mox!

moxio/isclosed.go

@@ -0,0 +1,24 @@
+package moxio
+
+import (
+	"errors"
+	"net"
+	"syscall"
+)
+
+// In separate file because of import of syscall.
+
+// IsClosed returns whether i/o failed, typically because the connection is closed
+// or otherwise cannot be used for further i/o.
+//
+// Used to prevent error logging for connections that are closed.
+func IsClosed(err error) bool {
+	return errors.Is(err, net.ErrClosed) || errors.Is(err, syscall.EPIPE) || errors.Is(err, syscall.ECONNRESET) || isRemoteTLSError(err)
+}
+
+// A remote TLS client can send a message indicating failure, this makes it back to
+// us as a write error.
+func isRemoteTLSError(err error) bool {
+	var netErr *net.OpError
+	return errors.As(err, &netErr) && netErr.Op == "remote error"
+}