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service.go
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service.go
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package inform
import (
"context"
"fmt"
"time"
"github.com/airenas/async-api/pkg/inform"
amessages "github.com/airenas/async-api/pkg/messages"
"github.com/airenas/go-app/pkg/goapp"
"github.com/airenas/roxy/internal/pkg/messages"
"github.com/airenas/roxy/internal/pkg/persistence"
"github.com/airenas/roxy/internal/pkg/utils"
"github.com/airenas/roxy/internal/pkg/utils/handler"
"github.com/jordan-wright/email"
"github.com/vgarvardt/gue/v5"
)
// Sender send emails
type Sender interface {
Send(email *email.Email) error
}
// EmailMaker prepares the email
type EmailMaker interface {
Make(data *inform.Data) (*email.Email, error)
}
// EmailRetriever return the email by ID
type EmailRetriever interface {
GetEmail(ID string) (string, error)
}
// DB tracks email sending process
// It is used to quarantee not to send the emails twice
type DB interface {
LockEmailTable(context.Context, string, string) error
UnLockEmailTable(context.Context, string, string, int) error
LoadRequest(ctx context.Context, id string) (*persistence.ReqData, error)
}
// MsgSender provides send msg functionality
type MsgSender interface {
SendMessage(context.Context, amessages.Message, messages.Options) error
}
// ServiceData keeps data required for service work
type ServiceData struct {
GueClient *gue.Client
WorkerCount int
EmailSender Sender
EmailMaker EmailMaker
DB DB
Location *time.Location
}
// StartWorkerService starts the event queue listener service to listen for inform events
// returns channel for tracking when all jobs are finished
func StartWorkerService(ctx context.Context, data *ServiceData) (chan struct{}, error) {
if err := validate(data); err != nil {
return nil, err
}
goapp.Log.Info().Int("workers", data.WorkerCount).Str("queue", messages.Inform).Msg("Starting listen for messages")
wm := gue.WorkMap{
messages.Inform: handler.Create(data, handleInform, handler.DefaultOpts[amessages.InformMessage]()),
}
pool, err := gue.NewWorkerPool(
data.GueClient, wm, data.WorkerCount,
gue.WithPoolQueue(messages.Inform),
gue.WithPoolLogger(utils.NewGueLoggerAdapter()),
gue.WithPoolPollInterval(500*time.Millisecond),
gue.WithPoolPollStrategy(gue.RunAtPollStrategy),
gue.WithPoolID("asr-inform"),
)
if err != nil {
return nil, fmt.Errorf("could not build gue workers pool: %w", err)
}
res := make(chan struct{}, 1)
go func() {
goapp.Log.Info().Msg("Starting workers")
if err := pool.Run(ctx); err != nil {
goapp.Log.Error().Err(err).Msg("pool error")
}
goapp.Log.Info().Msg("Pool workers finished")
res <- struct{}{}
}()
return res, nil
}
func handleInform(ctx context.Context, m *amessages.InformMessage, data *ServiceData) error {
goapp.Log.Info().Str("ID", m.ID).Msg("handling")
mailData := inform.Data{}
mailData.ID = m.ID
mailData.MsgTime = toLocalTime(data, m.At)
mailData.MsgType = m.Type
var err error
req, err := data.DB.LoadRequest(ctx, m.ID)
if err != nil {
return fmt.Errorf("can't retrieve email: %w", err)
}
if req.Email.String == "" {
goapp.Log.Info().Msg("No email, skip")
return nil
}
mailData.Email = req.Email.String
email, err := data.EmailMaker.Make(&mailData)
if err != nil {
return fmt.Errorf("can't prepare email: %w", err)
}
err = data.DB.LockEmailTable(ctx, mailData.ID, mailData.MsgType)
if err != nil {
return fmt.Errorf("can't lock mail table: %w", err)
}
var unlockValue = 0
defer func(val *int) {
err := data.DB.UnLockEmailTable(ctx, mailData.ID, mailData.MsgType, *val)
if err != nil {
goapp.Log.Error().Err(err).Send()
}
}(&unlockValue)
err = data.EmailSender.Send(email)
if err != nil {
return fmt.Errorf("can't send email: %w", err)
}
unlockValue = 2
return nil
}
func validate(data *ServiceData) error {
if data.GueClient == nil {
return fmt.Errorf("no gue client")
}
if data.WorkerCount < 1 {
return fmt.Errorf("no worker count provided")
}
if data.EmailMaker == nil {
return fmt.Errorf("no EmailMaker")
}
if data.EmailSender == nil {
return fmt.Errorf("no EmailSender")
}
if data.DB == nil {
return fmt.Errorf("no DB")
}
return nil
}
func toLocalTime(data *ServiceData, t time.Time) time.Time {
if data.Location != nil {
return t.In(data.Location)
}
return t
}