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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package memberlist
import (
"sync"
"time"
"github.com/armon/go-metrics"
)
// awareness manages a simple metric for tracking the estimated health of the
// local node. Health is primary the node's ability to respond in the soft
// real-time manner required for correct health checking of other nodes in the
// cluster.
type awareness struct {
sync.RWMutex
// max is the upper threshold for the timeout scale (the score will be
// constrained to be from 0 <= score < max).
max int
// score is the current awareness score. Lower values are healthier and
// zero is the minimum value.
score int
// metricLabels is the slice of labels to put on all emitted metrics
metricLabels []metrics.Label
}
// newAwareness returns a new awareness object.
func newAwareness(max int, metricLabels []metrics.Label) *awareness {
return &awareness{
max: max,
score: 0,
metricLabels: metricLabels,
}
}
// ApplyDelta takes the given delta and applies it to the score in a thread-safe
// manner. It also enforces a floor of zero and a max of max, so deltas may not
// change the overall score if it's railed at one of the extremes.
func (a *awareness) ApplyDelta(delta int) {
a.Lock()
initial := a.score
a.score += delta
if a.score < 0 {
a.score = 0
} else if a.score > (a.max - 1) {
a.score = (a.max - 1)
}
final := a.score
a.Unlock()
if initial != final {
metrics.SetGaugeWithLabels([]string{"memberlist", "health", "score"}, float32(final), a.metricLabels)
}
}
// GetHealthScore returns the raw health score.
func (a *awareness) GetHealthScore() int {
a.RLock()
score := a.score
a.RUnlock()
return score
}
// ScaleTimeout takes the given duration and scales it based on the current
// score. Less healthyness will lead to longer timeouts.
func (a *awareness) ScaleTimeout(timeout time.Duration) time.Duration {
a.RLock()
score := a.score
a.RUnlock()
return timeout * (time.Duration(score) + 1)
}