gstreamer/gst/tcp/gsttcpclientsink.c
Doug Nazar 3676a2c6de tcp: Rework client start error handling.
Ensure errors are cleaned up properly at the right level.
Abort connection attempts if we're cancelled.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1115>
2021-04-22 07:17:06 +00:00

426 lines
12 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
* Copyright (C) <2011> Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-tcpclientsink
* @title: tcpclientsink
* @see_also: #tcpclientsink
*
* ## Example launch line (server):
* |[
* nc -l -p 3000
* ]|
* ## Example launch line (client):
* |[
* gst-launch-1.0 fdsink fd=1 ! tcpclientsink port=3000
* ]|
* everything you type in the client is shown on the server (fd=1 means
* standard input which is the command line input file descriptor)
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#include "gsttcpelements.h"
#include "gsttcpclientsink.h"
/* TCPClientSink signals and args */
enum
{
FRAME_ENCODED,
/* FILL ME */
LAST_SIGNAL
};
GST_DEBUG_CATEGORY_STATIC (tcpclientsink_debug);
#define GST_CAT_DEFAULT (tcpclientsink_debug)
enum
{
PROP_0,
PROP_HOST,
PROP_PORT
};
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static void gst_tcp_client_sink_finalize (GObject * gobject);
static gboolean gst_tcp_client_sink_setcaps (GstBaseSink * bsink,
GstCaps * caps);
static GstFlowReturn gst_tcp_client_sink_render (GstBaseSink * bsink,
GstBuffer * buf);
static gboolean gst_tcp_client_sink_start (GstBaseSink * bsink);
static gboolean gst_tcp_client_sink_stop (GstBaseSink * bsink);
static gboolean gst_tcp_client_sink_unlock (GstBaseSink * bsink);
static gboolean gst_tcp_client_sink_unlock_stop (GstBaseSink * bsink);
static void gst_tcp_client_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_tcp_client_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
/*static guint gst_tcp_client_sink_signals[LAST_SIGNAL] = { 0 }; */
#define gst_tcp_client_sink_parent_class parent_class
G_DEFINE_TYPE (GstTCPClientSink, gst_tcp_client_sink, GST_TYPE_BASE_SINK);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (tcpclientsink, "tcpclientsink",
GST_RANK_NONE, GST_TYPE_TCP_CLIENT_SINK, tcp_element_init (plugin));
static void
gst_tcp_client_sink_class_init (GstTCPClientSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_tcp_client_sink_set_property;
gobject_class->get_property = gst_tcp_client_sink_get_property;
gobject_class->finalize = gst_tcp_client_sink_finalize;
g_object_class_install_property (gobject_class, PROP_HOST,
g_param_spec_string ("host", "Host", "The host/IP to send the packets to",
TCP_DEFAULT_HOST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PORT,
g_param_spec_int ("port", "Port", "The port to send the packets to",
0, TCP_HIGHEST_PORT, TCP_DEFAULT_PORT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class,
"TCP client sink", "Sink/Network",
"Send data as a client over the network via TCP",
"Thomas Vander Stichele <thomas at apestaart dot org>");
gstbasesink_class->start = gst_tcp_client_sink_start;
gstbasesink_class->stop = gst_tcp_client_sink_stop;
gstbasesink_class->set_caps = gst_tcp_client_sink_setcaps;
gstbasesink_class->render = gst_tcp_client_sink_render;
gstbasesink_class->unlock = gst_tcp_client_sink_unlock;
gstbasesink_class->unlock_stop = gst_tcp_client_sink_unlock_stop;
GST_DEBUG_CATEGORY_INIT (tcpclientsink_debug, "tcpclientsink", 0, "TCP sink");
}
static void
gst_tcp_client_sink_init (GstTCPClientSink * this)
{
this->host = g_strdup (TCP_DEFAULT_HOST);
this->port = TCP_DEFAULT_PORT;
this->socket = NULL;
this->cancellable = g_cancellable_new ();
GST_OBJECT_FLAG_UNSET (this, GST_TCP_CLIENT_SINK_OPEN);
}
static void
gst_tcp_client_sink_finalize (GObject * gobject)
{
GstTCPClientSink *this = GST_TCP_CLIENT_SINK (gobject);
if (this->cancellable)
g_object_unref (this->cancellable);
this->cancellable = NULL;
if (this->socket)
g_object_unref (this->socket);
this->socket = NULL;
g_free (this->host);
this->host = NULL;
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static gboolean
gst_tcp_client_sink_setcaps (GstBaseSink * bsink, GstCaps * caps)
{
return TRUE;
}
static GstFlowReturn
gst_tcp_client_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
GstTCPClientSink *sink;
GstMapInfo map;
gsize written = 0;
gssize rret;
GError *err = NULL;
sink = GST_TCP_CLIENT_SINK (bsink);
g_return_val_if_fail (GST_OBJECT_FLAG_IS_SET (sink, GST_TCP_CLIENT_SINK_OPEN),
GST_FLOW_FLUSHING);
gst_buffer_map (buf, &map, GST_MAP_READ);
GST_LOG_OBJECT (sink, "writing %" G_GSIZE_FORMAT " bytes for buffer data",
map.size);
/* write buffer data */
while (written < map.size) {
rret =
g_socket_send (sink->socket, (gchar *) map.data + written,
map.size - written, sink->cancellable, &err);
if (rret < 0)
goto write_error;
written += rret;
}
gst_buffer_unmap (buf, &map);
sink->data_written += written;
return GST_FLOW_OK;
/* ERRORS */
write_error:
{
GstFlowReturn ret;
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
ret = GST_FLOW_FLUSHING;
GST_DEBUG_OBJECT (sink, "Cancelled reading from socket");
} else {
GST_ELEMENT_ERROR (sink, RESOURCE, WRITE,
(_("Error while sending data to \"%s:%d\"."), sink->host, sink->port),
("Only %" G_GSIZE_FORMAT " of %" G_GSIZE_FORMAT " bytes written: %s",
written, map.size, err->message));
ret = GST_FLOW_ERROR;
}
gst_buffer_unmap (buf, &map);
g_clear_error (&err);
return ret;
}
}
static void
gst_tcp_client_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstTCPClientSink *tcpclientsink;
g_return_if_fail (GST_IS_TCP_CLIENT_SINK (object));
tcpclientsink = GST_TCP_CLIENT_SINK (object);
switch (prop_id) {
case PROP_HOST:
if (!g_value_get_string (value)) {
g_warning ("host property cannot be NULL");
break;
}
g_free (tcpclientsink->host);
tcpclientsink->host = g_value_dup_string (value);
break;
case PROP_PORT:
tcpclientsink->port = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_tcp_client_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstTCPClientSink *tcpclientsink;
g_return_if_fail (GST_IS_TCP_CLIENT_SINK (object));
tcpclientsink = GST_TCP_CLIENT_SINK (object);
switch (prop_id) {
case PROP_HOST:
g_value_set_string (value, tcpclientsink->host);
break;
case PROP_PORT:
g_value_set_int (value, tcpclientsink->port);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* create a socket for sending to remote machine */
static gboolean
gst_tcp_client_sink_start (GstBaseSink * bsink)
{
GstTCPClientSink *this = GST_TCP_CLIENT_SINK (bsink);
GError *err = NULL;
GList *addrs;
GList *cur_addr;
GSocketAddress *saddr = NULL;
if (GST_OBJECT_FLAG_IS_SET (this, GST_TCP_CLIENT_SINK_OPEN))
return TRUE;
addrs =
tcp_get_addresses (GST_ELEMENT (this), this->host, this->cancellable,
&err);
if (!addrs)
goto name_resolve;
GST_DEBUG_OBJECT (this, "opening sending client socket to %s:%d", this->host,
this->port);
cur_addr = addrs;
while (cur_addr) {
/* clean up from possible previous iterations */
g_clear_error (&err);
g_clear_object (&this->socket);
/* iterate over addresses until one works */
this->socket =
tcp_create_socket (GST_ELEMENT (this), &cur_addr, this->port, &saddr,
&err);
if (!this->socket)
goto no_socket;
GST_DEBUG_OBJECT (this, "opened sending client socket");
/* connect to server */
if (g_socket_connect (this->socket, saddr, this->cancellable, &err))
break;
/* failed to connect, release and try next address... */
g_clear_object (&saddr);
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED))
goto connect_failed;
}
/* final connect attempt failed */
if (err)
goto connect_failed;
GST_DEBUG_OBJECT (this, "connected to %s:%d", this->host, this->port);
g_list_free_full (g_steal_pointer (&addrs), g_object_unref);
g_object_unref (saddr);
GST_OBJECT_FLAG_SET (this, GST_TCP_CLIENT_SINK_OPEN);
this->data_written = 0;
return TRUE;
name_resolve:
{
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
GST_DEBUG_OBJECT (this, "Cancelled name resolution");
} else {
GST_ELEMENT_ERROR (this, RESOURCE, OPEN_READ, (NULL),
("Failed to resolve host '%s': %s", this->host, err->message));
}
g_clear_error (&err);
return FALSE;
}
no_socket:
{
g_list_free_full (g_steal_pointer (&addrs), g_object_unref);
GST_ELEMENT_ERROR (this, RESOURCE, OPEN_READ, (NULL),
("Failed to create socket: %s", err->message));
g_clear_error (&err);
return FALSE;
}
connect_failed:
{
g_list_free_full (g_steal_pointer (&addrs), g_object_unref);
if (g_error_matches (err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
GST_DEBUG_OBJECT (this, "Cancelled connecting");
} else {
GST_ELEMENT_ERROR (this, RESOURCE, OPEN_READ, (NULL),
("Failed to connect to host '%s:%d': %s", this->host, this->port,
err->message));
}
g_clear_error (&err);
/* pretend we opened ok for proper cleanup to happen */
GST_OBJECT_FLAG_SET (this, GST_TCP_CLIENT_SINK_OPEN);
gst_tcp_client_sink_stop (GST_BASE_SINK (this));
return FALSE;
}
}
static gboolean
gst_tcp_client_sink_stop (GstBaseSink * bsink)
{
GstTCPClientSink *this = GST_TCP_CLIENT_SINK (bsink);
GError *err = NULL;
if (!GST_OBJECT_FLAG_IS_SET (this, GST_TCP_CLIENT_SINK_OPEN))
return TRUE;
if (this->socket) {
GST_DEBUG_OBJECT (this, "closing socket");
if (!g_socket_close (this->socket, &err)) {
GST_ERROR_OBJECT (this, "Failed to close socket: %s", err->message);
g_clear_error (&err);
}
g_object_unref (this->socket);
this->socket = NULL;
}
GST_OBJECT_FLAG_UNSET (this, GST_TCP_CLIENT_SINK_OPEN);
return TRUE;
}
/* will be called only between calls to start() and stop() */
static gboolean
gst_tcp_client_sink_unlock (GstBaseSink * bsink)
{
GstTCPClientSink *sink = GST_TCP_CLIENT_SINK (bsink);
GST_DEBUG_OBJECT (sink, "set to flushing");
g_cancellable_cancel (sink->cancellable);
return TRUE;
}
/* will be called only between calls to start() and stop() */
static gboolean
gst_tcp_client_sink_unlock_stop (GstBaseSink * bsink)
{
GstTCPClientSink *sink = GST_TCP_CLIENT_SINK (bsink);
GST_DEBUG_OBJECT (sink, "unset flushing");
g_object_unref (sink->cancellable);
sink->cancellable = g_cancellable_new ();
return TRUE;
}