freeleaps-ops/3rd/load-watcher/pkg/watcher/api/client.go
2025-03-19 15:59:37 +08:00

114 lines
3.1 KiB
Go

/*
Copyright 2021 PayPal
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 api
import (
"fmt"
"net/http"
"time"
"github.com/francoispqt/gojay"
"github.com/paypal/load-watcher/pkg/watcher"
"github.com/paypal/load-watcher/pkg/watcher/internal/metricsprovider"
"k8s.io/klog/v2"
)
const (
httpClientTimeoutSeconds = 55 * time.Second
)
// Client for Watcher APIs as a library
type libraryClient struct {
fetcherClient watcher.MetricsProviderClient
watcher *watcher.Watcher
}
// Client for Watcher APIs as a service
type serviceClient struct {
httpClient http.Client
watcherAddress string
}
// Creates a new watcher client when using watcher as a library
func NewLibraryClient(opts watcher.MetricsProviderOpts) (Client, error) {
var err error
client := libraryClient{}
switch opts.Name {
case watcher.PromClientName:
client.fetcherClient, err = metricsprovider.NewPromClient(opts)
case watcher.SignalFxClientName:
client.fetcherClient, err = metricsprovider.NewSignalFxClient(opts)
default:
client.fetcherClient, err = metricsprovider.NewMetricsServerClient()
}
if err != nil {
return client, err
}
client.watcher = watcher.NewWatcher(client.fetcherClient)
client.watcher.StartWatching()
return client, nil
}
// Creates a new watcher client when using watcher as a service
func NewServiceClient(watcherAddress string) (Client, error) {
return serviceClient{
httpClient: http.Client{
Timeout: httpClientTimeoutSeconds,
},
watcherAddress: watcherAddress,
}, nil
}
func (c libraryClient) GetLatestWatcherMetrics() (*watcher.WatcherMetrics, error) {
return c.watcher.GetLatestWatcherMetrics(watcher.FifteenMinutes)
}
func (c serviceClient) GetLatestWatcherMetrics() (*watcher.WatcherMetrics, error) {
req, err := http.NewRequest(http.MethodGet, c.watcherAddress+watcher.BaseUrl, nil)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
//TODO(aqadeer): Add a couple of retries for transient errors
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
klog.V(6).Infof("received status code %v from watcher", resp.StatusCode)
if resp.StatusCode == http.StatusOK {
data := watcher.Data{NodeMetricsMap: make(map[string]watcher.NodeMetrics)}
metrics := watcher.WatcherMetrics{Data: data}
dec := gojay.BorrowDecoder(resp.Body)
defer dec.Release()
err = dec.Decode(&metrics)
if err != nil {
klog.Errorf("unable to decode watcher metrics: %v", err)
return nil, err
} else {
return &metrics, nil
}
} else {
err = fmt.Errorf("received status code %v from watcher", resp.StatusCode)
klog.Error(err)
return nil, err
}
return nil, nil
}