /* ngx_unlock_mutex(rrp->peers->mutex); */
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|
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452 }
|
|
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453
|
|
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454
|
|
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455 #if (NGX_HTTP_SSL)
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|
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456
|
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318
|
457 ngx_int_t
|
|
|
458 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
459 void *data)
|
|
260
|
460 {
|
|
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461 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
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462
|
|
318
|
463 ngx_int_t rc;
|
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260
|
464 ngx_ssl_session_t *ssl_session;
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|
|
465 ngx_http_upstream_rr_peer_t *peer;
|
|
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466
|
|
318
|
467 peer = &rrp->peers->peer[rrp->current];
|
|
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468
|
|
|
469 /* TODO: threads only mutex */
|
|
|
470 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
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471
|
|
|
472 ssl_session = peer->ssl_session;
|
|
|
473
|
|
|
474 rc = ngx_ssl_set_session(pc->connection, ssl_session);
|
|
|
475
|
|
|
476 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
477 "set session: %p:%d",
|
|
|
478 ssl_session, ssl_session ? ssl_session->references : 0);
|
|
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479
|
|
|
480 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
481
|
|
|
482 return rc;
|
|
|
483 }
|
|
|
484
|
|
|
485
|
|
|
486 void
|
|
|
487 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
488 void *data)
|
|
|
489 {
|
|
|
490 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
491
|
|
|
492 ngx_ssl_session_t *old_ssl_session, *ssl_session;
|
|
|
493 ngx_http_upstream_rr_peer_t *peer;
|
|
|
494
|
|
260
|
495 ssl_session = ngx_ssl_get_session(pc->connection);
|
|
|
496
|
|
|
497 if (ssl_session == NULL) {
|
|
|
498 return;
|
|
|
499 }
|
|
|
500
|
|
318
|
501 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
502 "save session: %p:%d", ssl_session, ssl_session->references);
|
|
|
503
|
|
260
|
504 peer = &rrp->peers->peer[rrp->current];
|
|
|
505
|
|
318
|
506 /* TODO: threads only mutex */
|
|
260
|
507 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
318
|
508
|
|
|
509 old_ssl_session = peer->ssl_session;
|
|
260
|
510 peer->ssl_session = ssl_session;
|
|
318
|
511
|
|
260
|
512 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
513
|
|
318
|
514 if (old_ssl_session) {
|
|
|
515
|
|
|
516 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
517 "old session: %p:%d",
|
|
|
518 old_ssl_session, old_ssl_session->references);
|
|
|
519
|
|
260
|
520 /* TODO: may block */
|
|
318
|
521
|
|
|
522 ngx_ssl_free_session(old_ssl_session);
|
|
260
|
523 }
|
|
|
524 }
|
|
|
525
|
|
|
526 #endif
|
