From bae9f6d2fd5eb5bc80929bd393932b23f14d7c93 Mon Sep 17 00:00:00 2001
From: Jake Champlin <jake.champlin.27@gmail.com>
Date: Tue, 6 Jun 2017 12:40:07 -0400
Subject: Initial transfer of provider code

---
 .../hashicorp/terraform/helper/shadow/closer.go    | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 vendor/github.com/hashicorp/terraform/helper/shadow/closer.go

(limited to 'vendor/github.com/hashicorp/terraform/helper/shadow/closer.go')

diff --git a/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
new file mode 100644
index 0000000..7edd5e7
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
@@ -0,0 +1,80 @@
+package shadow
+
+import (
+	"fmt"
+	"io"
+	"reflect"
+
+	"github.com/hashicorp/go-multierror"
+	"github.com/mitchellh/reflectwalk"
+)
+
+// Close will close all shadow values within the given structure.
+//
+// This uses reflection to walk the structure, find all shadow elements,
+// and close them. Currently this will only find struct fields that are
+// shadow values, and not slice elements, etc.
+func Close(v interface{}) error {
+	// We require a pointer so we can address the internal fields
+	val := reflect.ValueOf(v)
+	if val.Kind() != reflect.Ptr {
+		return fmt.Errorf("value must be a pointer")
+	}
+
+	// Walk and close
+	var w closeWalker
+	if err := reflectwalk.Walk(v, &w); err != nil {
+		return err
+	}
+
+	return w.Err
+}
+
+type closeWalker struct {
+	Err error
+}
+
+func (w *closeWalker) Struct(reflect.Value) error {
+	// Do nothing. We implement this for reflectwalk.StructWalker
+	return nil
+}
+
+func (w *closeWalker) StructField(f reflect.StructField, v reflect.Value) error {
+	// Not sure why this would be but lets avoid some panics
+	if !v.IsValid() {
+		return nil
+	}
+
+	// Empty for exported, so don't check unexported fields
+	if f.PkgPath != "" {
+		return nil
+	}
+
+	// Verify the io.Closer is in this package
+	typ := v.Type()
+	if typ.PkgPath() != "github.com/hashicorp/terraform/helper/shadow" {
+		return nil
+	}
+
+	// We're looking for an io.Closer
+	raw := v.Interface()
+	if raw == nil {
+		return nil
+	}
+
+	closer, ok := raw.(io.Closer)
+	if !ok && v.CanAddr() {
+		closer, ok = v.Addr().Interface().(io.Closer)
+	}
+	if !ok {
+		return reflectwalk.SkipEntry
+	}
+
+	// Close it
+	if err := closer.Close(); err != nil {
+		w.Err = multierror.Append(w.Err, err)
+	}
+
+	// Don't go into the struct field
+	return reflectwalk.SkipEntry
+}
-- 
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