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#include <iwp/linklayer.hpp>
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#include <iwp/session.hpp>
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#include <config/key_manager.hpp>
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#include <memory>
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#include <unordered_set>
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namespace llarp
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{
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namespace iwp
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{
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LinkLayer::LinkLayer(
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std::shared_ptr<KeyManager> keyManager,
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GetRCFunc getrc,
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LinkMessageHandler h,
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SignBufferFunc sign,
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SessionEstablishedHandler est,
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SessionRenegotiateHandler reneg,
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TimeoutHandler timeout,
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SessionClosedHandler closed,
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PumpDoneHandler pumpDone,
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WorkerFunc_t worker,
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bool allowInbound)
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: ILinkLayer(keyManager, getrc, h, sign, est, reneg, timeout, closed, pumpDone, worker)
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, permitInbound{allowInbound}
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{
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}
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LinkLayer::~LinkLayer() = default;
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const char*
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LinkLayer::Name() const
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{
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return "iwp";
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}
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uint16_t
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LinkLayer::Rank() const
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{
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return 2;
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}
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void
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LinkLayer::RecvFrom(const SockAddr& from, ILinkSession::Packet_t pkt)
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{
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std::shared_ptr<ILinkSession> session;
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auto itr = m_AuthedAddrs.find(from);
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bool isNewSession = false;
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if (itr == m_AuthedAddrs.end())
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{
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De-abseil, part 2: mutex, locks, (most) time
- util::Mutex is now a std::shared_timed_mutex, which is capable of
exclusive and shared locks.
- util::Lock is still present as a std::lock_guard<util::Mutex>.
- the locking annotations are preserved, but updated to the latest
supported by clang rather than using abseil's older/deprecated ones.
- ACQUIRE_LOCK macro is gone since we don't pass mutexes by pointer into
locks anymore (WTF abseil).
- ReleasableLock is gone. Instead there are now some llarp::util helper
methods to obtain unique and/or shared locks:
- `auto lock = util::unique_lock(mutex);` gets an RAII-but-also
unlockable object (std::unique_lock<T>, with T inferred from
`mutex`).
- `auto lock = util::shared_lock(mutex);` gets an RAII shared (i.e.
"reader") lock of the mutex.
- `auto lock = util::unique_locks(mutex1, mutex2, mutex3);` can be
used to atomically lock multiple mutexes at once (returning a
tuple of the locks).
This are templated on the mutex which makes them a bit more flexible
than using a concrete type: they can be used for any type of lockable
mutex, not only util::Mutex. (Some of the code here uses them for
getting locks around a std::mutex). Until C++17, using the RAII types
is painfully verbose:
```C++
// pre-C++17 - needing to figure out the mutex type here is annoying:
std::unique_lock<util::Mutex> lock(mutex);
// pre-C++17 and even more verbose (but at least the type isn't needed):
std::unique_lock<decltype(mutex)> lock(mutex);
// our compromise:
auto lock = util::unique_lock(mutex);
// C++17:
std::unique_lock lock(mutex);
```
All of these functions will also warn (under gcc or clang) if you
discard the return value. You can also do fancy things like
`auto l = util::unique_lock(mutex, std::adopt_lock)` (which lets a
lock take over an already-locked mutex).
- metrics code is gone, which also removes a big pile of code that was
only used by metrics:
- llarp::util::Scheduler
- llarp::thread::TimerQueue
- llarp::util::Stopwatch
4 years ago
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Lock_t lock(m_PendingMutex);
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if (m_Pending.count(from) == 0)
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{
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if (not permitInbound)
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return;
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isNewSession = true;
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m_Pending.insert({from, std::make_shared<Session>(this, from)});
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}
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session = m_Pending.find(from)->second;
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}
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else
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{
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De-abseil, part 2: mutex, locks, (most) time
- util::Mutex is now a std::shared_timed_mutex, which is capable of
exclusive and shared locks.
- util::Lock is still present as a std::lock_guard<util::Mutex>.
- the locking annotations are preserved, but updated to the latest
supported by clang rather than using abseil's older/deprecated ones.
- ACQUIRE_LOCK macro is gone since we don't pass mutexes by pointer into
locks anymore (WTF abseil).
- ReleasableLock is gone. Instead there are now some llarp::util helper
methods to obtain unique and/or shared locks:
- `auto lock = util::unique_lock(mutex);` gets an RAII-but-also
unlockable object (std::unique_lock<T>, with T inferred from
`mutex`).
- `auto lock = util::shared_lock(mutex);` gets an RAII shared (i.e.
"reader") lock of the mutex.
- `auto lock = util::unique_locks(mutex1, mutex2, mutex3);` can be
used to atomically lock multiple mutexes at once (returning a
tuple of the locks).
This are templated on the mutex which makes them a bit more flexible
than using a concrete type: they can be used for any type of lockable
mutex, not only util::Mutex. (Some of the code here uses them for
getting locks around a std::mutex). Until C++17, using the RAII types
is painfully verbose:
```C++
// pre-C++17 - needing to figure out the mutex type here is annoying:
std::unique_lock<util::Mutex> lock(mutex);
// pre-C++17 and even more verbose (but at least the type isn't needed):
std::unique_lock<decltype(mutex)> lock(mutex);
// our compromise:
auto lock = util::unique_lock(mutex);
// C++17:
std::unique_lock lock(mutex);
```
All of these functions will also warn (under gcc or clang) if you
discard the return value. You can also do fancy things like
`auto l = util::unique_lock(mutex, std::adopt_lock)` (which lets a
lock take over an already-locked mutex).
- metrics code is gone, which also removes a big pile of code that was
only used by metrics:
- llarp::util::Scheduler
- llarp::thread::TimerQueue
- llarp::util::Stopwatch
4 years ago
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Lock_t lock(m_AuthedLinksMutex);
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auto range = m_AuthedLinks.equal_range(itr->second);
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session = range.first->second;
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}
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if (session)
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{
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bool success = session->Recv_LL(std::move(pkt));
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if (!success and isNewSession)
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{
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LogWarn("Brand new session failed; removing from pending sessions list");
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m_Pending.erase(m_Pending.find(from));
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}
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}
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}
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bool
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LinkLayer::MapAddr(const RouterID& r, ILinkSession* s)
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{
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if (!ILinkLayer::MapAddr(r, s))
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return false;
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m_AuthedAddrs.emplace(s->GetRemoteEndpoint(), r);
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return true;
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}
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void
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LinkLayer::UnmapAddr(const IpAddress& addr)
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{
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m_AuthedAddrs.erase(addr);
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}
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std::shared_ptr<ILinkSession>
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LinkLayer::NewOutboundSession(const RouterContact& rc, const AddressInfo& ai)
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{
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return std::make_shared<Session>(this, rc, ai);
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}
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} // namespace iwp
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} // namespace llarp
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