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/
database_handler.go
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/
database_handler.go
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package database
import (
"database/sql"
"errors"
"fmt"
"code.cloudfoundry.org/silk/controller"
"github.com/jmoiron/sqlx"
migrate "github.com/rubenv/sql-migrate"
)
const postgresTimeNow = "EXTRACT(EPOCH FROM now())::numeric::integer"
const mysqlTimeNow = "UNIX_TIMESTAMP()"
const MySQL = "mysql"
const Postgres = "postgres"
var RecordNotAffectedError = errors.New("record not affected")
//go:generate counterfeiter -o fakes/db.go --fake-name Db . Db
type Db interface {
Exec(query string, args ...interface{}) (sql.Result, error)
Rebind(query string) string
Query(query string, args ...interface{}) (*sql.Rows, error)
QueryRow(query string, args ...interface{}) *sql.Row
DriverName() string
RawConnection() *sqlx.DB
}
//go:generate counterfeiter -o fakes/migrateAdapter.go --fake-name MigrateAdapter . migrateAdapter
type migrateAdapter interface {
Exec(db Db, dialect string, m migrate.MigrationSource, dir migrate.MigrationDirection) (int, error)
}
type DatabaseHandler struct {
migrator migrateAdapter
migrations *migrate.MemoryMigrationSource
db Db
}
func NewDatabaseHandler(migrator migrateAdapter, db Db) *DatabaseHandler {
return &DatabaseHandler{
migrator: migrator,
migrations: &migrate.MemoryMigrationSource{
Migrations: []*migrate.Migration{
{
Id: "1",
Up: []string{createSubnetTable(db.DriverName())},
Down: []string{"DROP TABLE subnets"},
},
},
},
db: db,
}
}
func (d *DatabaseHandler) CheckDatabase() error {
var result int
return d.db.QueryRow("SELECT 1").Scan(&result)
}
func (d *DatabaseHandler) All() ([]controller.Lease, error) {
rows, err := d.db.Query("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets")
if err != nil {
return nil, fmt.Errorf("selecting all subnets: %s", err)
}
defer rows.Close() // untested
leases, err := rowsToLeases(rows)
if err != nil {
return nil, fmt.Errorf("selecting all subnets: %s", err)
}
return leases, nil
}
func (d *DatabaseHandler) AllSingleIPSubnets() ([]controller.Lease, error) {
rows, err := d.db.Query("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets WHERE overlay_subnet LIKE '%/32'")
if err != nil {
return nil, fmt.Errorf("selecting all single ip subnets: %s", err)
}
defer rows.Close() // untested
leases, err := rowsToLeases(rows)
if err != nil {
return nil, fmt.Errorf("selecting all single ip subnets: %s", err)
}
return leases, nil
}
func (d *DatabaseHandler) AllBlockSubnets() ([]controller.Lease, error) {
rows, err := d.db.Query("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets WHERE overlay_subnet NOT LIKE '%/32'")
if err != nil {
return nil, fmt.Errorf("selecting all block subnets: %s", err)
}
defer rows.Close() // untested
leases, err := rowsToLeases(rows)
if err != nil {
return nil, fmt.Errorf("selecting all block subnets: %s", err)
}
return leases, nil
}
func (d *DatabaseHandler) AllActive(duration int) ([]controller.Lease, error) {
timestamp, err := timestampForDriver(d.db.DriverName())
if err != nil {
return nil, err
}
rows, err := d.db.Query(fmt.Sprintf("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets WHERE last_renewed_at + %d > %s", duration, timestamp))
if err != nil {
return nil, fmt.Errorf("selecting all active subnets: %s", err)
}
defer rows.Close() // untested
leases, err := rowsToLeases(rows)
if err != nil {
return nil, fmt.Errorf("selecting all active subnets: %s", err)
}
return leases, nil
}
func (d *DatabaseHandler) OldestExpiredBlockSubnet(expirationTime int) (*controller.Lease, error) {
timestamp, err := timestampForDriver(d.db.DriverName())
if err != nil {
return nil, err
}
var underlayIP, overlaySubnet, overlayHWAddr string
result := d.db.QueryRow(fmt.Sprintf("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets WHERE overlay_subnet NOT LIKE '%%/32' AND last_renewed_at + %d <= %s ORDER BY last_renewed_at ASC LIMIT 1", expirationTime, timestamp))
err = result.Scan(&underlayIP, &overlaySubnet, &overlayHWAddr)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, fmt.Errorf("scan result: %s", err)
}
return &controller.Lease{
UnderlayIP: underlayIP,
OverlaySubnet: overlaySubnet,
OverlayHardwareAddr: overlayHWAddr,
}, nil
}
func (d *DatabaseHandler) OldestExpiredSingleIP(expirationTime int) (*controller.Lease, error) {
timestamp, err := timestampForDriver(d.db.DriverName())
if err != nil {
return nil, err
}
var underlayIP, overlaySubnet, overlayHWAddr string
result := d.db.QueryRow(fmt.Sprintf("SELECT underlay_ip, overlay_subnet, overlay_hwaddr FROM subnets WHERE overlay_subnet LIKE '%%/32' AND last_renewed_at + %d <= %s ORDER BY last_renewed_at ASC LIMIT 1", expirationTime, timestamp))
err = result.Scan(&underlayIP, &overlaySubnet, &overlayHWAddr)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, fmt.Errorf("scan result: %s", err)
}
return &controller.Lease{
UnderlayIP: underlayIP,
OverlaySubnet: overlaySubnet,
OverlayHardwareAddr: overlayHWAddr,
}, nil
}
func (d *DatabaseHandler) Migrate() (int, error) {
migrations := d.migrations
numMigrations, err := d.migrator.Exec(d.db, d.db.DriverName(), *migrations, migrate.Up)
if err != nil {
return 0, fmt.Errorf("migrating: %s", err)
}
return numMigrations, nil
}
func (d *DatabaseHandler) AddEntry(lease controller.Lease) error {
timestamp, err := timestampForDriver(d.db.DriverName())
if err != nil {
return err
}
_, err = d.db.Exec(d.db.Rebind(fmt.Sprintf("INSERT INTO subnets (underlay_ip, overlay_subnet, overlay_hwaddr, last_renewed_at) VALUES (?, ?, ?, %s)", timestamp)), lease.UnderlayIP, lease.OverlaySubnet, lease.OverlayHardwareAddr)
if err != nil {
return fmt.Errorf("adding entry: %s", err)
}
return nil
}
func (d *DatabaseHandler) DeleteEntry(underlayIP string) error {
deleteRows, err := d.db.Exec(d.db.Rebind("DELETE FROM subnets WHERE underlay_ip = ?"), underlayIP)
if err != nil {
return fmt.Errorf("deleting entry: %s", err)
}
rowsAffected, err := deleteRows.RowsAffected()
if err != nil {
return fmt.Errorf("parse result: %s", err)
}
if rowsAffected == 0 {
return RecordNotAffectedError
}
return nil
}
func (d *DatabaseHandler) LeaseForUnderlayIP(underlayIP string) (*controller.Lease, error) {
var overlaySubnet, overlayHWAddr string
result := d.db.QueryRow(d.db.Rebind("SELECT overlay_subnet, overlay_hwaddr FROM subnets WHERE underlay_ip = ?"), underlayIP)
err := result.Scan(&overlaySubnet, &overlayHWAddr)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err // test me
}
return &controller.Lease{
UnderlayIP: underlayIP,
OverlaySubnet: overlaySubnet,
OverlayHardwareAddr: overlayHWAddr,
}, nil
}
func (d *DatabaseHandler) RenewLeaseForUnderlayIP(underlayIP string) error {
timestamp, err := timestampForDriver(d.db.DriverName())
if err != nil {
return err
}
_, err = d.db.Exec(d.db.Rebind(fmt.Sprintf("UPDATE subnets SET last_renewed_at = %s WHERE underlay_ip = ?", timestamp)), underlayIP)
if err != nil {
return fmt.Errorf("renewing lease: %s", err)
}
return nil
}
func (d *DatabaseHandler) LastRenewedAtForUnderlayIP(underlayIP string) (int64, error) {
var lastRenewedAt int64
result := d.db.QueryRow(d.db.Rebind("SELECT last_renewed_at FROM subnets WHERE underlay_ip = ?"), underlayIP)
err := result.Scan(&lastRenewedAt)
if err != nil {
return 0, err
}
return lastRenewedAt, nil
}
func rowsToLeases(rows *sql.Rows) ([]controller.Lease, error) {
leases := []controller.Lease{}
for rows.Next() {
var underlayIP, overlaySubnet, overlayHWAddr string
err := rows.Scan(&underlayIP, &overlaySubnet, &overlayHWAddr)
if err != nil {
return nil, fmt.Errorf("parsing result: %s", err)
}
leases = append(leases, controller.Lease{
UnderlayIP: underlayIP,
OverlaySubnet: overlaySubnet,
OverlayHardwareAddr: overlayHWAddr,
})
}
err := rows.Err()
if err != nil {
return nil, fmt.Errorf("getting next row: %s", err) // untested
}
return leases, nil
}
func createSubnetTable(dbType string) string {
baseCreateTable := "CREATE TABLE IF NOT EXISTS subnets (" +
"%s" +
", underlay_ip varchar(15) NOT NULL" +
", overlay_subnet varchar(18) NOT NULL" +
", overlay_hwaddr varchar(17) NOT NULL" +
", last_renewed_at bigint NOT NULL" +
", UNIQUE (underlay_ip)" +
", UNIQUE (overlay_subnet)" +
", UNIQUE (overlay_hwaddr)" +
");"
mysqlId := "id int NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)"
psqlId := "id SERIAL PRIMARY KEY"
switch dbType {
case Postgres:
return fmt.Sprintf(baseCreateTable, psqlId)
case MySQL:
return fmt.Sprintf(baseCreateTable, mysqlId)
}
return ""
}
func timestampForDriver(driverName string) (string, error) {
switch driverName {
case MySQL:
return mysqlTimeNow, nil
case Postgres:
return postgresTimeNow, nil
default:
return "", fmt.Errorf("database type %s is not supported", driverName)
}
}