table: add attribute hash value to Path structure

This is for batching paths into one bgp message.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 14 insertions, 0 deletions

diff --git a/table/table_manager.go b/table/table_manager.go
index 0331cc70..b94b546e 100644
--- a/table/table_manager.go
+++ b/table/table_manager.go
@@ -21,6 +21,7 @@ import (
 	"net"
 	"time"
 
+	farm "github.com/dgryski/go-farm"
 	"github.com/osrg/gobgp/packet/bgp"
 	log "github.com/sirupsen/logrus"
 )
@@ -68,9 +69,21 @@ func ProcessMessage(m *bgp.BGPMessage, peerInfo *PeerInfo, timestamp time.Time)
 	if reach != nil {
 		listLen += len(reach.Value)
 	}
+
+	var hash uint32
+	if len(adds) > 0 || reach != nil {
+		total := bytes.NewBuffer(make([]byte, 0))
+		for _, a := range attrs {
+			b, _ := a.Serialize()
+			total.Write(b)
+		}
+		hash = farm.Hash32(total.Bytes())
+	}
+
 	pathList := make([]*Path, 0, listLen)
 	for _, nlri := range adds {
 		p := NewPath(peerInfo, nlri, false, attrs, timestamp, false)
+		p.SetHash(hash)
 		pathList = append(pathList, p)
 	}
 	if reach != nil {
@@ -81,6 +94,7 @@ func ProcessMessage(m *bgp.BGPMessage, peerInfo *PeerInfo, timestamp time.Time)
 
 		for _, nlri := range reach.Value {
 			p := NewPath(peerInfo, nlri, false, reachAttrs, timestamp, false)
+			p.SetHash(hash)
 			pathList = append(pathList, p)
 		}
 	}