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be4f365eaf
Switch Serverless from using BoltDB to Postgres as metadata store. Previously, the controller stored all metadata to BoltDB. This implements SQLDB (currently Postgres flavored) as the backing store for metadata. This will allow us to have multiple instances of the controller running for HA, and to easily inspect and repair the contents of the metadata store. Unfortunately, it was not straightforward to keep the BoltDB implementation working alongside the SQL one, so it will be removed in a later patch. Once that's done, the SQL implementation should allow for a number of simplifications of the schemar and balancer interfaces. Database migration is built directly into the application by embedding the migration files and logic from the `soda` command line tool. When connecting to the RDBMS, the app will always attempt to create the necessary database and apply any outstanding migrations. Integration tests truncate all tables upon start, but *not* at the end, so the state of the database can be inspected after integration tests. Had to refactor some of the controller's background tasks to make sure they get properly shut down on controller exit.
118 lines
3.4 KiB
Go
118 lines
3.4 KiB
Go
package service
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import (
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"net/http"
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"os"
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"github.com/featurebasedb/featurebase/v3/dax"
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"github.com/featurebasedb/featurebase/v3/dax/boltdb"
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"github.com/featurebasedb/featurebase/v3/dax/controller"
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balancerboltdb "github.com/featurebasedb/featurebase/v3/dax/controller/balancer/boltdb"
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controllerhttp "github.com/featurebasedb/featurebase/v3/dax/controller/http"
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schemarboltdb "github.com/featurebasedb/featurebase/v3/dax/controller/schemar/boltdb"
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"github.com/featurebasedb/featurebase/v3/dax/controller/sqldb"
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"github.com/featurebasedb/featurebase/v3/errors"
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"github.com/featurebasedb/featurebase/v3/logger"
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fbnet "github.com/featurebasedb/featurebase/v3/net"
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)
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// Ensure type implements interface.
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var _ dax.Service = (*controllerService)(nil)
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type controllerService struct {
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uri *fbnet.URI
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controller *controller.Controller
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logger logger.Logger
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}
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func New(uri *fbnet.URI, cfg controller.Config) *controllerService {
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// Set up logger.
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var logr logger.Logger = logger.StderrLogger
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if cfg.Logger != nil {
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logr = cfg.Logger.WithPrefix("Controller: ")
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}
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if cfg.DataDir == "" {
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dir, err := os.MkdirTemp("", "controller_*")
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if err != nil {
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logr.Printf("Making temp dir for Controller storage: %v", err)
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os.Exit(1)
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}
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cfg.DataDir = dir
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logr.Warnf("no DataDir given (like '/path/to/directory'); using temp dir at '%s'", cfg.DataDir)
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}
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controller := controller.New(cfg)
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controllerSvc := &controllerService{
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uri: uri,
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controller: controller,
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logger: logr,
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}
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// Storage methods.
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switch cfg.StorageMethod {
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case "boltdb":
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buckets := append(schemarboltdb.SchemarBuckets, balancerboltdb.BalancerBuckets...)
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controllerDB, err := boltdb.NewSvcBolt(cfg.DataDir, "controller", buckets...)
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if err != nil {
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logr.Printf(errors.Wrap(err, "creating controller bolt").Error())
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os.Exit(1)
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}
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// Directive version.
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if err := controllerDB.InitializeBuckets(boltdb.DirectiveBuckets...); err != nil {
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logr.Panicf("initializing directive buckets: %v", err)
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}
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controller.Schemar = schemarboltdb.NewSchemar(controllerDB, logr)
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controller.Balancer = balancerboltdb.NewBalancer(controllerDB, controller.Schemar, logr)
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directiveVersion := boltdb.NewDirectiveVersion(controllerDB)
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controller.DirectiveVersion = directiveVersion
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controller.Transactor = controllerDB
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case "sqldb":
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controller.Schemar = sqldb.NewSchemar(logr)
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controller.Balancer = sqldb.NewBalancer(logr)
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controller.DirectiveVersion = sqldb.NewDirectiveVersion(logr)
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transactor, err := sqldb.Connect(cfg.SQLDB, logr)
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if err != nil {
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logr.Printf("Connecting to database: %v", err)
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os.Exit(1)
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}
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controller.Transactor = transactor
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default:
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logr.Printf("storagemethod %s not supported, try 'boltdb' or 'sqldb'", cfg.StorageMethod)
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os.Exit(1)
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}
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if cfg.Director != nil {
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controller.Director = cfg.Director
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}
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return controllerSvc
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}
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func (m *controllerService) Start() error {
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// Start controller service.
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if err := m.controller.Start(); err != nil {
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return errors.Wrap(err, "starting controller")
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}
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return nil
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}
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func (m *controllerService) Stop() error {
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err := m.controller.Stop()
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if err != nil {
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m.logger.Warnf("error stopping controller: %v", err)
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}
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return err
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}
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func (m *controllerService) Address() dax.Address {
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return dax.Address(m.uri.HostPort() + "/" + dax.ServicePrefixController)
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}
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func (m *controllerService) HTTPHandler() http.Handler {
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return controllerhttp.Handler(m.controller)
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}
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