348 lines
9.8 KiB
Go
348 lines
9.8 KiB
Go
package usecase
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import (
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"backend/pkg/notification/config"
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"backend/pkg/notification/domain/entity"
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"backend/pkg/notification/domain/repository"
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"backend/pkg/notification/domain/usecase"
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"context"
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"fmt"
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"math"
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"sort"
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"time"
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errs "backend/pkg/library/errors"
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)
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// DeliveryUseCaseParam 傳送參數配置
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type DeliveryUseCaseParam struct {
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SMSProviders []usecase.SMSProvider
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EmailProviders []usecase.EmailProvider
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DeliveryConfig config.DeliveryConfig
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HistoryRepo repository.HistoryRepository // 可選的歷史記錄 repository
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Logger errs.Logger // 日誌記錄器
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}
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// DeliveryUseCase 通知發送服務
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type DeliveryUseCase struct {
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param DeliveryUseCaseParam
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}
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func MustDeliveryUseCase(param DeliveryUseCaseParam) usecase.DeliveryUseCase {
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// 設置默認配置
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if param.DeliveryConfig.MaxRetries == 0 {
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param.DeliveryConfig.MaxRetries = 3
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}
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if param.DeliveryConfig.InitialDelay == 0 {
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param.DeliveryConfig.InitialDelay = 100 * time.Millisecond
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}
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if param.DeliveryConfig.BackoffFactor == 0 {
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param.DeliveryConfig.BackoffFactor = 2.0
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}
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if param.DeliveryConfig.MaxDelay == 0 {
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param.DeliveryConfig.MaxDelay = 30 * time.Second
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}
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if param.DeliveryConfig.Timeout == 0 {
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param.DeliveryConfig.Timeout = 30 * time.Second
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}
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return &DeliveryUseCase{
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param: param,
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}
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}
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func (use *DeliveryUseCase) SendMessage(ctx context.Context, req usecase.SMSMessageRequest) error {
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// 創建歷史記錄
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history := &entity.DeliveryHistory{
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Type: "sms",
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Recipient: req.PhoneNumber,
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Subject: "",
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Content: req.MessageContent,
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Status: entity.DeliveryStatusPending,
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AttemptCount: 0,
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CreatedAt: time.Now(),
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UpdatedAt: time.Now(),
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}
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if use.param.DeliveryConfig.EnableHistory && use.param.HistoryRepo != nil {
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if err := use.param.HistoryRepo.CreateHistory(ctx, history); err != nil {
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_ = errs.DBErrorErrorL(use.param.Logger,
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[]errs.LogField{
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{Key: "type", Val: "sms"},
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{Key: "func", Val: "HistoryRepo.CreateHistory"},
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{Key: "err", Val: err.Error()},
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},
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"Failed to create SMS history")
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}
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}
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// 執行發送邏輯
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return use.sendWithRetry(ctx, history, &smsProviderAdapter{
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providers: use.param.SMSProviders,
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request: req,
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})
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}
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func (use *DeliveryUseCase) SendEmail(ctx context.Context, req usecase.MailReq) error {
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// 創建歷史記錄
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history := &entity.DeliveryHistory{
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Type: "email",
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Recipient: fmt.Sprintf("%v", req.To),
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Subject: req.Subject,
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Content: req.Body,
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Status: entity.DeliveryStatusPending,
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AttemptCount: 0,
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CreatedAt: time.Now(),
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UpdatedAt: time.Now(),
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}
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if use.param.DeliveryConfig.EnableHistory && use.param.HistoryRepo != nil {
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if err := use.param.HistoryRepo.CreateHistory(ctx, history); err != nil {
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_ = errs.DBErrorErrorL(use.param.Logger,
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[]errs.LogField{
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{Key: "type", Val: "email"},
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{Key: "func", Val: "HistoryRepo.CreateHistory"},
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{Key: "err", Val: err.Error()},
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},
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"Failed to create email history")
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}
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}
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// 執行發送邏輯
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return use.sendWithRetry(ctx, history, &emailProviderAdapter{
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providers: use.param.EmailProviders,
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request: req,
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})
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}
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// providerAdapter 統一的供應商適配器接口
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type providerAdapter interface {
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getProviderCount() int
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getProviderName(index int) string
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getProviderSort(index int) int64
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send(ctx context.Context, providerIndex int) error
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getType() string
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}
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// smsProviderAdapter SMS 供應商適配器
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type smsProviderAdapter struct {
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providers []usecase.SMSProvider
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request usecase.SMSMessageRequest
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}
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func (a *smsProviderAdapter) getProviderCount() int {
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return len(a.providers)
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}
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func (a *smsProviderAdapter) getProviderName(index int) string {
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return fmt.Sprintf("sms_provider_%d", index)
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}
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func (a *smsProviderAdapter) getProviderSort(index int) int64 {
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return a.providers[index].Sort
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}
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func (a *smsProviderAdapter) send(ctx context.Context, providerIndex int) error {
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return a.providers[providerIndex].Repo.SendSMS(ctx, repository.SMSMessageRequest{
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PhoneNumber: a.request.PhoneNumber,
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RecipientName: a.request.RecipientName,
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MessageContent: a.request.MessageContent,
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})
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}
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func (a *smsProviderAdapter) getType() string {
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return "SMS"
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}
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// emailProviderAdapter Email 供應商適配器
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type emailProviderAdapter struct {
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providers []usecase.EmailProvider
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request usecase.MailReq
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}
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func (a *emailProviderAdapter) getProviderCount() int {
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return len(a.providers)
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}
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func (a *emailProviderAdapter) getProviderName(index int) string {
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return fmt.Sprintf("email_provider_%d", index)
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}
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func (a *emailProviderAdapter) getProviderSort(index int) int64 {
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return a.providers[index].Sort
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}
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func (a *emailProviderAdapter) send(ctx context.Context, providerIndex int) error {
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return a.providers[providerIndex].Repo.SendMail(ctx, repository.MailReq{
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From: a.request.From,
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To: a.request.To,
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Subject: a.request.Subject,
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Body: a.request.Body,
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})
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}
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func (a *emailProviderAdapter) getType() string {
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return "Email"
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}
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// providerWithIndex 用於排序的結構
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type providerWithIndex struct {
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index int
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sort int64
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}
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// sendWithRetry 統一的發送重試邏輯
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func (use *DeliveryUseCase) sendWithRetry(
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ctx context.Context,
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history *entity.DeliveryHistory,
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adapter providerAdapter,
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) error {
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// 按 Sort 欄位對供應商進行排序
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providerCount := adapter.getProviderCount()
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sortedProviders := make([]providerWithIndex, providerCount)
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for i := 0; i < providerCount; i++ {
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sortedProviders[i] = providerWithIndex{
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index: i,
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sort: adapter.getProviderSort(i),
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}
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}
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sort.Slice(sortedProviders, func(i, j int) bool {
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return sortedProviders[i].sort < sortedProviders[j].sort
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})
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var lastErr error
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totalAttempts := 0
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// 嘗試所有 providers
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for _, provider := range sortedProviders {
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providerIndex := provider.index
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// 為每個 provider 嘗試發送
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for attempt := 0; attempt < use.param.DeliveryConfig.MaxRetries; attempt++ {
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totalAttempts++
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// 更新歷史記錄狀態
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history.Status = entity.DeliveryStatusSending
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history.Provider = adapter.getProviderName(providerIndex)
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history.AttemptCount = totalAttempts
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history.UpdatedAt = time.Now()
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use.updateHistory(ctx, history)
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// 記錄發送嘗試
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attemptStart := time.Now()
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// 創建帶超時的 context
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sendCtx, cancel := context.WithTimeout(ctx, use.param.DeliveryConfig.Timeout)
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err := adapter.send(sendCtx, providerIndex)
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cancel()
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// 記錄嘗試結果
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attemptDuration := time.Since(attemptStart)
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attemptRecord := entity.DeliveryAttempt{
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Provider: history.Provider,
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AttemptAt: attemptStart,
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Success: err == nil,
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ErrorMessage: "",
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Duration: attemptDuration.Milliseconds(),
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}
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if err != nil {
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attemptRecord.ErrorMessage = err.Error()
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lastErr = err
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_ = errs.SvcThirdPartyErrorL(use.param.Logger,
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[]errs.LogField{
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{Key: "type", Val: adapter.getType()},
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{Key: "attempt", Val: attempt + 1},
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{Key: "provider", Val: providerIndex},
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{Key: "err", Val: err.Error()},
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},
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fmt.Sprintf("%s send attempt %d failed for provider %d", adapter.getType(), attempt+1, providerIndex))
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// 如果不是最後一次嘗試，等待後重試
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if attempt < use.param.DeliveryConfig.MaxRetries-1 {
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delay := use.calculateDelay(attempt)
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history.Status = entity.DeliveryStatusRetrying
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use.updateHistory(ctx, history)
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use.addAttemptRecord(ctx, history.ID, attemptRecord)
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(delay):
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continue
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}
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}
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} else {
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// 發送成功
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history.Status = entity.DeliveryStatusSuccess
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history.UpdatedAt = time.Now()
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now := time.Now()
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history.CompletedAt = &now
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use.updateHistory(ctx, history)
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use.addAttemptRecord(ctx, history.ID, attemptRecord)
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// 成功發送不需要記錄錯誤，這裡可以選擇記錄信息日誌或直接返回
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return nil
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}
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use.addAttemptRecord(ctx, history.ID, attemptRecord)
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}
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}
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// 所有 providers 都失敗了
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history.Status = entity.DeliveryStatusFailed
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history.ErrorMessage = fmt.Sprintf("All providers failed. Last error: %v", lastErr)
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history.UpdatedAt = time.Now()
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now := time.Now()
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history.CompletedAt = &now
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use.updateHistory(ctx, history)
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return errs.SvcThirdPartyError(
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fmt.Sprintf("Failed to send %s after %d attempts across %d providers",
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adapter.getType(), totalAttempts, providerCount))
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}
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// calculateDelay 計算指數退避延遲
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func (use *DeliveryUseCase) calculateDelay(attempt int) time.Duration {
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delay := float64(use.param.DeliveryConfig.InitialDelay) * math.Pow(use.param.DeliveryConfig.BackoffFactor, float64(attempt))
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if delay > float64(use.param.DeliveryConfig.MaxDelay) {
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delay = float64(use.param.DeliveryConfig.MaxDelay)
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}
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return time.Duration(delay)
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}
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// updateHistory 更新歷史記錄
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func (use *DeliveryUseCase) updateHistory(ctx context.Context, history *entity.DeliveryHistory) {
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if use.param.DeliveryConfig.EnableHistory && use.param.HistoryRepo != nil {
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if err := use.param.HistoryRepo.UpdateHistory(ctx, history); err != nil {
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_ = errs.DBErrorErrorL(use.param.Logger,
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[]errs.LogField{
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{Key: "func", Val: "HistoryRepo.UpdateHistory"},
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{Key: "history_id", Val: history.ID},
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{Key: "err", Val: err.Error()},
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},
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"Failed to update delivery history")
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}
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}
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}
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// addAttemptRecord 添加發送嘗試記錄
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func (use *DeliveryUseCase) addAttemptRecord(ctx context.Context, historyID string, attempt entity.DeliveryAttempt) {
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if use.param.DeliveryConfig.EnableHistory && use.param.HistoryRepo != nil {
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if err := use.param.HistoryRepo.AddAttempt(ctx, historyID, attempt); err != nil {
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_ = errs.DBErrorErrorL(use.param.Logger,
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[]errs.LogField{
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{Key: "func", Val: "HistoryRepo.AddAttempt"},
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{Key: "history_id", Val: historyID},
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{Key: "err", Val: err.Error()},
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},
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"Failed to add attempt record")
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}
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}
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}
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