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在微服务中保证数据一致性

提现服务向money服务发起数据请求，对该用户扣款一元代码如下： # 预先插入数据 withdraw_log = WithDrawLog() withdraw_log.Uid = uid withdraw_log.Money...= str(money) withdraw_log.FlowNo = flow_no withdraw_log.Aliname = username withdraw_log.Aliaccount =...useraccount withdraw_log.Type = withdraw_type wid = await withdraw_log.save() ret = await request_api...withdraw服务 flow_no = get_rnd_flow_no() withdraw_log = WithDrawLog() withdraw_log.Uid = uid withdraw_log.Money...useraccount withdraw_log.Type = withdraw_type withdraw_log.FlowNo = flow_no withdraw_log.Status = 'predo

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【测试平台系列】第一章手撸压力机（十二）-初步实现提取功能

model目录下新建withdraw.go // Package model ----------------------------- // @file : withdraw.go // @...------------------------------------ package model type Withdraws struct { WithdrawList []*Withdraw...json:"withdraw_list,omitempty" // 提取是一个列表 } type Withdraw struct { IsEnable bool json...结构体的提取方法model/withdraw.go // http请求提取 func (wd *Withdraw) WithdrawHttp(resp *fasthttp.Response, variable...withdraw.IsEnable { continue } withdraw.WithdrawHttp

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智能合约安全审计之路-重入攻击

public credit; //credit表示存储用户的余额 event Deposit(address _who, uint value); //Deposit表示充值 event Withdraw...(amount)(); credit[msg.sender]-=amount; emit Withdraw(msg.sender, amount); return true...就是因为这种情况，攻击者可以反复进行withdraw(),在进入withdraw()之前，第一步的校验仍然有效，在进入withdraw()之后，credit(余额)并没有减少，第一步的校验仍然有效，攻击者才能源源不断的从合约中提取...{ mapping (address => uint) public credit; event Deposit(address _who, uint value); event Withdraw...攻击的过程中由于一直通过withdraw()函数进行循环提现，过程有点缓慢，等gas消耗完毕既可以查看(checkBalance)攻击者合约账号余额为51 wei ETH,再次查看ReentrancyGame

1K3 0

函数（三）

: res = func(*args,**kwargs) return res return wrapper @login_deco def withdraw...(): print('from withdraw') withdraw() withdraw() withdraw() 有参装饰器 is_login_dict = {'username':...shopping) # shopping() @auth('file') def shopping(): print('from shopping') @auth('mongodb') def withdraw...(): print('from withdraw') 注意：装饰器给函数增加功能吗，但是不改变函数内部的语法，不改变函数调用方式

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存折与信用卡（继承）Python

、取款（withdraw，操作成功提示“withdraw ok!”）和查询余额（check）的操作，取款金额必须在余额范围内，否则提示“sorry! over balance!”。...balance is 1500 withdraw ok! balance is 500 balance is 500 saving ok! balance is 1000 sorry!...return self.balance= self.balance - amount print('withdraw ok!')...__limit) def withdraw(self): amount=float(input()) if amount>self.balance+self....return self.balance= self.balance - amount print('withdraw ok!')

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【愚公系列】2021年12月面向对象设计原则(六)-合成复用原则(Composite Reuse Principle or CRP)

//余额 public abstract void Transfer(BankCard card, double amount);//转账 public abstract void Withdraw...(double amount) { Console.WriteLine("Withdraw"); } } 以上这种设计将银行卡的大部分功能封装在抽象基类BankCard中，建设银行普通银行卡类...public interface ICard { void Transfer(BankCardBase card, double amount);//转账 void Withdraw(...(double amount) { Console.WriteLine("Withdraw"); } } 建设银行普通银行卡实体类，继承自银行卡抽象基类并实现ICard银行卡接口...(double amount) { Console.WriteLine("Withdraw"); } } 建设银行龙卡信用卡实体类，继承自银行卡抽象基类并实现ICreditCard

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Python写的ATM小程序

Withdraw" print " 3. Cash in" print " 4. Print list" print " 5. .../usr/bin/python import time #withdraw function def with_draw(n,m): print "Hello %s, you account...%(n,m) print "Attention: There are 5% fee per withdraw !" ...(n,draw) return m def withdraw_file_write(user,withdraw): shouxufei = cash * 0.05 tran_time...|%d|%d \n" %(user,tran_time,withdraw,shouxufei)) f.close() cashin.py #!

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python的小程序

amount): if amount <= 0: raise ValueError('must be positive(存入金额有误)') self.balance += amount def withdraw...raise ValueError('您输入的金额有误,谢谢使用') acct1 = Account('123-456-789', 'Justin') deposit1 = acct1.deposit withdraw1...= acct1.withdraw acct2 = Account('987-654-321', 'Momor') deposit2 = acct2.deposit withdraw2 = acct2....withdraw if account ==acct1.name: if f==1: deposit1(a) elif f==0: withdraw1(b) print('账号:',acct1....name,'当前余额为：',acct1.balance) elif account ==acct2.name: if f==1: deposit2(a) elif f==0: withdraw2

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存折类定义（类与对象）Python

、取款（withdraw，操作成功提示“withdraw ok!”）和查询余额（check）的操作，取款金额必须在余额范围内，否则提示“sorry! over limit!”。...Tom's balance is 1500 withdraw ok! Tom's balance is 500 John's balance is 500 saving ok!...def withdraw(self): self.minus=int(input()) if self.minus>self.balance: print...return self.balance=self.balance-self.minus print("withdraw ok!")...() a.check() b.datain() b.check() b.deposit() b.check() b.withdraw() b.check()

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LeetCode 2241. 设计一个 ATM 机器

void deposit(int[] banknotesCount) 分别存入 20 ，50，100，200 和 int[] withdraw(int amount) 返回一个长度为 5 的数组，分别表示...20 ，50，100 ，200 和示例 1：输入： ["ATM", "deposit", "withdraw", "deposit", "withdraw", "withdraw"] [[],...atm.withdraw(600); // 返回 [-1] 。...atm.withdraw(550); // 返回 [0,1,0,0,1] ，机器会返回 1 张 $50 的钞票和 1 张 $500 的钞票。...函数 withdraw 和 deposit 至少各有一次调用。

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LeetCode 2043. 简易银行系统

boolean withdraw(int account, long money) 从编号为 account 的账户取款 money 美元。如果交易成功，返回 true ；否则，返回 false 。...示例：输入： ["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"] [[[10, 100, 20, 50, 30]],...] 输出： [null, true, true, true, false, false] 解释： Bank bank = new Bank([10, 100, 20, 50, 30]); bank.withdraw...bank.withdraw(10, 50); // 返回 false ，交易无效，因为账户 10 并不存在。...return false; Ac[account-1] += money; return true; } bool withdraw

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Lua连续教程之Lua面向对象编程

如果我们改变类对象的名称，withdraw就不能工作了： a, Account = Account, nil a.withdraw(100.00) -- ERROR!...self，可以对多个对象调用相同的方法： a2 = {balance = 0, withdraw = Account.withdraw} ... a2.withdraw(a2,260.00) 使用参数self...使用冒号操作符，我们可以将上例重写为a2:withdraw(260.00): function Account:withdraw(v) self.balance = self.balance -v end...(200.00)还是会执行 SpecialAccount的withdraw方法，但当withdraw调用 self:getLimit时，调用的是上述的定义。...我们的withdraw方法会变成： function Account.withdraw(self,v) balance[self] = balance[self] -v end 这样做的好处在于私有性

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存折与信用卡（继承）Java

、取款（withdraw，操作成功提示“withdraw ok!”）和查询余额（check）的操作，取款金额必须在余额范围内，否则提示“sorry! over balance!”。...balance is 1500 withdraw ok! balance is 500 balance is 500 saving ok! balance is 1000 sorry!...; } public void withdraw(){ float amount=scan.nextFloat(); if(amount>balance)...; return; } balance-=amount; System.out.println("withdraw ok!")...; return; } balance-=amount; System.out.println("withdraw ok!")

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mpvue下小程序云开发实现余额提现订阅消息提醒

# 订阅消息发送云函数添加 # 参照前文mpvue框架下使用小程序云开发获取用户openid添加具有发送订阅消息功能实现的代码 1.云开发控制台添加云函数 withdraw_apply_notice...2.微信开发者工具中同步云函数并下载 3.将下载后的withdraw_apply_notice云函数文件夹拷贝至项目的static/function目录下(这样在编辑保存时会自动编译到dist目录相应的文件夹下...) 4.根据业务场景实现发送功能 5.上传并部署代码 # static/function/withdraw_apply_notice文件夹下对应的代码 ?...# 下发订阅消息下发场景是用户输入提现金额点击确定按钮之后触发消息下发 withDraw(params).then(res => { this.loginLoading = false if...', data: { withdraw_time: formatTime((new Date()).getTime()), amount: this.amount

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存折与信用卡（继承）

、取款（withdraw，操作成功提示“withdraw ok!”）和查询余额（check）的操作，取款金额必须在余额范围内，否则提示“sorry! over balance!”。...balance is 1500 withdraw ok! balance is 500 balance is 500 saving ok! balance is 1000 sorry!...<<endl; } void withdraw() { float amount; cin>>amount; if(amount>balance) { cout...<<endl; return; } balance-=amount; cout<<"withdraw ok!"...<<endl; return; } balance-=amount; cout<<"withdraw ok!"

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币安链BSC众筹系统开发技术详细分析

到期之后可以将代币转入（execute）到另一个合约，也可以将代币提取出来（withdraw）。...所以我们抽像出来了三个关键函数：stake()execute()withdraw()scaffold-eth也为我们提供了这样的一个脚手架，只需要把代码拉下来，我们本次就在这个基础上逐步来实现。...function withdraw() public { uint256 userBalance = balances[msg.sender]; require(userBalance...> 0, "You don't have balance to withdraw"); balances[msg.sender] = 0; (bool sent, ) =..."complete()")); require(sent, "exampleExternalContract.complete() failed"); } function withdraw

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重入攻击概述

balanceOf(address _who) public view returns (uint balance) { return balances[_who]; } function withdraw...} balances[msg.sender] -= _amount; } } function() public payable {} } 合约分析在这里我们重点来看withdraw...function() public payable { if(address(reInstance).balance >= 1 ether){ reInstance.withdraw...} 2、确保状态变量改变发生在ether被发送(或者任何外部调用)之前，即Solidity官方推荐的检查-生效-交互模式(checks-effects-interactions); function withdraw...(_amount);//交互 } } 3、使用互斥锁：添加一个在代码执行过程中锁定合约的状态变量，防止重入调用 bool reEntrancyMutex = false; function withdraw

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重入攻击概述

balanceOf(address _who) public view returns (uint balance) { return balances[_who]; } function withdraw...} balances[msg.sender] -= _amount; } } function() public payable {} } 合约分析在这里我们重点来看withdraw...function() public payable { if(address(reInstance).balance >= 1 ether){ reInstance.withdraw...来获取一个实例： 1.png 之后获取instance合约的地址 image.png 之后在remix中部署攻击合约 2.png 我们需要在受攻击的合约里给我们的攻击合约地址增加一些balance以完成withdraw...} 2、确保状态变量改变发生在ether被发送(或者任何外部调用)之前，即Solidity官方推荐的检查-生效-交互模式(checks-effects-interactions); function withdraw

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日拱一卒，伯克利CS61A，有这么扎实的作业，还愁学生实力不强吗？

>>> ch.withdraw(3) # Ok, two free withdrawals is enough 13 >>> ch.withdraw(3) 9 >>...ch.withdraw(3) # ch still charges a fee 5 >>> ch.withdraw(5) # Not enough to cover fee + withdraw...balance. >>> withdraw = make_withdraw(1000) >>> withdraw(100) 900 >>> withdraw(100)...def make_withdraw(balance, password): """Return a password-protected withdraw function. >>>...Q10: Joint Account 现在需要我们开发账号关联功能，实现一个函数make_joint，它接收三个输入：一个有密码保护的withdraw函数 withdraw函数的原始密码关联withdraw

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Python线程-线程的同步（三）

_semaphore = threading.Semaphore() def withdraw(self, amount): """取钱""" self...._balance -= amount print("Withdraw %d, balance %d" % (amount, self...._semaphore.release()def withdraw(account, amount): """取钱线程函数""" account.withdraw(amount) time.sleep...创建账户对象account = Account(1000)# 创建多个线程并启动它们threads = []for i in range(5): t = threading.Thread(target=withdraw...取款线程使用 withdraw() 方法从账户中取出一定金额，并使用信号量控制对共享资源的访问。最后，我们使用 join() 方法等待线程结束。

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