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#ifndef FETCH_NEGOTIATOR_H
#define FETCH_NEGOTIATOR_H
struct commit;
/*
* An object that supplies the information needed to negotiate the contents of
* the to-be-sent packfile during a fetch.
*
* To set up the negotiator, call fetch_negotiator_init(), then known_common()
* (0 or more times), then add_tip() (0 or more times).
*
* Then, when "have" lines are required, call next(). Call ack() to report what
* the server tells us.
*
* Once negotiation is done, call release(). The negotiator then cannot be used
* (unless reinitialized with fetch_negotiator_init()).
*/
struct fetch_negotiator {
/*
* Before negotiation starts, indicate that the server is known to have
* this commit.
*/
void (*known_common)(struct fetch_negotiator *, struct commit *);
/*
* Once this function is invoked, known_common() cannot be invoked any
* more.
*
* Indicate that this commit and all its ancestors are to be checked
* for commonality with the server.
*/
void (*add_tip)(struct fetch_negotiator *, struct commit *);
/*
* Once this function is invoked, known_common() and add_tip() cannot
* be invoked any more.
*
* Return the next commit that the client should send as a "have" line.
*/
const struct object_id *(*next)(struct fetch_negotiator *);
/*
* Inform the negotiator that the server has the given commit. This
* method must only be called on commits returned by next().
*/
int (*ack)(struct fetch_negotiator *, struct commit *);
void (*release)(struct fetch_negotiator *);
/* internal use */
void *data;
};
void fetch_negotiator_init(struct fetch_negotiator *negotiator,
const char *algorithm);
#endif
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