Lay groundwork and move sessions to 'store'

internal/store/db/db.go

@@ -0,0 +1,100 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+	"github.com/aclindsa/gorp"
+	"github.com/aclindsa/moneygo/internal/config"
+	"github.com/aclindsa/moneygo/internal/models"
+	"github.com/aclindsa/moneygo/internal/store"
+	_ "github.com/go-sql-driver/mysql"
+	_ "github.com/lib/pq"
+	_ "github.com/mattn/go-sqlite3"
+	"log"
+	"strings"
+)
+
+// luaMaxLengthBuffer is intended to be enough bytes such that a given string
+// no longer than models.LuaMaxLength is sure to fit within a database
+// implementation's string type specified by the same.
+const luaMaxLengthBuffer int = 4096
+
+func GetDbMap(db *sql.DB, dbtype config.DbType) (*gorp.DbMap, error) {
+	var dialect gorp.Dialect
+	if dbtype == config.SQLite {
+		dialect = gorp.SqliteDialect{}
+	} else if dbtype == config.MySQL {
+		dialect = gorp.MySQLDialect{
+			Engine:   "InnoDB",
+			Encoding: "UTF8",
+		}
+	} else if dbtype == config.Postgres {
+		dialect = gorp.PostgresDialect{
+			LowercaseFields: true,
+		}
+	} else {
+		return nil, fmt.Errorf("Don't know gorp dialect to go with '%s' DB type", dbtype.String())
+	}
+
+	dbmap := &gorp.DbMap{Db: db, Dialect: dialect}
+	dbmap.AddTableWithName(models.User{}, "users").SetKeys(true, "UserId")
+	dbmap.AddTableWithName(models.Session{}, "sessions").SetKeys(true, "SessionId")
+	dbmap.AddTableWithName(models.Account{}, "accounts").SetKeys(true, "AccountId")
+	dbmap.AddTableWithName(models.Security{}, "securities").SetKeys(true, "SecurityId")
+	dbmap.AddTableWithName(models.Transaction{}, "transactions").SetKeys(true, "TransactionId")
+	dbmap.AddTableWithName(models.Split{}, "splits").SetKeys(true, "SplitId")
+	dbmap.AddTableWithName(models.Price{}, "prices").SetKeys(true, "PriceId")
+	rtable := dbmap.AddTableWithName(models.Report{}, "reports").SetKeys(true, "ReportId")
+	rtable.ColMap("Lua").SetMaxSize(models.LuaMaxLength + luaMaxLengthBuffer)
+
+	err := dbmap.CreateTablesIfNotExists()
+	if err != nil {
+		return nil, err
+	}
+
+	return dbmap, nil
+}
+
+func GetDSN(dbtype config.DbType, dsn string) string {
+	if dbtype == config.MySQL && !strings.Contains(dsn, "parseTime=true") {
+		log.Fatalf("The DSN for MySQL MUST contain 'parseTime=True' but does not!")
+	}
+	return dsn
+}
+
+type DbStore struct {
+	DbMap *gorp.DbMap
+}
+
+func (db *DbStore) Begin() (store.Tx, error) {
+	tx, err := db.DbMap.Begin()
+	if err != nil {
+		return nil, err
+	}
+	return &Tx{db.DbMap.Dialect, tx}, nil
+}
+
+func (db *DbStore) Close() error {
+	err := db.DbMap.Db.Close()
+	db.DbMap = nil
+	return err
+}
+
+func GetStore(dbtype config.DbType, dsn string) (store *DbStore, err error) {
+	dsn = GetDSN(dbtype, dsn)
+	database, err := sql.Open(dbtype.String(), dsn)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err != nil {
+			database.Close()
+		}
+	}()
+
+	dbmap, err := GetDbMap(database, dbtype)
+	if err != nil {
+		return nil, err
+	}
+	return &DbStore{dbmap}, nil
+}