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  • lib_chan库学习

    -module(lib_chan_cs).
    %% 实现服务器端结构和机制的模块
    
    -export([start_raw_server/4, start_raw_client/3]).
    -export([stop/1]).
    -export([children/1]).
    
    %% 客户端调用,用来连接服务器
    start_raw_client(Host, Port, PacketLength) ->
        gen_tcp:connect(Host, Port,
                [binary, {active, true}, {packet, PacketLength}]).
    
    %%启动服务器
    %%以给定端口创建名字,如果该端口已经注册则服务器已经启动
    %%如果端口未注册,则新建进程启动服务器,如果成功启动,则注册端口为新建进程号
    %%调用cold_start新建进程来启动服务器,需要传入当前进程以便能获取新建进程的消息
    %%新建进程传回进程id以确保接收到的信息是由新建进程传回的。
    start_raw_server(Port, Fun, Max, PacketLength) ->
        Name = port_name(Port),
        case whereis(Name) of
        undefined ->
            Self = self(),
            Pid = spawn_link(fun() ->
                     cold_start(Self,Port,Fun,Max,PacketLength)
                     end),
            receive
            {Pid, ok} ->
                register(Name, Pid),
                {ok, self()};
            {Pid, Error} ->
                Error
            end;
        _Pid ->
            {error, already_started}
        end.
    
    stop(Port) when integer(Port) ->
        Name = port_name(Port),
        case whereis(Name) of
        undefined ->
            not_started;
        Pid ->
            exit(Pid, kill),
            (catch unregister(Name)),
            stopped
        end.
    
    
    %%获取连接到某端口的socket
    children(Port) when integer(Port) ->
        port_name(Port) ! {children, self()},
        receive
        {session_server, Reply} -> Reply
        end.
    
    
    port_name(Port) when integer(Port) ->
        list_to_atom("portServer" ++ integer_to_list(Port)).
    
    %%监听端口
    %%开始新建进程接受客户端连接,如果接收到连接,则调用Fun(Socket)
    %%如果一个进程已经接收了一个连接,则需要再次新建进程接收客户端连接
    %%最多只能接受Max个连接,超过了后将不再新建进程接收客户端连接,直到有其他的连接结束
    cold_start(Master, Port, Fun, Max, PacketLength) ->
        process_flag(trap_exit, true),
        %% io:format("Starting a port server on ~p...~n",[Port]),
        case gen_tcp:listen(Port, [binary,
                       %% {dontroute, true},
                       {nodelay,true},
                       {packet, PacketLength},
                       {reuseaddr, true}, 
                       {active, true}]) of
        {ok, Listen} ->
            %% io:format("Listening to:~p~n",[Listen]),
            Master ! {self(), ok},
            New = start_accept(Listen, Fun),
            %% Now we're ready to run
            socket_loop(Listen, New, [], Fun, Max);
        Error ->
            Master ! {self(), Error}
        end.
    
    
    socket_loop(Listen, New, Active, Fun, Max) ->
        receive
        {istarted, New} ->
            Active1 = [New|Active],
            possibly_start_another(false,Listen,Active1,Fun,Max);
        {'EXIT', New, _Why} ->
            %% io:format("Child exit=~p~n",[Why]),
            possibly_start_another(false,Listen,Active,Fun,Max);
        {'EXIT', Pid, _Why} ->
            %% io:format("Child exit=~p~n",[Why]),
            Active1 = lists:delete(Pid, Active),
            possibly_start_another(New,Listen,Active1,Fun,Max);
        {children, From} ->
            From ! {session_server, Active},
            socket_loop(Listen,New,Active,Fun,Max);
        _Other ->
            socket_loop(Listen,New,Active,Fun,Max)
        end.
    
    
    possibly_start_another(New, Listen, Active, Fun, Max) 
      when pid(New) ->
        socket_loop(Listen, New, Active, Fun, Max);
    possibly_start_another(false, Listen, Active, Fun, Max) ->
        case length(Active) of
        N when N < Max ->
            New = start_accept(Listen, Fun),
            socket_loop(Listen, New, Active, Fun,Max);
        _ ->
            socket_loop(Listen, false, Active, Fun, Max)
        end.
    
    start_accept(Listen, Fun) ->
        S = self(),
        spawn_link(fun() -> start_child(S, Listen, Fun) end).
    
    start_child(Parent, Listen, Fun) ->
        case gen_tcp:accept(Listen) of
        {ok, Socket} ->
            Parent ! {istarted,self()},            % tell the controller
            inet:setopts(Socket, [{packet,4},
                      binary,
                      {nodelay,true},
                      {active, true}]), 
            %% before we activate socket
            %% io:format("running the child:~p Fun=~p~n", [Socket, Fun]),
            process_flag(trap_exit, true),
            case (catch Fun(Socket)) of
            {'EXIT', normal} ->
                true;
            {'EXIT', Why} ->
                io:format("Port process dies with exit:~p~n",[Why]),
                true;
            _ ->
                %% not an exit so everything's ok
                true
            end
        end.
    lib_chan_cs
    %%验证模块
    -module(lib_chan_auth).
    
    -export([make_challenge/0, make_response/2, is_response_correct/3]).
    
    make_challenge() ->
        random_string(25).
    
    make_response(Challenge, Secret) ->
        lib_md5:string(Challenge ++ Secret).
    
    is_response_correct(Challenge, Response, Secret) ->
        case lib_md5:string(Challenge ++ Secret) of
        Response -> true;
        _        -> false
        end.
    
    %% random_string(N) -> a random string with N characters.
    
    random_string(N) -> random_seed(), random_string(N, []).
    
    random_string(0, D) -> D;
    random_string(N, D) ->
        random_string(N-1, [random:uniform(26)-1+$a|D]).
    
    random_seed() ->
        {_,_,X} = erlang:now(),
        {H,M,S} = time(),
        H1 = H * X rem 32767,
        M1 = M * X rem 32767,
        S1 = S * X rem 32767,
        put(random_seed, {H1,M1,S1}).
    lib_chan_auth
    -module(lib_chan_mm).
    %% TCP中转
    %% 导入该模块的模块可以应用send发送信息,并接收{chan, self(), Term}形式的信息
    
    -export([loop/2, send/2, close/1, controller/2, set_trace/2, trace_with_tag/2]).
    
    send(Pid, Term)       -> Pid ! {send, Term}.
    close(Pid)            -> Pid ! close.
    controller(Pid, Pid1) -> Pid ! {setController, Pid1}.
    set_trace(Pid, X)     -> Pid ! {trace, X}.
        
    trace_with_tag(Pid, Tag) ->
        set_trace(Pid, {true, 
                fun(Msg) -> 
                    io:format("MM:~p ~p~n",[Tag, Msg]) 
                end}).
        
    loop(Socket, Pid) ->
        %% trace_with_tag(self(), trace),
        process_flag(trap_exit, true),
        loop1(Socket, Pid, false).
    
    %%实现对TCP发送信息,接收信息的封装
    loop1(Socket, Pid, Trace) ->
        receive
        {tcp, Socket, Bin} ->
            Term = binary_to_term(Bin),
            trace_it(Trace,{socketReceived, Term}),
            Pid ! {chan, self(), Term},
            loop1(Socket, Pid, Trace);
        {tcp_closed, Socket} ->  
            trace_it(Trace, socketClosed),
            Pid ! {chan_closed, self()};
        {'EXIT', Pid, Why} ->
            trace_it(Trace,{controllingProcessExit, Why}),
            gen_tcp:close(Socket);
        {setController, Pid1} ->
            trace_it(Trace, {changedController, Pid}),
            loop1(Socket, Pid1, Trace);
        {trace, Trace1} ->
            trace_it(Trace, {setTrace, Trace1}),
            loop1(Socket, Pid, Trace1);
        close ->
            trace_it(Trace, closedByClient),
            gen_tcp:close(Socket);
        {send, Term}  ->
            trace_it(Trace, {sendingMessage, Term}),
            gen_tcp:send(Socket, term_to_binary(Term)),
            loop1(Socket, Pid, Trace);
        UUg ->
            io:format("lib_chan_mm: protocol error:~p~n",[UUg]),
            loop1(Socket, Pid, Trace)
        end.
    trace_it(false, _)     -> void;
    trace_it({true, F}, M) -> F(M).
    lib_chan_mm
    %%主要模块
    -module(lib_chan).
    -export([cast/2, start_server/0, start_server/1,
         connect/5, disconnect/1, rpc/2]).
    -import(lists, [map/2, member/2, foreach/2]).
    -import(lib_chan_mm, [send/2, close/1]).
    
    
    start_server() ->
        case os:getenv("HOME") of
        false ->
            exit({ebadEnv, "HOME"});
        Home ->
            start_server(Home ++ "/.erlang_config/lib_chan.conf")
        end.
    
    %%根据配置文件启动服务器
    %%配置文件形如
    %%{port, 2223}.
    %%{service, chat, password,"AsDT67aQ",mfa,mod_chat_controller,start,[]}.
    %% file:consult(ConfigFile)读取config文件
    start_server(ConfigFile) ->
        io:format("lib_chan starting:~p~n",[ConfigFile]),
        case file:consult(ConfigFile) of
        {ok, ConfigData} ->
            io:format("ConfigData=~p~n",[ConfigData]),
            case check_terms(ConfigData) of
            [] ->
                start_server1(ConfigData);
            Errors ->
                exit({eDaemonConfig, Errors})
            end;
        {error, Why} ->
            exit({eDaemonConfig, Why})
        end.
    
    
    check_terms(ConfigData) ->
        L = map(fun check_term/1, ConfigData),
        [X || {error, X} <- L].
                
    check_term({port, P}) when is_integer(P)     -> ok;
    check_term({service,_,password,_,mfa,_,_,_}) -> ok;
    check_term(X) -> {error, {badTerm, X}}.
    
    %%新建服务器进程并注册为lib_chan
    start_server1(ConfigData) ->
        register(lib_chan, spawn(fun() -> start_server2(ConfigData) end)).
    
    
    start_server2(ConfigData) ->
        %%从ConfigData中提取Port
        [Port] = [ P || {port,P} <- ConfigData],
        start_port_server(Port, ConfigData).
    
    %%启动服务器,对每一个连接进入服务器的Socket调用start_port_instance(Socket,ConfigData)
    start_port_server(Port, ConfigData) ->
        lib_chan_cs:start_raw_server(Port, 
                    fun(Socket) -> 
                        start_port_instance(Socket, 
                                    ConfigData) end,
                    100,
                    4).
    
    start_port_instance(Socket, ConfigData) ->
        %% This is where the low-level connection is handled
        %% We must become a middle man
        %% But first we spawn a connection handler
        S = self(),
        Controller = spawn_link(fun() -> start_erl_port_server(S, ConfigData) end),
        lib_chan_mm:loop(Socket, Controller).
    
    start_erl_port_server(MM, ConfigData) ->
        receive
        {chan, MM, {startService, Mod, ArgC}} ->
            case get_service_definition(Mod, ConfigData) of
            {yes, Pwd, MFA} ->
                case Pwd of
                none ->
                    send(MM, ack),
                    really_start(MM, ArgC, MFA);
                _ ->
                    do_authentication(Pwd, MM, ArgC, MFA)
                end;
            no ->
                io:format("sending bad service~n"),
                send(MM, badService),
                close(MM)
            end;
        Any ->
            io:format("*** ErL port server got:~p ~p~n",[MM, Any]),
            exit({protocolViolation, Any})
        end.
    
    %%服务器用do_authentication进行验证,验证成功才对socket真正启动服务器的服务
    do_authentication(Pwd, MM, ArgC, MFA) ->
        %%生成25位随机码
        C = lib_chan_auth:make_challenge(),
        send(MM, {challenge, C}),
        receive
        {chan, MM, {response, R}} ->
            case lib_chan_auth:is_response_correct(C, R, Pwd) of
            true ->
                send(MM, ack),
                really_start(MM, ArgC, MFA);
            false ->
                send(MM, authFail),
                close(MM)
            end
        end.
    
    
    %% MM is the middle man
    %% Mod is the Module we want to execute ArgC and ArgS come from the client and
    %% server respectively
    
    really_start(MM, ArgC, {Mod, Func, ArgS}) ->
        %% authentication worked so now we're off
        case (catch apply(Mod,Func,[MM,ArgC,ArgS])) of
        {'EXIT', normal} ->
            true;
        {'EXIT', Why} ->
            io:format("server error:~p~n",[Why]);
        Why ->
            io:format("server error should die with exit(normal) was:~p~n",
                  [Why])
        end.
    
    %% get_service_definition(Name, ConfigData)
    %%获取服务的配置信息
    get_service_definition(Mod, [{service, Mod, password, Pwd, mfa, M, F, A}|_]) ->
        {yes, Pwd, {M, F, A}};
    get_service_definition(Name, [_|T]) ->
        get_service_definition(Name, T);
    get_service_definition(_, []) ->
        no.
    
    %%客户端连接服务器,先连接再进行验证
    connect(Host, Port, Service, Secret, ArgC) ->
        S = self(),
        MM = spawn(fun() -> connect(S, Host, Port) end),
        receive
        {MM, ok} ->
            case authenticate(MM, Service, Secret, ArgC) of
            ok    -> {ok, MM};
            Error -> Error
            end;
        {MM, Error} ->
            Error
        end.
    
    connect(Parent, Host, Port) ->
        case lib_chan_cs:start_raw_client(Host, Port, 4) of
        {ok, Socket} ->
            Parent ! {self(), ok},
            lib_chan_mm:loop(Socket, Parent);
        Error ->
            Parent ! {self(),  Error}
        end.
    
    authenticate(MM, Service, Secret, ArgC) ->
        send(MM, {startService, Service, ArgC}),
        %% we should get back a challenge or a ack or closed socket
        receive
        {chan, MM, ack} ->
            ok;
        {chan, MM, {challenge, C}} ->
            R = lib_chan_auth:make_response(C, Secret),
            send(MM, {response, R}),
            receive
            {chan, MM, ack} ->
                ok;
            {chan, MM, authFail} ->
                wait_close(MM),
                {error, authFail};
            Other ->
                {error, Other}
            end;
        {chan, MM, badService} ->
            wait_close(MM),
            {error, badService};
        Other ->
            {error, Other}
        end.
    
    wait_close(MM) ->
        receive
        {chan_closed, MM} ->
            true
        after 5000 ->
            io:format("**error lib_chan~n"),
            true
        end.
    
    disconnect(MM) -> close(MM).
    
    rpc(MM, Q) ->
        send(MM, Q),
        receive
        {chan, MM, Reply} ->
            Reply
        end.
    
    cast(MM, Q) ->
        send(MM, Q).
    lib_chan

    该功能的使用方法为:
    服务器端:
    -import(lib_chan_mm, [send/2, controller/2]).
    启动服务器
    lib_chan:start_server("D:\code\erlcode\socket_dist\test.conf").
    chat.conf为服务器的配置,如
    {port, 2223}.
    {service, test, password,"AsDT67aQ",mfa,mod_test_controller,start,[]}.

    新启进程来接收消息


    客户端:
    调用lib_chan:connect(Host, Port, chat, Pwd, []) 连接服务器
    将会调用配置文件中的mod_test_controller:start
    连接好后用lib_chan_mm:send(MM, Msg).来给服务器发消息

    使用方法如下例

    -module(test_server).
    -import(lib_chan_mm, [send/2, controller/2]).
    
    -compile(export_all).
    
    
    start() ->
        start_server(),
        lib_chan:start_server("D:\code\erlcode\socket_dist\test.conf").
    
    start_server() ->
        register(test_server, 
             spawn(fun() ->
                   process_flag(trap_exit, true),
                   Val= (catch server_loop([])),
                   io:format("Server terminated with:~p~n",[Val])
               end)).
    
    
    server_loop(L) ->
        receive
        {mm, Channel, Msg} ->
            io:format("test_server received Msg=~p~n",[{Channel,Msg}]);
        Msg ->
            io:format("Server received Msg=~p~n",
                  [Msg]),
            server_loop(L)
        end.
    test_server
    -module(mod_test_controller).
    -export([start/3]).
    -import(lib_chan_mm, [send/2]).
    
    start(MM, _, _) ->
        process_flag(trap_exit, true),
        io:format("mod_test_controller start...~p~n",[MM]),
        loop(MM).
    
    loop(MM) ->
         receive
         {chan, MM, Msg} ->
             test_server ! {mm, MM, Msg},
             loop(MM);
         Other ->
             io:format("mod_test_controller unexpected message =~p (MM=~p)~n",
                   [Other, MM]),
             loop(MM)
        end. 
    mod_test_controller
    -module(test_client).
    
    -export([start/0, connect/4]).
    
    
    start() -> 
        connect("localhost", 2223, "AsDT67aQ", "a test msg").
    
    connect(Host, Port, Pwd, Msg) ->
        io:format("test_client connect host:~p~n",[Msg]),
        case lib_chan:connect(Host, Port, test, Pwd, []) of
        {error, _Why} ->
            io:format("test_client can not connected:~p~n",[Msg]);
        {ok, MM} ->
              io:format("test_client connected:~p~n",[Msg]),
              lib_chan_mm:send(MM, Msg)
    end.
    test_client



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  • 原文地址:https://www.cnblogs.com/studynote/p/3345222.html
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