2017-01-15 15:52:13 +00:00
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// Copyright 2017 clair authors
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2016-01-19 20:16:45 +00:00
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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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2017-01-19 18:42:37 +00:00
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// Package database defines the Clair's models and a common interface for
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// database implementations.
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2015-11-13 19:11:28 +00:00
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package database
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2016-01-08 19:42:07 +00:00
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import (
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"errors"
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2016-05-02 22:33:03 +00:00
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"fmt"
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2016-01-08 19:42:07 +00:00
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"time"
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)
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2015-11-13 19:11:28 +00:00
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var (
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2017-07-26 23:20:19 +00:00
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// ErrBackendException is an error that occurs when the database backend
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// does not work properly (ie. unreachable).
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ErrBackendException = errors.New("database: an error occurred when querying the backend")
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2016-01-08 16:17:32 +00:00
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2015-11-13 19:11:28 +00:00
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// ErrInconsistent is an error that occurs when a database consistency check
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2017-01-15 15:52:13 +00:00
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// fails (i.e. when an entity which is supposed to be unique is detected
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// twice)
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2015-11-13 19:11:28 +00:00
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ErrInconsistent = errors.New("database: inconsistent database")
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)
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2017-01-27 01:14:44 +00:00
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// RegistrableComponentConfig is a configuration block that can be used to
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// determine which registrable component should be initialized and pass custom
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// configuration to it.
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type RegistrableComponentConfig struct {
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Type string
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Options map[string]interface{}
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}
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2016-05-02 22:33:03 +00:00
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var drivers = make(map[string]Driver)
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// Driver is a function that opens a Datastore specified by its database driver
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// type and specific configuration.
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type Driver func(RegistrableComponentConfig) (Datastore, error)
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// Register makes a Constructor available by the provided name.
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//
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// If this function is called twice with the same name or if the Constructor is
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// nil, it panics.
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func Register(name string, driver Driver) {
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if driver == nil {
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panic("database: could not register nil Driver")
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}
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if _, dup := drivers[name]; dup {
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panic("database: could not register duplicate Driver: " + name)
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}
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drivers[name] = driver
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}
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// Open opens a Datastore specified by a configuration.
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func Open(cfg RegistrableComponentConfig) (Datastore, error) {
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driver, ok := drivers[cfg.Type]
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if !ok {
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return nil, fmt.Errorf("database: unknown Driver %q (forgotten configuration or import?)", cfg.Type)
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}
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return driver(cfg)
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}
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// Session contains the required operations on a persistent data store for a
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// Clair deployment.
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//
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// Session is started by Datastore.Begin and terminated with Commit or Rollback.
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// Besides Commit and Rollback, other functions cannot be called after the
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// session is terminated.
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// Any function is not guaranteed to be called successfully if there's a session
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// failure.
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type Session interface {
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// Commit commits changes to datastore.
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//
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// Commit call after Rollback does no-op.
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Commit() error
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// Rollback drops changes to datastore.
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//
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// Rollback call after Commit does no-op.
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Rollback() error
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// UpsertAncestry inserts or replaces an ancestry and its namespaced
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// features and processors used to scan the ancestry.
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UpsertAncestry(ancestry Ancestry, features []NamespacedFeature, processedBy Processors) error
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// FindAncestry retrieves an ancestry with processors used to scan the
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// ancestry. If the ancestry is not found, return false.
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//
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// The ancestry's processors are returned to short cut processing ancestry
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// if it has been processed by all processors in the current Clair instance.
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FindAncestry(name string) (ancestry Ancestry, processedBy Processors, found bool, err error)
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// FindAncestryFeatures retrieves an ancestry with all detected namespaced
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// features. If the ancestry is not found, return false.
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FindAncestryFeatures(name string) (ancestry AncestryWithFeatures, found bool, err error)
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// PersistFeatures inserts a set of features if not in the database.
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PersistFeatures(features []Feature) error
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// PersistNamespacedFeatures inserts a set of namespaced features if not in
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// the database.
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PersistNamespacedFeatures([]NamespacedFeature) error
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// CacheAffectedNamespacedFeatures relates the namespaced features with the
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// vulnerabilities affecting these features.
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//
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// NOTE(Sida): it's not necessary for every database implementation and so
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// this function may have a better home.
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CacheAffectedNamespacedFeatures([]NamespacedFeature) error
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// FindAffectedNamespacedFeatures retrieves a set of namespaced features
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// with affecting vulnerabilities.
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FindAffectedNamespacedFeatures(features []NamespacedFeature) ([]NullableAffectedNamespacedFeature, error)
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// PersistNamespaces inserts a set of namespaces if not in the database.
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PersistNamespaces([]Namespace) error
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// PersistLayer inserts a layer if not in the datastore.
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PersistLayer(Layer) error
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// PersistLayerContent persists a layer's content in the database. The given
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// namespaces and features can be partial content of this layer.
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//
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// The layer, namespaces and features are expected to be already existing
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// in the database.
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PersistLayerContent(hash string, namespaces []Namespace, features []Feature, processedBy Processors) error
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// FindLayer retrieves a layer and the processors scanned the layer.
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FindLayer(hash string) (layer Layer, processedBy Processors, found bool, err error)
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// FindLayerWithContent returns a layer with all detected features and
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// namespaces.
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FindLayerWithContent(hash string) (layer LayerWithContent, found bool, err error)
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// InsertVulnerabilities inserts a set of UNIQUE vulnerabilities with
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// affected features into database, assuming that all vulnerabilities
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// provided are NOT in database and all vulnerabilities' namespaces are
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// already in the database.
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InsertVulnerabilities([]VulnerabilityWithAffected) error
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2017-12-07 11:45:17 +00:00
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ListVulnerabilities() ([]NullableVulnerability, error)
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// FindVulnerability retrieves a set of Vulnerabilities with affected
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// features.
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FindVulnerabilities([]VulnerabilityID) ([]NullableVulnerability, error)
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// DeleteVulnerability removes a set of Vulnerabilities assuming that the
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// requested vulnerabilities are in the database.
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DeleteVulnerabilities([]VulnerabilityID) error
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2016-02-02 18:29:59 +00:00
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// InsertVulnerabilityNotifications inserts a set of unique vulnerability
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// notifications into datastore, assuming that they are not in the database.
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InsertVulnerabilityNotifications([]VulnerabilityNotification) error
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// FindNewNotification retrieves a notification, which has never been
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// notified or notified before a certain time.
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FindNewNotification(notifiedBefore time.Time) (hook NotificationHook, found bool, err error)
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// FindVulnerabilityNotification retrieves a vulnerability notification with
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// affected ancestries affected by old or new vulnerability.
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//
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// Because the number of affected ancestries maybe large, they are paginated
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// and their pages are specified by the given encrypted PageNumbers, which,
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// if empty, are always considered first page.
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//
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// Session interface implementation should have encrypt and decrypt
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// functions for PageNumber.
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FindVulnerabilityNotification(name string, limit int,
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oldVulnerabilityPage PageNumber,
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newVulnerabilityPage PageNumber) (
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noti VulnerabilityNotificationWithVulnerable,
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found bool, err error)
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// MarkNotificationNotified marks a Notification as notified now, assuming
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// the requested notification is in the database.
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MarkNotificationNotified(name string) error
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// DeleteNotification removes a Notification in the database.
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2016-01-21 23:09:23 +00:00
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DeleteNotification(name string) error
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2015-11-16 21:22:16 +00:00
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2017-07-26 23:20:19 +00:00
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// UpdateKeyValue stores or updates a simple key/value pair.
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UpdateKeyValue(key, value string) error
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2016-02-12 21:24:37 +00:00
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// FindKeyValue retrieves a value from the given key.
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FindKeyValue(key string) (value string, found bool, err error)
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// Lock creates or renew a Lock in the database with the given name, owner
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// and duration.
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//
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// After the specified duration, the Lock expires by itself if it hasn't been
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// unlocked, and thus, let other users create a Lock with the same name.
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// However, the owner can renew its Lock by setting renew to true.
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// Lock should not block, it should instead returns whether the Lock has been
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// successfully acquired/renewed. If it's the case, the expiration time of
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// that Lock is returned as well.
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Lock(name string, owner string, duration time.Duration, renew bool) (success bool, expiration time.Time, err error)
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// Unlock releases an existing Lock.
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Unlock(name, owner string) error
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// FindLock returns the owner of a Lock specified by the name, and its
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// expiration time if it exists.
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FindLock(name string) (owner string, expiration time.Time, found bool, err error)
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}
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// Datastore represents a persistent data store
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type Datastore interface {
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// Begin starts a session to change.
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Begin() (Session, error)
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2015-11-13 19:11:28 +00:00
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2016-02-12 21:24:37 +00:00
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// Ping returns the health status of the database.
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Ping() bool
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// Close closes the database and frees any allocated resource.
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Close()
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}
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