Niklas Ye
0387e1e017
- go mod init with chi, modernc.org/sqlite, golang.org/x/crypto - Custom embedded migration runner (no CGO dependency) - Config from TERDUT_ADDR / TERDUT_DB_PATH env vars - chi router with /healthz endpoint - Graceful shutdown on SIGINT/SIGTERM
80 lines
1.9 KiB
Go
80 lines
1.9 KiB
Go
package db
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import (
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"database/sql"
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"embed"
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"fmt"
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"io/fs"
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"sort"
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"strings"
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_ "modernc.org/sqlite"
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)
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//go:embed migrations
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var migrationsFS embed.FS
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func Open(path string) (*sql.DB, error) {
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db, err := sql.Open("sqlite", path)
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if err != nil {
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return nil, err
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}
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// SQLite does not support concurrent writers; a single connection avoids locking errors.
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db.SetMaxOpenConns(1)
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if _, err := db.Exec("PRAGMA journal_mode=WAL; PRAGMA foreign_keys=ON;"); err != nil {
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db.Close()
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return nil, fmt.Errorf("set pragmas: %w", err)
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}
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if err := db.Ping(); err != nil {
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db.Close()
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return nil, fmt.Errorf("ping: %w", err)
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}
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return db, nil
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}
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func Migrate(db *sql.DB) error {
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if _, err := db.Exec(`CREATE TABLE IF NOT EXISTS schema_migrations (
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version TEXT PRIMARY KEY,
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applied_at DATETIME DEFAULT CURRENT_TIMESTAMP
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)`); err != nil {
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return fmt.Errorf("create schema_migrations: %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("read migrations dir: %w", err)
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}
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var files []string
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for _, e := range entries {
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if !e.IsDir() && strings.HasSuffix(e.Name(), ".sql") {
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files = append(files, e.Name())
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}
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}
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sort.Strings(files)
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for _, name := range files {
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var count int
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if err := db.QueryRow("SELECT COUNT(*) FROM schema_migrations WHERE version = ?", name).Scan(&count); err != nil {
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return fmt.Errorf("check migration %s: %w", name, err)
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}
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if count > 0 {
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continue
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}
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data, err := migrationsFS.ReadFile("migrations/" + name)
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if err != nil {
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return fmt.Errorf("read migration %s: %w", name, err)
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}
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if _, err := db.Exec(string(data)); err != nil {
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return fmt.Errorf("apply migration %s: %w", name, err)
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}
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if _, err := db.Exec("INSERT INTO schema_migrations (version) VALUES (?)", name); err != nil {
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return fmt.Errorf("record migration %s: %w", name, err)
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}
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}
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return nil
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}
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