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Monorepo for Tangled
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2.7 kB · 102 lines
Go
at master
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103package db
import ( "database/sql")
// GetOrAssignOwnerUID returns the virtual UID for ownerDID, minting a new one// from the uid_counter table if this owner has not been seen before.// UIDs start at 100000 and increment by one per unique owner.//// A process-wide mutex serialises concurrent callers so two simultaneous// requests for distinct DIDs do not race to claim the same counter value.// The mutex is local to this DB instance and SQLite itself only permits one// writer at a time, so this does not impede throughput in practice.func (d *DB) GetOrAssignOwnerUID(ownerDID string) (uint32, error) { d.uidAssignMu.Lock() defer d.uidAssignMu.Unlock()
tx, err := d.db.Begin() if err != nil { return 0, err } defer tx.Rollback()
var uid uint32 err = tx.QueryRow( `SELECT uid FROM owner_uid_assignments WHERE owner_did = ?`, ownerDID, ).Scan(&uid) if err == nil { return uid, tx.Commit() } if err != sql.ErrNoRows { return 0, err }
if err := tx.QueryRow(`SELECT next_uid FROM uid_counter`).Scan(&uid); err != nil { return 0, err } if _, err := tx.Exec(`UPDATE uid_counter SET next_uid = next_uid + 1`); err != nil { return 0, err } if _, err := tx.Exec( `INSERT INTO owner_uid_assignments (owner_did, uid) VALUES (?, ?)`, ownerDID, uid, ); err != nil { return 0, err }
return uid, tx.Commit()}
// AllReposForMigration returns all (repo_did, owner_did) pairs with a// non-null owner. Pass force=true to include already-migrated repos.func (d *DB) AllReposForMigration(force bool) ([]RepoMigrationRow, error) { query := `SELECT repo_did, owner_did FROM repo_keys WHERE owner_did IS NOT NULL` if !force { query += ` AND isolated_at IS NULL` } rows, err := d.db.Query(query) if err != nil { return nil, err } defer rows.Close()
var result []RepoMigrationRow for rows.Next() { var r RepoMigrationRow if err := rows.Scan(&r.RepoDID, &r.OwnerDID); err != nil { return nil, err } result = append(result, r) } return result, rows.Err()}
// CountUnmigratedRepos returns the number of repos that have not yet been// isolation-migrated.func (d *DB) CountUnmigratedRepos() (int, error) { var n int err := d.db.QueryRow(` SELECT count(1) FROM repo_keys WHERE owner_did IS NOT NULL AND isolated_at IS NULL `).Scan(&n) return n, err}
// MarkRepoIsolated sets isolated_at to the current time for repoDID.func (d *DB) MarkRepoIsolated(repoDID string) error { _, err := d.db.Exec( `UPDATE repo_keys SET isolated_at = strftime('%Y-%m-%dT%H:%M:%SZ','now') WHERE repo_did = ?`, repoDID, ) return err}
// RepoMigrationRow is a row returned by AllReposForMigration.type RepoMigrationRow struct { RepoDID string OwnerDID string}