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package backend
import (
"bytes"
"encoding/json"
"log"
"sync"
"0xacab.org/leap/bitmask-vpn/pkg/bitmask"
"0xacab.org/leap/bitmask-vpn/pkg/config"
)
const (
offStr = "off"
startingStr = "starting"
onStr = "on"
stoppingStr = "stopping"
failedStr = "failed"
)
// ctx will be our glorious global object.
// if we ever switch again to a provider-agnostic app, we should keep a map here.
var ctx *connectionCtx
// these mutexes protect setting and updating the global status in this go backend
var statusMutex sync.Mutex
var updateMutex sync.Mutex
// The connectionCtx keeps the global state that is passed around to C-land. It
// also serves as the primary way of passing requests from the frontend to the
// Go-core, by letting the UI write some of these variables and processing
// them.
type connectionCtx struct {
AppName string `json:"appName"`
Provider string `json:"provider"`
TosURL string `json:"tosURL"`
HelpURL string `json:"helpURL"`
AskForDonations bool `json:"askForDonations"`
DonateDialog bool `json:"donateDialog"`
DonateURL string `json:"donateURL"`
LoginDialog bool `json:"loginDialog"`
LoginOk bool `json:"loginOk"`
Version string `json:"version"`
Errors string `json:"errors"`
Status status `json:"status"`
Locations map[string]float64 `json:"locations"`
LocationLabels map[string][]string `json:"locationLabels"`
CurrentGateway string `json:"currentGateway"`
CurrentLocation string `json:"currentLocation"`
CurrentCountry string `json:"currentCountry"`
BestLocation string `json:"bestLocation"`
Transport string `json:"transport"`
UseUDP bool `json:"udp"`
OffersUDP bool `json:"offersUdp"`
ManualLocation bool `json:"manualLocation"`
IsReady bool `json:"isReady"`
CanUpgrade bool `json:"canUpgrade"`
Motd string `json:"motd"`
bm bitmask.Bitmask
autostart bitmask.Autostart
cfg *config.Config
}
func (c *connectionCtx) toJson() ([]byte, error) {
statusMutex.Lock()
if c.bm != nil {
transport := c.bm.GetTransport()
c.Locations = c.bm.ListLocationFullness(transport)
c.LocationLabels = c.bm.ListLocationLabels(transport)
c.CurrentGateway = c.bm.GetCurrentGateway()
c.CurrentLocation = c.bm.GetCurrentLocation()
c.CurrentCountry = c.bm.GetCurrentCountry()
c.BestLocation = c.bm.GetBestLocation(transport)
c.Transport = transport
c.UseUDP = c.cfg.UDP // TODO initialize bitmask too
c.OffersUDP = c.bm.OffersUDP()
c.ManualLocation = c.bm.IsManualLocation()
c.CanUpgrade = c.bm.CanUpgrade()
c.Motd = c.bm.GetMotd()
}
defer statusMutex.Unlock()
b, err := json.Marshal(c)
if err != nil {
log.Println(err)
return nil, err
}
return b, nil
}
func (c connectionCtx) updateStatus() {
updateMutex.Lock()
defer updateMutex.Unlock()
if stStr, err := c.bm.GetStatus(); err != nil {
log.Printf("Error getting status: %v", err)
} else {
setStatusFromStr(stStr)
}
statusCh := c.bm.GetStatusCh()
for {
select {
case stStr := <-statusCh:
setStatusFromStr(stStr)
}
}
}
func setStatus(st status) {
statusMutex.Lock()
defer statusMutex.Unlock()
ctx.Status = st
go trigger(OnStatusChanged)
}
// the status type reflects the current VPN status. Go code is responsible for updating
// it; the C gui just watches its changes and pulls its updates via the serialized
// context object.
type status int
const (
off status = iota
starting
on
stopping
failed
unknown
)
func (s status) String() string {
return [...]string{offStr, startingStr, onStr, stoppingStr, failedStr}[s]
}
func (s status) MarshalJSON() ([]byte, error) {
b := bytes.NewBufferString(`"`)
b.WriteString(s.String())
b.WriteString(`"`)
return b.Bytes(), nil
}
func (s status) fromString(st string) status {
switch st {
case offStr:
return off
case startingStr:
return starting
case onStr:
return on
case stoppingStr:
return stopping
case failedStr:
return failed
default:
return unknown
}
}
func setStatusFromStr(stStr string) {
setStatus(unknown.fromString(stStr))
}
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