将Cyber​​power UPS的JSON解析为InfluxDB / Grafana

时间：2018-02-16 16:07:12

标签： javascript json bash influxdb grafana

我正在尝试从我的Cyber​​power UPS代理解析JSON（用于将数据导入InfluxDB / Grafana）。除了电池状态，我能够解析我想要的一切。如下所示，如果UPS与公用电源断开连接，状态为“放电”，但如果已连接，则该值包含逗号，“正常，完全充电” ....我无法找到解析数据的方法，因为知道该值可能有也可能没有逗号。如果值是“放电”，那么它工作正常，但由于“正常，完全充电”中的逗号，grep结果为“正常（显然缺少结束报价）。

单值的JSON：

"battery":{"state":"Discharging",

带逗号和空格的值的JSON：

"battery":{"state":"Normal, Fully Charged",

我的curl / greb。是否可以这样做来提取一个值，该值可能有也可能没有我想要的值的逗号？如果是这样，我做错了什么？

curl http://10.0.1.61:3052/agent/ppbe.js/init_status.js | grep -oP '(?<="battery":{"state":)[^,]*' | head -1

放电时的完整.js页面： 

var ppbeJsObj = {
    "status": {
        "communicationAvaiable": true,
        "onlyPhaseArch": false,
        "utility": {
            "state": "Blackout",
            "stateWarning": true,
            "voltage": "0",
            "frequency": "60.00",
            "voltages": null,
            "currents": null,
            "frequencies": null,
            "powerFactors": null
        },
        "bypass": {
            "state": "Normal",
            "stateWarning": false,
            "voltage": null,
            "current": null,
            "frequency": null,
            "voltages": null,
            "currents": null,
            "frequencies": null,
            "powerFactors": null
        },
        "output": {
            "state": "Normal",
            "stateWarning": false,
            "voltage": "120.0",
            "frequency": null,
            "load": 58,
            "watt": 522,
            "current": null,
            "outputLoadWarning": false,
            "outlet1": null,
            "outlet2": null,
            "activePower": null,
            "apparentPower": null,
            "reactivePower": null,
            "voltages": null,
            "currents": null,
            "frequencies": null,
            "powerFactors": null,
            "loads": null,
            "activePowers": null,
            "apparentPowers": null,
            "reactivePowers": null,
            "emergencyOff": null,
            "batteryExhausted": null
        },
        "battery": {
            "state": "Discharging",
            "stateWarning": true,
            "voltage": null,
            "capacity": 99,
            "runtimeFormat": 1,
            "runtimeFormatWarning": false,
            "runtimeHour": 0,
            "runtimeMinute": 20,
            "chargetimeFormat": null,
            "chargetimeHour": null,
            "chargetimeMinute": null,
            "temperatureCelsius": null,
            "highVoltage": null,
            "lowVoltage": null,
            "highCurrent": null,
            "lowCurrent": null
        },
        "upsSystem": {
            "state": "Normal",
            "stateWarning": false,
            "temperatureCelsius": null,
            "temperatureFahrenheit": null,
            "maintenanceBreak": null,
            "systemFaultDueBypass": null,
            "systemFaultDueBypassFan": null,
            "originalHardwareFaultCode": "0x8080"
        },
        "modules": null,
        "deviceId": 0
    }
};

2 个答案:

答案 0 :(得分：1)

bash解决方案：

你可以这样做： 

curl http://10.0.1.61:3052/agent/ppbe.js/init_status.js | \
grep -oP '(?<="battery":\s*{)([^}]+)(?=})' | \
grep -oP '(?<="state": ")([^"]+)(?=")'

打破这个局面：

首先是正则表达式。

(?<=)是群体背后的正面看法。因此(?<=aa)bb将匹配bb之前的任何aa。

(?=)是一个积极向前看的小组，因此，bb(?=aa)将匹配bb之后的所有aa。

现在，命令，

获取文件：curl http://10.0.1.61:3052/agent/ppbe.js/init_status.js | \

找到battery部分：grep -oP '(?<="battery":\s*{)([^}]+)(?=})' | \ 这将把它转换成这种东西：

"state": "Normal, Fully Charged",
"stateWarning": true,
"voltage": null,
"capacity": 99,
"runtimeFormat": 1,
"runtimeFormatWarning": false,
"runtimeHour": 0,
"runtimeMinute": 20,
"chargetimeFormat": null,
"chargetimeHour": null,
"chargetimeMinute": null,
"temperatureCelsius": null,
"highVoltage": null,
"lowVoltage": null,
"highCurrent": null,
"lowCurrent": null

找到state键/值：grep -oP '(?<="state": ")([^"]+)(?=")' 然后这个将返回值： 

Normal, Fully Charged

对于更高级的JSON，您可以执行以下操作： 

curl http://10.0.1.61:3052/agent/ppbe.js/init_status.js | \
grep -oP '(?<="battery":\s*{)(([^{}]++|(?1))*)(?=})' | \
grep -oP '(?<="state": ")([^"]+)(?=")'

请参阅（https://unix.stackexchange.com/a/147664）了解其工作原理。

JS解决方案：

你可以去掉变量声明和分号，然后像普通的JSON那样解析它。 

// Here 'input' is your 'init_status.js' string
input = JSON.parse(input.replace(
    /(?:^[\s\S]*?(?={))|(?:;[^;]*?$)/g,
    ""
))

如果您还需要“获取”该文件，那么您可以这样做： 

const http = require('http');
http.get(
    'http://10.0.1.61:3052/agent/ppbe.js/init_status.js',
    response => {
        let body = '';

        // Read the data.
        response.on('data', chunk => {body += chunk});

        // The file is complete, now we can use it.
        response.on('end', () => {
            const data = JSON.parse(
                body.replace(
                    /(?:^[\s\S]*?(?={))|(?:;[^;]*?$)/g,
                    ""
                )
            );

            // This logs the entire JSON object.
            console.log(data);

            // Getting the 'battery state'
            console.log(data.status.battery.state);
        });
    }
);

答案 1 :(得分：1)

这应该有效：

grep -P -o '(?<="battery":{"state":")[a-zA-Z, ]+'

问候！

编辑：由OP评论编辑。

$ cat test.txt
var ppbeJsObj={"status":{"communicationAvaiable":true,
"onlyPhaseArch":false,
"utility":{"state":"Blackout",
"stateWarning":true,
"voltage":"0",
"frequency":"60.00",
"voltages":null,
"currents":null,
"frequencies":null,
"powerFactors":null},
"bypass":{"state":"Normal",
"stateWarning":false,
"voltage":null,
"current":null,
"frequency":null,
"voltages":null,
"currents":null,
"frequencies":null,
"powerFactors":null},
"output":{"state":"Normal",
"stateWarning":false,
"voltage":"120.0",
"frequency":null,
"load":58,
"watt":522,
"current":null,
"outputLoadWarning":false,
"outlet1":null,
"outlet2":null,
"activePower":null,
"apparentPower":null,
"reactivePower":null,
"voltages":null,
"currents":null,
"frequencies":null,
"powerFactors":null,
"loads":null,
"activePowers":null,
"apparentPowers":null,
"reactivePowers":null,
"emergencyOff":null,
"batteryExhausted":null},
"battery":{"state":"Discharging",
"stateWarning":true,
"voltage":null,
"capacity":99,
"runtimeFormat":1,
"runtimeFormatWarning":false,
"runtimeHour":0,
"runtimeMinute":20,
"chargetimeFormat":null,
"chargetimeHour":null,
"chargetimeMinute":null,
"temperatureCelsius":null,
"highVoltage":null,
"lowVoltage":null,
"highCurrent":null,
"lowCurrent":null},
"upsSystem":{"state":"Normal",
"stateWarning":false,
"temperatureCelsius":null,
"temperatureFahrenheit":null,
"maintenanceBreak":null,
"systemFaultDueBypass":null,
"systemFaultDueBypassFan":null,
"originalHardwareFaultCode":"0x8080"},
"modules":null,
"deviceId":0}};

$ grep -P -o '(?<="battery":{"state":")[a-zA-Z, ]+' test.txt
Discharging
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