k8s.io/apiserver@v0.31.1/pkg/registry/generic/rest/response_checker.go (about)

     1  /*
     2  Copyright 2014 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package rest
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"io/ioutil"
    23  	"net/http"
    24  
    25  	"k8s.io/apimachinery/pkg/api/errors"
    26  	"k8s.io/apimachinery/pkg/runtime/schema"
    27  )
    28  
    29  // Check the http error status from a location URL.
    30  // And convert an error into a structured API object.
    31  // Finally ensure we close the body before returning the error
    32  type HttpResponseChecker interface {
    33  	Check(resp *http.Response) error
    34  }
    35  
    36  // Max length read from the response body of a location which returns error status
    37  const (
    38  	maxReadLength = 50000
    39  )
    40  
    41  // A generic http response checker to transform the error.
    42  type GenericHttpResponseChecker struct {
    43  	QualifiedResource schema.GroupResource
    44  	Name              string
    45  }
    46  
    47  func (checker GenericHttpResponseChecker) Check(resp *http.Response) error {
    48  	if resp.StatusCode < http.StatusOK || resp.StatusCode > http.StatusPartialContent {
    49  		defer resp.Body.Close()
    50  		bodyBytes, err := ioutil.ReadAll(io.LimitReader(resp.Body, maxReadLength))
    51  		if err != nil {
    52  			return errors.NewInternalError(err)
    53  		}
    54  		bodyText := string(bodyBytes)
    55  
    56  		switch {
    57  		case resp.StatusCode == http.StatusInternalServerError:
    58  			return errors.NewInternalError(fmt.Errorf("%s", bodyText))
    59  		case resp.StatusCode == http.StatusBadRequest:
    60  			return errors.NewBadRequest(bodyText)
    61  		case resp.StatusCode == http.StatusNotFound:
    62  			return errors.NewGenericServerResponse(resp.StatusCode, "", checker.QualifiedResource, checker.Name, bodyText, 0, false)
    63  		}
    64  		return errors.NewGenericServerResponse(resp.StatusCode, "", checker.QualifiedResource, checker.Name, bodyText, 0, false)
    65  	}
    66  	return nil
    67  }
    68  
    69  func NewGenericHttpResponseChecker(qualifiedResource schema.GroupResource, name string) GenericHttpResponseChecker {
    70  	return GenericHttpResponseChecker{QualifiedResource: qualifiedResource, Name: name}
    71  }