/
manifold.go
83 lines (72 loc) · 2.03 KB
/
manifold.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package pubsub
import (
"github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/pubsub/v2"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
coreagent "github.com/juju/juju/agent"
)
// Logger represents the logging methods called.
type Logger interface {
Errorf(message string, args ...interface{})
Infof(message string, args ...interface{})
Debugf(message string, args ...interface{})
Tracef(message string, args ...interface{})
}
// ManifoldConfig defines the names of the manifolds on which a Manifold will
// depend.
type ManifoldConfig struct {
AgentName string
CentralHubName string
Clock clock.Clock
Reporter Reporter
Logger Logger
NewWorker func(WorkerConfig) (worker.Worker, error)
}
// Manifold returns a dependency manifold that runs a pubsub
// worker, using the resource names defined in the supplied config.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.AgentName,
config.CentralHubName,
},
Start: func(context dependency.Context) (worker.Worker, error) {
// Get the agent.
var agent coreagent.Agent
if err := context.Get(config.AgentName, &agent); err != nil {
return nil, err
}
agentConfig := agent.CurrentConfig()
// Get the hub.
var hub *pubsub.StructuredHub
if err := context.Get(config.CentralHubName, &hub); err != nil {
return nil, err
}
apiInfo, ready := agentConfig.APIInfo()
if !ready {
return nil, dependency.ErrMissing
}
cfg := WorkerConfig{
Origin: agentConfig.Tag().String(),
Clock: config.Clock,
Hub: hub,
APIInfo: apiInfo,
NewWriter: NewMessageWriter,
NewRemote: NewRemoteServer,
Logger: config.Logger,
}
w, err := config.NewWorker(cfg)
if err != nil {
return nil, errors.Trace(err)
}
if r, ok := config.Reporter.(*reporter); ok {
r.setWorker(w)
}
return w, nil
},
}
}