From c80d15cfe8bfba969458c8cdb4ad7439d89856f7 Mon Sep 17 00:00:00 2001
From: Fabio Salvini <salvini.fabio001@gmail.com>
Date: Sat, 2 Dec 2017 15:55:16 +0100
Subject: [PATCH] Allow to delete the mail queue of a single file

---
 apps/log_monitor/src/mailer.erl | 38 ++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/apps/log_monitor/src/mailer.erl b/apps/log_monitor/src/mailer.erl
index 5db9ec8..7f64448 100644
--- a/apps/log_monitor/src/mailer.erl
+++ b/apps/log_monitor/src/mailer.erl
@@ -17,7 +17,7 @@
 
 %% API
 -export([start_link/0]).
--export([queue/0, empty_queue/0]).
+-export([queue/0, empty_queue/0, empty_file_queue/1]).
 
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
@@ -59,6 +59,16 @@ queue() ->
 empty_queue() ->
     gen_server:call(mailer, {empty_queue}).
 
+%%--------------------------------------------------------------------
+%% @doc
+%% Delete all the mails of the given file from the queue.
+%%
+%% @spec empty_file_queue(File) -> ok
+%% @end
+%%--------------------------------------------------------------------
+empty_file_queue(File) ->
+    gen_server:call(mailer, {empty_file_queue, File}).
+
 %%%===================================================================
 %%% gen_server callbacks
 %%%===================================================================
@@ -106,6 +116,9 @@ handle_call({queue_count}, _From, State) ->
 handle_call({empty_queue}, _From, State) ->
     remove_all_emails(),
     {reply, ok, State};
+handle_call({empty_file_queue, File}, _From, State) ->
+    remove_file_emails(File),
+    {reply, ok, State};
 handle_call(_Request, _From, State) ->
     Reply = ok,
     {reply, Reply, State}.
@@ -278,6 +291,29 @@ remove_email(Id) ->
       end),
     ok.
 
+%%--------------------------------------------------------------------
+%% @private
+%% @doc
+%% Remove all emails of the given file from the database.
+%%
+%% @spec remove_file_emails(File) -> void()
+%% @end
+%%--------------------------------------------------------------------
+remove_file_emails(File) ->
+    mnesia:activity(
+      transaction,
+      fun() ->
+              mnesia:foldl(
+                fun(#log_monitor_error{id = Id, file = ErrorFile, text = _Text}, _Acc) ->
+                        case ErrorFile of
+                            File -> mnesia:delete({log_monitor_error, Id});
+                            _ -> ok
+                        end
+                end, [], log_monitor_error)
+      end),
+    ok.
+
+
 %%--------------------------------------------------------------------
 %% @private
 %% @doc