a33050637b
- pgsql/util/error.go contains error handling logic - pgsql/page/page.go contains the page struct - pgsql/monitoring contains the prometheus logic - pgsql/pgsession contains the pgsession struct
254 lines
6.6 KiB
Go
254 lines
6.6 KiB
Go
// 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 pgsql implements database.Datastore with PostgreSQL.
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package pgsql
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import (
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"database/sql"
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"fmt"
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"io/ioutil"
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"net/url"
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"strings"
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"gopkg.in/yaml.v2"
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"github.com/hashicorp/golang-lru"
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"github.com/remind101/migrate"
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log "github.com/sirupsen/logrus"
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"github.com/coreos/clair/database"
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"github.com/coreos/clair/database/pgsql/migrations"
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"github.com/coreos/clair/pkg/commonerr"
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"github.com/coreos/clair/pkg/pagination"
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)
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func init() {
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database.Register("pgsql", openDatabase)
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}
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type pgSQL struct {
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*sql.DB
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cache *lru.ARCCache
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config Config
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}
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// Begin initiates a transaction to database.
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//
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// The expected transaction isolation level in this implementation is "Read
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// Committed".
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func (pgSQL *pgSQL) Begin() (database.Session, error) {
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tx, err := pgSQL.DB.Begin()
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if err != nil {
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return nil, err
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}
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return &pgSession{
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Tx: tx,
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key: pagination.Must(pagination.KeyFromString(pgSQL.config.PaginationKey)),
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}, nil
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}
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// Close closes the database and destroys if ManageDatabaseLifecycle has been specified in
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// the configuration.
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func (pgSQL *pgSQL) Close() {
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if pgSQL.DB != nil {
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pgSQL.DB.Close()
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}
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if pgSQL.config.ManageDatabaseLifecycle {
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dbName, pgSourceURL, _ := parseConnectionString(pgSQL.config.Source)
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dropDatabase(pgSourceURL, dbName)
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}
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}
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// Ping verifies that the database is accessible.
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func (pgSQL *pgSQL) Ping() bool {
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return pgSQL.DB.Ping() == nil
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}
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// Config is the configuration that is used by openDatabase.
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type Config struct {
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Source string
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CacheSize int
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ManageDatabaseLifecycle bool
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FixturePath string
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PaginationKey string
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}
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// openDatabase opens a PostgresSQL-backed Datastore using the given
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// configuration.
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//
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// It immediately runs all necessary migrations. If ManageDatabaseLifecycle is
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// specified, the database will be created first. If FixturePath is specified,
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// every SQL queries that are present insides will be executed.
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func openDatabase(registrableComponentConfig database.RegistrableComponentConfig) (database.Datastore, error) {
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var pg pgSQL
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var err error
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// Parse configuration.
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pg.config = Config{
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CacheSize: 16384,
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}
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bytes, err := yaml.Marshal(registrableComponentConfig.Options)
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if err != nil {
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return nil, fmt.Errorf("pgsql: could not load configuration: %v", err)
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}
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err = yaml.Unmarshal(bytes, &pg.config)
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if err != nil {
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return nil, fmt.Errorf("pgsql: could not load configuration: %v", err)
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}
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if pg.config.PaginationKey == "" {
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panic("pagination key should be given")
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}
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dbName, pgSourceURL, err := parseConnectionString(pg.config.Source)
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if err != nil {
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return nil, err
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}
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// Create database.
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if pg.config.ManageDatabaseLifecycle {
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log.Info("pgsql: creating database")
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if err = createDatabase(pgSourceURL, dbName); err != nil {
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return nil, err
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}
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}
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// Open database.
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pg.DB, err = sql.Open("postgres", pg.config.Source)
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if err != nil {
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pg.Close()
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return nil, fmt.Errorf("pgsql: could not open database: %v", err)
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}
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// Verify database state.
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if err = pg.DB.Ping(); err != nil {
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pg.Close()
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return nil, fmt.Errorf("pgsql: could not open database: %v", err)
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}
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// Run migrations.
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if err = migrateDatabase(pg.DB); err != nil {
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pg.Close()
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return nil, err
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}
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// Load fixture data.
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if pg.config.FixturePath != "" {
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log.Info("pgsql: loading fixtures")
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d, err := ioutil.ReadFile(pg.config.FixturePath)
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if err != nil {
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pg.Close()
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return nil, fmt.Errorf("pgsql: could not open fixture file: %v", err)
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}
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_, err = pg.DB.Exec(string(d))
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if err != nil {
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pg.Close()
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return nil, fmt.Errorf("pgsql: an error occurred while importing fixtures: %v", err)
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}
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}
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// Initialize cache.
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// TODO(Quentin-M): Benchmark with a simple LRU Cache.
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if pg.config.CacheSize > 0 {
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pg.cache, _ = lru.NewARC(pg.config.CacheSize)
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}
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return &pg, nil
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}
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func parseConnectionString(source string) (dbName string, pgSourceURL string, err error) {
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if source == "" {
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return "", "", commonerr.NewBadRequestError("pgsql: no database connection string specified")
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}
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sourceURL, err := url.Parse(source)
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if err != nil {
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return "", "", commonerr.NewBadRequestError("pgsql: database connection string is not a valid URL")
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}
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dbName = strings.TrimPrefix(sourceURL.Path, "/")
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pgSource := *sourceURL
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pgSource.Path = "/postgres"
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pgSourceURL = pgSource.String()
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return
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}
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// migrate runs all available migrations on a pgSQL database.
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func migrateDatabase(db *sql.DB) error {
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log.Info("running database migrations")
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err := migrate.NewPostgresMigrator(db).Exec(migrate.Up, migrations.Migrations...)
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if err != nil {
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return fmt.Errorf("pgsql: an error occurred while running migrations: %v", err)
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}
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log.Info("database migration ran successfully")
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return nil
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}
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// createDatabase creates a new database.
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// The source parameter should not contain a dbname.
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func createDatabase(source, dbName string) error {
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log.WithFields(log.Fields{"source": source, "dbName": dbName}).Debug("creating database...")
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// Open database.
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db, err := sql.Open("postgres", source)
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if err != nil {
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return fmt.Errorf("pgsql: could not open 'postgres' database for creation: %v", err)
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}
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defer db.Close()
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// Create database.
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_, err = db.Exec("CREATE DATABASE " + dbName)
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if err != nil {
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return fmt.Errorf("pgsql: could not create database: %v", err)
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}
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return nil
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}
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// dropDatabase drops an existing database.
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// The source parameter should not contain a dbname.
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func dropDatabase(source, dbName string) error {
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// Open database.
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db, err := sql.Open("postgres", source)
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if err != nil {
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return fmt.Errorf("could not open database (DropDatabase): %v", err)
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}
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defer db.Close()
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// Kill any opened connection.
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if _, err = db.Exec(`
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SELECT pg_terminate_backend(pg_stat_activity.pid)
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FROM pg_stat_activity
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WHERE pg_stat_activity.datname = $1
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AND pid <> pg_backend_pid()`, dbName); err != nil {
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return fmt.Errorf("could not drop database: %v", err)
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}
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// Drop database.
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if _, err = db.Exec("DROP DATABASE " + dbName); err != nil {
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return fmt.Errorf("could not drop database: %v", err)
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}
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return nil
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}
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