changed user database from dict to mnesia (modules: cldb)

3 files changed, 69 insertions, 50 deletions

diff --git a/server/cldb.erl b/server/cldb.erl
index 982aafc..0602b7d 100644
--- a/server/cldb.erl
+++ b/server/cldb.erl
@@ -1,7 +1,7 @@
 % The clientdatabase
 
 -module(cldb).
--export([init/0, ask/2, login/2, decVote/2, incVote/2, register/3, check_rights/2]).
+-export([init/0, ask/2, login/2, decVote/1, incVote/1, register/3, check_rights/1]).
 -record(user, {name, passwd, votes, rights}).
 
 init() ->
@@ -9,45 +9,53 @@ init() ->
     mnesia:start(),
     mnesia:create_table(user, [{attributes, record_info(fields, user)}]),
     io:format("Userdb up and running \n").
-    
+
 ask(User, Pwd) ->
     F = fun() ->
-                mnesia:match_object({user, User, Pwd, '_'})
+                mnesia:match_object({user, User, Pwd, '_', '_'})
         end,
     mnesia:transaction(F).
-    
-                
-    
+
 login(User, Pwd) ->
-    {_, Reason} = ask(User, Pwd),
-    Reason.
+    case ask(User, Pwd) of
+	{atomic, [UserRow|_]} -> {ok, UserRow};
+	_-> {error}
+    end.
 
 register(User, Pwd, Root) ->
-    F = fun() ->
-                mnesia:write(#user{name = User, passwd = Pwd, votes = 5, rights = Root})
-        end,
-    {_, Reason} = mnesia:transaction(F),
-    Reason.
+    case ask(User, '_') of
+	{atomic, []} ->
+	    F = fun() ->
+			mnesia:write(#user{name = User, passwd = Pwd, votes = 5, rights = Root})
+		end,
+	    case mnesia:transaction(F) of
+		{atomic, ok} ->
+		    {ok, user_created};
+		{atomic, Why} ->
+		    {error, Why}
+	    end;
+	_ ->
+	    {error, duplicated_user}
+    end.
 
-decVote(User, Pwd) ->
+decVote(User) ->
     F = fun() ->
-                [Head|_] = ask(User, Pwd),
+                [Head|_] = ask(User, '_'),
                 Votes = Head#user.votes - 1,
                 New = Head#user{votes = Votes},
                 mnesia:write(New)
         end,
     mnesia:transaction(F).
 
-incVote(User, Pwd) ->
+incVote(User) ->
     F = fun() ->
-                [Head|_] = ask(User, Pwd),
+                [Head|_] = ask(User, '_'),
                 Votes = Head#user.votes + 1,
                 New = Head#user{votes = Votes},
                 mnesia:write(New)
         end,
     mnesia:transaction(F).
 
-check_rights(User, Name) ->
-    {_, _, Rights} = ask(User, Name),
+check_rights(User) ->
+    {_, _, Rights} = ask(User, '_'),
     Rights.
-                
diff --git a/server/client.erl b/server/client.erl
index cb6504e..d12c891 100644
--- a/server/client.erl
+++ b/server/client.erl
@@ -1,11 +1,11 @@
 -module(client).
--export([start/1, loop/1, register/2, login/2]).
+-export([start/2, loop/2, register/2, login/2]).
 
-start(Node) ->
+start(Node, User) ->
     process_flag(trap_exit, true),
     Client = server:start_on_node(Node, client, undef),
     link(Client),
-    Server = spawn_link(client, loop, [Client]),
+    Server = spawn_link(client, loop, [Client, User]),
 
     case server:rpc(Client, {change_state, Server}) of
 	{ok} ->
@@ -25,9 +25,16 @@ execute(Client, F) ->
 	    Client ! {error, Why}
     end.
 
-loop(Client) ->
+loop(Client, User) ->
     %% mainloop for client modul in server
     receive
+	{register, Name, Password} ->
+	    case User of
+		{user, _, _, _, admin} ->
+		    execute(Client, fun() -> cldb:register(Name, Password, none) end);
+		_ -> Client ! {error, {no_rights}}
+	    end;
+
 	list ->
 	    execute(Client, fun() -> media:all() end);
 
@@ -43,7 +50,7 @@ loop(Client) ->
 	Cmd ->
 	    Client ! {error, {unknown_command, Cmd}}
     end,
-    loop(Client).
+    loop(Client, User).
 
 register(Client, {Name, Password}) ->
     dis ! {Client, {register, {Name, Password}}}.
diff --git a/server/dispatcher.erl b/server/dispatcher.erl
index e5e0572..3806ef7 100644
--- a/server/dispatcher.erl
+++ b/server/dispatcher.erl
@@ -1,5 +1,10 @@
 -module(dispatcher).
--export([start/0, init/0, handle/2]).
+-export([start/0, handle/2, checkUserExists/1]).
+
+checkUserExists([_|_]) ->
+    false;
+checkUserExists(_) ->
+    true.
 
 start() ->
     %% load server module from common directory,
@@ -7,6 +12,8 @@ start() ->
     code:purge(server),
     code:load_abs("../common/server"),
 
+    cldb:init(),
+
     %% spawn media backend in seperat process
     try spawn(media, init, []) of
 	_ ->
@@ -20,9 +27,10 @@ start() ->
     %% start server (registered as dis)
     %% server-module will call handle if message arrives and init to
     %% initialize the status
-    try server:start(dis, dispatcher) of
+    UserExists = checkUserExists(cldb:ask('_', '_')),
+    try server:start(dis, dispatcher, UserExists) of
 	true ->
-	    io:format("Server started!~n"),
+	    io:format("Server started: ~w!~n", [UserExists]),
 	    true
     catch
 	_ ->
@@ -30,34 +38,30 @@ start() ->
 	    exit(1)
     end.
 
-init() ->
-    dict:new().
+handle({register, {User, Password}}, true) ->
+    io:format("User created: ~s~n", [User]),
+    cldb:register(User, Password, admin),
+    {{ok, user_created}, false};
 
-handle({register, {User, Password}}, Dict) ->
-    case dict:find(User, Dict) of
-	{ok, _}->
-	    {{error, duplicated_user}, Dict};
-	_ ->
-	    io:format("User created: ~s~n", [User]),
-	    {{ok, user_created}, dict:store(User, Password, Dict)}
-    end;
+handle({register, _}, false) ->
+    {{error, no_rights}, false};
 
-handle({login, {Node, User, Password}}, Dict) ->
-    case dict:find(User, Dict) of
-	{ok, Password} ->
-	    case client:start(Node) of
+handle({login, {Node, User, Password}}, State) ->
+    case cldb:login(User, Password) of
+	{ok, UserRow} ->
+	    case client:start(Node, UserRow) of
 		{ok, Pid} ->
-		    {{ok, {logged_in, Pid}}, Dict};
+		    {{ok, {logged_in, Pid}}, State};
 		Why ->
-		    {{error, {unable_to_login, Why}}, Dict}
+		    {{error, {unable_to_login, Why}}, State}
 	    end;
-	_ ->
-	    {{error, user_or_password_invalid}, Dict}
+	Why ->
+	    {{error, {user_or_password_invalid, Why}}, State}
     end;
 
-handle({'EXIT', _, _}, Dict) ->
-    Dict;
+handle({'EXIT', _, _}, State) ->
+    State;
 
-handle(Cmd, Dict) ->
+handle(Cmd, State) ->
     %% standard command, to find transmission errors
-    {{error, {unknown_command, Cmd}}, Dict}.
+    {{error, {unknown_command, Cmd}}, State}.