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129 changes: 129 additions & 0 deletions
129
operators/pkg/controller/elasticsearch/driver/esstate.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package driver | ||
|
|
||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
|
|
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| "github.com/elastic/cloud-on-k8s/operators/pkg/apis/elasticsearch/v1alpha1" | ||
| esclient "github.com/elastic/cloud-on-k8s/operators/pkg/controller/elasticsearch/client" | ||
| "github.com/elastic/cloud-on-k8s/operators/pkg/utils/stringsutil" | ||
| ) | ||
|
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| type ESState interface { | ||
| NodesInCluster(nodeNames []string) (bool, error) | ||
| ShardAllocationsEnabled() (bool, error) | ||
| GreenHealth() (bool, error) | ||
| } | ||
|
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| type LazyESState struct { | ||
| esClient esclient.Client | ||
| *lazyNodes | ||
| *lazyShardsAllocationEnabled | ||
| *lazyGreenHealth | ||
| } | ||
|
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| func NewLazyESState(esClient esclient.Client) ESState { | ||
| return &LazyESState{ | ||
| esClient: esClient, | ||
| lazyNodes: &lazyNodes{esClient: esClient}, | ||
| lazyShardsAllocationEnabled: &lazyShardsAllocationEnabled{esClient: esClient}, | ||
| lazyGreenHealth: &lazyGreenHealth{esClient: esClient}, | ||
| } | ||
| } | ||
|
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| func initOnce(once *sync.Once, f func() error) error { | ||
| var err error | ||
| once.Do(func() { | ||
| err = f() | ||
| }) | ||
| return err | ||
| } | ||
|
|
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| // -- Nodes | ||
|
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| type lazyNodes struct { | ||
| once sync.Once | ||
| esClient esclient.Client | ||
| nodes []string | ||
| } | ||
|
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| func (n *lazyNodes) initialize() error { | ||
| ctx, cancel := context.WithTimeout(context.Background(), esclient.DefaultReqTimeout) | ||
| defer cancel() | ||
| nodes, err := n.esClient.GetNodes(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| n.nodes = nodes.Names() | ||
| return nil | ||
| } | ||
|
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| func (n *lazyNodes) nodeInCluster(nodeName string) (bool, error) { | ||
| if err := initOnce(&n.once, n.initialize); err != nil { | ||
| return false, err | ||
| } | ||
| return stringsutil.StringInSlice(nodeName, n.nodes), nil | ||
| } | ||
|
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| func (n *lazyNodes) NodesInCluster(nodeNames []string) (bool, error) { | ||
| if err := initOnce(&n.once, n.initialize); err != nil { | ||
| return false, err | ||
| } | ||
| return stringsutil.StringsInSlice(nodeNames, n.nodes), nil | ||
| } | ||
|
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| // -- Shards allocation enabled | ||
|
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| type lazyShardsAllocationEnabled struct { | ||
| once sync.Once | ||
| esClient esclient.Client | ||
| enabled bool | ||
| } | ||
|
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| func (s *lazyShardsAllocationEnabled) initialize() error { | ||
| ctx, cancel := context.WithTimeout(context.Background(), esclient.DefaultReqTimeout) | ||
| defer cancel() | ||
| allocationSettings, err := s.esClient.GetClusterRoutingAllocation(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| s.enabled = allocationSettings.Transient.IsShardsAllocationEnabled() | ||
| return nil | ||
| } | ||
|
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| func (s *lazyShardsAllocationEnabled) ShardAllocationsEnabled() (bool, error) { | ||
| if err := initOnce(&s.once, s.initialize); err != nil { | ||
| return false, err | ||
| } | ||
| return s.enabled, nil | ||
| } | ||
|
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| // -- Green health | ||
|
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| type lazyGreenHealth struct { | ||
| once sync.Once | ||
| esClient esclient.Client | ||
| greenHealth bool | ||
| } | ||
|
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| func (h *lazyGreenHealth) initialize() error { | ||
| ctx, cancel := context.WithTimeout(context.Background(), esclient.DefaultReqTimeout) | ||
| defer cancel() | ||
| health, err := h.esClient.GetClusterHealth(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| h.greenHealth = health.Status == string(v1alpha1.ElasticsearchGreenHealth) | ||
| return nil | ||
| } | ||
|
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| func (h *lazyGreenHealth) GreenHealth() (bool, error) { | ||
| if err := initOnce(&h.once, h.initialize); err != nil { | ||
| return false, err | ||
| } | ||
| return h.greenHealth, nil | ||
| } |
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