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+# Web侧高频数据 chart 展示预研说明文档 
+
+Author: 彭玲 	CreatedTime: 2021/5/11 
+
+---
+
+[TOC]
+
+---
+
+
+
+## 背景 
+
+目前，光纤光栅、振动连续采集、动应变、GNSS 实时动态解析等的采样频率高达到 1~100Hz（或更高）。针对高频采样，之前接入侧常采用”降低采样频率“”分时段采样（振动）“等处理方式，但存在数据”丢失“的必然结果。
+
+为满足客户对高频数据接入的需求，针对高频数据采集进行了专项处理：平台侧接收原始采集粒度数据、存储于 HDFS 文件系统中，并提供 HDFS 查询服务和可视化 (不限于平台)。
+
+
+
+## 功能说明 
+
+Web侧将平台接入的高频数据以图表形式进行展示。
+
+### 输入 
+
+输入为：chart 图片的 Base64 地址 (Data URLs) 
+
+- Data URLs：`data:image/png;base64,<image-data>` 
+- Base64 图片来源：平台 PyRpcService (http://10.8.30.22/FS-Anxinyun/trunk/codes/services/PyRpcService) 接口查询服务`high_frequency_chart`(查询 HDFS 存储数据) 
+
+### 输出 
+
+输出为：chart 图片 
+
+必要的查询组件：**结构物**选择器、**起止时间**选择框 
+
+![](E:\WorkSpace\iFS-Backend\高频数据接入\assets\高频数据展示-web-demo.png)
+
+
+
+## Postman 请求 
+
+参数说明：
+
+- HDFS 文件地址，包括：结构物 id，HDFS 文件夹 `<年份>`，HDFS 文件夹 `<月份>` 
+- 查询起止时间：Unix 时间戳 (ms) 
+
+![](E:\WorkSpace\iFS-Backend\高频数据接入\assets\Postman RPC：high_frequency_chart.png)
+
+
+
+## 关键代码 
+
+### web-api 
+
+```js
+const request = require('superagent')
+
+module.exports = {
+    entry: function (app, router, opts) {
+
+        const RPC_SVR_URL = opts.highFrequencyChartRpcSvrUrl || `http://localhost:15000/api`;
+
+        let fetchHighFrequencyChartData = async function (ctx, next) {
+            const params = ctx.request.body;
+            try {
+                const reqBody = {
+                    "jsonrpc": "2.0",
+                    "id": "myid",
+                    "method": "high_frequency_chart",
+                    "params": params,
+                    // "params": {
+                    //     "url": "/anxinyun/structure_data/structure_854/raw/2021/2/gxwd1-1.csv",
+                    //     "gte": 1613810269584,
+                    //     "lt": 1613810706956
+                    // }
+                }
+                const proxyReq = request.post(RPC_SVR_URL).send(reqBody)
+                const res = await proxyReq
+
+                ctx.status = res.status
+                ctx.body = { data: res.body.result }
+            } catch (e) {
+                let errMsg = `fetch high_frequency_chart data error: ${e}`
+                ctx.status = 500;
+                ctx.fs.logger.error(errMsg)
+                ctx.body = { err: errMsg }
+            }
+        }
+
+        router.post('/_high_frequency_chart', fetchHighFrequencyChartData)
+    }
+};
+
+```
+
+
+
+### web 
+
+```js
+import React, { Component } from 'react'
+
+import { Select, DatePicker } from 'antd'
+const Option = Select.Option
+const { RangePicker } = DatePicker
+
+const request = require('superagent')
+
+class HighFrequencyChart extends Component {
+    constructor(props) {
+        super(props)
+
+        this.state = {
+            chartData: null
+        }
+    }
+
+    fetchHighFrequencyChartData = () => {
+        let structId = 854
+        let hdfsDirYear = '2021',
+            hdrsDirMonth = '2'
+        let filterBegin = 1613810269584, // 2021-02-20 16:37:49
+            fiterEnd = 1613810706956 // 2021-02-20 16:45:06
+
+        const params = {
+            // Example: /anxinyun/structure_data/structure_854/raw/2021/2/gxwd1-1.csv 
+            "url": `/anxinyun/structure_data/structure_${structId}/raw/${hdfsDirYear}/${hdrsDirMonth}/gxwd1-1.csv`,
+            "gte": filterBegin, // begin time for part of the HDFS resource 
+            "lt": fiterEnd // end time for part of the HDFS resource 
+        }
+
+        request.post('_high_frequency_chart').send(params).end((err, res) => {
+            if (!err) {
+                let chartData = res.body.data
+                this.setState({ chartData })
+            } else {
+                // handle err msg... 
+            }
+        })
+    }
+
+    componentDidMount() {
+        this.fetchHighFrequencyChartData()
+    }
+
+    renderStructures = () => {
+        return (
+            <Select
+                showSearch
+                style={{ width: 200 }}
+                placeholder="Select a structure"
+                optionFilterProp="children"
+                filterOption={(input, option) => option.props.children.toLowerCase().indexOf(input.toLowerCase()) >= 0}
+            >
+                <Option value="bridge">桥梁 #1</Option>
+                <Option value="slope">边坡 #2</Option>
+            </Select>
+        )
+    }
+
+    renderRangePicker = () => {
+        return (
+            <RangePicker
+                showTime={{ format: 'HH:mm' }}
+                format="YYYY-MM-DD HH:mm"
+                placeholder={['Start Time', 'End Time']}
+            />
+        )
+    }
+
+    renderHighFrequencyChart = () => {
+        let data = this.state.chartData
+        if (data) {
+            return <img src={data} width='1000' height='500' />
+        }
+        return null
+    }
+
+    render() {
+        return (
+            <div>
+                <section style={{ padding: '32px 0' }}>
+                    <span>结构物选择：</span>{this.renderStructures()}
+                    <span style={{ paddingLeft: '24px' }}>起止时间选择：</span>{this.renderRangePicker()}
+                </section>
+
+                {/* HighFrequencyChart Module */}
+                <section>
+                    {this.renderHighFrequencyChart()}
+                </section>
+            </div>
+        )
+    }
+}
+
+export default HighFrequencyChart
+
+```
+
+
+