[FAB-6736] ServiceDiscovery: Endorsement descriptors

This change set implements an endorsement descriptor builder
for simple policies (where each peer satisfies only 1 principal,
such as endorsement policies that are comprised only of Member roles).

Tests have been added for a code coverage of 100%.

Change-Id: I86bf653337a47eba6708f4d6dee631bfb36fa954
Signed-off-by: yacovm <yacovm@il.ibm.com>

Author: yacovm

common/chaincode/metadata.go

@@ -0,0 +1,39 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import "github.com/hyperledger/fabric/protos/gossip"
+
+// InstalledChaincode defines metadata about an installed chaincode
+type InstalledChaincode struct {
+	Name    string
+	Version string
+	Id      []byte
+}
+
+// InstantiatedChaincode defines channel-scoped metadata of a chaincode
+type InstantiatedChaincode struct {
+	Name    string
+	Version string
+	Policy  []byte
+	Id      []byte
+}
+
+// InstantiatedChaincodes defines an aggregation of InstantiatedChaincodes
+type InstantiatedChaincodes []InstantiatedChaincode
+
+// ToChaincodes converts this InstantiatedChaincodes to a slice of gossip.Chaincodes
+func (ccs InstantiatedChaincodes) ToChaincodes() []*gossip.Chaincode {
+	var res []*gossip.Chaincode
+	for _, cc := range ccs {
+		res = append(res, &gossip.Chaincode{
+			Name:    cc.Name,
+			Version: cc.Version,
+		})
+	}
+	return res
+}

common/chaincode/metadata_test.go

@@ -0,0 +1,26 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package chaincode
+
+import (
+	"testing"
+
+	"github.com/hyperledger/fabric/protos/gossip"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToChaincodes(t *testing.T) {
+	ccs := InstantiatedChaincodes{
+		{
+			Name:    "foo",
+			Version: "1.0",
+		},
+	}
+	assert.Equal(t, []*gossip.Chaincode{
+		{Name: "foo", Version: "1.0"},
+	}, ccs.ToChaincodes())
+}