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
|
/*
* Copyright (c) 2024 Attila Szakacs
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "filterx-cache-json-file.h"
#include "filterx/object-json.h"
#include "filterx/object-string.h"
#include "filterx/expr-literal.h"
#include "filterx/filterx-eval.h"
#include "scratch-buffers.h"
#include "compat/json.h"
#include <stdio.h>
#include <errno.h>
#define FILTERX_FUNC_CACHE_JSON_FILE_USAGE "Usage: cache_json_file(\"/path/to/file.json\")"
#define CACHE_JSON_FILE_ERROR cache_json_file_error_quark()
enum FilterXFunctionCacheJsonFileError
{
CACHE_JSON_FILE_ERROR_FILE_OPEN_ERROR,
CACHE_JSON_FILE_ERROR_FILE_READ_ERROR,
CACHE_JSON_FILE_ERROR_JSON_PARSE_ERROR,
};
static GQuark
cache_json_file_error_quark(void)
{
return g_quark_from_static_string("filterx-function-cache-json-file-error-quark");
}
typedef struct FilterXFunctionCacheJsonFile_
{
FilterXFunction super;
gchar *filepath;
FilterXObject *cached_json;
} FilterXFuntionCacheJsonFile;
static gchar *
_extract_filepath(FilterXFunctionArgs *args, GError **error)
{
if (filterx_function_args_len(args) != 1)
{
g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
"invalid number of arguments. " FILTERX_FUNC_CACHE_JSON_FILE_USAGE);
return NULL;
}
gsize filepath_len;
const gchar *filepath = filterx_function_args_get_literal_string(args, 0, &filepath_len);
if (!filepath)
{
g_set_error(error, FILTERX_FUNCTION_ERROR, FILTERX_FUNCTION_ERROR_CTOR_FAIL,
"argument must be string literal. " FILTERX_FUNC_CACHE_JSON_FILE_USAGE);
return NULL;
}
return g_strdup(filepath);
}
static FilterXObject *
_load_json_file(const gchar *filepath, GError **error)
{
FILE *file = fopen(filepath, "rb");
if (!file)
{
g_set_error(error, CACHE_JSON_FILE_ERROR, CACHE_JSON_FILE_ERROR_FILE_OPEN_ERROR,
"failed to open file: %s (%s)", filepath, g_strerror(errno));
return FALSE;
}
struct json_tokener *tokener = json_tokener_new();
struct json_object *object = NULL;
gchar buffer[1024];
while (TRUE)
{
gsize bytes_read = fread(buffer, 1, sizeof(buffer), file);
if (bytes_read <= 0)
{
if (ferror(file))
g_set_error(error, CACHE_JSON_FILE_ERROR, CACHE_JSON_FILE_ERROR_FILE_READ_ERROR,
"failed to read file: %s (%s)", filepath, g_strerror(errno));
break;
}
object = json_tokener_parse_ex(tokener, buffer, bytes_read);
enum json_tokener_error parse_result = json_tokener_get_error(tokener);
if (parse_result == json_tokener_success)
break;
if (parse_result == json_tokener_continue)
continue;
g_set_error(error, CACHE_JSON_FILE_ERROR, CACHE_JSON_FILE_ERROR_JSON_PARSE_ERROR,
"failed to parse JSON file: %s (%s)", filepath, json_tokener_error_desc(parse_result));
break;
}
FilterXObject *result = NULL;
if (object)
{
result = filterx_json_new_from_object(object);
filterx_object_make_readonly(result);
}
json_tokener_free(tokener);
fclose(file);
return result;
}
static FilterXObject *
_eval(FilterXExpr *s)
{
FilterXFuntionCacheJsonFile *self = (FilterXFuntionCacheJsonFile *) s;
return filterx_object_ref(self->cached_json);
}
static void
_free(FilterXExpr *s)
{
FilterXFuntionCacheJsonFile *self = (FilterXFuntionCacheJsonFile *) s;
g_free(self->filepath);
if (self->cached_json)
filterx_object_unfreeze_and_free(self->cached_json);
filterx_function_free_method(&self->super);
}
FilterXFunction *
filterx_function_cache_json_file_new(const gchar *function_name, FilterXFunctionArgs *args, GError **error)
{
FilterXFuntionCacheJsonFile *self = g_new0(FilterXFuntionCacheJsonFile, 1);
filterx_function_init_instance(&self->super, function_name);
self->super.super.eval = _eval;
self->super.super.free_fn = _free;
self->filepath = _extract_filepath(args, error);
if (!self->filepath)
goto error;
self->cached_json = _load_json_file(self->filepath, error);
if (!self->cached_json)
goto error;
filterx_object_freeze(self->cached_json);
filterx_function_args_free(args);
return &self->super;
error:
filterx_function_args_free(args);
filterx_expr_unref(&self->super.super);
return NULL;
}
gpointer
filterx_function_cache_json_file_new_construct(Plugin *self)
{
return (gpointer) &filterx_function_cache_json_file_new;
}
|
