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400 lines
10 KiB
Go
400 lines
10 KiB
Go
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// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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import (
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"context"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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)
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// -- Actions --
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// AliasAction is an action to apply to an alias, e.g. "add" or "remove".
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type AliasAction interface {
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Source() (interface{}, error)
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}
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// AliasAddAction is an action to add to an alias.
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type AliasAddAction struct {
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index []string // index name(s)
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alias string // alias name
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filter Query
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routing string
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searchRouting string
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indexRouting string
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isWriteIndex *bool
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}
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// NewAliasAddAction returns an action to add an alias.
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func NewAliasAddAction(alias string) *AliasAddAction {
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return &AliasAddAction{
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alias: alias,
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}
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}
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// Index associates one or more indices to the alias.
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func (a *AliasAddAction) Index(index ...string) *AliasAddAction {
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a.index = append(a.index, index...)
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return a
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}
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func (a *AliasAddAction) removeBlankIndexNames() {
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var indices []string
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for _, index := range a.index {
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if len(index) > 0 {
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indices = append(indices, index)
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}
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}
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a.index = indices
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}
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// Filter associates a filter to the alias.
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func (a *AliasAddAction) Filter(filter Query) *AliasAddAction {
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a.filter = filter
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return a
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}
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// Routing associates a routing value to the alias.
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// This basically sets index and search routing to the same value.
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func (a *AliasAddAction) Routing(routing string) *AliasAddAction {
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a.routing = routing
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return a
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}
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// IndexRouting associates an index routing value to the alias.
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func (a *AliasAddAction) IndexRouting(routing string) *AliasAddAction {
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a.indexRouting = routing
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return a
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}
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// SearchRouting associates a search routing value to the alias.
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func (a *AliasAddAction) SearchRouting(routing ...string) *AliasAddAction {
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a.searchRouting = strings.Join(routing, ",")
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return a
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}
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// IsWriteIndex associates an is_write_index flag to the alias.
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func (a *AliasAddAction) IsWriteIndex(flag bool) *AliasAddAction {
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a.isWriteIndex = &flag
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return a
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}
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// Validate checks if the operation is valid.
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func (a *AliasAddAction) Validate() error {
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var invalid []string
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if len(a.alias) == 0 {
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invalid = append(invalid, "Alias")
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}
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if len(a.index) == 0 {
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invalid = append(invalid, "Index")
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}
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if len(invalid) > 0 {
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return fmt.Errorf("missing required fields: %v", invalid)
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}
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if a.isWriteIndex != nil && len(a.index) > 1 {
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return fmt.Errorf("more than 1 target index specified in operation with 'is_write_index' flag present")
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}
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return nil
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}
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// Source returns the JSON-serializable data.
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func (a *AliasAddAction) Source() (interface{}, error) {
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a.removeBlankIndexNames()
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if err := a.Validate(); err != nil {
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return nil, err
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}
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src := make(map[string]interface{})
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act := make(map[string]interface{})
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src["add"] = act
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act["alias"] = a.alias
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switch len(a.index) {
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case 1:
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act["index"] = a.index[0]
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default:
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act["indices"] = a.index
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}
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if a.filter != nil {
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f, err := a.filter.Source()
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if err != nil {
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return nil, err
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}
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act["filter"] = f
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}
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if len(a.routing) > 0 {
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act["routing"] = a.routing
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}
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if len(a.indexRouting) > 0 {
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act["index_routing"] = a.indexRouting
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}
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if len(a.searchRouting) > 0 {
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act["search_routing"] = a.searchRouting
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}
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if a.isWriteIndex != nil {
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act["is_write_index"] = *a.isWriteIndex
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}
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return src, nil
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}
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// AliasRemoveAction is an action to remove an alias.
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type AliasRemoveAction struct {
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index []string // index name(s)
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alias string // alias name
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}
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// NewAliasRemoveAction returns an action to remove an alias.
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func NewAliasRemoveAction(alias string) *AliasRemoveAction {
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return &AliasRemoveAction{
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alias: alias,
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}
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}
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// Index associates one or more indices to the alias.
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func (a *AliasRemoveAction) Index(index ...string) *AliasRemoveAction {
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a.index = append(a.index, index...)
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return a
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}
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func (a *AliasRemoveAction) removeBlankIndexNames() {
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var indices []string
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for _, index := range a.index {
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if len(index) > 0 {
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indices = append(indices, index)
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}
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}
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a.index = indices
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}
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// Validate checks if the operation is valid.
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func (a *AliasRemoveAction) Validate() error {
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var invalid []string
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if len(a.alias) == 0 {
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invalid = append(invalid, "Alias")
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}
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if len(a.index) == 0 {
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invalid = append(invalid, "Index")
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}
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if len(invalid) > 0 {
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return fmt.Errorf("missing required fields: %v", invalid)
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}
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return nil
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}
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// Source returns the JSON-serializable data.
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func (a *AliasRemoveAction) Source() (interface{}, error) {
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a.removeBlankIndexNames()
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if err := a.Validate(); err != nil {
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return nil, err
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}
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src := make(map[string]interface{})
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act := make(map[string]interface{})
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src["remove"] = act
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act["alias"] = a.alias
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switch len(a.index) {
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case 1:
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act["index"] = a.index[0]
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default:
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act["indices"] = a.index
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}
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return src, nil
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}
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// AliasRemoveIndexAction is an action to remove an index during an alias
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// operation.
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type AliasRemoveIndexAction struct {
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index string // index name
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}
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// NewAliasRemoveIndexAction returns an action to remove an index.
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func NewAliasRemoveIndexAction(index string) *AliasRemoveIndexAction {
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return &AliasRemoveIndexAction{
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index: index,
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}
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}
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// Validate checks if the operation is valid.
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func (a *AliasRemoveIndexAction) Validate() error {
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if a.index == "" {
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return fmt.Errorf("missing required field: index")
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}
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return nil
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}
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// Source returns the JSON-serializable data.
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func (a *AliasRemoveIndexAction) Source() (interface{}, error) {
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if err := a.Validate(); err != nil {
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return nil, err
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}
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src := make(map[string]interface{})
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act := make(map[string]interface{})
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src["remove_index"] = act
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act["index"] = a.index
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return src, nil
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}
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// -- Service --
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// AliasService enables users to add or remove an alias.
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// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/indices-aliases.html
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// for details.
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type AliasService struct {
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client *Client
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pretty *bool // pretty format the returned JSON response
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human *bool // return human readable values for statistics
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errorTrace *bool // include the stack trace of returned errors
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filterPath []string // list of filters used to reduce the response
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headers http.Header // custom request-level HTTP headers
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actions []AliasAction
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}
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// NewAliasService implements a service to manage aliases.
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func NewAliasService(client *Client) *AliasService {
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builder := &AliasService{
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client: client,
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}
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return builder
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}
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// Pretty tells Elasticsearch whether to return a formatted JSON response.
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func (s *AliasService) Pretty(pretty bool) *AliasService {
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s.pretty = &pretty
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return s
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}
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// Human specifies whether human readable values should be returned in
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// the JSON response, e.g. "7.5mb".
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func (s *AliasService) Human(human bool) *AliasService {
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s.human = &human
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return s
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}
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// ErrorTrace specifies whether to include the stack trace of returned errors.
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func (s *AliasService) ErrorTrace(errorTrace bool) *AliasService {
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s.errorTrace = &errorTrace
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return s
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}
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// FilterPath specifies a list of filters used to reduce the response.
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func (s *AliasService) FilterPath(filterPath ...string) *AliasService {
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s.filterPath = filterPath
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return s
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}
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// Header adds a header to the request.
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func (s *AliasService) Header(name string, value string) *AliasService {
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if s.headers == nil {
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s.headers = http.Header{}
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}
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s.headers.Add(name, value)
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return s
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}
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// Headers specifies the headers of the request.
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func (s *AliasService) Headers(headers http.Header) *AliasService {
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s.headers = headers
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return s
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}
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// Add adds an alias to an index.
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func (s *AliasService) Add(indexName string, aliasName string) *AliasService {
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action := NewAliasAddAction(aliasName).Index(indexName)
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s.actions = append(s.actions, action)
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return s
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}
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// Add adds an alias to an index and associates a filter to the alias.
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func (s *AliasService) AddWithFilter(indexName string, aliasName string, filter Query) *AliasService {
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action := NewAliasAddAction(aliasName).Index(indexName).Filter(filter)
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s.actions = append(s.actions, action)
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return s
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}
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// Remove removes an alias.
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func (s *AliasService) Remove(indexName string, aliasName string) *AliasService {
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action := NewAliasRemoveAction(aliasName).Index(indexName)
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s.actions = append(s.actions, action)
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return s
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}
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// Action accepts one or more AliasAction instances which can be
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// of type AliasAddAction or AliasRemoveAction.
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func (s *AliasService) Action(action ...AliasAction) *AliasService {
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s.actions = append(s.actions, action...)
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return s
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}
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// buildURL builds the URL for the operation.
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func (s *AliasService) buildURL() (string, url.Values, error) {
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path := "/_aliases"
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// Add query string parameters
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params := url.Values{}
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if v := s.pretty; v != nil {
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params.Set("pretty", fmt.Sprint(*v))
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}
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if v := s.human; v != nil {
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params.Set("human", fmt.Sprint(*v))
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}
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if v := s.errorTrace; v != nil {
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params.Set("error_trace", fmt.Sprint(*v))
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}
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if len(s.filterPath) > 0 {
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params.Set("filter_path", strings.Join(s.filterPath, ","))
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}
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return path, params, nil
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}
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// Do executes the command.
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func (s *AliasService) Do(ctx context.Context) (*AliasResult, error) {
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path, params, err := s.buildURL()
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if err != nil {
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return nil, err
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}
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// Body with actions
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body := make(map[string]interface{})
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var actions []interface{}
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for _, action := range s.actions {
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src, err := action.Source()
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if err != nil {
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return nil, err
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}
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actions = append(actions, src)
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}
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body["actions"] = actions
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// Get response
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res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
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Method: "POST",
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Path: path,
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Params: params,
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Body: body,
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Headers: s.headers,
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})
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if err != nil {
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return nil, err
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}
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// Return results
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ret := new(AliasResult)
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if err := s.client.decoder.Decode(res.Body, ret); err != nil {
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return nil, err
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}
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return ret, nil
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}
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// -- Result of an alias request.
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// AliasResult is the outcome of calling Do on AliasService.
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type AliasResult struct {
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Acknowledged bool `json:"acknowledged"`
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ShardsAcknowledged bool `json:"shards_acknowledged"`
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Index string `json:"index,omitempty"`
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}
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