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"
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"time"
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)
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//go:embed schema_1.ddl
var schema1 string
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//go:embed schema_2.ddl
var schema2 string
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//go:embed schema_3.ddl
var schema3 string
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type Database struct {
db *sql.DB
}
func NewDatabase(conf scn.Config) (*Database, error) {
db, err := sql.Open("sqlite3", conf.DBFile)
if err != nil {
return nil, err
}
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return &Database{db}, nil
}
func (db *Database) Migrate(ctx context.Context) error {
ctx, cancel := context.WithTimeout(context.Background(), 24*time.Second)
defer cancel()
schema, err := db.ReadSchema(ctx)
if schema == 0 {
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_, err = db.db.ExecContext(ctx, schema3)
if err != nil {
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return err
}
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return nil
} else if schema == 1 {
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return errors.New("cannot autom. upgrade schema 1")
} else if schema == 2 {
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return errors.New("cannot autom. upgrade schema 2") //TODO
} else if schema == 3 {
return nil // current
} else {
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return errors.New(fmt.Sprintf("Unknown DB schema: %d", schema))
}
}
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func (db *Database) ReadSchema(ctx context.Context) (int, error) {
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r1, err := db.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
}
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r2, err := db.db.QueryContext(ctx, "SELECT value_int FROM meta WHERE meta_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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}
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func (db *Database) Ping() error {
return db.db.Ping()
}
func (db *Database) BeginTx(ctx context.Context) (*sql.Tx, error) {
return db.db.BeginTx(ctx, nil)
}