%%
%% %CopyrightBegin%
%%
  Copyright Ericsson AB 2005 - 2020 . All Rights Reserved .
%%
  Licensed 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
%%
%%     -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.
%%
%% %CopyrightEnd%
%%

%%

%%% Description: Example ssh client
-module(ssh_chan_behaviours_client).
-behaviour(ssh_client_channel).
-record(state, {
          parent,
          cm,
          ch,
          dbg
         }).
-export([start_link/1, start/1,
         stop/1, send_eof/1,
         init/1, handle_msg/2, handle_ssh_msg/2, terminate/2,
         code_change/3, handle_call/3, handle_cast/2
        ]).

-define(DBG(State,Fmt,Args),
        case State#state.dbg of
            true -> ct:log("~p:~p ~p C=~p Ch=~p "++Fmt,
                           [?MODULE,?LINE,self(),State#state.cm,State#state.ch|Args]);
            false -> ok
        end).


start_link(C) ->
    {ok, Ch} = ssh_connection:session_channel(C, infinity),
    ssh_client_channel:start_link(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).

start(C) ->
    {ok, Ch} = ssh_connection:session_channel(C, infinity),
    ssh_client_channel:start(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).

send_eof(ChRef) ->
    ssh_client_channel:call(ChRef, send_eof).

stop(ChRef) ->
    ssh_client_channel:call(ChRef, stop).


init([C, Ch, Parent, Dbg|_Exec]) ->
    case ssh_connection:subsystem(C, Ch, "ch1", infinity) of
        success ->
            State = #state{cm = C,
                           ch = Ch,
                           parent=Parent,
                           dbg=Dbg},
            ?DBG(State, "callback spawned, parent = ~p", [Parent]),
            {ok, State};

        Other ->
            {stop, Other}
    end.

handle_msg({ssh_channel_up, ChannelId, ConnectionManager}=M, State0) ->
    State = State0#state{cm = ConnectionManager,
                         ch = ChannelId},
    tell_parent(M, State),
    ?DBG(State, "ssh_channel_up",[]),
    {ok, State}.

handle_ssh_msg({ssh_cm, C, {data, Ch, 0, Data}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "ssh_cm data size(Data)=~p",[size(Data)]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {data, Ch, Type, Data}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "ssh_cm data Type=~p : ~p",[Type,Data]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {eof, Ch}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "eof",[]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {signal, Ch, _SigNameStr}=Sig} = M, #state{ch=Ch,cm=C} = State) ->
  Ignore signals according to RFC 4254 section 6.9 .
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {exit_signal, Ch, _, _Error, _}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {stop, Ch, State};

handle_ssh_msg({ssh_cm, C, {exit_status, Ch, _Status}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {stop, Ch, State}.


handle_call(send_eof, _From,#state{ch=Ch,cm=C} =  State) ->
    {reply, ssh_connection:send_eof(C,Ch), State};

handle_call(stop, _From, State) ->
    {stop, normal, ok, State};

handle_call(Msg, _From, State) ->
    ?DBG(State, "Unknown call ~p", [Msg]),
    {reply, {unknown_call,Msg}, State}.


terminate(Reason, State) ->
    tell_parent({terminate,Reason}, State),
    ?DBG(State, "terminate Reason = ~p",[Reason]).


handle_cast(Msg, State) -> 
    ?DBG(State, "Unknown cast ~p", [Msg]),
    {noreply, State}.

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

%%%================================================================
%%%
%%%

tell_parent(Msg, #state{parent = Parent,
                        cm = C,
                        ch = Ch}) -> Parent ! {{C,Ch}, Msg}.



 %CopyrightBegin%


 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     -2.0

 Unless required by applicable law or agreed to in writing, software
 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.

 %CopyrightEnd%


 Description: Example ssh client
================================================================


  Copyright Ericsson AB 2005 - 2020 . All Rights Reserved .
  Licensed under the Apache License , Version 2.0 ( the " License " ) ;
  distributed under the License is distributed on an " AS IS " BASIS ,


-module(ssh_chan_behaviours_client).
-behaviour(ssh_client_channel).
-record(state, {
          parent,
          cm,
          ch,
          dbg
         }).
-export([start_link/1, start/1,
         stop/1, send_eof/1,
         init/1, handle_msg/2, handle_ssh_msg/2, terminate/2,
         code_change/3, handle_call/3, handle_cast/2
        ]).

-define(DBG(State,Fmt,Args),
        case State#state.dbg of
            true -> ct:log("~p:~p ~p C=~p Ch=~p "++Fmt,
                           [?MODULE,?LINE,self(),State#state.cm,State#state.ch|Args]);
            false -> ok
        end).


start_link(C) ->
    {ok, Ch} = ssh_connection:session_channel(C, infinity),
    ssh_client_channel:start_link(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).

start(C) ->
    {ok, Ch} = ssh_connection:session_channel(C, infinity),
    ssh_client_channel:start(C, Ch, ssh_chan_behaviours_client, [C, Ch, self(), true]).

send_eof(ChRef) ->
    ssh_client_channel:call(ChRef, send_eof).

stop(ChRef) ->
    ssh_client_channel:call(ChRef, stop).


init([C, Ch, Parent, Dbg|_Exec]) ->
    case ssh_connection:subsystem(C, Ch, "ch1", infinity) of
        success ->
            State = #state{cm = C,
                           ch = Ch,
                           parent=Parent,
                           dbg=Dbg},
            ?DBG(State, "callback spawned, parent = ~p", [Parent]),
            {ok, State};

        Other ->
            {stop, Other}
    end.

handle_msg({ssh_channel_up, ChannelId, ConnectionManager}=M, State0) ->
    State = State0#state{cm = ConnectionManager,
                         ch = ChannelId},
    tell_parent(M, State),
    ?DBG(State, "ssh_channel_up",[]),
    {ok, State}.

handle_ssh_msg({ssh_cm, C, {data, Ch, 0, Data}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "ssh_cm data size(Data)=~p",[size(Data)]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {data, Ch, Type, Data}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "ssh_cm data Type=~p : ~p",[Type,Data]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {eof, Ch}}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "eof",[]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {signal, Ch, _SigNameStr}=Sig} = M, #state{ch=Ch,cm=C} = State) ->
  Ignore signals according to RFC 4254 section 6.9 .
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {ok, State};

handle_ssh_msg({ssh_cm, C, {exit_signal, Ch, _, _Error, _}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {stop, Ch, State};

handle_ssh_msg({ssh_cm, C, {exit_status, Ch, _Status}=Sig}=M, #state{ch=Ch,cm=C} = State) ->
    tell_parent(M, State),
    ?DBG(State, "~p",[Sig]),
    {stop, Ch, State}.


handle_call(send_eof, _From,#state{ch=Ch,cm=C} =  State) ->
    {reply, ssh_connection:send_eof(C,Ch), State};

handle_call(stop, _From, State) ->
    {stop, normal, ok, State};

handle_call(Msg, _From, State) ->
    ?DBG(State, "Unknown call ~p", [Msg]),
    {reply, {unknown_call,Msg}, State}.


terminate(Reason, State) ->
    tell_parent({terminate,Reason}, State),
    ?DBG(State, "terminate Reason = ~p",[Reason]).


handle_cast(Msg, State) -> 
    ?DBG(State, "Unknown cast ~p", [Msg]),
    {noreply, State}.

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


tell_parent(Msg, #state{parent = Parent,
                        cm = C,
                        ch = Ch}) -> Parent ! {{C,Ch}, Msg}.

