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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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660
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4 * Copyright (C) Nginx, Inc.
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260
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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14 /* the round robin data must be first */
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15 ngx_http_upstream_rr_peer_data_t rrp;
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16
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17 ngx_uint_t hash;
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18
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678
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19 u_char addrlen;
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20 u_char *addr;
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260
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21
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22 u_char tries;
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23
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24 ngx_event_get_peer_pt get_rr_peer;
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25 } ngx_http_upstream_ip_hash_peer_data_t;
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26
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27
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28 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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29 ngx_http_upstream_srv_conf_t *us);
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30 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc,
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31 void *data);
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32 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd,
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33 void *conf);
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34
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35
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36 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = {
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37
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38 { ngx_string("ip_hash"),
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39 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
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40 ngx_http_upstream_ip_hash,
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41 0,
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42 0,
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43 NULL },
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44
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45 ngx_null_command
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46 };
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47
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48
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49 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = {
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50 NULL, /* preconfiguration */
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51 NULL, /* postconfiguration */
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52
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53 NULL, /* create main configuration */
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54 NULL, /* init main configuration */
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55
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56 NULL, /* create server configuration */
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57 NULL, /* merge server configuration */
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58
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59 NULL, /* create location configuration */
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60 NULL /* merge location configuration */
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61 };
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62
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63
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64 ngx_module_t ngx_http_upstream_ip_hash_module = {
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65 NGX_MODULE_V1,
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66 &ngx_http_upstream_ip_hash_module_ctx, /* module context */
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67 ngx_http_upstream_ip_hash_commands, /* module directives */
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68 NGX_HTTP_MODULE, /* module type */
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69 NULL, /* init master */
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70 NULL, /* init module */
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71 NULL, /* init process */
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72 NULL, /* init thread */
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73 NULL, /* exit thread */
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74 NULL, /* exit process */
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75 NULL, /* exit master */
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76 NGX_MODULE_V1_PADDING
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77 };
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78
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79
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678
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80 static u_char ngx_http_upstream_ip_hash_pseudo_addr[3];
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81
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82
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83 static ngx_int_t
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260
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84 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
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85 {
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86 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
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87 return NGX_ERROR;
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88 }
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89
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90 us->peer.init = ngx_http_upstream_init_ip_hash_peer;
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91
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92 return NGX_OK;
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93 }
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94
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95
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96 static ngx_int_t
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97 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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98 ngx_http_upstream_srv_conf_t *us)
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99 {
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100 struct sockaddr_in *sin;
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678
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101 #if (NGX_HAVE_INET6)
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102 struct sockaddr_in6 *sin6;
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103 #endif
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260
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104 ngx_http_upstream_ip_hash_peer_data_t *iphp;
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105
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106 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t));
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107 if (iphp == NULL) {
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108 return NGX_ERROR;
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109 }
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110
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111 r->upstream->peer.data = &iphp->rrp;
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112
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113 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
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114 return NGX_ERROR;
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115 }
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116
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117 r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer;
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118
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678
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119 switch (r->connection->sockaddr->sa_family) {
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448
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120
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678
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121 case AF_INET:
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448
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122 sin = (struct sockaddr_in *) r->connection->sockaddr;
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123 iphp->addr = (u_char *) &sin->sin_addr.s_addr;
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124 iphp->addrlen = 3;
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125 break;
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448
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126
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678
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127 #if (NGX_HAVE_INET6)
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128 case AF_INET6:
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129 sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
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130 iphp->addr = (u_char *) &sin6->sin6_addr.s6_addr;
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131 iphp->addrlen = 16;
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132 break;
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133 #endif
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134
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135 default:
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136 iphp->addr = ngx_http_upstream_ip_hash_pseudo_addr;
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137 iphp->addrlen = 3;
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448
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138 }
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260
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139
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140 iphp->hash = 89;
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141 iphp->tries = 0;
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142 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
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143
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144 return NGX_OK;
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145 }
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146
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147
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148 static ngx_int_t
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149 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
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150 {
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151 ngx_http_upstream_ip_hash_peer_data_t *iphp = data;
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152
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153 time_t now;
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676
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154 ngx_int_t w;
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260
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155 uintptr_t m;
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156 ngx_uint_t i, n, p, hash;
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157 ngx_http_upstream_rr_peer_t *peer;
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158
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159 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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160 "get ip hash peer, try: %ui", pc->tries);
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161
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162 /* TODO: cached */
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163
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330
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164 if (iphp->tries > 20 || iphp->rrp.peers->single) {
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165 return iphp->get_rr_peer(pc, &iphp->rrp);
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166 }
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167
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168 now = ngx_time();
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169
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170 pc->cached = 0;
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171 pc->connection = NULL;
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172
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173 hash = iphp->hash;
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174
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175 for ( ;; ) {
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176
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177 for (i = 0; i < iphp->addrlen; i++) {
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178 hash = (hash * 113 + iphp->addr[i]) % 6271;
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179 }
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180
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676
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181 if (!iphp->rrp.peers->weighted) {
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182 p = hash % iphp->rrp.peers->number;
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183
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184 } else {
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185 w = hash % iphp->rrp.peers->total_weight;
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186
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187 for (i = 0; i < iphp->rrp.peers->number; i++) {
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188 w -= iphp->rrp.peers->peer[i].weight;
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189 if (w < 0) {
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190 break;
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191 }
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192 }
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193
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194 p = i;
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195 }
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196
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197 n = p / (8 * sizeof(uintptr_t));
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198 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
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199
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200 if (!(iphp->rrp.tried[n] & m)) {
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201
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202 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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203 "get ip hash peer, hash: %ui %04XA", p, m);
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204
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205 peer = &iphp->rrp.peers->peer[p];
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206
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207 /* ngx_lock_mutex(iphp->rrp.peers->mutex); */
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208
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209 if (!peer->down) {
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210
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211 if (peer->max_fails == 0 || peer->fails < peer->max_fails) {
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212 break;
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213 }
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214
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215 if (now - peer->checked > peer->fail_timeout) {
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216 peer->checked = now;
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217 break;
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218 }
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290
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219 }
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220
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221 iphp->rrp.tried[n] |= m;
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222
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223 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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224
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225 pc->tries--;
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226 }
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227
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228 if (++iphp->tries >= 20) {
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229 return iphp->get_rr_peer(pc, &iphp->rrp);
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230 }
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231 }
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232
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233 iphp->rrp.current = p;
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234
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235 pc->sockaddr = peer->sockaddr;
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236 pc->socklen = peer->socklen;
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237 pc->name = &peer->name;
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238
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239 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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240
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241 iphp->rrp.tried[n] |= m;
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242 iphp->hash = hash;
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243
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244 return NGX_OK;
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245 }
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246
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247
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248 static char *
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249 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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250 {
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251 ngx_http_upstream_srv_conf_t *uscf;
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252
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253 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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254
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255 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash;
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256
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257 uscf->flags = NGX_HTTP_UPSTREAM_CREATE
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676
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258 |NGX_HTTP_UPSTREAM_WEIGHT
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260
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259 |NGX_HTTP_UPSTREAM_MAX_FAILS
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260 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
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261 |NGX_HTTP_UPSTREAM_DOWN;
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262
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263 return NGX_CONF_OK;
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264 }
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