1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
-- Copyright (c) 2010 by Robert G. Jakabosky <bobby@sharedrealm.com>
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.
c_source [[
//typedef struct RawObject RawObject;
#include <git2/odb_backend.h>
typedef struct DatabaseBackend {
git_odb_backend backend;
lua_State *L;
int read;
int read_header;
int write;
int exists;
int free;
int ref_count;
} DatabaseBackend;
static void DatabaseBackend_ref(DatabaseBackend *backend) {
backend->ref_count++;
}
static void DatabaseBackend_unref(DatabaseBackend *backend) {
lua_State *L = backend->L;
if((--backend->ref_count) == 0) {
luaL_unref(L, LUA_REGISTRYINDEX, backend->read);
luaL_unref(L, LUA_REGISTRYINDEX, backend->read_header);
luaL_unref(L, LUA_REGISTRYINDEX, backend->write);
luaL_unref(L, LUA_REGISTRYINDEX, backend->exists);
luaL_unref(L, LUA_REGISTRYINDEX, backend->free);
free(backend);
}
}
static int database_backend_read_cb(git_rawobj *obj, git_odb_backend *backend, const git_oid *oid)
{
DatabaseBackend *lua_backend = (DatabaseBackend *)backend;
lua_State *L = lua_backend->L;
int err;
/* get Lua callback function. */
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_backend->read);
obj_type_OID_push(L, *((OID *)oid), 0);
/* call Lua function. */
lua_call(L, 1, 2);
err = lua_tointeger(L, -1);
if(err == 0) {
RawObject *raw_obj = obj_type_RawObject_check(L,-2);
/* copy header fields. */
obj->len = raw_obj->git.len;
obj->type = raw_obj->git.type;
/* we must malloc & copy the RawObject's data. */
if(raw_obj->git.data) {
obj->data = malloc(obj->len);
if(obj->data == NULL) {
/* failed to allocate buffer. */
return GIT_ENOMEM;
}
/* copy data. */
memcpy(obj->data, raw_obj->git.data, obj->len);
} else {
obj->data = NULL;
}
}
return err;
}
static int database_backend_read_header_cb(git_rawobj *obj, git_odb_backend *backend, const git_oid *oid)
{
DatabaseBackend *lua_backend = (DatabaseBackend *)backend;
lua_State *L = lua_backend->L;
int err;
/* get Lua callback function. */
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_backend->read_header);
obj_type_OID_push(L, *((OID *)oid), 0);
/* call Lua function. */
lua_call(L, 1, 2);
err = lua_tointeger(L, -1);
if(err == 0) {
RawObject *raw_obj = obj_type_RawObject_check(L,-2);
/* copy only header fields. */
obj->data = NULL;
obj->len = raw_obj->git.len;
obj->type = raw_obj->git.type;
}
return err;
}
static int database_backend_write_cb(git_oid *oid, git_odb_backend *backend, git_rawobj *obj)
{
DatabaseBackend *lua_backend = (DatabaseBackend *)backend;
lua_State *L = lua_backend->L;
RawObject raw;
int err;
/* get Lua callback function. */
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_backend->write);
/* convert git_rawobj to RawObject */
RawObject_from_git_rawobj(L, &raw, obj, false);
/* push RawObject onto stack. */
obj_type_RawObject_push(L, &raw, 0);
/* call Lua function. */
lua_call(L, 1, 2);
err = lua_tointeger(L, -1);
if(err == 0) {
*oid = obj_type_OID_check(L,-2);
}
return err;
}
static int database_backend_exists_cb(git_odb_backend *backend, const git_oid *oid)
{
DatabaseBackend *lua_backend = (DatabaseBackend *)backend;
lua_State *L = lua_backend->L;
/* get Lua callback function. */
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_backend->exists);
obj_type_OID_push(L, *((OID *)oid), 0);
/* call Lua function. */
lua_call(L, 1, 1);
return lua_tointeger(L, -1);
}
static void database_backend_free_cb(git_odb_backend *backend)
{
DatabaseBackend *lua_backend = (DatabaseBackend *)backend;
lua_State *L = lua_backend->L;
/* get Lua callback function. */
lua_rawgeti(L, LUA_REGISTRYINDEX, lua_backend->free);
/* call Lua function. */
lua_call(L, 0, 0);
DatabaseBackend_unref(lua_backend);
}
]]
object "DatabaseBackend" {
constructor {
var_in{"lua_State *", "L"},
c_source [[
int idx;
int ref;
int priority = luaL_optinteger(L, 2, 0);
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 1);
/* create backend object. */
${this} = calloc(1, sizeof(DatabaseBackend));
${this}->ref_count = 1;
${this}->L = L;
/* get each callback from table. */
#define REF_CB(_name) \
lua_getfield(L, 1, "on_" #_name); \
${this}->_name = luaL_ref(L, LUA_REGISTRYINDEX); \
${this}->backend._name = database_backend_ ## _name ## _cb;
REF_CB(read)
REF_CB(read_header)
REF_CB(write)
REF_CB(exists)
REF_CB(free)
#undef REF_CB
${this}->backend.priority = priority;
]]
},
destructor {
c_source [[
DatabaseBackend_unref(${this});
]]
},
}
|
