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Handle rancher cluster with kube-prometheus-stack deployment (#133)
Signed-off-by: Tamal Saha <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| /* | ||
| Copyright AppsCode Inc. and Contributors | ||
| 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 | ||
| 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. | ||
| */ | ||
|
|
||
| package detector | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "sync" | ||
|
|
||
| "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring" | ||
| monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1" | ||
| "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" | ||
| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| clustermeta "kmodules.xyz/client-go/cluster" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| ) | ||
|
|
||
| var GVKPrometheus = schema.GroupVersionKind{ | ||
| Group: monitoring.GroupName, | ||
| Version: monitoringv1.Version, | ||
| Kind: "Prometheus", | ||
| } | ||
|
|
||
| type Detector interface { | ||
| Ready() (bool, error) | ||
| RancherManaged_() bool | ||
| Federated() bool | ||
| IsDefault(key types.NamespacedName) bool | ||
| } | ||
|
|
||
| func New(kc client.Client) Detector { | ||
| return &lazy{kc: kc} | ||
| } | ||
|
|
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| var errUnknown = errors.New("unknown") | ||
|
|
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| type lazy struct { | ||
| kc client.Client | ||
| delegated Detector | ||
| mu sync.Mutex | ||
| } | ||
|
|
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| var _ Detector = &lazy{} | ||
|
|
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| func (l *lazy) detect() error { | ||
| var list unstructured.UnstructuredList | ||
| list.SetGroupVersionKind(GVKPrometheus) | ||
| err := l.kc.List(context.TODO(), &list) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(list.Items) == 0 { | ||
| return errUnknown | ||
| } | ||
|
|
||
| if clustermeta.IsRancherManaged(l.kc.RESTMapper()) { | ||
| for _, obj := range list.Items { | ||
| if obj.GetNamespace() == clustermeta.NamespaceRancherMonitoring && | ||
| obj.GetName() == clustermeta.PrometheusRancherMonitoring { | ||
| l.delegated = &federated{} // rancher style federated | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| // rancher cluster but using prometheus directly | ||
| l.delegated = &standalone{rancher: true, singleton: len(list.Items) == 1} | ||
| return nil | ||
| } | ||
|
|
||
| // using prometheus directly and not rancher managed | ||
| l.delegated = &standalone{rancher: false, singleton: len(list.Items) == 1} | ||
| return nil | ||
| } | ||
|
|
||
| func (l *lazy) Ready() (bool, error) { | ||
| l.mu.Lock() | ||
| defer l.mu.Unlock() | ||
| if l.delegated == nil { | ||
| err := l.detect() | ||
| return err == nil, err | ||
| } | ||
| return true, nil | ||
| } | ||
|
|
||
| func (l *lazy) RancherManaged_() bool { | ||
| l.mu.Lock() | ||
| defer l.mu.Unlock() | ||
| if l.delegated == nil { | ||
| panic("NotReady") | ||
| } | ||
| return l.delegated.RancherManaged_() | ||
| } | ||
|
|
||
| func (l *lazy) Federated() bool { | ||
| l.mu.Lock() | ||
| defer l.mu.Unlock() | ||
| if l.delegated == nil { | ||
| panic("NotReady") | ||
| } | ||
| return l.delegated.Federated() | ||
| } | ||
|
|
||
| func (l *lazy) IsDefault(key types.NamespacedName) bool { | ||
| l.mu.Lock() | ||
| defer l.mu.Unlock() | ||
| if l.delegated == nil { | ||
| panic("NotReady") | ||
| } | ||
| return l.delegated.IsDefault(key) | ||
| } | ||
|
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| type federated struct{} | ||
|
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| var _ Detector = federated{} | ||
|
|
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| func (f federated) Ready() (bool, error) { | ||
| return true, nil | ||
| } | ||
|
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| func (f federated) RancherManaged_() bool { | ||
| return true | ||
| } | ||
|
|
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| func (f federated) Federated() bool { | ||
| return true | ||
| } | ||
|
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| func (f federated) IsDefault(key types.NamespacedName) bool { | ||
| return key.Namespace == clustermeta.NamespaceRancherMonitoring && | ||
| key.Name == clustermeta.PrometheusRancherMonitoring | ||
| } | ||
|
|
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| type standalone struct { | ||
| rancher bool | ||
| singleton bool | ||
| } | ||
|
|
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| var _ Detector = standalone{} | ||
|
|
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| func (s standalone) Ready() (bool, error) { | ||
| return true, nil | ||
| } | ||
|
|
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| func (s standalone) RancherManaged_() bool { | ||
| return s.rancher | ||
| } | ||
|
|
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| func (s standalone) Federated() bool { | ||
| return false | ||
| } | ||
|
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| func (s standalone) IsDefault(key types.NamespacedName) bool { | ||
| return s.singleton | ||
| } |