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Refactor state_* metricsets to share response from endpoint (#25640)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you 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 | ||
| // | ||
| // 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. | ||
|
|
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| package kubernetes | ||
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|
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| import ( | ||
| "sync" | ||
| "time" | ||
|
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| "github.com/mitchellh/hashstructure" | ||
| "github.com/pkg/errors" | ||
| dto "github.com/prometheus/client_model/go" | ||
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| p "github.com/elastic/beats/v7/metricbeat/helper/prometheus" | ||
| "github.com/elastic/beats/v7/metricbeat/mb" | ||
| ) | ||
|
|
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| func init() { | ||
| // Register the ModuleFactory function for the "kubernetes" module. | ||
| if err := mb.Registry.AddModule("kubernetes", ModuleBuilder()); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
|
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| type Module interface { | ||
| mb.Module | ||
| GetSharedFamilies(prometheus p.Prometheus) ([]*dto.MetricFamily, error) | ||
| } | ||
|
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| type familiesCache struct { | ||
| sharedFamilies []*dto.MetricFamily | ||
| lastFetchErr error | ||
| lastFetchTimestamp time.Time | ||
| } | ||
|
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| type kubeStateMetricsCache struct { | ||
| cacheMap map[uint64]*familiesCache | ||
| lock sync.Mutex | ||
| } | ||
|
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| func (c *kubeStateMetricsCache) getCacheMapEntry(hash uint64) *familiesCache { | ||
| c.lock.Lock() | ||
| defer c.lock.Unlock() | ||
| if _, ok := c.cacheMap[hash]; !ok { | ||
| c.cacheMap[hash] = &familiesCache{} | ||
| } | ||
| return c.cacheMap[hash] | ||
| } | ||
|
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| type module struct { | ||
| mb.BaseModule | ||
|
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| kubeStateMetricsCache *kubeStateMetricsCache | ||
| familiesCache *familiesCache | ||
| } | ||
|
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| func ModuleBuilder() func(base mb.BaseModule) (mb.Module, error) { | ||
| kubeStateMetricsCache := &kubeStateMetricsCache{ | ||
| cacheMap: make(map[uint64]*familiesCache), | ||
| } | ||
| return func(base mb.BaseModule) (mb.Module, error) { | ||
| hash, err := generateCacheHash(base.Config().Hosts) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "error generating cache hash for kubeStateMetricsCache") | ||
| } | ||
| // NOTE: These entries will be never removed, this can be a leak if | ||
| // metricbeat is used to monitor clusters dynamically created. | ||
| // (https://github.com/elastic/beats/pull/25640#discussion_r633395213) | ||
| familiesCache := kubeStateMetricsCache.getCacheMapEntry(hash) | ||
| m := module{ | ||
| BaseModule: base, | ||
| kubeStateMetricsCache: kubeStateMetricsCache, | ||
| familiesCache: familiesCache, | ||
| } | ||
| return &m, nil | ||
| } | ||
| } | ||
|
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| func (m *module) GetSharedFamilies(prometheus p.Prometheus) ([]*dto.MetricFamily, error) { | ||
| m.kubeStateMetricsCache.lock.Lock() | ||
| defer m.kubeStateMetricsCache.lock.Unlock() | ||
|
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| now := time.Now() | ||
|
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| if m.familiesCache.lastFetchTimestamp.IsZero() || now.Sub(m.familiesCache.lastFetchTimestamp) > m.Config().Period { | ||
| m.familiesCache.sharedFamilies, m.familiesCache.lastFetchErr = prometheus.GetFamilies() | ||
| m.familiesCache.lastFetchTimestamp = now | ||
| } | ||
|
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| return m.familiesCache.sharedFamilies, m.familiesCache.lastFetchErr | ||
| } | ||
|
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| func generateCacheHash(host []string) (uint64, error) { | ||
| id, err := hashstructure.Hash(host, nil) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| return id, nil | ||
| } |
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