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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 "qemu/osdep.h" | |
15 | #include "qapi/error.h" | |
16 | #include "qapi/qmp/types.h" | |
17 | #include "qapi/qmp/dispatch.h" | |
18 | #include "qapi/qmp/json-parser.h" | |
19 | #include "qapi/qmp/qjson.h" | |
20 | #include "qapi-types.h" | |
21 | #include "qapi/qmp/qerror.h" | |
22 | ||
23 | static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp) | |
24 | { | |
25 | const QDictEntry *ent; | |
26 | const char *arg_name; | |
27 | const QObject *arg_obj; | |
28 | bool has_exec_key = false; | |
29 | QDict *dict = NULL; | |
30 | ||
31 | dict = qobject_to_qdict(request); | |
32 | if (!dict) { | |
33 | error_setg(errp, "Expected '%s' in QMP input", "object"); | |
34 | return NULL; | |
35 | } | |
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_setg(errp, "QMP input object member '%s' expects '%s'", | |
45 | "execute", "string"); | |
46 | return NULL; | |
47 | } | |
48 | has_exec_key = true; | |
49 | } else if (!strcmp(arg_name, "arguments")) { | |
50 | if (qobject_type(arg_obj) != QTYPE_QDICT) { | |
51 | error_setg(errp, "QMP input object member '%s' expects '%s'", | |
52 | "arguments", "object"); | |
53 | return NULL; | |
54 | } | |
55 | } else { | |
56 | error_setg(errp, "QMP input object member '%s' is unexpected", | |
57 | arg_name); | |
58 | return NULL; | |
59 | } | |
60 | } | |
61 | ||
62 | if (!has_exec_key) { | |
63 | error_setg(errp, "Expected '%s' in QMP input", "execute"); | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | return dict; | |
68 | } | |
69 | ||
70 | static QObject *do_qmp_dispatch(QmpCommandList *cmds, QObject *request, | |
71 | Error **errp) | |
72 | { | |
73 | Error *local_err = NULL; | |
74 | const char *command; | |
75 | QDict *args, *dict; | |
76 | QmpCommand *cmd; | |
77 | QObject *ret = NULL; | |
78 | ||
79 | dict = qmp_dispatch_check_obj(request, errp); | |
80 | if (!dict) { | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | command = qdict_get_str(dict, "execute"); | |
85 | cmd = qmp_find_command(cmds, command); | |
86 | if (cmd == NULL) { | |
87 | error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND, | |
88 | "The command %s has not been found", command); | |
89 | return NULL; | |
90 | } | |
91 | if (!cmd->enabled) { | |
92 | error_setg(errp, "The command %s has been disabled for this instance", | |
93 | command); | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | if (!qdict_haskey(dict, "arguments")) { | |
98 | args = qdict_new(); | |
99 | } else { | |
100 | args = qdict_get_qdict(dict, "arguments"); | |
101 | QINCREF(args); | |
102 | } | |
103 | ||
104 | cmd->fn(args, &ret, &local_err); | |
105 | if (local_err) { | |
106 | error_propagate(errp, local_err); | |
107 | } else if (cmd->options & QCO_NO_SUCCESS_RESP) { | |
108 | g_assert(!ret); | |
109 | } else if (!ret) { | |
110 | ret = QOBJECT(qdict_new()); | |
111 | } | |
112 | ||
113 | QDECREF(args); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
118 | QObject *qmp_build_error_object(Error *err) | |
119 | { | |
120 | return qobject_from_jsonf("{ 'class': %s, 'desc': %s }", | |
121 | QapiErrorClass_lookup[error_get_class(err)], | |
122 | error_get_pretty(err)); | |
123 | } | |
124 | ||
125 | QObject *qmp_dispatch(QmpCommandList *cmds, QObject *request) | |
126 | { | |
127 | Error *err = NULL; | |
128 | QObject *ret; | |
129 | QDict *rsp; | |
130 | ||
131 | ret = do_qmp_dispatch(cmds, request, &err); | |
132 | ||
133 | rsp = qdict_new(); | |
134 | if (err) { | |
135 | qdict_put_obj(rsp, "error", qmp_build_error_object(err)); | |
136 | error_free(err); | |
137 | } else if (ret) { | |
138 | qdict_put_obj(rsp, "return", ret); | |
139 | } else { | |
140 | QDECREF(rsp); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | return QOBJECT(rsp); | |
145 | } |