/
metadata_fetchers.go
64 lines (51 loc) · 1.86 KB
/
metadata_fetchers.go
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// Copyright 2015 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 updater
import (
"sync"
"github.com/coreos/clair/database"
)
var metadataFetchers = make(map[string]MetadataFetcher)
type VulnerabilityWithLock struct {
*database.Vulnerability
Lock sync.Mutex
}
// MetadataFetcher
type MetadataFetcher interface {
// Load runs right before the Updater calls AddMetadata for each vulnerabilities.
Load(database.Datastore) error
// AddMetadata adds metadata to the given database.Vulnerability.
// It is expected that the fetcher uses .Lock.Lock() when manipulating the Metadata map.
AddMetadata(*VulnerabilityWithLock) error
// Unload runs right after the Updater finished calling AddMetadata for every vulnerabilities.
Unload()
// Clean deletes any allocated resources.
// It is invoked when Clair stops.
Clean()
}
// RegisterFetcher makes a Fetcher available by the provided name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func RegisterMetadataFetcher(name string, f MetadataFetcher) {
if name == "" {
panic("updater: could not register a MetadataFetcher with an empty name")
}
if f == nil {
panic("updater: could not register a nil MetadataFetcher")
}
if _, dup := fetchers[name]; dup {
panic("updater: RegisterMetadataFetcher called twice for " + name)
}
metadataFetchers[name] = f
}