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

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

Index: common/dirwalk/tests/tools/walkdir/fileprocessor_read.go
diff --git a/common/dirwalk/tests/tools/walkdir/fileprocessor_read.go b/common/dirwalk/tests/tools/walkdir/fileprocessor_read.go
new file mode 100644
index 0000000000000000000000000000000000000000..39f24b8c51e88057ff3493dac3494289f552b806
--- /dev/null
+++ b/common/dirwalk/tests/tools/walkdir/fileprocessor_read.go
@@ -0,0 +1,32 @@
+// 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)
+}