luci-go/common/dirwalk: Code for walking a directory tree efficiently

common/dirwalk/tests/tools/walkdir/fileprocessor_read.go

+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package main
+
+import (
+        "io"
+        "io/ioutil"
+)
+
+// ReadFileProcessor implements FileProcessor. It reads the contents of each found file.
+type ReadFileProcessor struct {
+        BaseFileProcessor
+}
+
+func (p *ReadFileProcessor) ReadFile(path string, r io.Reader) {
+        _, err := io.Copy(ioutil.Discard, r)
+        if err != nil {
+                p.Error(path, err)
+        }
+}
+
+func (p *ReadFileProcessor) SmallFile(path string, r io.ReadCloser) {
+        p.ReadFile(path, r)
+        p.BaseFileProcessor.SmallFile(path, r)
+}
+
+func (p *ReadFileProcessor) LargeFile(path string, r io.ReadCloser) {
+        p.ReadFile(path, r)
+        p.BaseFileProcessor.LargeFile(path, r)
+}