姑苏城外一茅屋，万树梅花月满天

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tomoon | 节点的选择

发表于 更新于 分类于 ， ， ， Valine：

这里讲一下量化中，节点如何选择。

目前，我用的是云节点，但是，最好自己搭建节点。


bsc


方法一

用 bsc 公开的官方云节点。

首先要记住，每一个链接，同一时间最大连接数为 10，如果，想要同一时间尽可能链接多的，就要做好链接分配。

另外，同一域名的不同子域名貌似都是 10 链接数，即

https://bsc-dataseed2.defibit.io/
https://bsc-dataseed3.defibit.io/

这两个的域名都是 defibit。所以，同一时间，以一个 IP 访问不同的子域名，连接数也不能超过 10 。（这个是我在用的时候发现的，不知道现在什么情况）

按道理来讲，公共域名已经足够了，但是，有一天，bsc 网络节点大规模动荡，导致，这些节点返回的数据不一样。

比如，一个 coin 的价格，有的返回 2 有的返回 4 。对我量化程序几乎造成了巨大的打击。

这里上一下测试公共节点稳定性的代码。

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import asyncio
import random

from web3 import Web3

from constant.constant import Exchange
from constant.object import Price, ConfigTicking
from globaldata.Balance import Balance
from handler.baseHandler import BaseEngine
from logger.log import logger

abi = """[{"inputs":[{"internalType":"address","name":"_factory","type":"address"},{"internalType":"address","name":"_WETH","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"amountADesired","type":"uint256"},{"internalType":"uint256","name":"amountBDesired","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountTokenDesired","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"addLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"},{"internalType":"uint256","name":"liquidity","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountIn","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"reserveIn","type":"uint256"},{"internalType":"uint256","name":"reserveOut","type":"uint256"}],"name":"getAmountOut","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsIn","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"}],"name":"getAmountsOut","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"reserveA","type":"uint256"},{"internalType":"uint256","name":"reserveB","type":"uint256"}],"name":"quote","outputs":[{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidity","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETH","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"removeLiquidityETHSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermit","outputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountTokenMin","type":"uint256"},{"internalType":"uint256","name":"amountETHMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityETHWithPermitSupportingFeeOnTransferTokens","outputs":[{"internalType":"uint256","name":"amountETH","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint256","name":"liquidity","type":"uint256"},{"internalType":"uint256","name":"amountAMin","type":"uint256"},{"internalType":"uint256","name":"amountBMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bool","name":"approveMax","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"removeLiquidityWithPermit","outputs":[{"internalType":"uint256","name":"amountA","type":"uint256"},{"internalType":"uint256","name":"amountB","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapETHForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactETHForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForETHSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactETH","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
"""


class PancakePrice():

    def __init__(self):
        self.w31 = Web3(Web3.HTTPProvider("https://bsc-dataseed1.ninicoin.io/"))
        self.contractObj1 = self.w31.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w32 = Web3(Web3.HTTPProvider("https://bsc-dataseed2.defibit.io/"))
        self.contractObj2 = self.w32.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w33 = Web3(Web3.HTTPProvider("https://bsc-dataseed3.defibit.io/"))
        self.contractObj3 = self.w33.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w34 = Web3(Web3.HTTPProvider("https://bsc-dataseed4.defibit.io/"))
        self.contractObj4 = self.w34.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w35 = Web3(Web3.HTTPProvider("https://bsc-dataseed2.ninicoin.io/"))
        self.contractObj5 = self.w35.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w36 = Web3(Web3.HTTPProvider("https://bsc-dataseed3.ninicoin.io/"))
        self.contractObj6 = self.w36.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w37 = Web3(Web3.HTTPProvider("https://bsc-dataseed4.ninicoin.io/"))
        self.contractObj7 = self.w37.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w38 = Web3(Web3.HTTPProvider("https://bsc-dataseed2.binance.org/"))
        self.contractObj8 = self.w38.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w39 = Web3(Web3.HTTPProvider("https://bsc-dataseed3.binance.org/"))
        self.contractObj9 = self.w39.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

        self.w310 = Web3(Web3.HTTPProvider("https://bsc-dataseed4.binance.org/"))
        self.contractObj10 = self.w310.eth.contract(
            address=Web3.toChecksumAddress("0x10ed43c718714eb63d5aa57b78b54704e256024e"), abi=abi)

    def get_coin_price(self):
        sell_paths = [
            Web3.toChecksumAddress("0xa9D75Cc3405F0450955050C520843f99Aff8749D"),
            Web3.toChecksumAddress("0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c"),
            Web3.toChecksumAddress("0x55d398326f99059fF775485246999027B3197955"),
        ]

        contractObjs = [
            self.contractObj1,
            self.contractObj2,
            self.contractObj3,
            self.contractObj4,
            self.contractObj5,
            self.contractObj6,
            self.contractObj7,
            self.contractObj8,
            self.contractObj9,
            self.contractObj10,
        ]
        i = 1

        for contractObj in contractObjs:
            try:
                print(i, end=" ")
                i += 1
                buy = contractObj.functions.getAmountsOut(
                    192820000000000000000,
                    sell_paths,
                ).call()

                buy_price = float(
                    (buy[len(sell_paths) - 1] / (10 ** 18)) / (192820000000000000000 / (10 ** 18)))
                print(buy_price)
            except Exception as e:
                print("ERROR")


if __name__ == '__main__':
    while 1:
        p = PancakePrice()
        p.get_coin_price()

考虑到节点稳定性，不得不放弃了使用公共节点这个方法。

方法二

目前，我用的是这个方法，非常的 nice。

找 nodereal 非常好用，这个我付费都愿意，而且，人家现在是免费的，没有限制。

请我喝杯咖啡吧～