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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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336
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139 &us->host, us->file_name, us->line);
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266
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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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340
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148 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
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260
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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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336
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152 u.err, &us->host, us->file_name, us->line);
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260
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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 for (i = 0; i < u.naddrs; i++) {
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340
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171 peers->peer[i].sockaddr = u.addrs[i].sockaddr;
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172 peers->peer[i].socklen = u.addrs[i].socklen;
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173 peers->peer[i].name = u.addrs[i].name;
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174 peers->peer[i].weight = 1;
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175 peers->peer[i].current_weight = 1;
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176 peers->peer[i].max_fails = 1;
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177 peers->peer[i].fail_timeout = 10;
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260
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178 }
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179
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180 us->peer.data = peers;
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181
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326
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182 /* implicitly defined upstream has no backup servers */
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183
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260
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184 return NGX_OK;
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185 }
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186
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187
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326
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188 static int
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189 ngx_http_upstream_cmp_servers(const void *one, const void *two)
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190 {
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191 ngx_http_upstream_rr_peer_t *first, *second;
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192
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193 first = (ngx_http_upstream_rr_peer_t *) one;
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194 second = (ngx_http_upstream_rr_peer_t *) two;
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195
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196 return (first->weight < second->weight);
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197 }
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198
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199
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260
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200 ngx_int_t
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201 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r,
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202 ngx_http_upstream_srv_conf_t *us)
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203 {
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204 ngx_uint_t n;
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205 ngx_http_upstream_rr_peer_data_t *rrp;
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206
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207 rrp = r->upstream->peer.data;
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208
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209 if (rrp == NULL) {
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210 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t));
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211 if (rrp == NULL) {
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212 return NGX_ERROR;
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213 }
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214
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215 r->upstream->peer.data = rrp;
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216 }
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217
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218 rrp->peers = us->peer.data;
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219 rrp->current = 0;
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220
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221 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) {
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222 rrp->tried = &rrp->data;
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223 rrp->data = 0;
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224
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225 } else {
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226 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1))
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227 / (8 * sizeof(uintptr_t));
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228
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229 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t));
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230 if (rrp->tried == NULL) {
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231 return NGX_ERROR;
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232 }
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233 }
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234
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235 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer;
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236 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer;
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237 r->upstream->peer.tries = rrp->peers->number;
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238 #if (NGX_HTTP_SSL)
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318
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239 r->upstream->peer.set_session =
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240 ngx_http_upstream_set_round_robin_peer_session;
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241 r->upstream->peer.save_session =
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242 ngx_http_upstream_save_round_robin_peer_session;
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260
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243 #endif
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244
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245 return NGX_OK;
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246 }
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247
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248
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249 ngx_int_t
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250 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data)
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251 {
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252 ngx_http_upstream_rr_peer_data_t *rrp = data;
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253
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326
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254 time_t now;
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255 uintptr_t m;
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256 ngx_int_t rc;
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257 ngx_uint_t i, n;
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258 ngx_connection_t *c;
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259 ngx_http_upstream_rr_peer_t *peer;
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260 ngx_http_upstream_rr_peers_t *peers;
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260
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261
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262 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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263 "get rr peer, try: %ui", pc->tries);
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264
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265 now = ngx_time();
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266
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267 /* ngx_lock_mutex(rrp->peers->mutex); */
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268
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269 if (rrp->peers->last_cached) {
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270
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271 /* cached connection */
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272
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273 c = rrp->peers->cached[rrp->peers->last_cached];
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274 rrp->peers->last_cached--;
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275
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276 /* ngx_unlock_mutex(ppr->peers->mutex); */
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277
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278 #if (NGX_THREADS)
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279 c->read->lock = c->read->own_lock;
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280 c->write->lock = c->write->own_lock;
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281 #endif
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282
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283 pc->connection = c;
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284 pc->cached = 1;
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285
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286 return NGX_OK;
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287 }
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288
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289 pc->cached = 0;
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290 pc->connection = NULL;
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291
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326
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292 if (rrp->peers->single) {
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260
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293 peer = &rrp->peers->peer[0];
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294
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295 } else {
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296
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297 /* there are several peers */
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298
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299 if (pc->tries == rrp->peers->number) {
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300
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301 /* it's a first try - get a current peer */
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302
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330
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303 i = pc->tries;
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304
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260
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305 for ( ;; ) {
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324
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306 rrp->current = ngx_http_upstream_get_peer(rrp->peers);
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307
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308 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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309 "get rr peer, current: %ui %i",
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310 rrp->current,
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311 rrp->peers->peer[rrp->current].current_weight);
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260
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312
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313 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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314 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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315
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316 if (!(rrp->tried[n] & m)) {
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317 peer = &rrp->peers->peer[rrp->current];
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318
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319 if (!peer->down) {
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320
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321 if (peer->max_fails == 0
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322 || peer->fails < peer->max_fails)
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323 {
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324 break;
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325 }
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326
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327 if (now - peer->accessed > peer->fail_timeout) {
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328 peer->fails = 0;
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329 break;
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330 }
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331
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324
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332 peer->current_weight = 0;
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333
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260
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334 } else {
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335 rrp->tried[n] |= m;
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336 }
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337
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338 pc->tries--;
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339 }
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340
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330
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341 if (pc->tries == 0) {
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342 goto failed;
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260
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343 }
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344
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330
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345 if (--i == 0) {
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346 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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347 "round robin upstream stuck on %ui tries",
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348 pc->tries);
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349 goto failed;
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350 }
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260
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351 }
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352
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353 peer->current_weight--;
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354
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355 } else {
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330
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356
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357 i = pc->tries;
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358
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260
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359 for ( ;; ) {
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360 n = rrp->current / (8 * sizeof(uintptr_t));
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302
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361 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t));
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260
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362
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363 if (!(rrp->tried[n] & m)) {
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364
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365 peer = &rrp->peers->peer[rrp->current];
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366
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367 if (!peer->down) {
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368
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369 if (peer->max_fails == 0
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370 || peer->fails < peer->max_fails)
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371 {
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372 break;
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373 }
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374
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375 if (now - peer->accessed > peer->fail_timeout) {
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376 peer->fails = 0;
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377 break;
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378 }
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379
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324
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380 peer->current_weight = 0;
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381
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260
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382 } else {
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383 rrp->tried[n] |= m;
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384 }
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385
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386 pc->tries--;
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387 }
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388
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389 rrp->current++;
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390
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391 if (rrp->current >= rrp->peers->number) {
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392 rrp->current = 0;
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393 }
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394
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330
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395 if (pc->tries == 0) {
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396 goto failed;
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260
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397 }
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398
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330
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399 if (--i == 0) {
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400 ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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401 "round robin upstream stuck on %ui tries",
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402 pc->tries);
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403 goto failed;
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404 }
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260
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405 }
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406
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407 peer->current_weight--;
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408 }
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409
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|
410 rrp->tried[n] |= m;
|
|
|
411 }
|
|
|
412
|
|
|
413 pc->sockaddr = peer->sockaddr;
|
|
|
414 pc->socklen = peer->socklen;
|
|
|
415 pc->name = &peer->name;
|
|
|
416
|
|
|
417 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
418
|
|
326
|
419 if (pc->tries == 1 && rrp->peers->next) {
|
|
|
420 pc->tries += rrp->peers->next->number;
|
|
|
421
|
|
|
422 n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1;
|
|
|
423 for (i = 0; i < n; i++) {
|
|
|
424 rrp->tried[i] = 0;
|
|
|
425 }
|
|
|
426 }
|
|
|
427
|
|
260
|
428 return NGX_OK;
|
|
|
429
|
|
|
430 failed:
|
|
|
431
|
|
326
|
432 peers = rrp->peers;
|
|
|
433
|
|
|
434 if (peers->next) {
|
|
|
435
|
|
|
436 /* ngx_unlock_mutex(peers->mutex); */
|
|
|
437
|
|
|
438 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers");
|
|
|
439
|
|
|
440 rrp->peers = peers->next;
|
|
|
441 pc->tries = rrp->peers->number;
|
|
|
442
|
|
|
443 n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1;
|
|
|
444 for (i = 0; i < n; i++) {
|
|
|
445 rrp->tried[i] = 0;
|
|
|
446 }
|
|
|
447
|
|
|
448 rc = ngx_http_upstream_get_round_robin_peer(pc, rrp);
|
|
|
449
|
|
|
450 if (rc != NGX_BUSY) {
|
|
|
451 return rc;
|
|
|
452 }
|
|
|
453
|
|
|
454 /* ngx_lock_mutex(peers->mutex); */
|
|
|
455 }
|
|
|
456
|
|
260
|
457 /* all peers failed, mark them as live for quick recovery */
|
|
|
458
|
|
326
|
459 for (i = 0; i < peers->number; i++) {
|
|
|
460 peers->peer[i].fails = 0;
|
|
260
|
461 }
|
|
|
462
|
|
326
|
463 /* ngx_unlock_mutex(peers->mutex); */
|
|
260
|
464
|
|
326
|
465 pc->name = peers->name;
|
|
260
|
466
|
|
|
467 return NGX_BUSY;
|
|
|
468 }
|
|
|
469
|
|
|
470
|
|
324
|
471 static ngx_uint_t
|
|
|
472 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers)
|
|
|
473 {
|
|
|
474 ngx_uint_t i, n;
|
|
|
475 ngx_http_upstream_rr_peer_t *peer;
|
|
|
476
|
|
|
477 peer = &peers->peer[0];
|
|
|
478
|
|
|
479 for ( ;; ) {
|
|
|
480
|
|
|
481 for (i = 0; i < peers->number; i++) {
|
|
|
482
|
|
|
483 if (peer[i].current_weight <= 0) {
|
|
|
484 continue;
|
|
|
485 }
|
|
|
486
|
|
|
487 n = i;
|
|
|
488
|
|
|
489 while (i < peers->number - 1) {
|
|
|
490
|
|
|
491 i++;
|
|
|
492
|
|
|
493 if (peer[i].current_weight <= 0) {
|
|
|
494 continue;
|
|
|
495 }
|
|
|
496
|
|
|
497 if (peer[n].current_weight * 1000 / peer[i].current_weight
|
|
336
|
498 > peer[n].weight * 1000 / peer[i].weight)
|
|
324
|
499 {
|
|
|
500 return n;
|
|
|
501 }
|
|
|
502
|
|
|
503 n = i;
|
|
|
504 }
|
|
|
505
|
|
|
506 if (peer[i].current_weight > 0) {
|
|
|
507 n = i;
|
|
|
508 }
|
|
|
509
|
|
|
510 return n;
|
|
|
511 }
|
|
|
512
|
|
|
513 for (i = 0; i < peers->number; i++) {
|
|
340
|
514 peer[i].current_weight += peer[i].weight;
|
|
324
|
515 }
|
|
|
516 }
|
|
|
517 }
|
|
|
518
|
|
|
519
|
|
260
|
520 void
|
|
|
521 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data,
|
|
|
522 ngx_uint_t state)
|
|
|
523 {
|
|
|
524 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
525
|
|
|
526 time_t now;
|
|
|
527 ngx_http_upstream_rr_peer_t *peer;
|
|
|
528
|
|
|
529 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
530 "free rr peer %ui %ui", pc->tries, state);
|
|
|
531
|
|
|
532 if (state == 0 && pc->tries == 0) {
|
|
|
533 return;
|
|
|
534 }
|
|
|
535
|
|
|
536 /* TODO: NGX_PEER_KEEPALIVE */
|
|
|
537
|
|
326
|
538 if (rrp->peers->single) {
|
|
260
|
539 pc->tries = 0;
|
|
|
540 return;
|
|
|
541 }
|
|
|
542
|
|
|
543 if (state & NGX_PEER_FAILED) {
|
|
|
544 now = ngx_time();
|
|
|
545
|
|
|
546 peer = &rrp->peers->peer[rrp->current];
|
|
|
547
|
|
|
548 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
|
549
|
|
|
550 peer->fails++;
|
|
|
551 peer->accessed = now;
|
|
|
552
|
|
324
|
553 peer->current_weight -= peer->weight / peer->max_fails;
|
|
|
554
|
|
|
555 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
|
556 "free rr peer failed: %ui %i",
|
|
|
557 rrp->current, peer->current_weight);
|
|
|
558
|
|
|
559 if (peer->current_weight < 0) {
|
|
|
560 peer->current_weight = 0;
|
|
260
|
561 }
|
|
|
562
|
|
|
563 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
564 }
|
|
|
565
|
|
|
566 rrp->current++;
|
|
|
567
|
|
|
568 if (rrp->current >= rrp->peers->number) {
|
|
|
569 rrp->current = 0;
|
|
|
570 }
|
|
|
571
|
|
|
572 if (pc->tries) {
|
|
|
573 pc->tries--;
|
|
|
574 }
|
|
|
575
|
|
|
576 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
577 }
|
|
|
578
|
|
|
579
|
|
|
580 #if (NGX_HTTP_SSL)
|
|
|
581
|
|
318
|
582 ngx_int_t
|
|
|
583 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
584 void *data)
|
|
260
|
585 {
|
|
|
586 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
587
|
|
318
|
588 ngx_int_t rc;
|
|
260
|
589 ngx_ssl_session_t *ssl_session;
|
|
|
590 ngx_http_upstream_rr_peer_t *peer;
|
|
|
591
|
|
318
|
592 peer = &rrp->peers->peer[rrp->current];
|
|
|
593
|
|
|
594 /* TODO: threads only mutex */
|
|
|
595 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
|
596
|
|
|
597 ssl_session = peer->ssl_session;
|
|
|
598
|
|
|
599 rc = ngx_ssl_set_session(pc->connection, ssl_session);
|
|
|
600
|
|
|
601 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
602 "set session: %p:%d",
|
|
|
603 ssl_session, ssl_session ? ssl_session->references : 0);
|
|
318
|
604
|
|
|
605 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
606
|
|
|
607 return rc;
|
|
|
608 }
|
|
|
609
|
|
|
610
|
|
|
611 void
|
|
|
612 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc,
|
|
|
613 void *data)
|
|
|
614 {
|
|
|
615 ngx_http_upstream_rr_peer_data_t *rrp = data;
|
|
|
616
|
|
|
617 ngx_ssl_session_t *old_ssl_session, *ssl_session;
|
|
|
618 ngx_http_upstream_rr_peer_t *peer;
|
|
|
619
|
|
260
|
620 ssl_session = ngx_ssl_get_session(pc->connection);
|
|
|
621
|
|
|
622 if (ssl_session == NULL) {
|
|
|
623 return;
|
|
|
624 }
|
|
|
625
|
|
318
|
626 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
627 "save session: %p:%d", ssl_session, ssl_session->references);
|
|
318
|
628
|
|
260
|
629 peer = &rrp->peers->peer[rrp->current];
|
|
|
630
|
|
318
|
631 /* TODO: threads only mutex */
|
|
260
|
632 /* ngx_lock_mutex(rrp->peers->mutex); */
|
|
318
|
633
|
|
|
634 old_ssl_session = peer->ssl_session;
|
|
260
|
635 peer->ssl_session = ssl_session;
|
|
318
|
636
|
|
260
|
637 /* ngx_unlock_mutex(rrp->peers->mutex); */
|
|
|
638
|
|
318
|
639 if (old_ssl_session) {
|
|
|
640
|
|
|
641 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
|
|
332
|
642 "old session: %p:%d",
|
|
318
|
643 old_ssl_session, old_ssl_session->references);
|
|
|
644
|
|
260
|
645 /* TODO: may block */
|
|
318
|
646
|
|
|
647 ngx_ssl_free_session(old_ssl_session);
|
|
260
|
648 }
|
|
|
649 }
|
|
|
650
|
|
|
651 #endif
|
