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46ad8d4058
- includes are now sorted in consistent, logical order; first step in an attempt to fix the tomfoolery (no relation to Tom) brought in by include-what-you-use - shuffled around some cmake linking to simplify dependency graph - superfluous files removed
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
#include "../util/buffer.hpp"
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#include "ev.hpp"
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namespace llarp
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{
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// Base type for UDP handling; constructed via EventLoop::make_udp().
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struct UDPHandle
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{
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using ReceiveFunc = EventLoop::UDPReceiveFunc;
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// Starts listening for incoming UDP packets on the given address. Returns true on success,
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// false if the address could not be bound. If you send without calling this first then the
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// socket will bind to a random high port on 0.0.0.0 (the "all addresses" address).
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virtual bool
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listen(const SockAddr& addr) = 0;
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// Sends a packet to the given recipient, immediately. Returns true if the send succeeded,
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// false it could not be performed (either because of error, or because it would have blocked).
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// If listen hasn't been called then a random IP/port will be used.
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virtual bool
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send(const SockAddr& dest, const llarp_buffer_t& buf) = 0;
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// Closes the listening UDP socket (if opened); this is typically called (automatically) during
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// destruction. Does nothing if the UDP socket is already closed.
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virtual void
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close() = 0;
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// Returns the file descriptor of the socket, if available. This generally exists only after
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// listen() has been called, and never exists on Windows.
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virtual std::optional<int>
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file_descriptor()
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{
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return std::nullopt;
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}
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/// returns the local address we are bound on
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virtual std::optional<SockAddr>
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LocalAddr() const = 0;
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// Base class destructor
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virtual ~UDPHandle() = default;
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protected:
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explicit UDPHandle(ReceiveFunc on_recv) : on_recv{std::move(on_recv)}
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{
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// It makes no sense at all to use this with a null receive function:
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assert(this->on_recv);
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}
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// Callback to invoke when data is received
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ReceiveFunc on_recv;
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};
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} // namespace llarp
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