#ifndef _CURLFETCH_H_INCLUDED_
#define _CURLFETCH_H_INCLUDED_
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <functional>
#include <memory>
#include "bufxchange.h"
#include "abuffer.h"
//
// Wrapper for a libcurl transfer. This uses the curl_easy interface
// in a separate thread, so any number of transfers may be performed
// in parallel.
//
// The transfer is aborted when the object is deleted, with proper
// cleanup (in practise, if the curl thread is currently working
// inside curl_easy_transfer, the curl fd is closed to abort any
// current waiting).
//
// The end of transfer is signalled by pushing an empty buffer on the queue
//
// All methods are supposedly thread-safe
class CurlFetch {
public:
CurlFetch(const std::string& url);
~CurlFetch();
const std::string& url();
void setTimeout(int secs);
/// Start the transfer to the output queue.
bool start(BufXChange<ABuffer*> *queue, uint64_t offset = 0);
// Wait for HTTP headers. This allows, e.g. doing stuff depending
// on content-type before proceeding with the actual data transfer
bool waitForHeaders(int maxSecs = 0);
// Retrieve header value (after a successful waitForHeaders).
bool headerValue(const std::string& nm, std::string& val);
// Check if the curl thread is done and retrieve the results if it
// is. This does not wait, it returns false if the transfer is
// still running.
bool curlDone(int *curlcode, int *http_code);
/// Reset after transfer done, for retrying for exemple.
void reset();
// Callbacks
// A function to create the first buffer (typically for prepending
// a wav header to a raw pcm stream. If set this is called from
// the first curl write callback, before processing the curl data,
// so this happens at a point where the client may have had a look
// at the headers).
void setBuf1GenCB(std::function<bool(std::string& buf,void*,int)>);
// Called after curl_easy_perform returns
void setEOFetchCB(std::function<void(bool ok, u_int64_t count)> eofcb);
// Called every time we get new data from curl
void setFetchBytesCB(std::function<void(u_int64_t count)> fbcb);
class Internal;
private:
std::unique_ptr<Internal> m;
};
#endif /* _CURLFETCH_H_INCLUDED_ */