more file structure

api/resource/common/handler.go

@@ -0,0 +1,43 @@
+package common
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+)
+
+// Display some information about this API for the default page
+// TODO - static fileserver with docs
+func HomeLink(w http.ResponseWriter, r *http.Request) {
+	//w.WriteHeader(http.StatusNotImplemented)
+	fmt.Fprintf(w, "VM Chargeback Tracking Program. API interface only. See Nathan Coad (nathan.coad@dell.com) for further details. ")
+}
+
+// Display error message for invalid requests
+func HandleNotFound(w http.ResponseWriter, r *http.Request) {
+	ip, err := IPFromRequest(r)
+	if err != nil {
+		fmt.Println("Error", err)
+		http.Error(w, "VM Chargeback Tracking Program.. Invalid Path Specified.", http.StatusNotFound)
+		return
+	}
+
+	fmt.Printf("Request from IP %s\n", ip.String())
+	http.Error(w, "VM Chargeback Tracking Program. Invalid Path Specified.", http.StatusNotFound)
+	// TODO - investigate rate limiting for invalid requests
+}
+
+// IPFromRequest extracts the user IP address from req, if present.
+// @see https://blog.golang.org/context/userip/userip.go
+func IPFromRequest(req *http.Request) (net.IP, error) {
+	ip, _, err := net.SplitHostPort(req.RemoteAddr)
+	if err != nil {
+		return nil, fmt.Errorf("userip: %q is not IP:port", req.RemoteAddr)
+	}
+
+	userIP := net.ParseIP(ip)
+	if userIP == nil {
+		return nil, fmt.Errorf("userip: %q is not IP:port", req.RemoteAddr)
+	}
+	return userIP, nil
+}

api/resource/vm/handler.go

@@ -0,0 +1,32 @@
+package vm
+
+import (
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+
+	"github.com/gorilla/mux"
+)
+
+// TODO godoc
+func VmCreateHandler(w http.ResponseWriter, r *http.Request) {
+
+	reqBody, err := io.ReadAll(r.Body)
+	if err != nil {
+		fmt.Fprintf(w, "Invalid data received")
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	slog.Debug("received create request", "body", string(reqBody))
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Create Request (%d): %v\n", len(reqBody), string(reqBody))
+}
+
+// TODO godoc
+func VmRemoveHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprintf(w, "Remove Request: %v\n", vars)
+}

api/resource/vm/model.go

@@ -0,0 +1,58 @@
+package vm
+
+import "time"
+
+type CloudEventReceived struct {
+	ID          string    `json:"id"`
+	Specversion string    `json:"specversion"`
+	Source      string    `json:"source"`
+	Type        string    `json:"type"`
+	Time        time.Time `json:"time"`
+	Data        struct {
+		ChainID         int    `json:"ChainId"`
+		ChangeTag       string `json:"ChangeTag"`
+		ComputeResource struct {
+			ComputeResource struct {
+				Type  string `json:"Type"`
+				Value string `json:"Value"`
+			} `json:"ComputeResource"`
+			Name string `json:"Name"`
+		} `json:"ComputeResource"`
+		CreatedTime time.Time `json:"CreatedTime"`
+		Datacenter  struct {
+			Datacenter struct {
+				Type  string `json:"Type"`
+				Value string `json:"Value"`
+			} `json:"Datacenter"`
+			Name string `json:"Name"`
+		} `json:"Datacenter"`
+		Ds                   interface{} `json:"Ds"`
+		Dvs                  interface{} `json:"Dvs"`
+		FullFormattedMessage string      `json:"FullFormattedMessage"`
+		Host                 struct {
+			Host struct {
+				Type  string `json:"Type"`
+				Value string `json:"Value"`
+			} `json:"Host"`
+			Name string `json:"Name"`
+		} `json:"Host"`
+		Key         int         `json:"Key"`
+		Net         interface{} `json:"Net"`
+		SrcTemplate struct {
+			Name string `json:"Name"`
+			VM   struct {
+				Type  string `json:"Type"`
+				Value string `json:"Value"`
+			} `json:"Vm"`
+		} `json:"SrcTemplate"`
+		Template bool   `json:"Template"`
+		UserName string `json:"UserName"`
+		VM       struct {
+			Name string `json:"Name"`
+			VM   struct {
+				Type  string `json:"Type"`
+				Value string `json:"Value"`
+			} `json:"Vm"`
+		} `json:"Vm"`
+	} `json:"data"`
+}

api/router/router.go

@@ -0,0 +1,25 @@
+package router
+
+import (
+	"net/http"
+	"vm-ctp/api/resource/common"
+	"vm-ctp/api/resource/vm"
+
+	"github.com/gorilla/mux"
+)
+
+func New() *mux.Router {
+	r := mux.NewRouter()
+
+	// If nothing more specific is requested then just display some version information
+	r.HandleFunc("/", common.HomeLink)
+
+	s := r.PathPrefix("/api").Subrouter()
+	s.HandleFunc("/event/vm/create", vm.VmCreateHandler).Methods("POST") // receive VM creation event from Direktiv
+	s.HandleFunc("/event/vm/remove", vm.VmRemoveHandler).Methods("POST") // receive VM creation event from Direktiv
+
+	// Not found handler
+	r.NotFoundHandler = http.HandlerFunc(common.HandleNotFound)
+
+	return r
+}