92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package dynamic
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import (
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"fmt"
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"time"
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auditregv1alpha1 "k8s.io/api/auditregistration/v1alpha1"
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"k8s.io/apiserver/pkg/audit"
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"k8s.io/apiserver/pkg/audit/policy"
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auditutil "k8s.io/apiserver/pkg/audit/util"
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"k8s.io/apiserver/pkg/util/webhook"
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bufferedplugin "k8s.io/apiserver/plugin/pkg/audit/buffered"
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enforcedplugin "k8s.io/apiserver/plugin/pkg/audit/dynamic/enforced"
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webhookplugin "k8s.io/apiserver/plugin/pkg/audit/webhook"
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)
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// TODO: find a common place for all the default retry backoffs
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const retryBackoff = 500 * time.Millisecond
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// factory builds a delegate from an AuditSink
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type factory struct {
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config *Config
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webhookClientManager webhook.ClientManager
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sink *auditregv1alpha1.AuditSink
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}
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// BuildDelegate creates a delegate from the AuditSink object
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func (f *factory) BuildDelegate() (*delegate, error) {
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backend, err := f.buildWebhookBackend()
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if err != nil {
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return nil, err
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}
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backend = f.applyEnforcedOpts(backend)
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backend = f.applyBufferedOpts(backend)
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ch := make(chan struct{})
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return &delegate{
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Backend: backend,
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configuration: f.sink,
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stopChan: ch,
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}, nil
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}
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func (f *factory) buildWebhookBackend() (audit.Backend, error) {
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hookClient := auditutil.HookClientConfigForSink(f.sink)
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client, err := f.webhookClientManager.HookClient(hookClient)
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if err != nil {
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return nil, fmt.Errorf("could not create webhook client: %v", err)
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}
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backend := webhookplugin.NewDynamicBackend(client, retryBackoff)
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return backend, nil
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}
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func (f *factory) applyEnforcedOpts(delegate audit.Backend) audit.Backend {
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pol := policy.ConvertDynamicPolicyToInternal(&f.sink.Spec.Policy)
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checker := policy.NewChecker(pol)
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eb := enforcedplugin.NewBackend(delegate, checker)
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return eb
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}
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func (f *factory) applyBufferedOpts(delegate audit.Backend) audit.Backend {
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bc := f.config.BufferedConfig
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tc := f.sink.Spec.Webhook.Throttle
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if tc != nil {
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bc.ThrottleEnable = true
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if tc.Burst != nil {
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bc.ThrottleBurst = int(*tc.Burst)
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}
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if tc.QPS != nil {
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bc.ThrottleQPS = float32(*tc.QPS)
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}
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} else {
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bc.ThrottleEnable = false
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}
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return bufferedplugin.NewBackend(delegate, *bc)
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}
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