istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/request/command.go (about)

     1  // Copyright Istio Authors
     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 request
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"io"
    21  	"net/http"
    22  	"strings"
    23  )
    24  
    25  // Command is a wrapper for making http requests to Pilot or Envoy via a CLI command.
    26  type Command struct {
    27  	Address string
    28  	Client  *http.Client
    29  }
    30  
    31  // Do executes an http request using the specified arguments
    32  func (c *Command) Do(method, path, body string) error {
    33  	bodyBuffer := bytes.NewBufferString(body)
    34  	path = strings.TrimPrefix(path, "/")
    35  	url := fmt.Sprintf("http://%v/%v", c.Address, path)
    36  	req, err := http.NewRequest(method, url, bodyBuffer)
    37  	if err != nil {
    38  		return err
    39  	}
    40  	resp, err := c.Client.Do(req)
    41  	if err != nil {
    42  		return err
    43  	}
    44  	defer resp.Body.Close()
    45  	respBody, err := io.ReadAll(resp.Body)
    46  	if err != nil {
    47  		return err
    48  	}
    49  	if resp.StatusCode > 399 && resp.StatusCode != 404 {
    50  		return fmt.Errorf("received unsuccessful status code %v: %v", resp.StatusCode, string(respBody))
    51  	}
    52  	fmt.Println(string(respBody))
    53  	return nil
    54  }