Support the pipeline serialization

internal/interactor/_mock.sh

@@ -7,6 +7,7 @@ github.com/gitploy-io/gitploy/internal/interactor=user.go\
 ,github.com/gitploy-io/gitploy/internal/interactor=deploymentstatistics.go\
 ,github.com/gitploy-io/gitploy/internal/interactor=lock.go\
 ,github.com/gitploy-io/gitploy/internal/interactor=event.go\
+,github.com/gitploy-io/gitploy/internal/interactor=review.go\
     -source ./interface.go \
     -package mock \
     -destination ./mock/pkg.go

internal/interactor/deployment.go

@@ -27,6 +27,7 @@ type (
 		FindDeploymentByID(ctx context.Context, id int) (*ent.Deployment, error)
 		FindDeploymentByUID(ctx context.Context, uid int64) (*ent.Deployment, error)
 		FindDeploymentOfRepoByNumber(ctx context.Context, r *ent.Repo, number int) (*ent.Deployment, error)
+		FindPrevRunningDeployment(ctx context.Context, d *ent.Deployment) (*ent.Deployment, error)
 		FindPrevSuccessDeployment(ctx context.Context, d *ent.Deployment) (*ent.Deployment, error)
 		GetNextDeploymentNumberOfRepo(ctx context.Context, r *ent.Repo) (int, error)
 		CreateDeployment(ctx context.Context, d *ent.Deployment) (*ent.Deployment, error)
@@ -71,21 +72,12 @@ type (
 // But if it requires a review, it saves the payload on the store and waits until reviewed.
 // It returns an error for a undeployable payload.
 func (i *DeploymentInteractor) Deploy(ctx context.Context, u *ent.User, r *ent.Repo, d *ent.Deployment, env *extent.Env) (*ent.Deployment, error) {
-	i.log.Debug("Validate the request.")
-	v := NewDeploymentValidator([]Validator{
-		&RefValidator{Env: env},
-		&FrozenWindowValidator{Env: env},
-		&LockValidator{Repo: r, Store: i.store},
-	})
-	if err := v.Validate(d); err != nil {
-		return nil, err
-	}
-
 	number, err := i.store.GetNextDeploymentNumberOfRepo(ctx, r)
 	if err != nil {
 		return nil, e.NewError(e.ErrorCodeInternalError, err)
 	}
 
+	i.log.Debug("Get the next number, and build the deployment.")
 	d = &ent.Deployment{
 		Number:                number,
 		Type:                  d.Type,
@@ -98,6 +90,17 @@ func (i *DeploymentInteractor) Deploy(ctx context.Context, u *ent.User, r *ent.R
 		RepoID:                r.ID,
 	}
 
+	i.log.Debug("Validate the deployment before a request.")
+	v := NewDeploymentValidator([]Validator{
+		&RefValidator{Env: env},
+		&FrozenWindowValidator{Env: env},
+		&LockValidator{Repo: r, Store: i.store},
+		&SerializationValidator{Env: env, Store: i.store},
+	})
+	if err := v.Validate(d); err != nil {
+		return nil, err
+	}
+
 	if env.HasReview() {
 		i.log.Debug("Save the deployment to wait reviews.")
 		d, err = i.store.CreateDeployment(ctx, d)
@@ -199,12 +202,13 @@ func (i *DeploymentInteractor) requestReviews(ctx context.Context, u *ent.User,
 // after review has finished.
 // It returns an error for a undeployable payload.
 func (i *DeploymentInteractor) DeployToRemote(ctx context.Context, u *ent.User, r *ent.Repo, d *ent.Deployment, env *extent.Env) (*ent.Deployment, error) {
-	i.log.Debug("Validate the request.")
+	i.log.Debug("Validate the deployment before a request.")
 	v := NewDeploymentValidator([]Validator{
 		&StatusValidator{Status: deployment.StatusWaiting},
 		&RefValidator{Env: env},
 		&FrozenWindowValidator{Env: env},
 		&LockValidator{Repo: r, Store: i.store},
+		&SerializationValidator{Env: env, Store: i.store},
 		&ReviewValidator{Store: i.store},
 	})
 	if err := v.Validate(d); err != nil {

internal/interactor/validator.go

@@ -9,6 +9,7 @@ import (
 	"github.com/gitploy-io/gitploy/model/ent/review"
 	"github.com/gitploy-io/gitploy/model/extent"
 	"github.com/gitploy-io/gitploy/pkg/e"
+	"go.uber.org/zap"
 )
 
 // DeploymentValidator validate that it is deployable.
@@ -137,3 +138,33 @@ func (v *ReviewValidator) Validate(d *ent.Deployment) error {
 
 	return e.NewError(e.ErrorCodeDeploymentNotApproved, nil)
 }
+
+// SerializationValidator verify if there is currently a running deployment
+// for the environment.
+type SerializationValidator struct {
+	Env   *extent.Env
+	Store DeploymentStore
+}
+
+func (v *SerializationValidator) Validate(d *ent.Deployment) error {
+	log := zap.L().Named("serialization-validator")
+	defer log.Sync()
+
+	// Skip if the serialization field is disabled.
+	if v.Env.Serialization == nil || !*v.Env.Serialization {
+		log.Debug("Skip the serialization validator.")
+		return nil
+	}
+
+	d, err := v.Store.FindPrevRunningDeployment(context.Background(), d)
+	if d != nil {
+		return e.NewError(e.ErrorCodeDeploymentSerialization, nil)
+	}
+
+	if e.HasErrorCode(err, e.ErrorCodeEntityNotFound) {
+		log.Debug("There is no running deployment.")
+		return nil
+	}
+
+	return err
+}

internal/interactor/validator_test.go

@@ -102,3 +102,39 @@ func TestReviewValidator_Validate(t *testing.T) {
 		}
 	})
 }
+
+func TestSerializationValidator_Validate(t *testing.T) {
+	t.Run("Returns nil if the serialization is empty.", func(t *testing.T) {
+		ctrl := gomock.NewController(t)
+		store := mock.NewMockStore(ctrl)
+
+		v := &i.SerializationValidator{
+			Env:   &extent.Env{},
+			Store: store,
+		}
+
+		if err := v.Validate(&ent.Deployment{}); err != nil {
+			t.Fatalf("Validate returns an error: %v", err)
+		}
+	})
+
+	t.Run("Returns an deployment_serialization error if there is a running deployment.", func(t *testing.T) {
+		t.Log("Start mocking:")
+		ctrl := gomock.NewController(t)
+		store := mock.NewMockStore(ctrl)
+
+		t.Log("Return a running deployment.")
+		store.EXPECT().
+			FindPrevRunningDeployment(gomock.Any(), gomock.AssignableToTypeOf(&ent.Deployment{})).
+			Return(&ent.Deployment{}, nil)
+
+		v := &i.SerializationValidator{
+			Env:   &extent.Env{Serialization: pointer.ToBool(true)},
+			Store: store,
+		}
+
+		if err := v.Validate(&ent.Deployment{}); !e.HasErrorCode(err, e.ErrorCodeDeploymentSerialization) {
+			t.Fatalf("Error is not deployment_serialization: %v", err)
+		}
+	})
+}

internal/pkg/store/deployment.go

@@ -208,6 +208,32 @@ func (s *Store) GetNextDeploymentNumberOfRepo(ctx context.Context, r *ent.Repo)
 	return cnt + 1, nil
 }
 
+// FindPrevRunningDeployment find a deployment of which the status is created, queued, or running.
+func (s *Store) FindPrevRunningDeployment(ctx context.Context, d *ent.Deployment) (*ent.Deployment, error) {
+	d, err := s.c.Deployment.
+		Query().
+		Where(
+			deployment.And(
+				deployment.RepoIDEQ(d.RepoID),
+				deployment.EnvEQ(d.Env),
+				deployment.StatusIn(
+					deployment.StatusCreated,
+					deployment.StatusQueued,
+					deployment.StatusRunning,
+				),
+			),
+		).
+		Order(ent.Desc(deployment.FieldCreatedAt)).
+		First(ctx)
+	if ent.IsNotFound(err) {
+		return nil, e.NewErrorWithMessage(e.ErrorCodeEntityNotFound, "The deployment is not found.", err)
+	} else if err != nil {
+		return nil, e.NewError(e.ErrorCodeInternalError, err)
+	}
+
+	return d, nil
+}
+
 func (s *Store) FindPrevSuccessDeployment(ctx context.Context, d *ent.Deployment) (*ent.Deployment, error) {
 	d, err := s.c.Deployment.
 		Query().