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session.go
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session.go
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/*
Copyright 2022 CodeNotary, Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package server
import (
"crypto/tls"
"encoding/json"
"github.com/codenotary/immudb/pkg/api/schema"
"github.com/codenotary/immudb/pkg/auth"
"github.com/codenotary/immudb/pkg/database"
"github.com/codenotary/immudb/pkg/logger"
"github.com/codenotary/immudb/pkg/pgsql/errors"
bm "github.com/codenotary/immudb/pkg/pgsql/server/bmessages"
fm "github.com/codenotary/immudb/pkg/pgsql/server/fmessages"
"github.com/codenotary/immudb/pkg/pgsql/server/pgmeta"
"net"
"sync"
)
type session struct {
tlsConfig *tls.Config
log logger.Logger
mr MessageReader
username string
database database.DB
sysDb database.DB
connParams map[string]string
protocolVersion string
portals map[string]*portal
statements map[string]*statement
sync.Mutex
}
type Session interface {
InitializeSession() error
HandleStartup(dbList database.DatabaseList) error
QueriesMachine() (err error)
ErrorHandle(err error)
}
func NewSession(c net.Conn, log logger.Logger, sysDb database.DB, tlsConfig *tls.Config) *session {
s := &session{
tlsConfig: tlsConfig,
log: log,
mr: NewMessageReader(c),
sysDb: sysDb,
portals: make(map[string]*portal),
statements: make(map[string]*statement),
}
return s
}
func (s *session) ErrorHandle(e error) {
if e != nil {
er := errors.MapPgError(e)
_, err := s.writeMessage(er.Encode())
if err != nil {
s.log.Errorf("unable to write error on wire: %v", err)
}
s.log.Debugf("%s", er.ToString())
if _, err := s.writeMessage(bm.ReadyForQuery()); err != nil {
s.log.Errorf("unable to complete error handling: %v", err)
}
}
}
func (s *session) nextMessage() (interface{}, bool, error) {
msg, err := s.mr.ReadRawMessage()
if err != nil {
return nil, false, err
}
s.log.Debugf("received %s - %s message", string(msg.t), pgmeta.MTypes[msg.t])
extQueryMode := false
i, err := s.parseRawMessage(msg)
if msg.t == 'P' ||
msg.t == 'B' ||
msg.t == 'D' ||
msg.t == 'E' ||
msg.t == 'H' {
extQueryMode = true
}
return i, extQueryMode, err
}
func (s *session) parseRawMessage(msg *rawMessage) (interface{}, error) {
switch msg.t {
case 'p':
return fm.ParsePasswordMsg(msg.payload)
case 'Q':
return fm.ParseQueryMsg(msg.payload)
case 'X':
return fm.ParseTerminateMsg(msg.payload)
case 'P':
return fm.ParseParseMsg(msg.payload)
case 'B':
return fm.ParseBindMsg(msg.payload)
case 'D':
return fm.ParseDescribeMsg(msg.payload)
case 'S':
return fm.ParseSyncMsg(msg.payload)
case 'E':
return fm.ParseExecuteMsg(msg.payload)
case 'H':
return fm.ParseFlushMsg(msg.payload)
default:
return nil, errors.ErrUnknowMessageType
}
}
func (s *session) writeMessage(msg []byte) (int, error) {
s.debugMessage(msg)
return s.mr.Write(msg)
}
func (s *session) debugMessage(msg []byte) {
if s.log != nil && len(msg) > 0 {
s.log.Debugf("write %s - %s message", string(msg[0]), pgmeta.MTypes[msg[0]])
}
}
func (s *session) getUser(username []byte) (*auth.User, error) {
key := make([]byte, 1+len(username))
// todo put KeyPrefixUser in a common package
key[0] = 1
copy(key[1:], username)
item, err := s.sysDb.Get(&schema.KeyRequest{Key: key})
if err != nil {
return nil, err
}
var usr auth.User
err = json.Unmarshal(item.Value, &usr)
if err != nil {
return nil, err
}
return &usr, nil
}