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| ##include <ngx_http.h> ##include <ngx_core.h> ##include <arpa/inet.h> ##include <netinet/in.h>
##define ENABLE_RBTREE 1
typedef struct { int count; struct in_addr addr; }ngx_pv_table_t;
ngx_pv_table_t pv_table[256];
##if ENABLE_RBTREE static ngx_rbtree_t ngx_pv_rbtree; static ngx_rbtree_node_t ngx_pv_sentinel; void ngx_rbtree_insert_count_value(ngx_rbtree_node_t* temp, ngx_rbtree_node_t* node, ngx_rbtree_node_t* sentinel){ ntx_rbtree_node_t **p; for(;;){ if(node->key < temp->key){ p = &temp->left; }else if(node->key > temp->key){ p = &temp->right; }else{ return; }
if(*p == sentinel) break; temp = *p; } *p = node; node->parent = temp; node->left = sentinel; node->right = sentinel; ngx_rbt_red(node); } ngx_rbtree_key_t *ngx_rbtree_count_search(ngx_rbtree_t* rbtree, ngx_rbtree_key_t key) { ngx_rbtree_node_t *temp = rbtree->root; ngx_rbtree_node_t **p; for(;;){ if(key < temp->key){ p = &temp->left; }else if(key > temp->key){ p = &temp->right; }else{ return temp; } if(*p == &ngx_pv_sentinel) return NULL; temp = *p; } } void ngx_rbtree_count_traversal(ngx_rbtree_t* rbtree, , ngx_rbtree_node_t* node, char* html) { if(node != &ngx_pv_sentinel){ ngx_rbtree_count_traversal(rbtree, node->left, html); char str[INET_ADDRSTRLEN] = {0}; char buffer[128] = {0}; snprintf(buffer, 128, "req from : %s, count : %d <br/>", inet_ntop(AF_INET, &node->key, str, sizeof(str)), node->data); strcat(html, buffer); ngx_rbtree_count_traversal(rbtree, node->right, html); } } ##endif
static int ngx_http_encode_page(char *html) { sprintf(html, "<h1>hello handler</h1>"); strcat(html, "<h2>"); ##if ENABLE_RBTREE ngx_rbtree_count_traversal(&ngx_pv_rbtree, ngx_pv_rbtree.root, html); ##endif int i = 0; for(i = 0; i < 256 ; i++){ if(pv_table[i].count != 0){ char str[INET_ADDRSTRLEN] = {0}; char buffer[128] = {0}; snprintf(buffer, 128, "req from : %s, count : %d <br/>", inet_ntop(AF_INET, &pv_table[i].addr, str, sizeof(str)), pv_table[i].count); strcat(html, buffer); } } ##endif strcat(html, "</h2>"); return 0; }
ngx_int_t ngx_http_handler_count_handler(ngx_http_request_t *r) { struct sockaddr_in *client_aadr = (struct sockaddr_in *)r->connection->sockaddr; ##if ENABLE_RBTREE ngx_rbtree_key_t key = (ngx_rbtree_key_t)client_addr->sin_addr.s_addr; ngx_rbtree_node_t* node = ngx_rbtree_count_search(&ngx_pv_rbtree, key); if(node){ node -> data++; }else{ node = ngx_pcalloc(r->pool, sizeof(ngx_rbtree_node_t)); node->key = key; node->data = 1; ngx_rbtree_insert(&ngx_pv_rbtree, node); } ##else int idx = client_addr->sin_addr.s_addr >> 24; pv_table[idx].count++; memcpy(pv_table[idx].addr, &client_addr->sin_addr, sizeof(client_addr->sin_addr)); ##endif u_char html[1024] = {0}; ngx_http_encode_page((char*)html); r->headers_out.statu = 200; ngx_str_set(&r->headers_out.content_type, "text/html"); ngx_http_send_header(r);
ngx_buf_t *b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); ngx_chain_t out; out.buf = b; out.next = NULL; b->pos = html; b->last = html + sizeof(html); b->memory = 1; b->last_buf = 1; return ngx_http_out_filter(r, &out); }
char *ngx_http_handler_count_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf){ ##if ENABLE_RBTREE ngx_rbtree_init(&ngx_pv_rbtree, &ngx_pv_sentinel, ngx_rbtree_insert_count_value); ##endif ngx_http_core_loc_conf_t* corecf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); corecf->handler = ngx_http_handler_count_handler; return NGX_CONF_OK; }
static ngx_command_t ngx_http_handler_count_commands[] = { { ngx_string("six"), NGX_HTTP_LOC_CONF | NGX_CONF_NOARGS, ngx_http_handler_count_set, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, ngx_null_command };
static ngx_http_module_t ngx_http_handler_count_ctx = { NULL, NULL NULL, NULL NULL, NULL NULL, NULL };
ngx_module_t ngx_http_handler_count_module = { NGX_MODULE_V1, &ngx_http_handler_count_ctx, ngx_http_handler_count_commands, NGX_HTTP_MODULE, NULL,NULL,NULL,NULL, NULL,NULL,NULL, NGX_MODULE_V1_PADDING };
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