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
|
/*-
* Copyright (c) 2010-2011 Varnish Software AS
* All rights reserved.
*
* Author: Sanjoy Das <sanjoy@playingwithpointers.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* XXX: It might make sense to use just a single global list of all files
* XXX: and use the call-private pointer to point to the file instance on
* XXX: that list.
* XXX: Duplicates in the global list can be avoided by examining the
* XXX: dev+inode fields of the stat structure.
* XXX: Individual files would need to be refcounted, so they can be
* XXX: deleted when no VCL's reference them.
*
* XXX: We should periodically stat(2) the filename and check if the
* XXX: underlying file has been updated.
*/
#include "config.h"
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include "cache/cache.h"
#include "vrt.h"
#include "vfil.h"
#include "vcc_if.h"
struct frfile {
unsigned magic;
#define CACHED_FILE_MAGIC 0xa8e9d87a
char *file_name;
char *contents;
int refcount;
VTAILQ_ENTRY(frfile) list;
};
static VTAILQ_HEAD(, frfile) frlist = VTAILQ_HEAD_INITIALIZER(frlist);
static pthread_mutex_t frmtx = PTHREAD_MUTEX_INITIALIZER;
static void
free_frfile(void *ptr)
{
struct frfile *frf;
CAST_OBJ_NOTNULL(frf, ptr, CACHED_FILE_MAGIC);
AZ(pthread_mutex_lock(&frmtx));
if (--frf->refcount > 0)
frf = NULL;
else
VTAILQ_REMOVE(&frlist, frf, list);
AZ(pthread_mutex_unlock(&frmtx));
if (frf != NULL) {
free(frf->contents);
free(frf->file_name);
FREE_OBJ(frf);
}
}
VCL_STRING __match_proto__(td_std_fileread)
vmod_fileread(const struct vrt_ctx *ctx, struct vmod_priv *priv,
VCL_STRING file_name)
{
struct frfile *frf = NULL;
char *s;
CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
AN(priv);
if (priv->priv != NULL) {
CAST_OBJ_NOTNULL(frf, priv->priv, CACHED_FILE_MAGIC);
if (!strcmp(file_name, frf->file_name))
return (frf->contents);
}
AZ(pthread_mutex_lock(&frmtx));
if (frf != NULL)
frf->refcount--;
VTAILQ_FOREACH(frf, &frlist, list) {
if (!strcmp(file_name, frf->file_name)) {
frf->refcount++;
break;
}
}
AZ(pthread_mutex_unlock(&frmtx));
if (frf != NULL) {
priv->free = free_frfile;
priv->priv = frf;
return (frf->contents);
}
s = VFIL_readfile(NULL, file_name, NULL);
if (s != NULL) {
ALLOC_OBJ(frf, CACHED_FILE_MAGIC);
AN(frf);
frf->file_name = strdup(file_name);
AN(frf->file_name);
frf->refcount = 1;
frf->contents = s;
priv->free = free_frfile;
priv->priv = frf;
AZ(pthread_mutex_lock(&frmtx));
VTAILQ_INSERT_HEAD(&frlist, frf, list);
AZ(pthread_mutex_unlock(&frmtx));
}
return (s);
}
|
