Commit 85b6fa72 authored by Stephen Morris's avatar Stephen Morris
Browse files

[trac554] Added IOFetch

IOFetch is a general upstream "fetch" class that should be able to
operate over TCP or UDP.  Related changes have been made in the
associated classes.  So far, only the unit tests for a UDP fetch
have been made (and passed).
parent ad418dc7
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......@@ -12,26 +12,28 @@ CLEANFILES = *.gcno *.gcda
# have some code fragments that would hit gcc's unused-parameter warning,
# which would make the build fail with -Werror (our default setting).
libasiolink_la_SOURCES = asiolink.h
libasiolink_la_SOURCES += io_service.h
libasiolink_la_SOURCES += dns_service.h
libasiolink_la_SOURCES += dns_server.h
libasiolink_la_SOURCES += dns_lookup.h
libasiolink_la_SOURCES = asiolink.h
libasiolink_la_SOURCES += dns_answer.h
libasiolink_la_SOURCES += simple_callback.h
libasiolink_la_SOURCES += dns_lookup.h
libasiolink_la_SOURCES += dns_server.h
libasiolink_la_SOURCES += dns_service.h
libasiolink_la_SOURCES += interval_timer.h
libasiolink_la_SOURCES += recursive_query.h
libasiolink_la_SOURCES += io_address.h
libasiolink_la_SOURCES += io_endpoint.h
libasiolink_la_SOURCES += io_error.h
libasiolink_la_SOURCES += io_socket.h
libasiolink_la_SOURCES += io_fetch.h
libasiolink_la_SOURCES += io_message.h
libasiolink_la_SOURCES += io_address.h
libasiolink_la_SOURCES += io_endpoint.h
libasiolink_la_SOURCES += io_service.h
libasiolink_la_SOURCES += io_socket.h
libasiolink_la_SOURCES += recursive_query.h
libasiolink_la_SOURCES += simple_callback.h
libasiolink_la_SOURCES += tcp_endpoint.h
libasiolink_la_SOURCES += tcp_server.h
libasiolink_la_SOURCES += tcp_socket.h
libasiolink_la_SOURCES += udp_endpoint.h
libasiolink_la_SOURCES += udp_server.h
libasiolink_la_SOURCES += udp_socket.h
libasiolink_la_SOURCES += udp_query.h
libasiolink_la_SOURCES += tcp_endpoint.h tcp_socket.h
libasiolink_la_SOURCES += tcp_server.h
libasiolink_la_SOURCES += udp_server.h
libasiolink_la_SOURCES += udp_socket.h
# Note: the ordering matters: -Wno-... must follow -Wextra (defined in
libasiolink_la_CXXFLAGS = $(AM_CXXFLAGS)
......@@ -34,9 +34,6 @@
#include <asiolink/io_socket.h>
#include <asiolink/io_error.h>
#include <asiolink/udp_endpoint.h>
#include <asiolink/udp_socket.h>
/// \namespace asiolink
/// \brief A wrapper interface for the ASIO library.
......@@ -20,7 +20,10 @@
#include <asio.hpp>
#include <asiolink/asiolink.h>
#include <exceptions/exceptions.h>
#include <asiolink/io_address.h>
#include <asiolink/io_error.h>
using namespace asio;
using asio::ip::udp;
......@@ -12,8 +12,8 @@
#ifndef __IOADDRESS_H
#define __IOADDRESS_H 1
#ifndef __IO_ADDRESS_H
#define __IO_ADDRESS_H 1
// IMPORTANT NOTE: only very few ASIO headers files can be included in
// this file. In particular, asio.hpp should never be included here.
......@@ -120,7 +120,7 @@ private:
} // asiolink
#endif // __IOADDRESS_H
#endif // __IO_ADDRESS_H
// Local Variables:
// mode: c++
// Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
#ifndef __IO_ASIO_SOCKET_H
#define __IO_ASIO_SOCKET_H 1
// IMPORTANT NOTE: only very few ASIO headers files can be included in
// this file. In particular, asio.hpp should never be included here.
// See the description of the namespace below.
#include <unistd.h> // for some network system calls
#include <functional>
#include <string>
#include <exceptions/exceptions.h>
#include <coroutine.h>
#include <asiolink/io_error.h>
#include <asiolink/io_socket.h>
#include <asiolink/io_completion_cb.h>
using namespace asio;
namespace asiolink {
/// \brief Socket not open
/// Thrown on an attempt to do read/write to a socket that is not open.
class SocketNotOpen : public IOError {
SocketNotOpen(const char* file, size_t line, const char* what) :
IOError(file, line, what) {}
/// Forward declaration of an IOEndpoint
class IOEndpoint;
/// \brief I/O Socket with asynchronous operations
/// This class is a wrapper for the ASIO socket classes such as
/// \c ip::tcp::socket and \c ip::udp::socket.
/// This is the basic IOSocket with additional operations - open, send, receive
/// and close. Depending on how the asiolink code develops, it may be a
/// temporary class: its main use is to add the template parameter needed for
/// the derived classes UDPSocket and TCPSocket but without changing the
/// signature of the more basic IOSocket class.
/// We may revisit this decision when we generalize the wrapper and more
/// modules use it. Also, at that point we may define a separate (visible)
/// derived class for testing purposes rather than providing factory methods
/// (i.e., getDummy variants below).
/// TODO: Check if IOAsioSocket class is still needed
/// \param C Template parameter identifying type of the callback object.
template <typename C>
class IOAsioSocket : public IOSocket {
/// \name Constructors and Destructor
/// Note: The copy constructor and the assignment operator are
/// intentionally defined as private, making this class non-copyable.
IOAsioSocket(const IOAsioSocket<C>& source);
IOAsioSocket& operator=(const IOAsioSocket<C>& source);
/// \brief The default constructor.
/// This is intentionally defined as \c protected as this base class
/// should never be instantiated (except as part of a derived class).
IOAsioSocket() {}
/// The destructor.
virtual ~IOAsioSocket() {}
/// \brief Return the "native" representation of the socket.
/// In practice, this is the file descriptor of the socket for
/// UNIX-like systems so the current implementation simply uses
/// \c int as the type of the return value.
/// We may have to need revisit this decision later.
/// In general, the application should avoid using this method;
/// it essentially discloses an implementation specific "handle" that
/// can change the internal state of the socket (consider the
/// application closes it, for example).
/// But we sometimes need to perform very low-level operations that
/// requires the native representation. Passing the file descriptor
/// to a different process is one example.
/// This method is provided as a necessary evil for such limited purposes.
/// This method never throws an exception.
/// \return The native representation of the socket. This is the socket
/// file descriptor for UNIX-like systems.
virtual int getNative() const = 0;
/// \brief Return the transport protocol of the socket.
/// Currently, it returns \c IPPROTO_UDP for UDP sockets, and
/// \c IPPROTO_TCP for TCP sockets.
/// This method never throws an exception.
/// \return IPPROTO_UDP for UDP sockets
/// \return IPPROTO_TCP for TCP sockets
virtual int getProtocol() const = 0;
/// \brief Open AsioSocket
/// A call that is a no-op on UDP sockets, this opens a connection to the
/// system identified by the given endpoint.
/// \param endpoint Pointer to the endpoint object. This is ignored for
/// a UDP socket (the target is specified in the send call), but should
/// be of type TCPEndpoint for a TCP connection.
/// \param callback I/O Completion callback, called when the connect has
/// completed. In the stackless coroutines model, this will be the
/// method containing the call to this function, allowing the operation to
/// resume after the socket open has completed.
/// \return true if an asynchronous operation was started and the caller
/// should yield and wait for completion, false if not. (i.e. The UDP
/// derived class will return false, the TCP class will return true). This
/// optimisation avoids the overhead required to post a callback to the
/// I/O Service queue where nothing is done.
virtual bool open(const IOEndpoint* endpoint, C& callback) = 0;
/// \brief Send Asynchronously
/// This corresponds to async_send_to() for UDP sockets and async_send()
/// for TCP. In both cases an endpoint argument is supplied indicating the
/// target of the send - this is ignored for TCP.
/// \param data Data to send
/// \param length Length of data to send
/// \param endpoint Target of the send
/// \param callback Callback object.
virtual void asyncSend(const void* data, size_t length,
const IOEndpoint* endpoint, C& callback) = 0;
/// \brief Receive Asynchronously
/// This correstponds to async_receive_from() for UDP sockets and