[PATCH weston v4 1/9] protocol: add weston-debug.xml

Emre Ucan eucan at de.adit-jv.com
Thu Oct 12 11:13:41 UTC 2017


From: Pekka Paalanen <pq at iki.fi>

This is a new debugging extension for non-production environments. The
aim is to replace all build-time choosable debug prints in the
compositor with runtime subscribable debug streams.

Signed-off-by: Pekka Paalanen <pq at iki.fi>

Added new libweston-$MAJOR-protocols.pc file and install that
for external projects to find the XML files installed by libweston.

Signed-off-by: Maniraj Devadoss <Maniraj.Devadoss at in.bosch.com>
---
 Makefile.am                         |   8 +++
 configure.ac                        |   1 +
 libweston/libweston-protocols.pc.in |   7 ++
 protocol/weston-debug.xml           | 128 ++++++++++++++++++++++++++++++++++++
 4 files changed, 144 insertions(+)
 create mode 100644 libweston/libweston-protocols.pc.in
 create mode 100644 protocol/weston-debug.xml

diff --git a/Makefile.am b/Makefile.am
index 1d3eedb..026cc58 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -116,6 +116,10 @@ libweston_ at LIBWESTON_MAJOR@_la_SOURCES =			\
 	shared/platform.h				\
 	shared/weston-egl-ext.h
 
+libweston_ at LIBWESTON_MAJOR@_datadir = $(datadir)/weston/protocols
+dist_libweston_ at LIBWESTON_MAJOR@_data_DATA =	\
+	protocol/weston-debug.xml
+
 lib_LTLIBRARIES += libweston-desktop- at LIBWESTON_MAJOR@.la
 libweston_desktop_ at LIBWESTON_MAJOR@_la_CPPFLAGS = $(AM_CPPFLAGS) -DIN_WESTON
 libweston_desktop_ at LIBWESTON_MAJOR@_la_CFLAGS = $(AM_CFLAGS) $(COMPOSITOR_CFLAGS)
@@ -166,6 +170,8 @@ endif
 nodist_libweston_ at LIBWESTON_MAJOR@_la_SOURCES =				\
 	protocol/weston-screenshooter-protocol.c			\
 	protocol/weston-screenshooter-server-protocol.h			\
+	protocol/weston-debug-protocol.c				\
+	protocol/weston-debug-server-protocol.h				\
 	protocol/text-cursor-position-protocol.c	\
 	protocol/text-cursor-position-server-protocol.h	\
 	protocol/text-input-unstable-v1-protocol.c			\
@@ -283,6 +289,7 @@ endif # BUILD_WESTON_LAUNCH
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = \
 	libweston/libweston-${LIBWESTON_MAJOR}.pc \
+	libweston/libweston-${LIBWESTON_MAJOR}-protocols.pc \
 	libweston-desktop/libweston-desktop-${LIBWESTON_MAJOR}.pc \
 	compositor/weston.pc
 
@@ -1528,6 +1535,7 @@ BUILT_SOURCES +=				\
 	protocol/text-input-unstable-v1-client-protocol.h
 
 EXTRA_DIST +=					\
+	protocol/weston-debug.xml		\
 	protocol/weston-desktop-shell.xml	\
 	protocol/weston-screenshooter.xml	\
 	protocol/text-cursor-position.xml	\
diff --git a/configure.ac b/configure.ac
index 21e3a41..e514944 100644
--- a/configure.ac
+++ b/configure.ac
@@ -687,6 +687,7 @@ AC_CONFIG_FILES([Makefile libweston/version.h compositor/weston.pc])
 # AC_CONFIG_FILES needs the full name when running autoconf, so we need to use
 # libweston_abi_version here, and outside [] because of m4 quoting rules
 AC_CONFIG_FILES([libweston/libweston-]libweston_major_version[.pc:libweston/libweston.pc.in])
+AC_CONFIG_FILES([libweston/libweston-]libweston_major_version[-protocols.pc:libweston/libweston-protocols.pc.in])
 AC_CONFIG_FILES([libweston-desktop/libweston-desktop-]libweston_major_version[.pc:libweston-desktop/libweston-desktop.pc.in])
 
 AM_CONDITIONAL([HAVE_GIT_REPO], [test -f $srcdir/.git/logs/HEAD])
diff --git a/libweston/libweston-protocols.pc.in b/libweston/libweston-protocols.pc.in
new file mode 100644
index 0000000..46fd586
--- /dev/null
+++ b/libweston/libweston-protocols.pc.in
@@ -0,0 +1,7 @@
+prefix=@prefix@
+datarootdir=@datarootdir@
+pkgdatadir=@datadir@/@PACKAGE@/protocols
+
+Name: libWeston Protocols
+Description: libWeston protocol files
+Version: @WESTON_VERSION@
diff --git a/protocol/weston-debug.xml b/protocol/weston-debug.xml
new file mode 100644
index 0000000..fa8d21d
--- /dev/null
+++ b/protocol/weston-debug.xml
@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="weston_debug">
+
+  <copyright>
+    Copyright © 2017 Pekka Paalanen pq at iki.fi
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+  </copyright>
+
+  <interface name="weston_debug_v1" version="1">
+    <description summary="weston internal debugging">
+      This is a generic debugging interface for Weston internals, the global
+      object advertized through wl_registry.
+
+      WARNING: This interface by design allows a denial-of-service attack. It
+      should not be offered in production, or proper authorization mechnisms
+      must be enforced.
+
+      The idea is for a client to provide a file descriptor that the server
+      uses for printing debug information. The server uses the file
+      descriptor in blocking writes mode, which exposes the denial-of-service
+      risk. The blocking mode is necessary to ensure all debug messages can
+      be easily printed in place. It also ensures message ordering if a
+      client subcribes to more than one debug stream.
+
+      The available debugging features depend on the server. There is no
+      explicit API for discovering the supported debug stream names. A server
+      should implement a debug stream named "list" where the server prints
+      the names and descriptions of all debug streams it supports to the
+      stream file descriptor.
+
+      A debug stream can be one-shot where the server prints the requested
+      information and then closes it, or continuous where server keeps on
+      printing until the client stops it. Or anything in between.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy factory object">
+	Destroys the factory object, but does not affect any other objects.
+      </description>
+    </request>
+
+    <request name="subscribe">
+      <description summary="subscribe to a debug stream">
+	Subscribe to a named debug stream. The server will start printing
+	to the given file descriptor.
+
+	If the named debug stream is a one-shot dump, the server will send
+	weston_debug_stream_v1.complete event once all requested data has
+	been printed. Otherwise, the server will continue streaming debug
+	prints until the subscription object is destroyed.
+
+	If the debug stream name is unknown to the server, the server will
+	immediately respond with weston_debug_stream_v1.failure event.
+      </description>
+
+      <arg name="name" type="string" allow-null="false"
+           summary="debug stream name"/>
+      <arg name="streamfd" type="fd" summary="write stream file descriptor"/>
+      <arg name="stream" type="new_id" interface="weston_debug_stream_v1"
+           summary="created debug stream object"/>
+    </request>
+  </interface>
+
+  <interface name="weston_debug_stream_v1" version="1">
+    <description summary="A subscribed debug stream">
+      Represents one subscribed debug stream, created with
+      weston_debug_v1.subscribe. When the object is created, it is associated
+      with a given file descriptor. The server will continue writing to the
+      file descriptor until the object is destroyed or the server sends an
+      event through the object.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="close a debug stream">
+	Destroys the object, which causes the server to stop writing into
+	and closes the associated file descriptor if it was not closed
+	already.
+
+	Use a wl_display.sync if the clients needs to guarantee the file
+	descriptor is closed before continuing.
+      </description>
+    </request>
+
+    <event name="complete">
+      <description summary="server completed the debug stream">
+	The server has successfully finished writing to and has closed the
+	associated file descriptor.
+
+	This event is delivered only for one-shot debug streams where the
+	server dumps some data and stop. This is never delivered for
+	continuous debbug streams because they by definition never complete.
+      </description>
+    </event>
+
+    <event name="failure">
+      <description summary="server cannot continue the debug stream">
+	The server has stopped writing to and has closed the
+	associated file descriptor. The data already written to the file
+	descriptor is correct, but it may be truncated.
+
+	This event may be delivered at any time and for any kind of debug
+	stream. It may be due to a failure in or shutdown of the server.
+	The message argument may provide a hint of the reason.
+      </description>
+
+      <arg name="message" type="string" allow-null="true"
+           summary="human readable reason"/>
+    </event>
+  </interface>
+</protocol>
-- 
2.7.4



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