本文共 12854 字，大约阅读时间需要 42 分钟。

这篇文章整理一下因误操作删除了某个Tab的撤销和恢复的方法。

环境准备

• Node-RED
  以容器方式启动Node-RED服务，启动命令如下所示：

启动命令：docker run -it -p 1880:1880 -v $PWD/data:/data -e TZ=Asia/Shanghai --name nodered -d nodered/node-red:1.0.4

• 执行日志示例

liumiaocn:nodered liumiao$ docker run -it -p 1880:1880 -v $PWD/data:/data -e TZ=Asia/Shanghai --name nodered -d nodered/node-red:1.0.48286e234916a7dbd320d88c2dee7c1b6d119a9803ef6e633a7b0d3f1f6ab9993liumiaocn:nodered liumiao$ docker psCONTAINER ID        IMAGE                    COMMAND                  CREATED             STATUS                             PORTS                    NAMES8286e234916a        nodered/node-red:1.0.4   "npm start -- --user…"   27 seconds ago      Up 27 seconds (health: starting)   0.0.0.0:1880->1880/tcp   noderedliumiaocn:nodered liumiao$

事前准备：示例flow

创建如下的简单flow：

[    {
           "id": "ec475e12.7b432",        "type": "inject",        "z": "73554227.4474dc",        "name": "",        "topic": "",        "payload": "",        "payloadType": "date",        "repeat": "",        "crontab": "",        "once": false,        "onceDelay": 0.1,        "x": 140,        "y": 140,        "wires": [            [                "99255b3e.062578"            ]        ]    },    {
           "id": "f1bd528c.1175",        "type": "debug",        "z": "73554227.4474dc",        "name": "",        "active": true,        "tosidebar": true,        "console": false,        "tostatus": false,        "complete": "payload",        "targetType": "msg",        "x": 530,        "y": 340,        "wires": []    },    {
           "id": "99255b3e.062578",        "type": "function",        "z": "73554227.4474dc",        "name": "时间转换",        "func": "// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;",        "outputs": 1,        "noerr": 0,        "x": 320,        "y": 240,        "wires": [            [                "f1bd528c.1175"            ]        ]    }]

具体flow如下所示：

保存位置确认

上述json导入之后，执行deploy之后，保存的位置，如果是本文使用的官方镜像的话，保存文件为/data/flows.json：

/data $ pwd/data/data $ ls -larttotal 56drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red       854 Sep  1 19:38 flows.jsondrwxr-xr-x    9 node-red node-red       288 Sep  1 19:38 ./data $ cat flows.json [{
   "id":"439fcec6.28b5e","type":"tab","label":"Flow 1","disabled":false,"info":""},{
   "id":"3b7a781d.61e6e8","type":"inject","z":"439fcec6.28b5e","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":120,"wires":[["762e7a64.734334"]]},{
   "id":"7ca09953.b7c7d8","type":"debug","z":"439fcec6.28b5e","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":570,"y":320,"wires":[]},{
   "id":"762e7a64.734334","type":"function","z":"439fcec6.28b5e","name":"时间转换","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":360,"y":220,"wires":[["7ca09953.b7c7d8"]]}]/data $ /data $

再创建一个Flow 2的tab，然后将Flow 1的内容拷贝过来，为了区分，这里将中间节点的名称修改为 时间转换2 ，其余均不变

/data $ ls -lrttotal 28-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.json/data $ cat flows.json [{
   "id":"439fcec6.28b5e","type":"tab","label":"Flow 1","disabled":false,"info":""},{
   "id":"bced581b.cdf098","type":"tab","label":"Flow 2","disabled":false,"info":""},{
   "id":"3b7a781d.61e6e8","type":"inject","z":"439fcec6.28b5e","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":120,"wires":[["762e7a64.734334"]]},{
   "id":"7ca09953.b7c7d8","type":"debug","z":"439fcec6.28b5e","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":570,"y":320,"wires":[]},{
   "id":"762e7a64.734334","type":"function","z":"439fcec6.28b5e","name":"时间转换","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":360,"y":220,"wires":[["7ca09953.b7c7d8"]]},{
   "id":"d33e6ccb.e1f4a","type":"inject","z":"bced581b.cdf098","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":160,"y":100,"wires":[["fb0063b7.9ff31"]]},{
   "id":"f3f3669e.fb2ae8","type":"debug","z":"bced581b.cdf098","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":550,"y":300,"wires":[]},{
   "id":"fb0063b7.9ff31","type":"function","z":"bced581b.cdf098","name":"时间转换2","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":350,"y":200,"wires":[["f3f3669e.fb2ae8"]]}]/data $ /data $

试验1: 删除Flow 2但并不进行Deploy

/data $ ls -lrttotal 28-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.json/data $

实际上会有一个备份文件，此处为.flows.json.backup , 可以看到，此文件目前正是我们添加Flow 2之前的内容。

/data $ ls -larttotal 60drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red       854 Sep  1 19:38 .flows.json.backup-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.jsondrwxr-xr-x   10 node-red node-red       320 Sep  1 19:43 ./data $ diff flows.json .flows.json.backup --- flows.json+++ .flows.json.backup@@ -1 +1 @@-[{
   "id":"439fcec6.28b5e","type":"tab","label":"Flow 1","disabled":false,"info":""},{
   "id":"bced581b.cdf098","type":"tab","label":"Flow 2","disabled":false,"info":""},{
   "id":"3b7a781d.61e6e8","type":"inject","z":"439fcec6.28b5e","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":120,"wires":[["762e7a64.734334"]]},{
   "id":"7ca09953.b7c7d8","type":"debug","z":"439fcec6.28b5e","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":570,"y":320,"wires":[]},{
   "id":"762e7a64.734334","type":"function","z":"439fcec6.28b5e","name":"时间转换","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":360,"y":220,"wires":[["7ca09953.b7c7d8"]]},{
   "id":"d33e6ccb.e1f4a","type":"inject","z":"bced581b.cdf098","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":160,"y":100,"wires":[["fb0063b7.9ff31"]]},{
   "id":"f3f3669e.fb2ae8","type":"debug","z":"bced581b.cdf098","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":550,"y":300,"wires":[]},{
   "id":"fb0063b7.9ff31","type":"function","z":"bced581b.cdf098","name":"时间转换2","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":350,"y":200,"wires":[["f3f3669e.fb2ae8"]]}]\ No newline at end of file+[{
   "id":"439fcec6.28b5e","type":"tab","label":"Flow 1","disabled":false,"info":""},{
   "id":"3b7a781d.61e6e8","type":"inject","z":"439fcec6.28b5e","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":180,"y":120,"wires":[["762e7a64.734334"]]},{
   "id":"7ca09953.b7c7d8","type":"debug","z":"439fcec6.28b5e","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":570,"y":320,"wires":[]},{
   "id":"762e7a64.734334","type":"function","z":"439fcec6.28b5e","name":"时间转换","func":"// 使用payload创建日期对象\nvar date = new Date(msg.payload);\n// 转换payload的时间格式\nmsg.payload = date.toString();\n// msg中的payload的格式已经转换\nreturn msg;","outputs":1,"noerr":0,"x":360,"y":220,"wires":[["7ca09953.b7c7d8"]]}]\ No newline at end of file/data $

此种场景下的恢复方法：Ctrl + Z即可恢复

试验2: 删除Flow 2同时进行Deploy

• 删除和Deploy之前

/data $ ls -larttotal 60drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red       854 Sep  1 19:38 .flows.json.backup-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.jsondrwxr-xr-x   10 node-red node-red       320 Sep  1 19:43 ./data $

• 删除并部署
  
• 确认结果: 可以看到.flows.json.backup的内容正是之前的内容

/data $ ls -larttotal 60drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 .flows.json.backup-rw-r--r--    1 node-red node-red       854 Sep  1 20:02 flows.jsondrwxr-xr-x   10 node-red node-red       320 Sep  1 20:02 ./data $

我们这里首先将其备份一下，改一个名字

/data $ cp -p .flows.json.backup flows.backup/data $ ls -larttotal 64drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.backup-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 .flows.json.backup-rw-r--r--    1 node-red node-red       854 Sep  1 20:02 flows.jsondrwxr-xr-x   11 node-red node-red       352 Sep  1 20:04 ./data $

随便移动一点Flow 1中的某个节点，然后Deploy，然后再确认结果，发现.flows.json.backup又一次更新了，如果没有之前备份的文件flows.backup，我们就找不回来了，也就是说，即使Deploy，还是有一次恢复的机会的，但是连续Deploy的话，就找不回来了。换句话说，只能找回最近一次Deploy前的内容。

/data $ ls -larttotal 64drwxr-xr-x    1 root     root          4096 Sep  1 19:00 ..-rw-r--r--    1 node-red node-red     12478 Sep  1 19:00 settings.js-rw-r--r--    1 node-red node-red       120 Sep  1 19:00 package.jsondrwxr-xr-x    3 node-red node-red        96 Sep  1 19:00 lib-rw-r--r--    1 node-red node-red      9385 Sep  1 19:00 .config.json.backup-rw-r--r--    1 node-red node-red      9633 Sep  1 19:34 .config.json-rw-r--r--    1 node-red node-red        44 Sep  1 19:38 flows_cred.json-rw-r--r--    1 node-red node-red      1709 Sep  1 19:43 flows.backup-rw-r--r--    1 node-red node-red       854 Sep  1 20:02 .flows.json.backup-rw-r--r--    1 node-red node-red       854 Sep  1 20:04 flows.jsondrwxr-xr-x   11 node-red node-red       352 Sep  1 20:04 ./data $

总结

简单总结如下：没有Deploy，直接Ctrl + z即可撤销。如果已经Deploy，可在隐藏的备份文件.flows.json.backup中找回。如果Deploy了2次或者以上，就无力回天了。

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