From c77d346016f38806575d7d08cddca46e7a0de7af Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Mon, 25 Jan 2021 11:02:20 +0300
Subject: [PATCH] [#339] services/netmap: Use dynamic node information

Replace static NodeInfo structure with NodeState interface that provides
method to read node information in runtime.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/services/netmap/executor.go | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/pkg/services/netmap/executor.go b/pkg/services/netmap/executor.go
index 1a48c6408..e80dfce7e 100644
--- a/pkg/services/netmap/executor.go
+++ b/pkg/services/netmap/executor.go
@@ -8,28 +8,41 @@ import (
 )
 
 type executorSvc struct {
-	version       *pkg.Version
-	localNodeInfo *netmap.NodeInfo
+	version *pkg.Version
+	state   NodeState
 }
 
-func NewExecutionService(ni *netmap.NodeInfo, v *pkg.Version) netmap.Service {
-	if ni == nil || v == nil {
+// NodeState encapsulates information
+// about current node state.
+type NodeState interface {
+	// Must return current node state
+	// in NeoFS API v2 NodeInfo structure.
+	LocalNodeInfo() (*netmap.NodeInfo, error)
+}
+
+func NewExecutionService(s NodeState, v *pkg.Version) netmap.Service {
+	if s == nil || v == nil {
 		// this should never happen, otherwise it programmers bug
 		panic("can't create netmap execution service")
 	}
 
 	return &executorSvc{
-		version:       v,
-		localNodeInfo: ni,
+		version: v,
+		state:   s,
 	}
 }
 
 func (s *executorSvc) LocalNodeInfo(
 	_ context.Context,
 	_ *netmap.LocalNodeInfoRequest) (*netmap.LocalNodeInfoResponse, error) {
+	ni, err := s.state.LocalNodeInfo()
+	if err != nil {
+		return nil, err
+	}
+
 	body := new(netmap.LocalNodeInfoResponseBody)
 	body.SetVersion(s.version.ToV2())
-	body.SetNodeInfo(s.localNodeInfo)
+	body.SetNodeInfo(ni)
 
 	resp := new(netmap.LocalNodeInfoResponse)
 	resp.SetBody(body)