72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package client
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import (
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"math/rand"
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"time"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// jitter is the percent of jitter added to restart delays.
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const jitter = 0.25
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func newRestartTracker(policy *structs.RestartPolicy) *RestartTracker {
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return &RestartTracker{
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startTime: time.Now(),
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policy: policy,
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rand: rand.New(rand.NewSource(time.Now().Unix())),
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}
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}
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type RestartTracker struct {
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count int // Current number of attempts.
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startTime time.Time // When the interval began
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policy *structs.RestartPolicy
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rand *rand.Rand
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}
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func (r *RestartTracker) NextRestart(exitCode int) (bool, time.Duration) {
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// Check if we have entered a new interval.
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end := r.startTime.Add(r.policy.Interval)
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now := time.Now()
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if now.After(end) {
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r.count = 0
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r.startTime = now
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return true, r.jitter()
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}
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r.count++
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// If we are under the attempts, restart with delay.
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if r.count <= r.policy.Attempts {
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return r.shouldRestart(exitCode), r.jitter()
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}
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// Don't restart since mode is "fail"
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if r.policy.Mode == structs.RestartPolicyModeFail {
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return false, 0
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}
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// Apply an artifical wait to enter the next interval
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return r.shouldRestart(exitCode), end.Sub(now)
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}
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// shouldRestart returns whether a restart should occur based on the exit code
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// and the RestartOnSuccess configuration.
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func (r *RestartTracker) shouldRestart(exitCode int) bool {
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return exitCode != 0 || r.policy.RestartOnSuccess
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}
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// jitter returns the delay time plus a jitter.
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func (r *RestartTracker) jitter() time.Duration {
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d := r.policy.Delay.Nanoseconds()
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j := float64(r.rand.Int63n(d)) * jitter
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return time.Duration(d + int64(j))
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}
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// Returns a tracker that never restarts.
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func noRestartsTracker() *RestartTracker {
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policy := &structs.RestartPolicy{Attempts: 0, Mode: structs.RestartPolicyModeFail}
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return newRestartTracker(policy)
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}
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