/
retry.go
343 lines (275 loc) · 12 KB
/
retry.go
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package gocb
import (
"context"
"errors"
"time"
"google.golang.org/grpc"
"github.com/google/uuid"
"github.com/couchbase/gocbcore/v10"
)
// RetryRequest is a request that can possibly be retried.
type RetryRequest interface {
RetryAttempts() uint32
Identifier() string
Idempotent() bool
RetryReasons() []RetryReason
}
// RetryReason represents the reason for an operation possibly being retried.
type RetryReason interface {
AllowsNonIdempotentRetry() bool
AlwaysRetry() bool
Description() string
}
var (
// UnknownRetryReason indicates that the operation failed for an unknown reason.
UnknownRetryReason = RetryReason(gocbcore.UnknownRetryReason)
// SocketNotAvailableRetryReason indicates that the operation failed because the underlying socket was not available.
SocketNotAvailableRetryReason = RetryReason(gocbcore.SocketNotAvailableRetryReason)
// ServiceNotAvailableRetryReason indicates that the operation failed because the requested service was not available.
ServiceNotAvailableRetryReason = RetryReason(gocbcore.ServiceNotAvailableRetryReason)
// NodeNotAvailableRetryReason indicates that the operation failed because the requested node was not available.
NodeNotAvailableRetryReason = RetryReason(gocbcore.NodeNotAvailableRetryReason)
// KVNotMyVBucketRetryReason indicates that the operation failed because it was sent to the wrong node for the vbucket.
KVNotMyVBucketRetryReason = RetryReason(gocbcore.KVNotMyVBucketRetryReason)
// KVCollectionOutdatedRetryReason indicates that the operation failed because the collection ID on the request is outdated.
KVCollectionOutdatedRetryReason = RetryReason(gocbcore.KVCollectionOutdatedRetryReason)
// KVErrMapRetryReason indicates that the operation failed for an unsupported reason but the KV error map indicated
// that the operation can be retried.
KVErrMapRetryReason = RetryReason(gocbcore.KVErrMapRetryReason)
// KVLockedRetryReason indicates that the operation failed because the document was locked.
KVLockedRetryReason = RetryReason(gocbcore.KVLockedRetryReason)
// KVTemporaryFailureRetryReason indicates that the operation failed because of a temporary failure.
KVTemporaryFailureRetryReason = RetryReason(gocbcore.KVTemporaryFailureRetryReason)
// KVSyncWriteInProgressRetryReason indicates that the operation failed because a sync write is in progress.
KVSyncWriteInProgressRetryReason = RetryReason(gocbcore.KVSyncWriteInProgressRetryReason)
// KVSyncWriteRecommitInProgressRetryReason indicates that the operation failed because a sync write recommit is in progress.
KVSyncWriteRecommitInProgressRetryReason = RetryReason(gocbcore.KVSyncWriteRecommitInProgressRetryReason)
// ServiceResponseCodeIndicatedRetryReason indicates that the operation failed and the service responded stating that
// the request should be retried.
ServiceResponseCodeIndicatedRetryReason = RetryReason(gocbcore.ServiceResponseCodeIndicatedRetryReason)
// SocketCloseInFlightRetryReason indicates that the operation failed because the socket was closed whilst the operation
// was in flight.
SocketCloseInFlightRetryReason = RetryReason(gocbcore.SocketCloseInFlightRetryReason)
// CircuitBreakerOpenRetryReason indicates that the operation failed because the circuit breaker on the connection
// was open.
CircuitBreakerOpenRetryReason = RetryReason(gocbcore.CircuitBreakerOpenRetryReason)
// QueryIndexNotFoundRetryReason indicates that the operation failed to to a missing query index
QueryIndexNotFoundRetryReason = RetryReason(gocbcore.QueryIndexNotFoundRetryReason)
// QueryPreparedStatementFailureRetryReason indicates that the operation failed due to a prepared statement failure
QueryPreparedStatementFailureRetryReason = RetryReason(gocbcore.QueryPreparedStatementFailureRetryReason)
// AnalyticsTemporaryFailureRetryReason indicates that an analytics operation failed due to a temporary failure
AnalyticsTemporaryFailureRetryReason = RetryReason(gocbcore.AnalyticsTemporaryFailureRetryReason)
// SearchTooManyRequestsRetryReason indicates that a search operation failed due to too many requests
SearchTooManyRequestsRetryReason = RetryReason(gocbcore.SearchTooManyRequestsRetryReason)
// QueryErrorRetryable indicates that the operation is retryable as indicated by the query engine.
// Uncommitted: This API may change in the future.
QueryErrorRetryable = RetryReason(gocbcore.QueryErrorRetryable)
// NotReadyRetryReason indicates the SDK connections are not setup and ready to be used.
NotReadyRetryReason = RetryReason(gocbcore.NotReadyRetryReason)
)
// RetryAction is used by a RetryStrategy to calculate the duration to wait before retrying an operation.
// Returning a value of 0 indicates to not retry.
type RetryAction interface {
Duration() time.Duration
}
// NoRetryRetryAction represents an action that indicates to not retry.
type NoRetryRetryAction struct {
}
// Duration is the length of time to wait before retrying an operation.
func (ra *NoRetryRetryAction) Duration() time.Duration {
return 0
}
// WithDurationRetryAction represents an action that indicates to retry with a given duration.
type WithDurationRetryAction struct {
WithDuration time.Duration
}
// Duration is the length of time to wait before retrying an operation.
func (ra *WithDurationRetryAction) Duration() time.Duration {
return ra.WithDuration
}
// RetryStrategy is to determine if an operation should be retried, and if so how long to wait before retrying.
type RetryStrategy interface {
RetryAfter(req RetryRequest, reason RetryReason) RetryAction
}
// BackoffCalculator defines how backoff durations will be calculated by the retry API.
type BackoffCalculator func(retryAttempts uint32) time.Duration
// BestEffortRetryStrategy represents a strategy that will keep retrying until it succeeds (or the caller times out
// the request).
type BestEffortRetryStrategy struct {
BackoffCalculator BackoffCalculator
}
// NewBestEffortRetryStrategy returns a new BestEffortRetryStrategy which will use the supplied calculator function
// to calculate retry durations. If calculator is nil then a controlled backoff will be used.
func NewBestEffortRetryStrategy(calculator BackoffCalculator) *BestEffortRetryStrategy {
if calculator == nil {
calculator = BackoffCalculator(gocbcore.ExponentialBackoff(1*time.Millisecond, 500*time.Millisecond, 2))
}
return &BestEffortRetryStrategy{BackoffCalculator: calculator}
}
// RetryAfter calculates and returns a RetryAction describing how long to wait before retrying an operation.
func (rs *BestEffortRetryStrategy) RetryAfter(req RetryRequest, reason RetryReason) RetryAction {
if req.Idempotent() || reason.AllowsNonIdempotentRetry() {
return &WithDurationRetryAction{WithDuration: rs.BackoffCalculator(req.RetryAttempts())}
}
return &NoRetryRetryAction{}
}
type internalRetryRequest interface {
RetryAttempts() uint32
Identifier() string
Idempotent() bool
RetryReasons() []RetryReason
retryStrategy() RetryStrategy
recordRetryAttempt(reason RetryReason)
}
// retryOrchMaybeRetry will possibly retry an operation according to the strategy belonging to the request.
// It will use the reason to determine whether or not the failure reason is one that can be retried.
func retryOrchMaybeRetry(req internalRetryRequest, reason RetryReason) (bool, time.Time) {
if reason.AlwaysRetry() {
duration := gocbcore.ControlledBackoff(req.RetryAttempts())
logDebugf("Will retry request. Backoff=%s, OperationID=%s. Reason=%s", duration, req.Identifier(), reason)
req.recordRetryAttempt(reason)
return true, time.Now().Add(duration)
}
retryStrategy := req.retryStrategy()
if retryStrategy == nil {
return false, time.Time{}
}
action := retryStrategy.RetryAfter(req, reason)
if action == nil {
logDebugf("Won't retry request. OperationID=%s. Reason=%s", req.Identifier(), reason)
return false, time.Time{}
}
duration := action.Duration()
if duration == 0 {
logDebugf("Won't retry request. OperationID=%s. Reason=%s", req.Identifier(), reason)
return false, time.Time{}
}
logDebugf("Will retry request. Backoff=%s, OperationID=%s. Reason=%s", duration, req.Identifier(), reason)
req.recordRetryAttempt(reason)
return true, time.Now().Add(duration)
}
type retriedRequestInfo interface {
Operation() string
Identifier() string
RetryAttempts() uint32
RetryReasons() []RetryReason
}
type retriableRequestPs struct {
// reasons is effectively a set, so we can't just use len(reasons) for num attempts.
reasons []RetryReason
attempts uint32
operation string
traceIdentifier string
loggerIdentifier string
idempotent bool
strategy RetryStrategy
rootTraceContext RequestSpanContext
}
func newRetriableRequestPS(operation string, idempotent bool, rootContext RequestSpanContext, traceIdentifier string,
strategy RetryStrategy) *retriableRequestPs {
loggerIdentifier := traceIdentifier
if loggerIdentifier == "" {
loggerIdentifier = uuid.NewString()[:6]
}
return &retriableRequestPs{
operation: operation,
traceIdentifier: traceIdentifier,
loggerIdentifier: loggerIdentifier,
idempotent: idempotent,
rootTraceContext: rootContext,
strategy: strategy,
}
}
func (w *retriableRequestPs) RetryAttempts() uint32 {
return w.attempts
}
func (w *retriableRequestPs) Identifier() string {
return w.loggerIdentifier
}
func (w *retriableRequestPs) Idempotent() bool {
return w.idempotent
}
func (w *retriableRequestPs) RetryReasons() []RetryReason {
return w.reasons
}
func (w *retriableRequestPs) Operation() string {
return w.operation
}
func (w *retriableRequestPs) retryStrategy() RetryStrategy {
return w.strategy
}
func (w *retriableRequestPs) recordRetryAttempt(reason RetryReason) {
w.attempts++
found := false
for i := 0; i < len(w.reasons); i++ {
if w.reasons[i] == reason {
found = true
break
}
}
// if idx is out of the range of retryReasons then it wasn't found.
if !found {
w.reasons = append(w.reasons, reason)
}
}
func handleRetriableRequest[ReqT any, RespT any](
ctx context.Context, createdTime time.Time, tracer RequestTracer,
req ReqT,
retryReq *retriableRequestPs,
sendFn func(context.Context, ReqT, ...grpc.CallOption) (RespT, error),
retryReasonFn func(err error) RetryReason) (RespT, error) {
for {
logSchedf("Writing request ID=%s, OP=%s", retryReq.loggerIdentifier, retryReq.operation)
span := tracer.RequestSpan(retryReq.rootTraceContext, "dispatch_to_server")
span.SetAttribute(spanAttribDBSystemKey, spanAttribDBSystemValue)
span.SetAttribute(spanAttribNumRetries, retryReq.RetryAttempts())
span.SetAttribute(spanAttribNetTransport, "IP.TCP")
if retryReq.traceIdentifier != "" {
span.SetAttribute(spanAttribOperationIDKey, retryReq.traceIdentifier)
}
res, err := sendFn(ctx, req)
span.End()
logSchedf("Handling response ID=%s, OP=%s", retryReq.loggerIdentifier, retryReq.operation)
if err != nil {
gocbErr := mapPsErrorToGocbError(err, retryReq.Idempotent())
var emptyResp RespT
if errors.Is(gocbErr, ErrTimeout) {
return emptyResp, &TimeoutError{
InnerError: gocbErr,
OperationID: retryReq.Operation(),
Opaque: retryReq.Identifier(),
TimeObserved: time.Since(createdTime),
RetryReasons: retryReq.RetryReasons(),
RetryAttempts: retryReq.RetryAttempts(),
}
}
retryReason := retryReasonFn(gocbErr)
if retryReason == nil {
return emptyResp, gocbErr
}
shouldRetry, retryWait := retryOrchMaybeRetry(retryReq, retryReason)
if !shouldRetry {
return emptyResp, gocbErr
}
select {
case <-time.After(time.Until(retryWait)):
continue
case <-ctx.Done():
err := ctx.Err()
if errors.Is(err, context.DeadlineExceeded) {
return emptyResp, &TimeoutError{
InnerError: ErrUnambiguousTimeout,
OperationID: retryReq.Operation(),
Opaque: retryReq.Identifier(),
TimeObserved: time.Since(createdTime),
RetryReasons: retryReq.RetryReasons(),
RetryAttempts: retryReq.RetryAttempts(),
}
} else {
return emptyResp, makeGenericError(ErrRequestCanceled, nil)
}
}
}
return res, nil
}
}