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agentops.go
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agentops.go
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package gocbcore
import (
"encoding/json"
"sync/atomic"
"time"
)
// Cas represents a unique revision of a document. This can be used
// to perform optimistic locking.
type Cas uint64
// VbUuid represents a unique identifier for a particular vbucket history.
type VbUuid uint64
// SeqNo is a sequential mutation number indicating the order and precise
// position of a write that has occurred.
type SeqNo uint64
// MutationToken represents a particular mutation within the cluster.
type MutationToken struct {
VbId uint16
VbUuid VbUuid
SeqNo SeqNo
}
// PendingOp represents an outstanding operation within the client.
// This can be used to cancel an operation before it completes.
type PendingOp interface {
Cancel() bool
}
type multiPendingOp struct {
ops []PendingOp
completedOps uint32
}
func (mp *multiPendingOp) Cancel() bool {
var failedCancels uint32
for _, op := range mp.ops {
if !op.Cancel() {
failedCancels++
}
}
return mp.CompletedOps()-failedCancels == 0
}
func (mp *multiPendingOp) CompletedOps() uint32 {
return atomic.LoadUint32(&mp.completedOps)
}
func (mp *multiPendingOp) IncrementCompletedOps() uint32 {
return atomic.AddUint32(&mp.completedOps, 1)
}
func (agent *Agent) waitAndRetryOperation(req *memdQRequest, waitDura time.Duration) {
if waitDura == 0 {
agent.requeueDirect(req)
} else {
time.AfterFunc(waitDura, func() {
agent.requeueDirect(req)
})
}
}
func (agent *Agent) waitAndRetryNmv(req *memdQRequest) {
agent.waitAndRetryOperation(req, agent.nmvRetryDelay)
}
func (agent *Agent) handleOpNmv(resp *memdQResponse, req *memdQRequest) {
// Grab just the hostname from the source address
sourceHost, err := hostFromHostPort(resp.sourceAddr)
if err != nil {
logErrorf("NMV response source address was invalid, skipping config update")
agent.waitAndRetryNmv(req)
return
}
// Try to parse the value as a bucket configuration
bk, err := parseConfig(resp.Value, sourceHost)
if err == nil {
agent.updateConfig(bk)
}
// Redirect it! This may actually come back to this server, but I won't tell
// if you don't ;)
agent.waitAndRetryNmv(req)
}
func (agent *Agent) getKvErrMapData(code StatusCode) *kvErrorMapError {
if agent.useKvErrorMaps {
errMap := agent.kvErrorMap.Get()
if errMap != nil {
if errData, ok := errMap.Errors[uint16(code)]; ok {
return &errData
}
}
}
return nil
}
func (agent *Agent) makeMemdError(code StatusCode, errMapData *kvErrorMapError, ehData []byte) error {
if code == StatusSuccess {
return nil
}
if agent.useEnhancedErrors {
var err *KvError
if errMapData != nil {
err = &KvError{
Code: code,
Name: errMapData.Name,
Description: errMapData.Description,
}
} else {
err = newSimpleError(code)
}
if ehData != nil {
var enhancedData struct {
Error struct {
Context string `json:"context"`
Ref string `json:"ref"`
} `json:"error"`
}
if parseErr := json.Unmarshal(ehData, &enhancedData); parseErr == nil {
err.Context = enhancedData.Error.Context
err.Ref = enhancedData.Error.Ref
}
}
return err
}
if ok, err := findMemdError(code); ok {
return err
}
if errMapData != nil {
return KvError{
Code: code,
Name: errMapData.Name,
Description: errMapData.Description,
}
}
return newSimpleError(code)
}
func (agent *Agent) makeBasicMemdError(code StatusCode) error {
if !agent.useKvErrorMaps {
return agent.makeMemdError(code, nil, nil)
}
errMapData := agent.getKvErrMapData(code)
return agent.makeMemdError(code, errMapData, nil)
}
func (agent *Agent) handleOpRoutingResp(resp *memdQResponse, req *memdQRequest, err error) (bool, error) {
if resp.Magic == resMagic {
// Temporary backwards compatibility handling...
if resp.Status == StatusLocked {
switch req.Opcode {
case cmdSet:
resp.Status = StatusKeyExists
case cmdReplace:
resp.Status = StatusKeyExists
case cmdDelete:
resp.Status = StatusKeyExists
default:
resp.Status = StatusTmpFail
}
}
if resp.Status == StatusNotMyVBucket {
agent.handleOpNmv(resp, req)
return true, nil
} else if resp.Status == StatusSuccess {
return false, nil
}
kvErrData := agent.getKvErrMapData(resp.Status)
if kvErrData != nil {
for _, attr := range kvErrData.Attributes {
if attr == "auto-retry" {
retryWait := kvErrData.Retry.CalculateRetryDelay(req.retryCount)
maxDura := time.Duration(kvErrData.Retry.MaxDuration) * time.Millisecond
if time.Now().Sub(req.dispatchTime)+retryWait > maxDura {
break
}
req.retryCount++
agent.waitAndRetryOperation(req, retryWait)
return true, nil
}
}
}
if DatatypeFlag(resp.Datatype)&DatatypeFlagJson != 0 {
err = agent.makeMemdError(resp.Status, kvErrData, resp.Value)
if !IsErrorStatus(err, StatusSuccess) &&
!IsErrorStatus(err, StatusKeyNotFound) &&
!IsErrorStatus(err, StatusKeyExists) {
logDebugf("detailed error: %+v", err)
}
} else {
err = agent.makeMemdError(resp.Status, kvErrData, nil)
}
}
return false, err
}
func (agent *Agent) dispatchOp(req *memdQRequest) (PendingOp, error) {
req.owner = agent
req.dispatchTime = time.Now()
err := agent.dispatchDirect(req)
if err != nil {
return nil, err
}
return req, nil
}
func (agent *Agent) dispatchOpToAddress(req *memdQRequest, address string) (PendingOp, error) {
req.owner = agent
req.dispatchTime = time.Now()
err := agent.dispatchDirectToAddress(req, address)
if err != nil {
return req, nil
}
return req, nil
}