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request_handler.go
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/
request_handler.go
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package reminder
import (
"context"
"encoding/json"
commonaggregate "github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/domain/common/aggregate"
"time"
"github.com/openline-ai/openline-customer-os/packages/server/customer-os-common-module/utils"
"github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/config"
"github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/eventstore"
"github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/logger"
"github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/tracing"
reminderpb "github.com/openline-ai/openline-customer-os/packages/server/events-processing-proto/gen/proto/go/api/grpc/v1/reminder"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/log"
"github.com/pkg/errors"
)
type ReminderRequestHandler interface {
Handle(ctx context.Context, tenant, objectId string, request any, params ...map[string]any) (any, error)
HandleWithRetry(ctx context.Context, tenant, objectId string, aggregateRequired bool, request any, params ...map[string]any) (any, error)
}
type reminderRequestHandler struct {
log logger.Logger
es eventstore.AggregateStore
cfg config.Utils
ebs *eventstore.EventBufferService
}
func NewReminderRequestHandler(log logger.Logger, es eventstore.AggregateStore, ebs *eventstore.EventBufferService, cfg config.Utils) ReminderRequestHandler {
return &reminderRequestHandler{log: log, es: es, ebs: ebs, cfg: cfg}
}
func (h *reminderRequestHandler) Handle(ctx context.Context, tenant, objectId string, request any, params ...map[string]any) (any, error) {
span, ctx := opentracing.StartSpanFromContext(ctx, "ReminderRequestHandler.Handle")
defer span.Finish()
span.SetTag(tracing.SpanTagTenant, tenant)
tracing.LogObjectAsJson(span, "request", request)
if len(params) > 0 {
span.LogFields(log.Object("params", params))
}
reminderAggregate, err := LoadReminderAggregate(ctx, h.es, tenant, objectId, *eventstore.NewLoadAggregateOptions())
if err != nil {
tracing.TraceErr(span, err)
return nil, err
}
var requestParams map[string]any
if len(params) > 0 {
requestParams = params[0]
}
result, err := reminderAggregate.HandleRequest(ctx, request, requestParams)
if err != nil {
tracing.TraceErr(span, err)
return nil, err
}
req := request.(*reminderpb.CreateReminderGrpcRequest)
if err := h.createAndParkReminderNotification(ctx, reminderAggregate, req.LoggedInUserId, req.OrganizationId, reminderAggregate.GetID(), req.SourceFields.AppSource, req.Content, req.DueDate.AsTime().UTC()); err != nil {
tracing.TraceErr(span, err)
return nil, err
}
return result, h.es.Save(ctx, reminderAggregate)
}
func (h *reminderRequestHandler) HandleWithRetry(ctx context.Context, tenant, objectId string, aggregateRequired bool, request any, params ...map[string]any) (any, error) {
span, ctx := opentracing.StartSpanFromContext(ctx, "ReminderRequestHandler.HandleWithRetry")
defer span.Finish()
span.SetTag(tracing.SpanTagTenant, tenant)
tracing.LogObjectAsJson(span, "request", request)
span.LogFields(log.Bool("aggregateRequired", aggregateRequired))
if len(params) > 0 {
span.LogFields(log.Object("params", params))
}
for attempt := 0; attempt == 0 || attempt < h.cfg.RetriesOnOptimisticLockException; attempt++ {
reminderAggregate, err := LoadReminderAggregate(ctx, h.es, tenant, objectId, *eventstore.NewLoadAggregateOptions())
if err != nil {
tracing.TraceErr(span, err)
return nil, err
}
if aggregateRequired && eventstore.IsAggregateNotFound(reminderAggregate) {
tracing.TraceErr(span, eventstore.ErrAggregateNotFound)
return nil, eventstore.ErrAggregateNotFound
}
var requestParams map[string]any
if len(params) > 0 {
requestParams = params[0]
}
result, err := reminderAggregate.HandleRequest(ctx, request, requestParams)
if err != nil {
tracing.TraceErr(span, err)
return nil, err
}
err = h.es.Save(ctx, reminderAggregate)
if err == nil {
if reminderAggregate.Reminder.Dismissed {
err := h.deleteParkedReminderNotification(ctx, reminderAggregate.GetID())
if err != nil {
tracing.TraceErr(span, err)
return nil, err
}
} else {
if err := h.updateParkedReminderNotification(ctx, reminderAggregate, reminderAggregate.GetID(), request); err != nil {
tracing.TraceErr(span, err)
return nil, err
}
}
return result, nil // Save successful
}
if eventstore.IsEventStoreErrorCodeWrongExpectedVersion(err) {
// Handle concurrency error
if attempt == h.cfg.RetriesOnOptimisticLockException-1 {
// If we have reached the maximum number of retries, return an error
tracing.TraceErr(span, err)
return nil, err
}
span.LogFields(log.Int("retryAttempt", attempt+1))
time.Sleep(utils.BackOffExponentialDelay(attempt)) // backoffDelay is a function that increases the delay with each attempt
continue // Retry
} else {
// Some other error occurred
tracing.TraceErr(span, err)
return nil, err
}
}
err := errors.New("reached maximum number of retries")
tracing.TraceErr(span, err)
return nil, err
}
func (h *reminderRequestHandler) createAndParkReminderNotification(ctx context.Context, agg *ReminderAggregate, userId, organizationId, reminderId, appSource, content string, createdAt time.Time) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "ReminderRequestHandler.createAndParkReminderNotification")
defer span.Finish()
if agg.Reminder.DueDate.Before(utils.Now()) {
return nil
}
// create notification event and Park it in the event buffer for notifications
event, err := createNotificationEvent(ctx, agg, userId, organizationId, appSource, content, createdAt)
if err != nil {
tracing.TraceErr(span, err)
return err
}
dueDate := agg.Reminder.DueDate.UTC() // when buffer should dispatch reminder notification event
err = h.ebs.Park(*event, agg.GetTenant(), reminderId, dueDate)
if err != nil {
tracing.TraceErr(span, err)
return err
}
return nil
}
func (h *reminderRequestHandler) updateParkedReminderNotification(ctx context.Context, agg *ReminderAggregate, reminderId string, request any) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "ReminderRequestHandler.updateParkedReminderNotification")
defer span.Finish()
req, ok := request.(*reminderpb.UpdateReminderGrpcRequest)
if !ok {
return nil
}
if agg.Reminder.DueDate.Before(utils.Now()) {
return nil
}
parkedReminder, err := h.ebs.GetById(reminderId)
if err != nil {
tracing.TraceErr(span, err)
return err
}
//if reminder is missing, we recreate it
if parkedReminder == nil {
err := h.createAndParkReminderNotification(ctx, agg, req.LoggedInUserId, agg.Reminder.OrganizationID, reminderId, req.AppSource, req.Content, agg.Reminder.CreatedAt)
if err != nil {
tracing.TraceErr(span, err)
return err
}
return nil
}
var parkedReminderEventData ReminderNotificationEvent
if err := json.Unmarshal(parkedReminder.EventData, &parkedReminderEventData); err != nil {
tracing.TraceErr(span, err)
return err
}
parkedReminderEventData.Content = req.Content
parkedReminder.ExpiryTimestamp = agg.Reminder.DueDate.UTC()
parkedReminder.EventData, err = json.Marshal(parkedReminderEventData)
if err != nil {
tracing.TraceErr(span, err)
return err
}
err = h.ebs.Update(parkedReminder)
if err != nil {
tracing.TraceErr(span, err)
return err
}
return nil
}
func (h *reminderRequestHandler) deleteParkedReminderNotification(ctx context.Context, reminderId string) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "ReminderRequestHandler.deleteParkedReminderNotification")
defer span.Finish()
parkedReminder, err := h.ebs.GetById(reminderId)
if err != nil {
tracing.TraceErr(span, err)
return err
}
if parkedReminder == nil {
return nil
}
err = h.ebs.Delete(parkedReminder)
if err != nil {
tracing.TraceErr(span, err)
return err
}
return nil
}
func createNotificationEvent(ctx context.Context, agg *ReminderAggregate, loggedInUserId, organizationId, appSource, content string, reminderCreatedAt time.Time) (*eventstore.Event, error) {
span, ctx := opentracing.StartSpanFromContext(ctx, "createNotificationEvent")
defer span.Finish()
tenant := agg.GetTenant()
tracing.SetCommandHandlerSpanTags(ctx, span, tenant, loggedInUserId)
event, err := NewReminderNotificationEvent(
agg,
loggedInUserId,
organizationId,
content,
reminderCreatedAt)
if err != nil {
tracing.TraceErr(span, err)
return nil, errors.Wrap(err, "NewOrganizationOwnerUpdateNotificationEvent")
}
commonaggregate.EnrichEventWithMetadataExtended(&event, span, commonaggregate.EventMetadata{
Tenant: tenant,
UserId: loggedInUserId,
App: appSource,
})
return &event, nil
}