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From: Anthony PERARD <anthony.perard@citrix.com>
To: xen-devel@lists.xenproject.org
Cc: Anthony PERARD <anthony.perard@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	Wei Liu <wei.liu2@citrix.com>
Subject: [PATCH v8 04/17] libxl: Add wrapper around libxl__json_object_to_json JSON
Date: Fri, 4 Jan 2019 15:30:43 +0000	[thread overview]
Message-ID: <20190104153056.19138-5-anthony.perard@citrix.com> (raw)
In-Reply-To: <20190104153056.19138-1-anthony.perard@citrix.com>

That wrapper is going to be used to safely log a json_object, as
libxl__json_object_to_json return NULL on error. In the error case,
JSON() will return an invalid json string.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
---

Notes:
    v8:
        Acked
    v7:
        new patch
        There are no user yet because the first users is going to be in
        "libxl_qmp: Implementation of libxl__ev_qmp_*" which is already a
        huge patch, that 3 lines might get lost.

 tools/libxl/libxl_internal.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index aa9059ffec..16e6eb6c5e 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2046,6 +2046,9 @@ _hidden libxl__json_object *libxl__json_parse(libxl__gc *gc_opt, const char *s);
 
 _hidden char *libxl__json_object_to_json(libxl__gc *gc,
                                          const libxl__json_object *args);
+/* Always return a valid string, but invalid json on error. */
+#define JSON(o) \
+    (libxl__json_object_to_json(gc, (o)) ? : "<invalid-json-object>")
 
   /* Based on /local/domain/$domid/dm-version xenstore key
    * default is qemu xen traditional */
-- 
Anthony PERARD


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  parent reply	other threads:[~2019-01-04 15:31 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-04 15:30 [PATCH v8 00/17] libxl: Enable save/restore/migration of a restricted QEMU + libxl__ev_qmp_* Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 01/17] libxl: Enhance libxl__sendmsg_fds to deal with EINTR and EWOULDBLOCK Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 02/17] libxl_qmp: Separate QMP message generation from qmp_send_prepare Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 03/17] libxl_qmp: Change qmp_qemu_check_version to compare version Anthony PERARD
2019-01-04 15:30 ` Anthony PERARD [this message]
2019-01-04 15:30 ` [PATCH v8 05/17] libxl: Design of an async API to issue QMP commands to QEMU Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 06/17] libxl_qmp: Implementation of libxl__ev_qmp_* Anthony PERARD
2019-01-11 12:06   ` Ian Jackson
2019-01-11 12:16     ` Anthony PERARD
2019-01-11 12:21       ` Ian Jackson
2019-01-04 15:30 ` [PATCH v8 07/17] libxl_exec: Add libxl__spawn_initiate_failure Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 08/17] libxl: Add init/dispose of for libxl__domain_build_state Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 09/17] libxl_dm: Pre-open QMP socket for QEMU Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 10/17] libxl: Add dmss_init/dispose for libxl__dm_spawn_state Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 11/17] libxl: QEMU startup sync based on QMP Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 12/17] libxl_qmp: Store advertised QEMU version in libxl__ev_qmp Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 13/17] libxl: Change libxl__domain_suspend_device_model() to be async Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 14/17] libxl: Re-implement domain_suspend_device_model using libxl__ev_qmp Anthony PERARD
2019-01-04 15:30 ` [PATCH v8 15/17] libxl: Remove unused arg from libxl__sendmsg_fds Anthony PERARD
2019-01-04 16:04   ` Ian Jackson
2019-01-04 15:30 ` [PATCH v8 16/17] libxl_json: Remove libxl__json_object_append_to from header Anthony PERARD
2019-01-04 16:03   ` Ian Jackson
2019-01-04 15:30 ` [PATCH v8 17/17] libxl: Add comments to libxl__json_*get* functions Anthony PERARD
2019-01-11 11:55   ` Ian Jackson

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