Add missing comments

internal/server/data/resource.go

@@ -28,6 +28,7 @@ import (
 	"github.com/gorilla/mux"
 )
 
+// Constants for error reasons
 const (
 	ResourceItemNotFound = "Resource Item Not Found"
 	NonIntegerValue      = "Non Integer Value"

internal/server/data/state.go

@@ -27,8 +27,10 @@ type safeHandlerMap struct {
 	m  *sync.RWMutex
 }
 
+// Singleton containing all current handlers as a safeHandlerMap
 var Handlers = New()
 
+// New creates a read-to-use safeHandlerMap
 func New() safeHandlerMap {
 	return safeHandlerMap{
 		hs: make(map[string]*model.Handler),

internal/server/srverrors/error.go

@@ -5,10 +5,13 @@ import (
 	"net/http"
 )
 
+// A ServerErrMessage represents the reason why the error happened
 type ServerErrMessage struct {
 	Reason string `json:"reason"`
 }
 
+// WriteErrorResponse writes the error JSON body to the provided http.ResponseWriter,
+// after setting the appropiate Content-Type header
 func WriteErrorResponse(statusCode int, reasonMsg string, res http.ResponseWriter) {
 	respBody := ServerErrMessage{}
 	respBody.Reason = reasonMsg

internal/server/user/server.go

@@ -23,10 +23,12 @@ import (
 	"github.com/BBVA/kapow/internal/server/user/mux"
 )
 
+// Server is a singleton that stores the http.Server for the user package
 var Server = http.Server{
 	Handler: mux.New(),
 }
 
+// Run finishes configuring Server and runs ListenAndServe on it
 func Run(bindAddr string) {
 	Server = http.Server{
 		Addr:    bindAddr,