/
transaction.go
149 lines (138 loc) · 3.92 KB
/
transaction.go
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package generators
import (
"context"
"database/sql"
"fmt"
"github.com/aacfactory/errors"
"github.com/aacfactory/gcg"
"strings"
)
// TransactionWriter
// @postgres:transaction {readonly} {isolation}
// isolation:
// - ReadCommitted
// - ReadUncommitted
// - WriteCommitted
// - RepeatableRead
// - Snapshot
// - Serializable
// - Linearizable
type TransactionWriter struct {
}
func (writer *TransactionWriter) Annotation() (annotation string) {
return "postgres:transaction"
}
func (writer *TransactionWriter) HandleBefore(ctx context.Context, params []string, hasFnParam bool, hasFnResult bool) (code gcg.Code, err error) {
paramsLen := len(params)
if paramsLen > 2 {
err = errors.Warning("sql: generate transaction code failed").WithCause(fmt.Errorf("invalid annotation params"))
return
}
readonly := false
isolationParam := ""
isolation := sql.LevelDefault
if paramsLen == 2 {
if strings.ToLower(params[0]) != "readonly" {
err = errors.Warning("sql: generate transaction code failed").WithCause(fmt.Errorf("invalid annotation params"))
return
}
readonly = true
isolationParam = strings.ToLower(params[1])
} else if paramsLen == 1 {
param := strings.ToLower(params[0])
if param == "readonly" {
readonly = true
} else {
isolationParam = strings.ToLower(params[0])
}
}
if isolationParam != "" {
switch isolationParam {
case "readcommitted":
isolation = sql.LevelReadCommitted
break
case "readuncommitted":
isolation = sql.LevelReadUncommitted
break
case "writecommitted":
isolation = sql.LevelWriteCommitted
break
case "repeatableread":
isolation = sql.LevelRepeatableRead
break
case "snapshot":
isolation = sql.LevelSnapshot
break
case "serializable":
isolation = sql.LevelSerializable
break
case "Linearizable":
isolation = sql.LevelLinearizable
break
default:
err = errors.Warning("sql: generate transaction code failed").WithCause(fmt.Errorf("invalid isolation params"))
return
}
}
stmt := gcg.Statements()
stmt.Tab().Token("if err = postgres.Begin(ctx")
if readonly {
stmt.Token(", postgres.Readonly()")
}
if isolation != sql.LevelDefault {
stmt.Token(", postgres.WithIsolation(")
switch isolation {
case sql.LevelReadCommitted:
stmt.Token("postgres.LevelReadCommitted")
break
case sql.LevelReadUncommitted:
stmt.Token("postgres.LevelReadUncommitted")
break
case sql.LevelWriteCommitted:
stmt.Token("postgres.LevelWriteCommitted")
break
case sql.LevelRepeatableRead:
stmt.Token("postgres.LevelRepeatableRead")
break
case sql.LevelSnapshot:
stmt.Token("postgres.LevelSnapshot")
break
case sql.LevelSerializable:
stmt.Token("postgres.LevelSerializable")
break
case sql.LevelLinearizable:
stmt.Token("postgres.LevelLinearizable")
break
default:
stmt.Token("postgres.LevelDefault")
break
}
stmt.Token(")")
}
stmt.Token("); err != nil {",
gcg.NewPackage("github.com/aacfactory/fns-contrib/databases/postgres"),
).Line()
stmt.Tab().Tab().Token("return")
stmt.Tab().Token("}")
code = stmt
return
}
func (writer *TransactionWriter) HandleAfter(ctx context.Context, params []string, hasFnParam bool, hasFnResult bool) (code gcg.Code, err error) {
stmt := gcg.Statements()
stmt.Tab().Token("if err == nil {").Line()
stmt.Tab().Tab().Token("if cmtErr := postgres.Commit(ctx); cmtErr != nil {").Line()
stmt.Tab().Tab().Tab().Token("err = cmtErr").Line()
stmt.Tab().Tab().Tab().Token("return").Line()
stmt.Tab().Tab().Token("}").Line()
stmt.Tab().Token("} else {").Line()
stmt.Tab().Tab().Token("postgres.Rollback(ctx)").Line()
stmt.Tab().Token("}").Line()
code = stmt
return
}
func (writer *TransactionWriter) ProxyBefore(ctx context.Context, params []string, hasFnParam bool, hasFnResult bool) (code gcg.Code, err error) {
return
}
func (writer *TransactionWriter) ProxyAfter(ctx context.Context, params []string, hasFnParam bool, hasFnResult bool) (code gcg.Code, err error) {
return
}