SC::AsyncSocketReceive Struct Reference

Starts a socket receive operation, receiving bytes from a remote endpoint. More...

#include <Async.h>

Inheritance diagram for SC::AsyncSocketReceive:

Classes
struct	CompletionData
	Completion data for AsyncSocketReceive. More...
struct	Result
	Callback result for AsyncSocketReceive. More...

Public Member Functions
SC::Result	start (AsyncEventLoop &eventLoop, const SocketDescriptor &socketDescriptor, Span< char > data)
	Starts a socket receive operation. More...
SC::Result	start (AsyncEventLoop &eventLoop)
	Starts a socket receive operation. More...
Public Member Functions inherited from SC::AsyncRequest
void	setDebugName (const char *newDebugName)
AsyncEventLoop *	getEventLoop () const
	Get the event loop associated with this AsyncRequest. More...
void	cacheInternalEventLoop (AsyncEventLoop &loop)
	Caches the event loop associated with this AsyncRequest. More...
	AsyncRequest (Type type)
	Constructs a free async request of given type. More...
Result	stop ()
	Stops the async operation. More...
bool	isFree () const

Public Attributes
Function< void(Result &)>	callback
	Called after data has been received. More...
Span< char >	buffer
	The writeable span of memory where to data will be written. More...
SocketDescriptor::Handle	handle = SocketDescriptor::Invalid
Public Attributes inherited from SC::AsyncRequest
AsyncRequest *	next = nullptr
AsyncRequest *	prev = nullptr

Additional Inherited Members
Public Types inherited from SC::AsyncRequest
enum class	Type : uint8_t {   LoopTimeout ,   LoopWakeUp ,   LoopWork ,   ProcessExit ,   SocketAccept ,   SocketConnect ,   SocketSend ,   SocketReceive ,   SocketClose ,   FileRead ,   FileWrite ,   FileClose ,   FilePoll }
	Type of async request. More...
Protected Member Functions inherited from SC::AsyncRequest
Result	validateAsync ()
Result	queueSubmission (AsyncEventLoop &eventLoop)
Result	queueSubmission (AsyncEventLoop &eventLoop, ThreadPool &threadPool, AsyncTask &task)
Protected Attributes inherited from SC::AsyncRequest
AsyncEventLoop *	eventLoop = nullptr
AsyncTask *	asyncTask = nullptr

Detailed Description

Starts a socket receive operation, receiving bytes from a remote endpoint.

Callback will be called when some data is read from socket.
Socket library can be used to create a Socket but the socket should be created with SC::SocketFlags::NonBlocking and associated to the event loop with SC::AsyncEventLoop::associateExternallyCreatedTCPSocket or though AsyncSocketAccept.
Alternatively SC::AsyncEventLoop::createAsyncTCPSocket creates and associates the socket to the loop.

Additional notes:

• SC::AsyncSocketReceive::CompletionData::disconnected will be set to true when client disconnects

// Assuming an already created (and running) AsyncEventLoop named `eventLoop`
// and a connected or accepted socket named `client`
// ...
char receivedData[100] = {0}; // A buffer to hold data read from the socket
AsyncSocketReceive receiveAsync;
receiveAsync.callback = [&](AsyncSocketReceive::Result& res)
{
    Span<char> readData;
    if(res.get(readData))
    {
        if(res.completionData.disconnected)
        {
            // Last callback invocation done when other side of the socket has disconnected.
            // - completionData.disconnected is == true
            // - readData.sizeInBytes() is == 0
            console.print("Client disconnected");
        }
        else
        {
            // readData is a slice of receivedData with the received bytes
            console.print("{} bytes have been read", readData.sizeInBytes());
            
            // IMPORTANT: Reactivate the request to receive more data
            res.reactivateRequest(true);
        }
    }
    else
    {
        // Some error occurred, check res.returnCode
    }
};
SC_TRY(receiveAsync.start(eventLoop, client, {receivedData, sizeof(receivedData)}));

Member Function Documentation

start() [1/2]

SC::Result SC::AsyncSocketReceive::start

(

AsyncEventLoop &

eventLoop

)

Starts a socket receive operation.

Callback will be called when some data is read from socket.

Parameters

eventLoop

The event loop where queuing this async request

Returns

Valid Result if the request has been successfully queued

Note

Remeber to fill AsyncSocketReceive::buffer and AsyncSocketReceive::handle before calling start

start() [2/2]

SC::Result SC::AsyncSocketReceive::start	(	AsyncEventLoop &	eventLoop,
		const SocketDescriptor &	socketDescriptor,
		Span< char >	data
	)

Starts a socket receive operation.

Callback will be called when some data is read from socket.

Parameters

eventLoop	The event loop where queuing this async request
socketDescriptor	The socket from which to receive data
data	Span of memory where to write received bytes

Returns

Valid Result if the request has been successfully queued

Member Data Documentation

buffer

Span<char> SC::AsyncSocketReceive::buffer

The writeable span of memory where to data will be written.

callback

Function<void(Result&)> SC::AsyncSocketReceive::callback

Called after data has been received.

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The documentation for this struct was generated from the following file:

• Async.h