mirror of
https://github.com/kidfromjupiter/nearby.git
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Alexey Polyudov
204f76077d
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec
113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
#ifndef CORE_INTERNAL_BASE_ENDPOINT_CHANNEL_H_
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#define CORE_INTERNAL_BASE_ENDPOINT_CHANNEL_H_
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#include <cstdint>
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#include "core/internal/endpoint_channel.h"
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#include "platform/api/atomic_boolean.h"
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#include "platform/api/atomic_reference.h"
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#include "platform/api/condition_variable.h"
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#include "platform/api/input_stream.h"
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#include "platform/api/lock.h"
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#include "platform/api/output_stream.h"
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#include "platform/api/system_clock.h"
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#include "platform/byte_array.h"
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#include "platform/port/string.h"
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#include "platform/ptr.h"
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#include "proto/connections_enums.pb.h"
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#include "securegcm/d2d_connection_context_v1.h"
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namespace location {
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namespace nearby {
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namespace connections {
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template <typename Platform>
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class BaseEndpointChannel : public EndpointChannel {
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public:
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BaseEndpointChannel(const string& channel_name, Ptr<InputStream> reader,
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Ptr<OutputStream> writer);
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~BaseEndpointChannel() override;
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ExceptionOr<ConstPtr<ByteArray> > read() override;
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Exception::Value write(ConstPtr<ByteArray> data) override;
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// Closes this EndpointChannel, without tracking the closure in analytics.
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void close() override;
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// Closes this EndpointChannel and records the closure with the given reason.
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void close(proto::connections::DisconnectionReason reason) override;
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// Returns a one-word type descriptor for the concrete EndpointChannel
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// implementation that can be used in log messages; eg: BLUETOOTH, BLE,
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// WIFI.
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string getType() override;
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// Returns the name of the EndpointChannel.
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string getName() override;
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// Enables encryption on the EndpointChannel.
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void enableEncryption(
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Ptr<securegcm::D2DConnectionContextV1> encryption_context) override;
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// True if the EndpointChannel is currently pausing all writes.
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bool isPaused() override;
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// Pauses all writes on this EndpointChannel until resume() is called.
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void pause() override;
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// Resumes any writes on this EndpointChannel that were suspended when pause()
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// was called.
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void resume() override;
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// Returns the timestamp (in elapsedRealtime) of the last read from this
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// endpoint, or -1 if no reads have occurred.
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std::int64_t getLastReadTimestamp() override;
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protected:
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virtual void closeImpl() = 0;
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private:
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// Used to sanity check that our frame sizes are reasonable.
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static const std::int32_t kMaxAllowedReadBytes = 1048576; // 1MB
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bool isEncryptionEnabled();
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void unblockPausedWriter();
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void blockUntilUnpaused();
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volatile std::int64_t last_read_timestamp_;
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const string channel_name_;
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ScopedPtr<Ptr<SystemClock> > system_clock_;
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// The reader and writer are synchronized independently since we can't have
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// writes waiting on reads that might potentially block forever.
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ScopedPtr<Ptr<Lock> > reader_lock_;
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// Not owned by this class, see the note in the destructor for a special
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// restriction on usage.
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Ptr<InputStream> reader_;
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ScopedPtr<Ptr<Lock> > writer_lock_;
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// Not owned by this class, see the note in the destructor for a special
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// restriction on usage.
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Ptr<OutputStream> writer_;
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// An encryptor/decryptor. May be null.
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ScopedPtr<Ptr<AtomicReference<Ptr<securegcm::D2DConnectionContextV1> > > >
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encryption_context_;
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ScopedPtr<Ptr<Lock> > is_paused_lock_;
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ScopedPtr<Ptr<ConditionVariable> > is_paused_condition_variable_;
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// If true, writes should block until this has been set to false.
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ScopedPtr<Ptr<AtomicBoolean> > is_paused_;
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};
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} // namespace connections
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} // namespace nearby
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} // namespace location
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#include "core/internal/base_endpoint_channel.cc"
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#endif // CORE_INTERNAL_BASE_ENDPOINT_CHANNEL_H_
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