Support to get net speed

lib/data/model/server/net_speed.dart

@@ -0,0 +1,71 @@
+import 'dart:math';
+
+class NetSpeedPart {
+  String device;
+  int bytesIn;
+  int bytesOut;
+  int time;
+  NetSpeedPart(this.device, this.bytesIn, this.bytesOut, this.time);
+}
+
+class NetSpeed {
+  List<NetSpeedPart> old;
+  List<NetSpeedPart> now;
+  NetSpeed(this.old, this.now);
+
+  List<String> get devices {
+    final devices = <String>[];
+    for (var item in now) {
+      devices.add(item.device);
+    }
+    return devices;
+  }
+
+  NetSpeed update(List<NetSpeedPart> newOne) => NetSpeed(now, newOne);
+
+  int get timeDiff => now[0].time - old[0].time;
+
+  String speedIn({String? device}) {
+    if (old[0].device == '' || now[0].device == '') return '0kb/s';
+    int idx = 0;
+    if (device != null) {
+      for (var item in now) {
+        if (item.device == device) {
+          idx = now.indexOf(item);
+          break;
+        }
+      }
+    }
+    final speedInBytesPerSecond =
+        (now[idx].bytesIn - old[idx].bytesIn) / timeDiff;
+    int squareTimes = 0;
+    for (; speedInBytesPerSecond / pow(1024, squareTimes) > 1024;) {
+      if (squareTimes >= suffixs.length - 1) break;
+      squareTimes++;
+    }
+    return '${(speedInBytesPerSecond / pow(1024, squareTimes)).toStringAsFixed(1)} ${suffixs[squareTimes]}';
+  }
+
+  String speedOut({String? device}) {
+    if (old[0].device == '' || now[0].device == '') return '0kb/s';
+    int idx = 0;
+    if (device != null) {
+      for (var item in now) {
+        if (item.device == device) {
+          idx = now.indexOf(item);
+          break;
+        }
+      }
+    }
+    final speedInBytesPerSecond =
+        (now[idx].bytesOut - old[idx].bytesOut) / timeDiff;
+    int squareTimes = 0;
+    for (; speedInBytesPerSecond / pow(1024, squareTimes) > 1024;) {
+      if (squareTimes >= suffixs.length - 1) break;
+      squareTimes++;
+    }
+    return '${(speedInBytesPerSecond / pow(1024, squareTimes)).toStringAsFixed(1)} ${suffixs[squareTimes]}';
+  }
+}
+
+const suffixs = ['b/s', 'kb/s', 'mb/s', 'gb/s'];

lib/data/model/server/server_status.dart

@@ -1,5 +1,6 @@
 import 'package:toolbox/data/model/server/cpu_2_status.dart';
 import 'package:toolbox/data/model/server/disk_info.dart';
+import 'package:toolbox/data/model/server/net_speed.dart';
 import 'package:toolbox/data/model/server/tcp_status.dart';
 
 ///
@@ -28,13 +29,14 @@ class ServerStatus {
 } 
 */
 
-  late Cpu2Status cpu2Status;
+  Cpu2Status cpu2Status;
-  late List<int> memList;
+  List<int> memList;
-  late String sysVer;
+  String sysVer;
-  late String uptime;
+  String uptime;
-  late List<DiskInfo> disk;
+  List<DiskInfo> disk;
-  late TcpStatus tcp;
+  TcpStatus tcp;
+  NetSpeed netSpeed;
 
   ServerStatus(this.cpu2Status, this.memList, this.sysVer, this.uptime,
-      this.disk, this.tcp);
+      this.disk, this.tcp, this.netSpeed);
 }

lib/data/provider/server.dart

@@ -6,6 +6,7 @@ import 'package:toolbox/core/extension/stringx.dart';
 import 'package:toolbox/core/provider_base.dart';
 import 'package:toolbox/data/model/server/cpu_2_status.dart';
 import 'package:toolbox/data/model/server/cpu_status.dart';
+import 'package:toolbox/data/model/server/net_speed.dart';
 import 'package:toolbox/data/model/server/server_connection_state.dart';
 import 'package:toolbox/data/model/server/disk_info.dart';
 import 'package:toolbox/data/model/server/server.dart';
@@ -22,6 +23,11 @@ class ServerProvider extends BusyProvider {
 
   final logger = Logger('ServerProvider');
 
+  NetSpeedPart get emptyNetSpeedPart => NetSpeedPart('', 0, 0, 0);
+
+  NetSpeed get emptyNetSpeed =>
+      NetSpeed([emptyNetSpeedPart], [emptyNetSpeedPart]);
+
   CpuStatus get emptyCpuStatus => CpuStatus('cpu', 0, 0, 0, 0, 0, 0, 0);
 
   Cpu2Status get emptyCpu2Status =>
@@ -33,7 +39,8 @@ class ServerProvider extends BusyProvider {
       'Loading...',
       '',
       [DiskInfo('/', '/', 0, '0', '0', '0')],
-      TcpStatus(0, 0, 0, 0));
+      TcpStatus(0, 0, 0, 0),
+      emptyNetSpeed);
 
   Future<void> loadLocalData() async {
     setBusyState(true);
@@ -144,6 +151,8 @@ class ServerProvider extends BusyProvider {
       final upTime = await client.execute('uptime') ?? '';
       final disk = await client.execute('df -h') ?? '';
       final tcp = await client.execute('cat /proc/net/snmp') ?? '';
+      final netSpeed =
+          await client.execute('cat /proc/net/dev && date +%s') ?? '';
 
       return ServerStatus(
           _getCPU(cpu, _servers[idx].status.cpu2Status, cpuTemp),
@@ -151,7 +160,8 @@ class ServerProvider extends BusyProvider {
           _getSysVer(sysVer),
           _getUpTime(upTime),
           _getDisk(disk),
-          _getTcp(tcp));
+          _getTcp(tcp),
+          _getNetSpeed(netSpeed, _servers[idx].status.netSpeed));
     } catch (e) {
       _servers[idx].connectionState = ServerConnectionState.failed;
       notifyListeners();
@@ -160,6 +170,30 @@ class ServerProvider extends BusyProvider {
     }
   }
 
+  /// [raw] example:
+  /// Inter-|   Receive                                                |  Transmit
+  ///   face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
+  ///   lo: 45929941  269112    0    0    0     0          0         0 45929941  269112    0    0    0     0       0          0
+  ///   eth0: 48481023  505772    0    0    0     0          0         0 36002262  202307    0    0    0     0       0          0
+  /// 1635752901
+  NetSpeed _getNetSpeed(String raw, NetSpeed old) {
+    final split = raw.split('\n');
+    final deviceCount = split.length - 3;
+    if (deviceCount < 1) return emptyNetSpeed;
+    final time = int.parse(split[split.length - 2]);
+    final results = <NetSpeedPart>[];
+    for (int idx = 2; idx < deviceCount; idx++) {
+      final data = split[idx].trim().split(':');
+      final device = data.first;
+      final bytes = data.last.trim().split(' ');
+      bytes.removeWhere((element) => element == '');
+      final bytesIn = int.parse(bytes.first);
+      final bytesOut = int.parse(bytes[8]);
+      results.add(NetSpeedPart(device, bytesIn, bytesOut, time));
+    }
+    return old.update(results);
+  }
+
   String _getSysVer(String raw) {
     final s = raw.split('=');
     if (s.length == 2) {

lib/view/page/server/detail.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'package:toolbox/data/model/server/net_speed.dart';
 import 'package:toolbox/data/model/server/server.dart';
 import 'package:toolbox/data/model/server/server_status.dart';
 import 'package:toolbox/data/provider/server.dart';
@@ -47,7 +48,8 @@ class _ServerDetailPageState extends State<ServerDetailPage>
           _buildUpTimeAndSys(si.status),
           _buildCPUView(si.status),
           _buildDiskView(si.status),
-          _buildMemView(si.status)
+          _buildMemView(si.status),
+          _buildNetView(si.status.netSpeed)
         ],
       ),
     );
@@ -264,6 +266,10 @@ class _ServerDetailPageState extends State<ServerDetailPage>
     ));
   }
 
+  Widget _buildNetView(NetSpeed ns) {
+    return Text(ns.speedIn() + '' + ns.speedOut());
+  }
+
   static const ignorePath = [
     '/run',
     '/sys',