wrote journal collector

util.go

@@ -0,0 +1,34 @@
+package prism
+
+func bufferedPipe[T any](input <-chan T, output chan<- T) {
+	var buffer []T
+
+	for {
+		var outOrNil chan<- T
+		var next T
+
+		// toggle send channel
+		if len(buffer) > 0 {
+			outOrNil = output
+			next = buffer[0]
+		} else if input == nil {
+			// input closed
+			return
+		}
+
+		select {
+		case item, ok := <-input:
+			if !ok {
+				// input is closed, set input nil
+				input = nil
+				continue
+			}
+			buffer = append(buffer, item)
+		case outOrNil <- next:
+			// discard element, set to zero to free memory
+			var zero T
+			buffer[0] = zero
+			buffer = buffer[1:]
+		}
+	}
+}