/
syncclient.go
220 lines (179 loc) · 5.7 KB
/
syncclient.go
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package gocbcore
import (
"encoding/binary"
"fmt"
"strings"
"time"
)
type memdSenderClient interface {
SupportsFeature(HelloFeature) bool
Address() string
SendRequest(*memdQRequest) error
}
type memdPipelineSenderWrap struct {
pipeline *memdPipeline
}
func (wrap *memdPipelineSenderWrap) SupportsFeature(feature HelloFeature) bool {
return false
}
func (wrap *memdPipelineSenderWrap) Address() string {
return wrap.pipeline.Address()
}
func (wrap *memdPipelineSenderWrap) SendRequest(req *memdQRequest) error {
return wrap.pipeline.SendRequest(req)
}
type syncClient struct {
client memdSenderClient
}
func (client *syncClient) SupportsFeature(feature HelloFeature) bool {
return client.client.SupportsFeature(feature)
}
func (client *syncClient) Address() string {
return client.client.Address()
}
func (client *syncClient) doRequest(req *memdPacket, deadline time.Time) (respOut *memdPacket, errOut error) {
signal := make(chan bool)
qreq := memdQRequest{
memdPacket: *req,
Callback: func(resp *memdQResponse, _ *memdQRequest, err error) {
if resp != nil {
respOut = &resp.memdPacket
}
errOut = err
signal <- true
},
}
err := client.client.SendRequest(&qreq)
if err != nil {
return nil, err
}
timeoutTmr := AcquireTimer(deadline.Sub(time.Now()))
select {
case <-signal:
ReleaseTimer(timeoutTmr, false)
return
case <-timeoutTmr.C:
ReleaseTimer(timeoutTmr, true)
if !qreq.Cancel() {
<-signal
return
}
return nil, ErrTimeout
}
}
func (client *syncClient) doBasicOp(cmd commandCode, k, v, e []byte, deadline time.Time) ([]byte, error) {
resp, err := client.doRequest(&memdPacket{
Magic: reqMagic,
Opcode: cmd,
Key: k,
Value: v,
Extras: e,
}, deadline)
// We do it this way as the response value could still be useful even if an
// error status code is returned. For instance, StatusAuthContinue still
// contains authentication stepping information.
if resp == nil {
return nil, err
}
return resp.Value, err
}
func (client *syncClient) ExecDcpControl(key string, value string, deadline time.Time) error {
_, err := client.doBasicOp(cmdDcpControl, []byte(key), []byte(value), nil, deadline)
return err
}
func (client *syncClient) ExecHello(clientId string, features []HelloFeature, deadline time.Time) ([]HelloFeature, error) {
appendFeatureCode := func(bytes []byte, feature HelloFeature) []byte {
bytes = append(bytes, 0, 0)
binary.BigEndian.PutUint16(bytes[len(bytes)-2:], uint16(feature))
return bytes
}
var featureBytes []byte
for _, feature := range features {
featureBytes = appendFeatureCode(featureBytes, feature)
}
bytes, err := client.doBasicOp(cmdHello, []byte(clientId), featureBytes, nil, deadline)
var srvFeatures []HelloFeature
for i := 0; i < len(bytes); i += 2 {
feature := binary.BigEndian.Uint16(bytes[i:])
srvFeatures = append(srvFeatures, HelloFeature(feature))
}
return srvFeatures, err
}
func (client *syncClient) ExecCccpRequest(deadline time.Time) ([]byte, error) {
return client.doBasicOp(cmdGetClusterConfig, nil, nil, nil, deadline)
}
func (client *syncClient) ExecGetErrorMap(version uint16, deadline time.Time) ([]byte, error) {
valueBuf := make([]byte, 2)
binary.BigEndian.PutUint16(valueBuf, version)
return client.doBasicOp(cmdGetErrorMap, nil, valueBuf, nil, deadline)
}
func (client *syncClient) ExecOpenDcpConsumer(streamName string, openFlags DcpOpenFlag, deadline time.Time) error {
_, ok := client.client.(*memdClient)
if !ok {
return ErrCliInternalError
}
extraBuf := make([]byte, 8)
binary.BigEndian.PutUint32(extraBuf[0:], 0)
binary.BigEndian.PutUint32(extraBuf[4:], uint32((openFlags & ^DcpOpenFlag(3))|DcpOpenFlagProducer))
_, err := client.doBasicOp(cmdDcpOpenConnection, []byte(streamName), nil, extraBuf, deadline)
return err
}
func (client *syncClient) ExecEnableDcpNoop(period time.Duration, deadline time.Time) error {
_, ok := client.client.(*memdClient)
if !ok {
return ErrCliInternalError
}
// The client will always reply to No-Op's. No need to enable it
err := client.ExecDcpControl("enable_noop", "true", deadline)
if err != nil {
return err
}
periodStr := fmt.Sprintf("%d", period/time.Second)
err = client.ExecDcpControl("set_noop_interval", periodStr, deadline)
if err != nil {
return err
}
return nil
}
func (client *syncClient) ExecEnableDcpClientEnd(deadline time.Time) error {
memcli, ok := client.client.(*memdClient)
if !ok {
return ErrCliInternalError
}
err := client.ExecDcpControl("send_stream_end_on_client_close_stream", "true", deadline)
if err != nil {
memcli.streamEndNotSupported = true
}
return nil
}
func (client *syncClient) ExecEnableDcpBufferAck(bufferSize int, deadline time.Time) error {
mclient, ok := client.client.(*memdClient)
if !ok {
return ErrCliInternalError
}
// Enable buffer acknowledgment on the client
mclient.EnableDcpBufferAck(bufferSize / 2)
bufferSizeStr := fmt.Sprintf("%d", bufferSize)
err := client.ExecDcpControl("connection_buffer_size", bufferSizeStr, deadline)
if err != nil {
return err
}
return nil
}
func (client *syncClient) ExecSaslListMechs(deadline time.Time) ([]string, error) {
bytes, err := client.doBasicOp(cmdSASLListMechs, nil, nil, nil, deadline)
if err != nil {
return nil, err
}
return strings.Split(string(bytes), " "), nil
}
func (client *syncClient) ExecSaslAuth(k, v []byte, deadline time.Time) ([]byte, error) {
return client.doBasicOp(cmdSASLAuth, k, v, nil, deadline)
}
func (client *syncClient) ExecSaslStep(k, v []byte, deadline time.Time) ([]byte, error) {
return client.doBasicOp(cmdSASLStep, k, v, nil, deadline)
}
func (client *syncClient) ExecSelectBucket(b []byte, deadline time.Time) error {
_, err := client.doBasicOp(cmdSelectBucket, b, nil, nil, deadline)
return err
}