github.com/elfadel/cilium@v1.6.12/pkg/health/probe/probe.go (about)

     1  // Copyright 2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package probe
    16  
    17  import (
    18  	"fmt"
    19  	"net/http"
    20  	"net/url"
    21  	"time"
    22  )
    23  
    24  // http Client for probing
    25  // Use our custom client since DefaultClient specifies timeout of 0 (no timeout).
    26  // See https://medium.com/@nate510/don-t-use-go-s-default-http-client-4804cb19f779.
    27  // Use a timeout of 30s.
    28  var client = &http.Client{Timeout: 30 * time.Second}
    29  
    30  // GetHello performs a GET request on the /hello endpoint
    31  func GetHello(host string) error {
    32  	hostURL, err := url.Parse(host)
    33  	if err != nil {
    34  		return err
    35  	}
    36  
    37  	requestURL, err := hostURL.Parse("/hello")
    38  	if err != nil {
    39  		return err
    40  	}
    41  
    42  	resp, err := client.Get(requestURL.String())
    43  	if err != nil {
    44  		return err
    45  	}
    46  	defer resp.Body.Close()
    47  
    48  	if resp.StatusCode != http.StatusOK {
    49  		return fmt.Errorf("unexpected status code: %d %s", resp.StatusCode, resp.Status)
    50  	}
    51  
    52  	return nil
    53  }