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handler.go
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handler.go
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package events
import (
"context"
"encoding/json"
"github.com/google/uuid"
"cloud.google.com/go/datastore"
"github.com/micro/go-micro/v2/broker"
log "github.com/micro/go-micro/v2/logger"
"github.com/enakai00/go-micro-gcp-example/purchase/ds"
purchase "github.com/enakai00/go-micro-gcp-example/purchase/proto/purchase"
)
func getUUID() string {
uuid, _ := uuid.NewRandom()
return uuid.String()
}
func handlePurchaseOrderTicket(purchaseOrderTicket purchase.OrderTicket) error {
newStatus := purchaseOrderTicket.Status
orderid := purchaseOrderTicket.Orderid
query := datastore.NewQuery("OrderTicket").Filter("orderid =", orderid)
query = query.Limit(1).KeysOnly()
keys, err := client.GetAll(context.Background(), query, nil)
if err != nil {
return err
}
if len(keys) == 0 {
log.Errorf("Order with orderid %s doen't exist.", orderid)
return nil
}
_, err = client.RunInTransaction(context.Background(),
func(tx *datastore.Transaction) error {
var orderTicket ds.OrderTicket
err := tx.Get(keys[0], &orderTicket)
if err != nil {
return err
}
if newStatus == "reserve_failed" && orderTicket.Status == "pre-approved" {
orderTicket.Status = "reserve_failed"
_, err := tx.Put(orderTicket.Key, &orderTicket)
if err != nil {
return err
}
return nil
}
if newStatus == "reserved" && orderTicket.Status == "pre-approved" {
orderTicket.Status = "reserved"
_, err := tx.Put(orderTicket.Key, &orderTicket)
if err != nil {
return err
}
return nil
}
if newStatus == "paid" {
orderTicket.Status = "approved"
_, err := tx.Put(orderTicket.Key, &orderTicket)
if err != nil {
return err
}
purchaseOrderTicket.Status = "approved"
RegisterEvent(purchaseOrderTicket,
"purchase.OrderTicket",
tx)
if err != nil {
return err
}
return nil
}
return nil
})
if err != nil {
return err
}
PublishEvents()
return nil
}
func eventHandler(p broker.Event) error {
header := p.Message().Header
eventid := header["eventid"]
eventType := header["type"]
duplicate, err := isDuplicated(eventid)
if err != nil {
log.Fatalf("Error checking duplicated event: %v", err)
}
if duplicate {
p.Ack()
return nil
}
switch eventType {
case "purchase.OrderTicket":
var purchaseOrderTicket purchase.OrderTicket
err := json.Unmarshal(p.Message().Body, &purchaseOrderTicket)
if err != nil {
log.Fatalf("Error unmarshalling eventt: %v", err)
}
log.Infof("Handle event purchase.OrderTicket: %v", purchaseOrderTicket)
err = handlePurchaseOrderTicket(purchaseOrderTicket)
if err != nil {
log.Warnf("Failed to handle purchaseOrderTicke: %v", err)
} else {
recordEvent(eventid)
p.Ack()
}
default:
log.Infof("Unknown event type: %s", eventType)
recordEvent(eventid)
p.Ack()
}
return nil
}