Prevent open/load/save while another is running

Makes it so that pressing "Open device", "Load from device", "Save to
device" buttons on the configuration website does nothing if another
operation is still running.

config-tool-web/code.js

@@ -148,6 +148,7 @@ let monitor_min_val = {};
 let monitor_max_val = {};
 let unique_id_counter = 0;
 let save_to_device_checkmark_timeout_id = null;
+let busy = false;
 const ignored_usages = new Set([
 ]);
 
@@ -198,39 +199,57 @@ document.addEventListener("DOMContentLoaded", function () {
 });
 
 async function open_device() {
+    if (busy) {
+        return;
+    }
+    busy = true;
+
     clear_error();
     let success = false;
-    const devices = await navigator.hid.requestDevice({
-        filters: [{ usagePage: 0xFF00, usage: 0x0020 }]
-    }).catch((err) => { display_error(err); });
-    const config_interface = devices?.find(d => d.collections.some(c => c.usagePage == 0xff00));
-    if (config_interface !== undefined) {
-        device = config_interface;
-        if (!device.opened) {
-            await device.open().catch((err) => { display_error(err + "\nIf you're on Linux, you might need to give yourself permissions to the appropriate /dev/hidraw* device."); });
-        }
-        success = device.opened;
-        success &&= await check_device_version();
-        if (success) {
-            device.addEventListener('inputreport', input_report_received);
-            await set_monitor_enabled(monitor_enabled);
-            await get_usages_from_device();
-            setup_usages_modals();
-            bluetooth_buttons_set_visibility(device.productName.includes("Bluetooth"));
+
+    try {
+        const devices = await navigator.hid.requestDevice({
+            filters: [{ usagePage: 0xFF00, usage: 0x0020 }]
+        });
+        const config_interface = devices?.find(d => d.collections.some(c => c.usagePage == 0xff00));
+        if (config_interface !== undefined) {
+            device = config_interface;
+            if (!device.opened) {
+                await device.open().catch((err) => { display_error(err + "\nIf you're on Linux, you might need to give yourself permissions to the appropriate /dev/hidraw* device."); });
+            }
+            success = device.opened;
+            success &&= await check_device_version();
+            if (success) {
+                device.addEventListener('inputreport', input_report_received);
+                await set_monitor_enabled(monitor_enabled);
+                await get_usages_from_device();
+                setup_usages_modals();
+                bluetooth_buttons_set_visibility(device.productName.includes("Bluetooth"));
+            }
         }
+    } catch (e) {
+        display_error(e);
     }
 
     device_buttons_set_disabled_state(!success);
 
     if (!success) {
         device = null;
     }
+
+    busy = false;
 }
 
 async function load_from_device() {
     if (device == null) {
         return;
     }
+
+    if (busy) {
+        return;
+    }
+    busy = true;
+
     clear_error();
 
     document.getElementById('load_from_device').disabled = true;
@@ -362,12 +381,20 @@ async function load_from_device() {
     if (device != null) {
         document.getElementById('load_from_device').disabled = false;
     }
+
+    busy = false;
 }
 
 async function save_to_device() {
     if (device == null) {
         return;
     }
+
+    if (busy) {
+        return;
+    }
+    busy = true;
+
     clear_error();
 
     document.getElementById('save_to_device').disabled = true;
@@ -497,6 +524,8 @@ async function save_to_device() {
     if (device != null) {
         document.getElementById('save_to_device').disabled = false;
     }
+
+    busy = false;
 }
 
 async function do_get_usages_from_device(command, rle_count) {
@@ -528,19 +557,15 @@ async function do_get_usages_from_device(command, rle_count) {
 }
 
 async function get_usages_from_device() {
-    try {
-        await send_feature_command(GET_CONFIG);
-        const [config_version, flags, unmapped_passthrough_layer_mask, partial_scroll_timeout, mapping_count, our_usage_count, their_usage_count, interval_override, tap_hold_threshold, gpio_debounce_time_ms, our_descriptor_number, macro_entry_duration, quirk_count] =
-            await read_config_feature([UINT8, UINT8, UINT8, UINT32, UINT16, UINT32, UINT32, UINT8, UINT32, UINT8, UINT8, UINT8, UINT16]);
-        check_received_version(config_version);
-
-        extra_usages['target'] =
-            await do_get_usages_from_device(GET_OUR_USAGES, our_usage_count);
-        extra_usages['source'] =
-            await do_get_usages_from_device(GET_THEIR_USAGES, their_usage_count);
-    } catch (e) {
-        display_error(e);
-    }
+    await send_feature_command(GET_CONFIG);
+    const [config_version, flags, unmapped_passthrough_layer_mask, partial_scroll_timeout, mapping_count, our_usage_count, their_usage_count, interval_override, tap_hold_threshold, gpio_debounce_time_ms, our_descriptor_number, macro_entry_duration, quirk_count] =
+        await read_config_feature([UINT8, UINT8, UINT8, UINT32, UINT16, UINT32, UINT32, UINT8, UINT32, UINT8, UINT8, UINT8, UINT16]);
+    check_received_version(config_version);
+
+    extra_usages['target'] =
+        await do_get_usages_from_device(GET_OUR_USAGES, our_usage_count);
+    extra_usages['source'] =
+        await do_get_usages_from_device(GET_THEIR_USAGES, their_usage_count);
 }
 
 function set_config_ui_state() {