From befab460a506468778a80232eef7942944b3546a Mon Sep 17 00:00:00 2001
From: Thorsten Eckel <te@znuny.com>
Date: Fri, 24 Jul 2015 12:08:54 +0200
Subject: [PATCH] Made article customer user creation thread safe.

---
 lib/import/otrs.rb | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/lib/import/otrs.rb b/lib/import/otrs.rb
index c1960334f..bf91a64d4 100644
--- a/lib/import/otrs.rb
+++ b/lib/import/otrs.rb
@@ -1300,17 +1300,27 @@ module Import::OTRS
       display_name = Mail::Field.new( 'X-From', display_name ).to_s
 
       roles = Role.lookup( name: 'Customer' )
-      user = User.create(
-        login: email,
-        firstname: display_name,
-        lastname: '',
-        email: email,
-        password: '',
-        active: true,
-        role_ids: [roles.id],
-        updated_by_id: 1,
-        created_by_id: 1,
-      )
+      begin
+        user = User.create(
+          login: email,
+          firstname: display_name,
+          lastname: '',
+          email: email,
+          password: '',
+          active: true,
+          role_ids: [roles.id],
+          updated_by_id: 1,
+          created_by_id: 1,
+        )
+      rescue ActiveRecord::RecordNotUnique
+        log "User #{email} was handled by another thread, taking this."
+        user = User.find_by( login: email )
+        if !user
+          log "User #{email} wasn't created sleep and retry."
+          sleep rand 3
+          retry
+        end
+      end
     end
     article['created_by_id'] = user.id