Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[qemu.git] / qapi / qmp-dispatch.c
1 /*
2 * Core Definitions for QAPI/QMP Dispatch
3 *
4 * Copyright IBM, Corp. 2011
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
14 #include "qapi/qmp/types.h"
15 #include "qapi/qmp/dispatch.h"
16 #include "qapi/qmp/json-parser.h"
17 #include "qapi-types.h"
18 #include "qapi/error.h"
19 #include "qapi/qmp/qerror.h"
20
21 static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp)
22 {
23 const QDictEntry *ent;
24 const char *arg_name;
25 const QObject *arg_obj;
26 bool has_exec_key = false;
27 QDict *dict = NULL;
28
29 if (qobject_type(request) != QTYPE_QDICT) {
30 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT,
31 "request is not a dictionary");
32 return NULL;
33 }
34
35 dict = qobject_to_qdict(request);
36
37 for (ent = qdict_first(dict); ent;
38 ent = qdict_next(dict, ent)) {
39 arg_name = qdict_entry_key(ent);
40 arg_obj = qdict_entry_value(ent);
41
42 if (!strcmp(arg_name, "execute")) {
43 if (qobject_type(arg_obj) != QTYPE_QSTRING) {
44 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute",
45 "string");
46 return NULL;
47 }
48 has_exec_key = true;
49 } else if (strcmp(arg_name, "arguments")) {
50 error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name);
51 return NULL;
52 }
53 }
54
55 if (!has_exec_key) {
56 error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute");
57 return NULL;
58 }
59
60 return dict;
61 }
62
63 static QObject *do_qmp_dispatch(QObject *request, Error **errp)
64 {
65 const char *command;
66 QDict *args, *dict;
67 QmpCommand *cmd;
68 QObject *ret = NULL;
69
70
71 dict = qmp_dispatch_check_obj(request, errp);
72 if (!dict || error_is_set(errp)) {
73 return NULL;
74 }
75
76 command = qdict_get_str(dict, "execute");
77 cmd = qmp_find_command(command);
78 if (cmd == NULL) {
79 error_set(errp, QERR_COMMAND_NOT_FOUND, command);
80 return NULL;
81 }
82 if (!cmd->enabled) {
83 error_set(errp, QERR_COMMAND_DISABLED, command);
84 return NULL;
85 }
86
87 if (!qdict_haskey(dict, "arguments")) {
88 args = qdict_new();
89 } else {
90 args = qdict_get_qdict(dict, "arguments");
91 QINCREF(args);
92 }
93
94 switch (cmd->type) {
95 case QCT_NORMAL:
96 cmd->fn(args, &ret, errp);
97 if (!error_is_set(errp)) {
98 if (cmd->options & QCO_NO_SUCCESS_RESP) {
99 g_assert(!ret);
100 } else if (!ret) {
101 ret = QOBJECT(qdict_new());
102 }
103 }
104 break;
105 }
106
107 QDECREF(args);
108
109 return ret;
110 }
111
112 QObject *qmp_build_error_object(Error *errp)
113 {
114 return qobject_from_jsonf("{ 'class': %s, 'desc': %s }",
115 ErrorClass_lookup[error_get_class(errp)],
116 error_get_pretty(errp));
117 }
118
119 QObject *qmp_dispatch(QObject *request)
120 {
121 Error *err = NULL;
122 QObject *ret;
123 QDict *rsp;
124
125 ret = do_qmp_dispatch(request, &err);
126
127 rsp = qdict_new();
128 if (err) {
129 qdict_put_obj(rsp, "error", qmp_build_error_object(err));
130 error_free(err);
131 } else if (ret) {
132 qdict_put_obj(rsp, "return", ret);
133 } else {
134 QDECREF(rsp);
135 return NULL;
136 }
137
138 return QOBJECT(rsp);
139 }