Esa Kataja
80f82a82de
Step 1 of the build order in docs/decisions.md. Boots, applies migrations before serving, and serves a health check and an empty admin page. - 001_init.sql is the full schema from docs/spec.md, including the check constraints and indexes the old app lacked - The startup sweep fails submissions left mid-conversion by a restart; an in-process goroutine dies with the process and those rows would otherwise say converting forever - Admin is Basic Auth from env on its own listener, fatal at startup when ADMIN_PASSWORD is unset
118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
package main
|
|
|
|
import (
|
|
"context"
|
|
"embed"
|
|
"fmt"
|
|
"log/slog"
|
|
"sort"
|
|
|
|
"github.com/jackc/pgx/v5/pgxpool"
|
|
)
|
|
|
|
//go:embed migrations/*.sql
|
|
var migrationFS embed.FS
|
|
|
|
// migrate applies every migrations/*.sql not yet recorded, in filename order, each in its own
|
|
// transaction. Applied names are the record — a file that changes after it ran is not re-applied.
|
|
func migrate(ctx context.Context, pool *pgxpool.Pool) error {
|
|
_, err := pool.Exec(ctx, `create table if not exists schema_migrations (
|
|
name text primary key,
|
|
applied_at timestamptz not null default now()
|
|
)`)
|
|
if err != nil {
|
|
return fmt.Errorf("create schema_migrations: %w", err)
|
|
}
|
|
|
|
applied := map[string]bool{}
|
|
rows, err := pool.Query(ctx, `select name from schema_migrations`)
|
|
if err != nil {
|
|
return fmt.Errorf("read schema_migrations: %w", err)
|
|
}
|
|
defer rows.Close()
|
|
for rows.Next() {
|
|
var name string
|
|
if err := rows.Scan(&name); err != nil {
|
|
return err
|
|
}
|
|
applied[name] = true
|
|
}
|
|
if err := rows.Err(); err != nil {
|
|
return err
|
|
}
|
|
rows.Close()
|
|
|
|
entries, err := migrationFS.ReadDir("migrations")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
names := make([]string, 0, len(entries))
|
|
for _, e := range entries {
|
|
names = append(names, e.Name())
|
|
}
|
|
sort.Strings(names)
|
|
|
|
for _, name := range names {
|
|
if applied[name] {
|
|
continue
|
|
}
|
|
sql, err := migrationFS.ReadFile("migrations/" + name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tx, err := pool.Begin(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err := tx.Exec(ctx, string(sql)); err != nil {
|
|
tx.Rollback(ctx)
|
|
return fmt.Errorf("migration %s: %w", name, err)
|
|
}
|
|
if _, err := tx.Exec(ctx, `insert into schema_migrations (name) values ($1)`, name); err != nil {
|
|
tx.Rollback(ctx)
|
|
return err
|
|
}
|
|
if err := tx.Commit(ctx); err != nil {
|
|
return fmt.Errorf("migration %s: %w", name, err)
|
|
}
|
|
slog.Info("migration applied", "ctx", "startup", "name", name)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// sweep runs the startup cleanup from docs/spec.md §4.6. An in-process conversion goroutine dies
|
|
// with the process, so without this those rows say "converting" forever.
|
|
func sweep(ctx context.Context, pool *pgxpool.Pool) error {
|
|
tag, err := pool.Exec(ctx, `update submissions
|
|
set status = 'failed', status_msg = 'interrupted by restart'
|
|
where status in ('queued', 'downloading', 'converting')`)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if n := tag.RowsAffected(); n > 0 {
|
|
slog.Warn("submissions interrupted by restart", "ctx", "startup", "count", n)
|
|
}
|
|
|
|
// ponytail: temp files of swept submissions are unlinked with the row in step 3, once the
|
|
// pipeline exists and there is something to unlink.
|
|
if _, err := pool.Exec(ctx,
|
|
`delete from submissions where created_at < now() - interval '7 days'`); err != nil {
|
|
return err
|
|
}
|
|
if _, err := pool.Exec(ctx, `delete from sessions where expires_at < now()`); err != nil {
|
|
return err
|
|
}
|
|
|
|
var failed int
|
|
err = pool.QueryRow(ctx, `select count(*) from submissions where status = 'failed'`).Scan(&failed)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if failed > 0 {
|
|
// A failed submission is invisible to everyone but its submitter, so a broken pipeline
|
|
// has no other way of announcing itself.
|
|
slog.Warn("failed submissions present", "ctx", "startup", "count", failed)
|
|
}
|
|
return nil
|
|
}
|