From 6981666c6d8f639a1ff9c09a3bc08769e19928af Mon Sep 17 00:00:00 2001
From: jwijenbergh <jeroenwijenbergh@protonmail.com>
Date: Tue, 20 Dec 2022 15:35:44 +0100
Subject: Failover: Initial implementation

---
 exports/exports.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

(limited to 'exports')

diff --git a/exports/exports.go b/exports/exports.go
index 87ce331..e374661 100644
--- a/exports/exports.go
+++ b/exports/exports.go
@@ -4,8 +4,13 @@ package main
 #include <stdlib.h>
 #include "error.h"
 
+typedef long long int (*ReadRxBytes)();
 typedef int (*PythonCB)(const char* name, int oldstate, int newstate, void* data);
 
+static long long int get_read_rx_bytes(ReadRxBytes read)
+{
+   return read();
+}
 static int call_callback(PythonCB callback, const char *name, int oldstate, int newstate, void* data)
 {
     return callback(name, oldstate, newstate, data);
@@ -441,6 +446,44 @@ func SetSupportWireguard(name *C.char, support C.int) *C.error {
 	return nil
 }
 
+//export StartFailover
+func StartFailover(name *C.char, gateway *C.char, mtu C.int, readRxBytes C.ReadRxBytes) (C.int, *C.error) {
+	nameStr := C.GoString(name)
+	state, stateErr := GetVPNState(nameStr)
+	if stateErr != nil {
+		return C.int(0), getError(stateErr)
+	}
+	dropped, droppedErr := state.StartFailover(C.GoString(gateway), int(mtu), func() (int64, error) {
+		rxBytes := int64(C.get_read_rx_bytes(readRxBytes))
+		if rxBytes == -1 {
+			return 0, errors.New("client gave an invalid rx bytes value")
+		}
+		return rxBytes, nil
+	})
+	if droppedErr != nil {
+		return C.int(0), getError(droppedErr)
+	}
+	droppedC := C.int(0)
+	if dropped {
+		droppedC = C.int(1)
+	}
+	return droppedC, nil
+}
+
+//export CancelFailover
+func CancelFailover(name *C.char) *C.error {
+	nameStr := C.GoString(name)
+	state, stateErr := GetVPNState(nameStr)
+	if stateErr != nil {
+		return getError(stateErr)
+	}
+	cancelErr := state.CancelFailover()
+	if cancelErr != nil {
+		return getError(cancelErr)
+	}
+	return nil
+}
+
 //export FreeString
 func FreeString(addr *C.char) {
 	C.free(unsafe.Pointer(addr))
-- 
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