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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"
"fmt"
"net/url"
"strings"
)
// -- Actions --
// AliasAction is an action to apply to an alias, e.g. "add" or "remove".
type AliasAction interface {
Source() (interface{}, error)
}
// AliasAddAction is an action to add to an alias.
type AliasAddAction struct {
index []string // index name(s)
alias string // alias name
filter Query
routing string
searchRouting string
indexRouting string
}
// NewAliasAddAction returns an action to add an alias.
func NewAliasAddAction(alias string) *AliasAddAction {
return &AliasAddAction{
alias: alias,
}
}
// Index associates one or more indices to the alias.
func (a *AliasAddAction) Index(index ...string) *AliasAddAction {
a.index = append(a.index, index...)
return a
}
func (a *AliasAddAction) removeBlankIndexNames() {
var indices []string
for _, index := range a.index {
if len(index) > 0 {
indices = append(indices, index)
}
}
a.index = indices
}
// Filter associates a filter to the alias.
func (a *AliasAddAction) Filter(filter Query) *AliasAddAction {
a.filter = filter
return a
}
// Routing associates a routing value to the alias.
// This basically sets index and search routing to the same value.
func (a *AliasAddAction) Routing(routing string) *AliasAddAction {
a.routing = routing
return a
}
// IndexRouting associates an index routing value to the alias.
func (a *AliasAddAction) IndexRouting(routing string) *AliasAddAction {
a.indexRouting = routing
return a
}
// SearchRouting associates a search routing value to the alias.
func (a *AliasAddAction) SearchRouting(routing ...string) *AliasAddAction {
a.searchRouting = strings.Join(routing, ",")
return a
}
// Validate checks if the operation is valid.
func (a *AliasAddAction) Validate() error {
var invalid []string
if len(a.alias) == 0 {
invalid = append(invalid, "Alias")
}
if len(a.index) == 0 {
invalid = append(invalid, "Index")
}
if len(invalid) > 0 {
return fmt.Errorf("missing required fields: %v", invalid)
}
return nil
}
// Source returns the JSON-serializable data.
func (a *AliasAddAction) Source() (interface{}, error) {
a.removeBlankIndexNames()
if err := a.Validate(); err != nil {
return nil, err
}
src := make(map[string]interface{})
act := make(map[string]interface{})
src["add"] = act
act["alias"] = a.alias
switch len(a.index) {
case 1:
act["index"] = a.index[0]
default:
act["indices"] = a.index
}
if a.filter != nil {
f, err := a.filter.Source()
if err != nil {
return nil, err
}
act["filter"] = f
}
if len(a.routing) > 0 {
act["routing"] = a.routing
}
if len(a.indexRouting) > 0 {
act["index_routing"] = a.indexRouting
}
if len(a.searchRouting) > 0 {
act["search_routing"] = a.searchRouting
}
return src, nil
}
// AliasRemoveAction is an action to remove an alias.
type AliasRemoveAction struct {
index []string // index name(s)
alias string // alias name
}
// NewAliasRemoveAction returns an action to remove an alias.
func NewAliasRemoveAction(alias string) *AliasRemoveAction {
return &AliasRemoveAction{
alias: alias,
}
}
// Index associates one or more indices to the alias.
func (a *AliasRemoveAction) Index(index ...string) *AliasRemoveAction {
a.index = append(a.index, index...)
return a
}
func (a *AliasRemoveAction) removeBlankIndexNames() {
var indices []string
for _, index := range a.index {
if len(index) > 0 {
indices = append(indices, index)
}
}
a.index = indices
}
// Validate checks if the operation is valid.
func (a *AliasRemoveAction) Validate() error {
var invalid []string
if len(a.alias) == 0 {
invalid = append(invalid, "Alias")
}
if len(a.index) == 0 {
invalid = append(invalid, "Index")
}
if len(invalid) > 0 {
return fmt.Errorf("missing required fields: %v", invalid)
}
return nil
}
// Source returns the JSON-serializable data.
func (a *AliasRemoveAction) Source() (interface{}, error) {
a.removeBlankIndexNames()
if err := a.Validate(); err != nil {
return nil, err
}
src := make(map[string]interface{})
act := make(map[string]interface{})
src["remove"] = act
act["alias"] = a.alias
switch len(a.index) {
case 1:
act["index"] = a.index[0]
default:
act["indices"] = a.index
}
return src, nil
}
// -- Service --
// AliasService enables users to add or remove an alias.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/indices-aliases.html
// for details.
type AliasService struct {
client *Client
actions []AliasAction
pretty bool
}
// NewAliasService implements a service to manage aliases.
func NewAliasService(client *Client) *AliasService {
builder := &AliasService{
client: client,
}
return builder
}
// Pretty asks Elasticsearch to indent the HTTP response.
func (s *AliasService) Pretty(pretty bool) *AliasService {
s.pretty = pretty
return s
}
// Add adds an alias to an index.
func (s *AliasService) Add(indexName string, aliasName string) *AliasService {
action := NewAliasAddAction(aliasName).Index(indexName)
s.actions = append(s.actions, action)
return s
}
// Add adds an alias to an index and associates a filter to the alias.
func (s *AliasService) AddWithFilter(indexName string, aliasName string, filter Query) *AliasService {
action := NewAliasAddAction(aliasName).Index(indexName).Filter(filter)
s.actions = append(s.actions, action)
return s
}
// Remove removes an alias.
func (s *AliasService) Remove(indexName string, aliasName string) *AliasService {
action := NewAliasRemoveAction(aliasName).Index(indexName)
s.actions = append(s.actions, action)
return s
}
// Action accepts one or more AliasAction instances which can be
// of type AliasAddAction or AliasRemoveAction.
func (s *AliasService) Action(action ...AliasAction) *AliasService {
s.actions = append(s.actions, action...)
return s
}
// buildURL builds the URL for the operation.
func (s *AliasService) buildURL() (string, url.Values, error) {
path := "/_aliases"
// Add query string parameters
params := url.Values{}
if s.pretty {
params.Set("pretty", fmt.Sprintf("%v", s.pretty))
}
return path, params, nil
}
// Do executes the command.
func (s *AliasService) Do(ctx context.Context) (*AliasResult, error) {
path, params, err := s.buildURL()
if err != nil {
return nil, err
}
// Body with actions
body := make(map[string]interface{})
var actions []interface{}
for _, action := range s.actions {
src, err := action.Source()
if err != nil {
return nil, err
}
actions = append(actions, src)
}
body["actions"] = actions
// Get response
res, err := s.client.PerformRequest(ctx, "POST", path, params, body)
if err != nil {
return nil, err
}
// Return results
ret := new(AliasResult)
if err := s.client.decoder.Decode(res.Body, ret); err != nil {
return nil, err
}
return ret, nil
}
// -- Result of an alias request.
// AliasResult is the outcome of calling Do on AliasService.
type AliasResult struct {
Acknowledged bool `json:"acknowledged"`
}
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