aboutsummaryrefslogtreecommitdiff
path: root/qapi/qobject-input-visitor.c
blob: d192727e0b2f9f7f54b61c7a5416e30cb378b7f2 (plain)
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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
/*
 * Input Visitor
 *
 * Copyright (C) 2012-2016 Red Hat, Inc.
 * Copyright IBM, Corp. 2011
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 * See the COPYING.LIB file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qapi/qobject-input-visitor.h"
#include "qapi/visitor-impl.h"
#include "qemu/queue.h"
#include "qemu-common.h"
#include "qapi/qmp/types.h"
#include "qapi/qmp/qerror.h"

typedef struct StackObject {
    const char *name;            /* Name of @obj in its parent, if any */
    QObject *obj;                /* QDict or QList being visited */
    void *qapi; /* sanity check that caller uses same pointer */

    GHashTable *h;              /* If @obj is QDict: unvisited keys */
    const QListEntry *entry;    /* If @obj is QList: unvisited tail */
    unsigned index;             /* If @obj is QList: list index of @entry */

    QSLIST_ENTRY(StackObject) node; /* parent */
} StackObject;

struct QObjectInputVisitor {
    Visitor visitor;

    /* Root of visit at visitor creation. */
    QObject *root;

    /* Stack of objects being visited (all entries will be either
     * QDict or QList). */
    QSLIST_HEAD(, StackObject) stack;

    GString *errname;           /* Accumulator for full_name() */
};

static QObjectInputVisitor *to_qiv(Visitor *v)
{
    return container_of(v, QObjectInputVisitor, visitor);
}

static const char *full_name_nth(QObjectInputVisitor *qiv, const char *name,
                                 int n)
{
    StackObject *so;
    char buf[32];

    if (qiv->errname) {
        g_string_truncate(qiv->errname, 0);
    } else {
        qiv->errname = g_string_new("");
    }

    QSLIST_FOREACH(so , &qiv->stack, node) {
        if (n) {
            n--;
        } else if (qobject_type(so->obj) == QTYPE_QDICT) {
            g_string_prepend(qiv->errname, name ?: "<anonymous>");
            g_string_prepend_c(qiv->errname, '.');
        } else {
            snprintf(buf, sizeof(buf), "[%u]", so->index);
            g_string_prepend(qiv->errname, buf);
        }
        name = so->name;
    }
    assert(!n);

    if (name) {
        g_string_prepend(qiv->errname, name);
    } else if (qiv->errname->str[0] == '.') {
        g_string_erase(qiv->errname, 0, 1);
    } else if (!qiv->errname->str[0]) {
        return "<anonymous>";
    }

    return qiv->errname->str;
}

static const char *full_name(QObjectInputVisitor *qiv, const char *name)
{
    return full_name_nth(qiv, name, 0);
}

static QObject *qobject_input_try_get_object(QObjectInputVisitor *qiv,
                                             const char *name,
                                             bool consume)
{
    StackObject *tos;
    QObject *qobj;
    QObject *ret;

    if (QSLIST_EMPTY(&qiv->stack)) {
        /* Starting at root, name is ignored. */
        assert(qiv->root);
        return qiv->root;
    }

    /* We are in a container; find the next element. */
    tos = QSLIST_FIRST(&qiv->stack);
    qobj = tos->obj;
    assert(qobj);

    if (qobject_type(qobj) == QTYPE_QDICT) {
        assert(name);
        ret = qdict_get(qobject_to_qdict(qobj), name);
        if (tos->h && consume && ret) {
            bool removed = g_hash_table_remove(tos->h, name);
            assert(removed);
        }
    } else {
        assert(qobject_type(qobj) == QTYPE_QLIST);
        assert(!name);
        if (tos->entry) {
            ret = qlist_entry_obj(tos->entry);
            if (consume) {
                tos->entry = qlist_next(tos->entry);
            }
        } else {
            ret = NULL;
        }
        if (consume) {
            tos->index++;
        }
    }

    return ret;
}

static QObject *qobject_input_get_object(QObjectInputVisitor *qiv,
                                         const char *name,
                                         bool consume, Error **errp)
{
    QObject *obj = qobject_input_try_get_object(qiv, name, consume);

    if (!obj) {
        error_setg(errp, QERR_MISSING_PARAMETER, full_name(qiv, name));
    }
    return obj;
}

static void qdict_add_key(const char *key, QObject *obj, void *opaque)
{
    GHashTable *h = opaque;
    g_hash_table_insert(h, (gpointer) key, NULL);
}

static const QListEntry *qobject_input_push(QObjectInputVisitor *qiv,
                                            const char *name,
                                            QObject *obj, void *qapi)
{
    GHashTable *h;
    StackObject *tos = g_new0(StackObject, 1);

    assert(obj);
    tos->name = name;
    tos->obj = obj;
    tos->qapi = qapi;

    if (qobject_type(obj) == QTYPE_QDICT) {
        h = g_hash_table_new(g_str_hash, g_str_equal);
        qdict_iter(qobject_to_qdict(obj), qdict_add_key, h);
        tos->h = h;
    } else {
        assert(qobject_type(obj) == QTYPE_QLIST);
        tos->entry = qlist_first(qobject_to_qlist(obj));
        tos->index = -1;
    }

    QSLIST_INSERT_HEAD(&qiv->stack, tos, node);
    return tos->entry;
}


static void qobject_input_check_struct(Visitor *v, Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    StackObject *tos = QSLIST_FIRST(&qiv->stack);
    GHashTableIter iter;
    const char *key;

    assert(tos && !tos->entry);

    g_hash_table_iter_init(&iter, tos->h);
    if (g_hash_table_iter_next(&iter, (void **)&key, NULL)) {
        error_setg(errp, "Parameter '%s' is unexpected",
                   full_name(qiv, key));
    }
}

static void qobject_input_stack_object_free(StackObject *tos)
{
    if (tos->h) {
        g_hash_table_unref(tos->h);
    }

    g_free(tos);
}

static void qobject_input_pop(Visitor *v, void **obj)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    StackObject *tos = QSLIST_FIRST(&qiv->stack);

    assert(tos && tos->qapi == obj);
    QSLIST_REMOVE_HEAD(&qiv->stack, node);
    qobject_input_stack_object_free(tos);
}

static void qobject_input_start_struct(Visitor *v, const char *name, void **obj,
                                       size_t size, Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);

    if (obj) {
        *obj = NULL;
    }
    if (!qobj) {
        return;
    }
    if (qobject_type(qobj) != QTYPE_QDICT) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "object");
        return;
    }

    qobject_input_push(qiv, name, qobj, obj);

    if (obj) {
        *obj = g_malloc0(size);
    }
}


static void qobject_input_start_list(Visitor *v, const char *name,
                                     GenericList **list, size_t size,
                                     Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    const QListEntry *entry;

    if (list) {
        *list = NULL;
    }
    if (!qobj) {
        return;
    }
    if (qobject_type(qobj) != QTYPE_QLIST) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "array");
        return;
    }

    entry = qobject_input_push(qiv, name, qobj, list);
    if (entry && list) {
        *list = g_malloc0(size);
    }
}

static GenericList *qobject_input_next_list(Visitor *v, GenericList *tail,
                                            size_t size)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    StackObject *tos = QSLIST_FIRST(&qiv->stack);

    assert(tos && tos->obj && qobject_type(tos->obj) == QTYPE_QLIST);

    if (!tos->entry) {
        return NULL;
    }
    tail->next = g_malloc0(size);
    return tail->next;
}

static void qobject_input_check_list(Visitor *v, Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    StackObject *tos = QSLIST_FIRST(&qiv->stack);

    assert(tos && tos->obj && qobject_type(tos->obj) == QTYPE_QLIST);

    if (tos->entry) {
        error_setg(errp, "Only %u list elements expected in %s",
                   tos->index + 1, full_name_nth(qiv, NULL, 1));
    }
}


static void qobject_input_start_alternate(Visitor *v, const char *name,
                                          GenericAlternate **obj, size_t size,
                                          bool promote_int, Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, false, errp);

    if (!qobj) {
        *obj = NULL;
        return;
    }
    *obj = g_malloc0(size);
    (*obj)->type = qobject_type(qobj);
    if (promote_int && (*obj)->type == QTYPE_QINT) {
        (*obj)->type = QTYPE_QFLOAT;
    }
}

static void qobject_input_type_int64(Visitor *v, const char *name, int64_t *obj,
                                     Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    QInt *qint;

    if (!qobj) {
        return;
    }
    qint = qobject_to_qint(qobj);
    if (!qint) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "integer");
        return;
    }

    *obj = qint_get_int(qint);
}

static void qobject_input_type_uint64(Visitor *v, const char *name,
                                      uint64_t *obj, Error **errp)
{
    /* FIXME: qobject_to_qint mishandles values over INT64_MAX */
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    QInt *qint;

    if (!qobj) {
        return;
    }
    qint = qobject_to_qint(qobj);
    if (!qint) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "integer");
        return;
    }

    *obj = qint_get_int(qint);
}

static void qobject_input_type_bool(Visitor *v, const char *name, bool *obj,
                                    Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    QBool *qbool;

    if (!qobj) {
        return;
    }
    qbool = qobject_to_qbool(qobj);
    if (!qbool) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "boolean");
        return;
    }

    *obj = qbool_get_bool(qbool);
}

static void qobject_input_type_str(Visitor *v, const char *name, char **obj,
                                   Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    QString *qstr;

    *obj = NULL;
    if (!qobj) {
        return;
    }
    qstr = qobject_to_qstring(qobj);
    if (!qstr) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "string");
        return;
    }

    *obj = g_strdup(qstring_get_str(qstr));
}

static void qobject_input_type_number(Visitor *v, const char *name, double *obj,
                                      Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
    QInt *qint;
    QFloat *qfloat;

    if (!qobj) {
        return;
    }
    qint = qobject_to_qint(qobj);
    if (qint) {
        *obj = qint_get_int(qobject_to_qint(qobj));
        return;
    }

    qfloat = qobject_to_qfloat(qobj);
    if (qfloat) {
        *obj = qfloat_get_double(qobject_to_qfloat(qobj));
        return;
    }

    error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
               full_name(qiv, name), "number");
}

static void qobject_input_type_any(Visitor *v, const char *name, QObject **obj,
                                   Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);

    *obj = NULL;
    if (!qobj) {
        return;
    }

    qobject_incref(qobj);
    *obj = qobj;
}

static void qobject_input_type_null(Visitor *v, const char *name, Error **errp)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_get_object(qiv, name, true, errp);

    if (!qobj) {
        return;
    }

    if (qobject_type(qobj) != QTYPE_QNULL) {
        error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
                   full_name(qiv, name), "null");
    }
}

static void qobject_input_optional(Visitor *v, const char *name, bool *present)
{
    QObjectInputVisitor *qiv = to_qiv(v);
    QObject *qobj = qobject_input_try_get_object(qiv, name, false);

    if (!qobj) {
        *present = false;
        return;
    }

    *present = true;
}

static void qobject_input_free(Visitor *v)
{
    QObjectInputVisitor *qiv = to_qiv(v);

    while (!QSLIST_EMPTY(&qiv->stack)) {
        StackObject *tos = QSLIST_FIRST(&qiv->stack);

        QSLIST_REMOVE_HEAD(&qiv->stack, node);
        qobject_input_stack_object_free(tos);
    }

    qobject_decref(qiv->root);
    if (qiv->errname) {
        g_string_free(qiv->errname, TRUE);
    }
    g_free(qiv);
}

Visitor *qobject_input_visitor_new(QObject *obj)
{
    QObjectInputVisitor *v;

    assert(obj);
    v = g_malloc0(sizeof(*v));

    v->visitor.type = VISITOR_INPUT;
    v->visitor.start_struct = qobject_input_start_struct;
    v->visitor.check_struct = qobject_input_check_struct;
    v->visitor.end_struct = qobject_input_pop;
    v->visitor.start_list = qobject_input_start_list;
    v->visitor.next_list = qobject_input_next_list;
    v->visitor.check_list = qobject_input_check_list;
    v->visitor.end_list = qobject_input_pop;
    v->visitor.start_alternate = qobject_input_start_alternate;
    v->visitor.type_int64 = qobject_input_type_int64;
    v->visitor.type_uint64 = qobject_input_type_uint64;
    v->visitor.type_bool = qobject_input_type_bool;
    v->visitor.type_str = qobject_input_type_str;
    v->visitor.type_number = qobject_input_type_number;
    v->visitor.type_any = qobject_input_type_any;
    v->visitor.type_null = qobject_input_type_null;
    v->visitor.optional = qobject_input_optional;
    v->visitor.free = qobject_input_free;

    v->root = obj;
    qobject_incref(obj);

    return &v->visitor;
}