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// Copyright (C) MongoDB, Inc. 2022-present.
//
// 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
package csot
import (
"context"
"time"
)
type timeoutKey struct{}
// MakeTimeoutContext returns a new context with Client-Side Operation Timeout (CSOT) feature-gated behavior
// and a Timeout set to the passed in Duration. Setting a Timeout on a single operation is not supported in
// public API.
//
// TODO(GODRIVER-2348) We may be able to remove this function once CSOT feature-gated behavior becomes the
// TODO default behavior.
func MakeTimeoutContext(ctx context.Context, to time.Duration) (context.Context, context.CancelFunc) {
// Only use the passed in Duration as a timeout on the Context if it
// is non-zero.
cancelFunc := func() {}
if to != 0 {
ctx, cancelFunc = context.WithTimeout(ctx, to)
}
return context.WithValue(ctx, timeoutKey{}, true), cancelFunc
}
func IsTimeoutContext(ctx context.Context) bool {
return ctx.Value(timeoutKey{}) != nil
}
// ZeroRTTMonitor implements the RTTMonitor interface and is used internally for testing. It returns 0 for all
// RTT calculations and an empty string for RTT statistics.
type ZeroRTTMonitor struct{}
// EWMA implements the RTT monitor interface.
func (zrm *ZeroRTTMonitor) EWMA() time.Duration {
return 0
}
// Min implements the RTT monitor interface.
func (zrm *ZeroRTTMonitor) Min() time.Duration {
return 0
}
// P90 implements the RTT monitor interface.
func (zrm *ZeroRTTMonitor) P90() time.Duration {
return 0
}
// Stats implements the RTT monitor interface.
func (zrm *ZeroRTTMonitor) Stats() string {
return ""
}