forked from coreos/torus
-
Notifications
You must be signed in to change notification settings - Fork 0
/
union.go
99 lines (88 loc) · 1.92 KB
/
union.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
package ring
import (
"errors"
"fmt"
"github.com/coreos/torus"
"github.com/coreos/torus/models"
)
type unionRing struct {
oldRing torus.Ring
newRing torus.Ring
}
func init() {
registerRing(Union, "union", makeUnion)
}
func makeUnion(r *models.Ring) (torus.Ring, error) {
var err error
out := &unionRing{}
oldb, ok := r.Attrs["old"]
if !ok {
return nil, errors.New("no old ring in union ring data")
}
out.oldRing, err = Unmarshal(oldb)
if err != nil {
return nil, err
}
newb, ok := r.Attrs["new"]
if !ok {
return nil, errors.New("no new ring in union ring data")
}
out.newRing, err = Unmarshal(newb)
if err != nil {
return nil, err
}
return out, nil
}
func NewUnionRing(oldRing torus.Ring, newRing torus.Ring) torus.Ring {
return &unionRing{
oldRing: oldRing,
newRing: newRing,
}
}
func (u *unionRing) GetPeers(key torus.BlockRef) (torus.PeerPermutation, error) {
n, err := u.newRing.GetPeers(key)
if err != nil {
return torus.PeerPermutation{}, err
}
o, err := u.oldRing.GetPeers(key)
if err != nil {
return torus.PeerPermutation{}, err
}
return torus.PeerPermutation{
Peers: o.Peers.Union(n.Peers),
Replication: n.Replication,
}, nil
}
func (u *unionRing) Members() torus.PeerList {
return u.newRing.Members().Union(u.oldRing.Members())
}
func (u *unionRing) Describe() string {
return fmt.Sprintf(
"Union Ring:\nOld:\n%s\nNew:\n%s",
u.oldRing.Describe(),
u.newRing.Describe(),
)
}
func (u *unionRing) Type() torus.RingType {
return Union
}
func (u *unionRing) Version() int {
return u.newRing.Version()
}
func (u *unionRing) Marshal() ([]byte, error) {
var out models.Ring
out.Version = uint32(u.Version())
out.Type = uint32(u.Type())
out.Attrs = make(map[string][]byte)
b, err := u.oldRing.Marshal()
if err != nil {
return nil, err
}
out.Attrs["old"] = b
b, err = u.newRing.Marshal()
if err != nil {
return nil, err
}
out.Attrs["new"] = b
return out.Marshal()
}