← Back to branch summary

~nskaggs/+junk/xenial-test

« back to all changes in this revision

Viewing changes to src/github.com/juju/juju/cmd/jujud/agent/model/errors.go

  • Committer: Nicholas Skaggs
  • Date: 2016-10-24 20:56:05 UTC
  • Revision ID: nicholas.skaggs@canonical.com-20161024205605-z8lta0uvuhtxwzwl
Initi with beta15

Show diffs side-by-side

added added

removed removed

Lines of Context:
src/github.com/juju/juju/cmd/jujud/agent/model/errors.go
 
1
// Copyright 2016 Canonical Ltd.
 
2
// Licensed under the AGPLv3, see LICENCE file for details.
 
3
 
 
4
package model
 
5
 
 
6
import (
 
7
        "github.com/juju/errors"
 
8
 
 
9
        "github.com/juju/juju/worker/dependency"
 
10
        "github.com/juju/juju/worker/lifeflag"
 
11
)
 
12
 
 
13
// ErrRemoved may be returned by some worker started from Manifolds to
 
14
// indicate that the model under management no longer exists.
 
15
var ErrRemoved = errors.New("model removed")
 
16
 
 
17
// LifeFilter is used with the lifeflag manifolds -- which do not depend
 
18
// on runFlag -- to return appropriate errors for consumption by the
 
19
// enclosing dependency.Engine (and/or its IsFatal check).
 
20
func LifeFilter(err error) error {
 
21
        cause := errors.Cause(err)
 
22
        switch cause {
 
23
        case lifeflag.ErrNotFound:
 
24
                return ErrRemoved
 
25
        case lifeflag.ErrValueChanged:
 
26
                return dependency.ErrBounce
 
27
        }
 
28
        return err
 
29
}
 
30
 
 
31
// IsFatal will probably be helpful when configuring a dependency.Engine
 
32
// to run the result of Manifolds.
 
33
func IsFatal(err error) bool {
 
34
        return errors.Cause(err) == ErrRemoved
 
35
}
 
36
 
 
37
// WorstError will probably be helpful when configuring a dependency.Engine
 
38
// to run the result of Manifolds.
 
39
func WorstError(err, _ error) error {
 
40
        // Doesn't matter if there's only one fatal error.
 
41
        return err
 
42
}
 
43
 
 
44
// IgnoreErrRemoved returns nil if passed an error caused by ErrRemoved,
 
45
// and otherwise returns the original error.
 
46
func IgnoreErrRemoved(err error) error {
 
47
        cause := errors.Cause(err)
 
48
        if cause == ErrRemoved {
 
49
                return nil
 
50
        }
 
51
        return err
 
52
}