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DlepServiceImpl.cpp
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DlepServiceImpl.cpp
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/*
* Dynamic Link Exchange Protocol (DLEP)
*
* Copyright (C) 2015, 2016, 2018, 2019 Massachusetts Institute of Technology
*/
/// @file
/// class DlepServiceImpl is the library implementation of the DlepService interface.
///
/// The methods in this class are called by the DLEP client to provide
/// information, mostly about destinations, for the DLEP service to
/// convey to its peers using the DLEP protocol.
///
/// The methods in this class are called by the library client, from
/// the client's threads which are distinct from the library's
/// threads. Therefore, any library-owned data that is accessed by
/// these methods needs appropriate locking, both here and anywhere
/// else in the library that accesses the same data.
#include "DlepServiceImpl.h"
#include "DestAdvert.h"
using namespace LLDLEP;
using namespace LLDLEP::internal;
DlepServiceImpl::DlepServiceImpl(DlepPtr dlep, DlepLoggerPtr logger) :
dlep(dlep),
logger(logger)
{
init_thread = Thread(&Dlep::initialize, dlep);
if (! dlep->wait_for_initialization())
{
// clean up the thread before its destructor is called
init_thread.join();
// At this point, we don't have specific information about
// what caused initialization to fail.
throw DlepServiceImpl::InitializationError("see log file");
}
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::destination_up(const DlepMac & mac_address,
const DataItems & data_items)
{
std::ostringstream msg;
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
msg << "mac=" << mac_address;
LOG(DLEP_LOG_INFO, msg);
ReturnStatus rs = ReturnStatus::ok;
if (dlep->dest_advert_enabled)
{
auto advert_db_lock = dlep->dest_advert->advert_db_lock();
auto result = dlep->dest_advert->find_advert_entry(mac_address);
if (result.first)
{
// advert entry for mac_address was found
const DestAdvertDBEntry & entry = result.second;
dlep->dest_advert->update_advert_entry_data_items(mac_address,
data_items);
// If the entry was down, send Destination Up signals to
// the peer and set the entry to up.
if (entry.estate == DestAdvertDBEntry::EntryState::down)
{
for (const DlepMac & dest : entry.info.destinations)
{
dlep->local_pdp->addDestination(dest, data_items, true);
}
dlep->dest_advert->update_advert_entry_state(mac_address,
DestAdvertDBEntry::EntryState::up);
}
else
{
rs = ReturnStatus::destination_exists;
}
}
else
{
// advert entry for mac_address was NOT found
// add a placeholder entry for mac_address
dlep->dest_advert->add_advert_entry(mac_address,
DestAdvertDBEntry(
time(nullptr),
DestAdvertDBEntry::EntryState::up,
true,
DestAdvertInfo(),
data_items));
}
}
else
{
// destination advertisement is not enabled
if (! dlep->local_pdp->addDestination(mac_address, data_items, true))
{
rs = ReturnStatus::destination_exists;
}
}
return rs;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::destination_update(const DlepMac & mac_address,
const DataItems & data_items)
{
std::ostringstream msg;
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
msg << "mac=" << mac_address;
LOG(DLEP_LOG_INFO, msg);
ReturnStatus rs = ReturnStatus::ok;
bool maybe_not_our_mac_address = false;
if (dlep->dest_advert_enabled)
{
auto advert_db_lock = dlep->dest_advert->advert_db_lock();
auto result = dlep->dest_advert->find_advert_entry(mac_address);
if (result.first)
{
// advert entry for mac_address was found
const DestAdvertDBEntry & entry = result.second;
dlep->dest_advert->update_advert_entry_data_items(mac_address,
data_items);
if (entry.estate == DestAdvertDBEntry::EntryState::up)
{
for (const DlepMac & dest : entry.info.destinations)
{
dlep->local_pdp->updateDestination(dest, data_items, true);
}
}
}
else
{
// advert entry for mac_address was NOT found
maybe_not_our_mac_address = true;
}
}
else
{
// destination advertisement is not enabled
if (! dlep->local_pdp->updateDestination(mac_address, data_items, true))
{
maybe_not_our_mac_address = true;
}
}
// It may be that this update is meant for a destination that
// doesn't belong to the local node. See if we can find the peer
// that owns this destination, and if so, send the update to them.
if (maybe_not_our_mac_address)
{
PeerPtr peer = dlep->find_peer(mac_address);
if (peer == nullptr)
{
rs = ReturnStatus::destination_does_not_exist;
msg << "peer for " << mac_address << " was not found";
LOG(DLEP_LOG_ERROR, msg);
}
else
{
peer->destination_update(mac_address, data_items);
}
}
return rs;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::destination_down(const DlepMac & mac_address,
const DataItems & data_items)
{
std::ostringstream msg;
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
msg << "mac=" << mac_address;
LOG(DLEP_LOG_INFO, msg);
bool dest_down_mac_address = true;
ReturnStatus rs = ReturnStatus::ok;
if (dlep->dest_advert_enabled)
{
auto advert_db_lock = dlep->dest_advert->advert_db_lock();
auto result = dlep->dest_advert->find_advert_entry(mac_address);
if (result.first)
{
dest_down_mac_address = false;
// advert entry for mac_address was found
const DestAdvertDBEntry & entry = result.second;
if (entry.estate == DestAdvertDBEntry::EntryState::up)
{
for (const DlepMac & dest : entry.info.destinations)
{
if (! dlep->local_pdp->removeDestination(dest, true,
data_items))
{
msg << "dest advert destination " << dest
<< " was not found";
LOG(DLEP_LOG_ERROR, msg);
rs = ReturnStatus::destination_does_not_exist;
}
}
dlep->dest_advert->update_advert_entry_state(mac_address,
DestAdvertDBEntry::EntryState::down);
}
} // mac_address found in destination advertisements
} // destination advertisement enabled
if (dest_down_mac_address)
{
// Did we originate this mac_address (send the initial Up/Announce)?
if (! dlep->local_pdp->removeDestination(mac_address, true, data_items))
{
// mac_address isn't ours. Try to find its originating peer.
PeerPtr peer = dlep->find_peer(mac_address);
if (peer == nullptr)
{
msg << "peer for " << mac_address << " was not found";
LOG(DLEP_LOG_ERROR, msg);
return ReturnStatus::destination_does_not_exist;
}
else
{
// find_peer() above said that mac_address belongs to peer,
// so this shouldn't fail.
bool ok = peer->remove_destination(mac_address, data_items);
assert(ok);
}
}
}
return rs;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::peer_update(const LLDLEP::DataItems & data_items)
{
std::ostringstream msg;
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
msg << "entered";
LOG(DLEP_LOG_INFO, msg);
std::string err = dlep->local_pdp->update_data_items(data_items, true);
msg << err;
LOG(DLEP_LOG_INFO, msg);
if (err == ProtocolStrings::Success)
{
return ReturnStatus::ok;
}
else
{
return ReturnStatus::invalid_data_item;
}
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::peer_remove_data_items(const DataItems & data_items)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
dlep->local_pdp->remove_data_items(data_items);
return ReturnStatus::ok;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::get_peers(std::vector<std::string> & peers)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
for (auto & it : dlep->peers)
{
PeerPtr p = it.second;
peers.push_back(p->peer_id);
}
return ReturnStatus::ok;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::get_peer_info(const std::string & peer_id,
LLDLEP::PeerInfo & peer_info)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
auto it = dlep->peers.find(peer_id);
if (it == dlep->peers.end())
{
return ReturnStatus::peer_does_not_exist;
}
PeerPtr peer = it->second;
peer->get_info(peer_info);
return ReturnStatus::ok;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::get_destination_info(const std::string & peer_id,
const DlepMac & mac_address,
LLDLEP::DestinationInfo & dest_info)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
auto it = dlep->peers.find(peer_id);
if (it == dlep->peers.end())
{
return ReturnStatus::peer_does_not_exist;
}
PeerPtr peer = it->second;
DestinationDataPtr ddp;
if (! peer->get_destination(mac_address, ddp))
{
return ReturnStatus::destination_does_not_exist;
}
dest_info.mac_address = mac_address;
dest_info.peer_id = peer_id;
dest_info.flags = 0;
ddp->get_all_data_items(dest_info.data_items);
return ReturnStatus::ok;
}
ProtocolConfig *
DlepServiceImpl::get_protocol_config()
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
assert(dlep->protocfg != nullptr);
return dlep->protocfg;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::linkchar_request(const DlepMac & mac_address,
const DataItems & data_items)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
ReturnStatus rs = ReturnStatus::ok;
PeerPtr peer = dlep->find_peer(mac_address);
std::ostringstream msg;
// Destination advertisement should not come into play here
// because this should be the router sending a request to the
// modem, and the router never sees untranslated MAC addresses (RF
// IDs).
if (peer == nullptr)
{
rs = ReturnStatus::peer_does_not_exist;
msg << "peer for " << mac_address << " was not found";
LOG(DLEP_LOG_ERROR, msg);
}
else
{
peer->link_characteristics_request(mac_address, data_items);
}
return rs;
}
DlepServiceImpl::ReturnStatus
DlepServiceImpl::linkchar_reply(const std::string & peer_id,
const DlepMac & mac_address,
const DataItems & data_items)
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
ReturnStatus rs = ReturnStatus::ok;
auto it = dlep->peers.find(peer_id);
if (it == dlep->peers.end())
{
return ReturnStatus::peer_does_not_exist;
}
PeerPtr peer = it->second;
peer->link_characteristics_response(mac_address, data_items);
// XXX should we send destination updates to all of the other peers
// (other than peer)?
if (! dlep->local_pdp->updateDestination(mac_address, data_items, false))
{
rs = ReturnStatus::destination_does_not_exist;
}
return rs;
}
void
DlepServiceImpl::terminate()
{
{
boost::recursive_mutex::scoped_lock lock(dlep->mutex);
std::ostringstream msg;
msg << "entered";
LOG(DLEP_LOG_INFO, msg);
for (auto & it : dlep->peers)
{
PeerPtr p = it.second;
// None of the status codes seem to fit
p->terminate(ProtocolStrings::Success);
}
// Wipe out all of the peers at once
dlep->peers.clear();
// This should shut down all the timers. We don't want any timer
// handlers being called after we've terminated.
dlep->io_service_.stop();
}
// Wait for the DlepService thread to exit.
// This is necessary to make sure the DlepService thread doesn't try to
// access the pointer to its DlepClient object after returning from this
// method. DlepService has no control over the lifetime of its DlepClient,
// and it is very possible that its DlepClient will be deleted soon after
// this method returns.
init_thread.join();
delete dlep;
dlep = nullptr;
}