#include "future.h"
struct tango_cache_instance{};
struct tango_cache_update_ctx{};
#define	CACHE_FRAG_BEGIN	0x01
#define	CACHE_FRAG_DATA		0x02
#define	CACHE_FRAG_END		0x04
#define	CACHE_FRAG_FULL		(CACHE_FRAG_BEGIN|CACHE_FRAG_DATA|CACHE_FRAG_END)
struct tango_cache_result
{
	char frag_type;
	unsigned char* data_frag;
	size_t size;
};
struct tango_cache_meta
{
	const char* url;
	const char* content_type;
};
struct tango_cache_instance* tango_cache_init(event_base* evbase,const char* profile_path, const char* section);

int tango_cache_fetch(struct tango_cache_instance* instance,struct future* future, const char* http_hdr, const char* url);
//following tfe_stream_write_xx functions are NOT thread safe, MUST be called in the stream process thread.

struct tango_cache_update_ctx* tango_cache_update_start(struct tango_cache_instance* instance,struct future* future, const char* http_hdr, const char* url);
/*
@return 0 if successful, or -1 if an error occurred
*/
int tango_cache_update_frag(struct tango_cache_update_ctx* ctx,const unsigned char *data, size_t size);
void tango_cache_update_end(struct tango_cache_update_ctx*ctx);