From 427cc77fa3633aca7c4c3377fa26b0e70921a7b5 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Mon, 6 May 2024 00:18:22 +0200
Subject: [golang] bootstrapped a client in yet another language

---
 golang/pkg/database/migrations.go | 78 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 golang/pkg/database/migrations.go

(limited to 'golang/pkg/database/migrations.go')

diff --git a/golang/pkg/database/migrations.go b/golang/pkg/database/migrations.go
new file mode 100644
index 0000000..94207a5
--- /dev/null
+++ b/golang/pkg/database/migrations.go
@@ -0,0 +1,78 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+	"io/fs"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type DB struct {
+	ctx context.Context
+	db  *sql.DB
+}
+
+//go:embed sql/*.sql
+var schemaFiles embed.FS
+
+func DBInit(ctx context.Context, url string) (myDB *DB, err error) {
+	var db *sql.DB
+	if db, err = sql.Open("sqlite3", url); err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err != nil {
+			_ = db.Close()
+		}
+	}()
+
+	if _, err = db.ExecContext(ctx, "PRAGMA foreign_keys = ON"); err != nil {
+		return nil, err
+	}
+	if _, err = db.ExecContext(ctx, "PRAGMA journal_mode = WAL"); err != nil {
+		return nil, err
+	}
+
+	var version int
+	if err = db.QueryRowContext(ctx, `SELECT version FROM schema_version;`).Scan(&version); err != nil {
+		if err.Error() == "no such table: schema_version" {
+			version = 0
+		} else {
+			return nil, err
+		}
+	}
+
+	statements := make([]string, 0)
+	err = fs.WalkDir(schemaFiles, ".", func(path string, d fs.DirEntry, err error) error {
+		if d.IsDir() || err != nil {
+			return err
+		}
+		var stmts []byte
+		if stmts, err = schemaFiles.ReadFile(path); err != nil {
+			return err
+		} else {
+			statements = append(statements, string(stmts))
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	for version < len(statements) {
+		if _, err = db.ExecContext(ctx, statements[version]); err != nil {
+			return nil, err
+		}
+		version++
+	}
+	if _, err = db.ExecContext(ctx, `DELETE FROM schema_version; INSERT INTO schema_version (version) VALUES (?);`, version); err != nil {
+		return nil, err
+	}
+	return &DB{ctx: ctx, db: db}, nil
+}
+
+func (db *DB) Close() error {
+	return db.db.Close()
+}
-- 
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