-
Notifications
You must be signed in to change notification settings - Fork 28
/
cfsm.go
173 lines (157 loc) · 4.05 KB
/
cfsm.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
173
package sesstype
import (
"fmt"
"io"
"log"
"github.com/nickng/cfsm"
)
// STOP is the 'close' message.
const STOP = "STOP"
// CFSMs captures a CFSM system syserated from a Session.
type CFSMs struct {
Sys *cfsm.System
Chans map[Role]*cfsm.CFSM
Roles map[Role]*cfsm.CFSM
States map[*cfsm.CFSM]map[string]*cfsm.State
}
func NewCFSMs(s *Session) *CFSMs {
sys := &CFSMs{
Sys: cfsm.NewSystem(),
Chans: make(map[Role]*cfsm.CFSM),
Roles: make(map[Role]*cfsm.CFSM),
States: make(map[*cfsm.CFSM]map[string]*cfsm.State),
}
for _, c := range s.Chans {
m := sys.Sys.NewMachine()
m.Comment = c.Name()
sys.Chans[c] = m
defer sys.chanToMachine(c, c.Type().String(), m)
}
for role, root := range s.Types {
m := sys.Sys.NewMachine()
m.Comment = role.Name()
sys.Roles[role] = m
sys.States[m] = make(map[string]*cfsm.State)
sys.rootToMachine(role, root, m)
if m.IsEmpty() {
log.Println("Machine", m.ID, "is empty")
sys.Sys.RemoveMachine(m.ID)
delete(sys.Roles, role)
delete(sys.States, m)
}
}
return sys
}
// WriteTo implementers io.WriterTo interface.
func (sys *CFSMs) WriteTo(w io.Writer) (int64, error) {
n, err := w.Write([]byte(sys.Sys.String()))
return int64(n), err
}
// PrintSummary shows the statistics of the CFSM syseration.
func (sys *CFSMs) PrintSummary() {
fmt.Printf("Total of %d CFSMs (%d are channels)\n",
len(sys.Roles)+len(sys.Chans), len(sys.Chans))
for r, m := range sys.Chans {
fmt.Printf("\t%d\t= %s (channel)\n", m.ID, r.Name())
}
for r, m := range sys.Roles {
fmt.Printf("\t%d\t= %s\n", m.ID, r.Name())
}
}
func (sys *CFSMs) rootToMachine(role Role, root Node, m *cfsm.CFSM) {
q0 := m.NewState()
sys.nodeToMachine(role, root, q0, m)
m.Start = q0
}
func (sys *CFSMs) nodeToMachine(role Role, node Node, q0 *cfsm.State, m *cfsm.CFSM) {
switch node := node.(type) {
case *SendNode:
to, ok := sys.Chans[node.To()]
if !ok {
log.Fatal("Cannot Send to unknown channel", node.To().Name())
}
tr := cfsm.NewSend(to, node.To().Type().String())
qSent := m.NewState()
for _, c := range node.Children() {
sys.nodeToMachine(role, c, qSent, m)
}
tr.SetNext(qSent)
q0.AddTransition(tr)
case *RecvNode:
from, ok := sys.Chans[node.From()]
if !ok {
log.Fatal("Cannot Recv from unknown channel", node.From().Name())
}
msg := node.From().Type().String()
if node.Stop() {
msg = STOP
}
tr := cfsm.NewRecv(from, msg)
qRcvd := m.NewState()
for _, c := range node.Children() {
sys.nodeToMachine(role, c, qRcvd, m)
}
tr.SetNext(qRcvd)
q0.AddTransition(tr)
case *EndNode:
ch, ok := sys.Chans[node.Chan()]
if !ok {
log.Fatal("Cannot Close unknown channel", node.Chan().Name())
}
tr := cfsm.NewSend(ch, STOP)
qEnd := m.NewState()
for _, c := range node.Children() {
sys.nodeToMachine(role, c, qEnd, m)
}
tr.SetNext(qEnd)
q0.AddTransition(tr)
case *NewChanNode, *EmptyBodyNode: // Skip
for _, c := range node.Children() {
sys.nodeToMachine(role, c, q0, m)
}
case *LabelNode:
sys.States[m][node.Name()] = q0
for _, c := range node.Children() {
sys.nodeToMachine(role, c, q0, m)
}
case *GotoNode:
qTarget := sys.States[m][node.Name()]
for _, c := range node.Children() {
sys.nodeToMachine(role, c, qTarget, m)
}
default:
log.Fatalf("Unhandled node type %T", node)
}
}
func (sys *CFSMs) chanToMachine(ch Role, T string, m *cfsm.CFSM) {
q0 := m.NewState()
qEnd := m.NewState()
for _, machine := range sys.Roles {
q1 := m.NewState()
// q0 -- Recv --> q1
tr0 := cfsm.NewRecv(machine, T)
tr0.SetNext(q1)
q0.AddTransition(tr0)
// q1 -- Send --> q0
for _, machine2 := range sys.Roles {
if machine.ID != machine2.ID {
tr1 := cfsm.NewSend(machine2, T)
tr1.SetNext(q0)
q1.AddTransition(tr1)
}
}
// q0 -- STOP --> qEnd (same qEnd)
tr2 := cfsm.NewRecv(machine, STOP)
tr2.SetNext(qEnd)
qEnd.AddTransition(tr2)
// qEnd -- STOP --> qEnd
for _, machine2 := range sys.Roles {
if machine.ID != machine2.ID {
tr3 := cfsm.NewSend(machine2, STOP)
tr3.SetNext(qEnd)
qEnd.AddTransition(tr3)
}
}
}
m.Start = q0
}