add control package, reorganize some files and packages

control/environments/docker.go

@@ -0,0 +1,21 @@
+package environments
+
+type DockerEnvironment struct {
+	BaseEnvironment
+}
+
+// Ensure DockerEnvironment implements Environment
+var _ Environment = &DockerEnvironment{}
+
+func NewDockerEnvironment() *DockerEnvironment {
+	return &DockerEnvironment{}
+}
+
+func (env *DockerEnvironment) Exec() error {
+	return nil
+}
+
+func (env *DockerEnvironment) Create() error {
+
+	return nil
+}

control/environments/environment.go

@@ -0,0 +1,50 @@
+package environments
+
+// Environment provides abstraction of different environments
+type Environment interface {
+	// Execute a command in the environment
+	Exec() error
+
+	// Create creates the environment
+	Create() error
+
+	// Destroy destroys the environment
+	Destroy() error
+
+	// Exists checks wether the Environment exists or not
+	Exists() bool
+
+	// ReCreate recreates the environment by first Destroying and then Creating
+	ReCreate() error
+}
+
+type BaseEnvironment struct {
+}
+
+// Ensure BaseEnvironment implements Environment
+var _ Environment = &BaseEnvironment{}
+
+func (env *BaseEnvironment) Create() error {
+	return nil
+}
+
+func (env *BaseEnvironment) Destroy() error {
+	return nil
+}
+
+func (env *BaseEnvironment) Exists() bool {
+	return false
+}
+
+func (env *BaseEnvironment) ReCreate() error {
+	if env.Exists() {
+		if err := env.Destroy(); err != nil {
+			return err
+		}
+	}
+	return env.Create()
+}
+
+func (env *BaseEnvironment) Exec() error {
+	return nil
+}