146 lines
3.3 KiB
Go
146 lines
3.3 KiB
Go
/*
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Copyright 2020 KubeSphere 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 auditing
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import (
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"bytes"
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"context"
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"crypto/tls"
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"encoding/json"
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"k8s.io/klog"
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"kubesphere.io/kubesphere/pkg/apiserver/auditing/v1alpha1"
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"net/http"
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"time"
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)
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const (
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WaitTimeout = time.Second
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WebhookURL = "https://kube-auditing-webhook-svc.kubesphere-logging-system.svc:443/audit/webhook/event"
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)
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type Backend struct {
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url string
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channelCapacity int
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semCh chan interface{}
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cache chan *v1alpha1.EventList
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client http.Client
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sendTimeout time.Duration
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waitTimeout time.Duration
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stopCh <-chan struct{}
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}
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func NewBackend(url string, channelCapacity int, cache chan *v1alpha1.EventList, sendTimeout time.Duration, stopCh <-chan struct{}) *Backend {
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b := Backend{
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url: url,
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semCh: make(chan interface{}, channelCapacity),
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channelCapacity: channelCapacity,
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waitTimeout: WaitTimeout,
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cache: cache,
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sendTimeout: sendTimeout,
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stopCh: stopCh,
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}
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if len(b.url) == 0 {
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b.url = WebhookURL
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}
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b.client = http.Client{
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Transport: &http.Transport{
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TLSClientConfig: &tls.Config{
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InsecureSkipVerify: true,
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},
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},
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Timeout: b.sendTimeout,
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}
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go b.worker()
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return &b
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}
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func (b *Backend) worker() {
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for {
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var event *v1alpha1.EventList
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select {
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case event = <-b.cache:
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if event == nil {
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break
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}
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case <-b.stopCh:
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break
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}
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send := func(event *v1alpha1.EventList) {
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ctx, cancel := context.WithTimeout(context.Background(), b.waitTimeout)
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defer cancel()
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select {
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case <-ctx.Done():
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klog.Errorf("get goroutine for audit(%s) timeout", event.Items[0].AuditID)
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return
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case b.semCh <- struct{}{}:
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}
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defer func() {
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<-b.semCh
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}()
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bs, err := b.eventToBytes(event)
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if err != nil {
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klog.V(6).Infof("json marshal error, %s", err)
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return
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}
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klog.V(8).Infof("%s", string(bs))
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response, err := b.client.Post(b.url, "application/json", bytes.NewBuffer(bs))
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if err != nil {
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klog.Errorf("send audit event[%s] error, %s", event.Items[0].AuditID, err)
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return
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}
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if response.StatusCode != http.StatusOK {
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klog.Errorf("send audit event[%s] error[%d]", event.Items[0].AuditID, response.StatusCode)
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return
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}
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}
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go send(event)
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}
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}
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func (b *Backend) eventToBytes(event *v1alpha1.EventList) ([]byte, error) {
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bs, err := json.Marshal(event)
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if err != nil {
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// Normally, the serialization failure is caused by the failure of ResponseObject serialization.
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// To ensure the integrity of the auditing event to the greatest extent,
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// it is necessary to delete ResponseObject and and then try to serialize again.
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if event.Items[0].ResponseObject != nil {
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event.Items[0].ResponseObject = nil
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return json.Marshal(event)
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}
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return nil, err
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}
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return bs, err
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}
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