From c6fee6d01a427bdab9781d352e53250ee63ced69 Mon Sep 17 00:00:00 2001
From: Pavel Karpy <carpawell@nspcc.ru>
Date: Tue, 5 Jul 2022 13:20:10 +0300
Subject: [PATCH] [#240] pool: Add `SyncContainerWithNetwork`

It is a helper function that uses a `Pool` to fetch network information and
apply it to the container (change the container if it does not fit the
network). Currently, only applies the homomorphic hashing parameter.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
---
 pool/pool.go | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/pool/pool.go b/pool/pool.go
index b51d21a..42caaf5 100644
--- a/pool/pool.go
+++ b/pool/pool.go
@@ -1811,3 +1811,26 @@ func (p *Pool) Close() {
 	p.cancel()
 	<-p.closedCh
 }
+
+// SyncContainerWithNetwork applies network configuration received via
+// the Pool to the container. Changes the container if it does not satisfy
+// network configuration.
+//
+// Pool and container MUST not be nil.
+//
+// Returns any error that does not allow reading configuration
+// from the network.
+func SyncContainerWithNetwork(ctx context.Context, cnr *container.Container, p *Pool) error {
+	ni, err := p.NetworkInfo(ctx)
+	if err != nil {
+		return fmt.Errorf("network info: %w", err)
+	}
+
+	if ni == nil {
+		return errors.New("empty network info")
+	}
+
+	container.ApplyNetworkConfig(cnr, *ni)
+
+	return nil
+}