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authorOpenShift Merge Robot <openshift-merge-robot@users.noreply.github.com>2020-05-21 15:32:07 +0200
committerGitHub <noreply@github.com>2020-05-21 15:32:07 +0200
commita594de2cf457a1a5e5fecd8329853e9ec19c5582 (patch)
treeb0e6f8f6cad5468b930d03491f1516ff1680b581 /vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go
parent72e880351a88ae54b69046ab14a9a4a52c51c78b (diff)
parentcdd1f2bbaf99f5fae8f5c08a25bccdf478cd9ada (diff)
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Merge pull request #6317 from containers/dependabot/go_modules/github.com/onsi/gomega-1.10.1
Bump github.com/onsi/gomega from 1.10.0 to 1.10.1
Diffstat (limited to 'vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go')
-rw-r--r--vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go97
1 files changed, 97 insertions, 0 deletions
diff --git a/vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go b/vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go
new file mode 100644
index 000000000..358b69e7f
--- /dev/null
+++ b/vendor/github.com/nxadm/tail/ratelimiter/leakybucket.go
@@ -0,0 +1,97 @@
+// Package ratelimiter implements the Leaky Bucket ratelimiting algorithm with memcached and in-memory backends.
+package ratelimiter
+
+import (
+ "time"
+)
+
+type LeakyBucket struct {
+ Size uint16
+ Fill float64
+ LeakInterval time.Duration // time.Duration for 1 unit of size to leak
+ Lastupdate time.Time
+ Now func() time.Time
+}
+
+func NewLeakyBucket(size uint16, leakInterval time.Duration) *LeakyBucket {
+ bucket := LeakyBucket{
+ Size: size,
+ Fill: 0,
+ LeakInterval: leakInterval,
+ Now: time.Now,
+ Lastupdate: time.Now(),
+ }
+
+ return &bucket
+}
+
+func (b *LeakyBucket) updateFill() {
+ now := b.Now()
+ if b.Fill > 0 {
+ elapsed := now.Sub(b.Lastupdate)
+
+ b.Fill -= float64(elapsed) / float64(b.LeakInterval)
+ if b.Fill < 0 {
+ b.Fill = 0
+ }
+ }
+ b.Lastupdate = now
+}
+
+func (b *LeakyBucket) Pour(amount uint16) bool {
+ b.updateFill()
+
+ var newfill float64 = b.Fill + float64(amount)
+
+ if newfill > float64(b.Size) {
+ return false
+ }
+
+ b.Fill = newfill
+
+ return true
+}
+
+// The time at which this bucket will be completely drained
+func (b *LeakyBucket) DrainedAt() time.Time {
+ return b.Lastupdate.Add(time.Duration(b.Fill * float64(b.LeakInterval)))
+}
+
+// The duration until this bucket is completely drained
+func (b *LeakyBucket) TimeToDrain() time.Duration {
+ return b.DrainedAt().Sub(b.Now())
+}
+
+func (b *LeakyBucket) TimeSinceLastUpdate() time.Duration {
+ return b.Now().Sub(b.Lastupdate)
+}
+
+type LeakyBucketSer struct {
+ Size uint16
+ Fill float64
+ LeakInterval time.Duration // time.Duration for 1 unit of size to leak
+ Lastupdate time.Time
+}
+
+func (b *LeakyBucket) Serialise() *LeakyBucketSer {
+ bucket := LeakyBucketSer{
+ Size: b.Size,
+ Fill: b.Fill,
+ LeakInterval: b.LeakInterval,
+ Lastupdate: b.Lastupdate,
+ }
+
+ return &bucket
+}
+
+func (b *LeakyBucketSer) DeSerialise() *LeakyBucket {
+ bucket := LeakyBucket{
+ Size: b.Size,
+ Fill: b.Fill,
+ LeakInterval: b.LeakInterval,
+ Lastupdate: b.Lastupdate,
+ Now: time.Now,
+ }
+
+ return &bucket
+}