inlet/outlet: add compile-time interface implementation check

For "plugins" only.

inlet/flow/input/file/root.go

@@ -22,12 +22,17 @@ import (
 type Input struct {
 	r      *reporter.Reporter
 	t      tomb.Tomb
-	config *Configuration
+	config Configuration
 	send   input.SendFunc
 }
 
+var (
+	_ input.Input         = &Input{}
+	_ input.Configuration = Configuration{}
+)
+
 // New instantiate a new UDP listener from the provided configuration.
-func (configuration *Configuration) New(r *reporter.Reporter, daemon daemon.Component, send input.SendFunc) (input.Input, error) {
+func (configuration Configuration) New(r *reporter.Reporter, daemon daemon.Component, send input.SendFunc) (input.Input, error) {
 	if len(configuration.Paths) == 0 {
 		return nil, errors.New("no paths provided for file input")
 	}

inlet/flow/input/udp/root.go

@@ -25,7 +25,7 @@ import (
 type Input struct {
 	r      *reporter.Reporter
 	t      tomb.Tomb
-	config *Configuration
+	config Configuration
 
 	metrics struct {
 		bytes         *reporter.CounterVec
@@ -40,8 +40,13 @@ type Input struct {
 	send    input.SendFunc // function to send to kafka
 }
 
+var (
+	_ input.Input         = &Input{}
+	_ input.Configuration = Configuration{}
+)
+
 // New instantiate a new UDP listener from the provided configuration.
-func (configuration *Configuration) New(r *reporter.Reporter, daemon daemon.Component, send input.SendFunc) (input.Input, error) {
+func (configuration Configuration) New(r *reporter.Reporter, daemon daemon.Component, send input.SendFunc) (input.Input, error) {
 	input := &Input{
 		r:      r,
 		config: configuration,

outlet/metadata/provider/gnmi/root.go

@@ -24,6 +24,11 @@ type Provider struct {
 	refresh   chan bool
 }
 
+var (
+	_ provider.Provider      = &Provider{}
+	_ provider.Configuration = Configuration{}
+)
+
 // New creates a new gNMI provider from configuration
 func (configuration Configuration) New(r *reporter.Reporter) (provider.Provider, error) {
 	p := Provider{

outlet/metadata/provider/snmp/root.go

@@ -28,6 +28,11 @@ type Provider struct {
 	}
 }
 
+var (
+	_ provider.Provider      = &Provider{}
+	_ provider.Configuration = Configuration{}
+)
+
 // New creates a new SNMP provider from configuration
 func (configuration Configuration) New(r *reporter.Reporter) (provider.Provider, error) {
 	for exporterIP, agentIP := range configuration.Agents {

outlet/metadata/provider/static/root.go

@@ -35,6 +35,11 @@ type Provider struct {
 	}
 }
 
+var (
+	_ provider.Provider      = &Provider{}
+	_ provider.Configuration = Configuration{}
+)
+
 // New creates a new static provider from configuration
 func (configuration Configuration) New(r *reporter.Reporter) (provider.Provider, error) {
 	p := &Provider{

outlet/routing/provider/bioris/root.go

@@ -63,6 +63,11 @@ type Provider struct {
 // Dependencies define the dependencies of the BioRIS Provider.
 type Dependencies = provider.Dependencies
 
+var (
+	_ provider.Provider      = &Provider{}
+	_ provider.Configuration = Configuration{}
+)
+
 // New creates a new BioRIS provider.
 func (configuration Configuration) New(r *reporter.Reporter, dependencies Dependencies) (provider.Provider, error) {
 	p := Provider{

outlet/routing/provider/bmp/root.go

@@ -44,6 +44,11 @@ type Provider struct {
 // Dependencies define the dependencies of the BMP component.
 type Dependencies = provider.Dependencies
 
+var (
+	_ provider.Provider      = &Provider{}
+	_ provider.Configuration = Configuration{}
+)
+
 // New creates a new BMP component from its configuration.
 func (configuration Configuration) New(r *reporter.Reporter, dependencies Dependencies) (provider.Provider, error) {
 	if dependencies.Clock == nil {