github.com/google/cadvisor@v0.49.1/container/podman/podman.go (about)

     1  // Copyright 2021 Google Inc. All Rights Reserved.
     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 podman
    16  
    17  import (
    18  	"context"
    19  	"encoding/json"
    20  	"fmt"
    21  	"io"
    22  	"net/http"
    23  	"time"
    24  
    25  	dockertypes "github.com/docker/docker/api/types"
    26  	"github.com/pkg/errors"
    27  
    28  	"github.com/google/cadvisor/container/docker"
    29  	"github.com/google/cadvisor/container/docker/utils"
    30  	v1 "github.com/google/cadvisor/info/v1"
    31  )
    32  
    33  const (
    34  	Namespace = "podman"
    35  )
    36  
    37  var timeout = 10 * time.Second
    38  
    39  func validateResponse(gotError error, response *http.Response) error {
    40  	var err error
    41  	switch {
    42  	case response == nil:
    43  		err = fmt.Errorf("response not present")
    44  	case response.StatusCode == http.StatusNotFound:
    45  		err = fmt.Errorf("item not found")
    46  	case response.StatusCode == http.StatusNotImplemented:
    47  		err = fmt.Errorf("query not implemented")
    48  	default:
    49  		return gotError
    50  	}
    51  
    52  	if gotError != nil {
    53  		err = errors.Wrap(gotError, err.Error())
    54  	}
    55  
    56  	return err
    57  }
    58  
    59  func apiGetRequest(url string, item interface{}) error {
    60  	ctx, cancel := context.WithTimeout(context.Background(), timeout)
    61  	defer cancel()
    62  
    63  	conn, err := client(&ctx)
    64  	if err != nil {
    65  		return err
    66  	}
    67  
    68  	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
    69  	if err != nil {
    70  		return err
    71  	}
    72  
    73  	resp, err := conn.Client.Do(req)
    74  	err = validateResponse(err, resp)
    75  	if err != nil {
    76  		return err
    77  	}
    78  	defer resp.Body.Close()
    79  
    80  	data, err := io.ReadAll(resp.Body)
    81  	if err != nil {
    82  		return err
    83  
    84  	}
    85  
    86  	err = json.Unmarshal(data, item)
    87  	if err != nil {
    88  		return err
    89  	}
    90  
    91  	return ctx.Err()
    92  }
    93  
    94  func Images() ([]v1.DockerImage, error) {
    95  	var summaries []dockertypes.ImageSummary
    96  	err := apiGetRequest("http://d/v1.0.0/images/json", &summaries)
    97  	if err != nil {
    98  		return nil, err
    99  	}
   100  	return utils.SummariesToImages(summaries)
   101  }
   102  
   103  func Status() (v1.DockerStatus, error) {
   104  	podmanInfo, err := GetInfo()
   105  	if err != nil {
   106  		return v1.DockerStatus{}, err
   107  	}
   108  
   109  	return docker.StatusFromDockerInfo(*podmanInfo)
   110  }
   111  
   112  func GetInfo() (*dockertypes.Info, error) {
   113  	var info dockertypes.Info
   114  	err := apiGetRequest("http://d/v1.0.0/info", &info)
   115  	return &info, err
   116  }
   117  
   118  func VersionString() (string, error) {
   119  	var version dockertypes.Version
   120  	err := apiGetRequest("http://d/v1.0.0/version", &version)
   121  	if err != nil {
   122  		return "Unknown", err
   123  	}
   124  
   125  	return version.Version, nil
   126  }
   127  
   128  func InspectContainer(id string) (dockertypes.ContainerJSON, error) {
   129  	var data dockertypes.ContainerJSON
   130  	err := apiGetRequest(fmt.Sprintf("http://d/v1.0.0/containers/%s/json", id), &data)
   131  	return data, err
   132  }