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cachecontrol.c
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cachecontrol.c
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#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "ts/ts.h"
#include "common.h"
#include "ats_common.h"
#define PLUGIN_NAME "longcache"
static Conf_Cache_Controls cache_controls;
static int get_value(char *begin,char *value);
static int load_config_file(const char *config_file);
static void insert_cache_controls(int cur_count,char *dest_domain,int status,unsigned int maxage,char * suffix);
static void copy_cache_controls(Conf_Cache_Control *item_old,int capacity_old,Conf_Cache_Control *item_new,int capacity_new);
static void insert_item(Conf_Cache_Control *item,int capacity,char *dest_domain,int status,unsigned int maxage,char * suffix);
static int get_value(char *begin,char *value)
{
char *p,*temp1;
p = strstr(begin,"=");
if(p){
p = p + 1;
temp1 = p;
while(*temp1 != ' ' && (*temp1 != '\r' || *temp1 != '\n') && *temp1 != '\0' && *temp1 != '@')
temp1++;
strncpy(value,p,temp1 - p);
if(strlen(value) > 0)
return 1;
}
return 0;
}
static void copy_cache_controls(Conf_Cache_Control *item_old,int capacity_old,Conf_Cache_Control *item_new,int capacity_new)
{
Conf_Cache_Control item_temp;
int i;
for(i=0;i < capacity_old;i++)
{
item_temp = item_old[i];
if(item_temp.flags == 1)
insert_item(item_new,capacity_new,item_temp.dest_domain,item_temp.status,item_temp.maxage,item_temp.suffix);
}
}
static void insert_item(Conf_Cache_Control *item,int capacity,char *dest_domain,int status,unsigned int maxage,char * suffix)
{
int hash_val,new_hash_val;
Conf_Cache_Control item_cache_control;
char suffix_temp[20]={0};
if(suffix[0] != '.')
sprintf(suffix_temp,".%s",suffix);
else
strcpy(suffix_temp,suffix);
hash_val = hash(suffix_temp)%capacity;
item_cache_control = item[hash_val];
while(item_cache_control.flags == 1 && item_cache_control.next != NULL){
item_cache_control = *(item_cache_control.next);
hash_val = item_cache_control.hash_val;
}
new_hash_val = hash_val;
while(item[new_hash_val].flags == 1){
new_hash_val = (new_hash_val + 1)%capacity;
}
memset(item[new_hash_val].suffix,'\0',sizeof(item[new_hash_val].suffix));
strcpy(item[new_hash_val].suffix,suffix_temp);
memset(item[new_hash_val].dest_domain,'\0',sizeof(item[new_hash_val].dest_domain));
strcpy(item[new_hash_val].dest_domain,dest_domain);
item[new_hash_val].flags = 1;
item[new_hash_val].status = status;
item[new_hash_val].maxage = maxage;
item[new_hash_val].next = NULL;
item[new_hash_val].hash_val = new_hash_val;
//TSDebug(PLUGIN_NAME, "suffix:%s,hash_val:%d",item[new_hash_val].suffix,new_hash_val);
if(new_hash_val != hash_val){
item[hash_val].next = &item[new_hash_val];
//TSDebug(PLUGIN_NAME, "cur_suffix:%s,curl_hash_val:%d,pre_suffix:%s,pre_hash_val:%d",
// item[hash_val].next->suffix,item[hash_val].next->hash_val,item[hash_val].suffix,item[hash_val].hash_val);
}
}
static void insert_cache_controls(int cur_count,char *dest_domain,int status,unsigned int maxage,char * suffix)
{
Conf_Cache_Control *item;
int capacity;
if(cur_count >= (cache_controls.capacity/2))
{
TSDebug(PLUGIN_NAME, "cache_controls.capacity:%d",cache_controls.capacity);
capacity = next_prime(cache_controls.capacity + 1);
item = calloc(capacity,sizeof(Conf_Cache_Control));
if(cache_controls.item && cache_controls.capacity > 0){
copy_cache_controls(cache_controls.item,cache_controls.capacity,item,capacity);
TSDebug(PLUGIN_NAME, "free free");
free(cache_controls.item);
}
cache_controls.capacity = capacity;
cache_controls.item = item;
}
insert_item(cache_controls.item,cache_controls.capacity,dest_domain,status,maxage,suffix);
}
static int load_config_file(const char *config_file) {
char default_config_file[MAXSIZE];
TSFile fh;
if (!config_file) {
memset(default_config_file,'\0',sizeof(default_config_file));
sprintf(default_config_file, "%s/cachecontrol.config", "/sysconfig");
config_file = (const char *)default_config_file;
}
fh = TSfopen(config_file, "r");
if (!fh) {
goto error;
}
char *p,*temp1;
char value[MAXSIZE];
char buffer[MAXSIZE];
char dest_domain[MAXSIZE];
char valueTemp[20];
unsigned int k;
int status;
unsigned int maxage;
int cur_count = 0;
memset(buffer,'\0',sizeof(buffer));
while (TSfgets(fh, buffer, sizeof(buffer) - 1)) {
if(buffer[0] == '#')
{
memset(buffer,'\0',sizeof(buffer));
continue;
}
//TSDebug(PLUGIN_NAME, "%s",buffer);
p = strstr(buffer,"@dest_domain");
if(p){
memset(value,'\0',sizeof(value));
if(get_value(p,value)){
memset(dest_domain,'\0',sizeof(dest_domain));
strcpy(dest_domain,value);
}else{
goto error;
}
}else{
goto error;
}
p = strstr(buffer,"@status");
if(p){
memset(value,'\0',sizeof(value));
if(get_value(p,value)){
k = atoi(value);
if(k)
status = k;
else
goto error;
}else{
goto error;
}
}else{
status = 200;
}
p = strstr(buffer,"@maxage");
if(p){
memset(value,'\0',sizeof(value));
if(get_value(p,value)){
k = atoi(value);
if(k){
maxage = k;
}else{
if(strncmp(value,"0",1) == 0){
maxage = 0;
}else{
goto error;
}
}
}else{
goto error;
}
}else{
maxage = 86400;
}
p = strstr(buffer,"@suffix");
if(p){
memset(value,'\0',sizeof(value));
if(get_value(p,value)){
temp1 = value;
p = strstr(temp1,"|");
while(p){
memset(valueTemp,'\0',sizeof(valueTemp));
strncpy(valueTemp,temp1,p - temp1);
if(strlen(valueTemp) > 0){
insert_cache_controls(cur_count,dest_domain,status, maxage,valueTemp);
cur_count++;
}
temp1 = p + 1;
if(temp1)
p = strstr(temp1,"|");
else
p = temp1;
}
if(temp1 && strlen(temp1) > 0){
insert_cache_controls(cur_count,dest_domain,status, maxage,temp1);
cur_count++;
}
}else{
goto error;
}
}else{
goto error;
}
memset(buffer,'\0',sizeof(buffer));
}
TSfclose(fh);
Conf_Cache_Control item;
int j;
for(j = 0; j < cache_controls.capacity; j++)
{
item = cache_controls.item[j];
if(item.flags == 1)
TSDebug(PLUGIN_NAME,"suffix:%s,hash_val:%d,dest_domain:%s,maxage:%d,status:%d,flags:%d",
item.suffix,item.hash_val,item.dest_domain,item.maxage,item.status,item.flags);
}
TSDebug(PLUGIN_NAME,"Load Config Success!");
return 1;
error:
if (fh) {
TSfclose(fh);
}
return 0;
}
static void
modify_header(TSCont contp,TSHttpTxn txnp)
{
char *url;
int url_length;
char *url_host;
int hash_val;
char filename[10];
char maxage[256];
TSHttpStatus resp_status;
url = TSHttpTxnEffectiveUrlStringGet(txnp, &url_length);
if(!url)
return;
url_host = GetUrlHost(url);
resp_status = StaServerRespStatusGet(txnp);
memset(filename,'\0',sizeof(filename));
GetUrlType(url,url_length,filename);
if(strlen(filename) <= 0){
memset(filename,'\0',sizeof(filename));
strcpy(filename,".*");
}
hash_val = hash(filename)%cache_controls.capacity;
Conf_Cache_Control item = cache_controls.item[hash_val];
//TSDebug(PLUGIN_NAME,"filename:%s,hash_val:%d",filename,hash_val);
while(item.flags == 1){
if(!strcmp(item.suffix,filename) && resp_status == item.status &&
(!strcmp(url_host,item.dest_domain) || !strcmp(".*",item.dest_domain))){
memset(maxage,'\0',sizeof(maxage));
sprintf(maxage,"max-age=%d",item.maxage);
//TSDebug(PLUGIN_NAME,"maxage:%s,filename:%s",maxage,filename);
goto addfield;
}
if(item.next){
item = *(item.next);
//TSDebug(PLUGIN_NAME,"suffix:%s,hash_val:%d,status:%d",item.suffix,item.hash_val,item.status);
}
else
break;
}
if(TS_HTTP_STATUS_OK != resp_status)
TSHttpTxnServerRespNoStoreSet(txnp,1);
goto done;
addfield:
StaSerRespMimeHdrFieldDestroy(txnp,(char *)TS_MIME_FIELD_DATE, TS_MIME_LEN_DATE);
StaSerRespMimeHdrFieldDestroy(txnp,(char *)TS_MIME_FIELD_AGE, TS_MIME_LEN_AGE);
StaSerRespMimeHdrFieldAppend(txnp,(char *)TS_MIME_FIELD_CACHE_CONTROL, TS_MIME_LEN_CACHE_CONTROL,maxage,strlen(maxage));
done:
if(url){
TSfree(url);
}
}
static int
cache_control_plugin(TSCont contp , TSEvent event, void *edata)
{
TSHttpTxn txnp = (TSHttpTxn) edata;
switch (event) {
case TS_EVENT_HTTP_READ_RESPONSE_HDR:
modify_header(contp,txnp);
break;
default:
break;
}
TSHttpTxnReenable(txnp, TS_EVENT_HTTP_CONTINUE);
return 0;
}
void TSPluginInit (int argc, const char *argv[])
{
/*
TSPluginRegistrationInfo info;
info.plugin_name = (char*)"stateam";
info.vendor_name = (char*)"stateam";
info.support_email = (char*)"[email protected]";
if (TSPluginRegister(TS_SDK_VERSION_3_0, &info) != TS_SUCCESS) {
return;
}*/
if(!load_config_file(NULL))
{
TSError("Plugin load_config_file failed. \n");
return;
}
TSCont cont = TSContCreate(cache_control_plugin, NULL);
TSHttpHookAdd(TS_HTTP_READ_RESPONSE_HDR_HOOK, cont);
}