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127 lines
3.7 KiB
127 lines
3.7 KiB
// Copyright 2017 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package featurefmt exposes functions to dynamically register methods for
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// determining the features present in an image layer.
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package featurefmt
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import (
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"io/ioutil"
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"path/filepath"
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"runtime"
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"sync"
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"testing"
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"github.com/coreos/clair/database"
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"github.com/coreos/clair/pkg/tarutil"
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"github.com/stretchr/testify/assert"
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)
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var (
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listersM sync.RWMutex
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listers = make(map[string]Lister)
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)
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// Lister represents an ability to list the features present in an image layer.
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type Lister interface {
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// ListFeatures produces a list of FeatureVersions present in an image layer.
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ListFeatures(tarutil.FilesMap) ([]database.FeatureVersion, error)
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// RequiredFilenames returns the list of files required to be in the FilesMap
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// provided to the ListFeatures method.
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//
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// Filenames must not begin with "/".
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RequiredFilenames() []string
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}
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// RegisterLister makes a Lister available by the provided name.
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//
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// If called twice with the same name, the name is blank, or if the provided
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// Lister is nil, this function panics.
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func RegisterLister(name string, l Lister) {
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if name == "" {
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panic("featurefmt: could not register a Lister with an empty name")
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}
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if l == nil {
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panic("featurefmt: could not register a nil Lister")
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}
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listersM.Lock()
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defer listersM.Unlock()
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if _, dup := listers[name]; dup {
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panic("featurefmt: RegisterLister called twice for " + name)
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}
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listers[name] = l
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}
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// ListFeatures produces the list of FeatureVersions in an image layer using
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// every registered Lister.
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func ListFeatures(files tarutil.FilesMap) ([]database.FeatureVersion, error) {
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listersM.RLock()
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defer listersM.RUnlock()
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var totalFeatures []database.FeatureVersion
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for _, lister := range listers {
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features, err := lister.ListFeatures(files)
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if err != nil {
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return []database.FeatureVersion{}, err
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}
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totalFeatures = append(totalFeatures, features...)
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}
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return totalFeatures, nil
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}
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// RequiredFilenames returns the total list of files required for all
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// registered Listers.
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func RequiredFilenames() (files []string) {
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listersM.RLock()
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defer listersM.RUnlock()
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for _, lister := range listers {
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files = append(files, lister.RequiredFilenames()...)
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}
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return
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}
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// TestData represents the data used to test an implementation of Lister.
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type TestData struct {
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Files tarutil.FilesMap
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FeatureVersions []database.FeatureVersion
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}
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// LoadFileForTest can be used in order to obtain the []byte contents of a file
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// that is meant to be used for test data.
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func LoadFileForTest(name string) []byte {
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_, filename, _, _ := runtime.Caller(0)
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d, _ := ioutil.ReadFile(filepath.Join(filepath.Dir(filename)) + "/" + name)
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return d
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}
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// TestLister runs a Lister on each provided instance of TestData and asserts
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// the ouput to be equal to the expected output.
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func TestLister(t *testing.T, l Lister, testData []TestData) {
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for _, td := range testData {
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featureVersions, err := l.ListFeatures(td.Files)
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if assert.Nil(t, err) && assert.Len(t, featureVersions, len(td.FeatureVersions)) {
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for _, expectedFeatureVersion := range td.FeatureVersions {
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assert.Contains(t, featureVersions, expectedFeatureVersion)
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}
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}
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}
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}
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