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https://github.com/gnif/LookingGlass.git
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12801df353
Carry every input activation and report through its client-bound SPSC stream. Keep the LGMP queue only for status publication and subscriber discovery, removing transport selection and the queue-report fallback. Retain graceful endpoint draining when a subscriber disappears and use bounded adaptive polling while streams are active. The IDD polling setup remains compatible with the project’s current C++ language mode.
137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include "Atomic.h"
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#include "CSRWLock.h"
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#include "transport/IInputSource.h"
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#include "common/KVMFRInput.h"
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#include "common/LGMPConfig.h"
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#include <Windows.h>
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#include <stdint.h>
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extern "C" {
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#include "lgmp/host.h"
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#include "lgmp/stream.h"
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}
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class CLGMPHost;
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class IInputTarget;
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class CLGMPInputTransport final : public IInputSource
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{
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private:
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static constexpr ULONGLONG OWNER_LEASE_MS = 500;
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static constexpr ULONGLONG LOG_INTERVAL_MS = 5000;
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static constexpr unsigned DRAIN_LIMIT = 256;
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struct StreamEndpoint
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{
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PLGMPHostStream stream;
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LGMPStreamDescriptor descriptor;
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uint32_t clientID;
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uint32_t epoch;
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bool draining;
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};
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struct Statistics
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{
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ULONGLONG lastLog;
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uint64_t messages;
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uint64_t reports;
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uint64_t drainLimit;
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uint64_t malformedSize;
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uint64_t malformedMessage;
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uint64_t sequenceErrors;
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uint64_t nonOwner;
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uint64_t deliveryFailures;
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uint64_t claims;
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uint64_t releases;
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unsigned maxDrain;
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};
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CLGMPHost& m_host;
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PLGMPHostQueue m_queue = nullptr;
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PLGMPMemory m_statusMemory[LGMP_Q_INPUT_LEN] = {};
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StreamEndpoint m_streamEndpoint[
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KVMFR_INPUT_STREAM_ENDPOINT_COUNT] = {};
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IInputTarget * m_target = nullptr;
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CSRWLock m_lifecycleLock;
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CSRWLock m_statusLock;
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CSRWLock m_streamLock;
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HANDLE m_stopEvent = nullptr;
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HANDLE m_pollTimer = nullptr;
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HANDLE m_thread = nullptr;
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uint32_t m_ownerClientID = 0;
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uint32_t m_ownerGeneration = 0;
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uint32_t m_ownerSequence = 0;
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ULONGLONG m_ownerDeadline = 0;
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InputTargetState m_targetState;
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uint32_t m_endpointGeneration = 0;
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uint32_t m_streamGeneration = 0;
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unsigned m_streamDrainCursor = 0;
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uint32_t m_statusSerial = 0;
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bool m_statusDirty = false;
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std::atomic<bool> m_statusFailed = false;
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Statistics m_statistics = {};
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bool Initialize();
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void DeInit();
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bool ReconcileStreams(bool& changed);
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void ResetStreams();
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InputSourceId Owner() const;
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void UpdateTargetState(const InputTargetState& state);
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bool PublishStatus();
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void FlushStatus();
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void LogStatistics(ULONGLONG now);
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bool DrainStreamMessages(bool& received);
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bool ProcessMessage(uint32_t sourceClientID,
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const KVMFRInputMessage& message);
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bool ValidatePayload(const KVMFRInputMessage& message) const;
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bool IsOwner(uint32_t sourceClientID, uint32_t generation) const;
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bool Claim(uint32_t sourceClientID,
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const KVMFRInputMessage& message);
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void RenewLease();
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void ReleaseOwner(bool reset);
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void CheckOwner();
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void Thread();
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static DWORD CALLBACK ThreadProc(void * context);
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friend class CLGMPTransport;
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public:
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explicit CLGMPInputTransport(CLGMPHost& host) :
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m_host(host) {}
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~CLGMPInputTransport() override;
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CLGMPInputTransport(const CLGMPInputTransport&) = delete;
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CLGMPInputTransport& operator=(const CLGMPInputTransport&) = delete;
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bool Start(IInputTarget& target) override;
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void Stop() override;
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};
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