globpath: only walk tree if ** is defined

closes #1517

CHANGELOG.md

@@ -36,6 +36,7 @@
 - [#1768](https://github.com/influxdata/telegraf/pull/1768): Speed up statsd parsing.
 - [#1751](https://github.com/influxdata/telegraf/issues/1751): Fix powerdns integer parse error handling.
 - [#1752](https://github.com/influxdata/telegraf/issues/1752): Fix varnish plugin defaults not being used.
+- [#1517](https://github.com/influxdata/telegraf/issues/1517): Fix windows glob paths.
 
 ## v1.0.1 [unreleased]
 

internal/globpath/globpath.go

@@ -14,6 +14,7 @@ var sepStr = fmt.Sprintf("%v", string(os.PathSeparator))
 type GlobPath struct {
 	path         string
 	hasMeta      bool
+	hasSuperMeta bool
 	g            glob.Glob
 	root         string
 }
@@ -21,12 +22,13 @@ type GlobPath struct {
 func Compile(path string) (*GlobPath, error) {
 	out := GlobPath{
 		hasMeta:      hasMeta(path),
+		hasSuperMeta: hasSuperMeta(path),
 		path:         path,
 	}
 
 	// if there are no glob meta characters in the path, don't bother compiling
 	// a glob object or finding the root directory. (see short-circuit in Match)
-	if !out.hasMeta {
+	if !out.hasMeta || !out.hasSuperMeta {
 		return &out, nil
 	}
 
@@ -48,6 +50,17 @@ func (g *GlobPath) Match() map[string]os.FileInfo {
 		}
 		return out
 	}
+	if !g.hasSuperMeta {
+		out := make(map[string]os.FileInfo)
+		files, _ := filepath.Glob(g.path)
+		for _, file := range files {
+			info, err := os.Stat(file)
+			if !os.IsNotExist(err) {
+				out[file] = info
+			}
+		}
+		return out
+	}
 	return walkFilePath(g.root, g.g)
 }
 
@@ -96,3 +109,8 @@ func findRootDir(path string) string {
 func hasMeta(path string) bool {
 	return strings.IndexAny(path, "*?[") >= 0
 }
+
+// hasSuperMeta reports whether path contains any super magic glob characters (**).
+func hasSuperMeta(path string) bool {
+	return strings.Index(path, "**") >= 0
+}