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errors.go
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errors.go
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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
)
var (
// ErrMissingIndex is returned e.g. from DeleteService if the index is missing.
ErrMissingIndex = errors.New("elastic: index is missing")
// ErrMissingType is returned e.g. from DeleteService if the type is missing.
ErrMissingType = errors.New("elastic: type is missing")
// ErrMissingId is returned e.g. from DeleteService if the document identifier is missing.
ErrMissingId = errors.New("elastic: id is missing")
)
// checkResponse will return an error if the request/response indicates
// an error returned from Elasticsearch.
//
// HTTP status codes between in the range [200..299] are considered successful.
// All other errors are considered errors except they are specified in
// ignoreErrors. This is necessary because for some services, HTTP status 404
// is a valid response from Elasticsearch (e.g. the Exists service).
//
// The func tries to parse error details as returned from Elasticsearch
// and encapsulates them in type elastic.Error.
func checkResponse(req *http.Request, res *http.Response, ignoreErrors ...int) error {
// 200-299 and 404 are valid status codes
if (res.StatusCode >= 200 && res.StatusCode <= 299) || res.StatusCode == http.StatusNotFound {
return nil
}
// Ignore certain errors?
for _, code := range ignoreErrors {
if code == res.StatusCode {
return nil
}
}
if res.Body == nil {
return fmt.Errorf("elastic: Error %d (%s)", res.StatusCode, http.StatusText(res.StatusCode))
}
slurp, err := ioutil.ReadAll(res.Body)
if err != nil {
return fmt.Errorf("elastic: Error %d (%s) when reading body: %v", res.StatusCode, http.StatusText(res.StatusCode), err)
}
return createResponseError(res.StatusCode, slurp)
}
// createResponseError creates an Error structure from the HTTP response,
// its status code and the error information sent by Elasticsearch.
func createResponseError(statusCode int, data []byte) error {
errReply := new(Error)
err := json.Unmarshal(data, errReply)
if err != nil {
return fmt.Errorf("elastic: Error %d (%s)", statusCode, http.StatusText(statusCode))
}
if errReply != nil {
if errReply.Status == 0 {
errReply.Status = statusCode
}
return errReply
}
return fmt.Errorf("elastic: Error %d (%s)", statusCode, http.StatusText(statusCode))
}
// Error encapsulates error details as returned from Elasticsearch.
type Error struct {
Status int `json:"status"`
Message string `json:"error"`
}
// Error returns a string representation of the error.
func (e *Error) Error() string {
if e.Message != "" {
return fmt.Sprintf("elastic: Error %d (%s): %s", e.Status, http.StatusText(e.Status), e.Message)
} else {
return fmt.Sprintf("elastic: Error %d (%s)", e.Status, http.StatusText(e.Status))
}
}