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1#ifndef FETCH_NEGOTIATOR_H
2#define FETCH_NEGOTIATOR_H
3
4struct commit;
5struct repository;
6
7/*
8 * An object that supplies the information needed to negotiate the contents of
9 * the to-be-sent packfile during a fetch.
10 *
11 * To set up the negotiator, call fetch_negotiator_init(), then known_common()
12 * (0 or more times), then add_tip() (0 or more times).
13 *
14 * Then, when "have" lines are required, call next(). Call ack() to report what
15 * the server tells us.
16 *
17 * Once negotiation is done, call release(). The negotiator then cannot be used
18 * (unless reinitialized with fetch_negotiator_init()).
19 */
20struct fetch_negotiator {
21 /*
22 * Before negotiation starts, indicate that the server is known to have
23 * this commit.
24 */
25 void (*known_common)(struct fetch_negotiator *, struct commit *);
26
27 /*
28 * Once this function is invoked, known_common() cannot be invoked any
29 * more.
30 *
31 * Indicate that this commit and all its ancestors are to be checked
32 * for commonality with the server.
33 */
34 void (*add_tip)(struct fetch_negotiator *, struct commit *);
35
36 /*
37 * Once this function is invoked, known_common() and add_tip() cannot
38 * be invoked any more.
39 *
40 * Return the next commit that the client should send as a "have" line.
41 */
42 const struct object_id *(*next)(struct fetch_negotiator *);
43
44 /*
45 * Inform the negotiator that the server has the given commit. This
46 * method must only be called on commits returned by next().
47 */
48 int (*ack)(struct fetch_negotiator *, struct commit *);
49
50 void (*release)(struct fetch_negotiator *);
51
52 /* internal use */
53 void *data;
54};
55
56/*
57 * Initialize a negotiator based on the repository settings.
58 */
59void fetch_negotiator_init(struct repository *r,
60 struct fetch_negotiator *negotiator);
61
62/*
63 * Initialize a noop negotiator.
64 */
65void fetch_negotiator_init_noop(struct fetch_negotiator *negotiator);
66
67#endif