Adding approval process

pkg/registrar/approval.go

@@ -0,0 +1,87 @@
+package registrar
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/google/uuid"
+	svc "go.fixergrid.net/servicedemon/pkg/registrar/internal/services"
+)
+
+const APPROVAL_TOPIC = "net.fixergrid.events.app.approved"
+
+type ApprovalListener struct {
+	svc.ApprovalRequester
+	svc.PubSub
+	svc.AppRepo
+	log internalLog
+}
+
+type option func(r *ApprovalListener)
+
+func OptionLog(l logger) option {
+	return func(r *ApprovalListener) {
+		r.log = internalLog{l}
+	}
+}
+
+func NewApprovalListener(ps svc.PubSub, requester svc.ApprovalRequester, options ...option) ApprovalListener {
+	out := ApprovalListener{
+		PubSub:            ps,
+		ApprovalRequester: requester,
+	}
+
+	for _, opt := range options {
+		opt(&out)
+	}
+	return out
+}
+
+func (a ApprovalListener) Run(ctx context.Context) {
+	newAppEvents := a.Subscribe(REGISTRATION_TOPIC)
+	approvalEvents := a.Subscribe(APPROVAL_TOPIC)
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case event := <-newAppEvents:
+			msg, err := readMessage(event)
+			if err != nil {
+				a.log.Printf("failed to read message: got '%s': %v", event, err)
+			}
+			a.SendApprovalRequest(msg["name"])
+		case event := <-approvalEvents:
+			msg, err := readMessage(event)
+			if err != nil {
+				a.log.Printf("approvalevent: failed to read message: got '%s': %v", event, err)
+			}
+			id := uuid.MustParse(msg["id"])
+			a.HandleApprovedRequest(id)
+		}
+	}
+}
+
+func (a ApprovalListener) SendApprovalRequest(name string) {
+	a.log.Printf("sent approval message for [%s]", name)
+}
+
+func (a ApprovalListener) HandleApprovedRequest(id uuid.UUID) {
+	res, err := a.ApproveApp(id)
+	if err != nil {
+		a.log.Printf("ERROR: couldn't approve request: %v", err)
+		return
+	}
+
+	a.log.Printf("approved application [%s]", res.ID)
+}
+
+func readMessage(event string) (map[string]string, error) {
+	out := map[string]string{}
+
+	err := json.Unmarshal([]byte(event), &out)
+	if err != nil {
+		return nil, fmt.Errorf("readMessage: %w", err)
+	}
+	return out, nil
+}