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6115
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1
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2 /*
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3 * Copyright (C) Ruslan Ermilov
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4 * Copyright (C) Nginx, Inc.
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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_stream.h>
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11
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12
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13 static char *ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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14 void *conf);
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15 static ngx_int_t ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone,
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16 void *data);
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17
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18
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19 static ngx_command_t ngx_stream_upstream_zone_commands[] = {
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20
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21 { ngx_string("zone"),
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22 NGX_STREAM_UPS_CONF|NGX_CONF_TAKE2,
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23 ngx_stream_upstream_zone,
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24 0,
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25 0,
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26 NULL },
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27
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28 ngx_null_command
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29 };
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30
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31
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32 static ngx_stream_module_t ngx_stream_upstream_zone_module_ctx = {
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33 NULL, /* create main configuration */
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34 NULL, /* init main configuration */
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35
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36 NULL, /* create server configuration */
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37 NULL, /* merge server configuration */
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38 };
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39
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40
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41 ngx_module_t ngx_stream_upstream_zone_module = {
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42 NGX_MODULE_V1,
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43 &ngx_stream_upstream_zone_module_ctx, /* module context */
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44 ngx_stream_upstream_zone_commands, /* module directives */
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45 NGX_STREAM_MODULE, /* module type */
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46 NULL, /* init master */
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47 NULL, /* init module */
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48 NULL, /* init process */
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49 NULL, /* init thread */
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50 NULL, /* exit thread */
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51 NULL, /* exit process */
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52 NULL, /* exit master */
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53 NGX_MODULE_V1_PADDING
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54 };
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55
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56
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57 static char *
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58 ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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59 {
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60 ssize_t size;
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61 ngx_str_t *value;
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62 ngx_stream_upstream_srv_conf_t *uscf;
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63
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64 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module);
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65
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66 value = cf->args->elts;
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67
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68 if (!value[1].len) {
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69 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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70 "invalid zone name \"%V\"", &value[1]);
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71 return NGX_CONF_ERROR;
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72 }
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73
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74 size = ngx_parse_size(&value[2]);
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75
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76 if (size == NGX_ERROR) {
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77 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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78 "invalid zone size \"%V\"", &value[2]);
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79 return NGX_CONF_ERROR;
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80 }
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81
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82 if (size < (ssize_t) (8 * ngx_pagesize)) {
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83 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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84 "zone \"%V\" is too small", &value[1]);
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85 return NGX_CONF_ERROR;
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86 }
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87
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88 uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size,
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89 &ngx_stream_upstream_module);
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90 if (uscf->shm_zone == NULL) {
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91 return NGX_CONF_ERROR;
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92 }
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93
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94 if (uscf->shm_zone->data) {
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95 uscf = uscf->shm_zone->data;
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96
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97 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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98 "upstream \"%V\" in %s:%ui "
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99 "is already bound to zone \"%V\"",
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100 &uscf->host, uscf->file_name, uscf->line,
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101 &value[1]);
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102 return NGX_CONF_ERROR;
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103 }
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104
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105 uscf->shm_zone->init = ngx_stream_upstream_init_zone;
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106 uscf->shm_zone->data = uscf;
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107
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108 uscf->shm_zone->noreuse = 1;
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109
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110 return NGX_CONF_OK;
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111 }
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112
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113
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114 static ngx_int_t
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115 ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data)
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116 {
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117 ngx_stream_upstream_srv_conf_t *ouscf = data;
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118
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119 size_t len;
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120 ngx_slab_pool_t *shpool;
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121 ngx_stream_upstream_rr_peer_t *peer, **peerp;
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122 ngx_stream_upstream_rr_peers_t *peers, *backup;
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123 ngx_stream_upstream_srv_conf_t *uscf;
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124
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125 uscf = shm_zone->data;
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126
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127 if (ouscf) {
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128 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
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129 "zone \"%V\" cannot be reused", &shm_zone->shm.name);
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130 return NGX_ERROR;
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131 }
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132
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133 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
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134
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135 if (shm_zone->shm.exists) {
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136 return NGX_ERROR;
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137 }
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138
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139
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140 /* copy peers to shared memory */
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141
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142 len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len;
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143
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144 shpool->log_ctx = ngx_slab_alloc(shpool, len);
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145 if (shpool->log_ctx == NULL) {
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146 return NGX_ERROR;
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147 }
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148
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149 ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z",
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150 &shm_zone->shm.name);
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151
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152 peers = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t));
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153 if (peers == NULL) {
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154 return NGX_ERROR;
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155 }
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156
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157 ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_stream_upstream_rr_peers_t));
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158
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159 peers->shpool = shpool;
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160
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161 for (peerp = &peers->peer; *peerp; peerp = &peer->next) {
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162 /* pool is unlocked */
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163 peer = ngx_slab_calloc_locked(shpool,
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164 sizeof(ngx_stream_upstream_rr_peer_t));
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165 if (peer == NULL) {
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166 return NGX_ERROR;
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167 }
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168
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169 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t));
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170
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171 *peerp = peer;
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172 }
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173
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174 if (peers->next == NULL) {
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175 goto done;
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176 }
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177
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178 backup = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t));
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179 if (backup == NULL) {
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180 return NGX_ERROR;
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181 }
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182
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183 ngx_memcpy(backup, peers->next, sizeof(ngx_stream_upstream_rr_peers_t));
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184
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185 backup->shpool = shpool;
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186
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187 for (peerp = &backup->peer; *peerp; peerp = &peer->next) {
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188 /* pool is unlocked */
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189 peer = ngx_slab_calloc_locked(shpool,
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190 sizeof(ngx_stream_upstream_rr_peer_t));
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191 if (peer == NULL) {
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192 return NGX_ERROR;
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193 }
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194
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195 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t));
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196
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197 *peerp = peer;
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198 }
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199
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200 peers->next = backup;
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201
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202 done:
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203
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204 uscf->peer.data = peers;
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205
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206 return NGX_OK;
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207 }
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