vdr-plugin-streamdev/server/connection.c

/*
 *  $Id: connection.c,v 1.16 2010/08/03 10:51:53 schmirl Exp $
 */
 
#include "server/connection.h"
#include "server/setup.h"
#include "server/suspend.h"
#include "common.h"

#include <vdr/tools.h>
#include <vdr/thread.h>
#include <vdr/transfer.h>
#include <string.h>
#include <stdarg.h>
#include <errno.h>

// device occupied timeout to prevent VDR main loop to immediately switch back
// when streamdev switched the live TV channel.
// Note that there is still a gap between the GetDevice() and SetOccupied()
// calls where the VDR main loop could strike
#define STREAMDEVTUNETIMEOUT 5

cServerConnection::cServerConnection(const char *Protocol, int Type):
		cTBSocket(Type),
		m_Protocol(Protocol),
		m_DeferClose(false),
		m_Pending(false),
		m_ReadBytes(0),
		m_WriteBytes(0),
		m_WriteIndex(0),
		m_OccupiedDev(NULL),
		m_SwitchTo(NULL)
{
}

cServerConnection::~cServerConnection() 
{
}

const cChannel* cServerConnection::ChannelFromString(const char *String, int *Apid, int *Dpid) {
	const cChannel *channel = NULL;
	char *string = strdup(String);
	char *ptr, *end;
	int apididx = 0;
	
	if ((ptr = strrchr(string, '+')) != NULL) {
		*(ptr++) = '\0';
		apididx = strtoul(ptr, &end, 10);
		Dprintf("found apididx: %d\n", apididx);
	}

	if (isnumber(string)) {
		int temp = strtol(String, NULL, 10);
		if (temp == 0)
			temp = cDevice::CurrentChannel();
		if (temp >= 1 && temp <= Channels.MaxNumber())
			channel = Channels.GetByNumber(temp);
	} else {
		channel = Channels.GetByChannelID(tChannelID::FromString(string));

		if (channel == NULL) {
			int i = 1;
			while ((channel = Channels.GetByNumber(i, 1)) != NULL) {
				if (String == channel->Name())
					break;

				i = channel->Number() + 1;
			}
		}
	}

	if (channel != NULL && apididx > 0) {
		int apid = 0, dpid = 0;
		int index = 1;

		for (int i = 0; channel->Apid(i) != 0; ++i, ++index) {
			if (index == apididx) {
				apid = channel->Apid(i);
				break;
			}
		}

		if (apid == 0) {
			for (int i = 0; channel->Dpid(i) != 0; ++i, ++index) {
				if (index == apididx) {
					dpid = channel->Dpid(i);
					break;
				}
			}
		}

		if (Apid != NULL) 
			*Apid = apid;
		if (Dpid != NULL) 
			*Dpid = dpid;
	}

	free(string);
	return channel;
}

bool cServerConnection::Read(void) 
{
	int b;
	if ((b = cTBSocket::Read(m_ReadBuffer + m_ReadBytes,
	                         sizeof(m_ReadBuffer) - m_ReadBytes - 1)) < 0) {
		esyslog("ERROR: read from client (%s) %s:%d failed: %m",
		        m_Protocol, RemoteIp().c_str(), RemotePort());
		return false;
	}

	if (b == 0) {
		isyslog("client (%s) %s:%d has closed connection",
		        m_Protocol, RemoteIp().c_str(), RemotePort());
		return false;
	}

	m_ReadBytes += b;
	m_ReadBuffer[m_ReadBytes] = '\0';

	char *end;
	bool result = true;
	while ((end = strchr(m_ReadBuffer, '\012')) != NULL) {
		*end = '\0';
		if (end > m_ReadBuffer && *(end - 1) == '\015')
			*(end - 1) = '\0';

		if (!Command(m_ReadBuffer))
			return false;

		m_ReadBytes -= ++end - m_ReadBuffer;
		if (m_ReadBytes > 0)
			memmove(m_ReadBuffer, end, m_ReadBytes);
	}

	if (m_ReadBytes == sizeof(m_ReadBuffer) - 1) {
		esyslog("ERROR: streamdev: input buffer overflow (%s) for %s:%d",
		        m_Protocol, RemoteIp().c_str(), RemotePort());
		return false;
	}
	
	return result;
}

bool cServerConnection::Write(void) 
{
	int b;
	if ((b = cTBSocket::Write(m_WriteBuffer + m_WriteIndex, 
	                          m_WriteBytes - m_WriteIndex)) < 0) {
		esyslog("ERROR: streamdev: write to client (%s) %s:%d failed: %m",
		        m_Protocol, RemoteIp().c_str(), RemotePort());
		return false;
	}

	m_WriteIndex += b;
	if (m_WriteIndex == m_WriteBytes) {
		m_WriteIndex = 0;
		m_WriteBytes = 0;
		if (m_Pending)
			Command(NULL);
		if (m_DeferClose)
			return false;
		Flushed();
	}
	return true;
}

bool cServerConnection::Respond(const char *Message, bool Last, ...) 
{
	char *buffer;
	int length;
	va_list ap;
	va_start(ap, Last);
	length = vasprintf(&buffer, Message, ap);
	va_end(ap);

	if (length < 0) {
		esyslog("ERROR: streamdev: buffer allocation failed (%s) for %s:%d",
				m_Protocol, RemoteIp().c_str(), RemotePort());
		return false;
	}

	if (m_WriteBytes + length + 2 > sizeof(m_WriteBuffer)) {
		esyslog("ERROR: streamdev: output buffer overflow (%s) for %s:%d", 
		        m_Protocol, RemoteIp().c_str(), RemotePort());
		free(buffer);
		return false;
	}
	Dprintf("OUT: |%s|\n", buffer);
	memcpy(m_WriteBuffer + m_WriteBytes, buffer, length);
	free(buffer);

	m_WriteBytes += length;
	m_WriteBuffer[m_WriteBytes++] = '\015';
	m_WriteBuffer[m_WriteBytes++] = '\012';
	m_Pending = !Last;
	return true;
}

bool cServerConnection::Close()
{
	if (IsOpen())
		isyslog("streamdev-server: closing %s connection to %s:%d", Protocol(), RemoteIp().c_str(), RemotePort());
	return cTBSocket::Close();
}

bool cServerConnection::UsedByLiveTV(cDevice *device)
{
	return device == cTransferControl::ReceiverDevice() ||
		(device->IsPrimaryDevice() && device->HasDecoder() && !device->Replaying());
}

cDevice *cServerConnection::SwitchDevice(const cChannel *Channel, int Priority) 
{
	// turn off the streams of this connection
	Detach();

	cDevice *device = cDevice::GetDevice(Channel, Priority, false);
	if (!device) {
		// can't switch - continue the current stream
		Attach();
		dsyslog("streamdev: GetDevice failed for channel %d (%s) at priority %d (PrimaryDevice=%d, ActualDevice=%d)", Channel->Number(), Channel->Name(), Priority, cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex());
	}
	else if (!device->IsTunedToTransponder(Channel) && UsedByLiveTV(device)) {
		// make sure VDR main loop doesn't switch back
		device->SetOccupied(STREAMDEVTUNETIMEOUT);
		if (device->SwitchChannel(Channel, false)) {
			// switched away live TV
			m_OccupiedDev = device;
			m_SwitchTo = Channel;
		}
		else {
			dsyslog("streamdev: SwitchChannel (live) failed for channel %d (%s) at priority %d (PrimaryDevice=%d, ActualDevice=%d, device=%d)", Channel->Number(), Channel->Name(), Priority, cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex(), device->CardIndex());
			device->SetOccupied(0);
			device = NULL;
		}
	}
	else if (!device->SwitchChannel(Channel, false)) {
		dsyslog("streamdev: SwitchChannel failed for channel %d (%s) at priority %d (PrimaryDevice=%d, ActualDevice=%d, device=%d)", Channel->Number(), Channel->Name(), Priority, cDevice::PrimaryDevice()->CardIndex(), cDevice::ActualDevice()->CardIndex(), device->CardIndex());
		device = NULL;
	}
	return device;
}

bool cServerConnection::ProvidesChannel(const cChannel *Channel, int Priority) 
{
	cDevice *device = cDevice::GetDevice(Channel, Priority, false, true);
	if (!device)
		dsyslog("streamdev: No device provides channel %d (%s) at priority %d", Channel->Number(), Channel->Name(), Priority);
	return device;
}

void cServerConnection::MainThreadHook()
{
	if (m_SwitchTo)
	{
		// switched away live TV. Try previous channel on other device first
		if (!Channels.SwitchTo(cDevice::CurrentChannel())) {
			// switch to streamdev channel otherwise
			Channels.SwitchTo(m_SwitchTo->Number());
			Skins.Message(mtInfo, tr("Streaming active"));
		}
		m_OccupiedDev->SetOccupied(0);
		m_SwitchTo = NULL;
	}
}

cString cServerConnection::ToText() const
{	return cString::sprintf("%s\t%s:%d", Protocol(), RemoteIp().c_str(), RemotePort()); }