/
utils.go
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/
utils.go
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// Copyright 2019-2023 The Liqo Authors
//
// 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 utils contains functions useful for the discovery component,
// in particular during the communications with a remote cluster.
package utils
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"time"
"k8s.io/klog/v2"
"github.com/liqotech/liqo/pkg/auth"
)
const (
// HTTPRequestTimeout is the timeout used in http connection to a remote authentication service.
HTTPRequestTimeout = 5 * time.Second
)
// GetClusterInfo contacts the remote cluster to get its info,
// it returns also if the remote cluster exposes a trusted certificate.
func GetClusterInfo(ctx context.Context, transport *http.Transport, url string) (*auth.ClusterInfo, error) {
client := &http.Client{
Transport: transport,
Timeout: HTTPRequestTimeout,
}
resp, err := httpGet(ctx, client, fmt.Sprintf("%s%s", url, auth.IdsURI))
if err != nil {
return nil, err
}
defer resp.Body.Close()
respBytes, err := io.ReadAll(resp.Body)
if err != nil {
klog.Error(err)
return nil, err
}
var ids auth.ClusterInfo
if err = json.Unmarshal(respBytes, &ids); err != nil {
klog.Error(err)
return nil, err
}
return &ids, nil
}
func httpGet(ctx context.Context, client *http.Client, url string) (resp *http.Response, err error) {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, http.NoBody)
if err != nil {
klog.Error(err)
return nil, err
}
return client.Do(req)
}