various: Add missing docstrings to fix linter error

mod-frrouting/init.go

@@ -35,7 +35,8 @@ type frroutingModule struct {
 	TelnetPassword string
 }
 
-func NewFrroutingModule() *frroutingModule {
+// NewFrroutingModule instantiates frroutingModule and all contained plugins
+func NewFrroutingModule() nagocheck.Module {
 	return &frroutingModule{
 		Module: nagocheck.NewModule("frrouting",
 			nagocheck.ModuleDescription("FRRouting"),

mod-system/init.go

@@ -24,6 +24,7 @@ type systemModule struct {
 	nagocheck.Module
 }
 
+// NewSystemModule instantiates systemModule and all contained plugins
 func NewSystemModule() nagocheck.Module {
 	return &systemModule{
 		Module: nagocheck.NewModule("system",

nagocheck/kingpin.go

@@ -5,6 +5,7 @@ import (
 	"gopkg.in/alecthomas/kingpin.v2"
 )
 
+// KingpinNode is a unified interface for kingpin, which allows using Arg() and Flag() at root- and command-level
 type KingpinNode interface {
 	Arg(name, help string) *kingpin.ArgClause
 	Flag(name, help string) *kingpin.FlagClause

nagocheck/module.go

@@ -24,7 +24,7 @@ import (
 	"gopkg.in/alecthomas/kingpin.v2"
 )
 
-// Module collects several plugin commands underneath a module command and offers the possibility to define CLI flags
+// Module consists out of several plugins and offers methods for executing them
 type Module interface {
 	Name() string
 	Description() string
@@ -37,6 +37,7 @@ type Module interface {
 	GetPluginByName(pluginName string) (Plugin, error)
 }
 
+// ModuleOpt is a type alias for functional options used by NewModule()
 type ModuleOpt func(*baseModule)
 
 type baseModule struct {
@@ -45,6 +46,8 @@ type baseModule struct {
 	plugins     map[string]Plugin
 }
 
+// RegisterModules returns a map of modules with their name as the respective key. Additionally, all plugins contained
+// by these modules are being registered to their respective module using Plugin.setModule()
 func RegisterModules(modules ...Module) map[string]Module {
 	result := make(map[string]Module)
 	for _, module := range modules {
@@ -57,7 +60,7 @@ func RegisterModules(modules ...Module) map[string]Module {
 	return result
 }
 
-// NewModule instantiates a new baseModule, which should be inherited by user-defined module types
+// NewModule instantiates baseModule with the given functional options
 func NewModule(name string, options ...ModuleOpt) Module {
 	module := &baseModule{
 		name:        name,
@@ -72,12 +75,14 @@ func NewModule(name string, options ...ModuleOpt) Module {
 	return module
 }
 
+// ModuleDescription is a functional option for NewModule(), which sets the module description
 func ModuleDescription(description string) ModuleOpt {
 	return func(m *baseModule) {
 		m.description = description
 	}
 }
 
+// ModulePlugin is a functional option for NewModule(), which registers a plugin using Module.RegisterPlugin()
 func ModulePlugin(plugin Plugin) ModuleOpt {
 	return func(m *baseModule) {
 		m.RegisterPlugin(plugin)

nagocheck/plugin.go

@@ -4,6 +4,7 @@ import (
 	"github.com/snapserv/nagopher"
 )
 
+// Plugin represents a single check including its CLI arguments
 type Plugin interface {
 	Name() string
 	Description() string
@@ -19,6 +20,7 @@ type Plugin interface {
 	defineDefaultFlags(node KingpinNode)
 }
 
+// PluginOpt is a type alias for functional options used by NewPlugin()
 type PluginOpt func(*basePlugin)
 
 type basePlugin struct {
@@ -33,6 +35,7 @@ type basePlugin struct {
 	criticalThreshold nagopher.OptionalBounds
 }
 
+// NewPlugin instantiates basePlugin with the given functional options
 func NewPlugin(name string, options ...PluginOpt) Plugin {
 	plugin := &basePlugin{
 		name:                 name,
@@ -48,18 +51,21 @@ func NewPlugin(name string, options ...PluginOpt) Plugin {
 	return plugin
 }
 
+// PluginDescription is a functional option for NewPlugin(), which sets the module description
 func PluginDescription(description string) PluginOpt {
 	return func(p *basePlugin) {
 		p.description = description
 	}
 }
 
+// PluginDefaultFlags is a functional option for NewPlugin(), which toggles the definition of default flags
 func PluginDefaultFlags(enabled bool) PluginOpt {
 	return func(p *basePlugin) {
 		p.useDefaultFlags = enabled
 	}
 }
 
+// PluginDefaultThresholds is a functional option for NewPlugin(), which toggles the definition of default thresholds
 func PluginDefaultThresholds(enabled bool) PluginOpt {
 	return func(p *basePlugin) {
 		p.useDefaultThresholds = enabled

nagocheck/resource.go

@@ -10,11 +10,13 @@ import (
 	"syscall"
 )
 
+// Resource provides a base type for nagocheck resources, which embeds nagopher.Resource
 type Resource interface {
 	nagopher.Resource
 	Plugin() Plugin
 }
 
+// ResourceOpt is a type alias for functional options used by NewSummarizer()
 type ResourceOpt func(*baseResource)
 
 type baseResource struct {
@@ -27,6 +29,7 @@ type baseResource struct {
 const shmOpenFlags = os.O_CREATE | os.O_RDONLY | syscall.O_DSYNC | syscall.O_RSYNC
 const shmDefaultMode = 0600
 
+// NewResource instantiates baseResource with the given functional options
 func NewResource(plugin Plugin, options ...ResourceOpt) Resource {
 	resource := &baseResource{
 		Resource: nagopher.NewResource(),
@@ -40,6 +43,7 @@ func NewResource(plugin Plugin, options ...ResourceOpt) Resource {
 	return resource
 }
 
+// ResourcePersistence is a functional option for NewResource(), which enables resource persistence with the given key
 func ResourcePersistence(uniqueKey string) ResourceOpt {
 	return func(r *baseResource) {
 		r.persistenceKey = r.Plugin().Name() + uniqueKey

nagocheck/summarizer.go

@@ -2,18 +2,21 @@ package nagocheck
 
 import "github.com/snapserv/nagopher"
 
+// Summarizer provides a base type for nagocheck summarizers, which embeds nagopher.Summarizer
 type Summarizer interface {
 	nagopher.Summarizer
 	Plugin() Plugin
 }
 
+// SummarizerOpt is a type alias for functional options used by NewSummarizer()
 type SummarizerOpt func(*baseSummarizer)
 
 type baseSummarizer struct {
 	nagopher.Summarizer
 	plugin Plugin
 }
 
+// NewSummarizer instantiates baseSummarizer with the given functional options
 func NewSummarizer(plugin Plugin, options ...SummarizerOpt) Summarizer {
 	summarizer := &baseSummarizer{
 		Summarizer: nagopher.NewSummarizer(),