forked from quay/clair
/
driver.go
90 lines (73 loc) · 2.47 KB
/
driver.go
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// 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 vulnsrc exposes functions to dynamically register vulnerability
// sources used to update a Clair database.
package vulnsrc
import (
"errors"
"sync"
"github.com/coreos/clair/database"
)
var (
// ErrFilesystem is returned when a fetcher fails to interact with the local filesystem.
ErrFilesystem = errors.New("vulnsrc: something went wrong when interacting with the fs")
// ErrGitFailure is returned when a fetcher fails to interact with git.
ErrGitFailure = errors.New("vulnsrc: something went wrong when interacting with git")
updatersM sync.RWMutex
updaters = make(map[string]Updater)
)
// UpdateResponse represents the sum of results of an update.
type UpdateResponse struct {
FlagName string
FlagValue string
Notes []string
Vulnerabilities []database.Vulnerability
}
// Updater represents anything that can fetch vulnerabilities and insert them
// into a Clair datastore.
type Updater interface {
// Update gets vulnerability updates.
Update(database.Datastore) (UpdateResponse, error)
// Clean deletes any allocated resources.
// It is invoked when Clair stops.
Clean()
}
// RegisterUpdater makes an Updater available by the provided name.
//
// If called twice with the same name, the name is blank, or if the provided
// Updater is nil, this function panics.
func RegisterUpdater(name string, u Updater) {
if name == "" {
panic("vulnsrc: could not register an Updater with an empty name")
}
if u == nil {
panic("vulnsrc: could not register a nil Updater")
}
updatersM.Lock()
defer updatersM.Unlock()
if _, dup := updaters[name]; dup {
panic("vulnsrc: RegisterUpdater called twice for " + name)
}
updaters[name] = u
}
// Updaters returns the list of the registered Updaters.
func Updaters() map[string]Updater {
updatersM.RLock()
defer updatersM.RUnlock()
ret := make(map[string]Updater)
for k, v := range updaters {
ret[k] = v
}
return ret
}