Esa Kataja
1fe5211ae6
Ten members and a handful of songs a week never needed a database server,
and the server was the last thing making this a two-container deployment.
modernc.org/sqlite is pure Go, so CGO_ENABLED=0 survives and the dependency
count is unchanged: pgx out, sqlite in.
The port stayed small because the driver matches $1-style placeholders
against argument ordinals exactly as pgx does, so no query needed rewriting
for parameters. What did change:
- timestamptz becomes timestamp holding UTC 'YYYY-MM-DD HH:MM:SS'. The
declared type is what makes the driver return time.Time, and the
fixed-width UTC string is what makes ordering and comparison against
datetime('now') mean what they say.
- interval has no equivalent: sessions.idle_ttl is seconds, and the review
edit window travels as a SQLite date modifier string.
- No stddev_pop, so the divisive and unified boards spell the population
formula out, guarded with max(0.0, ...) because cancellation returns a
tiny negative when every score is identical.
- foreign_keys is off by default, so the cascades only exist because the
pragma is set on every connection.
Drops the postgres service, its healthcheck, the depends_on gate, the
startup retry loop and POSTGRES_PASSWORD. ./storage is now the whole
backup. Tests get a fresh database file per test and run everywhere
instead of skipping without TEST_DATABASE_URL.
119 lines
3.2 KiB
Go
119 lines
3.2 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"embed"
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"fmt"
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"log/slog"
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"sort"
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)
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//go:embed migrations/*.sql
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var migrationFS embed.FS
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// migrate applies every migrations/*.sql not yet recorded, in filename order, each in its own
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// transaction. Applied names are the record — a file that changes after it ran is not re-applied.
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func migrate(ctx context.Context, db *sql.DB) error {
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_, err := db.ExecContext(ctx, `create table if not exists schema_migrations (
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name text primary key,
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applied_at timestamp not null default (datetime('now'))
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)`)
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if err != nil {
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return fmt.Errorf("create schema_migrations: %w", err)
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}
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applied := map[string]bool{}
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rows, err := db.QueryContext(ctx, `select name from schema_migrations`)
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if err != nil {
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return fmt.Errorf("read schema_migrations: %w", err)
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}
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defer rows.Close()
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for rows.Next() {
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var name string
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if err := rows.Scan(&name); err != nil {
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return err
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}
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applied[name] = true
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}
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if err := rows.Err(); err != nil {
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return err
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}
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rows.Close()
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entries, err := migrationFS.ReadDir("migrations")
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if err != nil {
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return err
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}
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names := make([]string, 0, len(entries))
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for _, e := range entries {
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names = append(names, e.Name())
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}
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sort.Strings(names)
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for _, name := range names {
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if applied[name] {
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continue
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}
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sql, err := migrationFS.ReadFile("migrations/" + name)
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if err != nil {
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return err
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}
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tx, err := db.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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if _, err := tx.ExecContext(ctx, string(sql)); err != nil {
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tx.Rollback()
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return fmt.Errorf("migration %s: %w", name, err)
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}
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if _, err := tx.ExecContext(ctx, `insert into schema_migrations (name) values ($1)`, name); err != nil {
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tx.Rollback()
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return err
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}
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if err := tx.Commit(); err != nil {
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return fmt.Errorf("migration %s: %w", name, err)
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}
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slog.Info("migration applied", "ctx", "startup", "name", name)
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}
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return nil
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}
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// sweep runs the startup cleanup from docs/spec.md §4.6. An in-process conversion goroutine dies
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// with the process, so without this those rows say "converting" forever.
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func sweep(ctx context.Context, db *sql.DB) error {
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res, err := db.ExecContext(ctx, `update submissions
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set status = 'failed', status_msg = 'interrupted by restart'
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where status in ('queued', 'downloading', 'converting')`)
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if err != nil {
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return err
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}
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if n := affected(res); n > 0 {
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slog.Warn("submissions interrupted by restart", "ctx", "startup", "count", n)
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}
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// ponytail: temp files of swept submissions are unlinked with the row in step 3, once the
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// pipeline exists and there is something to unlink.
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if _, err := db.ExecContext(ctx,
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`delete from submissions where created_at < datetime('now', '-7 days')`); err != nil {
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return err
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}
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if _, err := db.ExecContext(ctx,
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`delete from sessions where expires_at < datetime('now')`); err != nil {
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return err
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}
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var failed int
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err = db.QueryRowContext(ctx,
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`select count(*) from submissions where status = 'failed'`).Scan(&failed)
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if err != nil {
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return err
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}
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if failed > 0 {
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// A failed submission is invisible to everyone but its submitter, so a broken pipeline
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// has no other way of announcing itself.
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slog.Warn("failed submissions present", "ctx", "startup", "count", failed)
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}
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return nil
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}
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