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cadencesql.go
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cadencesql.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package esql
import (
"bytes"
"encoding/json"
"fmt"
"github.com/xwb1989/sqlparser"
)
// SetCadence ... specify whether do special handling for cadence visibility
// should not be called if there is potential race condition
// should not be called by non-cadence user
func (e *ESql) SetCadence(cadenceArg bool) {
e.cadence = cadenceArg
}
// ConvertPrettyCadence ...
// convert sql to es dsl, for cadence usage
func (e *ESql) ConvertPrettyCadence(sql string, domainID string, pagination ...interface{}) (dsl string, sortFields []string, err error) {
dsl, sortFields, err = e.ConvertCadence(sql, domainID, pagination...)
if err != nil {
return "", nil, err
}
var prettifiedDSLBytes bytes.Buffer
err = json.Indent(&prettifiedDSLBytes, []byte(dsl), "", " ")
if err != nil {
return "", nil, err
}
return prettifiedDSLBytes.String(), sortFields, err
}
// ConvertCadence ...
// convert sql to es dsl, for cadence usage
func (e *ESql) ConvertCadence(sql string, domainID string, pagination ...interface{}) (dsl string, sortFields []string, err error) {
if !e.cadence {
err = fmt.Errorf(`esql: cadence option not turned on`)
return "", nil, err
}
stmt, err := sqlparser.Parse(sql)
if err != nil {
return "", nil, err
}
// sql valid, start to handle
switch stmt := stmt.(type) {
case *sqlparser.Select:
dsl, sortFields, err = e.convertSelect(*(stmt), domainID, pagination...)
default:
err = fmt.Errorf(`esql: Queries other than select not supported`)
}
if err != nil {
return "", nil, err
}
return dsl, sortFields, nil
}