ngx_http_variable_value_t * ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key) { ngx_http_variable_t *v; ngx_http_variable_value_t *vv; ngx_http_core_main_conf_t *cmcf; cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); //先根据哈希表查找变量是否存在,如果存在,则根据其保存在哈希表里面的index获取变量的内容。或者调用get_handler v = ngx_hash_find(&cmcf->variables_hash, key, name->data, name->len); if (v) { if (v->flags & NGX_HTTP_VAR_INDEXED) { return ngx_http_get_flushed_variable(r, v->index); } else { vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)); if (vv && v->get_handler(r, vv, v->data) == NGX_OK) { return vv; } return NULL; } } //如果不存在variables里面,则看一下是否是预定义的变量。 vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)); if (vv == NULL) { return NULL; } if (ngx_strncmp(name->data, "http_", 5) == 0) { if (ngx_http_variable_unknown_header_in(r, vv, (uintptr_t) name) == NGX_OK){ return vv; } return NULL; } if (ngx_strncmp(name->data, "sent_http_", 10) == 0) { if (ngx_http_variable_unknown_header_out(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "upstream_http_", 14) == 0) { if (ngx_http_upstream_header_variable(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "cookie_", 7) == 0) { if (ngx_http_variable_cookie(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "arg_", 4) == 0) { if (ngx_http_variable_argument(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } vv->not_found = 1; return vv; }
ngx_http_variable_value_t * ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key, ngx_uint_t nowarn) { ngx_http_variable_t *v; ngx_http_variable_value_t *vv; ngx_http_core_main_conf_t *cmcf; cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); v = ngx_hash_find(&cmcf->variables_hash, key, name->data, name->len); if (v) { if (v->flags & NGX_HTTP_VAR_INDEXED) { return ngx_http_get_indexed_variable(r, v->index); } else { vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)); if (vv && v->get_handler(r, vv, v->data) == NGX_OK) { return vv; } return NULL; } } vv = ngx_palloc(r->pool, sizeof(ngx_http_variable_value_t)); if (vv == NULL) { return NULL; } if (ngx_strncmp(name->data, "http_", 5) == 0) { if (ngx_http_variable_unknown_header_in(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "sent_http_", 10) == 0) { if (ngx_http_variable_unknown_header_out(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "upstream_http_", 10) == 0) { if (ngx_http_upstream_header_variable(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "cookie_", 7) == 0) { if (ngx_http_variable_cookie(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } if (ngx_strncmp(name->data, "arg_", 4) == 0) { if (ngx_http_variable_argument(r, vv, (uintptr_t) name) == NGX_OK) { return vv; } return NULL; } vv->not_found = 1; if (nowarn == 0) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "unknown \"%V\" variable", name); } return vv; }