maildir,notmuch: avoid leaking open files

Previously, Message.NewReader returned the wrapped buffered reader
without a reference to the opened file, so the files descriptors
were left unclosed after reading.  Now, the file reader is returned
directly and closed on the call site.  Buffering is not needed here
because it is an implementation detail of go-message.

Fixes: https://todo.sr.ht/~rjarry/aerc/9

3 files changed, 4 insertions, 7 deletions

diff --git a/worker/maildir/message.go b/worker/maildir/message.go
index dbc9ade..b73e083 100644
--- a/worker/maildir/message.go
+++ b/worker/maildir/message.go
@@ -1,7 +1,6 @@
 package maildir
 
 import (
-	"bufio"
 	"fmt"
 	"io"
 
@@ -20,12 +19,8 @@ type Message struct {
 }
 
 // NewReader reads a message into memory and returns an io.Reader for it.
-func (m Message) NewReader() (io.Reader, error) {
-	f, err := m.dir.Open(m.key)
-	if err != nil {
-		return nil, err
-	}
-	return bufio.NewReader(f), nil
+func (m Message) NewReader() (io.ReadCloser, error) {
+	return m.dir.Open(m.key)
 }
 
 // Flags fetches the set of flags currently applied to the message.
diff --git a/worker/maildir/search.go b/worker/maildir/search.go
index edfb8d8..7f97fb1 100644
--- a/worker/maildir/search.go
+++ b/worker/maildir/search.go
@@ -159,6 +159,7 @@ func (w *Worker) searchKey(key uint32, criteria *searchCriteria,
 		if err != nil {
 			return false, err
 		}
+		defer reader.Close()
 		bytes, err := ioutil.ReadAll(reader)
 		if err != nil {
 			return false, err
diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index 621b19e..a671d73 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -432,6 +432,7 @@ func (w *Worker) handleFetchFullMessages(msg *types.FetchFullMessages) error {
 			w.worker.Logger.Printf("could not get message reader: %v", err)
 			return err
 		}
+		defer r.Close()
 		w.worker.PostMessage(&types.FullMessage{
 			Message: types.RespondTo(msg),
 			Content: &models.FullMessage{