FAB-16544 Properly detect node-readdition

As pointed our in the review of the CR above, there was a logic bug in
handling removed organizations.  This CR adds a tests case and a fix.

Signed-off-by: Jason Yellick <jyellick@us.ibm.com>
Change-Id: I6b4d7d0bb3d602867144860508b6683d7b23eb5e

internal/pkg/peer/orderers/connection.go

@@ -60,6 +60,8 @@ func (cs *ConnectionSource) Update(globalAddrs []string, orgs map[string]Orderer
 	defer cs.mutex.Unlock()
 	cs.logger.Debug("Processing updates for orderer endpoints")
 
+	newOrgToEndpointsHash := map[string][]byte{}
+
 	anyChange := false
 	hasOrgEndpoints := false
 	for orgName, org := range orgs {
@@ -73,8 +75,9 @@ func (cs *ConnectionSource) Update(globalAddrs []string, orgs map[string]Orderer
 		}
 		hash := hasher.Sum(nil)
 
+		newOrgToEndpointsHash[orgName] = hash
+
 		lastHash, ok := cs.orgToEndpointsHash[orgName]
-		cs.orgToEndpointsHash[orgName] = hash
 		if ok && bytes.Equal(hash, lastHash) {
 			continue
 		}
@@ -91,6 +94,8 @@ func (cs *ConnectionSource) Update(globalAddrs []string, orgs map[string]Orderer
 		}
 	}
 
+	cs.orgToEndpointsHash = newOrgToEndpointsHash
+
 	if hasOrgEndpoints && len(globalAddrs) > 0 {
 		cs.logger.Warning("Config defines both orderer org specific endpoints and global endpoints, global endpoints will be ignored")
 	}

internal/pkg/peer/orderers/connection_test.go

@@ -297,6 +297,39 @@ var _ = Describe("Connection", func() {
 				Expect(endpoint.Refreshed).To(BeClosed())
 			}
 		})
+
+		When("the org is added back", func() {
+			BeforeEach(func() {
+				cs.Update(nil, map[string]orderers.OrdererOrg{
+					"org1": org1,
+					"org2": org2,
+				})
+			})
+
+			It("returns to the set of orderer endpoints", func() {
+				newEndpoints := cs.Endpoints()
+				Expect(stripEndpoints(newEndpoints)).To(ConsistOf(
+					stripEndpoints([]*orderers.Endpoint{
+						{
+							Address:  "org1-address1",
+							CertPool: org1CertPool,
+						},
+						{
+							Address:  "org1-address2",
+							CertPool: org1CertPool,
+						},
+						{
+							Address:  "org2-address1",
+							CertPool: org2CertPool,
+						},
+						{
+							Address:  "org2-address2",
+							CertPool: org2CertPool,
+						},
+					}),
+				))
+			})
+		})
 	})
 
 	When("an update modifies the global endpoints but does does not affect the org endpoints", func() {