/
postgres.go
70 lines (57 loc) · 1.82 KB
/
postgres.go
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package storage
import (
"embed"
"fmt"
"github.com/golang-migrate/migrate/v4"
"github.com/golang-migrate/migrate/v4/database/postgres"
"github.com/golang-migrate/migrate/v4/source/iofs"
// postgres
_ "github.com/lib/pq"
)
//go:embed migrations/postgres/*.sql
var pgFS embed.FS
// PostgresManager implements DatabaseManager interface
type PostgresManager struct {
DbManager
}
// NewPostgresManager creates new PostgresManager with connection string and chunk size
func NewPostgresManager(pgConnStr string, chunkSize int, withoutTimescale bool) (*PostgresManager, error) {
manager := &PostgresManager{
DbManager{
defaultStart: "NOW() - interval '30 days'",
nearestDayClause: "abs(extract(epoch from timestamp - %s::timestamptz))",
saveChunkSize: chunkSize,
},
}
pg, err := obtainConnection("postgres", pgConnStr, 2, 60)
if err != nil {
return nil, fmt.Errorf("failed to init postgres: %w", err)
}
manager.db = pg
// Run migrations
driver, err := postgres.WithInstance(pg.DB, &postgres.Config{})
if err != nil {
return nil, fmt.Errorf("failed to create migration db driver: %w", err)
}
d, err := iofs.New(pgFS, "migrations/postgres")
if err != nil {
return nil, fmt.Errorf("failed to create migration iofs source: %w", err)
}
migrations, err := migrate.NewWithInstance("iofs", d, "postgres", driver)
if err != nil {
return nil, fmt.Errorf("failed to create migration: %w", err)
}
_, _, err = migrations.Version()
shouldCreateHypertable := err == migrate.ErrNilVersion && !withoutTimescale
err = migrations.Up()
if err != nil && err != migrate.ErrNoChange {
return nil, fmt.Errorf("failed to run migrations: %w", err)
}
if shouldCreateHypertable {
_, err = pg.Exec(`SELECT create_hypertable('measurements', 'timestamp');`)
if err != nil {
return nil, err
}
}
return manager, nil
}