1 files changed, 8 insertions, 5 deletions

diff --git a/server/src/Thermoprint/Server/API.hs b/server/src/Thermoprint/Server/API.hs
index 5fbb18e..44b8402 100644
--- a/server/src/Thermoprint/Server/API.hs
+++ b/server/src/Thermoprint/Server/API.hs
@@ -46,6 +46,7 @@ import Data.Traversable (mapM)
 import Data.Bifunctor
 import Data.Monoid
 import Data.Maybe
+import Data.Function (on)
 
 import Database.Persist
 import Database.Persist.Sql
@@ -141,12 +142,14 @@ jobStatus jobId = maybe (left err404) return . lookup jobId . toList =<< listJob
 abortJob :: API.JobId -> Handler ()
 abortJob jobId = do
   printerIds <- asks (Map.keys . printers)
-  forM_ printerIds $ \pId -> do
+  found <- fmap or . forM printerIds $ \pId -> do
     (pId', p) <- lookupPrinter $ Just pId
-    found <- liftIO . atomically $ do
-      current <- readTVar $ queue p
-      modifyTVar' (queue p) $ force . (\q@(Queue pending _ _) -> q { pending = Seq.filter (/= castId jobId) pending })
-    undefined
+    liftIO . atomically $ do
+      current@(Queue pending _ _) <- readTVar $ queue p
+      let filtered = Seq.filter (/= castId jobId) pending
+      writeTVar (queue p) $ current { pending = filtered }
+      return $ ((==) `on` length) pending filtered
+  when (not found) $ left err404
 
 listDrafts :: Handler (Map API.DraftId (Maybe DraftTitle))
 listDrafts = return undefined