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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 | }, | |
b0868380 MA |
51 | { |
52 | .error_fmt = QERR_DEVICE_LOCKED, | |
53 | .desc = "Device %(device) is locked", | |
54 | }, | |
e16a1812 MA |
55 | { |
56 | .error_fmt = QERR_DEVICE_NOT_ACTIVE, | |
57 | .desc = "The %(device) device has not been activated by the guest", | |
58 | }, | |
357b6156 LC |
59 | { |
60 | .error_fmt = QERR_DEVICE_NOT_FOUND, | |
61 | .desc = "The %(device) device has not been found", | |
62 | }, | |
055f6122 | 63 | { |
e16a1812 MA |
64 | .error_fmt = QERR_INVALID_PARAMETER_TYPE, |
65 | .desc = "Invalid parameter type, expected: %(expected)", | |
055f6122 | 66 | }, |
4b9d4683 | 67 | { |
e16a1812 MA |
68 | .error_fmt = QERR_INVALID_PASSWORD, |
69 | .desc = "The entered password is invalid", | |
4b9d4683 | 70 | }, |
f6d855c5 | 71 | { |
e16a1812 MA |
72 | .error_fmt = QERR_JSON_PARSING, |
73 | .desc = "Invalid JSON syntax", | |
f6d855c5 | 74 | }, |
82a60711 LC |
75 | { |
76 | .error_fmt = QERR_KVM_MISSING_CAP, | |
77 | .desc = "Using KVM without %(capability), %(feature) unavailable", | |
78 | }, | |
4b9d4683 LC |
79 | { |
80 | .error_fmt = QERR_MISSING_PARAMETER, | |
81 | .desc = "Parameter %(name) is missing", | |
82 | }, | |
83 | { | |
84 | .error_fmt = QERR_QMP_BAD_INPUT_OBJECT, | |
85 | .desc = "Bad QMP input object", | |
86 | }, | |
87 | { | |
e16a1812 MA |
88 | .error_fmt = QERR_UNDEFINED_ERROR, |
89 | .desc = "An undefined error has ocurred", | |
4b9d4683 | 90 | }, |
9f9daf9a LC |
91 | {} |
92 | }; | |
93 | ||
94 | /** | |
95 | * qerror_new(): Create a new QError | |
96 | * | |
97 | * Return strong reference. | |
98 | */ | |
99 | QError *qerror_new(void) | |
100 | { | |
101 | QError *qerr; | |
102 | ||
103 | qerr = qemu_mallocz(sizeof(*qerr)); | |
104 | QOBJECT_INIT(qerr, &qerror_type); | |
105 | ||
106 | return qerr; | |
107 | } | |
108 | ||
109 | static void qerror_abort(const QError *qerr, const char *fmt, ...) | |
110 | { | |
111 | va_list ap; | |
112 | ||
113 | fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func); | |
114 | fprintf(stderr, "qerror: -> "); | |
115 | ||
116 | va_start(ap, fmt); | |
117 | vfprintf(stderr, fmt, ap); | |
118 | va_end(ap); | |
119 | ||
120 | fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr); | |
121 | abort(); | |
122 | } | |
123 | ||
124 | static void qerror_set_data(QError *qerr, const char *fmt, va_list *va) | |
125 | { | |
126 | QObject *obj; | |
127 | ||
128 | obj = qobject_from_jsonv(fmt, va); | |
129 | if (!obj) { | |
130 | qerror_abort(qerr, "invalid format '%s'", fmt); | |
131 | } | |
132 | if (qobject_type(obj) != QTYPE_QDICT) { | |
133 | qerror_abort(qerr, "error format is not a QDict '%s'", fmt); | |
134 | } | |
135 | ||
136 | qerr->error = qobject_to_qdict(obj); | |
137 | ||
138 | obj = qdict_get(qerr->error, "class"); | |
139 | if (!obj) { | |
140 | qerror_abort(qerr, "missing 'class' key in '%s'", fmt); | |
141 | } | |
142 | if (qobject_type(obj) != QTYPE_QSTRING) { | |
143 | qerror_abort(qerr, "'class' key value should be a QString"); | |
144 | } | |
145 | ||
146 | obj = qdict_get(qerr->error, "data"); | |
147 | if (!obj) { | |
148 | qerror_abort(qerr, "missing 'data' key in '%s'", fmt); | |
149 | } | |
150 | if (qobject_type(obj) != QTYPE_QDICT) { | |
151 | qerror_abort(qerr, "'data' key value should be a QDICT"); | |
152 | } | |
153 | } | |
154 | ||
155 | static void qerror_set_desc(QError *qerr, const char *fmt) | |
156 | { | |
157 | int i; | |
158 | ||
159 | // FIXME: inefficient loop | |
160 | ||
161 | for (i = 0; qerror_table[i].error_fmt; i++) { | |
162 | if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { | |
163 | qerr->entry = &qerror_table[i]; | |
164 | return; | |
165 | } | |
166 | } | |
167 | ||
168 | qerror_abort(qerr, "error format '%s' not found", fmt); | |
169 | } | |
170 | ||
171 | /** | |
172 | * qerror_from_info(): Create a new QError from error information | |
173 | * | |
174 | * The information consists of: | |
175 | * | |
176 | * - file the file name of where the error occurred | |
177 | * - linenr the line number of where the error occurred | |
178 | * - func the function name of where the error occurred | |
179 | * - fmt JSON printf-like dictionary, there must exist keys 'class' and | |
180 | * 'data' | |
181 | * - va va_list of all arguments specified by fmt | |
182 | * | |
183 | * Return strong reference. | |
184 | */ | |
185 | QError *qerror_from_info(const char *file, int linenr, const char *func, | |
186 | const char *fmt, va_list *va) | |
187 | { | |
188 | QError *qerr; | |
189 | ||
190 | qerr = qerror_new(); | |
191 | qerr->linenr = linenr; | |
192 | qerr->file = file; | |
193 | qerr->func = func; | |
194 | ||
195 | if (!fmt) { | |
196 | qerror_abort(qerr, "QDict not specified"); | |
197 | } | |
198 | ||
199 | qerror_set_data(qerr, fmt, va); | |
200 | qerror_set_desc(qerr, fmt); | |
201 | ||
202 | return qerr; | |
203 | } | |
204 | ||
205 | static void parse_error(const QError *qerror, int c) | |
206 | { | |
207 | qerror_abort(qerror, "expected '%c' in '%s'", c, qerror->entry->desc); | |
208 | } | |
209 | ||
210 | static const char *append_field(QString *outstr, const QError *qerror, | |
211 | const char *start) | |
212 | { | |
213 | QObject *obj; | |
214 | QDict *qdict; | |
215 | QString *key_qs; | |
216 | const char *end, *key; | |
217 | ||
218 | if (*start != '%') | |
219 | parse_error(qerror, '%'); | |
220 | start++; | |
221 | if (*start != '(') | |
222 | parse_error(qerror, '('); | |
223 | start++; | |
224 | ||
225 | end = strchr(start, ')'); | |
226 | if (!end) | |
227 | parse_error(qerror, ')'); | |
228 | ||
229 | key_qs = qstring_from_substr(start, 0, end - start - 1); | |
230 | key = qstring_get_str(key_qs); | |
231 | ||
232 | qdict = qobject_to_qdict(qdict_get(qerror->error, "data")); | |
233 | obj = qdict_get(qdict, key); | |
234 | if (!obj) { | |
235 | qerror_abort(qerror, "key '%s' not found in QDict", key); | |
236 | } | |
237 | ||
238 | switch (qobject_type(obj)) { | |
239 | case QTYPE_QSTRING: | |
240 | qstring_append(outstr, qdict_get_str(qdict, key)); | |
241 | break; | |
242 | case QTYPE_QINT: | |
243 | qstring_append_int(outstr, qdict_get_int(qdict, key)); | |
244 | break; | |
245 | default: | |
246 | qerror_abort(qerror, "invalid type '%c'", qobject_type(obj)); | |
247 | } | |
248 | ||
249 | QDECREF(key_qs); | |
250 | return ++end; | |
251 | } | |
252 | ||
253 | /** | |
254 | * qerror_print(): Print QError data | |
255 | * | |
256 | * This function will print the member 'desc' of the specified QError object, | |
257 | * it uses qemu_error() for this, so that the output is routed to the right | |
258 | * place (ie. stderr or Monitor's device). | |
259 | */ | |
260 | void qerror_print(const QError *qerror) | |
261 | { | |
262 | const char *p; | |
263 | QString *qstring; | |
264 | ||
265 | assert(qerror->entry != NULL); | |
266 | ||
267 | qstring = qstring_new(); | |
268 | ||
269 | for (p = qerror->entry->desc; *p != '\0';) { | |
270 | if (*p != '%') { | |
271 | qstring_append_chr(qstring, *p++); | |
272 | } else if (*(p + 1) == '%') { | |
273 | qstring_append_chr(qstring, '%'); | |
274 | p += 2; | |
275 | } else { | |
276 | p = append_field(qstring, qerror, p); | |
277 | } | |
278 | } | |
279 | ||
280 | qemu_error("%s\n", qstring_get_str(qstring)); | |
281 | QDECREF(qstring); | |
282 | } | |
283 | ||
284 | /** | |
285 | * qobject_to_qerror(): Convert a QObject into a QError | |
286 | */ | |
287 | QError *qobject_to_qerror(const QObject *obj) | |
288 | { | |
289 | if (qobject_type(obj) != QTYPE_QERROR) { | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | return container_of(obj, QError, base); | |
294 | } | |
295 | ||
296 | /** | |
297 | * qerror_destroy_obj(): Free all memory allocated by a QError | |
298 | */ | |
299 | static void qerror_destroy_obj(QObject *obj) | |
300 | { | |
301 | QError *qerr; | |
302 | ||
303 | assert(obj != NULL); | |
304 | qerr = qobject_to_qerror(obj); | |
305 | ||
306 | QDECREF(qerr->error); | |
307 | qemu_free(qerr); | |
308 | } |