/
startupmanifold.go
68 lines (60 loc) · 1.8 KB
/
startupmanifold.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
// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package machine
import (
"github.com/juju/errors"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/dependency"
"github.com/juju/juju/api"
)
// Logger represents the logging methods used by this manifold.
type Logger interface {
Debugf(string, ...interface{})
Warningf(string, ...interface{})
Criticalf(string, ...interface{})
Tracef(string, ...interface{})
}
// MachineStartupConfig provides the dependencies for the
// machinestartup manifold.
type MachineStartupConfig struct {
APICallerName string
MachineStartup func(api.Connection, Logger) error
Logger Logger
}
func (c MachineStartupConfig) Validate() error {
if c.APICallerName == "" {
return errors.NotValidf("missing API Caller name")
}
if c.MachineStartup == nil {
return errors.NotValidf("missing MachineStartup")
}
if c.Logger == nil {
return errors.NotValidf("missing Logger")
}
return nil
}
// MachineStartupManifold starts a worker that rely on an API connection
// to complete machine setup.
func MachineStartupManifold(config MachineStartupConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.APICallerName,
},
Start: func(context dependency.Context) (worker.Worker, error) {
if err := config.Validate(); err != nil {
return nil, err
}
config.Logger.Debugf("Starting machine setup requiring an API connection")
// Get API connection.
var apiConn api.Connection
if err := context.Get(config.APICallerName, &apiConn); err != nil {
return nil, err
}
if err := config.MachineStartup(apiConn, config.Logger); err != nil {
return nil, err
}
config.Logger.Debugf("Finished machine setup requiring an API connection")
return nil, dependency.ErrUninstall
},
}
}