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- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend {
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
    
    UILabel *label = (UILabel *)[cell viewWithTag:104];
    dispatch_async(dispatch_get_main_queue(), ^{
        if((float)totalBytesSent / totalBytesExpectedToSend == 1.0f) {
            label.text = @"上传成功";
        }
        else {
            label.text = [NSString stringWithFormat:@"上传中：%.0f%%",100*(float)totalBytesSent / totalBytesExpectedToSend];
        }
    });
}

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'use strict';

const Host = '47.112.172.203';
const User = 'root';
const Password = 'Xw8323fox~';
const Port = 3306;
const DB = 'hxw_testdb';
const Table = 'ConnectionID_List';

const mysql = require('mysql');
const dayjs = require('dayjs');

function wrapPromise(connection, sql) {
    return new Promise((resolve, reject) => {
        connection.query(sql, function (error, results, fields) {
            if (error) {
                reject(error);
            }
            resolve(results);
        });
    });
}

async function record_connectionID(connectionID) {
    console.log("Start record_connectionID function");
    console.log("connectionID is", connectionID);

    const connection = mysql.createConnection({
        host: Host,
        user: User,
        password: Password,
        database: DB,
        port: Port
    });

    // Save the connection ID into datavase, 把 connection ID 存到数据库
    const now = new dayjs();
    const nowStr = now.format("YYYY-MM-DD HH:mm:ss");

    let addsql = `insert INTO ${Table} (\`ConnectionID\`, \`Date\`, \`Extra\`) VALUES ('${connectionID}', '${nowStr}', '囍囍囍')`;

    await wrapPromise(connection, addsql);
    connection.end();
}

exports.main_handler = async (event, context, callback) => {
    console.log("event is", event);

    console.log("event log end");
  
    if (!event.requestContext) {
      return { errNo: 101, errMsg: "not found request context" };
    }
  
    if (!event.websocket) {
      return { errNo: 102, errMsg: "not found web socket" };
    }
  
    let connectionID = event["websocket"]["secConnectionID"];
    let retmsg = {};
    retmsg["errNo"] = 0;
    retmsg["errMsg"] = "ok";
    retmsg["websocket"] = {
      action: "connecting",
      secConnectionID: connectionID
    };
  
    // Recording the new connectionID into database, 在数据库中记录新的connectionID
    console.log("Start DB Request", new dayjs().format("YYYY-MM-DD HH:mm:ss"));
  
    await record_connectionID(connectionID);
  
    console.log("Finish DB Request", new dayjs().format("YYYY-MM-DD HH:mm:ss"));
  
    console.log(
      "connecting: connection id",
      event["websocket"]["secConnectionID"]
    );
    return retmsg;
  }