// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Use the <code>chrome.socket</code> API to send and receive data over the
// network using TCP and UDP connections.
namespace socket {
  enum SocketType {
    tcp,
    udp
  };

  // The socket options.
  dictionary CreateOptions {
  };

  dictionary CreateInfo {
    // The id of the newly created socket.
    long socketId;
  };

  callback CreateCallback = void (CreateInfo createInfo);

  callback ConnectCallback = void (long result);

  callback BindCallback = void (long result);

  callback ListenCallback = void (long result);

  dictionary AcceptInfo {
    long resultCode;
    // The id of the accepted socket.
    long? socketId;
  };

  callback AcceptCallback = void (AcceptInfo acceptInfo);

  dictionary ReadInfo {
    // The resultCode returned from the underlying read() call.
    long resultCode;

    ArrayBuffer data;
  };

  callback ReadCallback = void (ReadInfo readInfo);

  dictionary WriteInfo {
    // The number of bytes sent, or a negative error code.
    long bytesWritten;
  };

  callback WriteCallback = void (WriteInfo writeInfo);

  dictionary RecvFromInfo {
    // The resultCode returned from the underlying recvfrom() call.
    long resultCode;

    ArrayBuffer data;

    // The address of the remote machine.
    DOMString address;

    long port;
  };

  dictionary SocketInfo {
    // The type of the passed socket. This will be <code>tcp</code> or
    // <code>udp</code>.
    SocketType socketType;

    // Whether or not the underlying socket is connected.
    //
    // For <code>tcp</code> sockets, this will remain true even if the remote
    // peer has disconnected. Reading or writing to the socket may then result
    // in an error, hinting that this socket should be disconnected via
    // <code>disconnect()</code>.
    //
    // For <code>udp</code> sockets, this just represents whether a default
    // remote address has been specified for reading and writing packets.
    boolean connected;

    // If the underlying socket is connected, contains the IPv4/6 address of
    // the peer.
    DOMString? peerAddress;

    // If the underlying socket is connected, contains the port of the
    // connected peer.
    long? peerPort;

    // If the underlying socket is bound or connected, contains its local
    // IPv4/6 address.
    DOMString? localAddress;

    // If the underlying socket is bound or connected, contains its local port.
    long? localPort;
  };

  dictionary NetworkInterface {
    // The underlying name of the adapter. On *nix, this will typically be
    // "eth0", "lo", etc.
    DOMString name;

    // The available IPv4/6 address.
    DOMString address;
  };

  callback RecvFromCallback = void (RecvFromInfo recvFromInfo);

  callback SendToCallback = void (WriteInfo writeInfo);

  callback SetKeepAliveCallback = void (boolean result);

  callback SetNoDelayCallback = void (boolean result);

  callback GetInfoCallback = void (SocketInfo result);

  callback GetNetworkCallback = void (NetworkInterface[] result);

  callback JoinGroupCallback = void (long result);

  callback LeaveGroupCallback = void (long result);

  callback SetMulticastTimeToLiveCallback = void (long result);

  callback SetMulticastLoopbackModeCallback = void (long result);

  callback GetJoinedGroupsCallback = void (DOMString[] groups);

  interface Functions {
    // Creates a socket of the specified type that will connect to the specified
    // remote machine.
    // |type| : The type of socket to create. Must be <code>tcp</code> or
    // <code>udp</code>.
    // |options| : The socket options.
    // |callback| : Called when the socket has been created.
    static void create(SocketType type,
                       optional CreateOptions options,
                       CreateCallback callback);

    // Destroys the socket. Each socket created should be destroyed after use.
    // |socketId| : The socketId.
    static void destroy(long socketId);

    // Connects the socket to the remote machine (for a <code>tcp</code>
    // socket). For a <code>udp</code> socket, this sets the default address
    // which packets are sent to and read from for <code>read()</code>
    // and <code>write()</code> calls.
    // |socketId| : The socketId.
    // |hostname| : The hostname or IP address of the remote machine.
    // |port| : The port of the remote machine.
    // |callback| : Called when the connection attempt is complete.
    static void connect(long socketId,
                        DOMString hostname,
                        long port,
                        ConnectCallback callback);

    // Binds the local address for socket. Currently, it does not support
    // TCP socket.
    // |socketId| : The socketId.
    // |address| : The address of the local machine.
    // |port| : The port of the local machine.
    // |callback| : Called when the bind attempt is complete.
    static void bind(long socketId,
                     DOMString address,
                     long port,
                     BindCallback callback);

    // Disconnects the socket. For UDP sockets, <code>disconnect</code> is a
    // non-operation but is safe to call.
    // |socketId| : The socketId.
    static void disconnect(long socketId);

    // Reads data from the given connected socket.
    // |socketId| : The socketId.
    // |bufferSize| : The read buffer size.
    // |callback| : Delivers data that was available to be read without
    // blocking.
    static void read(long socketId,
                     optional long bufferSize,
                     ReadCallback callback);

    // Writes data on the given connected socket.
    // |socketId| : The socketId.
    // |data| : The data to write.
    // |callback| : Called when the write operation completes without blocking
    // or an error occurs.
    static void write(long socketId,
                      ArrayBuffer data,
                      WriteCallback callback);

    // Receives data from the given UDP socket.
    // |socketId| : The socketId.
    // |bufferSize| : The receive buffer size.
    // |callback| : Returns result of the recvFrom operation.
    static void recvFrom(long socketId,
                         optional long bufferSize,
                         RecvFromCallback callback);

    // Sends data on the given UDP socket to the given address and port.
    // |socketId| : The socketId.
    // |data| : The data to write.
    // |address| : The address of the remote machine.
    // |port| : The port of the remote machine.
    // |callback| : Called when the send operation completes without blocking
    // or an error occurs.
    static void sendTo(long socketId,
                       ArrayBuffer data,
                       DOMString address,
                       long port,
                       SendToCallback callback);

    // This method applies to TCP sockets only.
    // Listens for connections on the specified port and address. This
    // effectively makes this a server socket, and client socket
    // functions (connect, read, write) can no longer be used on this socket.
    // |socketId| : The socketId.
    // |address| : The address of the local machine.
    // |port| : The port of the local machine.
    // |backlog| : Length of the socket's listen queue.
    // |callback| : Called when listen operation completes.
    static void listen(long socketId,
                       DOMString address,
                       long port,
                       optional long backlog,
                       ListenCallback callback);

    // This method applies to TCP sockets only.
    // Registers a callback function to be called when a connection is
    // accepted on this listening server socket. Listen must be called first.
    // If there is already an active accept callback, this callback will be
    // invoked immediately with an error as the resultCode.
    // |socketId| : The socketId.
    // |callback| : The callback is invoked when a new socket is accepted.
    static void accept(long socketId,
                       AcceptCallback callback);

    // Enables or disables the keep-alive functionality for a TCP connection.
    // |socketId| : The socketId.
    // |enable| : If true, enable keep-alive functionality.
    // |delay| : Set the delay seconds between the last data packet received
    // and the first keepalive probe. Default is 0.
    // |callback| : Called when the setKeepAlive attempt is complete.
    static void setKeepAlive(long socketId,
                             boolean enable,
                             optional long delay,
                             SetKeepAliveCallback callback);

    // Sets or clears <code>TCP_NODELAY</code> for a TCP connection. Nagle's
    // algorithm will be disabled when <code>TCP_NODELAY</code> is set.
    // |socketId| : The socketId.
    // |noDelay| : If true, disables Nagle's algorithm.
    // |callback| : Called when the setNoDelay attempt is complete.
    static void setNoDelay(long socketId,
                           boolean noDelay,
                           SetNoDelayCallback callback);

    // Retrieves the state of the given socket.
    // |socketId| : The socketId.
    // |callback| : Called when the state is available.
    static void getInfo(long socketId,
                        GetInfoCallback callback);

    // Retrieves information about local adapters on this system.
    // |callback| : Called when local adapter information is available.
    static void getNetworkList(GetNetworkCallback callback);

    // Join the multicast group and start to receive packets from that group.
    // The socket must be of UDP type and must be bound to a local port
    // before calling this method.
    // |socketId| : The socketId.
    // |address| : The group address to join. Domain names are not supported.
    // |callback| : Called when the join group operation is done with an
    // integer parameter indicating the platform-independent error code.
    static void joinGroup(long socketId,
                          DOMString address,
                          JoinGroupCallback callback);

    // Leave the multicast group previously joined using <code>joinGroup</code>.
    // It's not necessary to leave the multicast group before destroying the
    // socket or exiting. This is automatically called by the OS.
    //
    // Leaving the group will prevent the router from sending multicast
    // datagrams to the local host, presuming no other process on the host is
    // still joined to the group.
    //
    // |socketId| : The socketId.
    // |address| : The group address to leave. Domain names are not supported.
    // |callback| : Called when the leave group operation is done with an
    // integer parameter indicating the platform-independent error code.
    static void leaveGroup(long socketId, DOMString address,
                           LeaveGroupCallback callback);

    // Set the time-to-live of multicast packets sent to the multicast group.
    //
    // Calling this method does not require multicast permissions.
    //
    // |socketId| : The socketId.
    // |ttl| : The time-to-live value.
    // |callback| : Called when the configuration operation is done.
    static void setMulticastTimeToLive(
        long socketId,
        long ttl,
        SetMulticastTimeToLiveCallback callback);

    // Set whether multicast packets sent from the host to the multicast
    // group will be looped back to the host.
    //
    // Note: the behavior of <code>setMulticastLoopbackMode</code> is slightly
    // different between Windows and Unix-like systems. The inconsistency
    // happens only when there is more than one application on the same host
    // joined to the same multicast group while having different settings on
    // multicast loopback mode. On Windows, the applications with loopback off
    // will not RECEIVE the loopback packets; while on Unix-like systems, the
    // applications with loopback off will not SEND the loopback packets to
    // other applications on the same host. See MSDN: http://goo.gl/6vqbj
    //
    // Calling this method does not require multicast permissions.
    //
    // |socketId| : The socketId.
    // |enabled| : Indicate whether to enable loopback mode.
    // |callback| : Called when the configuration operation is done.
    static void setMulticastLoopbackMode(
        long socketId,
        boolean enabled,
        SetMulticastLoopbackModeCallback callback);

    // Get the multicast group addresses the socket is currently joined to.
    // |socketId| : The socketId.
    // |callback| : Called with an array of strings of the result.
    static void getJoinedGroups(long socketId,
                                GetJoinedGroupsCallback callback);
  };

};