[FAB-10186] suppress repetitive config WARNs

- move it to initialization of endpoint config


Change-Id: I7078e2949b2590cc198501d16deb4220ee1d47e3
Signed-off-by: Sudesh Shetty <sudesh.shetty@securekey.com>

pkg/fab/channel/transactor.go

@@ -63,8 +63,7 @@ func orderersFromChannelCfg(ctx context.Client, cfg fab.ChannelCfg) ([]fab.Order
 		return nil, err
 	}
 	if len(orderers) > 0 {
-		logger.Warn("Getting orderers from endpoint config channels.orderer is deprecated, use entity matchers to override orderer configuration")
-		logger.Warn("visit https://github.com/hyperledger/fabric-sdk-go/blob/master/test/fixtures/config/overrides/local_entity_matchers.yaml for samples")
+
 		return orderers, nil
 	}
 

pkg/fab/endpointconfig.go

@@ -89,6 +89,9 @@ func ConfigFromBackend(coreBackend ...core.ConfigBackend) (fab.EndpointConfig, e
 		return nil, errors.WithMessage(err, "cert pool load failed")
 	}
 
+	//print deprecated warning
+	detectDeprecatedNetworkConfig(config)
+
 	return config, nil
 }
 
@@ -1141,3 +1144,21 @@ func setDefault(dataMap map[string]interface{}, key string, defaultVal bool) {
 		dataMap[key] = true
 	}
 }
+
+//detectDeprecatedConfigOptions detects deprecated config options and prints warnings
+// currently detects: if channels.orderers are defined
+func detectDeprecatedNetworkConfig(endpointConfig *EndpointConfig) {
+
+	if endpointConfig.networkConfig == nil {
+		return
+	}
+
+	//detect if channels orderers are mentioned
+	for _, v := range endpointConfig.networkConfig.Channels {
+		if len(v.Orderers) > 0 {
+			logger.Warn("Getting orderers from endpoint config channels.orderer is deprecated, use entity matchers to override orderer configuration")
+			logger.Warn("visit https://github.com/hyperledger/fabric-sdk-go/blob/master/test/fixtures/config/overrides/local_entity_matchers.yaml for samples")
+			break
+		}
+	}
+}