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devapi_base.cpp
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//===================================================================================================================
//
// devapi_base.cpp - C++ source code file for TANGO device api
//
// programmer(s) - Andy Gotz (goetz@esrf.fr)
//
// original - March 2001
//
// Copyright (C) : 2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015
// European Synchrotron Radiation Facility
// BP 220, Grenoble 38043
// FRANCE
//
// This file is part of Tango.
//
// Tango is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License along with Tango.
// If not, see <http://www.gnu.org/licenses/>.
//
//
//===================================================================================================================
#if HAVE_CONFIG_H
#include <ac_config.h>
#endif
#include <tango.h>
#include <eventconsumer.h>
#include <devapi_utils.tpp>
#ifdef _TG_WINDOWS_
#include <sys/timeb.h>
#include <process.h>
#include <ws2tcpip.h>
#else
#include <sys/time.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pwd.h>
#endif /* _TG_WINDOWS_ */
#include <time.h>
#include <signal.h>
#include <algorithm>
using namespace CORBA;
namespace Tango
{
//-----------------------------------------------------------------------------
//
// ConnectionExt class methods:
//
// - assignement operator
//
//-----------------------------------------------------------------------------
Connection::ConnectionExt &Connection::ConnectionExt::operator=(TANGO_UNUSED(const Connection::ConnectionExt &rval))
{
return *this;
}
//-----------------------------------------------------------------------------
//
// Connection::Connection() - constructor to manage a connection to a device
//
//-----------------------------------------------------------------------------
Connection::Connection(ORB *orb_in)
: pasyn_ctr(0), pasyn_cb_ctr(0),
timeout(CLNT_TIMEOUT),
version(0), source(Tango::CACHE_DEV), ext(new ConnectionExt()),
tr_reco(true), prev_failed(false), prev_failed_t0(0.0),
user_connect_timeout(-1), tango_host_localhost(false)
{
//
// Some default init for access control
//
check_acc = true;
access = ACCESS_READ;
//
// If the proxy is created from inside a device server, use the server orb
//
ApiUtil *au = ApiUtil::instance();
if ((orb_in == NULL) && (CORBA::is_nil(au->get_orb()) == true))
{
if (au->in_server() == true)
{
ApiUtil::instance()->set_orb(Util::instance()->get_orb());
}
else
{
ApiUtil::instance()->create_orb();
}
}
else
{
if (orb_in != NULL)
{
au->set_orb(orb_in);
}
}
//
// Get user connect timeout if one is defined
//
int ucto = au->get_user_connect_timeout();
if (ucto != -1)
{
user_connect_timeout = ucto;
}
}
Connection::Connection(bool dummy)
: ext(Tango_nullptr), tr_reco(true), prev_failed(false), prev_failed_t0(0.0),
user_connect_timeout(-1), tango_host_localhost(false)
{
if (dummy)
{
#ifdef HAS_UNIQUE_PTR
ext.reset(new ConnectionExt());
#else
ext = new ConnectionExt();
#endif
}
}
//-----------------------------------------------------------------------------
//
// Connection::~Connection() - destructor to destroy connection to TANGO device
//
//-----------------------------------------------------------------------------
Connection::~Connection()
{
#ifndef HAS_UNIQUE_PTR
delete ext;
#endif
}
//-----------------------------------------------------------------------------
//
// Connection::Connection() - copy constructor
//
//-----------------------------------------------------------------------------
Connection::Connection(const Connection &sou)
: ext(Tango_nullptr)
{
dbase_used = sou.dbase_used;
from_env_var = sou.from_env_var;
host = sou.host;
port = sou.port;
port_num = sou.port_num;
db_host = sou.db_host;
db_port = sou.db_port;
db_port_num = sou.db_port_num;
ior = sou.ior;
pasyn_ctr = sou.pasyn_ctr;
pasyn_cb_ctr = sou.pasyn_cb_ctr;
device = sou.device;
if (sou.version >= 2)
{
device_2 = sou.device_2;
}
timeout = sou.timeout;
connection_state = sou.connection_state;
version = sou.version;
source = sou.source;
check_acc = sou.check_acc;
access = sou.access;
tr_reco = sou.tr_reco;
device_3 = sou.device_3;
prev_failed = sou.prev_failed;
prev_failed_t0 = sou.prev_failed_t0;
device_4 = sou.device_4;
user_connect_timeout = sou.user_connect_timeout;
tango_host_localhost = sou.tango_host_localhost;
device_5 = sou.device_5;
#ifdef HAS_UNIQUE_PTR
if (sou.ext.get() != NULL)
{
ext.reset(new ConnectionExt);
*(ext.get()) = *(sou.ext.get());
}
#else
if (sou.ext != NULL)
{
ext = new ConnectionExt();
*ext = *(sou.ext);
}
else
{
ext = NULL;
}
#endif
}
//-----------------------------------------------------------------------------
//
// Connection::operator=() - assignement operator
//
//-----------------------------------------------------------------------------
Connection &Connection::operator=(const Connection &rval)
{
dbase_used = rval.dbase_used;
from_env_var = rval.from_env_var;
host = rval.host;
port = rval.port;
port_num = rval.port_num;
db_host = rval.db_host;
db_port = rval.db_port;
db_port_num = rval.db_port_num;
ior = rval.ior;
pasyn_ctr = rval.pasyn_ctr;
pasyn_cb_ctr = rval.pasyn_cb_ctr;
device = rval.device;
if (rval.version >= 2)
{
device_2 = rval.device_2;
}
timeout = rval.timeout;
connection_state = rval.connection_state;
version = rval.version;
source = rval.source;
check_acc = rval.check_acc;
access = rval.access;
tr_reco = rval.tr_reco;
device_3 = rval.device_3;
prev_failed = rval.prev_failed;
prev_failed_t0 = rval.prev_failed_t0;
device_4 = rval.device_4;
user_connect_timeout = rval.user_connect_timeout;
tango_host_localhost = rval.tango_host_localhost;
device_5 = rval.device_5;
#ifdef HAS_UNIQUE_PTR
if (rval.ext.get() != NULL)
{
ext.reset(new ConnectionExt);
*(ext.get()) = *(rval.ext.get());
}
else
{
ext.reset(Tango_nullptr);
}
#else
if (rval.ext != NULL)
{
ext = new ConnectionExt();
*ext = *(rval.ext);
}
else
{
ext = NULL;
}
#endif
return *this;
}
//-----------------------------------------------------------------------------
//
// Connection::check_and_reconnect() methods family
//
// Check if a re-connection is needed and if true, try to reconnect.
// These meethods also manage a TangoMonitor object for thread safety.
// Some of them set parameters while the object is locked in order to pass
// them to the caller in thread safe way.
//
//-----------------------------------------------------------------------------
void Connection::check_and_reconnect()
{
int local_connection_state;
{
ReaderLock guard(con_to_mon);
local_connection_state = connection_state;
}
if (local_connection_state != CONNECTION_OK)
{
WriterLock guard(con_to_mon);
if (connection_state != CONNECTION_OK)
{
reconnect(dbase_used);
}
}
}
void Connection::check_and_reconnect(Tango::DevSource &sou)
{
int local_connection_state;
{
ReaderLock guard(con_to_mon);
local_connection_state = connection_state;
sou = source;
}
if (local_connection_state != CONNECTION_OK)
{
WriterLock guard(con_to_mon);
if (connection_state != CONNECTION_OK)
{
reconnect(dbase_used);
}
}
}
void Connection::check_and_reconnect(Tango::AccessControlType &act)
{
int local_connection_state;
{
ReaderLock guard(con_to_mon);
local_connection_state = connection_state;
act = access;
}
if (local_connection_state != CONNECTION_OK)
{
WriterLock guard(con_to_mon);
if (connection_state != CONNECTION_OK)
{
reconnect(dbase_used);
act = access;
}
}
}
void Connection::check_and_reconnect(Tango::DevSource &sou, Tango::AccessControlType &act)
{
int local_connection_state;
{
ReaderLock guard(con_to_mon);
local_connection_state = connection_state;
act = access;
sou = source;
}
if (local_connection_state != CONNECTION_OK)
{
WriterLock guard(con_to_mon);
if (connection_state != CONNECTION_OK)
{
reconnect(dbase_used);
act = access;
}
}
}
void Connection::set_connection_state(int con)
{
WriterLock guard(con_to_mon);
connection_state = con;
}
Tango::DevSource Connection::get_source()
{
ReaderLock guard(con_to_mon);
return source;
}
void Connection::set_source(Tango::DevSource sou)
{
WriterLock guard(con_to_mon);
source = sou;
}
//-----------------------------------------------------------------------------
//
// Connection::connect() - method to create connection to a TANGO device
// using its stringified CORBA reference i.e. IOR or corbaloc
//
//-----------------------------------------------------------------------------
void Connection::connect(std::string &corba_name)
{
bool retry = true;
long db_retries = DB_START_PHASE_RETRIES;
bool connect_to_db = false;
while (retry == true)
{
try
{
Object_var obj;
obj = ApiUtil::instance()->get_orb()->string_to_object(corba_name.c_str());
//
// Narrow CORBA string name to CORBA object
// First, try as a Device_5, then as a Device_4, then as .... and finally as a Device
//
// But we have want to know if the connection to the device is OK or not.
// The _narrow() call does not necessary generates a remote call. It all depends on the object IDL type
// stored in the IOR. If in the IOR, the IDL is the same than the one on which the narrow is done (Device_5 on both
// side for instance), then the _narrow call will not generate any remote call and therefore, we don know
// if the connection is OK or NOT. This is the reason of the _non_existent() call.
// In case the IDl in the IOR and in the narrow() call are different, then the _narrow() call try to execute a
// remote _is_a() call and therefore tries to connect to the device. IN this case, the _non_existent() call is
// useless. But because we don want to analyse the IOR ourself, we always call _non_existent()
// Reset the connection timeout only after the _non_existent call.
//
if (corba_name.find(DbObjName) != std::string::npos)
{
connect_to_db = true;
}
if (connect_to_db == false)
{
if (user_connect_timeout != -1)
{
omniORB::setClientConnectTimeout(user_connect_timeout);
}
else
{
omniORB::setClientConnectTimeout(NARROW_CLNT_TIMEOUT);
}
}
device_5 = Device_5::_narrow(obj);
if (CORBA::is_nil(device_5))
{
device_4 = Device_4::_narrow(obj);
if (CORBA::is_nil(device_4))
{
device_3 = Device_3::_narrow(obj);
if (CORBA::is_nil(device_3))
{
device_2 = Device_2::_narrow(obj);
if (CORBA::is_nil(device_2))
{
device = Device::_narrow(obj);
if (CORBA::is_nil(device))
{
std::cerr << "Can't build connection to object " << corba_name << std::endl;
connection_state = CONNECTION_NOTOK;
TangoSys_OMemStream desc;
desc << "Failed to connect to device " << dev_name();
desc << " (device nil after _narrowing)" << std::ends;
ApiConnExcept::throw_exception((const char *) API_CantConnectToDevice,
desc.str(),
(const char *) "Connection::connect()");
}
else
{
device->_non_existent();
version = 1;
}
}
else
{
device_2->_non_existent();
version = 2;
device = Device_2::_duplicate(device_2);
}
}
else
{
device_3->_non_existent();
version = 3;
device_2 = Device_3::_duplicate(device_3);
device = Device_3::_duplicate(device_3);
}
}
else
{
device_4->_non_existent();
version = 4;
device_3 = Device_4::_duplicate(device_4);
device_2 = Device_4::_duplicate(device_4);
device = Device_4::_duplicate(device_4);
}
}
else
{
device_5->_non_existent();
version = 5;
device_4 = Device_5::_duplicate(device_5);
device_3 = Device_5::_duplicate(device_5);
device_2 = Device_5::_duplicate(device_5);
device = Device_5::_duplicate(device_5);
}
//
// Warning! Some non standard code (omniORB specific).
// Set a flag if the object is running on a host with several net addresses. This is used during re-connection
// algo.
//
if (corba_name[0] == 'I' && corba_name[1] == 'O' && corba_name[2] == 'R')
{
IOP::IOR ior;
toIOR(corba_name.c_str(), ior);
IIOP::ProfileBody pBody;
IIOP::unmarshalProfile(ior.profiles[0], pBody);
CORBA::ULong total = pBody.components.length();
for (CORBA::ULong index = 0; index < total; index++)
{
IOP::TaggedComponent &c = pBody.components[index];
if (c.tag == 3)
{
ext->has_alt_adr = true;
break;
}
else
{
ext->has_alt_adr = false;
}
}
}
// if (connect_to_db == false)
// omniORB::setClientConnectTimeout(0);
retry = false;
//
// Mark the connection as OK and set timeout to its value
// (The default is 3 seconds)
//
connection_state = CONNECTION_OK;
if (timeout != CLNT_TIMEOUT)
{
set_timeout_millis(timeout);
}
}
catch (CORBA::SystemException &ce)
{
// if (connect_to_db == false)
// omniORB::setClientConnectTimeout(0);
TangoSys_OMemStream desc;
TangoSys_MemStream reason;
bool db_connect = false;
desc << "Failed to connect to ";
std::string::size_type pos = corba_name.find(':');
if (pos == std::string::npos)
{
desc << "device " << dev_name() << std::ends;
reason << API_CantConnectToDevice << std::ends;
}
else
{
std::string prot = corba_name.substr(0, pos);
if (prot == "corbaloc")
{
std::string::size_type tmp = corba_name.find('/');
if (tmp != std::string::npos)
{
std::string dev = corba_name.substr(tmp + 1);
if (dev == "database")
{
desc << "database on host ";
desc << db_host << " with port ";
desc << db_port << std::ends;
reason << "API_CantConnectToDatabase" << std::ends;
db_retries--;
if (db_retries != 0)
{
db_connect = true;
}
}
else
{
desc << "device " << dev_name() << std::ends;
if (CORBA::OBJECT_NOT_EXIST::_downcast(&ce) != 0)
{
reason << "API_DeviceNotDefined" << std::ends;
}
else if (CORBA::TRANSIENT::_downcast(&ce) != 0)
{
reason << "API_ServerNotRunning" << std::ends;
}
else
{
reason << API_CantConnectToDevice << std::ends;
}
}
}
else
{
desc << "device " << dev_name() << std::ends;
reason << API_CantConnectToDevice << std::ends;
}
}
else
{
desc << "device " << dev_name() << std::ends;
reason << API_CantConnectToDevice << std::ends;
}
}
if (db_connect == false)
{
ApiConnExcept::re_throw_exception(ce, reason.str(), desc.str(),
(const char *) "Connection::connect");
}
}
}
}
//-----------------------------------------------------------------------------
//
// Connection::toIOR() - Convert string IOR to omniORB IOR object
// omniORB specific code !!!
//
//-----------------------------------------------------------------------------
void Connection::toIOR(const char *iorstr, IOP::IOR &ior)
{
size_t s = (iorstr ? strlen(iorstr) : 0);
if (s < 4)
{
throw CORBA::MARSHAL(0, CORBA::COMPLETED_NO);
}
const char *p = iorstr;
if (p[0] != 'I' ||
p[1] != 'O' ||
p[2] != 'R' ||
p[3] != ':')
{
throw CORBA::MARSHAL(0, CORBA::COMPLETED_NO);
}
s = (s - 4) / 2; // how many octets are there in the string
p += 4;
cdrMemoryStream buf((CORBA::ULong) s, 0);
for (int i = 0; i < (int) s; i++)
{
int j = i * 2;
CORBA::Octet v;
if (p[j] >= '0' && p[j] <= '9')
{
v = ((p[j] - '0') << 4);
}
else if (p[j] >= 'a' && p[j] <= 'f')
{
v = ((p[j] - 'a' + 10) << 4);
}
else if (p[j] >= 'A' && p[j] <= 'F')
{
v = ((p[j] - 'A' + 10) << 4);
}
else
{
throw CORBA::MARSHAL(0, CORBA::COMPLETED_NO);
}
if (p[j + 1] >= '0' && p[j + 1] <= '9')
{
v += (p[j + 1] - '0');
}
else if (p[j + 1] >= 'a' && p[j + 1] <= 'f')
{
v += (p[j + 1] - 'a' + 10);
}
else if (p[j + 1] >= 'A' && p[j + 1] <= 'F')
{
v += (p[j + 1] - 'A' + 10);
}
else
{
throw CORBA::MARSHAL(0, CORBA::COMPLETED_NO);
}
buf.marshalOctet(v);
}
buf.rewindInputPtr();
CORBA::Boolean b = buf.unmarshalBoolean();
buf.setByteSwapFlag(b);
ior.type_id = IOP::IOR::unmarshaltype_id(buf);
ior.profiles <<= buf;
}
//-----------------------------------------------------------------------------
//
// Connection::reconnect() - reconnect to a CORBA object
//
//-----------------------------------------------------------------------------
void Connection::reconnect(bool db_used)
{
struct timeval now;
#ifndef _TG_WINDOWS_
gettimeofday(&now, NULL);
#else
struct _timeb now_win;
_ftime(&now_win);
now.tv_sec = (unsigned long) now_win.time;
now.tv_usec = (long) now_win.millitm * 1000;
#endif /* _TG_WINDOWS_ */
double t = (double) now.tv_sec + ((double) now.tv_usec / 1000000);
double delay = t - prev_failed_t0;
if (connection_state != CONNECTION_OK)
{
// Do not reconnect if to soon
if ((prev_failed == true) && delay < (RECONNECTION_DELAY / 1000))
{
TangoSys_OMemStream desc;
desc << "Failed to connect to device " << dev_name() << std::endl;
desc << "The connection request was delayed." << std::endl;
desc << "The last connection request was done less than " << RECONNECTION_DELAY << " ms ago" << std::ends;
Tango::Except::throw_exception((const char *) API_CantConnectToDevice,
desc.str(),
(const char *) "Connection::reconnect");
}
}
try
{
std::string corba_name;
if (connection_state != CONNECTION_OK)
{
if (db_used == true)
{
corba_name = get_corba_name(check_acc);
if (check_acc == false)
{
ApiUtil *au = ApiUtil::instance();
int db_num;
if (get_from_env_var() == true)
{
db_num = au->get_db_ind();
}
else
{
db_num = au->get_db_ind(get_db_host(), get_db_port_num());
}
(au->get_db_vect())[db_num]->clear_access_except_errors();
}
}
else
{
corba_name = build_corba_name();
}
connect(corba_name);
}
//
// Try to ping the device. With omniORB, it is possible that the first
// real access to the device is done when a call to one of the interface
// operation is done. Do it now.
//
if (connection_state == CONNECTION_OK)
{
try
{
// if (user_connect_timeout != -1)
// omniORB::setClientConnectTimeout(user_connect_timeout);
// else
// omniORB::setClientConnectTimeout(NARROW_CLNT_TIMEOUT);
device->ping();
// omniORB::setClientConnectTimeout(0);
prev_failed_t0 = t;
prev_failed = false;
//
// If the device is the database, call its post-reconnection method
//
// TODO: Implement this with a virtual method in Connection and Database
// class. Doing it now, will break compatibility (one more virtual method)
//
if (corba_name.find("database") != std::string::npos)
{
static_cast<Database *>(this)->post_reconnection();
}
}
catch (CORBA::SystemException &ce)
{
// omniORB::setClientConnectTimeout(0);
connection_state = CONNECTION_NOTOK;
TangoSys_OMemStream desc;
desc << "Failed to connect to device " << dev_name() << std::ends;
ApiConnExcept::re_throw_exception(ce,
(const char *) API_CantConnectToDevice,
desc.str(),
(const char *) "Connection::reconnect");
}
}
}
catch (DevFailed &)
{
prev_failed = true;
prev_failed_t0 = t;
throw;
}
}
//-----------------------------------------------------------------------------
//
// Connection::is_connected() - returns true if connection is in the OK state
//
//-----------------------------------------------------------------------------
bool Connection::is_connected()
{
bool connected = true;
ReaderLock guard(con_to_mon);
if (connection_state != CONNECTION_OK)
{
connected = false;
}
return connected;
}
//-----------------------------------------------------------------------------
//
// Connection::get_env_var() - Get an environment variable
//
// This method get an environment variable value from different source.
// which are (orderd by piority)
//
// 1 - A real environement variable
// 2 - A file ".tangorc" in the user home directory
// 3 - A file "/etc/tangorc"
//
// in : - env_var_name : The environment variable name
//
// out : - env_var : The string initialised with the env. variable value
//
// This method returns 0 of the env. variable is found. Otherwise, it returns -1
//
//-----------------------------------------------------------------------------
int Connection::get_env_var(const char *env_var_name, std::string &env_var)
{
int ret = -1;
char *env_c_str;
//
// try to get it as a classical env. variable
//
env_c_str = getenv(env_var_name);
if (env_c_str == NULL)
{
#ifndef _TG_WINDOWS_
uid_t user_id = geteuid();
struct passwd pw;
struct passwd *pw_ptr;
char buffer[1024];
if (getpwuid_r(user_id, &pw, buffer, sizeof(buffer), &pw_ptr) != 0)
{
return ret;
}
if (pw_ptr == NULL)
{
return ret;
}
//
// Try to get it from the user home dir file
//
std::string home_file(pw.pw_dir);
home_file = home_file + "/" + USER_ENV_VAR_FILE;
int local_ret;
std::string local_env_var;
local_ret = get_env_var_from_file(home_file, env_var_name, local_env_var);
if (local_ret == 0)
{
env_var = local_env_var;
ret = 0;
}
else
{
//
// Try to get it from a host defined file
//
home_file = TANGO_RC_FILE;
local_ret = get_env_var_from_file(home_file, env_var_name, local_env_var);
if (local_ret == 0)
{
env_var = local_env_var;
ret = 0;
}
}
#else
char *env_tango_root;
env_tango_root = getenv(WindowsEnvVariable);
if (env_tango_root != NULL)
{
std::string home_file(env_tango_root);
home_file = home_file + "/" + WINDOWS_ENV_VAR_FILE;
int local_ret;
std::string local_env_var;
local_ret = get_env_var_from_file(home_file, env_var_name, local_env_var);
if (local_ret == 0)
{
env_var = local_env_var;
ret = 0;
}
}
#endif
}
else
{
env_var = env_c_str;
ret = 0;
}
return ret;
}
//-----------------------------------------------------------------------------
//
// Connection::get_env_var_from_file() - Get an environment variable from a file
//
// in : - env_var : The environment variable name
// - f_name : The file name
//
// out : - ret_env_var : The string initialised with the env. variable value
//
// This method returns 0 of the env. variable is found. Otherwise, it returns -1
//
//-----------------------------------------------------------------------------
int Connection::get_env_var_from_file(std::string &f_name, const char *env_var, std::string &ret_env_var)
{
std::ifstream inFile;
std::string file_line;
std::string var(env_var);
int ret = -1;
inFile.open(f_name.c_str());
if (!inFile)
{