Implement notifications service with shared messaging and email drivers (#36)

backend/notifications/transport/mapper.go

@@ -0,0 +1,46 @@
+package transport
+
+import (
+	"time"
+
+	pb "git.sendico.io/tech/sxchnge/notifications/interface/notifications/v1"
+	"git.sendico.io/tech/sxchnge/notifications/model"
+	merrors "git.sendico.io/tech/sxchnge/shared/errors"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+func request(r *pb.SendRequest) (model.Request, error) {
+	if r == nil || len(r.Targets) != 1 {
+		return model.Request{}, merrors.InvalidArgument("exactly one email target is required")
+	}
+	target := r.Targets[0]
+	if target == nil || target.Destination == nil {
+		return model.Request{}, merrors.InvalidArgument("missing destination")
+	}
+	email, ok := target.Destination.(*pb.Target_Email)
+	if !ok {
+		return model.Request{}, merrors.NotImplemented("channel is not implemented")
+	}
+	if email.Email == nil {
+		return model.Request{}, merrors.InvalidArgument("missing email target")
+	}
+	var expiry time.Time
+	if r.ExpiresAt != nil {
+		if err := r.ExpiresAt.CheckValid(); err != nil {
+			return model.Request{}, merrors.InvalidArgument("invalid expiry")
+		}
+		expiry = r.ExpiresAt.AsTime()
+	}
+	return model.Request{Key: r.IdempotencyKey, UserID: r.UserId, TemplateID: r.TemplateId, TemplateVersion: r.TemplateVersion, Parameters: r.Parameters, Locale: r.Locale, Address: email.Email.Address, ExpiresAt: expiry}, nil
+}
+func response(n *model.Notification) *pb.Notification {
+	states := map[model.State]pb.DeliveryState{model.Queued: pb.DeliveryState_DELIVERY_STATE_QUEUED, model.Sending: pb.DeliveryState_DELIVERY_STATE_SENDING, model.RetryWait: pb.DeliveryState_DELIVERY_STATE_RETRY_WAIT, model.Accepted: pb.DeliveryState_DELIVERY_STATE_ACCEPTED, model.Failed: pb.DeliveryState_DELIVERY_STATE_FAILED, model.Expired: pb.DeliveryState_DELIVERY_STATE_EXPIRED, model.Unknown: pb.DeliveryState_DELIVERY_STATE_UNKNOWN}
+	d := &pb.Delivery{Id: n.ID.Hex() + "-email", Channel: pb.Channel_CHANNEL_EMAIL, State: states[n.State], AttemptCount: n.Attempts, UpdatedAt: timestamppb.New(n.UpdatedAt)}
+	if n.FailureCode != "" {
+		d.Failure = &pb.Failure{Code: n.FailureCode, Message: "See the documented delivery failure code."}
+	}
+	if n.State == model.Queued || n.State == model.RetryWait {
+		d.NextAttemptAt = timestamppb.New(n.NextAttemptAt)
+	}
+	return &pb.Notification{Id: n.ID.Hex(), UserId: n.UserID, TemplateId: n.TemplateID, TemplateVersion: n.TemplateVersion, Deliveries: []*pb.Delivery{d}, CreatedAt: timestamppb.New(n.CreatedAt), UpdatedAt: timestamppb.New(n.UpdatedAt), ExpiresAt: timestamppb.New(n.ExpiresAt)}
+}