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multi_command.go
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multi_command.go
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// Copyright 2013-2019 Aerospike, Inc.
//
// 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 aerospike
import (
"fmt"
"reflect"
"time"
. "github.com/aerospike/aerospike-client-go/types"
xrand "github.com/aerospike/aerospike-client-go/types/rand"
Buffer "github.com/aerospike/aerospike-client-go/utils/buffer"
)
type baseMultiCommand struct {
baseCommand
namespace string
clusterKey int64
first bool
terminationError ResultCode
recordset *Recordset
terminationErrorType ResultCode
errChan chan error
socketTimeout time.Duration
resObjType reflect.Type
resObjMappings map[string]string
selectCases []reflect.SelectCase
bc bufferedConn
}
var multiObjectParser func(
cmd *baseMultiCommand,
obj reflect.Value,
opCount int,
fieldCount int,
generation uint32,
expiration uint32,
) error
var prepareReflectionData func(cmd *baseMultiCommand)
func newMultiCommand(node *Node, recordset *Recordset) *baseMultiCommand {
cmd := &baseMultiCommand{
baseCommand: baseCommand{
node: node,
oneShot: true,
},
recordset: recordset,
}
if prepareReflectionData != nil {
prepareReflectionData(cmd)
}
return cmd
}
func newCorrectMultiCommand(node *Node, recordset *Recordset, namespace string, clusterKey int64, first bool) *baseMultiCommand {
cmd := &baseMultiCommand{
baseCommand: baseCommand{
node: node,
oneShot: true,
},
namespace: namespace,
clusterKey: clusterKey,
first: first,
recordset: recordset,
}
if prepareReflectionData != nil {
prepareReflectionData(cmd)
}
return cmd
}
func (cmd *baseMultiCommand) getNode(ifc command) (*Node, error) {
return cmd.node, nil
}
func (cmd *baseMultiCommand) getConnection(policy Policy) (*Connection, error) {
return cmd.node.getConnectionWithHint(policy.GetBasePolicy().deadline(), policy.GetBasePolicy().socketTimeout(), byte(xrand.Int64()%256))
}
func (cmd *baseMultiCommand) putConnection(conn *Connection) {
cmd.node.putConnectionWithHint(conn, byte(xrand.Int64()%256))
}
func (cmd *baseMultiCommand) parseResult(ifc command, conn *Connection) error {
// Read socket into receive buffer one record at a time. Do not read entire receive size
// because the receive buffer would be too big.
status := true
var err error
cmd.bc = newBufferedConn(conn, 0)
for status {
cmd.bc.reset(8)
// Read header.
if cmd.dataBuffer, err = cmd.bc.read(8); err != nil {
return err
}
size := Buffer.BytesToInt64(cmd.dataBuffer, 0)
// Validate header to make sure we are at the beginning of a message
if err := cmd.validateHeader(size); err != nil {
return err
}
receiveSize := int(size & 0xFFFFFFFFFFFF)
if receiveSize > 0 {
cmd.bc.reset(receiveSize)
status, err = ifc.parseRecordResults(ifc, receiveSize)
if err != nil {
cmd.bc.drainConn()
return err
}
} else {
status = false
}
}
// if the buffer has been resized, put it back so that it will be reassigned to the connection.
cmd.dataBuffer = cmd.bc.buf()
return nil
}
func (cmd *baseMultiCommand) parseKey(fieldCount int) (*Key, error) {
var digest [20]byte
var namespace, setName string
var userKey Value
var err error
for i := 0; i < fieldCount; i++ {
if err = cmd.readBytes(4); err != nil {
return nil, err
}
fieldlen := int(Buffer.BytesToUint32(cmd.dataBuffer, 0))
if err = cmd.readBytes(fieldlen); err != nil {
return nil, err
}
fieldtype := FieldType(cmd.dataBuffer[0])
size := fieldlen - 1
switch fieldtype {
case DIGEST_RIPE:
copy(digest[:], cmd.dataBuffer[1:size+1])
case NAMESPACE:
namespace = string(cmd.dataBuffer[1 : size+1])
case TABLE:
setName = string(cmd.dataBuffer[1 : size+1])
case KEY:
if userKey, err = bytesToKeyValue(int(cmd.dataBuffer[1]), cmd.dataBuffer, 2, size-1); err != nil {
return nil, err
}
}
}
return &Key{namespace: namespace, setName: setName, digest: digest, userKey: userKey}, nil
}
func (cmd *baseMultiCommand) readBytes(length int) (err error) {
// Corrupted data streams can result in a huge length.
// Do a sanity check here.
if length > MaxBufferSize || length < 0 {
return NewAerospikeError(PARSE_ERROR, fmt.Sprintf("Invalid readBytes length: %d", length))
}
cmd.dataBuffer, err = cmd.bc.read(length)
if err != nil {
return err
}
cmd.dataOffset += length
return nil
}
func (cmd *baseMultiCommand) parseRecordResults(ifc command, receiveSize int) (bool, error) {
// Read/parse remaining message bytes one record at a time.
cmd.dataOffset = 0
for cmd.dataOffset < receiveSize {
if err := cmd.readBytes(int(_MSG_REMAINING_HEADER_SIZE)); err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
resultCode := ResultCode(cmd.dataBuffer[5] & 0xFF)
if resultCode != 0 {
if resultCode == KEY_NOT_FOUND_ERROR || resultCode == FILTERED_OUT {
return false, nil
}
err := NewAerospikeError(resultCode)
err = newNodeError(cmd.node, err)
return false, err
}
info3 := int(cmd.dataBuffer[3])
// If cmd is the end marker of the response, do not proceed further
if (info3 & _INFO3_LAST) == _INFO3_LAST {
return false, nil
}
generation := Buffer.BytesToUint32(cmd.dataBuffer, 6)
expiration := TTL(Buffer.BytesToUint32(cmd.dataBuffer, 10))
fieldCount := int(Buffer.BytesToUint16(cmd.dataBuffer, 18))
opCount := int(Buffer.BytesToUint16(cmd.dataBuffer, 20))
key, err := cmd.parseKey(fieldCount)
if err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
// if there is a recordset, process the record traditionally
// otherwise, it is supposed to be a record channel
if cmd.selectCases == nil {
// Parse bins.
var bins BinMap
for i := 0; i < opCount; i++ {
if err := cmd.readBytes(8); err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
opSize := int(Buffer.BytesToUint32(cmd.dataBuffer, 0))
particleType := int(cmd.dataBuffer[5])
nameSize := int(cmd.dataBuffer[7])
if err := cmd.readBytes(nameSize); err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
name := string(cmd.dataBuffer[:nameSize])
particleBytesSize := opSize - (4 + nameSize)
if err = cmd.readBytes(particleBytesSize); err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
value, err := bytesToParticle(particleType, cmd.dataBuffer, 0, particleBytesSize)
if err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
if bins == nil {
bins = make(BinMap, opCount)
}
bins[name] = value
}
// If the channel is full and it blocks, we don't want this command to
// block forever, or panic in case the channel is closed in the meantime.
select {
// send back the result on the async channel
case cmd.recordset.Records <- newRecord(cmd.node, key, bins, generation, expiration):
case <-cmd.recordset.cancelled:
return false, NewAerospikeError(cmd.terminationErrorType)
}
} else if multiObjectParser != nil {
obj := reflect.New(cmd.resObjType)
if err := multiObjectParser(cmd, obj, opCount, fieldCount, generation, expiration); err != nil {
err = newNodeError(cmd.node, err)
return false, err
}
// set the object to send
cmd.selectCases[0].Send = obj
chosen, _, _ := reflect.Select(cmd.selectCases)
switch chosen {
case 0: // object sent
case 1: // cancel channel is closed
return false, NewAerospikeError(cmd.terminationErrorType)
}
}
}
return true, nil
}
func (cmd *baseMultiCommand) execute(ifc command, isRead bool) error {
/***************************************************************************
IMPORTANT: No need to send the error here to the recordset.Error channel.
It is being sent from the downstream command from the result
returned from the function.
****************************************************************************/
if cmd.clusterKey != 0 {
if !cmd.first {
if err := queryValidate(cmd.node, cmd.namespace, cmd.clusterKey); err != nil {
return err
}
}
if err := cmd.baseCommand.execute(ifc, isRead); err != nil {
return err
}
return queryValidate(cmd.node, cmd.namespace, cmd.clusterKey)
}
return cmd.baseCommand.execute(ifc, isRead)
}