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authorEric Blake <eblake@redhat.com>2016-04-28 15:45:23 -0600
committerMarkus Armbruster <armbru@redhat.com>2016-05-12 09:47:54 +0200
commit3df016f185521f8dfa5bd89168722887156405c7 (patch)
treefe7cda79ac5c168a6da67d19fcf5095b2269ead1
parent3bc97fd5924561d92f32758c67eaffd2e4e25038 (diff)
qmp: Support explicit null during visits
Implement the new type_null() callback for the qmp input and output visitors. While we don't yet have a use for this in QAPI input (the generator will need some tweaks first), some potential usages have already been discussed on the list. Meanwhile, the output visitor could already output explicit null via type_any, but this gives us finer control. At any rate, it's easy to test that we can round-trip an explicit null through manual use of visit_type_null() wrapped by a virtual visit_start_struct() walk, even if we can't do the visit in a QAPI type. Repurpose the test_visitor_out_empty test, particularly since a future patch will tighten semantics to forbid use of qmp_output_get_qobject() without at least one intervening visit_type_*. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1461879932-9020-16-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
-rw-r--r--qapi/qmp-input-visitor.c8
-rw-r--r--qapi/qmp-output-visitor.c3
-rw-r--r--tests/check-qnull.c13
-rw-r--r--tests/test-qmp-input-visitor.c29
-rw-r--r--tests/test-qmp-output-visitor.c20
5 files changed, 64 insertions, 9 deletions
diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index fa460a3c37..30e7cb38f2 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -342,7 +342,13 @@ static void qmp_input_type_any(Visitor *v, const char *name, QObject **obj,
static void qmp_input_type_null(Visitor *v, const char *name, Error **errp)
{
- abort();
+ QmpInputVisitor *qiv = to_qiv(v);
+ QObject *qobj = qmp_input_get_object(qiv, name, true);
+
+ if (qobject_type(qobj) != QTYPE_QNULL) {
+ error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
+ "null");
+ }
}
static void qmp_input_optional(Visitor *v, const char *name, bool *present)
diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c
index adf7731e3f..5681ad3471 100644
--- a/qapi/qmp-output-visitor.c
+++ b/qapi/qmp-output-visitor.c
@@ -198,7 +198,8 @@ static void qmp_output_type_any(Visitor *v, const char *name, QObject **obj,
static void qmp_output_type_null(Visitor *v, const char *name, Error **errp)
{
- abort();
+ QmpOutputVisitor *qov = to_qov(v);
+ qmp_output_add_obj(qov, name, qnull());
}
/* Finish building, and return the root object. Will not be NULL. */
diff --git a/tests/check-qnull.c b/tests/check-qnull.c
index 4a1c3d830e..fd9c68f7e1 100644
--- a/tests/check-qnull.c
+++ b/tests/check-qnull.c
@@ -11,7 +11,9 @@
#include "qapi/qmp/qobject.h"
#include "qemu-common.h"
+#include "qapi/qmp-input-visitor.h"
#include "qapi/qmp-output-visitor.h"
+#include "qapi/error.h"
/*
* Public Interface test-cases
@@ -37,6 +39,7 @@ static void qnull_visit_test(void)
{
QObject *obj;
QmpOutputVisitor *qov;
+ QmpInputVisitor *qiv;
/*
* Most tests of interactions between QObject and visitors are in
@@ -45,13 +48,19 @@ static void qnull_visit_test(void)
*/
g_assert(qnull_.refcnt == 1);
+ obj = qnull();
+ qiv = qmp_input_visitor_new(obj, true);
+ qobject_decref(obj);
+ visit_type_null(qmp_input_get_visitor(qiv), NULL, &error_abort);
+ qmp_input_visitor_cleanup(qiv);
+
qov = qmp_output_visitor_new();
- /* FIXME: Empty visits are ugly, we should have a visit_type_null(). */
+ visit_type_null(qmp_output_get_visitor(qov), NULL, &error_abort);
obj = qmp_output_get_qobject(qov);
g_assert(obj == &qnull_);
qobject_decref(obj);
-
qmp_output_visitor_cleanup(qov);
+
g_assert(qnull_.refcnt == 1);
}
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index c039806e82..10e00ecbc7 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -279,6 +279,33 @@ static void test_visitor_in_any(TestInputVisitorData *data,
qobject_decref(res);
}
+static void test_visitor_in_null(TestInputVisitorData *data,
+ const void *unused)
+{
+ Visitor *v;
+ Error *err = NULL;
+ char *tmp;
+
+ /*
+ * FIXME: Since QAPI doesn't know the 'null' type yet, we can't
+ * test visit_type_null() by reading into a QAPI struct then
+ * checking that it was populated correctly. The best we can do
+ * for now is ensure that we consumed null from the input, proven
+ * by the fact that we can't re-read the key; and that we detect
+ * when input is not null.
+ */
+
+ v = visitor_input_test_init(data, "{ 'a': null, 'b': '' }");
+ visit_start_struct(v, NULL, NULL, 0, &error_abort);
+ visit_type_null(v, "a", &error_abort);
+ visit_type_str(v, "a", &tmp, &err);
+ g_assert(!tmp);
+ error_free_or_abort(&err);
+ visit_type_null(v, "b", &err);
+ error_free_or_abort(&err);
+ visit_end_struct(v, &error_abort);
+}
+
static void test_visitor_in_union_flat(TestInputVisitorData *data,
const void *unused)
{
@@ -829,6 +856,8 @@ int main(int argc, char **argv)
&in_visitor_data, test_visitor_in_list);
input_visitor_test_add("/visitor/input/any",
&in_visitor_data, test_visitor_in_any);
+ input_visitor_test_add("/visitor/input/null",
+ &in_visitor_data, test_visitor_in_null);
input_visitor_test_add("/visitor/input/union-flat",
&in_visitor_data, test_visitor_in_union_flat);
input_visitor_test_add("/visitor/input/alternate",
diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index fddb5a6e90..8acc22961b 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -477,13 +477,23 @@ static void test_visitor_out_alternate(TestOutputVisitorData *data,
qobject_decref(arg);
}
-static void test_visitor_out_empty(TestOutputVisitorData *data,
- const void *unused)
+static void test_visitor_out_null(TestOutputVisitorData *data,
+ const void *unused)
{
QObject *arg;
+ QDict *qdict;
+ QObject *nil;
+ visit_start_struct(data->ov, NULL, NULL, 0, &error_abort);
+ visit_type_null(data->ov, "a", &error_abort);
+ visit_end_struct(data->ov, &error_abort);
arg = qmp_output_get_qobject(data->qov);
- g_assert(qobject_type(arg) == QTYPE_QNULL);
+ g_assert(qobject_type(arg) == QTYPE_QDICT);
+ qdict = qobject_to_qdict(arg);
+ g_assert_cmpint(qdict_size(qdict), ==, 1);
+ nil = qdict_get(qdict, "a");
+ g_assert(nil);
+ g_assert(qobject_type(nil) == QTYPE_QNULL);
qobject_decref(arg);
}
@@ -837,8 +847,8 @@ int main(int argc, char **argv)
&out_visitor_data, test_visitor_out_union_flat);
output_visitor_test_add("/visitor/output/alternate",
&out_visitor_data, test_visitor_out_alternate);
- output_visitor_test_add("/visitor/output/empty",
- &out_visitor_data, test_visitor_out_empty);
+ output_visitor_test_add("/visitor/output/null",
+ &out_visitor_data, test_visitor_out_null);
output_visitor_test_add("/visitor/output/native_list/int",
&out_visitor_data,
test_visitor_out_native_list_int);