Add Elixir support to ejabberd

11 files changed, 203 insertions, 56 deletions

diff --git a/.gitignore b/.gitignore
index d5b7862f1..c72fcdc36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,6 @@
 /src/ejabberd.app.src
 /src/eldap_filter_yecc.erl
 /vars.config
+/dialyzer/
+/test/*.beam
+/logs/
diff --git a/Makefile.in b/Makefile.in
index 575b0bdc7..a9a16f04e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -11,6 +11,9 @@ DESTDIR =
 # /etc/ejabberd/
 ETCDIR = $(DESTDIR)@sysconfdir@/ejabberd
 
+# /bin/
+BINDIR = $(DESTDIR)@bindir@
+
 # /sbin/
 SBINDIR = $(DESTDIR)@sbindir@
 
@@ -118,6 +121,7 @@ install: all
 		|| $(INSTALL) -b -m 640 $(G_USER) ejabberd.yml.example $(ETCDIR)/ejabberd.yml
 	$(SED) -e "s*{{rootdir}}*@prefix@*" \
 		-e "s*{{installuser}}*@INSTALLUSER@*" \
+		-e "s*{{bindir}}*@bindir@*" \
 		-e "s*{{libdir}}*@libdir@*" \
 		-e "s*{{sysconfdir}}*@sysconfdir@*" \
 		-e "s*{{localstatedir}}*@localstatedir@*" \
@@ -132,6 +136,11 @@ install: all
 	# Administration script
 	[ -d $(SBINDIR) ] || $(INSTALL) -d -m 755 $(SBINDIR)
 	$(INSTALL) -m 550 $(G_USER) ejabberdctl.example $(SBINDIR)/ejabberdctl
+	# Elixir binaries
+	[ -d $(BINDIR) ] || $(INSTALL) -d -m 755 $(BINDIR)
+	[ -f deps/elixir/bin/iex ] && $(INSTALL) -m 550 $(G_USER) deps/elixir/bin/iex $(BINDIR)/iex
+	[ -f deps/elixir/bin/elixir ] && $(INSTALL) -m 550 $(G_USER) deps/elixir/bin/elixir $(BINDIR)/elixir
+	[ -f deps/elixir/bin/mix ] && $(INSTALL) -m 550 $(G_USER) deps/elixir/bin/mix $(BINDIR)/mix
 	#
 	# Init script
 	$(SED) -e "s*@ctlscriptpath@*$(SBINDIR)*" \
@@ -145,6 +154,9 @@ install: all
 	$(INSTALL) -m 644 ebin/*.beam $(BEAMDIR)
 	$(INSTALL) -m 644 deps/*/ebin/*.app $(BEAMDIR)
 	$(INSTALL) -m 644 deps/*/ebin/*.beam $(BEAMDIR)
+	# Install Elixir and Elixir dependancies
+	-$(INSTALL) -m 644 deps/*/lib/*/ebin/*.app $(BEAMDIR)
+	-$(INSTALL) -m 644 deps/*/lib/*/ebin/*.beam $(BEAMDIR)
 	rm -f $(BEAMDIR)/configure.beam
 	#
 	# ejabberd header files
@@ -201,6 +213,9 @@ uninstall: uninstall-binary
 
 uninstall-binary:
 	rm -f  $(SBINDIR)/ejabberdctl
+	rm -f  $(BINDIR)/iex
+	rm -f  $(BINDIR)/elixir
+	rm -f  $(BINDIR)/mix
 	rm -fr $(DOCDIR)
 	rm -f  $(BEAMDIR)/*.beam
 	rm -f  $(BEAMDIR)/*.app
diff --git a/configure.ac b/configure.ac
index ddbc48b88..8715c86ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -106,10 +106,10 @@ AC_ARG_ENABLE(mssql,
 esac],[db_type=generic])
 
 AC_ARG_ENABLE(all,
-[AC_HELP_STRING([--enable-all], [same as --enable-nif --enable-odbc --enable-mysql --enable-pgsql --enable-pam --enable-zlib --enable-riak --enable-json --enable-iconv --enable-debug --enable-lager --enable-tools (useful for Dialyzer checks, default: no)])],
+[AC_HELP_STRING([--enable-all], [same as --enable-nif --enable-odbc --enable-mysql --enable-pgsql --enable-pam --enable-zlib --enable-riak --enable-json --enable-elixir --enable-iconv --enable-debug --enable-lager --enable-tools (useful for Dialyzer checks, default: no)])],
 [case "${enableval}" in
-  yes) nif=true odbc=true mysql=true pgsql=true pam=true zlib=true riak=true json=true iconv=true debug=true lager=true tools=true ;;
-  no) nif=false odbc=false mysql=false pgsql=false pam=false zlib=false riak=false json=false iconv=false debug=false lager=false tools=false ;;
+  yes) nif=true odbc=true mysql=true pgsql=true pam=true zlib=true riak=true json=true elixir=true iconv=true debug=true lager=true tools=true ;;
+  no) nif=false odbc=false mysql=false pgsql=false pam=false zlib=false riak=false json=false elixir=false iconv=false debug=false lager=false tools=false ;;
   *) AC_MSG_ERROR(bad value ${enableval} for --enable-all) ;;
 esac],[])
 
@@ -185,6 +185,14 @@ AC_ARG_ENABLE(json,
   *) AC_MSG_ERROR(bad value ${enableval} for --enable-json) ;;
 esac],[if test "x$json" = "x"; then json=false; fi])
 
+AC_ARG_ENABLE(elixir,
+[AC_HELP_STRING([--enable-elixir], [enable Elixir support (default: no)])],
+[case "${enableval}" in
+  yes) elixir=true ;;
+  no)  elixir=false ;;
+  *) AC_MSG_ERROR(bad value ${enableval} for --enable-elixir) ;;
+esac],[if test "x$elixir" = "x"; then elixir=false; fi])
+
 AC_ARG_ENABLE(iconv,
 [AC_HELP_STRING([--enable-iconv], [enable iconv support (default: yes)])],
 [case "${enableval}" in
@@ -240,6 +248,7 @@ AC_SUBST(pam)
 AC_SUBST(zlib)
 AC_SUBST(riak)
 AC_SUBST(json)
+AC_SUBST(elixir)
 AC_SUBST(iconv)
 AC_SUBST(debug)
 AC_SUBST(lager)
diff --git a/ejabberdctl.template b/ejabberdctl.template
index 4e8234c99..2025fd22d 100755
--- a/ejabberdctl.template
+++ b/ejabberdctl.template
@@ -12,6 +12,7 @@ ERLANG_NODE=ejabberd@localhost
 # define default environment variables
 SCRIPT_DIR=`cd ${0%/*} && pwd`
 ERL={{erl}}
+IEX={{bindir}}/iex
 INSTALLUSER={{installuser}}
 
 # Compatibility in ZSH
@@ -128,6 +129,7 @@ if [ "$ERLANG_NODE" = "${ERLANG_NODE%.*}" ] ; then
 else
     NAME="-name"
 fi
+IEXNAME="-$NAME"
 
 # define ejabberd environment parameters
 if [ "$EJABBERD_CONFIG_PATH" != "${EJABBERD_CONFIG_PATH%.yml}" ] ; then
@@ -183,6 +185,67 @@ start()
 # attach to server
 debug()
 {
+    debugwarning
+    TTY=`tty | sed -e  's/.*\///g'`
+    $EXEC_CMD "$ERL \
+      $NAME debug-${TTY}-${ERLANG_NODE} \
+      -remsh $ERLANG_NODE \
+      -hidden \
+      $KERNEL_OPTS \
+      $ERLANG_OPTS $ARGS \"$@\""
+}
+
+# attach to server using Elixir
+iexdebug()
+{
+    debugwarning
+    TTY=`tty | sed -e  's/.*\///g'`
+    # Elixir shell is hidden as default
+    $EXEC_CMD "$IEX \
+      $IEXNAME debug-${TTY}-${ERLANG_NODE} \
+      --remsh $ERLANG_NODE \
+      --erl \"$KERNEL_OPTS\" \
+      --erl \"$ERLANG_OPTS\" --erl \"$ARGS\" --erl \"$@\""
+}
+
+# start interactive server
+live()
+{
+    livewarning
+    $EXEC_CMD "$ERL \
+      $NAME $ERLANG_NODE \
+      -pa $EJABBERD_EBIN_PATH \
+      -mnesia dir \"\\\"$SPOOL_DIR\\\"\" \
+      $KERNEL_OPTS \
+      $EJABBERD_OPTS \
+      -s ejabberd \
+      $ERLANG_OPTS $ARGS \"$@\""
+}
+
+# start interactive server with Elixir
+iexlive()
+{
+    livewarning
+    $EXEC_CMD "$IEX \
+      $IEXNAME $ERLANG_NODE \
+      -pa $EJABBERD_EBIN_PATH \
+      --erl \"-mnesia dir \\\"$SPOOL_DIR\\\"\" \
+      --erl \"$KERNEL_OPTS\" \
+      --erl \"$EJABBERD_OPTS\" \
+      --app ejabberd \
+      --erl \"$ERLANG_OPTS\" --erl $ARGS --erl \"$@\""
+}
+
+etop()
+{
+    $EXEC_CMD "$ERL \
+      $NAME debug-${TTY}-${ERLANG_NODE} \
+      -hidden -s etop -s erlang halt -output text -node $ERLANG_NODE"
+}
+
+# TODO: refactor debug warning and livewarning
+debugwarning()
+{
     if [ "$EJABBERD_BYPASS_WARNINGS" != "true" ] ; then
         echo "--------------------------------------------------------------------"
         echo ""
@@ -199,21 +262,13 @@ debug()
         echo "--------------------------------------------------------------------"
         echo "To bypass permanently this warning, add to ejabberdctl.cfg the line:"
         echo "  EJABBERD_BYPASS_WARNINGS=true"
-        echo "Press any key to continue"
+        echo "Press return to continue"
         read foo
         echo ""
-    fi
-    TTY=`tty | sed -e  's/.*\///g'`
-    $EXEC_CMD "$ERL \
-      $NAME debug-${TTY}-${ERLANG_NODE} \
-      -remsh $ERLANG_NODE \
-      -hidden \
-      $KERNEL_OPTS \
-      $ERLANG_OPTS $ARGS \"$@\""
+    fi    
 }
 
-# start interactive server
-live()
+livewarning()
 {
     check_start
     if [ "$EJABBERD_BYPASS_WARNINGS" != "true" ] ; then
@@ -231,34 +286,22 @@ live()
         echo "--------------------------------------------------------------------"
         echo "To bypass permanently this warning, add to ejabberdctl.cfg the line:"
         echo "  EJABBERD_BYPASS_WARNINGS=true"
-        echo "Press any key to continue"
+        echo "Press return to continue"
         read foo
         echo ""
     fi
-    $EXEC_CMD "$ERL \
-      $NAME $ERLANG_NODE \
-      -pa $EJABBERD_EBIN_PATH \
-      -mnesia dir \"\\\"$SPOOL_DIR\\\"\" \
-      $KERNEL_OPTS \
-      $EJABBERD_OPTS \
-      -s ejabberd \
-      $ERLANG_OPTS $ARGS \"$@\""
-}
-
-etop()
-{
-    $EXEC_CMD "$ERL \
-      $NAME debug-${TTY}-${ERLANG_NODE} \
-      -hidden -s etop -s erlang halt -output text -node $ERLANG_NODE"
 }
 
+# TODO: Make iex command display only if ejabberd Elixir support has been enabled
 help()
 {
     echo ""
     echo "Commands to start an ejabberd node:"
-    echo "  start  Start an ejabberd node in server mode"
-    echo "  debug  Attach an interactive Erlang shell to a running ejabberd node"
-    echo "  live   Start an ejabberd node in live (interactive) mode"
+    echo "  start    Start an ejabberd node in server mode"
+    echo "  debug    Attach an interactive Erlang shell to a running ejabberd node"
+    echo "  iexdebug Attach an interactive Elixir shell to a running ejabberd node"
+    echo "  live     Start an ejabberd node in live (interactive) mode"
+    echo "  iexlive  Start an ejabberd node in live (interactive) mode, within an Elixir shell"
     echo ""
     echo "Optional parameters when starting an ejabberd node:"
     echo "  --config-dir dir   Config ejabberd:    $ETC_DIR"
@@ -409,7 +452,9 @@ wait_for_status()
 case $ARGS in
     ' start') start;;
     ' debug') debug;;
+    ' iexdebug') iexdebug;;
     ' live') live;;
+    ' iexlive') iexlive;;
     ' etop') etop;;
     ' started') wait_for_status 0 30 2;; # wait 30x2s before timeout
     ' stopped') wait_for_status 3 15 2 && stop_epmd;; # wait 15x2s before timeout
diff --git a/lib/Ejabberd/hooks.ex b/lib/Ejabberd/hooks.ex
new file mode 100644
index 000000000..a9e0dfef7
--- /dev/null
+++ b/lib/Ejabberd/hooks.ex
@@ -0,0 +1,13 @@
+defmodule Ejabberd.Hooks do
+
+  # Generic hook setting features
+  def add(hook_name, host, module, function, priority) do
+    :ejabberd_hooks.add(hook_name, host, module, function, priority)
+  end
+
+  # Should be named 'removed'
+  def delete(hook_name, host, module, function, priority) do
+    :ejabberd_hooks.delete(hook_name, host, module, function, priority)
+  end
+
+end
diff --git a/lib/Ejabberd/logger.ex b/lib/Ejabberd/logger.ex
new file mode 100644
index 000000000..bef1cb3aa
--- /dev/null
+++ b/lib/Ejabberd/logger.ex
@@ -0,0 +1,9 @@
+defmodule Ejabberd.Logger do
+
+  def critical(message, args \\ []), do: :lager.log(:critical, [], message, args)
+  def error(message, args \\ []),    do: :lager.log(:error, [], message, args)
+  def warning(message, args \\ []),  do: :lager.log(:warning, [], message, args)
+  def info(message, args \\ []),     do: :lager.log(:info, [], message, args)
+  def debug(message, args \\ []),    do: :lager.log(:debug, [], message, args)
+
+end
diff --git a/lib/ejabber.ex b/lib/ejabber.ex
new file mode 100644
index 000000000..a843abc97
--- /dev/null
+++ b/lib/ejabber.ex
@@ -0,0 +1,2 @@
+defmodule Ejabberd do
+end
diff --git a/lib/mod_presence_demo.ex b/lib/mod_presence_demo.ex
new file mode 100644
index 000000000..89fc60d87
--- /dev/null
+++ b/lib/mod_presence_demo.ex
@@ -0,0 +1,21 @@
+defmodule ModPresenceDemo do
+  import Ejabberd.Logger # this allow using info, error, etc for logging
+  @behaviour :gen_mod
+
+  def start(host, _opts) do
+    info('Starting ejabberd module Presence Demo')
+    Ejabberd.Hooks.add(:set_presence_hook, host, __ENV__.module, :on_presence, 50)
+    :ok
+  end
+  
+  def stop(host) do
+    info('Stopping ejabberd module Presence Demo')
+    Ejabberd.Hooks.delete(:set_presence_hook, host, __ENV__.module, :on_presence, 50)
+    :ok
+  end
+  
+  def on_presence(user, _server, _resource, _packet) do
+    info('Receive presence for #{user}')
+    :none
+  end 
+end
diff --git a/rebar.config.script b/rebar.config.script
index 30d479eab..64398f33e 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -95,6 +95,9 @@ CfgDeps = lists:flatmap(
 		       {tag, "1.4.2"}}}];
                ({json, true}) ->
                     [{jiffy, ".*", {git, "git://github.com/davisp/jiffy"}}];
+               ({elixir, true}) ->
+                    [{rebar_elixir_plugin, ".*", {git, "git://github.com/yrashk/rebar_elixir_plugin"}},
+                     {elixir, "1.1.*", {git, "git://github.com/elixir-lang/elixir"}}];
                ({iconv, true}) ->
                     [{p1_iconv, ".*", {git, "git://github.com/processone/eiconv"}}];
                ({lager, true}) ->
@@ -142,6 +145,13 @@ CfgXrefs = lists:flatmap(
 		     []
             end, Cfg),
 
+ElixirConfig = case lists:keysearch(elixir, 1, Cfg) of
+                   {value, {elixir, true}} ->
+                       [{plugins, [rebar_elixir_compiler, rebar_exunit] },
+                        {lib_dirs, ["deps/elixir/lib"]}];
+                   _ ->
+                       []
+               end,
 
 {ok, Cwd} = file:get_cwd(),
 
@@ -157,7 +167,7 @@ Config = [{erl_opts, Macros ++ HiPE ++ DebugInfo ++
 	   [{"(XC - UC) || (XU - X - B - "
 	     ++ string:join(CfgXrefs, " - ") ++ ")", []}]},
           {post_hooks, PostHooks ++ CfgPostHooks},
-          {deps, Deps ++ CfgDeps}],
+          {deps, Deps ++ CfgDeps}] ++ ElixirConfig,
 %%io:format("ejabberd configuration:~n  ~p~n", [Config]),
 Config.
 
diff --git a/src/ejabberd_config.erl b/src/ejabberd_config.erl
index cacec8bf1..54a635905 100644
--- a/src/ejabberd_config.erl
+++ b/src/ejabberd_config.erl
@@ -707,26 +707,40 @@ replace_module(mod_roster_odbc) -> {mod_roster, odbc};
 replace_module(mod_shared_roster_odbc) -> {mod_shared_roster, odbc};
 replace_module(mod_vcard_odbc) -> {mod_vcard, odbc};
 replace_module(mod_vcard_xupdate_odbc) -> {mod_vcard_xupdate, odbc};
-replace_module(Module) -> Module.
-
-replace_modules(Modules) ->
-    lists:map(
-      fun({Module, Opts}) ->
-              case replace_module(Module) of
-                  {NewModule, DBType} ->
-                      emit_deprecation_warning(Module, NewModule, DBType),
-                      NewOpts = [{db_type, DBType} |
-                                 lists:keydelete(db_type, 1, Opts)],
-                      {NewModule, transform_module_options(Module, NewOpts)};
-                  NewModule ->
-                      if Module /= NewModule ->
-                              emit_deprecation_warning(Module, NewModule);
-                         true ->
-                              ok
-                      end,
-                      {NewModule, transform_module_options(Module, Opts)}
-              end
-      end, Modules).
+replace_module(Module) ->
+    case is_elixir_module(Module) of
+        true  -> expand_elixir_module(Module);
+        false -> Module
+    end.
+
+replace_modules(Modules) -> lists:map( fun({Module, Opts}) -> case
+    replace_module(Module) of {NewModule, DBType} ->
+    emit_deprecation_warning(Module, NewModule, DBType), NewOpts =
+    [{db_type, DBType} | lists:keydelete(db_type, 1, Opts)],
+    {NewModule, transform_module_options(Module, NewOpts)}; NewModule
+    -> if Module /= NewModule -> emit_deprecation_warning(Module,
+    NewModule); true -> ok end, {NewModule,
+    transform_module_options(Module, Opts)} end end, Modules).
+
+%% Elixir module naming
+%% ====================
+
+%% If module name start with uppercase letter, this is an Elixir module:
+is_elixir_module(Module) ->
+    case atom_to_list(Module) of
+        [H|_] when H >= 65, H =< 90 -> true;
+        _ ->false
+    end.
+
+%% We assume we know this is an elixir module
+expand_elixir_module(Module) ->
+    case atom_to_list(Module) of
+        %% Module name already specified as an Elixir from Erlang module name
+        "Elixir." ++ _ -> Module;
+        %% if start with uppercase letter, this is an Elixir module: Append 'Elixir.' to module name.
+        ModuleString ->
+            list_to_atom("Elixir." ++ ModuleString)
+    end.
 
 strings_to_binary([]) ->
     [];
@@ -1009,5 +1023,10 @@ emit_deprecation_warning(Module, NewModule, DBType) ->
                  " instead", [Module, NewModule, DBType]).
 
 emit_deprecation_warning(Module, NewModule) ->
-    ?WARNING_MSG("Module ~s is deprecated, use ~s instead",
-                 [Module, NewModule]).
+    case is_elixir_module(NewModule) of
+        %% Do not emit deprecation warning for Elixir
+        true -> ok;
+        false ->
+            ?WARNING_MSG("Module ~s is deprecated, use ~s instead",
+                         [Module, NewModule])
+    end.
diff --git a/vars.config.in b/vars.config.in
index dce8cd204..7621d1390 100644
--- a/vars.config.in
+++ b/vars.config.in
@@ -26,6 +26,7 @@
 {zlib, @zlib@}.
 {riak, @riak@}.
 {json, @json@}.
+{elixir, @elixir@}.
 {lager, @lager@}.
 {iconv, @iconv@}.