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https://github.com/featurebasedb/featurebase.git
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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.
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
package sqldb
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import (
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"github.com/featurebasedb/featurebase/v3/dax"
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"github.com/featurebasedb/featurebase/v3/dax/controller/balancer"
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"github.com/featurebasedb/featurebase/v3/dax/models"
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"github.com/featurebasedb/featurebase/v3/logger"
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"github.com/pkg/errors"
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)
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func NewFreeWorkerService(log logger.Logger) balancer.FreeWorkerService {
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if log == nil {
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log = logger.NopLogger
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}
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return &freeWorkerService{
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log: log,
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}
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}
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type freeWorkerService struct {
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log logger.Logger
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}
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func (fw *freeWorkerService) AddWorkers(tx dax.Transaction, roleType dax.RoleType, addrs ...dax.Address) error {
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dt, ok := tx.(*DaxTransaction)
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if !ok {
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return dax.NewErrInvalidTransaction("*sqldb.DaxTransaction")
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}
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workers := make(models.Workers, len(addrs))
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for i, addr := range addrs {
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workers[i] = models.Worker{
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Address: addr,
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Role: roleType,
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}
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}
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err := dt.C.Create(workers)
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return errors.Wrap(err, "creating workers")
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}
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func (fw *freeWorkerService) RemoveWorker(tx dax.Transaction, roleType dax.RoleType, addr dax.Address) error {
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dt, ok := tx.(*DaxTransaction)
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if !ok {
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return dax.NewErrInvalidTransaction("*sqldb.DaxTransaction")
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}
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err := dt.C.RawQuery("DELETE from workers where database_id is null and role = ? and address = ?", roleType, addr).Exec()
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return errors.Wrap(err, "deleting")
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}
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func (fw *freeWorkerService) PopWorkers(tx dax.Transaction, roleType dax.RoleType, num int) ([]dax.Address, error) {
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dt, ok := tx.(*DaxTransaction)
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if !ok {
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return nil, dax.NewErrInvalidTransaction("*sqldb.DaxTransaction")
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}
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results := make([]struct {
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Address dax.Address `db:"address"`
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}, 0, num)
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err := dt.C.RawQuery("select address from workers where role = ? and database_id is NULL limit ?", roleType, num).All(&results)
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if err != nil {
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return nil, errors.Wrap(err, "querying")
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}
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if len(results) < num {
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return nil, errors.Errorf("not enough free workers to get: wanted %d, have: %d", num, len(results))
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}
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ret := make([]dax.Address, num)
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for i, res := range results {
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ret[i] = res.Address
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}
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return ret, nil
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}
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func (fw *freeWorkerService) ListWorkers(tx dax.Transaction, roleType dax.RoleType) (dax.Addresses, error) {
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dt, ok := tx.(*DaxTransaction)
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if !ok {
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return nil, dax.NewErrInvalidTransaction("*sqldb.DaxTransaction")
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}
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workers := make(models.Workers, 0)
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err := dt.C.Select("address").Where("role = ? and database_id is NULL", roleType).Order("address asc").All(&workers)
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if err != nil {
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return nil, errors.Wrap(err, "querying for workers")
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}
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ret := make(dax.Addresses, len(workers))
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for i, w := range workers {
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ret[i] = w.Address
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}
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return ret, nil
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}
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