workflow: migrate aus common v0.2.0 #406
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@@ -3,7 +3,7 @@ module gitea.perlbach24.de/scripte/nexarch/workflow
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go 1.25.0
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require (
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gitea.perlbach24.de/scripte/nexarch/common v0.1.0
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gitea.perlbach24.de/scripte/nexarch/common v0.2.0
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github.com/jackc/pgx/v5 v5.9.2
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)
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@@ -1,5 +1,5 @@
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gitea.perlbach24.de/scripte/nexarch/common v0.1.0 h1:biNzFr2LOMZC7b1leY3smQtrMmSMp6IW80OvR4LSjLY=
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gitea.perlbach24.de/scripte/nexarch/common v0.1.0/go.mod h1:CiEImG++QMt1xZqSMeDJhPiB7sfWTLZOwjS6OY/Iguc=
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gitea.perlbach24.de/scripte/nexarch/common v0.2.0 h1:gcOjoOvUkT0Zmqq3m7WQp1MfXSgmzrGTF2E/+NkO2bw=
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gitea.perlbach24.de/scripte/nexarch/common v0.2.0/go.mod h1:CiEImG++QMt1xZqSMeDJhPiB7sfWTLZOwjS6OY/Iguc=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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@@ -1,177 +1,27 @@
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// Package migrate implementiert Workflows Migrationsmechanik: versionierte,
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// rueckrollbare SQL-Migrationsdateien (kein ORM), mit einer
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// workflow_schema_migrations-Tabelle als Fortschrittsspeicher — dasselbe
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// Prinzip wie NEXARCH Core und DMS (internal/migrate), hier eigenstaendig
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// implementiert, da Workflow ein eigenes Go-Modul ist und die internal/-
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// Pakete der anderen Module nicht importieren kann.
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// Package migrate bindet die gemeinsame Migrationslogik aus common an den
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// modulspezifischen Fortschrittstabellennamen.
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package migrate
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"github.com/jackc/pgx/v5/pgxpool"
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cmigrate "gitea.perlbach24.de/scripte/nexarch/common/migrate"
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)
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// Migration ist eine einzelne versionierte Migrationsdatei.
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type Migration struct {
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Version string // Dateiname ohne .up.sql/.down.sql, z.B. "0001_workflow_instances"
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UpSQL string
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DownSQL string
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}
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type Migration = cmigrate.Migration
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// Load liest alle *.up.sql/*.down.sql-Paare aus dir, sortiert nach
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// Dateiname.
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func Load(dir string) ([]Migration, error) {
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entries, err := os.ReadDir(dir)
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if err != nil {
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return nil, fmt.Errorf("migrationsverzeichnis %q lesen: %w", dir, err)
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}
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var versions []string
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for _, e := range entries {
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if e.IsDir() || !strings.HasSuffix(e.Name(), ".up.sql") {
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continue
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}
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versions = append(versions, strings.TrimSuffix(e.Name(), ".up.sql"))
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}
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sort.Strings(versions)
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migrations := make([]Migration, 0, len(versions))
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for _, v := range versions {
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up, err := os.ReadFile(filepath.Join(dir, v+".up.sql"))
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if err != nil {
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return nil, fmt.Errorf("migration %q: up.sql lesen: %w", v, err)
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}
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down, err := os.ReadFile(filepath.Join(dir, v+".down.sql"))
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if err != nil {
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return nil, fmt.Errorf("migration %q: down.sql lesen (jede migration braucht ein rollback): %w", v, err)
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}
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migrations = append(migrations, Migration{Version: v, UpSQL: string(up), DownSQL: string(down)})
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}
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return migrations, nil
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}
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// TrackingTable ist modulspezifisch benannt, damit sich Module in
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// derselben Datenbank/demselben Schema nicht gegenseitig den
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// Migrationsfortschritt ueberschreiben.
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const TrackingTable = "workflow_schema_migrations"
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func ensureTrackingTable(ctx context.Context, pool *pgxpool.Pool) error {
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tx, err := pool.Begin(ctx)
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if err != nil {
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return fmt.Errorf("%s anlegen: %w", TrackingTable, err)
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}
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defer func() { _ = tx.Rollback(ctx) }()
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var migrator = cmigrate.MustNew(TrackingTable)
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if _, err := tx.Exec(ctx, `SELECT pg_advisory_xact_lock(hashtext('workflow_schema_migrations'))`); err != nil {
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return fmt.Errorf("%s anlegen: %w", TrackingTable, err)
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}
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func Load(dir string) ([]Migration, error) { return cmigrate.Load(dir) }
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if _, err := tx.Exec(ctx, `
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CREATE TABLE IF NOT EXISTS `+TrackingTable+` (
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version TEXT PRIMARY KEY,
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applied_at TIMESTAMPTZ NOT NULL DEFAULT now()
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)
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`); err != nil {
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return fmt.Errorf("%s anlegen: %w", TrackingTable, err)
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}
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return tx.Commit(ctx)
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func Up(ctx context.Context, pool *pgxpool.Pool, migrations []Migration) ([]string, error) {
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return migrator.Up(ctx, pool, migrations)
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}
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func appliedVersions(ctx context.Context, pool *pgxpool.Pool) (map[string]bool, error) {
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rows, err := pool.Query(ctx, `SELECT version FROM `+TrackingTable)
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if err != nil {
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return nil, fmt.Errorf("angewendete migrationen lesen: %w", err)
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}
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defer rows.Close()
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applied := map[string]bool{}
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for rows.Next() {
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var v string
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if err := rows.Scan(&v); err != nil {
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return nil, fmt.Errorf("migrationsversion lesen: %w", err)
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}
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applied[v] = true
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}
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return applied, rows.Err()
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}
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// Up wendet alle noch nicht angewendeten Migrationen in Reihenfolge an;
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// bereits angewendete werden uebersprungen (funktioniert auf leerer UND
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// bestehender DB).
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func Up(ctx context.Context, pool *pgxpool.Pool, migrations []Migration) (applied []string, err error) {
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if err := ensureTrackingTable(ctx, pool); err != nil {
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return nil, err
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}
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already, err := appliedVersions(ctx, pool)
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if err != nil {
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return nil, err
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}
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for _, m := range migrations {
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if already[m.Version] {
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continue
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}
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tx, err := pool.Begin(ctx)
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if err != nil {
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return applied, fmt.Errorf("transaktion fuer %q starten: %w", m.Version, err)
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}
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if _, err := tx.Exec(ctx, m.UpSQL); err != nil {
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_ = tx.Rollback(ctx)
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return applied, fmt.Errorf("migration %q anwenden: %w", m.Version, err)
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}
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if _, err := tx.Exec(ctx, `INSERT INTO `+TrackingTable+` (version) VALUES ($1)`, m.Version); err != nil {
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_ = tx.Rollback(ctx)
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return applied, fmt.Errorf("migration %q als angewendet markieren: %w", m.Version, err)
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}
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if err := tx.Commit(ctx); err != nil {
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return applied, fmt.Errorf("migration %q committen: %w", m.Version, err)
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}
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applied = append(applied, m.Version)
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}
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return applied, nil
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}
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// DownOne macht die zuletzt angewendete Migration rueckgaengig und liefert
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// deren Version, oder "" falls keine Migration angewendet war.
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func DownOne(ctx context.Context, pool *pgxpool.Pool, migrations []Migration) (version string, err error) {
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if err := ensureTrackingTable(ctx, pool); err != nil {
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return "", err
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}
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already, err := appliedVersions(ctx, pool)
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if err != nil {
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return "", err
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}
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var last *Migration
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for i := len(migrations) - 1; i >= 0; i-- {
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if already[migrations[i].Version] {
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last = &migrations[i]
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break
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}
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}
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if last == nil {
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return "", nil
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}
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tx, err := pool.Begin(ctx)
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if err != nil {
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return "", fmt.Errorf("transaktion fuer rollback von %q starten: %w", last.Version, err)
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}
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if _, err := tx.Exec(ctx, last.DownSQL); err != nil {
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_ = tx.Rollback(ctx)
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return "", fmt.Errorf("migration %q zurueckrollen: %w", last.Version, err)
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}
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if _, err := tx.Exec(ctx, `DELETE FROM `+TrackingTable+` WHERE version = $1`, last.Version); err != nil {
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_ = tx.Rollback(ctx)
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return "", fmt.Errorf("migration %q aus %s entfernen: %w", last.Version, TrackingTable, err)
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}
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if err := tx.Commit(ctx); err != nil {
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return "", fmt.Errorf("rollback von %q committen: %w", last.Version, err)
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}
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return last.Version, nil
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func DownOne(ctx context.Context, pool *pgxpool.Pool, migrations []Migration) (string, error) {
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return migrator.DownOne(ctx, pool, migrations)
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}
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Reference in new issue
Block a user