forked from juju/juju
-
Notifications
You must be signed in to change notification settings - Fork 0
/
opfactory.go
172 lines (151 loc) · 5.1 KB
/
opfactory.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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package resolver
import (
"github.com/juju/errors"
"github.com/juju/loggo"
"gopkg.in/juju/charm.v6-unstable"
"gopkg.in/juju/charm.v6-unstable/hooks"
"github.com/juju/juju/worker/uniter/hook"
"github.com/juju/juju/worker/uniter/operation"
"github.com/juju/juju/worker/uniter/remotestate"
)
var logger = loggo.GetLogger("juju.worker.uniter.resolver")
// resolverOpFactory wraps an operation.Factory such that skips that affect
// local state will, when committed, update the embedded LocalState struct
// to reflect the change made by the operation.
//
// The wrapped operations embed information specific to the remote state
// snapshot that was used to create the operation. Thus, remote state changes
// observed between the time the operation was created and committed do not
// affect the operation; and the local state change will not prevent further
// operations from being enqueued to achieve the new remote state.
type resolverOpFactory struct {
operation.Factory
LocalState *LocalState
RemoteState remotestate.Snapshot
}
func (s *resolverOpFactory) NewRunHook(info hook.Info) (operation.Operation, error) {
op, err := s.Factory.NewRunHook(info)
if err != nil {
return nil, errors.Trace(err)
}
return s.wrapHookOp(op, info), nil
}
func (s *resolverOpFactory) NewSkipHook(info hook.Info) (operation.Operation, error) {
op, err := s.Factory.NewSkipHook(info)
if err != nil {
return nil, errors.Trace(err)
}
return s.wrapHookOp(op, info), nil
}
func (s *resolverOpFactory) NewUpgrade(charmURL *charm.URL) (operation.Operation, error) {
op, err := s.Factory.NewUpgrade(charmURL)
if err != nil {
return nil, errors.Trace(err)
}
return s.wrapUpgradeOp(op, charmURL), nil
}
func (s *resolverOpFactory) NewRevertUpgrade(charmURL *charm.URL) (operation.Operation, error) {
op, err := s.Factory.NewRevertUpgrade(charmURL)
if err != nil {
return nil, errors.Trace(err)
}
return s.wrapUpgradeOp(op, charmURL), nil
}
func (s *resolverOpFactory) NewResolvedUpgrade(charmURL *charm.URL) (operation.Operation, error) {
op, err := s.Factory.NewResolvedUpgrade(charmURL)
if err != nil {
return nil, errors.Trace(err)
}
return s.wrapUpgradeOp(op, charmURL), nil
}
func (s *resolverOpFactory) NewAction(id string) (operation.Operation, error) {
op, err := s.Factory.NewAction(id)
if err != nil {
return nil, errors.Trace(err)
}
f := func() {
if s.LocalState.CompletedActions == nil {
s.LocalState.CompletedActions = make(map[string]struct{})
}
s.LocalState.CompletedActions[id] = struct{}{}
s.LocalState.CompletedActions = trimCompletedActions(s.RemoteState.Actions, s.LocalState.CompletedActions)
}
op = onCommitWrapper{op, f}
return op, nil
}
func trimCompletedActions(pendingActions []string, completedActions map[string]struct{}) map[string]struct{} {
newCompletedActions := map[string]struct{}{}
for _, pendingAction := range pendingActions {
if _, ok := completedActions[pendingAction]; ok {
newCompletedActions[pendingAction] = struct{}{}
}
}
return newCompletedActions
}
func (s *resolverOpFactory) wrapUpgradeOp(op operation.Operation, charmURL *charm.URL) operation.Operation {
charmModifiedVersion := s.RemoteState.CharmModifiedVersion
return onCommitWrapper{op, func() {
s.LocalState.CharmURL = charmURL
s.LocalState.Restart = true
s.LocalState.Conflicted = false
s.LocalState.CharmModifiedVersion = charmModifiedVersion
}}
}
func (s *resolverOpFactory) wrapHookOp(op operation.Operation, info hook.Info) operation.Operation {
switch info.Kind {
case hooks.ConfigChanged:
v := s.RemoteState.ConfigVersion
op = onCommitWrapper{op, func() {
s.LocalState.ConfigVersion = v
}}
case hooks.LeaderSettingsChanged:
v := s.RemoteState.LeaderSettingsVersion
op = onCommitWrapper{op, func() {
s.LocalState.LeaderSettingsVersion = v
}}
}
charmModifiedVersion := s.RemoteState.CharmModifiedVersion
updateStatusVersion := s.RemoteState.UpdateStatusVersion
op = onCommitWrapper{op, func() {
// Update UpdateStatusVersion so that the update-status
// hook only fires after the next timer.
s.LocalState.UpdateStatusVersion = updateStatusVersion
s.LocalState.CharmModifiedVersion = charmModifiedVersion
}}
retryHookVersion := s.RemoteState.RetryHookVersion
op = onPrepareWrapper{op, func() {
// Update RetryHookVersion so that we don't attempt to
// retry a hook more than once between timers signals.
//
// We need to do this in Prepare, rather than Commit,
// in case the retried hook fails.
s.LocalState.RetryHookVersion = retryHookVersion
}}
return op
}
type onCommitWrapper struct {
operation.Operation
onCommit func()
}
func (op onCommitWrapper) Commit(state operation.State) (*operation.State, error) {
st, err := op.Operation.Commit(state)
if err != nil {
return nil, err
}
op.onCommit()
return st, nil
}
type onPrepareWrapper struct {
operation.Operation
onPrepare func()
}
func (op onPrepareWrapper) Prepare(state operation.State) (*operation.State, error) {
st, err := op.Operation.Prepare(state)
if err != nil {
return nil, err
}
op.onPrepare()
return st, nil
}