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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIFile;
interface nsISocketTransport;
interface nsIProxyInfo;
interface nsIRunnable;

%{C++
class nsASocketHandler;
struct PRFileDesc;
%}

[ptr] native PRFileDescPtr(PRFileDesc);
[ptr] native nsASocketHandlerPtr(nsASocketHandler);

[scriptable, uuid(ad56b25f-e6bb-4db3-9f7b-5b7db33fd2b1)]
interface nsISocketTransportService : nsISupports 
{
    /**
     * Creates a transport for a specified host and port.
     *
     * @param aSocketTypes
     *        array of socket type strings.  null if using default socket type.
     * @param aTypeCount
     *        specifies length of aSocketTypes.
     * @param aHost
     *        specifies the target hostname or IP address literal of the peer
     *        for this socket.
     * @param aPort
     *        specifies the target port of the peer for this socket.
     * @param aProxyInfo
     *        specifies the transport-layer proxy type to use.  null if no
     *        proxy.  used for communicating information about proxies like
     *        SOCKS (which are transparent to upper protocols).
     *
     * @see nsIProxiedProtocolHandler
     * @see nsIProtocolProxyService::GetProxyInfo
     *
     * NOTE: this function can be called from any thread
     */
    nsISocketTransport createTransport([array, size_is(aTypeCount)]
                                       in string aSocketTypes,
                                       in unsigned long aTypeCount,
                                       in AUTF8String aHost,
                                       in long aPort,
                                       in nsIProxyInfo aProxyInfo);

    /**
     * Create a transport built on a Unix domain socket, connecting to the
     * given filename.
     *
     * Since Unix domain sockets are always local to the machine, they are
     * not affected by the nsIIOService's 'offline' flag.
     *
     * On systems that don't support Unix domain sockets at all, this
     * returns NS_ERROR_SOCKET_ADDRESS_NOT_SUPPORTED.
     *
     * The system-level socket API may impose restrictions on the length of
     * the filename that are stricter than those of the underlying
     * filesystem. If the file name is too long, this returns
     * NS_ERROR_FILE_NAME_TOO_LONG.
     *
     * The |aPath| parameter must specify an existing directory entry.
     * Otherwise, this returns NS_ERROR_FILE_NOT_FOUND.
     *
     * The program must have search permission on all components of the
     * path prefix of |aPath|, and read and write permission on |aPath|
     * itself. Without such permission, this returns
     * NS_ERROR_CONNECTION_REFUSED.
     *
     * The |aPath| parameter must refer to a unix-domain socket. Otherwise,
     * this returns NS_ERROR_CONNECTION_REFUSED. (POSIX specifies
     * ECONNREFUSED when "the target address was not listening for
     * connections", and this is what Linux returns.)
     *
     * @param aPath
     *        The file name of the Unix domain socket to which we should
     *        connect.
     */
    nsISocketTransport createUnixDomainTransport(in nsIFile aPath);

    /**
     * Adds a new socket to the list of controlled sockets.
     *
     * This will fail with the error code NS_ERROR_NOT_AVAILABLE if the maximum
     * number of sockets is already reached.
     * In this case, the notifyWhenCanAttachSocket method should be used.
     *
     * @param aFd
     *        Open file descriptor of the socket to control.
     * @param aHandler
     *        Socket handler that will receive notifications when the socket is
     *        ready or detached.
     *
     * NOTE: this function may only be called from an event dispatch on the
     *       socket thread.
     */
    [noscript] void attachSocket(in PRFileDescPtr aFd,
                                 in nsASocketHandlerPtr aHandler);

    /**
     * if the number of sockets reaches the limit, then consumers can be
     * notified when the number of sockets becomes less than the limit.  the
     * notification is asynchronous, delivered via the given nsIRunnable
     * instance on the socket transport thread.
     *
     * @param aEvent
     *        Event that will receive the notification when a new socket can
     *        be attached
     *
     * NOTE: this function may only be called from an event dispatch on the
     *       socket thread.
     */
    [noscript] void notifyWhenCanAttachSocket(in nsIRunnable aEvent);
};