[logdog] Remove list functionality.

logdog/appengine/coordinator/hierarchy/component.go

Index: logdog/appengine/coordinator/hierarchy/component.go
diff --git a/logdog/appengine/coordinator/hierarchy/component.go b/logdog/appengine/coordinator/hierarchy/component.go
deleted file mode 100644
index ec704732ecca741a9b7f2249b0f24701f9b23a3c..0000000000000000000000000000000000000000
--- a/logdog/appengine/coordinator/hierarchy/component.go
+++ /dev/null
@@ -1,153 +0,0 @@
-// Copyright 2015 The LUCI Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package hierarchy
-
-import (
-	ds "github.com/luci/gae/service/datastore"
-	"github.com/luci/luci-go/logdog/common/types"
-
-	"golang.org/x/net/context"
-)
-
-// Component is a log stream hierarchy component.
-type Component struct {
-	// Parent is the partial stream path parent of this component.
-	Parent types.StreamPath
-	// Name is the name of this Component.
-	Name string
-	// Stream is true if this is a stream component, false if it is a path
-	// component.
-	Stream bool
-}
-
-// Components returns the set of hierarchy components for a given stream path.
-//
-// If isFullStream is false, all of the components in p will be considered
-// intermediate components. If isFullStream is true, p is regarded as a full
-// stream, and the last element will be marked as a stream component.
-func Components(p types.StreamPath, isFullStream bool) []*Component {
-	segments := p.SegmentCount()
-	if segments == 0 {
-		return nil
-	}
-
-	// Build all Component objects for our parts.
-	//
-	// The first component is the stream component.
-	components := make([]*Component, 0, segments)
-	for {
-		var last string
-		p, last = p.SplitLast()
-		components = append(components, &Component{
-			Parent: p,
-			Name:   last,
-			Stream: isFullStream && (len(components) == 0),
-		})
-
-		if p == "" {
-			break
-		}
-	}
-
-	return components
-}
-
-// String returns a string representation for this Component.
-//
-// For path components, this is the path. For stream components, this is the
-// path followed by a dollar sign. Note that the dollar sign is not a valid
-// types.StreamName character, and so this will not conflict with other valid
-// Components.
-//
-// For example, for {Parent="foo/bar", Name="baz"}, we get "foo/bar/baz".
-// If {Stream=true}, we would get "foo/bar/baz$".
-//
-// Two Components with the same String result reference the same path component.
-func (comp *Component) String() string {
-	s := string(comp.Path())
-	if comp.Stream {
-		s += "$"
-	}
-	return s
-}
-
-// Path returns the StreamPath for this Component.
-func (comp *Component) Path() types.StreamPath {
-	return comp.Parent.Append(comp.Name)
-}
-
-// Exists checks whether this Component exists in the datastore.
-func (comp *Component) Exists(c context.Context) (bool, error) {
-	er, err := ds.Exists(c, ds.KeyForObj(c, comp.entity()))
-	if err != nil {
-		return false, err
-	}
-	return er.All(), nil
-}
-
-// Put writes this Component to the datastore.
-//
-// Prior to writing, it will verify that the Component represents a valid
-// partial log stream path.
-func (comp *Component) Put(c context.Context) error {
-	path := comp.Path()
-	if err := path.ValidatePartial(); err != nil {
-		return err
-	}
-	return ds.Put(c, comp.entity())
-}
-
-// entity returns the componentEntity that this Component describes.
-func (comp *Component) entity() *componentEntity {
-	return mkComponentEntity(comp.Parent, comp.Name, comp.Stream)
-}
-
-// Missing checks the status of the supplied Components in the datastore.
-//
-// It mutates the supplied components array, shrinking it if necessary, to
-// return only the Components that were not already present.
-//
-// If Missing failed, it will return the original components array and the
-// failure error.
-func Missing(c context.Context, components []*Component) ([]*Component, error) {
-	exists := make([]*ds.Key, len(components))
-	for i, comp := range components {
-		exists[i] = ds.KeyForObj(c, comp.entity())
-	}
-	er, err := ds.Exists(c, exists)
-	if err != nil {
-		return nil, err
-	}
-
-	// Condense the components array.
-	nidx := 0
-	for i, v := range er.List(0) {
-		if !v {
-			components[nidx] = components[i]
-			nidx++
-		}
-	}
-	return components[:nidx], nil
-}
-
-// PutMulti performs a datastore PutMulti on all of the hierarchy entities for
-// components.
-func PutMulti(c context.Context, components []*Component) error {
-	ents := make([]*componentEntity, len(components))
-	for i, comp := range components {
-		ents[i] = comp.entity()
-	}
-	return ds.Put(c, ents)
-}