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|
package eduvpn
import (
"fmt"
"os"
"sort"
)
type (
FSMStateID int8
FSMStateIDSlice []FSMStateID
)
func (v FSMStateIDSlice) Len() int {
return len(v)
}
func (v FSMStateIDSlice) Less(i, j int) bool {
return v[i] < v[j]
}
func (v FSMStateIDSlice) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}
const (
// Deregistered means the app is not registered with the wrapper
DEREGISTERED FSMStateID = iota
// No Server means the user has not chosen a server yet
NO_SERVER
// Chosen Server means the user has chosen a server to connect to
CHOSEN_SERVER
// OAuth Started means the OAuth process has started
OAUTH_STARTED
// Authenticated means the OAuth process has finished and the user is now authenticated with the server
AUTHENTICATED
// Requested config means the user has requested a config for connecting
REQUEST_CONFIG
// Has config means the user has gotten a config
HAS_CONFIG
// Ask profile means the go code is asking for a profile selection from the ui
ASK_PROFILE
// Connected means the user has been connected to the server
CONNECTED
)
func (s FSMStateID) String() string {
switch s {
case DEREGISTERED:
return "Deregistered"
case NO_SERVER:
return "No_Server"
case CHOSEN_SERVER:
return "Chosen_Server"
case OAUTH_STARTED:
return "OAuth_Started"
case HAS_CONFIG:
return "Has_Config"
case REQUEST_CONFIG:
return "Request_Config"
case ASK_PROFILE:
return "Ask_Profile"
case AUTHENTICATED:
return "Authenticated"
case CONNECTED:
return "Connected"
default:
panic("unknown conversion of state to string")
}
}
type FSMTransition struct {
To FSMStateID
Description string
}
type (
FSMTransitions []FSMTransition
FSMStates map[FSMStateID]FSMTransitions
)
type FSM struct {
States FSMStates
Current FSMStateID
}
func (eduvpn *VPNState) HasTransition(check FSMStateID) bool {
for _, transition_state := range eduvpn.FSM.States[eduvpn.FSM.Current] {
if transition_state.To == check {
return true
}
}
return false
}
func (eduvpn *VPNState) InState(check FSMStateID) bool {
return check == eduvpn.FSM.Current
}
func (eduvpn *VPNState) writeGraph() {
graph := eduvpn.GenerateGraph()
f, err := os.Create("debug.graph")
if err != nil {
eduvpn.Log(LOG_INFO, fmt.Sprintf("Failed to write debug fsm graph with error %v", err))
}
defer f.Close()
f.WriteString(graph)
}
func (eduvpn *VPNState) GoTransitionWithData(newState FSMStateID, data string) bool {
ok := eduvpn.HasTransition(newState)
if ok {
oldState := eduvpn.FSM.Current
eduvpn.FSM.Current = newState
if eduvpn.Debug {
eduvpn.writeGraph()
}
eduvpn.StateCallback(oldState.String(), newState.String(), data)
}
return ok
}
func (eduvpn *VPNState) GoTransition(newState FSMStateID) bool {
return eduvpn.GoTransitionWithData(newState, "")
}
func (eduvpn *VPNState) generateDotGraph() string {
graph := `digraph eduvpn_fsm {
nodesep = 2;
remincross = false;
`
graph += "node[color=blue]; " + eduvpn.FSM.Current.String() + ";\n"
graph += "node [color=black];\n"
for state, transitions := range eduvpn.FSM.States {
for _, transition := range transitions {
graph += state.String() + " -> " + transition.To.String() + " [label=\"" + transition.Description + "\"]\n"
}
}
graph += "}"
return graph
}
func (eduvpn *VPNState) generateMermaidGraph() string {
graph := "graph TD\n"
sorted_fsm := make(FSMStateIDSlice, 0, len(eduvpn.FSM.States))
for state_id := range eduvpn.FSM.States {
sorted_fsm = append(sorted_fsm, state_id)
}
sort.Sort(sorted_fsm)
for _, state := range sorted_fsm {
transitions := eduvpn.FSM.States[state]
for _, transition := range transitions {
if state == eduvpn.FSM.Current {
graph += "\nstyle " + state.String() + " fill:cyan\n"
} else {
graph += "\nstyle " + state.String() + " fill:white\n"
}
graph += state.String() + "(" + state.String() + ") " + "-->|" + transition.Description + "| " + transition.To.String() + "\n"
}
}
return graph
}
func (eduvpn *VPNState) GenerateGraph() string {
return eduvpn.generateMermaidGraph()
}
func (eduvpn *VPNState) InitializeFSM() {
eduvpn.FSM = FSM{
States: FSMStates{
DEREGISTERED: {{NO_SERVER, "Client registers"}},
NO_SERVER: {{CHOSEN_SERVER, "User chooses a server"}},
CHOSEN_SERVER: {{AUTHENTICATED, "Found tokens in config"}, {OAUTH_STARTED, "No tokens found in config"}},
OAUTH_STARTED: {{AUTHENTICATED, "User authorizes with browser"}},
AUTHENTICATED: {{OAUTH_STARTED, "Re-authenticate with OAuth"}, {REQUEST_CONFIG, "Client requests a config"}},
REQUEST_CONFIG: {{ASK_PROFILE, "Multiple profiles found"}, {HAS_CONFIG, "Success, only one profile"}},
ASK_PROFILE: {{HAS_CONFIG, "User chooses profile and success"}},
HAS_CONFIG: {{CONNECTED, "OS reports connected"}},
CONNECTED: {{AUTHENTICATED, "OS reports disconnected"}},
},
Current: DEREGISTERED,
}
}
|
