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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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326
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12 static int ngx_http_upstream_cmp_servers(const void *one, const void *two);
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324
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13 static ngx_uint_t
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14 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers);
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15
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16
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260
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17 ngx_int_t
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18 ngx_http_upstream_init_round_robin(ngx_conf_t *cf,
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19 ngx_http_upstream_srv_conf_t *us)
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20 {
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21 ngx_url_t u;
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22 ngx_uint_t i, j, n;
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23 ngx_http_upstream_server_t *server;
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326
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24 ngx_http_upstream_rr_peers_t *peers, *backup;
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260
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25
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26 us->peer.init = ngx_http_upstream_init_round_robin_peer;
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27
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28 if (us->servers) {
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29 server = us->servers->elts;
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30
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326
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31 n = 0;
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32
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260
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33 for (i = 0; i < us->servers->nelts; i++) {
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326
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34 if (server[i].backup) {
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35 continue;
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36 }
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37
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260
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38 n += server[i].naddrs;
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39 }
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40
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41 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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42 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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43 if (peers == NULL) {
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44 return NGX_ERROR;
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45 }
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46
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326
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47 peers->single = (n == 1);
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260
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48 peers->number = n;
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49 peers->name = &us->host;
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50
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51 n = 0;
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52
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53 for (i = 0; i < us->servers->nelts; i++) {
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54 for (j = 0; j < server[i].naddrs; j++) {
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326
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55 if (server[i].backup) {
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56 continue;
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57 }
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58
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260
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59 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr;
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60 peers->peer[n].socklen = server[i].addrs[j].socklen;
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61 peers->peer[n].name = server[i].addrs[j].name;
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62 peers->peer[n].max_fails = server[i].max_fails;
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63 peers->peer[n].fail_timeout = server[i].fail_timeout;
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64 peers->peer[n].down = server[i].down;
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326
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65 peers->peer[n].weight = server[i].down ? 0 : server[i].weight;
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66 peers->peer[n].current_weight = peers->peer[n].weight;
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260
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67 n++;
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68 }
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69 }
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70
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71 us->peer.data = peers;
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72
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326
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73 ngx_sort(&peers->peer[0], (size_t) n,
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74 sizeof(ngx_http_upstream_rr_peer_t),
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75 ngx_http_upstream_cmp_servers);
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76
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77 /* backup servers */
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78
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79 n = 0;
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80
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81 for (i = 0; i < us->servers->nelts; i++) {
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82 if (!server[i].backup) {
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83 continue;
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84 }
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85
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86 n += server[i].naddrs;
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87 }
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88
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89 if (n == 0) {
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90 return NGX_OK;
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91 }
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92
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93 backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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94 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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95 if (backup == NULL) {
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96 return NGX_ERROR;
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97 }
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98
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99 peers->single = 0;
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100 backup->single = 0;
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101 backup->number = n;
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102 backup->name = &us->host;
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103
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104 n = 0;
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105
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106 for (i = 0; i < us->servers->nelts; i++) {
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107 for (j = 0; j < server[i].naddrs; j++) {
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108 if (!server[i].backup) {
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109 continue;
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110 }
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111
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112 backup->peer[n].sockaddr = server[i].addrs[j].sockaddr;
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113 backup->peer[n].socklen = server[i].addrs[j].socklen;
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114 backup->peer[n].name = server[i].addrs[j].name;
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115 backup->peer[n].weight = server[i].weight;
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116 backup->peer[n].current_weight = server[i].weight;
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117 backup->peer[n].max_fails = server[i].max_fails;
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118 backup->peer[n].fail_timeout = server[i].fail_timeout;
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119 backup->peer[n].down = server[i].down;
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120 n++;
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121 }
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122 }
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123
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124 peers->next = backup;
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125
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126 ngx_sort(&backup->peer[0], (size_t) n,
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127 sizeof(ngx_http_upstream_rr_peer_t),
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128 ngx_http_upstream_cmp_servers);
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129
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260
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130 return NGX_OK;
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131 }
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132
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133
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134 /* an upstream implicitly defined by proxy_pass, etc. */
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135
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266
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136 if (us->port == 0 && us->default_port == 0) {
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137 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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138 "no port in upstream \"%V\" in %s:%ui",
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139 &us->host, us->file_name.data, us->line);
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140 return NGX_ERROR;
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141 }
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142
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260
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143 ngx_memzero(&u, sizeof(ngx_url_t));
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144
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145 u.host = us->host;
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266
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146 u.port = (in_port_t) (us->port ? us->port : us->default_port);
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260
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147
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148 if (ngx_inet_resolve_host(cf, &u) != NGX_OK) {
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149 if (u.err) {
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150 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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262
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151 "%s in upstream \"%V\" in %s:%ui",
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260
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152 u.err, &us->host, us->file_name.data, us->line);
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153 }
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154
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155 return NGX_ERROR;
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156 }
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157
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158 n = u.naddrs;
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159
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160 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t)
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161 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1));
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162 if (peers == NULL) {
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163 return NGX_ERROR;
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164 }
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165
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326
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166 peers->single = (n == 1);
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260
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167 peers->number = n;
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168 peers->name = &us->host;
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169
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170 n = 0;
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171
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172 for (i = 0; i < u.naddrs; i++) {
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173 peers->peer[n].sockaddr = u.addrs[i].sockaddr;
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174 peers->peer[n].socklen = u.addrs[i].socklen;
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175 peers->peer[n].name = u.addrs[i].name;
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176 peers->peer[n].weight = 1;
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177 peers->peer[n].current_weight = 1;
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178 peers->peer[n].max_fails = 1;
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179 peers->peer[n].fail_timeout = 10;
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180 n++;
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181 }
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182
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183 us->peer.data = peers;
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184
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326
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185 /* implicitly defined upstream has no backup servers */
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186
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260
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187 return NGX_OK;
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188 }
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189
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190
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326
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191 static int
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192 ngx_http_upstream_cmp_servers(const void *one, const void *two)
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193 {
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194 ngx_http_upstream_rr_peer_t *first, *second;
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195
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196 first = (ngx_http_upstream_rr_peer_t *) one;
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197 second = (ngx_http_upstream_rr_peer_t *) two;
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198
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199 return (first->weight < second->weight);
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200 }
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201
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202
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260
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203 ngx_int_t
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204 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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205 ngx_http_upstream_srv_conf_t *us)
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206 {
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207 ngx_uint_t n;
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208 ngx_http_upstream_rr_peer_data_t *rrp;
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209
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210 rrp = r->upstream->peer.data;
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211
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212 if (rrp == NULL) {
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213 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
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214 if (rrp == NULL) {
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215 return NGX_ERROR;
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216 }
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217
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218 r->upstream->peer.data = rrp;
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219 }
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220
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221 rrp->peers = us->peer.data;
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222 rrp->current = 0;
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223
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224 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
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225 rrp->tried = &rrp->data;
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226 rrp->data = 0;
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227
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228 } else {
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229 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
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230 / (8 * sizeof(uintptr_t));
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231
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232 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
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233 if (rrp->tried == NULL) {
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234 return NGX_ERROR;
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235 }
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236 }
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237
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238 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
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239 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
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240 r->upstream->peer.tries = rrp->peers->number;
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241 #if (NGX_HTTP_SSL)
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318
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242 r->upstream->peer.set_session =
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243 ngx_http_upstream_set_round_robin_peer_session;
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244 r->upstream->peer.save_session =
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245 ngx_http_upstream_save_round_robin_peer_session;
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260
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246 #endif
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247
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248 return NGX_OK;
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249 }
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250
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251
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252 ngx_int_t
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253 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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254 {
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255 ngx_http_upstream_rr_peer_data_t *rrp = data;
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256
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326
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257 time_t now;
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258 uintptr_t m;
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259 ngx_int_t rc;
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260 ngx_uint_t i, n;
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261 ngx_connection_t *c;
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262 ngx_http_upstream_rr_peer_t *peer;
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263 ngx_http_upstream_rr_peers_t *peers;
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260
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264
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265 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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266 "get rr peer, try: %ui", pc->tries);
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267
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268 now = ngx_time();
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269
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270 /* ngx_lock_mutex(rrp->peers->mutex); */
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271
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272 if (rrp->peers->last_cached) {
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273
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274 /* cached connection */
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275
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276 c = rrp->peers->cached[rrp->peers->last_cached];
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277 rrp->peers->last_cached--;
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278
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279 /* ngx_unlock_mutex(ppr->peers->mutex); */
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280
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281 #if (NGX_THREADS)
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282 c->read->lock = c->read->own_lock;
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283 c->write->lock = c->write->own_lock;
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284 #endif
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285
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286 pc->connection = c;
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287 pc->cached = 1;
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288
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289 return NGX_OK;
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290 }
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291
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292 pc->cached = 0;
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293 pc->connection = NULL;
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294
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326
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295 if (rrp->peers->single) {
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260
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296 peer = &rrp->peers->peer[0];
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297
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298 } else {
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299
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300 /* there are several peers */
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301
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302 if (pc->tries == rrp->peers->number) {
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303
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304 /* it's a first try - get a current peer */
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305
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330
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306 i = pc->tries;
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307
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260
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308 for ( ;; ) {
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324
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309 rrp->current = ngx_http_upstream_get_peer(rrp->peers);
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310
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311 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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312 "get rr peer, current: %ui %i",
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313 rrp->current,
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314 rrp->peers->peer[rrp->current].current_weight);
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260
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315
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316 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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317 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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318
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319 if (!(rrp->tried[n] & m)) {
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320 peer = &rrp->peers->peer[rrp->current];
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321
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322 if (!peer->down) {
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323
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324 if (peer->max_fails == 0
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325 || peer->fails < peer->max_fails)
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326 {
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327 break;
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328 }
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329
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330 if (now - peer->accessed > peer->fail_timeout) {
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331 peer->fails = 0;
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332 break;
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333 }
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334
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324
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335 peer->current_weight = 0;
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336
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260
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337 } else {
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338 rrp->tried[n] |= m;
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339 }
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340
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341 pc->tries--;
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342 }
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343
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330
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344 if (pc->tries == 0) {
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345 goto failed;
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260
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346 }
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347
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330
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348 if (--i == 0) {
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349 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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350 "round robin upstream stuck on %ui tries",
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351 pc->tries);
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352 goto failed;
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353 }
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260
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354 }
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355
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356 peer->current_weight--;
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357
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358 } else {
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330
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359
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360 i = pc->tries;
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361
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260
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362 for ( ;; ) {
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363 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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364 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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365
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366 if (!(rrp->tried[n] & m)) {
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367
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368 peer = &rrp->peers->peer[rrp->current];
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369
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370 if (!peer->down) {
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371
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372 if (peer->max_fails == 0
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373 || peer->fails < peer->max_fails)
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374 {
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375 break;
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376 }
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377
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378 if (now - peer->accessed > peer->fail_timeout) {
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379 peer->fails = 0;
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380 break;
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381 }
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382
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324
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383 peer->current_weight = 0;
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384
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260
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385 } else {
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386 rrp->tried[n] |= m;
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387 }
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388
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389 pc->tries--;
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390 }
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391
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392 rrp->current++;
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393
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394 if (rrp->current >= rrp->peers->number) {
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395 rrp->current = 0;
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396 }
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397
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330
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398 if (pc->tries == 0) {
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399 goto failed;
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260
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400 }
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401
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330
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402 if (--i == 0) {
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403 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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404 "round robin upstream stuck on %ui tries",
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405 pc->tries);
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406 goto failed;
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407 }
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260
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408 }
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409
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410 peer->current_weight--;
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411 }
|
|
|
412
|
|
|
413 rrp->tried[n] |= m;
|
|
|
414 }
|
|
|
415
|
|
|
416 pc->sockaddr = peer->sockaddr;
|
|
|
417 pc->socklen = peer->socklen;
|
|
|
418 pc->name = &peer->name;
|
|
|
419
|
|
|
420 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
421
|
|
326
|
422 if (pc->tries == 1 && rrp->peers->next) {
|
|
|
423 pc->tries += rrp->peers->next->number;
|
|
|
424
|
|
|
425 n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1;
|
|
|
426 for (i = 0; i < n; i++) {
|
|
|
427 rrp->tried[i] = 0;
|
|
|
428 }
|
|
|
429 }
|
|
|
430
|
|
260
|
431 return NGX_OK;
|
|
|
432
|
|
|
433 failed:
|
|
|
434
|
|
326
|
435 peers = rrp->peers;
|
|
|
436
|
|
|
437 if (peers->next) {
|
|
|
438
|
|
|
439 /* ngx_unlock_mutex(peers->mutex); */
|
|
|
440
|
|
|
441 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers");
|
|
|
442
|
|
|
443 rrp->peers = peers->next;
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|
|
444 pc->tries = rrp->peers->number;
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|
|
445
|
|
|
446 n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1;
|
|
|
447 for (i = 0; i < n; i++) {
|
|
|
448 rrp->tried[i] = 0;
|
|
|
449 }
|
|
|
450
|
|
|
451 rc = ngx_http_upstream_get_round_robin_peer(pc, rrp);
|
|
|
452
|
|
|
453 if (rc != NGX_BUSY) {
|
|
|
454 return rc;
|
|
|
455 }
|
|
|
456
|
|
|
457 /* ngx_lock_mutex(peers->mutex); */
|
|
|
458 }
|
|
|
459
|
|
260
|
460 /* all peers failed, mark them as live for quick recovery */
|
|
|
461
|
|
326
|
462 for (i = 0; i < peers->number; i++) {
|
|
|
463 peers->peer[i].fails = 0;
|
|
260
|
464 }
|
|
|
465
|
|
326
|
466 /* ngx_unlock_mutex(peers->mutex); */
|
|
260
|
467
|
|
326
|
468 pc->name = peers->name;
|
|
260
|
469
|
|
|
470 return NGX_BUSY;
|
|
|
471 }
|
|
|
472
|
|
|
473
|
|
324
|
474 static ngx_uint_t
|
|
|
475 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers)
|
|
|
476 {
|
|
|
477 ngx_uint_t i, n;
|
|
|
478 ngx_http_upstream_rr_peer_t *peer;
|
|
|
479
|
|
|
480 peer = &peers->peer[0];
|
|
|
481
|
|
|
482 for ( ;; ) {
|
|
|
483
|
|
|
484 for (i = 0; i < peers->number; i++) {
|
|
|
485
|
|
|
486 if (peer[i].current_weight <= 0) {
|
|
|
487 continue;
|
|
|
488 }
|
|
|
489
|
|
|
490 n = i;
|
|
|
491
|
|
|
492 while (i < peers->number - 1) {
|
|
|
493
|
|
|
494 i++;
|
|
|
495
|
|
|
496 if (peer[i].current_weight <= 0) {
|
|
|
497 continue;
|
|
|
498 }
|
|
|
499
|
|
|
500 if (peer[n].current_weight * 1000 / peer[i].current_weight
|
|
|
501 >= peer[n].weight * 1000 / peer[i].weight)
|
|
|
502 {
|
|
|
503 return n;
|
|
|
504 }
|
|
|
505
|
|
|
506 n = i;
|
|
|
507 }
|
|
|
508
|
|
|
509 if (peer[i].current_weight > 0) {
|
|
|
510 n = i;
|
|
|
511 }
|
|
|
512
|
|
|
513 return n;
|
|
|
514 }
|
|
|
515
|
|
|
516 for (i = 0; i < peers->number; i++) {
|
|
|
517 if (peer[i].fails == 0) {
|
|
330
|
518 peer[i].current_weight = peer[i].weight;
|
|
324
|
519
|
|
|
520 } else {
|
|
|
521 /* 1 allows to go to quick recovery when all peers failed */
|
|
|
522 peer[i].current_weight = 1;
|
|
|
523 }
|
|
|
524 }
|
|
|
525 }
|
|
|
526 }
|
|
|
527
|
|
|
528
|
|
260
|
529 void
|
|
|
530 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
|
|
|
531 ngx_uint_t state)
|
|
|
532 {
|
|
|
533 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
534
|
|
|
535 time_t now;
|
|
|
536 ngx_http_upstream_rr_peer_t *peer;
|
|
|
537
|
|
|
538 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
539 "free rr peer %ui %ui", pc->tries, state);
|
|
|
540
|
|
|
541 if (state == 0 && pc->tries == 0) {
|
|
|
542 return;
|
|
|
543 }
|
|
|
544
|
|
|
545 /* TODO: NGX_PEER_KEEPALIVE */
|
|
|
546
|
|
326
|
547 if (rrp->peers->single) {
|
|
260
|
548 pc->tries = 0;
|
|
|
549 return;
|
|
|
550 }
|
|
|
551
|
|
|
552 if (state & NGX_PEER_FAILED) {
|
|
|
553 now = ngx_time();
|
|
|
554
|
|
|
555 peer = &rrp->peers->peer[rrp->current];
|
|
|
556
|
|
|
557 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
|
558
|
|
|
559 peer->fails++;
|
|
|
560 peer->accessed = now;
|
|
|
561
|
|
324
|
562 peer->current_weight -= peer->weight / peer->max_fails;
|
|
|
563
|
|
|
564 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
565 "free rr peer failed: %ui %i",
|
|
|
566 rrp->current, peer->current_weight);
|
|
|
567
|
|
|
568 if (peer->current_weight < 0) {
|
|
|
569 peer->current_weight = 0;
|
|
260
|
570 }
|
|
|
571
|
|
|
572 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
573 }
|
|
|
574
|
|
|
575 rrp->current++;
|
|
|
576
|
|
|
577 if (rrp->current >= rrp->peers->number) {
|
|
|
578 rrp->current = 0;
|
|
|
579 }
|
|
|
580
|
|
|
581 if (pc->tries) {
|
|
|
582 pc->tries--;
|
|
|
583 }
|
|
|
584
|
|
|
585 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
586 }
|
|
|
587
|
|
|
588
|
|
|
589 #if (NGX_HTTP_SSL)
|
|
|
590
|
|
318
|
591 ngx_int_t
|
|
|
592 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
593 void *data)
|
|
260
|
594 {
|
|
|
595 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
596
|
|
318
|
597 ngx_int_t rc;
|
|
260
|
598 ngx_ssl_session_t *ssl_session;
|
|
|
599 ngx_http_upstream_rr_peer_t *peer;
|
|
|
600
|
|
318
|
601 peer = &rrp->peers->peer[rrp->current];
|
|
|
602
|
|
|
603 /* TODO: threads only mutex */
|
|
|
604 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
|
605
|
|
|
606 ssl_session = peer->ssl_session;
|
|
|
607
|
|
|
608 rc = ngx_ssl_set_session(pc->connection, ssl_session);
|
|
|
609
|
|
|
610 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
611 "set session: %p:%d",
|
|
|
612 ssl_session, ssl_session ? ssl_session->references : 0);
|
|
318
|
613
|
|
|
614 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
615
|
|
|
616 return rc;
|
|
|
617 }
|
|
|
618
|
|
|
619
|
|
|
620 void
|
|
|
621 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
622 void *data)
|
|
|
623 {
|
|
|
624 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
625
|
|
|
626 ngx_ssl_session_t *old_ssl_session, *ssl_session;
|
|
|
627 ngx_http_upstream_rr_peer_t *peer;
|
|
|
628
|
|
260
|
629 ssl_session = ngx_ssl_get_session(pc->connection);
|
|
|
630
|
|
|
631 if (ssl_session == NULL) {
|
|
|
632 return;
|
|
|
633 }
|
|
|
634
|
|
318
|
635 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
636 "save session: %p:%d", ssl_session, ssl_session->references);
|
|
318
|
637
|
|
260
|
638 peer = &rrp->peers->peer[rrp->current];
|
|
|
639
|
|
318
|
640 /* TODO: threads only mutex */
|
|
260
|
641 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
318
|
642
|
|
|
643 old_ssl_session = peer->ssl_session;
|
|
260
|
644 peer->ssl_session = ssl_session;
|
|
318
|
645
|
|
260
|
646 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
647
|
|
318
|
648 if (old_ssl_session) {
|
|
|
649
|
|
|
650 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
651 "old session: %p:%d",
|
|
318
|
652 old_ssl_session, old_ssl_session->references);
|
|
|
653
|
|
260
|
654 /* TODO: may block */
|
|
318
|
655
|
|
|
656 ngx_ssl_free_session(old_ssl_session);
|
|
260
|
657 }
|
|
|
658 }
|
|
|
659
|
|
|
660 #endif
|
