Sketch out generator interface.

api/v1alpha1/applicationset_types.go

@@ -45,7 +45,7 @@ type ApplicationSetTemplate struct {
 
 // ApplicationSetGenerator include list item info
 type ApplicationSetGenerator struct {
-	List     *ListGenerator    `json:"list, omitempty"`
+	List     *ListGenerator    `json:"list,omitempty"`
 	Clusters *ClusterGenerator `json:"clusters,omitempty"`
 }
 

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/sergi/go-diff v1.1.0 // indirect
+	github.com/sirupsen/logrus v1.4.2
 	github.com/yudai/gojsondiff v1.0.1-0.20180504020246-0525c875b75c // indirect
 	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect
 	github.com/yudai/pp v2.0.1+incompatible // indirect

pkg/generators/cluster.go

@@ -0,0 +1,27 @@
+package generators
+
+import (
+	"fmt"
+	argoprojiov1alpha1 "github.com/argoproj-labs/applicationset/api/v1alpha1"
+	argov1alpha1 "github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
+)
+
+var _ Generator = (*ClusterGenerator)(nil)
+
+// ClusterGenerator generates Applications for some or all clusters registered with ArgoCD.
+type ClusterGenerator struct {
+}
+
+func NewClusterGenerator() Generator {
+	// TODO: pass client or informer for access to cluster secrets
+	g := &ClusterGenerator{}
+	return g
+}
+
+func (g *ClusterGenerator) GenerateApplications(appSet *argoprojiov1alpha1.ApplicationSet) ([]argov1alpha1.Application, error) {
+	if appSet == nil {
+		return nil, fmt.Errorf("ApplicationSet is empty")
+	}
+
+	return nil, nil
+}

pkg/generators/interface.go

@@ -0,0 +1,14 @@
+package generators
+
+import (
+	argoprojiov1alpha1 "github.com/argoproj-labs/applicationset/api/v1alpha1"
+	argov1alpha1 "github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
+)
+
+// Generator defines the interface implemented by all ApplicationSet generators.
+type Generator interface {
+	// GenerateApplications interprets the ApplicationSet and generates all relevant Applications.
+	// The expected / desired list of Applications is returned, it then needs to be reconciled
+	// against the current state of the Applications in the cluster.
+	GenerateApplications(appSet *argoprojiov1alpha1.ApplicationSet) ([]argov1alpha1.Application, error)
+}

pkg/generators/list.go

@@ -0,0 +1,25 @@
+package generators
+
+import (
+	"fmt"
+	argoprojiov1alpha1 "github.com/argoproj-labs/applicationset/api/v1alpha1"
+	argov1alpha1 "github.com/argoproj/argo-cd/pkg/apis/application/v1alpha1"
+)
+
+var _ Generator = (*ListGenerator)(nil)
+
+type ListGenerator struct {
+}
+
+func NewListGenerator() Generator {
+	g := &ListGenerator{}
+	return g
+}
+
+func (g *ListGenerator) GenerateApplications(appSet *argoprojiov1alpha1.ApplicationSet) ([]argov1alpha1.Application, error) {
+	if appSet == nil {
+		return nil, fmt.Errorf("ApplicationSet is empty")
+	}
+
+	return nil, nil
+}