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-rw-r--r--gui/backend.go302
1 files changed, 14 insertions, 288 deletions
diff --git a/gui/backend.go b/gui/backend.go
index cf7c0fb..9c65025 100644
--- a/gui/backend.go
+++ b/gui/backend.go
@@ -1,333 +1,59 @@
package main
-/* a wrapper around bitmask that exposes status to a QtQml gui */
+/* a wrapper around bitmask that exposes status to a QtQml gui.
+ Have a look at the pkg/backend module for further enlightment. */
import (
- "bytes"
- "encoding/json"
- "fmt"
- "log"
- "net/http"
- "os"
- "reflect"
- "sync"
- //"time"
+ "C"
"unsafe"
- "0xacab.org/leap/bitmask-vpn/pkg/bitmask"
- "0xacab.org/leap/bitmask-vpn/pkg/pickle"
+ "0xacab.org/leap/bitmask-vpn/pkg/backend"
)
-// typedef void (*cb)();
-// inline void _do_callback(cb f) {
-// f();
-// }
-import "C"
-
-/* callbacks into C-land */
-
-var mut sync.Mutex
-var stmut sync.Mutex
-var cbs = make(map[string](*[0]byte))
-var initOnce sync.Once
-
-// Events are just a enumeration of all the posible events that C functions can
-// be interested in subscribing to. You cannot subscribe to an event that is
-// not listed here.
-type Events struct {
- OnStatusChanged string
-}
-
-const OnStatusChanged string = "OnStatusChanged"
-
-// subscribe registers a callback from C-land.
-// This callback needs to be passed as a void* C function pointer.
-func subscribe(event string, fp unsafe.Pointer) {
- mut.Lock()
- defer mut.Unlock()
- e := &Events{}
- v := reflect.Indirect(reflect.ValueOf(&e))
- hf := v.Elem().FieldByName(event)
- if reflect.ValueOf(hf).IsZero() {
- fmt.Println("ERROR: not a valid event:", event)
- } else {
- cbs[event] = (*[0]byte)(fp)
- }
-}
-
-// trigger fires a callback from C-land.
-func trigger(event string) {
- mut.Lock()
- defer mut.Unlock()
- cb := cbs[event]
- if cb != nil {
- C._do_callback(cb)
- } else {
- fmt.Println("ERROR: this event does not have subscribers:", event)
- }
-}
-
-/* connection status */
-
-const (
- offStr = "off"
- startingStr = "starting"
- onStr = "on"
- stoppingStr = "stopping"
- failedStr = "failed"
-)
-
-// status reflects the current VPN status. Go code is responsible for updating
-// it; C-land 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
- }
-}
-
-// 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"`
- Donate bool `json:"donate"`
- Status status `json:"status"`
- bm bitmask.Bitmask
-}
-
-func (c connectionCtx) toJson() ([]byte, error) {
- stmut.Lock()
- defer stmut.Unlock()
- b, err := json.Marshal(c)
- if err != nil {
- log.Println(err)
- return nil, err
- }
- return b, nil
-}
-
-func (c connectionCtx) updateStatus() {
- 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)
- }
- }
-}
-
-var ctx *connectionCtx
-
-func setStatus(st status) {
- stmut.Lock()
- defer stmut.Unlock()
- ctx.Status = st
- go trigger(OnStatusChanged)
-}
-
-func toggleDonate() {
- stmut.Lock()
- defer stmut.Unlock()
- ctx.Donate = !ctx.Donate
- go trigger(OnStatusChanged)
-}
-
-func setStatusFromStr(stStr string) {
- setStatus(unknown.fromString(stStr))
-}
-
-// initializeBitmask instantiates a bitmask connection
-func initializeBitmask() {
- if ctx == nil {
- log.Println("error: cannot initialize bitmask, ctx is nil")
- os.Exit(1)
- }
- bitmask.InitializeLogger()
-
- b, err := bitmask.InitializeBitmask()
- if err != nil {
- log.Println("error: cannot initialize bitmask")
- }
- ctx.bm = b
-}
-
-func startVPN() {
- err := ctx.bm.StartVPN(ctx.Provider)
- if err != nil {
- log.Println(err)
- os.Exit(1)
- }
-}
-
-func stopVPN() {
- err := ctx.bm.StopVPN()
- if err != nil {
- log.Println(err)
- }
-}
-
-// initializeContext initializes an empty connStatus and assigns it to the
-// global ctx holder. This is expected to be called only once, so the public
-// api uses the sync.Once primitive to call this.
-func initializeContext(provider, appName string) {
- var st status = off
- ctx = &connectionCtx{
- AppName: appName,
- Provider: provider,
- Donate: false,
- Status: st,
- }
- go trigger(OnStatusChanged)
- initializeBitmask()
-}
-
-/* mock http server: easy way to mocking vpn behavior on ui interaction. This
-* should also show a good way of writing functionality tests just for the Qml
-* layer */
-
-func mockUIOn(w http.ResponseWriter, r *http.Request) {
- log.Println("changing status: on")
- setStatus(on)
-}
-
-func mockUIOff(w http.ResponseWriter, r *http.Request) {
- log.Println("changing status: off")
- setStatus(off)
-}
-
-func mockUIFailed(w http.ResponseWriter, r *http.Request) {
- log.Println("changing status: failed")
- setStatus(failed)
-}
-
-func mockUI() {
- http.HandleFunc("/on", mockUIOn)
- http.HandleFunc("/off", mockUIOff)
- http.HandleFunc("/failed", mockUIFailed)
- http.ListenAndServe(":8080", nil)
-}
-
-/*
-
- exported C api
-
-*/
-
//export SwitchOn
func SwitchOn() {
- go setStatus(starting)
- go startVPN()
+ backend.SwitchOn()
}
//export SwitchOff
func SwitchOff() {
- go setStatus(stopping)
- go stopVPN()
+ backend.SwitchOff()
}
//export Unblock
func Unblock() {
- fmt.Println("unblock... [not implemented]")
+ backend.Unblock()
}
//export Quit
func Quit() {
- if ctx.Status != off {
- go setStatus(stopping)
- stopVPN()
- }
+ backend.Quit()
+
}
//export ToggleDonate
func ToggleDonate() {
- toggleDonate()
+ backend.ToggleDonate()
}
//export SubscribeToEvent
func SubscribeToEvent(event string, f unsafe.Pointer) {
- subscribe(event, f)
+ backend.SubscribeToEvent(event, f)
}
//export InitializeBitmaskContext
func InitializeBitmaskContext() {
- pi := bitmask.GetConfiguredProvider()
-
- initOnce.Do(func() {
- initializeContext(pi.Provider, pi.AppName)
- })
- go ctx.updateStatus()
-
- /* DEBUG
- timer := time.NewTimer(time.Second * 3)
- go func() {
- <-timer.C
- fmt.Println("donate timer fired")
- toggleDonate()
- }()
- */
+ backend.InitializeBitmaskContext()
}
//export RefreshContext
func RefreshContext() *C.char {
- c, _ := ctx.toJson()
- return C.CString(string(c))
+ return (*C.char)(backend.RefreshContext())
}
//export InstallHelpers
func InstallHelpers() {
- pickle.InstallHelpers()
-}
-
-/* end of the exposed api */
-
-/* we could enable this one optionally for the qt tests */
-
-/* uncomment: export MockUIInteraction */
-func MockUIInteraction() {
- log.Println("mocking ui interaction on port 8080. \nTry 'curl localhost:8080/{on|off|failed}' to toggle status.")
- go mockUI()
+ backend.InstallHelpers()
}
func main() {}