Client + Discovery: Fetch dscovery at startup using DiscoveryStartup

With a manager that locks and copies such that no race conditions happen

1 files changed, 27 insertions, 0 deletions

diff --git a/exports/exports.go b/exports/exports.go
index 1e496f8..36372b4 100644
--- a/exports/exports.go
+++ b/exports/exports.go
@@ -21,6 +21,7 @@ typedef long long int (*ReadRxBytes)();
 
 typedef int (*StateCB)(int oldstate, int newstate, void* data);
 
+typedef void (*RefreshList)();
 typedef void (*TokenGetter)(const char* server_id, int server_type, char* out, size_t len);
 typedef void (*TokenSetter)(const char* server_id, int server_type, const char* tokens);
 typedef void (*ProxySetup)(int fd, const char* peer_ips);
@@ -34,6 +35,10 @@ static int call_callback(StateCB callback, int oldstate, int newstate, void* dat
 {
     return callback(oldstate, newstate, data);
 }
+static void call_refresh_list(RefreshList refresh)
+{
+    refresh();
+}
 static void call_token_getter(TokenGetter getter, const char* server_id, int server_type, char* out, size_t len)
 {
     getter(server_id, server_type, out, len);
@@ -1024,6 +1029,28 @@ func getCookie(c C.uintptr_t) (*cookie.Cookie, error) {
 	return v, nil
 }
 
+
+// DiscoveryStartup does a discovery request in the background
+//
+// The `refresh` argument is a callback that is called when the refreshing is done
+// When this callback is thus called, the app SHOULD refresh the server list of the already configured servers
+// This DiscoveryStartup function MUST be called after calling `Register`
+//
+//export DiscoveryStartup
+func DiscoveryStartup(refresh C.RefreshList) *C.char {
+	state, stateErr := getVPNState()
+	if stateErr != nil {
+		return getCError(stateErr)
+	}
+	state.DiscoveryStartup(func() {
+		if refresh == nil {
+			return
+		}
+		C.call_refresh_list(refresh)
+	})
+	return nil
+}
+
 // SetTokenHandler sets the token getters and token setters for OAuth
 //
 // Because the data that is saved does not contain OAuth tokens for server, the common lib asks and sets the tokens using these callback functions.