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9f9daf9a LC |
1 | /* |
2 | * QError: QEMU Error data-type. | |
3 | * | |
4 | * Copyright (C) 2009 Red Hat Inc. | |
5 | * | |
6 | * Authors: | |
7 | * Luiz Capitulino <lcapitulino@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. | |
10 | * See the COPYING.LIB file in the top-level directory. | |
11 | */ | |
12 | #include "qjson.h" | |
13 | #include "qerror.h" | |
14 | #include "qstring.h" | |
15 | #include "sysemu.h" | |
16 | #include "qemu-common.h" | |
17 | ||
18 | static void qerror_destroy_obj(QObject *obj); | |
19 | ||
20 | static const QType qerror_type = { | |
21 | .code = QTYPE_QERROR, | |
22 | .destroy = qerror_destroy_obj, | |
23 | }; | |
24 | ||
25 | /** | |
26 | * The 'desc' parameter is a printf-like string, the format of the format | |
27 | * string is: | |
28 | * | |
29 | * %(KEY) | |
30 | * | |
31 | * Where KEY is a QDict key, which has to be passed to qerror_from_info(). | |
32 | * | |
33 | * Example: | |
34 | * | |
35 | * "foo error on device: %(device) slot: %(slot_nr)" | |
36 | * | |
37 | * A single percent sign can be printed if followed by a second one, | |
38 | * for example: | |
39 | * | |
40 | * "running out of foo: %(foo)%%" | |
41 | */ | |
d05ac8fa | 42 | static const QErrorStringTable qerror_table[] = { |
4b9d4683 | 43 | { |
e16a1812 MA |
44 | .error_fmt = QERR_COMMAND_NOT_FOUND, |
45 | .desc = "The command %(name) has not been found", | |
4b9d4683 | 46 | }, |
0df37c41 LC |
47 | { |
48 | .error_fmt = QERR_DEVICE_ENCRYPTED, | |
49 | .desc = "The %(device) is encrypted", | |
50 | }, | |
e16a1812 MA |
51 | { |
52 | .error_fmt = QERR_DEVICE_NOT_ACTIVE, | |
53 | .desc = "The %(device) device has not been activated by the guest", | |
54 | }, | |
357b6156 LC |
55 | { |
56 | .error_fmt = QERR_DEVICE_NOT_FOUND, | |
57 | .desc = "The %(device) device has not been found", | |
58 | }, | |
055f6122 | 59 | { |
e16a1812 MA |
60 | .error_fmt = QERR_INVALID_PARAMETER_TYPE, |
61 | .desc = "Invalid parameter type, expected: %(expected)", | |
055f6122 | 62 | }, |
4b9d4683 | 63 | { |
e16a1812 MA |
64 | .error_fmt = QERR_INVALID_PASSWORD, |
65 | .desc = "The entered password is invalid", | |
4b9d4683 | 66 | }, |
f6d855c5 | 67 | { |
e16a1812 MA |
68 | .error_fmt = QERR_JSON_PARSING, |
69 | .desc = "Invalid JSON syntax", | |
f6d855c5 | 70 | }, |
82a60711 LC |
71 | { |
72 | .error_fmt = QERR_KVM_MISSING_CAP, | |
73 | .desc = "Using KVM without %(capability), %(feature) unavailable", | |
74 | }, | |
4b9d4683 LC |
75 | { |
76 | .error_fmt = QERR_MISSING_PARAMETER, | |
77 | .desc = "Parameter %(name) is missing", | |
78 | }, | |
79 | { | |
80 | .error_fmt = QERR_QMP_BAD_INPUT_OBJECT, | |
81 | .desc = "Bad QMP input object", | |
82 | }, | |
83 | { | |
e16a1812 MA |
84 | .error_fmt = QERR_UNDEFINED_ERROR, |
85 | .desc = "An undefined error has ocurred", | |
4b9d4683 | 86 | }, |
9f9daf9a LC |
87 | {} |
88 | }; | |
89 | ||
90 | /** | |
91 | * qerror_new(): Create a new QError | |
92 | * | |
93 | * Return strong reference. | |
94 | */ | |
95 | QError *qerror_new(void) | |
96 | { | |
97 | QError *qerr; | |
98 | ||
99 | qerr = qemu_mallocz(sizeof(*qerr)); | |
100 | QOBJECT_INIT(qerr, &qerror_type); | |
101 | ||
102 | return qerr; | |
103 | } | |
104 | ||
105 | static void qerror_abort(const QError *qerr, const char *fmt, ...) | |
106 | { | |
107 | va_list ap; | |
108 | ||
109 | fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func); | |
110 | fprintf(stderr, "qerror: -> "); | |
111 | ||
112 | va_start(ap, fmt); | |
113 | vfprintf(stderr, fmt, ap); | |
114 | va_end(ap); | |
115 | ||
116 | fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr); | |
117 | abort(); | |
118 | } | |
119 | ||
120 | static void qerror_set_data(QError *qerr, const char *fmt, va_list *va) | |
121 | { | |
122 | QObject *obj; | |
123 | ||
124 | obj = qobject_from_jsonv(fmt, va); | |
125 | if (!obj) { | |
126 | qerror_abort(qerr, "invalid format '%s'", fmt); | |
127 | } | |
128 | if (qobject_type(obj) != QTYPE_QDICT) { | |
129 | qerror_abort(qerr, "error format is not a QDict '%s'", fmt); | |
130 | } | |
131 | ||
132 | qerr->error = qobject_to_qdict(obj); | |
133 | ||
134 | obj = qdict_get(qerr->error, "class"); | |
135 | if (!obj) { | |
136 | qerror_abort(qerr, "missing 'class' key in '%s'", fmt); | |
137 | } | |
138 | if (qobject_type(obj) != QTYPE_QSTRING) { | |
139 | qerror_abort(qerr, "'class' key value should be a QString"); | |
140 | } | |
141 | ||
142 | obj = qdict_get(qerr->error, "data"); | |
143 | if (!obj) { | |
144 | qerror_abort(qerr, "missing 'data' key in '%s'", fmt); | |
145 | } | |
146 | if (qobject_type(obj) != QTYPE_QDICT) { | |
147 | qerror_abort(qerr, "'data' key value should be a QDICT"); | |
148 | } | |
149 | } | |
150 | ||
151 | static void qerror_set_desc(QError *qerr, const char *fmt) | |
152 | { | |
153 | int i; | |
154 | ||
155 | // FIXME: inefficient loop | |
156 | ||
157 | for (i = 0; qerror_table[i].error_fmt; i++) { | |
158 | if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { | |
159 | qerr->entry = &qerror_table[i]; | |
160 | return; | |
161 | } | |
162 | } | |
163 | ||
164 | qerror_abort(qerr, "error format '%s' not found", fmt); | |
165 | } | |
166 | ||
167 | /** | |
168 | * qerror_from_info(): Create a new QError from error information | |
169 | * | |
170 | * The information consists of: | |
171 | * | |
172 | * - file the file name of where the error occurred | |
173 | * - linenr the line number of where the error occurred | |
174 | * - func the function name of where the error occurred | |
175 | * - fmt JSON printf-like dictionary, there must exist keys 'class' and | |
176 | * 'data' | |
177 | * - va va_list of all arguments specified by fmt | |
178 | * | |
179 | * Return strong reference. | |
180 | */ | |
181 | QError *qerror_from_info(const char *file, int linenr, const char *func, | |
182 | const char *fmt, va_list *va) | |
183 | { | |
184 | QError *qerr; | |
185 | ||
186 | qerr = qerror_new(); | |
187 | qerr->linenr = linenr; | |
188 | qerr->file = file; | |
189 | qerr->func = func; | |
190 | ||
191 | if (!fmt) { | |
192 | qerror_abort(qerr, "QDict not specified"); | |
193 | } | |
194 | ||
195 | qerror_set_data(qerr, fmt, va); | |
196 | qerror_set_desc(qerr, fmt); | |
197 | ||
198 | return qerr; | |
199 | } | |
200 | ||
201 | static void parse_error(const QError *qerror, int c) | |
202 | { | |
203 | qerror_abort(qerror, "expected '%c' in '%s'", c, qerror->entry->desc); | |
204 | } | |
205 | ||
206 | static const char *append_field(QString *outstr, const QError *qerror, | |
207 | const char *start) | |
208 | { | |
209 | QObject *obj; | |
210 | QDict *qdict; | |
211 | QString *key_qs; | |
212 | const char *end, *key; | |
213 | ||
214 | if (*start != '%') | |
215 | parse_error(qerror, '%'); | |
216 | start++; | |
217 | if (*start != '(') | |
218 | parse_error(qerror, '('); | |
219 | start++; | |
220 | ||
221 | end = strchr(start, ')'); | |
222 | if (!end) | |
223 | parse_error(qerror, ')'); | |
224 | ||
225 | key_qs = qstring_from_substr(start, 0, end - start - 1); | |
226 | key = qstring_get_str(key_qs); | |
227 | ||
228 | qdict = qobject_to_qdict(qdict_get(qerror->error, "data")); | |
229 | obj = qdict_get(qdict, key); | |
230 | if (!obj) { | |
231 | qerror_abort(qerror, "key '%s' not found in QDict", key); | |
232 | } | |
233 | ||
234 | switch (qobject_type(obj)) { | |
235 | case QTYPE_QSTRING: | |
236 | qstring_append(outstr, qdict_get_str(qdict, key)); | |
237 | break; | |
238 | case QTYPE_QINT: | |
239 | qstring_append_int(outstr, qdict_get_int(qdict, key)); | |
240 | break; | |
241 | default: | |
242 | qerror_abort(qerror, "invalid type '%c'", qobject_type(obj)); | |
243 | } | |
244 | ||
245 | QDECREF(key_qs); | |
246 | return ++end; | |
247 | } | |
248 | ||
249 | /** | |
250 | * qerror_print(): Print QError data | |
251 | * | |
252 | * This function will print the member 'desc' of the specified QError object, | |
253 | * it uses qemu_error() for this, so that the output is routed to the right | |
254 | * place (ie. stderr or Monitor's device). | |
255 | */ | |
256 | void qerror_print(const QError *qerror) | |
257 | { | |
258 | const char *p; | |
259 | QString *qstring; | |
260 | ||
261 | assert(qerror->entry != NULL); | |
262 | ||
263 | qstring = qstring_new(); | |
264 | ||
265 | for (p = qerror->entry->desc; *p != '\0';) { | |
266 | if (*p != '%') { | |
267 | qstring_append_chr(qstring, *p++); | |
268 | } else if (*(p + 1) == '%') { | |
269 | qstring_append_chr(qstring, '%'); | |
270 | p += 2; | |
271 | } else { | |
272 | p = append_field(qstring, qerror, p); | |
273 | } | |
274 | } | |
275 | ||
276 | qemu_error("%s\n", qstring_get_str(qstring)); | |
277 | QDECREF(qstring); | |
278 | } | |
279 | ||
280 | /** | |
281 | * qobject_to_qerror(): Convert a QObject into a QError | |
282 | */ | |
283 | QError *qobject_to_qerror(const QObject *obj) | |
284 | { | |
285 | if (qobject_type(obj) != QTYPE_QERROR) { | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | return container_of(obj, QError, base); | |
290 | } | |
291 | ||
292 | /** | |
293 | * qerror_destroy_obj(): Free all memory allocated by a QError | |
294 | */ | |
295 | static void qerror_destroy_obj(QObject *obj) | |
296 | { | |
297 | QError *qerr; | |
298 | ||
299 | assert(obj != NULL); | |
300 | qerr = qobject_to_qerror(obj); | |
301 | ||
302 | QDECREF(qerr->error); | |
303 | qemu_free(qerr); | |
304 | } |