142 lines
3.9 KiB
Go
142 lines
3.9 KiB
Go
package service
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import (
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"dddexample/normal/common"
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model2 "dddexample/normal/model"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/IBM/sarama"
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"io"
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"net/http"
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)
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func TransferOld(sourceUserId int, targetAccountNumber string, targetAmount float64, targetCurrency string) error {
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// 1. 从数据库读取数据，忽略所有校验逻辑如账号是否存在等,错误忽略
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var targetAccountDO, sourceAccountDO model2.Account
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model2.DB.Model(&model2.Account{}).Find(&sourceAccountDO, sourceUserId)
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model2.DB.Model(&model2.Account{}).Where(&model2.Account{TelNum: targetAccountNumber}).Find(&targetAccountDO)
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// 2. 业务参数校验
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if targetAccountDO.Currency != targetCurrency {
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return errors.New("收款人货币种类与转账使用货币不同")
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}
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// 3. 获取外部数据，并且包含一定的业务逻辑 获取汇率
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exchangeRate := 1.0
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if sourceAccountDO.Currency != targetCurrency {
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var err error
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res, err := http.Get("http://www.google.com?now=" + sourceAccountDO.Currency + "&targetCurrency=" + targetCurrency)
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if err != nil {
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return err
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}
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body, err := io.ReadAll(res.Body)
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res.Body.Close()
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if err != nil {
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return err
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}
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if res.StatusCode != 200 {
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return errors.New(fmt.Sprintf("Response failed with status code: %d and\nbody: %s\n", res.StatusCode, body))
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}
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var yahuRes common.YaHuRes
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err = json.Unmarshal(body, &yahuRes)
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if err != nil {
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return err
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}
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exchangeRate = yahuRes.Rate
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}
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sourceAmount := targetAmount * exchangeRate
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// 4. 业务参数校验
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if sourceAccountDO.Amount < sourceAmount {
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return errors.New("余额不足")
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}
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if sourceAccountDO.DailyLimit < sourceAmount {
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return errors.New("超出限额")
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}
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// 5. 计算新值，并且更新字段
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sourceAccountDO.Amount -= sourceAmount
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targetAccountDO.Amount += sourceAmount
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// 6. 更新到数据库
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model2.DB.Save(sourceAccountDO)
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model2.DB.Save(targetAccountDO)
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// 7. 发送审计消息String message = sourceUserId + "," + targetAccountNumber + "," + targetAmount + "," + targetCurrency;
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//common.SendKafka("kafka", "")
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config := sarama.NewConfig()
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config.Producer.RequiredAcks = sarama.WaitForAll
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config.Producer.Retry.Max = 5
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config.Producer.Return.Successes = true
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producer, err := sarama.NewSyncProducer([]string{"localhost:9092"}, config)
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if err != nil {
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fmt.Println("Failed to create producer:", err)
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return err
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}
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defer producer.Close()
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message := &sarama.ProducerMessage{
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Topic: "my_topic",
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Value: sarama.StringEncoder("Hello, Kafka!"),
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}
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_, _, err = producer.SendMessage(message)
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return err
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}
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func Transfer(sourceUserId int, targetAccountNumber string, targetAmount float64, targetCurrency string) error {
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// 1. 从数据库读取数据，忽略所有校验逻辑如账号是否存在等
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sourceAccountDO := model2.SelectByUserId(sourceUserId)
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targetAccountDO := model2.SelectByAccountNumber(targetAccountNumber)
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// 2. 业务参数校验
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if targetAccountDO.Currency != targetCurrency {
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return errors.New("收款人货币种类与转账使用货币不同")
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}
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// 3. 获取外部数据，并且包含一定的业务逻辑 获取汇率
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exchangeRate := 1.0
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if sourceAccountDO.Currency != targetCurrency {
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var err error
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exchangeRate, err = common.GetExchangeRate(sourceAccountDO.Currency, targetCurrency)
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if err != nil {
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return err
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}
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}
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sourceAmount := targetAmount * exchangeRate
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// 4. 业务参数校验
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if sourceAccountDO.Amount < sourceAmount {
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return errors.New("余额不足")
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}
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if sourceAccountDO.DailyLimit < sourceAmount {
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return errors.New("超出限额")
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}
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// 5. 计算新值，并且更新字段
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sourceAccountDO.Amount -= sourceAmount
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targetAccountDO.Amount += sourceAmount
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// 6. 更新到数据库
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model2.DB.Save(sourceAccountDO)
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model2.DB.Save(targetAccountDO)
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// 7. 发送审计消息String message = sourceUserId + "," + targetAccountNumber + "," + targetAmount + "," + targetCurrency;
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common.SendKafka("kafka", "")
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return nil
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}
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