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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // Copyright 2017 clair 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 featurefmt exposes functions to dynamically register methods for | ||
| // determining the features present in an image layer. | ||
| package featurefmt | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "path/filepath" | ||
| "runtime" | ||
| "sync" | ||
| "testing" | ||
|
|
||
| "github.com/coreos/clair/database" | ||
| "github.com/coreos/clair/pkg/tarutil" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| var ( | ||
| listersM sync.RWMutex | ||
| listers = make(map[string]Lister) | ||
| ) | ||
|
|
||
| // Lister represents an ability to list the features present in an image layer. | ||
| type Lister interface { | ||
| // ListFeatures produces a list of FeatureVersions present in an image layer. | ||
| ListFeatures(tarutil.FilesMap) ([]database.FeatureVersion, error) | ||
|
|
||
| // RequiredFilenames returns the list of files required to be in the FilesMap | ||
| // provided to the ListFeatures method. | ||
| // | ||
| // Filenames must not begin with "/". | ||
| RequiredFilenames() []string | ||
| } | ||
|
|
||
| // RegisterLister makes a Lister available by the provided name. | ||
| // | ||
| // If called twice with the same name, the name is blank, or if the provided | ||
| // Lister is nil, this function panics. | ||
| func RegisterLister(name string, l Lister) { | ||
| if name == "" { | ||
| panic("featurefmt: could not register a Lister with an empty name") | ||
| } | ||
| if l == nil { | ||
| panic("featurefmt: could not register a nil Lister") | ||
| } | ||
|
|
||
| listersM.Lock() | ||
| defer listersM.Unlock() | ||
|
|
||
| if _, dup := listers[name]; dup { | ||
| panic("featurefmt: RegisterLister called twice for " + name) | ||
| } | ||
|
|
||
| listers[name] = l | ||
| } | ||
|
|
||
| // ListFeatures produces the list of FeatureVersions in an image layer using | ||
| // every registered Lister. | ||
| func ListFeatures(files tarutil.FilesMap) ([]database.FeatureVersion, error) { | ||
| listersM.RLock() | ||
| defer listersM.RUnlock() | ||
|
|
||
| var totalFeatures []database.FeatureVersion | ||
| for _, lister := range listers { | ||
| features, err := lister.ListFeatures(files) | ||
| if err != nil { | ||
| return []database.FeatureVersion{}, err | ||
| } | ||
| totalFeatures = append(totalFeatures, features...) | ||
| } | ||
|
|
||
| return totalFeatures, nil | ||
| } | ||
|
|
||
| // RequiredFilenames returns the total list of files required for all | ||
| // registered Listers. | ||
| func RequiredFilenames() (files []string) { | ||
| listersM.RLock() | ||
| defer listersM.RUnlock() | ||
|
|
||
| for _, lister := range listers { | ||
| files = append(files, lister.RequiredFilenames()...) | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
||
| // TestData represents the data used to test an implementation of Lister. | ||
| type TestData struct { | ||
| Files tarutil.FilesMap | ||
| FeatureVersions []database.FeatureVersion | ||
| } | ||
|
|
||
| // LoadFileForTest can be used in order to obtain the []byte contents of a file | ||
| // that is meant to be used for test data. | ||
| func LoadFileForTest(name string) []byte { | ||
| _, filename, _, _ := runtime.Caller(0) | ||
| d, _ := ioutil.ReadFile(filepath.Join(filepath.Dir(filename)) + "/" + name) | ||
| return d | ||
| } | ||
|
|
||
| // TestLister runs a Lister on each provided instance of TestData and asserts | ||
| // the ouput to be equal to the expected output. | ||
| func TestLister(t *testing.T, l Lister, testData []TestData) { | ||
| for _, td := range testData { | ||
| featureVersions, err := l.ListFeatures(td.Files) | ||
| if assert.Nil(t, err) && assert.Len(t, featureVersions, len(td.FeatureVersions)) { | ||
| for _, expectedFeatureVersion := range td.FeatureVersions { | ||
| assert.Contains(t, featureVersions, expectedFeatureVersion) | ||
| } | ||
| } | ||
| } | ||
| } |
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