WIP: Spec for Phase 2 Plugins

Signed-off-by: Rashmi Gottipati <[email protected]>

pkg/externalplugin/types.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package externalplugin
+
+// PluginRequest contains all information kubebuilder received from the CLI
+// and plugins executed before it.
+type PluginRequest struct {
+	// Command contains the command to be executed by the plugin such as init, create api, etc.
+	Command string `json:"command"`
+
+	// APIVersion defines the versioned schema of PluginRequest that is being sent from Kubebuilder.
+	// Initially, this will be marked as alpha (v1alpha1).
+	APIVersion string `json:"apiVersion"`
+
+	// Args holds the plugin specific arguments that are received from the CLI
+	// which are to be passed down to the external plugin.
+	Args []string `json:"args"`
+
+	// Universe represents the modified file contents that gets updated over a series of plugin runs
+	// across the plugin chain. Initially, it starts out as empty.
+	Universe map[string]string `json:"universe"`
+}
+
+// PluginResponse is returned to kubebuilder by the plugin and contains all files
+// written by the plugin following a certain command.
+type PluginResponse struct {
+	// Command holds the command that gets executed by the plugin such as init, create api, etc.
+	Command string `json:"command"`
+
+	// Help contains the plugin specific help text that the plugin returns to Kubebuilder when it receives
+	// `--help` flag from Kubebuilder.
+	Help string `json:"help"`
+
+	// APIVersion defines the versioned schema of the PluginResponse that is back sent back to Kubebuilder.
+	// Initially, this will be marked as alpha (v1alpha1)
+	APIVersion string `json:"apiVersion"`
+
+	// Universe in the PluginResponse represents the updated file contents that was written by the plugin.
+	Universe map[string]string `json:"universe"`
+
+	// Error is a boolean type that indicates whether there were any errors due to plugin failures.
+	Error bool `json:"error,omitempty"`
+
+	// ErrorMsg contains the specific error message of the plugin failures.
+	ErrorMsg string `json:"error_msg,omitempty"`
+}