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[Qemu-devel] [PULL 12/32] qmp: Redo how the client requests out-of-band
From: |
Markus Armbruster |
Subject: |
[Qemu-devel] [PULL 12/32] qmp: Redo how the client requests out-of-band execution |
Date: |
Tue, 3 Jul 2018 17:37:08 +0200 |
Commit cf869d53172 "qmp: support out-of-band (oob) execution" added a
general mechanism for command-independent arguments just for an
out-of-band flag:
The "control" key is introduced to store this extra flag. "control"
field is used to store arguments that are shared by all the commands,
rather than command specific arguments. Let "run-oob" be the first.
However, it failed to reject unknown members of "control". For
instance, in QMP command
{"execute": "query-name", "id": 42, "control": {"crap": true}}
"crap" gets silently ignored.
Instead of fixing this, revert the general "control" mechanism
(because YAGNI), and do it the way I initially proposed, with key
"exec-oob". Simpler code, simper interface.
An out-of-band command
{"execute": "migrate-pause", "id": 42, "control": {"run-oob": true}}
becomes
{"exec-oob": "migrate-pause", "id": 42}
Signed-off-by: Markus Armbruster <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Message-Id: <address@hidden>
---
docs/devel/qapi-code-gen.txt | 10 +++----
docs/interop/qmp-spec.txt | 18 ++++++-------
monitor.c | 3 +++
qapi/qmp-dispatch.c | 51 +++++++++++++++---------------------
tests/qmp-test.c | 7 ++---
tests/test-qga.c | 3 +--
6 files changed, 39 insertions(+), 53 deletions(-)
diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt
index 9625798d16..f020f6bab2 100644
--- a/docs/devel/qapi-code-gen.txt
+++ b/docs/devel/qapi-code-gen.txt
@@ -649,13 +649,11 @@ example:
{ 'command': 'migrate_recover',
'data': { 'uri': 'str' }, 'allow-oob': true }
-To execute a command with out-of-band priority, the client specifies
-the "control" field in the request, with "run-oob" set to
-true. Example:
+To execute a command with out-of-band priority, the client uses key
+"exec-oob" instead of "execute". Example:
- => { "execute": "command-support-oob",
- "arguments": { ... },
- "control": { "run-oob": true } }
+ => { "exec-oob": "migrate-recover",
+ "arguments": { "uri": "tcp:192.168.1.200:12345" } }
<= { "return": { } }
Without it, even the commands that support out-of-band execution will
diff --git a/docs/interop/qmp-spec.txt b/docs/interop/qmp-spec.txt
index a1d6f9ee06..1566b8ae5e 100644
--- a/docs/interop/qmp-spec.txt
+++ b/docs/interop/qmp-spec.txt
@@ -92,12 +92,16 @@ Currently supported capabilities are:
The format for command execution is:
-{ "execute": json-string, "arguments": json-object, "id": json-value,
- "control": json-object }
+{ "execute": json-string, "arguments": json-object, "id": json-value }
+
+or
+
+{ "exec-oob": json-string, "arguments": json-object, "id": json-value }
Where,
-- The "execute" member identifies the command to be executed by the Server
+- The "execute" or "exec-oob" member identifies the command to be
+ executed by the server. The latter requests out-of-band execution.
- The "arguments" member is used to pass any arguments required for the
execution of the command, it is optional when no arguments are
required. Each command documents what contents will be considered
@@ -106,9 +110,6 @@ The format for command execution is:
command execution, it is optional and will be part of the response
if provided. The "id" member can be any json-value. A json-number
incremented for each successive command works fine.
-- The optional "control" member further specifies how the command is
- to be executed. Currently, its only member is optional "run-oob".
- See section "2.3.1 Out-of-band execution" for details.
2.3.1 Out-of-band execution
---------------------------
@@ -129,9 +130,6 @@ To be able to match responses back to their commands, the
client needs
to pass "id" with out-of-band commands. Passing it with all commands
is recommended for clients that accept capability "oob".
-To execute a command out-of-band, the client puts "run-oob": true into
-execute's member "control".
-
If the client sends in-band commands faster than the server can
execute them, the server will eventually drop commands to limit the
queue length. The sever sends event COMMAND_DROPPED then.
@@ -274,7 +272,7 @@ S: { "timestamp": { "seconds": 1258551470, "microseconds":
802384 },
3.7 Out-of-band execution
-------------------------
-C: { "execute": "migrate-pause", "id": 42, "control": { "run-oob": true } }
+C: { "exec-oob": "migrate-pause", "id": 42 }
S: { "id": 42,
"error": { "class": "GenericError",
"desc": "migrate-pause is currently only supported during
postcopy-active state" } }
diff --git a/monitor.c b/monitor.c
index 2e443bba13..3bf3e68bdc 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1300,6 +1300,9 @@ static bool qmp_cmd_oob_check(Monitor *mon, QDict *req,
Error **errp)
QmpCommand *cmd;
command = qdict_get_try_str(req, "execute");
+ if (!command) {
+ command = qdict_get_try_str(req, "exec-oob");
+ }
if (!command) {
error_setg(errp, "Command field 'execute' missing");
return false;
diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index 0ad0fab8ed..12be120fe7 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -23,11 +23,11 @@
QDict *qmp_dispatch_check_obj(const QObject *request, bool allow_oob,
Error **errp)
{
+ const char *exec_key = NULL;
const QDictEntry *ent;
const char *arg_name;
const QObject *arg_obj;
- bool has_exec_key = false;
- QDict *dict = NULL;
+ QDict *dict;
dict = qobject_to(QDict, request);
if (!dict) {
@@ -40,25 +40,25 @@ QDict *qmp_dispatch_check_obj(const QObject *request, bool
allow_oob,
arg_name = qdict_entry_key(ent);
arg_obj = qdict_entry_value(ent);
- if (!strcmp(arg_name, "execute")) {
+ if (!strcmp(arg_name, "execute")
+ || (!strcmp(arg_name, "exec-oob") && allow_oob)) {
if (qobject_type(arg_obj) != QTYPE_QSTRING) {
- error_setg(errp,
- "QMP input member 'execute' must be a string");
+ error_setg(errp, "QMP input member '%s' must be a string",
+ arg_name);
return NULL;
}
- has_exec_key = true;
+ if (exec_key) {
+ error_setg(errp, "QMP input member '%s' clashes with '%s'",
+ arg_name, exec_key);
+ return NULL;
+ }
+ exec_key = arg_name;
} else if (!strcmp(arg_name, "arguments")) {
if (qobject_type(arg_obj) != QTYPE_QDICT) {
error_setg(errp,
"QMP input member 'arguments' must be an object");
return NULL;
}
- } else if (!strcmp(arg_name, "control") && allow_oob) {
- if (qobject_type(arg_obj) != QTYPE_QDICT) {
- error_setg(errp,
- "QMP input member 'control' must be a dict");
- return NULL;
- }
} else {
error_setg(errp, "QMP input member '%s' is unexpected",
arg_name);
@@ -66,7 +66,7 @@ QDict *qmp_dispatch_check_obj(const QObject *request, bool
allow_oob,
}
}
- if (!has_exec_key) {
+ if (!exec_key) {
error_setg(errp, "QMP input lacks member 'execute'");
return NULL;
}
@@ -88,7 +88,11 @@ static QObject *do_qmp_dispatch(QmpCommandList *cmds,
QObject *request,
return NULL;
}
- command = qdict_get_str(dict, "execute");
+ command = qdict_get_try_str(dict, "execute");
+ if (!command) {
+ assert(allow_oob);
+ command = qdict_get_str(dict, "exec-oob");
+ }
cmd = qmp_find_command(cmds, command);
if (cmd == NULL) {
error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
@@ -137,25 +141,12 @@ QObject *qmp_build_error_object(Error *err)
}
/*
- * Detect whether a request should be run out-of-band, by quickly
- * peeking at whether we have: { "control": { "run-oob": true } }. By
- * default commands are run in-band.
+ * Does @qdict look like a command to be run out-of-band?
*/
bool qmp_is_oob(QDict *dict)
{
- QBool *bool_obj;
-
- dict = qdict_get_qdict(dict, "control");
- if (!dict) {
- return false;
- }
-
- bool_obj = qobject_to(QBool, qdict_get(dict, "run-oob"));
- if (!bool_obj) {
- return false;
- }
-
- return qbool_get_bool(bool_obj);
+ return qdict_haskey(dict, "exec-oob")
+ && !qdict_haskey(dict, "execute");
}
QObject *qmp_dispatch(QmpCommandList *cmds, QObject *request,
diff --git a/tests/qmp-test.c b/tests/qmp-test.c
index d73730945a..3f4e43bd2b 100644
--- a/tests/qmp-test.c
+++ b/tests/qmp-test.c
@@ -177,8 +177,7 @@ static void unblock_blocked_cmd(void)
static void send_oob_cmd_that_fails(QTestState *s, const char *id)
{
- qtest_async_qmp(s, "{ 'execute': 'migrate-pause', 'id': %s,"
- " 'control': { 'run-oob': true } }", id);
+ qtest_async_qmp(s, "{ 'exec-oob': 'migrate-pause', 'id': %s }", id);
}
static void recv_cmd_id(QTestState *s, const char *id)
@@ -230,9 +229,7 @@ static void test_qmp_oob(void)
* Try any command that does not support OOB but with OOB flag. We
* should get failure.
*/
- resp = qtest_qmp(qts,
- "{ 'execute': 'query-cpus',"
- " 'control': { 'run-oob': true } }");
+ resp = qtest_qmp(qts, "{ 'exec-oob': 'query-cpus' }");
g_assert(qdict_haskey(resp, "error"));
qobject_unref(resp);
diff --git a/tests/test-qga.c b/tests/test-qga.c
index febabc7ad5..daadf22ea3 100644
--- a/tests/test-qga.c
+++ b/tests/test-qga.c
@@ -249,8 +249,7 @@ static void test_qga_invalid_oob(gconstpointer fix)
QDict *ret, *error;
const char *class;
- ret = qmp_fd(fixture->fd, "{'execute': 'guest-ping',"
- " 'control': {'run-oob': true}}");
+ ret = qmp_fd(fixture->fd, "{'exec-oob': 'guest-ping'}");
g_assert_nonnull(ret);
error = qdict_get_qdict(ret, "error");
--
2.17.1
- [Qemu-devel] [PULL 03/32] docs/interop/qmp: Improve OOB documentation, (continued)
- [Qemu-devel] [PULL 03/32] docs/interop/qmp: Improve OOB documentation, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 15/32] qmp: Simplify code around monitor_qmp_dispatch_one(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 19/32] monitor: Rename use_io_thr to use_io_thread, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 26/32] qmp: Simplify monitor_qmp_respond(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 24/32] qmp: Replace monitor_json_emitter{, raw}() by qmp_{queue, send}_response(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 20/32] monitor: Peel off @mon_global wrapper, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 22/32] qmp: De-duplicate error response building, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 21/32] qobject: New qdict_from_jsonf_nofail(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 28/32] qmp: Switch timestamp_put() to qdict_from_jsonf_nofail(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 25/32] qmp: Replace get_qmp_greeting() by qmp_greeting(), Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 12/32] qmp: Redo how the client requests out-of-band execution,
Markus Armbruster <=
- [Qemu-devel] [PULL 17/32] qmp: Don't let malformed in-band commands jump the queue, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 31/32] monitor: Improve some comments, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 11/32] qmp qemu-ga: Fix qemu-ga not to accept "control", Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 30/32] qmp: Clean up capability negotiation after commit 02130314d8c, Markus Armbruster, 2018/07/03
- [Qemu-devel] [PULL 23/32] qmp: Use QDict * instead of QObject * for response objects, Markus Armbruster, 2018/07/03