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session.go
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session.go
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/*
*
* Copyright (c) 2020 vesoft inc. All rights reserved.
*
* This source code is licensed under Apache 2.0 License.
*
*/
package nebula_go
import (
"fmt"
"github.com/facebook/fbthrift/thrift/lib/go/thrift"
"github.com/vesoft-inc/nebula-go/v2/nebula"
graph "github.com/vesoft-inc/nebula-go/v2/nebula/graph"
)
type timezoneInfo struct {
offset int32
name []byte
}
type Session struct {
sessionID int64
connection *connection
connPool *ConnectionPool
log Logger
timezoneInfo
}
// Execute returns the result of the given query as a ResultSet
func (session *Session) Execute(stmt string) (*ResultSet, error) {
if session.connection == nil {
return nil, fmt.Errorf("failed to execute: Session has been released")
}
resp, err := session.connection.execute(session.sessionID, stmt)
if err == nil {
resSet, err := genResultSet(resp, session.timezoneInfo)
if err != nil {
return nil, err
}
return resSet, nil
}
// Reconnect only if the tranport is closed
err2, ok := err.(thrift.TransportException)
if !ok {
return nil, err
}
if err2.TypeID() == thrift.END_OF_FILE {
_err := session.reConnect()
if _err != nil {
session.log.Error(fmt.Sprintf("Failed to reconnect, %s", _err.Error()))
return nil, _err
}
session.log.Info(fmt.Sprintf("Successfully reconnect to host: %s, port: %d",
session.connection.severAddress.Host, session.connection.severAddress.Port))
// Execute with the new connetion
resp, err := session.connection.execute(session.sessionID, stmt)
if err != nil {
return nil, err
}
resSet, err := genResultSet(resp, session.timezoneInfo)
if err != nil {
return nil, err
}
return resSet, nil
} else { // No need to reconnect
session.log.Error(fmt.Sprintf("Error info: %s", err2.Error()))
return nil, err2
}
}
// ExecuteJson returns the result of the given query as a json string
// Date and Datetime will be returned in UTC
// JSON struct:
// {
// "results":[
// {
// "columns":[
// ],
// "data":[
// {
// "row":[
// "row-data"
// ],
// "meta":[
// "metadata"
// ]
// }
// ],
// "latencyInUs":0,
// "spaceName":"",
// "planDesc ":{
// "planNodeDescs":[
// {
// "name":"",
// "id":0,
// "outputVar":"",
// "description":{
// "key":""
// },
// "profiles":[
// {
// "rows":1,
// "execDurationInUs":0,
// "totalDurationInUs":0,
// "otherStats":{}
// }
// ],
// "branchInfo":{
// "isDoBranch":false,
// "conditionNodeId":-1
// },
// "dependencies":[]
// }
// ],
// "nodeIndexMap":{},
// "format":"",
// "optimize_time_in_us":0
// },
// "comment ":""
// }
// ],
// "errors":[
// {
// "code": 0,
// "message": ""
// }
// ]
// }
func (session *Session) ExecuteJson(stmt string) ([]byte, error) {
if session.connection == nil {
return nil, fmt.Errorf("failed to execute: Session has been released")
}
resp, err := session.connection.executeJson(session.sessionID, stmt)
if err == nil {
return resp, nil
}
// Reconnect only if the tranport is closed
err2, ok := err.(thrift.TransportException)
if !ok {
return nil, err
}
if err2.TypeID() == thrift.END_OF_FILE {
_err := session.reConnect()
if _err != nil {
session.log.Error(fmt.Sprintf("Failed to reconnect, %s", _err.Error()))
return nil, _err
}
session.log.Info(fmt.Sprintf("Successfully reconnect to host: %s, port: %d",
session.connection.severAddress.Host, session.connection.severAddress.Port))
// Execute with the new connetion
resp, err := session.connection.executeJson(session.sessionID, stmt)
if err != nil {
return nil, err
}
return resp, nil
} else { // No need to reconnect
session.log.Error(fmt.Sprintf("Error info: %s", err2.Error()))
return nil, err2
}
}
func (session *Session) reConnect() error {
newconnection, err := session.connPool.getIdleConn()
if err != nil {
err = fmt.Errorf(err.Error())
return err
}
// Release connection to pool
session.connPool.release(session.connection)
session.connection = newconnection
return nil
}
// Release logs out and releases connetion hold by session.
// The connection will be added into the activeConnectionQueue of the connection pool
// so that it could be reused.
func (session *Session) Release() {
if session == nil {
return
}
if session.connection == nil {
session.log.Warn("Session has been released")
return
}
if err := session.connection.signOut(session.sessionID); err != nil {
session.log.Warn(fmt.Sprintf("Sign out failed, %s", err.Error()))
}
// Release connection to pool
session.connPool.release(session.connection)
session.connection = nil
}
func IsError(resp *graph.ExecutionResponse) bool {
return resp.GetErrorCode() != nebula.ErrorCode_SUCCEEDED
}