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260
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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13 /* the round robin data must be first */
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14 ngx_http_upstream_rr_peer_data_t rrp;
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15
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16 ngx_uint_t hash;
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17
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18 /* AF_INET only */
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19 u_char addr[3];
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20
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21 u_char tries;
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22
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23 ngx_event_get_peer_pt get_rr_peer;
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24 } ngx_http_upstream_ip_hash_peer_data_t;
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25
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26
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27 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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28 ngx_http_upstream_srv_conf_t *us);
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29 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc,
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30 void *data);
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31 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd,
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32 void *conf);
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33
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34
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35 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = {
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36
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37 { ngx_string("ip_hash"),
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38 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
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39 ngx_http_upstream_ip_hash,
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40 0,
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41 0,
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42 NULL },
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43
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44 ngx_null_command
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45 };
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46
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47
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48 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = {
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49 NULL, /* preconfiguration */
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50 NULL, /* postconfiguration */
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51
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52 NULL, /* create main configuration */
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53 NULL, /* init main configuration */
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54
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55 NULL, /* create server configuration */
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56 NULL, /* merge server configuration */
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57
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58 NULL, /* create location configuration */
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59 NULL /* merge location configuration */
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60 };
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61
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62
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63 ngx_module_t ngx_http_upstream_ip_hash_module = {
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64 NGX_MODULE_V1,
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65 &ngx_http_upstream_ip_hash_module_ctx, /* module context */
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66 ngx_http_upstream_ip_hash_commands, /* module directives */
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67 NGX_HTTP_MODULE, /* module type */
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68 NULL, /* init master */
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69 NULL, /* init module */
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70 NULL, /* init process */
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71 NULL, /* init thread */
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72 NULL, /* exit thread */
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73 NULL, /* exit process */
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74 NULL, /* exit master */
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75 NGX_MODULE_V1_PADDING
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76 };
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77
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78
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79 ngx_int_t
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80 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
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81 {
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82 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
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83 return NGX_ERROR;
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84 }
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85
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86 us->peer.init = ngx_http_upstream_init_ip_hash_peer;
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87
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88 return NGX_OK;
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89 }
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90
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91
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92 static ngx_int_t
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93 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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94 ngx_http_upstream_srv_conf_t *us)
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95 {
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292
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96 u_char *p;
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260
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97 struct sockaddr_in *sin;
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98 ngx_http_upstream_ip_hash_peer_data_t *iphp;
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99
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100 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t));
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101 if (iphp == NULL) {
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102 return NGX_ERROR;
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103 }
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104
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105 r->upstream->peer.data = &iphp->rrp;
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106
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107 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
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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.get = ngx_http_upstream_get_ip_hash_peer;
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112
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113 /* AF_INET only */
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114 sin = (struct sockaddr_in *) r->connection->sockaddr;
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292
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115 p = (u_char *) &sin->sin_addr.s_addr;
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116 iphp->addr[0] = p[0];
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117 iphp->addr[1] = p[1];
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118 iphp->addr[2] = p[2];
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260
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119
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120 iphp->hash = 89;
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121 iphp->tries = 0;
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122 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
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123
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124 return NGX_OK;
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125 }
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126
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127
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128 static ngx_int_t
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129 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
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130 {
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131 ngx_http_upstream_ip_hash_peer_data_t *iphp = data;
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132
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133 time_t now;
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134 uintptr_t m;
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135 ngx_uint_t i, n, p, hash;
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136 ngx_http_upstream_rr_peer_t *peer;
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137
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138 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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139 "get ip hash peer, try: %ui", pc->tries);
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140
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141 /* TODO: cached */
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142
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143 if (iphp->tries > 20 || iphp->rrp.peers->number == 1) {
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144 return iphp->get_rr_peer(pc, &iphp->rrp);
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145 }
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146
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147 now = ngx_time();
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148
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149 pc->cached = 0;
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150 pc->connection = NULL;
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151
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152 hash = iphp->hash;
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153
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154 for ( ;; ) {
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155
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156 for (i = 0; i < 3; i++) {
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157 hash = (hash * 113 + iphp->addr[i]) % 6271;
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158 }
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159
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160 p = hash % iphp->rrp.peers->number;
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161
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162 n = p / (8 * sizeof(uintptr_t));
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163 m = 1 << p % (8 * sizeof(uintptr_t));
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164
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165 if (!(iphp->rrp.tried[n] & m)) {
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166
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167 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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168 "get ip hash peer, hash: %ui %04XA", p, m);
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169
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170 peer = &iphp->rrp.peers->peer[p];
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171
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172 /* ngx_lock_mutex(iphp->rrp.peers->mutex); */
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173
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174 if (!peer->down) {
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175
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274
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176 if (peer->max_fails == 0 || peer->fails < peer->max_fails) {
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177 break;
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178 }
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260
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179
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180 if (now - peer->accessed > peer->fail_timeout) {
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181 peer->fails = 0;
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182 break;
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183 }
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290
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184 }
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260
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185
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290
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186 iphp->rrp.tried[n] |= m;
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187
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188 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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189
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190 pc->tries--;
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191 }
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192
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193 if (++iphp->tries >= 20) {
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194 return iphp->get_rr_peer(pc, &iphp->rrp);
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195 }
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196 }
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197
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198 pc->sockaddr = peer->sockaddr;
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199 pc->socklen = peer->socklen;
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200 pc->name = &peer->name;
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201
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202 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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203
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204 iphp->rrp.tried[n] |= m;
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205 iphp->hash = hash;
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206
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207 return NGX_OK;
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208 }
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209
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210
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211 static char *
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212 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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213 {
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214 ngx_http_upstream_srv_conf_t *uscf;
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215
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216 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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217
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218 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash;
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219
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220 uscf->flags = NGX_HTTP_UPSTREAM_CREATE
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221 |NGX_HTTP_UPSTREAM_MAX_FAILS
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222 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
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223 |NGX_HTTP_UPSTREAM_DOWN;
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224
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225 return NGX_CONF_OK;
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226 }
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