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b4748b9b AL |
1 | /* |
2 | * QObject JSON integration | |
3 | * | |
4 | * Copyright IBM, Corp. 2009 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.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 | */ | |
13 | ||
f2ad72b3 | 14 | #include "qemu/osdep.h" |
99dbfd1d | 15 | #include "qapi/error.h" |
86cdf9ec | 16 | #include "qapi/qmp/json-parser.h" |
998da0b1 | 17 | #include "qapi/qmp/json-writer.h" |
7b1b5d19 | 18 | #include "qapi/qmp/qjson.h" |
6b673957 | 19 | #include "qapi/qmp/qbool.h" |
452fcdbc | 20 | #include "qapi/qmp/qdict.h" |
47e6b297 | 21 | #include "qapi/qmp/qlist.h" |
15280c36 | 22 | #include "qapi/qmp/qnum.h" |
fc81fa1e | 23 | #include "qapi/qmp/qstring.h" |
b4748b9b | 24 | |
5086c997 | 25 | typedef struct JSONParsingState { |
b4748b9b | 26 | JSONMessageParser parser; |
b4748b9b | 27 | QObject *result; |
99dbfd1d | 28 | Error *err; |
b4748b9b AL |
29 | } JSONParsingState; |
30 | ||
62815d85 | 31 | static void consume_json(void *opaque, QObject *json, Error *err) |
b4748b9b | 32 | { |
62815d85 | 33 | JSONParsingState *s = opaque; |
99dbfd1d | 34 | |
2a4794ba MA |
35 | assert(!json != !err); |
36 | assert(!s->result || !s->err); | |
37 | ||
38 | if (s->result) { | |
39 | qobject_unref(s->result); | |
40 | s->result = NULL; | |
41 | error_setg(&s->err, "Expecting at most one JSON value"); | |
42 | } | |
43 | if (s->err) { | |
44 | qobject_unref(json); | |
45 | error_free(err); | |
46 | return; | |
47 | } | |
62815d85 | 48 | s->result = json; |
2a4794ba | 49 | s->err = err; |
b4748b9b AL |
50 | } |
51 | ||
2d36e843 MA |
52 | /* |
53 | * Parse @string as JSON value. | |
54 | * If @ap is non-null, interpolate %-escapes. | |
55 | * Takes ownership of %p arguments. | |
56 | * On success, return the JSON value. | |
57 | * On failure, store an error through @errp and return NULL. | |
58 | * Ownership of %p arguments becomes indeterminate then. To avoid | |
59 | * leaks, callers passing %p must terminate on error, e.g. by passing | |
60 | * &error_abort. | |
61 | */ | |
62 | static QObject *qobject_from_jsonv(const char *string, va_list *ap, | |
63 | Error **errp) | |
b4748b9b AL |
64 | { |
65 | JSONParsingState state = {}; | |
66 | ||
62815d85 | 67 | json_message_parser_init(&state.parser, consume_json, &state, ap); |
b4748b9b AL |
68 | json_message_parser_feed(&state.parser, string, strlen(string)); |
69 | json_message_parser_flush(&state.parser); | |
70 | json_message_parser_destroy(&state.parser); | |
71 | ||
dd98e848 MA |
72 | if (!state.result && !state.err) { |
73 | error_setg(&state.err, "Expecting a JSON value"); | |
74 | } | |
75 | ||
99dbfd1d | 76 | error_propagate(errp, state.err); |
b4748b9b AL |
77 | return state.result; |
78 | } | |
79 | ||
57348c2f | 80 | QObject *qobject_from_json(const char *string, Error **errp) |
8ff5a7d3 | 81 | { |
57348c2f | 82 | return qobject_from_jsonv(string, NULL, errp); |
8ff5a7d3 LC |
83 | } |
84 | ||
4ff18468 MA |
85 | /* |
86 | * Parse @string as JSON value with %-escapes interpolated. | |
87 | * Abort on error. Do not use with untrusted @string. | |
88 | * Return the resulting QObject. It is never null. | |
89 | */ | |
90 | QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap) | |
91 | { | |
92 | va_list ap_copy; | |
93 | QObject *obj; | |
94 | ||
95 | /* va_copy() is needed when va_list is an array type */ | |
96 | va_copy(ap_copy, ap); | |
97 | obj = qobject_from_jsonv(string, &ap_copy, &error_abort); | |
98 | va_end(ap_copy); | |
99 | ||
100 | assert(obj); | |
101 | return obj; | |
102 | } | |
103 | ||
6ce80fd8 MA |
104 | /* |
105 | * Parse @string as JSON value with %-escapes interpolated. | |
106 | * Abort on error. Do not use with untrusted @string. | |
107 | * Return the resulting QObject. It is never null. | |
108 | */ | |
109 | QObject *qobject_from_jsonf_nofail(const char *string, ...) | |
b4748b9b | 110 | { |
8ff5a7d3 | 111 | QObject *obj; |
b4748b9b AL |
112 | va_list ap; |
113 | ||
114 | va_start(ap, string); | |
4ff18468 | 115 | obj = qobject_from_vjsonf_nofail(string, ap); |
b4748b9b AL |
116 | va_end(ap); |
117 | ||
8ff5a7d3 | 118 | return obj; |
b4748b9b | 119 | } |
1fd825f7 | 120 | |
4ff18468 MA |
121 | /* |
122 | * Parse @string as JSON object with %-escapes interpolated. | |
123 | * Abort on error. Do not use with untrusted @string. | |
124 | * Return the resulting QDict. It is never null. | |
125 | */ | |
126 | QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap) | |
127 | { | |
128 | QDict *qdict; | |
129 | ||
130 | qdict = qobject_to(QDict, qobject_from_vjsonf_nofail(string, ap)); | |
131 | assert(qdict); | |
132 | return qdict; | |
133 | } | |
134 | ||
a193352f MA |
135 | /* |
136 | * Parse @string as JSON object with %-escapes interpolated. | |
137 | * Abort on error. Do not use with untrusted @string. | |
138 | * Return the resulting QDict. It is never null. | |
139 | */ | |
140 | QDict *qdict_from_jsonf_nofail(const char *string, ...) | |
141 | { | |
4ff18468 | 142 | QDict *qdict; |
a193352f MA |
143 | va_list ap; |
144 | ||
145 | va_start(ap, string); | |
4ff18468 | 146 | qdict = qdict_from_vjsonf_nofail(string, ap); |
a193352f | 147 | va_end(ap); |
4ff18468 | 148 | return qdict; |
a193352f MA |
149 | } |
150 | ||
998da0b1 MA |
151 | static void to_json(JSONWriter *writer, const char *name, |
152 | const QObject *obj) | |
1cd7741e | 153 | { |
998da0b1 MA |
154 | switch (qobject_type(obj)) { |
155 | case QTYPE_QNULL: | |
156 | json_writer_null(writer, name); | |
157 | break; | |
158 | case QTYPE_QNUM: { | |
159 | QNum *val = qobject_to(QNum, obj); | |
91f54d92 | 160 | |
998da0b1 MA |
161 | switch (val->kind) { |
162 | case QNUM_I64: | |
163 | json_writer_int64(writer, name, val->u.i64); | |
91f54d92 | 164 | break; |
998da0b1 MA |
165 | case QNUM_U64: |
166 | json_writer_uint64(writer, name, val->u.u64); | |
91f54d92 | 167 | break; |
998da0b1 MA |
168 | case QNUM_DOUBLE: |
169 | json_writer_double(writer, name, val->u.dbl); | |
91f54d92 MA |
170 | break; |
171 | default: | |
998da0b1 | 172 | abort(); |
91f54d92 | 173 | } |
1fd825f7 AL |
174 | break; |
175 | } | |
176 | case QTYPE_QSTRING: { | |
998da0b1 MA |
177 | QString *val = qobject_to(QString, obj); |
178 | ||
179 | json_writer_str(writer, name, qstring_get_str(val)); | |
1fd825f7 AL |
180 | break; |
181 | } | |
182 | case QTYPE_QDICT: { | |
7dc847eb | 183 | QDict *val = qobject_to(QDict, obj); |
7b1cd1c6 | 184 | const QDictEntry *entry; |
1fd825f7 | 185 | |
998da0b1 | 186 | json_writer_start_object(writer, name); |
7b1cd1c6 MA |
187 | |
188 | for (entry = qdict_first(val); | |
189 | entry; | |
190 | entry = qdict_next(val, entry)) { | |
998da0b1 | 191 | to_json(writer, qdict_entry_key(entry), qdict_entry_value(entry)); |
7b1cd1c6 MA |
192 | } |
193 | ||
998da0b1 | 194 | json_writer_end_object(writer); |
1fd825f7 AL |
195 | break; |
196 | } | |
197 | case QTYPE_QLIST: { | |
7dc847eb | 198 | QList *val = qobject_to(QList, obj); |
2f2ec111 | 199 | QListEntry *entry; |
1fd825f7 | 200 | |
998da0b1 | 201 | json_writer_start_array(writer, name); |
2f2ec111 MA |
202 | |
203 | QLIST_FOREACH_ENTRY(val, entry) { | |
998da0b1 | 204 | to_json(writer, NULL, qlist_entry_obj(entry)); |
2f2ec111 MA |
205 | } |
206 | ||
998da0b1 | 207 | json_writer_end_array(writer); |
1fd825f7 AL |
208 | break; |
209 | } | |
1fd825f7 | 210 | case QTYPE_QBOOL: { |
7dc847eb | 211 | QBool *val = qobject_to(QBool, obj); |
1fd825f7 | 212 | |
998da0b1 | 213 | json_writer_bool(writer, name, qbool_get_bool(val)); |
1fd825f7 AL |
214 | break; |
215 | } | |
a7c31816 | 216 | default: |
69dd62df | 217 | abort(); |
1fd825f7 AL |
218 | } |
219 | } | |
220 | ||
eab3a467 | 221 | GString *qobject_to_json_pretty(const QObject *obj, bool pretty) |
1fd825f7 | 222 | { |
998da0b1 | 223 | JSONWriter *writer = json_writer_new(pretty); |
212b6008 | 224 | |
998da0b1 MA |
225 | to_json(writer, NULL, obj); |
226 | return json_writer_get_and_free(writer); | |
212b6008 DB |
227 | } |
228 | ||
eab3a467 | 229 | GString *qobject_to_json(const QObject *obj) |
212b6008 | 230 | { |
6589f459 | 231 | return qobject_to_json_pretty(obj, false); |
1fd825f7 | 232 | } |