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wrangler.go
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wrangler.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 contains the Wrangler object to manage complex
// topology actions.
package wrangler
import (
"github.com/youtube/vitess/go/vt/logutil"
"github.com/youtube/vitess/go/vt/tabletmanager/tmclient"
"github.com/youtube/vitess/go/vt/topo"
)
var (
// DefaultActionTimeout is a good default for interactive
// remote actions. We usually take a lock then do an action,
// so basing this to be greater than DefaultLockTimeout is good.
// Use this as the default value for Context that need a deadline.
DefaultActionTimeout = topo.DefaultLockTimeout * 4
)
// Wrangler manages complex actions on the topology, like reparents,
// backups, resharding, ...
//
// Multiple go routines can use the same Wrangler at the same time,
// provided they want to share the same logger / topo server / lock timeout.
type Wrangler struct {
logger logutil.Logger
ts topo.Server
tmc tmclient.TabletManagerClient
}
// New creates a new Wrangler object.
func New(logger logutil.Logger, ts topo.Server, tmc tmclient.TabletManagerClient) *Wrangler {
return &Wrangler{
logger: logger,
ts: ts,
tmc: tmc,
}
}
// TopoServer returns the topo.Server this wrangler is using.
func (wr *Wrangler) TopoServer() topo.Server {
return wr.ts
}
// TabletManagerClient returns the tmclient.TabletManagerClient this
// wrangler is using.
func (wr *Wrangler) TabletManagerClient() tmclient.TabletManagerClient {
return wr.tmc
}
// SetLogger can be used to change the current logger. Not synchronized,
// no calls to this wrangler should be in progress.
func (wr *Wrangler) SetLogger(logger logutil.Logger) {
wr.logger = logger
}
// Logger returns the logger associated with this wrangler.
func (wr *Wrangler) Logger() logutil.Logger {
return wr.logger
}