[FABG-788] Set PeerChannelConfig defaults properly

When a channels->peers entry is specified with NO PeerChannelConfig in
config.yaml, make sure the defaults are filled in correctly.

Change-Id: I5032d914cc037998c93d797102ba114025d16449
Signed-off-by: Nye Liu <nye@blockdaemon.com>

Author: nyetwurk

pkg/fab/endpointconfig.go

@@ -1749,7 +1749,22 @@ func peerChannelConfigHookFunc() mapstructure.DecodeHookFunc {
 		t reflect.Type,
 		data interface{}) (interface{}, error) {
 
-		//If target is of type 'fab.PeerChannelConfig', then only hook should work
+		//Run through each PeerChannelConfig, create empty config map if value is nil
+		if t == reflect.TypeOf(map[string]PeerChannelConfig{}) {
+			dataMap, ok := data.(map[string]interface{})
+			if ok {
+				for k, v := range dataMap {
+					if v == nil {
+						// Make an empty map. It will be filled in with defaults
+						// in other hook below
+						dataMap[k] = make(map[string]interface{})
+					}
+				}
+				return dataMap, nil
+			}
+		}
+
+		//If target is of type 'fab.PeerChannelConfig', fill in defaults if not already specified
 		if t == reflect.TypeOf(PeerChannelConfig{}) {
 			dataMap, ok := data.(map[string]interface{})
 			if ok {

pkg/fab/endpointconfig_test.go

@@ -1107,21 +1107,27 @@ func TestPeerChannelConfig(t *testing.T) {
 	assert.Equal(t, 6*time.Second, eventPolicies.PeerMonitorPeriod, "Unexpected value for PeerMonitorPeriod")
 
 	//Test if custom hook for (default=true) func is working
-	assert.True(t, len(networkConfig.Channels[orgChannelID].Peers) == 2)
+	assert.True(t, len(networkConfig.Channels[orgChannelID].Peers) == 3)
 	//test orgchannel peer1 (EndorsingPeer should be true as set, remaining should be default = true)
 	orgChannelPeer1 := networkConfig.Channels[orgChannelID].Peers["peer0.org1.example.com"]
 	assert.True(t, orgChannelPeer1.EndorsingPeer)
 	assert.True(t, orgChannelPeer1.LedgerQuery)
 	assert.True(t, orgChannelPeer1.EventSource)
 	assert.True(t, orgChannelPeer1.ChaincodeQuery)
 
-	//test orgchannel peer1 (EndorsingPeer should be false as set, remaining should be default = true)
+	//test orgchannel peer2 (EndorsingPeer should be false as set, remaining should be default = true)
 	orgChannelPeer2 := networkConfig.Channels[orgChannelID].Peers["peer0.org2.example.com"]
 	assert.False(t, orgChannelPeer2.EndorsingPeer)
 	assert.True(t, orgChannelPeer2.LedgerQuery)
 	assert.True(t, orgChannelPeer2.EventSource)
 	assert.True(t, orgChannelPeer2.ChaincodeQuery)
 
+	//test orgchannel peer3 (All should be true)
+	orgChannelPeer3 := networkConfig.Channels[orgChannelID].Peers["peer0.org3.example.com"]
+	assert.True(t, orgChannelPeer3.EndorsingPeer)
+	assert.True(t, orgChannelPeer3.LedgerQuery)
+	assert.True(t, orgChannelPeer3.EventSource)
+	assert.True(t, orgChannelPeer3.ChaincodeQuery)
 }
 
 func TestEndpointConfigWithMultipleBackends(t *testing.T) {
@@ -1281,6 +1287,7 @@ func tamperPeerChannelConfig(backend *mocks.MockConfigBackend) {
 		"peers": map[string]interface{}{
 			"peer0.org1.example.com": map[string]interface{}{"endorsingpeer": true},
 			"peer0.org2.example.com": map[string]interface{}{"endorsingpeer": false},
+			"peer0.org3.example.com": nil,
 		},
 	}
 	(channelsMap.(map[string]interface{}))[orgChannelID] = orgChannel