Upgraded case collector - support for CSV file import to provide custom data sources

Case collector re-upgrades to support CSV format file import to provide custom data sources

The most recent user needs to have their own CSV file as a data source, so that inventors can use the backtesting system of the quantified trading platform. The inventors of the backtesting system of the quantified trading platform have many features, using a concise and efficient way, so that as long as they have their own data, they can be backtested, no longer limited to the exchanges supported by the platform data center.

Design ideas

The design idea is actually very simple, we just make a little bit of a change based on the previous market collector, and we add a parameter to the market collector.isOnlySupportCSVTo control whether only CSV files are used as data sources for the retrieval system, add a parameterfilePathForCSV, a path to place CSV data files on a server run by a market collector robot; and finally, a path to place CSV data files on a server run by a market collector robot.isOnlySupportCSVWhether the parameter is set toTrueThis change is mainly due to the fact that the user can choose to use the data source (data collected by the user, data in CSV files).Providerclassdo_GETIn the function.

What is a CSV?

Comma-Separated Values (CSV, sometimes also called character separation values, because a separation can also be a comma) are files that store table data in plain text form (numbers and text). Plain text means that the file is a sequence of characters, without data that must be decoded like a binary number. CSV files are made up of arbitrary number of records, separated by some sort of comma; each record is made up of fields, separated by other characters or strings, most commonly commas or table characters.

There is no common standard for the CSV file format, but there is a rule of thumb, which is generally a record of one line, the first act heading.

For example, the CSV file that we used to test was opened with a notebook and looked like this:

Note that the first line of a CSV file is the form header.

,open,high,low,close,vol

We're going to parse this data and then construct a format that makes the retrieval system customize the data source request, which we've already addressed in the code in our previous article, with just a few tweaks.

Modified code

import _thread
import pymongo
import json
import math
import csv
from http.server import HTTPServer, BaseHTTPRequestHandler
from urllib.parse import parse_qs, urlparse

def url2Dict(url):
    query = urlparse(url).query  
    params = parse_qs(query)  
    result = {key: params[key][0] for key in params}  
    return result

class Provider(BaseHTTPRequestHandler):
    def do_GET(self):
        global isOnlySupportCSV, filePathForCSV
        try:
            self.send_response(200)
            self.send_header("Content-type", "application/json")
            self.end_headers()

            dictParam = url2Dict(self.path)
            Log("自定义数据源服务接收到请求，self.path:", self.path, "query 参数：", dictParam)
            
            # 目前回测系统只能从列表中选择交易所名称，在添加自定义数据源时，设置为币安，即：Binance
            exName = exchange.GetName()                                     
            # 注意，period为底层K线周期
            tabName = "%s_%s" % ("records", int(int(dictParam["period"]) / 1000))  
            priceRatio = math.pow(10, int(dictParam["round"]))
            amountRatio = math.pow(10, int(dictParam["vround"]))
            fromTS = int(dictParam["from"]) * int(1000)
            toTS = int(dictParam["to"]) * int(1000)

            # 要求应答的数据
            data = {
                "schema" : ["time", "open", "high", "low", "close", "vol"],
                "data" : []
            }
            
            if isOnlySupportCSV:
                # 处理CSV读取,filePathForCSV路径
                listDataSequence = []
                with open(filePathForCSV, "r") as f:
                    reader = csv.reader(f)
                    # 获取表头
                    header = next(reader)
                    headerIsNoneCount = 0
                    if len(header) != len(data["schema"]):
                        Log("CSV文件格式有误，列数不同，请检查！", "#FF0000")
                        return 
                    for ele in header:
                        for i in range(len(data["schema"])):
                            if data["schema"][i] == ele or ele == "":
                                if ele == "":
                                    headerIsNoneCount += 1
                                if headerIsNoneCount > 1:
                                    Log("CSV文件格式有误，请检查！", "#FF0000")
                                    return 
                                listDataSequence.append(i)
                                break
                    
                    # 读取内容
                    while True:
                        record = next(reader, -1)
                        if record == -1:
                            break
                        index = 0
                        arr = [0, 0, 0, 0, 0, 0]
                        for ele in record:
                            arr[listDataSequence[index]] = int(ele) if listDataSequence[index] == 0 else (int(float(ele) * amountRatio) if listDataSequence[index] == 5 else int(float(ele) * priceRatio))
                            index += 1
                        data["data"].append(arr)
                
                Log("数据：", data, "响应回测系统请求。")
                self.wfile.write(json.dumps(data).encode())
                return 
            
            # 连接数据库
            Log("连接数据库服务，获取数据，数据库：", exName, "表：", tabName)
            myDBClient = pymongo.MongoClient("mongodb://localhost:27017")
            ex_DB = myDBClient[exName]
            exRecords = ex_DB[tabName]
            
            # 构造查询条件：大于某个值{'age': {'$gt': 20}} 小于某个值{'age': {'$lt': 20}}
            dbQuery = {"$and":[{'Time': {'$gt': fromTS}}, {'Time': {'$lt': toTS}}]}
            Log("查询条件：", dbQuery, "查询条数：", exRecords.find(dbQuery).count(), "数据库总条数：", exRecords.find().count())
            
            for x in exRecords.find(dbQuery).sort("Time"):
                # 需要根据请求参数round和vround，处理数据精度
                bar = [x["Time"], int(x["Open"] * priceRatio), int(x["High"] * priceRatio), int(x["Low"] * priceRatio), int(x["Close"] * priceRatio), int(x["Volume"] * amountRatio)]
                data["data"].append(bar)
            
            Log("数据：", data, "响应回测系统请求。")
            # 写入数据应答
            self.wfile.write(json.dumps(data).encode())
        except BaseException as e:
            Log("Provider do_GET error, e:", e)


def createServer(host):
    try:
        server = HTTPServer(host, Provider)
        Log("Starting server, listen at: %s:%s" % host)
        server.serve_forever()
    except BaseException as e:
        Log("createServer error, e:", e)
        raise Exception("stop")

def main():
    LogReset(1)
    if (isOnlySupportCSV):
        try:
        # _thread.start_new_thread(createServer, (("localhost", 9090), ))         # 本机测试
            _thread.start_new_thread(createServer, (("0.0.0.0", 9090), ))         # VPS服务器上测试
            Log("开启自定义数据源服务线程，数据由CSV文件提供。", "#FF0000")
        except BaseException as e:
            Log("启动自定义数据源服务失败！")
            Log("错误信息：", e)
            raise Exception("stop")
        while True:
            LogStatus(_D(), "只启动自定义数据源服务，不收集数据！")
            Sleep(2000)
    
    exName = exchange.GetName()
    period = exchange.GetPeriod()
    Log("收集", exName, "交易所的K线数据，", "K线周期:", period, "秒")
    
    # 连接数据库服务，服务地址 mongodb://127.0.0.1:27017 具体看服务器上安装的mongodb设置
    Log("连接托管者所在设备mongodb服务，mongodb://localhost:27017")
    myDBClient = pymongo.MongoClient("mongodb://localhost:27017")   
    # 创建数据库
    ex_DB = myDBClient[exName]
    
    # 打印目前数据库表
    collist = ex_DB.list_collection_names()
    Log("mongodb ", exName, " collist:", collist)
    
    # 检测是否删除表
    arrDropNames = json.loads(dropNames)
    if isinstance(arrDropNames, list):
        for i in range(len(arrDropNames)):
            dropName = arrDropNames[i]
            if isinstance(dropName, str):
                if not dropName in collist:
                    continue
                tab = ex_DB[dropName]
                Log("dropName:", dropName, "删除：", dropName)
                ret = tab.drop()
                collist = ex_DB.list_collection_names()
                if dropName in collist:
                    Log(dropName, "删除失败")
                else :
                    Log(dropName, "删除成功")
    
    # 开启一个线程，提供自定义数据源服务
    try:
        # _thread.start_new_thread(createServer, (("localhost", 9090), ))     # 本机测试
        _thread.start_new_thread(createServer, (("0.0.0.0", 9090), ))         # VPS服务器上测试
        Log("开启自定义数据源服务线程", "#FF0000")
    except BaseException as e:
        Log("启动自定义数据源服务失败！")
        Log("错误信息：", e)
        raise Exception("stop")
    
    # 创建records表
    ex_DB_Records = ex_DB["%s_%d" % ("records", period)]
    Log("开始收集", exName, "K线数据", "周期：", period, "打开（创建）数据库表：", "%s_%d" % ("records", period), "#FF0000")
    preBarTime = 0
    index = 1
    while True:
        r = _C(exchange.GetRecords)
        if len(r) < 2:
            Sleep(1000)
            continue
        if preBarTime == 0:
            # 首次写入所有BAR数据
            for i in range(len(r) - 1):
                bar = r[i]
                # 逐根写入，需要判断当前数据库表中是否已经有该条数据，基于时间戳检测，如果有该条数据，则跳过，没有则写入
                retQuery = ex_DB_Records.find({"Time": bar["Time"]})
                if retQuery.count() > 0:
                    continue
                
                # 写入bar到数据库表
                ex_DB_Records.insert_one({"High": bar["High"], "Low": bar["Low"], "Open": bar["Open"], "Close": bar["Close"], "Time": bar["Time"], "Volume": bar["Volume"]})                
                index += 1
            preBarTime = r[-1]["Time"]
        elif preBarTime != r[-1]["Time"]:
            bar = r[-2]
            # 写入数据前检测，数据是否已经存在，基于时间戳检测
            retQuery = ex_DB_Records.find({"Time": bar["Time"]})
            if retQuery.count() > 0:
                continue
            
            ex_DB_Records.insert_one({"High": bar["High"], "Low": bar["Low"], "Open": bar["Open"], "Close": bar["Close"], "Time": bar["Time"], "Volume": bar["Volume"]})
            index += 1
            preBarTime = r[-1]["Time"]
        LogStatus(_D(), "preBarTime:", preBarTime, "_D(preBarTime):", _D(preBarTime/1000), "index:", index)
        # 增加画图展示
        ext.PlotRecords(r, "%s_%d" % ("records", period))
        Sleep(10000)
        

Running tests

First we start the market collector robot, we add an exchange to the robot, and we make the robot work. The parameters are configured:

We then created a test strategy:

function main() {
    Log(exchange.GetRecords())
    Log(exchange.GetRecords())
    Log(exchange.GetRecords())
}

The trick is simple: just get and print three K-string data.

The retrieval page, the data source for which the retrieval system is set as a custom data source, and the address filling is the server address run by the market gathering bot. Since the data in our CSV file is a 1-minute K-line, we set the K-line cycle to 1 minute when retrieving.

Click to start retrieving, and the market gathering robot receives a data request:

After the re-testing system execute the policy, a K-line chart is generated based on the K-line data in the data source.

Compare the data in the file:

RecordsCollector (upgraded to provide custom data source functionality, support for CSV data file to provide data source)

I'm glad to see you're back, and welcome to your comments.