Fix roster version support

src/mod_roster.erl

@@ -196,7 +196,7 @@ read_roster_version(LUser, LServer, mnesia) ->
       [#roster_version{version = V}] -> V;
       [] -> error
     end;
-read_roster_version(LServer, LUser, odbc) ->
+read_roster_version(LUser, LServer, odbc) ->
     Username = ejabberd_odbc:escape(LUser),
     case odbc_queries:get_roster_version(LServer, Username)
 	of

test/ejabberd_SUITE.erl

@@ -161,6 +161,7 @@ db_tests() ->
        presence_broadcast,
        last,
        roster_get,
+       roster_ver,
        private,
        privacy,
        blocking,
@@ -308,6 +309,29 @@ roster_get(Config) ->
         send_recv(Config, #iq{type = get, sub_els = [#roster{}]}),
     disconnect(Config).
 
+roster_ver(Config) ->
+    %% Get initial "ver"
+    #iq{type = result, sub_els = [#roster{ver = Ver1, items = []}]} =
+        send_recv(Config, #iq{type = get,
+                              sub_els = [#roster{ver = <<"">>}]}),
+    %% Should receive empty IQ-result
+    #iq{type = result, sub_els = []} =
+        send_recv(Config, #iq{type = get,
+                              sub_els = [#roster{ver = Ver1}]}),
+    %% Attempting to subscribe to server's JID
+    send(Config, #presence{type = subscribe, to = server_jid(Config)}),
+    %% Receive a single roster push with the new "ver"
+    #iq{type = set, sub_els = [#roster{ver = Ver2}]} = recv(),
+    %% Requesting roster with the previous "ver". Should receive Ver2 again
+    #iq{type = result, sub_els = [#roster{ver = Ver2}]} =
+        send_recv(Config, #iq{type = get,
+                              sub_els = [#roster{ver = Ver1}]}),
+    %% Now requesting roster with the newest "ver". Should receive empty IQ.
+    #iq{type = result, sub_els = []} =
+        send_recv(Config, #iq{type = get,
+                              sub_els = [#roster{ver = Ver2}]}),
+    disconnect(Config).
+
 presence(Config) ->
     send(Config, #presence{}),
     JID = my_jid(Config),

test/ejabberd_SUITE_data/ejabberd.yml

@@ -34,6 +34,8 @@ host_config:
           - "hometree"
           - "pep"
       mod_roster:
+        versioning: true
+        store_current_id: true
         db_type: odbc
       mod_vcard: 
         db_type: odbc
@@ -85,6 +87,8 @@ Welcome to this XMPP server."
           - "hometree"
           - "pep"
       mod_roster: 
+        versioning: true
+        store_current_id: true
         db_type: odbc
       mod_vcard: 
         db_type: odbc
@@ -129,6 +133,8 @@ Welcome to this XMPP server."
           - "hometree"
           - "pep"
       mod_roster: 
+        versioning: true
+        store_current_id: true
         db_type: internal
       mod_vcard: 
         db_type: internal