84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
package database
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import (
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"context"
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"embed"
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"fmt"
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"io/fs"
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"log"
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"sort"
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"strings"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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//go:embed migrations/*.sql
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var migrationsFS embed.FS
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func Migrate(ctx context.Context, pool *pgxpool.Pool) error {
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_, err := pool.Exec(ctx, `
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CREATE TABLE IF NOT EXISTS schema_migrations (
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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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`)
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if err != nil {
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return fmt.Errorf("creating migrations table: %w", err)
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}
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entries, err := fs.ReadDir(migrationsFS, "migrations")
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if err != nil {
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return fmt.Errorf("reading migrations directory: %w", err)
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}
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// Sort by filename to ensure order.
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sort.Slice(entries, func(i, j int) bool {
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return entries[i].Name() < entries[j].Name()
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})
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for _, entry := range entries {
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if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".sql") {
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continue
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}
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version := strings.TrimSuffix(entry.Name(), ".sql")
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var exists bool
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err := pool.QueryRow(ctx, "SELECT EXISTS(SELECT 1 FROM schema_migrations WHERE version = $1)", version).Scan(&exists)
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if err != nil {
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return fmt.Errorf("checking migration %s: %w", version, err)
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}
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if exists {
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continue
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}
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sql, err := migrationsFS.ReadFile("migrations/" + entry.Name())
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if err != nil {
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return fmt.Errorf("reading migration %s: %w", version, err)
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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("beginning transaction for %s: %w", version, err)
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}
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if _, err := tx.Exec(ctx, string(sql)); err != nil {
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tx.Rollback(ctx)
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return fmt.Errorf("executing migration %s: %w", version, err)
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}
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if _, err := tx.Exec(ctx, "INSERT INTO schema_migrations (version) VALUES ($1)", version); err != nil {
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tx.Rollback(ctx)
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return fmt.Errorf("recording migration %s: %w", version, err)
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}
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if err := tx.Commit(ctx); err != nil {
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return fmt.Errorf("committing migration %s: %w", version, err)
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}
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log.Printf("Applied migration: %s", version)
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}
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return nil
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}
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