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// Copyright 2012-present 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 (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"github.com/pkg/errors"
)
// 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 are valid status codes
if res.StatusCode >= 200 && res.StatusCode <= 299 {
return nil
}
// Ignore certain errors?
for _, code := range ignoreErrors {
if code == res.StatusCode {
return nil
}
}
return createResponseError(res)
}
// createResponseError creates an Error structure from the HTTP response,
// its status code and the error information sent by Elasticsearch.
func createResponseError(res *http.Response) error {
if res.Body == nil {
return &Error{Status: res.StatusCode}
}
data, err := ioutil.ReadAll(res.Body)
if err != nil {
return &Error{Status: res.StatusCode}
}
errReply := new(Error)
err = json.Unmarshal(data, errReply)
if err != nil {
return &Error{Status: res.StatusCode}
}
if errReply != nil {
if errReply.Status == 0 {
errReply.Status = res.StatusCode
}
return errReply
}
return &Error{Status: res.StatusCode}
}
// Error encapsulates error details as returned from Elasticsearch.
type Error struct {
Status int `json:"status"`
Details *ErrorDetails `json:"error,omitempty"`
}
// ErrorDetails encapsulate error details from Elasticsearch.
// It is used in e.g. elastic.Error and elastic.BulkResponseItem.
type ErrorDetails struct {
Type string `json:"type"`
Reason string `json:"reason"`
ResourceType string `json:"resource.type,omitempty"`
ResourceId string `json:"resource.id,omitempty"`
Index string `json:"index,omitempty"`
Phase string `json:"phase,omitempty"`
Grouped bool `json:"grouped,omitempty"`
CausedBy map[string]interface{} `json:"caused_by,omitempty"`
RootCause []*ErrorDetails `json:"root_cause,omitempty"`
FailedShards []map[string]interface{} `json:"failed_shards,omitempty"`
}
// Error returns a string representation of the error.
func (e *Error) Error() string {
if e.Details != nil && e.Details.Reason != "" {
return fmt.Sprintf("elastic: Error %d (%s): %s [type=%s]", e.Status, http.StatusText(e.Status), e.Details.Reason, e.Details.Type)
}
return fmt.Sprintf("elastic: Error %d (%s)", e.Status, http.StatusText(e.Status))
}
// IsContextErr returns true if the error is from a context that was canceled or deadline exceeded
func IsContextErr(err error) bool {
if err == context.Canceled || err == context.DeadlineExceeded {
return true
}
// This happens e.g. on redirect errors, see https://golang.org/src/net/http/client_test.go#L329
if ue, ok := err.(*url.Error); ok {
if ue.Temporary() {
return true
}
// Use of an AWS Signing Transport can result in a wrapped url.Error
return IsContextErr(ue.Err)
}
return false
}
// IsConnErr returns true if the error indicates that Elastic could not
// find an Elasticsearch host to connect to.
func IsConnErr(err error) bool {
return err == ErrNoClient || errors.Cause(err) == ErrNoClient
}
// IsNotFound returns true if the given error indicates that Elasticsearch
// returned HTTP status 404. The err parameter can be of type *elastic.Error,
// elastic.Error, *http.Response or int (indicating the HTTP status code).
func IsNotFound(err interface{}) bool {
return IsStatusCode(err, http.StatusNotFound)
}
// IsTimeout returns true if the given error indicates that Elasticsearch
// returned HTTP status 408. The err parameter can be of type *elastic.Error,
// elastic.Error, *http.Response or int (indicating the HTTP status code).
func IsTimeout(err interface{}) bool {
return IsStatusCode(err, http.StatusRequestTimeout)
}
// IsConflict returns true if the given error indicates that the Elasticsearch
// operation resulted in a version conflict. This can occur in operations like
// `update` or `index` with `op_type=create`. The err parameter can be of
// type *elastic.Error, elastic.Error, *http.Response or int (indicating the
// HTTP status code).
func IsConflict(err interface{}) bool {
return IsStatusCode(err, http.StatusConflict)
}
// IsStatusCode returns true if the given error indicates that the Elasticsearch
// operation returned the specified HTTP status code. The err parameter can be of
// type *http.Response, *Error, Error, or int (indicating the HTTP status code).
func IsStatusCode(err interface{}, code int) bool {
switch e := err.(type) {
case *http.Response:
return e.StatusCode == code
case *Error:
return e.Status == code
case Error:
return e.Status == code
case int:
return e == code
}
return false
}
// -- General errors --
// shardsInfo represents information from a shard.
type shardsInfo struct {
Total int `json:"total"`
Successful int `json:"successful"`
Failed int `json:"failed"`
}
// shardOperationFailure represents a shard failure.
type shardOperationFailure struct {
Shard int `json:"shard"`
Index string `json:"index"`
Status string `json:"status"`
// "reason"
}
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