1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define GOT_PACKIDX_CACHE_SIZE	64
18 #define GOT_PACK_CACHE_SIZE	GOT_PACKIDX_CACHE_SIZE
19 
20 #define GOT_OBJECT_CACHE_SIZE_OBJ	1024
21 #define GOT_OBJECT_CACHE_SIZE_TREE	128
22 #define GOT_OBJECT_CACHE_SIZE_COMMIT	512
23 
24 enum got_object_chache_type {
25 	GOT_OBJECT_CACHE_TYPE_OBJ,
26 	GOT_OBJECT_CACHE_TYPE_TREE,
27 	GOT_OBJECT_CACHE_TYPE_COMMIT,
28 };
29 
30 struct got_object_cache_entry {
31 	struct got_object_id id;
32 	union {
33 		struct got_object *obj;
34 		struct got_tree_object *tree;
35 		struct got_commit_object *commit;
36 	} data;
37 };
38 
39 struct got_object_cache {
40 	enum got_object_chache_type type;
41 	struct got_object_idcache *idcache;
42 	size_t size;
43 	int cache_hit;
44 	int cache_miss;
45 };
46 
47 struct got_privsep_child {
48 	int imsg_fd;
49 	pid_t pid;
50 };
51 
52 struct got_repository {
53 	char *path;
54 	char *path_git_dir;
55 
56 	/* The pack index cache speeds up search for packed objects. */
57 	struct got_packidx *packidx_cache[GOT_PACKIDX_CACHE_SIZE];
58 
59 	/* Open file handles for pack files. */
60 	struct got_pack packs[GOT_PACK_CACHE_SIZE];
61 
62 	/* Handles to child processes for reading pack files. */
63 	struct got_privsep_child pack_privsep_children[GOT_PACK_CACHE_SIZE];
64 
65 	/* Handles to child processes for reading loose objects. */
66 	 struct got_privsep_child privsep_children[4];
67 #define GOT_REPO_PRIVSEP_CHILD_OBJECT	0
68 #define GOT_REPO_PRIVSEP_CHILD_COMMIT	1
69 #define GOT_REPO_PRIVSEP_CHILD_TREE	2
70 #define GOT_REPO_PRIVSEP_CHILD_BLOB	3
71 
72 	/* Caches for open objects. */
73 	struct got_object_cache objcache;
74 	struct got_object_cache treecache;
75 	struct got_object_cache commitcache;
76 };
77 
78 const struct got_error*got_repo_cache_object(struct got_repository *,
79     struct got_object_id *, struct got_object *);
80 struct got_object *got_repo_get_cached_object(struct got_repository *,
81     struct got_object_id *);
82 const struct got_error*got_repo_cache_tree(struct got_repository *,
83     struct got_object_id *, struct got_tree_object *);
84 struct got_tree_object *got_repo_get_cached_tree(struct got_repository *,
85     struct got_object_id *);
86 const struct got_error*got_repo_cache_commit(struct got_repository *,
87     struct got_object_id *, struct got_commit_object *);
88 struct got_commit_object *got_repo_get_cached_commit(struct got_repository *,
89     struct got_object_id *);