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// $Id$
#define ACE_BUILD_SVC_DLL
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_unistd.h"
#include "ace/Service_Config.h"
#include "ace/Signal.h"
#include "ace/Truncate.h"
#include "Config_Files.h"
#include "Event_Channel.h"
#include "Gateway.h"
class ACE_Svc_Export Gateway : public ACE_Service_Object
{
// = TITLE
// Integrates the whole Gateway application.
//
// = DESCRIPTION
// This implementation uses the <Event_Channel> as the basis
// for the <Gateway> routing.
protected:
// = Service configurator hooks.
virtual int init (int argc, ACE_TCHAR *argv[]);
// Perform initialization.
virtual int fini (void);
// Perform termination when unlinked dynamically.
virtual int info (ACE_TCHAR **, size_t) const;
// Return info about this service.
// = Configuration methods.
int parse_connection_config_file (void);
// Parse the proxy configuration file.
int parse_consumer_config_file (void);
// Parse the consumer configuration file.
// = Lifecycle management methods.
int handle_input (ACE_HANDLE);
// Shut down the Gateway when input comes in from the controlling
// console.
int handle_signal (int signum, siginfo_t * = 0, ucontext_t * = 0);
// Shut down the Gateway when a signal arrives.
Event_Channel event_channel_;
// The Event Channel routes events from Supplier(s) to Consumer(s)
// using <Supplier_Handler> and <Consumer_Handler> objects.
Connection_Handler_Factory connection_handler_factory_;
// Creates the appropriate type of <Connection_Handlers>.
};
int
Gateway::handle_signal (int signum, siginfo_t *, ucontext_t *)
{
ACE_UNUSED_ARG (signum);
// Shut down the main event loop.
ACE_Reactor::end_event_loop ();
return 0;
}
int
Gateway::handle_input (ACE_HANDLE h)
{
char buf[BUFSIZ];
// Consume the input...
ACE_OS::read (h, buf, sizeof (buf));
// Shut us down.
return this->handle_signal (ACE_Utils::truncate_cast<int> ((intptr_t)h));
}
int
Gateway::init (int argc, ACE_TCHAR *argv[])
{
// Parse the "command-line" arguments.
Options::instance ()->parse_args (argc, argv);
ACE_Sig_Set sig_set;
sig_set.sig_add (SIGINT);
sig_set.sig_add (SIGQUIT);
// Register ourselves to receive signals so we can shut down
// gracefully.
if (ACE_Reactor::instance ()->register_handler (sig_set,
this) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%t) %p\n"),
ACE_TEXT ("register_handler")),
-1);
// Register this handler to receive events on stdin. We use this to
// shutdown the Gateway gracefully.
if (ACE_Event_Handler::register_stdin_handler (this,
ACE_Reactor::instance (),
ACE_Thread_Manager::instance ()) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%t) %p\n"),
ACE_TEXT ("register_stdin_handler")),
-1);
// If this->performance_window_ > 0 start a timer.
if (Options::instance ()->performance_window () > 0)
{
ACE_Time_Value const performance_time (Options::instance ()->performance_window ());
if (ACE_Reactor::instance ()->schedule_timer
(&this->event_channel_, 0,
performance_time) == -1)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%t) %p\n"),
ACE_TEXT ("schedule_timer")));
else
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("starting timer for %d seconds...\n"),
Options::instance ()->performance_window ()));
}
// Are we running as a connector?
if (Options::instance ()->enabled
(Options::CONSUMER_CONNECTOR | Options::SUPPLIER_CONNECTOR))
{
// Parse the proxy configuration file.
this->parse_connection_config_file ();
// Parse the consumer config file and build the event forwarding
// discriminator.
this->parse_consumer_config_file ();
}
// Initialize the Event_Channel.
return this->event_channel_.open ();
}
// This method is automatically called when the Gateway is shutdown.
int
Gateway::fini (void)
{
// Remove the handler that receive events on stdin. Otherwise, we
// will crash on shutdown.
ACE_Event_Handler::remove_stdin_handler (ACE_Reactor::instance (),
ACE_Thread_Manager::instance ());
// Close down the event channel.
this->event_channel_.close ();
// Need to make sure we cleanup this Singleton.
delete Options::instance ();
return 0;
}
// Returns information on the currently active service.
int
Gateway::info (ACE_TCHAR **strp, size_t length) const
{
ACE_TCHAR buf[BUFSIZ];
ACE_OS::strcpy
(buf, ACE_TEXT ("Gateway daemon\t # Application-level gateway\n"));
if (*strp == 0 && (*strp = ACE_OS::strdup (buf)) == 0)
return -1;
else
ACE_OS::strncpy (*strp, buf, length);
return ACE_OS::strlen (buf);
}
// Parse and build the proxy table.
int
Gateway::parse_connection_config_file (void)
{
// File that contains the proxy configuration information.
Connection_Config_File_Parser connection_file;
int file_empty = 1;
int line_number = 0;
if (connection_file.open (Options::instance ()->connection_config_file ()) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%t) %p\n"),
Options::instance ()->connection_config_file ()),
-1);
// Keep track of the previous connection id to make sure the
// connection config file isn't corrupted.
int previous_connection_id = 0;
// Read config file one line at a time.
for (Connection_Config_Info pci;
connection_file.read_entry (pci, line_number) != FPRT::RT_EOFILE;
)
{
file_empty = 0;
// First time in check.
if (previous_connection_id == 0)
{
previous_connection_id = 1;
if (pci.connection_id_ != 1)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) warning, the first connection id should be 1 not %d\n"),
pci.connection_id_));
}
else if (previous_connection_id + 1 != pci.connection_id_)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) warning, connection ids should keep increasing by 1 and %d + 1 != %d\n"),
previous_connection_id,
pci.connection_id_));
// Update the last connection id to ensure that we monotonically
// increase by 1.
previous_connection_id = pci.connection_id_;
if (Options::instance ()->enabled (Options::DEBUGGING))
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) conn id = %d, ")
ACE_TEXT ("host = %s, ")
ACE_TEXT ("remote port = %d, ")
ACE_TEXT ("proxy role = %c, ")
ACE_TEXT ("max retry timeout = %d, ")
ACE_TEXT ("local port = %d, ")
ACE_TEXT ("priority = %d\n"),
pci.connection_id_,
pci.host_,
pci.remote_port_,
pci.connection_role_,
pci.max_retry_timeout_,
pci.local_port_,
pci.priority_));
pci.event_channel_ = &this->event_channel_;
// Create the appropriate type of Proxy.
Connection_Handler *connection_handler;
ACE_ALLOCATOR_RETURN (connection_handler,
this->connection_handler_factory_.make_connection_handler (pci),
-1);
// Bind the new Connection_Handler to the connection ID.
this->event_channel_.bind_proxy (connection_handler);
}
// Keep track of the next available connection id, which is
// necessary for Peers that connect with us, rather than vice versa.
Options::instance ()->connection_id () = previous_connection_id + 1;
if (file_empty)
ACE_ERROR ((LM_WARNING,
ACE_TEXT ("warning: connection connection_handler configuration file was empty\n")));
return 0;
}
int
Gateway::parse_consumer_config_file (void)
{
// File that contains the consumer event forwarding information.
Consumer_Config_File_Parser consumer_file;
int file_empty = 1;
int line_number = 0;
if (consumer_file.open (Options::instance ()->consumer_config_file ()) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%t) %p\n"),
Options::instance ()->consumer_config_file ()),
-1);
// Read config file line at a time.
for (Consumer_Config_Info cci_entry;
consumer_file.read_entry (cci_entry, line_number) != FPRT::RT_EOFILE;
)
{
file_empty = 0;
if (Options::instance ()->enabled (Options::DEBUGGING))
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) connection id = %d, payload = %d, ")
ACE_TEXT ("number of consumers = %d\n"),
cci_entry.connection_id_,
cci_entry.type_,
cci_entry.total_consumers_));
for (int i = 0; i < cci_entry.total_consumers_; i++)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) destination[%d] = %d\n"),
i,
cci_entry.consumers_[i]));
}
Consumer_Dispatch_Set *dispatch_set;
ACE_NEW_RETURN (dispatch_set,
Consumer_Dispatch_Set,
-1);
Event_Key event_addr (cci_entry.connection_id_,
cci_entry.type_);
// Add the Consumers to the Dispatch_Set.
for (int i = 0; i < cci_entry.total_consumers_; i++)
{
Connection_Handler *connection_handler = 0;
// Lookup destination and add to Consumer_Dispatch_Set set
// if found.
if (this->event_channel_.find_proxy (cci_entry.consumers_[i],
connection_handler) != -1)
dispatch_set->insert (connection_handler);
else
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%t) not found: destination[%d] = %d\n"),
i,
cci_entry.consumers_[i]));
}
this->event_channel_.subscribe (event_addr, dispatch_set);
}
if (file_empty)
ACE_ERROR ((LM_WARNING,
ACE_TEXT ("warning: consumer map configuration file was empty\n")));
return 0;
}
// The following is a "Factory" used by the ACE_Service_Config and
// svc.conf file to dynamically initialize the state of the Gateway.
ACE_SVC_FACTORY_DEFINE (Gateway)
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