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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
This file is part of GNUnet.
Copyright (C) 2003, 2004, 2006, 2009 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
*/
/**
* @file fs/fs_list_indexed.c
* @author Christian Grothoff
* @brief provide a list of all indexed files
*/
#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "gnunet_protocols.h"
#include "fs_api.h"
/**
* Context for #GNUNET_FS_get_indexed_files().
*/
struct GNUNET_FS_GetIndexedContext
{
/**
* Connection to the FS service.
*/
struct GNUNET_MQ_Handle *mq;
/**
* Function to call for each indexed file.
*/
GNUNET_FS_IndexedFileProcessor iterator;
/**
* Closure for @e iterator.
*/
void *iterator_cls;
/**
* Continuation to trigger at the end.
*/
GNUNET_SCHEDULER_TaskCallback cont;
/**
* Closure for @e cont.
*/
void *cont_cls;
};
/**
* Function called on each response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param msg message with indexing information
*/
static void
handle_index_info_end (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
(void) gic->iterator (gic->iterator_cls,
NULL,
NULL);
GNUNET_FS_get_indexed_files_cancel (gic);
}
/**
* Check validity of response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param iim message with indexing information
*/
static int
check_index_info (void *cls,
const struct IndexInfoMessage *iim)
{
uint16_t msize = ntohs (iim->header.size) - sizeof (*iim);
const char *filename;
filename = (const char *) &iim[1];
if (filename[msize - 1] != '\0')
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function called on each response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param iim message with indexing information
*/
static void
handle_index_info (void *cls,
const struct IndexInfoMessage *iim)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
const char *filename;
filename = (const char *) &iim[1];
if (GNUNET_OK !=
gic->iterator (gic->iterator_cls,
filename,
&iim->file_id))
{
GNUNET_FS_get_indexed_files_cancel (gic);
return;
}
}
/**
* Generic error handler, called with the appropriate error code and
* the same closure specified at the creation of the message queue.
* Not every message queue implementation supports an error handler.
*
* @param cls closure with the `struct GNUNET_FS_GetIndexedContent *`
* @param error error code
*/
static void
mq_error_handler (void *cls,
enum GNUNET_MQ_Error error)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to receive response from `%s' service.\n"),
"fs");
(void) gic->iterator (gic->iterator_cls, NULL, NULL);
GNUNET_FS_get_indexed_files_cancel (gic);
}
/**
* Iterate over all indexed files.
*
* @param h handle to the file sharing subsystem
* @param iterator function to call on each indexed file
* @param iterator_cls closure for iterator
* @return NULL on error ('iter' is not called)
*/
struct GNUNET_FS_GetIndexedContext *
GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
GNUNET_FS_IndexedFileProcessor iterator,
void *iterator_cls)
{
struct GNUNET_FS_GetIndexedContext *gic
= GNUNET_new (struct GNUNET_FS_GetIndexedContext);
struct GNUNET_MQ_MessageHandler handlers[] = {
GNUNET_MQ_hd_fixed_size (index_info_end,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END,
struct GNUNET_MessageHeader,
gic),
GNUNET_MQ_hd_var_size (index_info,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY,
struct IndexInfoMessage,
gic),
GNUNET_MQ_handler_end ()
};
struct GNUNET_MQ_Envelope *env;
struct GNUNET_MessageHeader *msg;
gic->mq = GNUNET_CLIENT_connect (h->cfg,
"fs",
handlers,
&mq_error_handler,
h);
if (NULL == gic->mq)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to not connect to `%s' service.\n"),
"fs");
GNUNET_free (gic);
return NULL;
}
gic->iterator = iterator;
gic->iterator_cls = iterator_cls;
env = GNUNET_MQ_msg (msg,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET);
GNUNET_MQ_send (gic->mq,
env);
return gic;
}
/**
* Cancel iteration over all indexed files.
*
* @param gic operation to cancel
*/
void
GNUNET_FS_get_indexed_files_cancel (struct GNUNET_FS_GetIndexedContext *gic)
{
GNUNET_MQ_destroy (gic->mq);
GNUNET_free (gic);
}
/* end of fs_list_indexed.c */
|
