SimpleCloudNotifier/server/db/database.go

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package db
import (
scn "blackforestbytes.com/simplecloudnotifier"
"context"
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"database/sql"
_ "embed"
"errors"
"fmt"
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_ "github.com/mattn/go-sqlite3"
)
//go:embed schema_1.0.sql
var schema_1_0 string
//go:embed schema_2.0.sql
var schema_2_0 string
func NewDatabase(ctx context.Context, conf scn.Config) (*sql.DB, error) {
db, err := sql.Open("sqlite3", conf.DBFile)
if err != nil {
return nil, err
}
schema, err := getSchemaFromDB(ctx, db)
if schema == 0 {
_, err = db.ExecContext(ctx, schema_1_0)
if err != nil {
return nil, err
}
return db, nil
} else if schema == 1 {
return nil, errors.New("cannot autom. upgrade schema 1")
} else if schema == 2 {
return db, nil
} else {
return nil, errors.New(fmt.Sprintf("Unknown DB schema: %d", schema))
}
}
func getSchemaFromDB(ctx context.Context, db *sql.DB) (int, error) {
r1, err := db.QueryContext(ctx, "SELECT name FROM sqlite_master WHERE type='table' AND name='meta'")
if err != nil {
return 0, err
}
if !r1.Next() {
return 0, nil
}
r2, err := db.QueryContext(ctx, "SELECT value_int FROM meta WHERE key='schema'")
if err != nil {
return 0, err
}
if !r2.Next() {
return 0, errors.New("no schema entry in meta table")
}
var schema int
err = r2.Scan(&schema)
if err != nil {
return 0, err
}
return schema, nil
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}