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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 u_char addr[3];
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19
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20 u_char tries;
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21
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22 ngx_event_get_peer_pt get_rr_peer;
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23 } ngx_http_upstream_ip_hash_peer_data_t;
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24
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25
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26 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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27 ngx_http_upstream_srv_conf_t *us);
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28 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc,
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29 void *data);
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30 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd,
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31 void *conf);
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32
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33
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34 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = {
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35
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36 { ngx_string("ip_hash"),
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37 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
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38 ngx_http_upstream_ip_hash,
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39 0,
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40 0,
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41 NULL },
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42
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43 ngx_null_command
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44 };
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45
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46
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47 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = {
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48 NULL, /* preconfiguration */
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49 NULL, /* postconfiguration */
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50
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51 NULL, /* create main configuration */
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52 NULL, /* init main configuration */
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53
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54 NULL, /* create server configuration */
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55 NULL, /* merge server configuration */
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56
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57 NULL, /* create location configuration */
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58 NULL /* merge location configuration */
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59 };
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60
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61
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62 ngx_module_t ngx_http_upstream_ip_hash_module = {
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63 NGX_MODULE_V1,
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64 &ngx_http_upstream_ip_hash_module_ctx, /* module context */
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65 ngx_http_upstream_ip_hash_commands, /* module directives */
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66 NGX_HTTP_MODULE, /* module type */
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67 NULL, /* init master */
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68 NULL, /* init module */
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69 NULL, /* init process */
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70 NULL, /* init thread */
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71 NULL, /* exit thread */
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72 NULL, /* exit process */
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73 NULL, /* exit master */
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74 NGX_MODULE_V1_PADDING
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75 };
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76
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77
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78 ngx_int_t
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79 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
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80 {
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81 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
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82 return NGX_ERROR;
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83 }
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84
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85 us->peer.init = ngx_http_upstream_init_ip_hash_peer;
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86
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87 return NGX_OK;
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88 }
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89
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90
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91 static ngx_int_t
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92 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r,
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93 ngx_http_upstream_srv_conf_t *us)
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94 {
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292
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95 u_char *p;
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260
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96 struct sockaddr_in *sin;
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97 ngx_http_upstream_ip_hash_peer_data_t *iphp;
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98
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99 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t));
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100 if (iphp == NULL) {
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101 return NGX_ERROR;
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102 }
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103
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104 r->upstream->peer.data = &iphp->rrp;
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105
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106 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
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107 return NGX_ERROR;
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108 }
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109
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110 r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer;
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111
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112 /* AF_INET only */
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448
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113
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114 if (r->connection->sockaddr->sa_family == AF_INET) {
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115
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116 sin = (struct sockaddr_in *) r->connection->sockaddr;
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117 p = (u_char *) &sin->sin_addr.s_addr;
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118 iphp->addr[0] = p[0];
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119 iphp->addr[1] = p[1];
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120 iphp->addr[2] = p[2];
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121
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122 } else {
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123 iphp->addr[0] = 0;
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124 iphp->addr[1] = 0;
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125 iphp->addr[2] = 0;
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126 }
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260
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127
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128 iphp->hash = 89;
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129 iphp->tries = 0;
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130 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
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131
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132 return NGX_OK;
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133 }
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134
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135
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136 static ngx_int_t
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137 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
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138 {
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139 ngx_http_upstream_ip_hash_peer_data_t *iphp = data;
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140
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141 time_t now;
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142 uintptr_t m;
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143 ngx_uint_t i, n, p, hash;
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144 ngx_http_upstream_rr_peer_t *peer;
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145
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146 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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147 "get ip hash peer, try: %ui", pc->tries);
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148
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149 /* TODO: cached */
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150
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330
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151 if (iphp->tries > 20 || iphp->rrp.peers->single) {
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152 return iphp->get_rr_peer(pc, &iphp->rrp);
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153 }
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154
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155 now = ngx_time();
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156
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157 pc->cached = 0;
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158 pc->connection = NULL;
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159
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160 hash = iphp->hash;
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161
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162 for ( ;; ) {
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163
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164 for (i = 0; i < 3; i++) {
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165 hash = (hash * 113 + iphp->addr[i]) % 6271;
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166 }
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167
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168 p = hash % iphp->rrp.peers->number;
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169
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170 n = p / (8 * sizeof(uintptr_t));
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330
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171 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
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260
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172
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173 if (!(iphp->rrp.tried[n] & m)) {
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174
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175 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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176 "get ip hash peer, hash: %ui %04XA", p, m);
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177
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178 peer = &iphp->rrp.peers->peer[p];
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179
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180 /* ngx_lock_mutex(iphp->rrp.peers->mutex); */
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181
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182 if (!peer->down) {
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183
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274
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184 if (peer->max_fails == 0 || peer->fails < peer->max_fails) {
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185 break;
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186 }
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260
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187
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188 if (now - peer->accessed > peer->fail_timeout) {
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189 peer->fails = 0;
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190 break;
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191 }
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290
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192 }
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260
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193
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290
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194 iphp->rrp.tried[n] |= m;
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260
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195
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196 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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197
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198 pc->tries--;
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199 }
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200
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201 if (++iphp->tries >= 20) {
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202 return iphp->get_rr_peer(pc, &iphp->rrp);
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203 }
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204 }
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205
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206 iphp->rrp.current = p;
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207
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208 pc->sockaddr = peer->sockaddr;
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209 pc->socklen = peer->socklen;
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210 pc->name = &peer->name;
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211
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212 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */
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213
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214 iphp->rrp.tried[n] |= m;
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215 iphp->hash = hash;
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216
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217 return NGX_OK;
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218 }
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219
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220
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221 static char *
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222 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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223 {
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224 ngx_http_upstream_srv_conf_t *uscf;
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225
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226 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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227
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228 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash;
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229
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230 uscf->flags = NGX_HTTP_UPSTREAM_CREATE
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231 |NGX_HTTP_UPSTREAM_MAX_FAILS
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232 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
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233 |NGX_HTTP_UPSTREAM_DOWN;
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234
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235 return NGX_CONF_OK;
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236 }
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