github.com/go-kivik/kivik/v4@v4.3.2/x/kivikd/couchserver/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  //go:build !js
    14  
    15  package couchserver
    16  
    17  import (
    18  	"encoding/json"
    19  	"errors"
    20  	"fmt"
    21  	"net/http"
    22  
    23  	"github.com/go-kivik/kivik/v4"
    24  	internal "github.com/go-kivik/kivik/v4/int/errors"
    25  )
    26  
    27  func errorDescription(status int) string {
    28  	switch status {
    29  	case http.StatusUnauthorized:
    30  		return "unauthorized"
    31  	case http.StatusBadRequest:
    32  		return "bad_request"
    33  	case http.StatusNotFound:
    34  		return "not_found"
    35  	case http.StatusInternalServerError:
    36  		return "internal_server_error" // TODO: Validate that this is normative
    37  	case http.StatusNotImplemented:
    38  		return "not_implemented" // Non-standard
    39  	}
    40  	panic(fmt.Sprintf("unknown status %d", status))
    41  }
    42  
    43  type couchError struct {
    44  	Error  string `json:"error"`
    45  	Reason string `json:"reason"`
    46  }
    47  
    48  // HandleError returns a CouchDB-formatted error. It does nothing if err is nil.
    49  func (h *Handler) HandleError(w http.ResponseWriter, err error) {
    50  	if err == nil {
    51  		return
    52  	}
    53  	status := kivik.HTTPStatus(err)
    54  	w.WriteHeader(status)
    55  	var reason string
    56  	kerr := new(internal.Error)
    57  	if errors.As(err, &kerr) {
    58  		reason = kerr.Message
    59  	} else {
    60  		reason = err.Error()
    61  	}
    62  	wErr := json.NewEncoder(w).Encode(couchError{
    63  		Error:  errorDescription(status),
    64  		Reason: reason,
    65  	})
    66  	if wErr != nil {
    67  		h.Logger.Printf("Failed to send send error: %s", wErr)
    68  	}
    69  }