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manifold.go
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manifold.go
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// Copyright 2018 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package raftbackstop
import (
"github.com/hashicorp/raft"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/pubsub/v2"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/DavinZhang/juju/agent"
)
// ManifoldConfig holds the information necessary to run a worker for
// maintaining the raft backstop configuration in a dependency.Engine.
type ManifoldConfig struct {
RaftName string
CentralHubName string
AgentName string
Logger loggo.Logger
NewWorker func(Config) (worker.Worker, error)
}
func (config ManifoldConfig) start(context dependency.Context) (worker.Worker, error) {
var r *raft.Raft
if err := context.Get(config.RaftName, &r); err != nil {
return nil, errors.Trace(err)
}
var logStore raft.LogStore
if err := context.Get(config.RaftName, &logStore); err != nil {
return nil, errors.Trace(err)
}
var hub *pubsub.StructuredHub
if err := context.Get(config.CentralHubName, &hub); err != nil {
return nil, errors.Trace(err)
}
var agent agent.Agent
if err := context.Get(config.AgentName, &agent); err != nil {
return nil, errors.Trace(err)
}
return config.NewWorker(Config{
Raft: r,
LogStore: logStore,
Hub: hub,
Logger: config.Logger,
LocalID: raft.ServerID(agent.CurrentConfig().Tag().Id()),
})
}
// Manifold returns a dependency.Manifold for running a raftbackstop
// worker.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.RaftName,
config.CentralHubName,
config.AgentName,
},
Start: config.start,
}
}