github.com/go-kivik/kivik/v4@v4.3.2/couchdb/chttp/errors.go (about)

     1  // Licensed under the Apache License, Version 2.0 (the "License"); you may not
     2  // use this file except in compliance with the License. You may obtain a copy of
     3  // the License at
     4  //
     5  //  http://www.apache.org/licenses/LICENSE-2.0
     6  //
     7  // Unless required by applicable law or agreed to in writing, software
     8  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     9  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    10  // License for the specific language governing permissions and limitations under
    11  // the License.
    12  
    13  package chttp
    14  
    15  import (
    16  	"encoding/json"
    17  	"fmt"
    18  	"mime"
    19  	"net/http"
    20  )
    21  
    22  // HTTPError is an error that represents an HTTP transport error.
    23  type HTTPError struct {
    24  	// Response is the HTTP response received by the client.  The response body
    25  	// should already be closed, but the response and request headers and other
    26  	// metadata will typically be in tact for debugging purposes.
    27  	Response *http.Response `json:"-"`
    28  
    29  	// Reason is the server-supplied error reason.
    30  	Reason string `json:"reason"`
    31  }
    32  
    33  func (e *HTTPError) Error() string {
    34  	if e.Reason == "" {
    35  		return http.StatusText(e.HTTPStatus())
    36  	}
    37  	if statusText := http.StatusText(e.HTTPStatus()); statusText != "" {
    38  		return fmt.Sprintf("%s: %s", statusText, e.Reason)
    39  	}
    40  	return e.Reason
    41  }
    42  
    43  // HTTPStatus returns the embedded status code.
    44  func (e *HTTPError) HTTPStatus() int {
    45  	return e.Response.StatusCode
    46  }
    47  
    48  // ResponseError returns an error from an *http.Response if the status code
    49  // indicates an error.
    50  func ResponseError(resp *http.Response) error {
    51  	if resp.StatusCode < 400 { // nolint:gomnd
    52  		return nil
    53  	}
    54  	if resp.Body != nil {
    55  		defer CloseBody(resp.Body)
    56  	}
    57  	httpErr := &HTTPError{
    58  		Response: resp,
    59  	}
    60  	if resp != nil && resp.Request != nil && resp.Request.Method != "HEAD" && resp.ContentLength != 0 {
    61  		if ct, _, _ := mime.ParseMediaType(resp.Header.Get("Content-Type")); ct == typeJSON {
    62  			_ = json.NewDecoder(resp.Body).Decode(httpErr)
    63  		}
    64  	}
    65  	return httpErr
    66  }