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Merge pull request #1449 from openziti/sdk-hosting-test
sdk hosting test
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| /* | ||
| Copyright NetFoundry Inc. | ||
| 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 | ||
| https://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package command | ||
|
|
||
| import ( | ||
| "github.com/openziti/metrics" | ||
| "github.com/openziti/ziti/controller/apierror" | ||
| "github.com/pkg/errors" | ||
| "sync/atomic" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| MetricLimiterCurrentQueuedCount = "command.limiter.queued_count" | ||
| MetricLimiterWorkTimer = "command.limiter.work_timer" | ||
|
|
||
| DefaultLimiterSize = 100 | ||
| MinLimiterSize = 10 | ||
| ) | ||
|
|
||
| type RateLimiterConfig struct { | ||
| Enabled bool | ||
| QueueSize uint32 | ||
| } | ||
|
|
||
| func NewRateLimiter(config RateLimiterConfig, registry metrics.Registry, closeNotify <-chan struct{}) RateLimiter { | ||
| if !config.Enabled { | ||
| return NoOpRateLimiter{} | ||
| } | ||
|
|
||
| if config.QueueSize < MinLimiterSize { | ||
| config.QueueSize = MinLimiterSize | ||
| } | ||
|
|
||
| result := &DefaultRateLimiter{ | ||
| queue: make(chan *rateLimitedWork, config.QueueSize), | ||
| closeNotify: closeNotify, | ||
| workRate: registry.Timer(MetricLimiterWorkTimer), | ||
| } | ||
|
|
||
| if existing := registry.GetGauge(MetricLimiterCurrentQueuedCount); existing != nil { | ||
| existing.Dispose() | ||
| } | ||
|
|
||
| registry.FuncGauge(MetricLimiterCurrentQueuedCount, func() int64 { | ||
| return int64(result.currentSize.Load()) | ||
| }) | ||
|
|
||
| go result.run() | ||
|
|
||
| return result | ||
| } | ||
|
|
||
| type RateLimiter interface { | ||
| RunRateLimited(func() error) error | ||
| } | ||
|
|
||
| type NoOpRateLimiter struct{} | ||
|
|
||
| func (self NoOpRateLimiter) RunRateLimited(f func() error) error { | ||
| return f() | ||
| } | ||
|
|
||
| type rateLimitedWork struct { | ||
| wrapped func() error | ||
| result chan error | ||
| } | ||
|
|
||
| type DefaultRateLimiter struct { | ||
| currentSize atomic.Int32 | ||
| queue chan *rateLimitedWork | ||
| closeNotify <-chan struct{} | ||
| workRate metrics.Timer | ||
| } | ||
|
|
||
| func (self *DefaultRateLimiter) RunRateLimited(f func() error) error { | ||
| work := &rateLimitedWork{ | ||
| wrapped: f, | ||
| result: make(chan error, 1), | ||
| } | ||
| select { | ||
| case self.queue <- work: | ||
| self.currentSize.Add(1) | ||
| select { | ||
| case result := <-work.result: | ||
| return result | ||
| case <-self.closeNotify: | ||
| return errors.New("rate limiter shutting down") | ||
| } | ||
| case <-self.closeNotify: | ||
| return errors.New("rate limiter shutting down") | ||
| default: | ||
| return apierror.NewTooManyUpdatesError() | ||
| } | ||
| } | ||
|
|
||
| func (self *DefaultRateLimiter) run() { | ||
| defer self.workRate.Dispose() | ||
|
|
||
| for { | ||
| select { | ||
| case work := <-self.queue: | ||
| self.currentSize.Add(-1) | ||
| startTime := time.Now() | ||
| result := work.wrapped() | ||
| self.workRate.UpdateSince(startTime) | ||
| if result != nil { | ||
| work.result <- result | ||
| } | ||
| close(work.result) | ||
| case <-self.closeNotify: | ||
| return | ||
| } | ||
| } | ||
| } |
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