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kvopmanager.go
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/
kvopmanager.go
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package gocb
import (
"time"
gocbcore "github.com/couchbase/gocbcore/v8"
"github.com/pkg/errors"
)
type kvOpManager struct {
parent *Collection
signal chan struct{}
err error
wasResolved bool
mutationToken *MutationToken
span requestSpan
documentID string
transcoder Transcoder
timeout time.Duration
bytes []byte
flags uint32
persistTo uint
replicateTo uint
durabilityLevel DurabilityLevel
retryStrategy *retryStrategyWrapper
cancelCh chan struct{}
}
func (m *kvOpManager) getTimeout() time.Duration {
if m.timeout > 0 {
return m.timeout
}
defaultTimeout := m.parent.sb.KvTimeout
if m.durabilityLevel > DurabilityLevelMajority || m.persistTo > 0 {
defaultTimeout = m.parent.sb.KvDurableTimeout
}
return defaultTimeout
}
func (m *kvOpManager) SetDocumentID(id string) {
m.documentID = id
}
func (m *kvOpManager) SetCancelCh(cancelCh chan struct{}) {
m.cancelCh = cancelCh
}
func (m *kvOpManager) SetTimeout(timeout time.Duration) {
m.timeout = timeout
}
func (m *kvOpManager) SetTranscoder(transcoder Transcoder) {
if transcoder == nil {
transcoder = m.parent.sb.Transcoder
}
m.transcoder = transcoder
}
func (m *kvOpManager) SetValue(val interface{}) {
if m.err != nil {
return
}
if m.transcoder == nil {
m.err = errors.New("Expected a transcoder to be specified first")
return
}
espan := m.parent.startKvOpTrace("encode", m.span)
defer espan.Finish()
bytes, flags, err := m.transcoder.Encode(val)
if err != nil {
m.err = err
return
}
m.bytes = bytes
m.flags = flags
}
func (m *kvOpManager) SetDuraOptions(persistTo, replicateTo uint, level DurabilityLevel) {
if persistTo != 0 || replicateTo != 0 {
if !m.parent.sb.UseMutationTokens {
m.err = makeInvalidArgumentsError("cannot use observe based durability without mutation tokens")
return
}
if level > 0 {
m.err = makeInvalidArgumentsError("cannot mix observe based durability and synchronous durability")
return
}
}
m.persistTo = persistTo
m.replicateTo = replicateTo
m.durabilityLevel = level
}
func (m *kvOpManager) SetRetryStrategy(retryStrategy RetryStrategy) {
wrapper := m.parent.sb.RetryStrategyWrapper
if retryStrategy != nil {
wrapper = newRetryStrategyWrapper(retryStrategy)
}
m.retryStrategy = wrapper
}
func (m *kvOpManager) Finish() {
m.span.Finish()
}
func (m *kvOpManager) TraceSpan() requestSpan {
return m.span
}
func (m *kvOpManager) DocumentID() []byte {
return []byte(m.documentID)
}
func (m *kvOpManager) CollectionName() string {
return m.parent.name()
}
func (m *kvOpManager) ScopeName() string {
return m.parent.scopeName()
}
func (m *kvOpManager) BucketName() string {
return m.parent.sb.BucketName
}
func (m *kvOpManager) ValueBytes() []byte {
return m.bytes
}
func (m *kvOpManager) ValueFlags() uint32 {
return m.flags
}
func (m *kvOpManager) Transcoder() Transcoder {
return m.transcoder
}
func (m *kvOpManager) DurabilityLevel() gocbcore.DurabilityLevel {
return gocbcore.DurabilityLevel(m.durabilityLevel)
}
func (m *kvOpManager) DurabilityTimeout() uint16 {
timeout := m.getTimeout()
duraTimeout := timeout * 10 / 9
return uint16(duraTimeout / time.Millisecond)
}
func (m *kvOpManager) RetryStrategy() *retryStrategyWrapper {
return m.retryStrategy
}
func (m *kvOpManager) CheckReadyForOp() error {
if m.err != nil {
return m.err
}
if m.getTimeout() == 0 {
return errors.New("op manager had no timeout specified")
}
return nil
}
func (m *kvOpManager) NeedsObserve() bool {
return m.persistTo > 0 || m.replicateTo > 0
}
func (m *kvOpManager) EnhanceErr(err error) error {
return maybeEnhanceCollKVErr(err, nil, m.parent, m.documentID)
}
func (m *kvOpManager) EnhanceMt(token gocbcore.MutationToken) *MutationToken {
if token.VbUUID != 0 {
return &MutationToken{
token: token,
bucketName: m.BucketName(),
}
}
return nil
}
func (m *kvOpManager) Reject() {
m.signal <- struct{}{}
}
func (m *kvOpManager) Resolve(token *MutationToken) {
m.wasResolved = true
m.mutationToken = token
m.signal <- struct{}{}
}
func (m *kvOpManager) Wait(op gocbcore.PendingOp, err error) error {
if err != nil {
return err
}
if m.err != nil {
op.Cancel(errors.New("performed operation with invalid data"))
}
// We do this to allow operations with no deadline to still proceed
// without immediately timing out due to bad math on the sub time below.
waitTimeout := m.getTimeout()
waitDeadline := time.Now().Add(waitTimeout)
select {
case <-m.signal:
// Good to go
case <-m.cancelCh:
op.Cancel(ErrRequestCanceled)
<-m.signal
case <-time.After(waitDeadline.Sub(time.Now())):
// Ran out of time...
op.Cancel(ErrAmbiguousTimeout)
<-m.signal
}
if m.wasResolved && (m.persistTo > 0 || m.replicateTo > 0) {
if m.mutationToken == nil {
return errors.New("expected a mutation token")
}
return m.parent.waitForDurability(
m.span,
m.documentID,
m.mutationToken.token,
m.replicateTo,
m.persistTo,
waitDeadline,
m.cancelCh,
)
}
return nil
}
func (c *Collection) newKvOpManager(opName string, tracectx requestSpanContext) *kvOpManager {
span := c.startKvOpTrace(opName, tracectx)
return &kvOpManager{
parent: c,
signal: make(chan struct{}, 1),
span: span,
}
}
func durationToExpiry(dura time.Duration) uint32 {
// If the duration is 0, that indicates never-expires
if dura == 0 {
return 0
}
// If the duration is less than one second, we must force the
// value to 1 to avoid accidentally making it never expire.
if dura < 1*time.Second {
return 1
}
// Translate into a uint32 in seconds.
return uint32(dura / time.Second)
}