summaryrefslogtreecommitdiffstats
path: root/mod_glusterfs/apache/1.3/src/mod_glusterfs.c
blob: d097947189332fb93f0649d6a21b051e4f86e1f2 (plain)
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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
/*
  Copyright (c) 2008-2010 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/

#ifndef CORE_PRIVATE
#define CORE_PRIVATE
#endif

#include <httpd.h>
#include <http_config.h>
#include <http_core.h>
#include <http_request.h>
#include <http_protocol.h>
#include <http_log.h>
#include <http_main.h>
#include <util_script.h>
#include <libglusterfsclient.h>
#include <sys/uio.h>
#include <pthread.h>

#define GLUSTERFS_INVALID_LOGLEVEL "mod_glusterfs: Unrecognized log-level "\
                                   "\"%s\", possible values are \"DEBUG|"\
                                   "WARNING|ERROR|CRITICAL|NONE\"\n"

#define GLUSTERFS_HANDLER "glusterfs-handler"
#define GLUSTERFS_CHUNK_SIZE 131072 

module MODULE_VAR_EXPORT glusterfs_module;

/*TODO: verify error returns to server core */

typedef struct glusterfs_dir_config {
        char *logfile;
        char *loglevel;
        char *specfile;
        char *mount_dir;
        char *buf;
        size_t xattr_file_size;
        uint32_t cache_timeout;
} glusterfs_dir_config_t;

typedef struct glusterfs_async_local {
        int op_ret;
        int op_errno;
        char async_read_complete;
        off_t length;
        off_t read_bytes;
        glusterfs_iobuf_t *buf;
        request_rec *request;
        pthread_mutex_t lock;
        pthread_cond_t cond;
}glusterfs_async_local_t;

#define GLUSTERFS_CMD_PERMS ACCESS_CONF

static glusterfs_dir_config_t *
mod_glusterfs_dconfig(request_rec *r)
{
        glusterfs_dir_config_t *dir_config = NULL;
        if (r->per_dir_config != NULL) {
                dir_config = ap_get_module_config (r->per_dir_config,
                                                   &glusterfs_module);
        }

        return dir_config;
}

static 
const char *add_xattr_file_size(cmd_parms *cmd, void *dummy, char *arg)
{
        glusterfs_dir_config_t *dir_config = dummy;
        dir_config->xattr_file_size = atoi (arg);
        return NULL;
}

static
const char *set_cache_timeout(cmd_parms *cmd, void *dummy, char *arg)
{
        glusterfs_dir_config_t *dir_config = dummy;
        dir_config->cache_timeout = atoi (arg);
        return NULL;
}

static
const char *set_loglevel(cmd_parms *cmd, void *dummy, char *arg)
{
        glusterfs_dir_config_t *dir_config = dummy;
        char *error = NULL;
        if (strncasecmp (arg, "DEBUG", strlen ("DEBUG")) 
            && strncasecmp (arg, "WARNING", strlen ("WARNING")) 
            && strncasecmp (arg, "CRITICAL", strlen ("CRITICAL")) 
            && strncasecmp (arg, "NONE", strlen ("NONE")) 
            && strncasecmp (arg, "ERROR", strlen ("ERROR")))
                error = GLUSTERFS_INVALID_LOGLEVEL;
        else
                dir_config->loglevel = arg;

        return error;
}

static 
const char *add_logfile(cmd_parms *cmd, void *dummy, char *arg)
{
        glusterfs_dir_config_t *dir_config = dummy;
        dir_config->logfile = arg;

        return NULL;
}

static 
const char *add_specfile(cmd_parms *cmd, void *dummy, char *arg)
{
        glusterfs_dir_config_t *dir_config = dummy;

        dir_config->specfile = arg;

        return NULL;
}

static void *
mod_glusterfs_create_dir_config(pool *p, char *dirspec)
{
        glusterfs_dir_config_t *dir_config = NULL;

        dir_config = (glusterfs_dir_config_t *) ap_pcalloc(p,
                                                           sizeof(*dir_config));

        dir_config->mount_dir = dirspec;
        dir_config->logfile = dir_config->specfile = (char *)0;
        dir_config->loglevel = "warning";
        dir_config->cache_timeout = 0;
        dir_config->buf = NULL;

        return (void *) dir_config;
}

static void 
mod_glusterfs_child_init(server_rec *s, pool *p)
{
        void **urls = NULL;
        int n, i;
        core_server_config *mod_core_config = ap_get_module_config (s->module_config,
                                                                    &core_module);
        glusterfs_dir_config_t *dir_config = NULL;
        glusterfs_init_params_t params = {0, };
  
        n = mod_core_config->sec_url->nelts;
        urls = (void **)mod_core_config->sec_url->elts;
        for (i = 0; i < n; i++) {
                dir_config = ap_get_module_config (urls[i], &glusterfs_module);

                if (dir_config) {
                        memset (&params, 0, sizeof (params));

                        params.logfile = dir_config->logfile;
                        params.loglevel = dir_config->loglevel;
                        params.lookup_timeout = dir_config->cache_timeout;
                        params.stat_timeout = dir_config->cache_timeout;
                        params.specfile = dir_config->specfile;

                        glusterfs_mount (dir_config->mount_dir, &params);
                }
                dir_config = NULL;
        }
}

static void 
mod_glusterfs_child_exit(server_rec *s, pool *p)
{
        void **urls = NULL;
        int n, i;
        core_server_config *mod_core_config = NULL;
        glusterfs_dir_config_t *dir_config = NULL;
  
        mod_core_config = ap_get_module_config (s->module_config, &core_module);
        n = mod_core_config->sec_url->nelts;
        urls = (void **)mod_core_config->sec_url->elts;
        for (i = 0; i < n; i++) {
                dir_config = ap_get_module_config (urls[i], &glusterfs_module);
                if (dir_config) {
                        glusterfs_umount (dir_config->mount_dir);
                }
        }
}

static int mod_glusterfs_fixup(request_rec *r)
{
        glusterfs_dir_config_t *dir_config = NULL;
        int access_status;
        int ret;
        char *path = NULL;

        dir_config = mod_glusterfs_dconfig(r);

        if (dir_config && dir_config->mount_dir
            && !(strncmp (ap_pstrcat (r->pool, dir_config->mount_dir, "/",
                                      NULL),
                          r->uri, strlen (dir_config->mount_dir) + 1)
                 && !r->handler)) 
                r->handler = ap_pstrdup (r->pool, GLUSTERFS_HANDLER);

        if (!r->handler || (r->handler && strcmp (r->handler,
                                                  GLUSTERFS_HANDLER)))
                return DECLINED;

        path = r->uri;

        memset (&r->finfo, 0, sizeof (r->finfo));

        dir_config->buf = calloc (1, dir_config->xattr_file_size);
        if (!dir_config->buf) {
                return HTTP_INTERNAL_SERVER_ERROR;
        }

        ret = glusterfs_get (path, dir_config->buf, 
                             dir_config->xattr_file_size, &r->finfo);

        if (ret == -1 || r->finfo.st_size > dir_config->xattr_file_size
            || S_ISDIR (r->finfo.st_mode)) {
                free (dir_config->buf);
                dir_config->buf = NULL;

                if (ret == -1) {
                        int error = HTTP_NOT_FOUND;
                        char *emsg = NULL;
                        if (r->path_info == NULL) {
                                emsg = ap_pstrcat(r->pool, strerror (errno),
                                                  r->filename, NULL);
                        }
                        else {
                                emsg = ap_pstrcat(r->pool, strerror (errno),
                                                  r->filename, r->path_info,
                                                  NULL);
                        }
                        ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, r,
                                      "%s", emsg);
                        if (errno != ENOENT) {
                                error = HTTP_INTERNAL_SERVER_ERROR;
                        }
                        return error;
                }
        }
    
        if (r->uri && strlen (r->uri) && r->uri[strlen(r->uri) - 1] == '/') 
                r->handler = NULL;

        r->filename = ap_pstrcat (r->pool, r->filename, r->path_info, NULL);

        if ((access_status = ap_find_types(r)) != 0) {
                return DECLINED;
        }

        return OK;
}


int 
mod_glusterfs_readv_async_cbk (int32_t op_ret, int32_t op_errno,
                               glusterfs_iobuf_t *buf, void *cbk_data)
{
        glusterfs_async_local_t *local = cbk_data;

        pthread_mutex_lock (&local->lock);
        {
                local->async_read_complete = 1;
                local->buf = buf;
                local->op_ret = op_ret;
                local->op_errno = op_errno;
                pthread_cond_signal (&local->cond);
        }
        pthread_mutex_unlock (&local->lock);

        return 0;
}

/* use read_async just to avoid memcpy of read buffer in libglusterfsclient */
static int
mod_glusterfs_read_async (request_rec *r, glusterfs_file_t fd, off_t offset,
                          off_t length)
{
        glusterfs_async_local_t local;
        off_t end;
        int nbytes;
        int complete;
        pthread_cond_init (&local.cond, NULL);
        pthread_mutex_init (&local.lock, NULL);
  
        memset (&local, 0, sizeof (local));
        local.request = r;

        if (length > 0)
                end = offset + length;

        do {
                glusterfs_iobuf_t *buf;
                int i;
                if (length > 0) {
                        nbytes = end - offset;
                        if (nbytes > GLUSTERFS_CHUNK_SIZE)
                                nbytes = GLUSTERFS_CHUNK_SIZE;
                } else
                        nbytes = GLUSTERFS_CHUNK_SIZE;

                glusterfs_read_async(fd, 
                                     nbytes,
                                     offset,
                                     mod_glusterfs_readv_async_cbk,
                                     (void *)&local);

                pthread_mutex_lock (&local.lock);
                {
                        while (!local.async_read_complete) {
                                pthread_cond_wait (&local.cond, &local.lock);
                        }

                        local.async_read_complete = 0;
                        buf = local.buf;

                        if (length < 0)
                                complete = (local.op_ret <= 0);
                        else {
                                local.read_bytes += local.op_ret;
                                complete = ((local.read_bytes == length) 
                                            || (local.op_ret < 0));
                        }
                }
                pthread_mutex_unlock (&local.lock);

                for (i = 0; i < buf->count; i++) {
                        if (ap_rwrite (buf->vector[i].iov_base,
                                       buf->vector[i].iov_len, r) < 0) {
                                local.op_ret = -1;
                                complete = 1;
                                break;
                        }
                }      

                glusterfs_free (buf);

                offset += nbytes;
        } while (!complete);

        return (local.op_ret < 0 ? SERVER_ERROR : OK);
}

static int 
mod_glusterfs_handler(request_rec *r)
{
        glusterfs_dir_config_t *dir_config;
        char *path = NULL;
        int error = OK;
        int rangestatus = 0;
        int errstatus = OK;
        glusterfs_file_t fd;
  
        if (!r->handler || (r->handler && strcmp (r->handler,
                                                  GLUSTERFS_HANDLER)))
                return DECLINED;

        if (r->uri[0] == '\0' || r->uri[strlen(r->uri) - 1] == '/') {
                return DECLINED;
        }
  
        dir_config = mod_glusterfs_dconfig (r);
  
        if (r->method_number != M_GET) {
                return METHOD_NOT_ALLOWED;
        }

        ap_update_mtime(r, r->finfo.st_mtime);
        ap_set_last_modified(r);
        ap_set_etag(r);
        ap_table_setn(r->headers_out, "Accept-Ranges", "bytes");
        if (((errstatus = ap_meets_conditions(r)) != OK)
            || (errstatus = ap_set_content_length(r, r->finfo.st_size))) {
                return errstatus;
        }
        rangestatus =  ap_set_byterange(r);
        ap_send_http_header(r);

        if (r->finfo.st_size <= dir_config->xattr_file_size && dir_config->buf) {
                if (!r->header_only) {
                        error = OK;
                        ap_log_rerror (APLOG_MARK, APLOG_NOTICE, r, 
                                       "fetching data from glusterfs through "
                                       "xattr interface\n");
      
                        if (!rangestatus) {
                                if (ap_rwrite (dir_config->buf,
                                               r->finfo.st_size, r) < 0) {
                                        error = HTTP_INTERNAL_SERVER_ERROR;
                                }
                        } else {
                                long offset, length;
                                while (ap_each_byterange (r, &offset, &length)) {
                                        if (ap_rwrite (dir_config->buf + offset,
                                                       length, r) < 0) {
                                                error = HTTP_INTERNAL_SERVER_ERROR;
                                                break;
                                        }
                                }
                        }
                }

                free (dir_config->buf);
                dir_config->buf = NULL;

                return error;
        }

        path = r->uri;
        fd = glusterfs_open (path , O_RDONLY, 0);
  
        if (fd == 0) {
                ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
                              "file permissions deny server access: %s",
                              r->filename);
                return FORBIDDEN;
        }
  
        if (!r->header_only) {
                if (!rangestatus) {
                        mod_glusterfs_read_async (r, fd, 0, -1);
                } else {
                        long offset, length;
                        while (ap_each_byterange(r, &offset, &length)) {
                                mod_glusterfs_read_async (r, fd, offset, length);
                        }
                }
        }
  
        glusterfs_close (fd);
        return error;
}

static const command_rec mod_glusterfs_cmds[] =
{
        {"GlusterfsLogfile", add_logfile, NULL,
         GLUSTERFS_CMD_PERMS, TAKE1,
         "Glusterfs Logfile"},
        {"GlusterfsLoglevel", set_loglevel, NULL,
         GLUSTERFS_CMD_PERMS, TAKE1,
         "Glusterfs Loglevel:anyone of none, critical, error, warning, debug"},
        {"GlusterfsCacheTimeout", set_cache_timeout, NULL,
         GLUSTERFS_CMD_PERMS, TAKE1,
         "Timeout value in seconds for caching lookups and stats"},
        {"GlusterfsVolumeSpecfile", add_specfile, NULL,
         GLUSTERFS_CMD_PERMS, TAKE1,
         "Glusterfs Specfile required to access contents of this directory"},
        {"GlusterfsXattrFileSize", add_xattr_file_size, NULL, 
         GLUSTERFS_CMD_PERMS, TAKE1,
         "Maximum size of the file to be fetched using xattr interface of "
         "glusterfs"},
        {NULL}
};

static const handler_rec mod_glusterfs_handlers[] =
{
        {GLUSTERFS_HANDLER, mod_glusterfs_handler},
        {NULL}
};

module glusterfs_module =
{
        STANDARD_MODULE_STUFF,
        NULL, 
        mod_glusterfs_create_dir_config,  /* per-directory config creator */
        NULL,
        NULL,       /* server config creator */
        NULL,        /* server config merger */
        mod_glusterfs_cmds,               /* command table */
        mod_glusterfs_handlers,           /* [7] list of handlers */
        NULL,  /* [2] filename-to-URI translation */
        NULL,      /* [5] check/validate user_id */
        NULL,       /* [6] check user_id is valid *here* */
        NULL,     /* [4] check access by host address */
        NULL,       /* [7] MIME type checker/setter */
        mod_glusterfs_fixup,        /* [8] fixups */
        NULL,             /* [10] logger */
#if MODULE_MAGIC_NUMBER >= 19970103
        NULL,      /* [3] header parser */
#endif
#if MODULE_MAGIC_NUMBER >= 19970719
        mod_glusterfs_child_init,         /* process initializer */
#endif
#if MODULE_MAGIC_NUMBER >= 19970728
        mod_glusterfs_child_exit,         /* process exit/cleanup */
#endif
#if MODULE_MAGIC_NUMBER >= 19970902
        NULL   /* [1] post read_request handling */
#endif
};