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%% -------------------------------------------------------------------
%%
%% riak_handoff_listener: entry point for TCP-based handoff
%%
%% Copyright (c) 2007-2010 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------

%% @doc entry point for TCP-based handoff

-module(riak_core_handoff_listener).
-behavior(gen_nb_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
         terminate/2, code_change/3]).
-export([sock_opts/0, new_connection/2]).
-record(state, {
          ipaddr :: string(),
          portnum :: integer(),
          ssl_opts :: list()
         }).

start_link() ->
    PortNum = app_helper:get_env(riak_core, handoff_port),
    IpAddr = app_helper:get_env(riak_core, handoff_ip),
    SslOpts = riak_core_handoff_sender:get_handoff_ssl_options(),
    gen_nb_server:start_link(?MODULE, IpAddr, PortNum, [IpAddr, PortNum, SslOpts]).

init([IpAddr, PortNum, SslOpts]) ->
    register(?MODULE, self()),

    %% This exit() call shouldn't be necessary, AFAICT the VM's EXIT
    %% propagation via linking should do the right thing, but BZ 823
    %% suggests otherwise. However, the exit() call should fall into
    %% the "shouldn't hurt", especially since the next line will
    %% explicitly try to spawn a new proc that will try to register
    %% the riak_kv_handoff_listener name.
    catch exit(whereis(riak_kv_handoff_listener), kill),
    process_proxy:start_link(riak_kv_handoff_listener, ?MODULE),

    {ok, #state{portnum=PortNum, ipaddr=IpAddr, ssl_opts = SslOpts}}.

sock_opts() -> [binary, {packet, 4}, {reuseaddr, true}, {backlog, 64}].

handle_call(handoff_ip, _From, State=#state{ipaddr=I}) ->
    {reply, {ok, I}, State};

handle_call(handoff_port, _From, State=#state{portnum=P}) ->
    {reply, {ok, P}, State}.

handle_cast(_Msg, State) -> {noreply, State}.

handle_info(_Info, State) -> {noreply, State}.

terminate(_Reason, _State) -> ok.

code_change(_OldVsn, State, _Extra) -> {ok, State}.

new_connection(Socket, State = #state{ssl_opts = SslOpts}) ->
    case riak_core_handoff_manager:add_inbound(SslOpts) of
        {ok, Pid} ->
            gen_tcp:controlling_process(Socket, Pid),
            ok = riak_core_handoff_receiver:set_socket(Pid, Socket),
            {ok, State};
        {error, _Reason} ->
            riak_core_stat:update(rejected_handoffs),
            gen_tcp:close(Socket),
            {ok, State}
    end.

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