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cleaner.go
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cleaner.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wrangler
import (
"fmt"
"sync"
"time"
"github.com/youtube/vitess/go/vt/concurrency"
"github.com/youtube/vitess/go/vt/topo"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"golang.org/x/net/context"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
// Cleaner remembers a list of cleanup steps to perform. Just record
// action cleanup steps, and execute them at the end in reverse
// order, with various guarantees.
type Cleaner struct {
// following members protected by lock
mu sync.Mutex
actions []cleanerActionReference
}
// cleanerActionReference is the node used by Cleaner
type cleanerActionReference struct {
name string
target string
action CleanerAction
}
// CleanerAction is the interface that clean-up actions need to implement
type CleanerAction interface {
CleanUp(context.Context, *Wrangler) error
}
// Record will add a cleaning action to the list
func (cleaner *Cleaner) Record(name, target string, action CleanerAction) {
cleaner.mu.Lock()
cleaner.actions = append(cleaner.actions, cleanerActionReference{
name: name,
target: target,
action: action,
})
cleaner.mu.Unlock()
}
type cleanUpHelper struct {
err error
}
// CleanUp will run the recorded actions.
// If an action on a target fails, it will not run the next action on
// the same target.
// We return the aggregate errors for all cleanups.
// CleanUp uses its own context, with a timeout of 5 minutes, so that clean up action will run even if the original context times out.
// TODO(alainjobart) Actions should run concurrently on a per target
// basis. They are then serialized on each target.
func (cleaner *Cleaner) CleanUp(wr *Wrangler) error {
// we use a background context so we're not dependent on the original context timeout
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
actionMap := make(map[string]*cleanUpHelper)
rec := concurrency.AllErrorRecorder{}
cleaner.mu.Lock()
for i := len(cleaner.actions) - 1; i >= 0; i-- {
actionReference := cleaner.actions[i]
helper, ok := actionMap[actionReference.target]
if !ok {
helper = &cleanUpHelper{
err: nil,
}
actionMap[actionReference.target] = helper
}
if helper.err != nil {
wr.Logger().Warningf("previous action failed on target %v, no running %v", actionReference.target, actionReference.name)
continue
}
err := actionReference.action.CleanUp(ctx, wr)
if err != nil {
helper.err = err
rec.RecordError(err)
wr.Logger().Errorf("action %v failed on %v: %v", actionReference.name, actionReference.target, err)
} else {
wr.Logger().Infof("action %v successful on %v", actionReference.name, actionReference.target)
}
}
cleaner.mu.Unlock()
cancel()
return rec.Error()
}
// GetActionByName returns the first action in the list with the given
// name and target
func (cleaner *Cleaner) GetActionByName(name, target string) (CleanerAction, error) {
cleaner.mu.Lock()
defer cleaner.mu.Unlock()
for _, action := range cleaner.actions {
if action.name == name && action.target == target {
return action.action, nil
}
}
return nil, topo.ErrNoNode
}
// RemoveActionByName removes an action from the cleaner list
func (cleaner *Cleaner) RemoveActionByName(name, target string) error {
cleaner.mu.Lock()
defer cleaner.mu.Unlock()
for i, action := range cleaner.actions {
if action.name == name && action.target == target {
newActions := make([]cleanerActionReference, 0, len(cleaner.actions)-1)
if i > 0 {
newActions = append(newActions, cleaner.actions[0:i]...)
}
if i < len(cleaner.actions)-1 {
newActions = append(newActions, cleaner.actions[i+1:len(cleaner.actions)]...)
}
cleaner.actions = newActions
return nil
}
}
return topo.ErrNoNode
}
//
// ChangeSlaveTypeAction CleanerAction
//
// ChangeSlaveTypeAction will change a server type to another type
type ChangeSlaveTypeAction struct {
TabletAlias *pb.TabletAlias
TabletType pb.TabletType
}
// ChangeSlaveTypeActionName is the name of the action to change a slave type
// (can be used to find such an action by name)
const ChangeSlaveTypeActionName = "ChangeSlaveTypeAction"
// RecordChangeSlaveTypeAction records a new ChangeSlaveTypeAction
// into the specified Cleaner
func RecordChangeSlaveTypeAction(cleaner *Cleaner, tabletAlias *pb.TabletAlias, tabletType pb.TabletType) {
cleaner.Record(ChangeSlaveTypeActionName, topoproto.TabletAliasString(tabletAlias), &ChangeSlaveTypeAction{
TabletAlias: tabletAlias,
TabletType: tabletType,
})
}
// FindChangeSlaveTypeActionByTarget finds the first action for the target
func FindChangeSlaveTypeActionByTarget(cleaner *Cleaner, tabletAlias *pb.TabletAlias) (*ChangeSlaveTypeAction, error) {
action, err := cleaner.GetActionByName(ChangeSlaveTypeActionName, topoproto.TabletAliasString(tabletAlias))
if err != nil {
return nil, err
}
result, ok := action.(*ChangeSlaveTypeAction)
if !ok {
return nil, fmt.Errorf("Action with wrong type: %v", action)
}
return result, nil
}
// CleanUp is part of CleanerAction interface.
func (csta ChangeSlaveTypeAction) CleanUp(ctx context.Context, wr *Wrangler) error {
return wr.ChangeType(ctx, csta.TabletAlias, csta.TabletType, false)
}
//
// TabletTagAction CleanerAction
//
// TabletTagAction will add / remove a tag to a tablet. If Value is
// empty, will remove the tag.
type TabletTagAction struct {
TabletAlias *pb.TabletAlias
Name string
Value string
}
// TabletTagActionName is the name of the Tag action
const TabletTagActionName = "TabletTagAction"
// RecordTabletTagAction records a new TabletTagAction
// into the specified Cleaner
func RecordTabletTagAction(cleaner *Cleaner, tabletAlias *pb.TabletAlias, name, value string) {
cleaner.Record(TabletTagActionName, topoproto.TabletAliasString(tabletAlias), &TabletTagAction{
TabletAlias: tabletAlias,
Name: name,
Value: value,
})
}
// CleanUp is part of CleanerAction interface.
func (tta TabletTagAction) CleanUp(ctx context.Context, wr *Wrangler) error {
return wr.TopoServer().UpdateTabletFields(ctx, tta.TabletAlias, func(tablet *pb.Tablet) error {
if tablet.Tags == nil {
tablet.Tags = make(map[string]string)
}
if tta.Value != "" {
tablet.Tags[tta.Name] = tta.Value
} else {
delete(tablet.Tags, tta.Name)
}
return nil
})
}
//
// StartSlaveAction CleanerAction
//
// StartSlaveAction will restart binlog replication on a server
type StartSlaveAction struct {
TabletInfo *topo.TabletInfo
}
// StartSlaveActionName is the name of the slave start action
const StartSlaveActionName = "StartSlaveAction"
// RecordStartSlaveAction records a new StartSlaveAction
// into the specified Cleaner
func RecordStartSlaveAction(cleaner *Cleaner, tabletInfo *topo.TabletInfo) {
cleaner.Record(StartSlaveActionName, topoproto.TabletAliasString(tabletInfo.Alias), &StartSlaveAction{
TabletInfo: tabletInfo,
})
}
// CleanUp is part of CleanerAction interface.
func (sba StartSlaveAction) CleanUp(ctx context.Context, wr *Wrangler) error {
return wr.TabletManagerClient().StartSlave(ctx, sba.TabletInfo)
}
//
// StartBlpAction CleanerAction
//
// StartBlpAction will restart binlog replication on a server
type StartBlpAction struct {
TabletInfo *topo.TabletInfo
}
// StartBlpActionName is the name of the action to start binlog player
const StartBlpActionName = "StartBlpAction"
// RecordStartBlpAction records a new StartBlpAction
// into the specified Cleaner
func RecordStartBlpAction(cleaner *Cleaner, tabletInfo *topo.TabletInfo) {
cleaner.Record(StartBlpActionName, topoproto.TabletAliasString(tabletInfo.Alias), &StartBlpAction{
TabletInfo: tabletInfo,
})
}
// CleanUp is part of CleanerAction interface.
func (sba StartBlpAction) CleanUp(ctx context.Context, wr *Wrangler) error {
return wr.TabletManagerClient().StartBlp(ctx, sba.TabletInfo)
}