forked from kubewharf/katalyst-core
116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
/*
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Copyright 2022 The Katalyst 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 remote
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import (
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"context"
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"fmt"
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"net/http"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/klog/v2"
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katalystbase "github.com/kubewharf/katalyst-core/cmd/base"
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"github.com/kubewharf/katalyst-core/pkg/custom-metric/store/local"
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"github.com/kubewharf/katalyst-core/pkg/util/native"
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servicediscovery "github.com/kubewharf/katalyst-core/pkg/util/service-discovery"
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)
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const httpMetricURL = "http://%v"
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// ShardingController is responsible to separate the metric store into
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// several sharding pieces to tolerant single node failure, as well as
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// avoiding memory pressure in single node.
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//
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// todo: currently, it not really a valid
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type ShardingController struct {
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ctx context.Context
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serviceDiscoveryManager servicediscovery.ServiceDiscoveryManager
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totalCount int
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}
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func NewShardingController(ctx context.Context, baseCtx *katalystbase.GenericContext, podSelector labels.Selector, totalCount int) *ShardingController {
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// since collector will define its own pod/node label selectors, so we will construct informer separately
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s := &ShardingController{
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ctx: ctx,
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totalCount: totalCount,
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serviceDiscoveryManager: servicediscovery.NewPodInformerServiceDiscoveryManager(ctx, baseCtx.Client.KubeClient,
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podSelector, native.ContainerMetricStorePortName),
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}
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return s
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}
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func (s *ShardingController) Start() error {
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return s.serviceDiscoveryManager.Run()
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}
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func (s *ShardingController) Stop() error {
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return nil
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}
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// GetRWCount returns the quorum read/write counts
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func (s *ShardingController) GetRWCount() (int, int) {
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r := (s.totalCount + 1) / 2
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w := s.totalCount - r + 1
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return r, w
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}
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// GetRequests returns the pre-generated http requests
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func (s *ShardingController) GetRequests(path string) ([]*http.Request, error) {
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endpoints, err := s.serviceDiscoveryManager.GetEndpoints()
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if err != nil {
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return nil, fmt.Errorf("failed get endpoints from serviceDiscoveryManager: %v", err)
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}
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requests := make([]*http.Request, 0, len(endpoints))
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for _, endpoint := range endpoints {
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req, err := s.generateRequest(endpoint, path)
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if err != nil {
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klog.Errorf("failed to generate request err: %v", err)
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continue
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}
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requests = append(requests, req)
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}
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return requests, nil
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}
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func (s *ShardingController) generateRequest(endpoint, path string) (*http.Request, error) {
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url := fmt.Sprintf(httpMetricURL, endpoint+path)
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return nil, fmt.Errorf("new http request for %v err: %v", url, err)
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}
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req.Header.Add("Accept-Encoding", "gzip")
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req.Header.Set("User-Agent", "remote-store")
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switch path {
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case local.ServingGetPath:
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req.Method = "GET"
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case local.ServingSetPath:
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req.Method = "POST"
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case local.ServingListPath:
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req.Method = "GET"
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}
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return req, nil
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}
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