fmaximus commented on a change in pull request #2595: CLOUDSTACK-10199: Support 
requesting a specific IPv4 address
URL: https://github.com/apache/cloudstack/pull/2595#discussion_r193334887
 
 

 ##########
 File path: 
engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java
 ##########
 @@ -869,6 +871,76 @@ public void saveExtraDhcpOptions(final String 
networkUuid, final Long nicId, fin
         return new Pair<NicProfile, Integer>(vmNic, Integer.valueOf(deviceId));
     }
 
+    /**
+     * If the requested IPv4 address from the NicProfile was configured then 
it configures the IPv4 address, Netmask and Gateway to deploy the VM with the 
requested IP.
+     */
+    protected void configureNicProfileBasedOnRequestedIp(NicProfile 
requestedNicProfile, NicProfile nicProfile, Network network) {
+        if (requestedNicProfile == null) {
+            return;
+        }
+        String requestedIpv4Address = requestedNicProfile.getRequestedIPv4();
+        if (requestedIpv4Address == null) {
+            return;
+        }
+        if (!NetUtils.isValidIp4(requestedIpv4Address)) {
+            throw new InvalidParameterValueException(String.format("The 
requested [IPv4 address='%s'] is not a valid IP address", 
requestedIpv4Address));
+        }
+
+        VlanVO vlanVo = _vlanDao.findByNetworkIdAndIpv4(network.getId(), 
requestedIpv4Address);
+        if (vlanVo == null) {
+            throw new InvalidParameterValueException(String.format("Trying to 
configure a Nic with the requested [IPv4='%s'] but cannot find a Vlan for the 
[network id='%s']",
+                    requestedIpv4Address, network.getId()));
+        }
+
+        String ipv4Gateway = vlanVo.getVlanGateway();
+        String ipv4Netmask = vlanVo.getVlanNetmask();
+
+        if (!NetUtils.isValidIp4(ipv4Gateway)) {
+            throw new InvalidParameterValueException(String.format("The 
[IPv4Gateway='%s'] from [VlanId='%s'] is not valid", ipv4Gateway, 
vlanVo.getId()));
+        }
+        if (!NetUtils.isValidIp4Netmask(ipv4Netmask)) {
+            throw new InvalidParameterValueException(String.format("The 
[IPv4Netmask='%s'] from [VlanId='%s'] is not valid", ipv4Netmask, 
vlanVo.getId()));
+        }
+
+        acquireLockAndCheckIfIpv4IsFree(network, requestedIpv4Address);
+
+        nicProfile.setIPv4Address(requestedIpv4Address);
+        nicProfile.setIPv4Gateway(ipv4Gateway);
+        nicProfile.setIPv4Netmask(ipv4Netmask);
+
+        if (nicProfile.getMacAddress() == null) {
+            try {
+                String macAddress = 
_networkModel.getNextAvailableMacAddressInNetwork(network.getId());
+                nicProfile.setMacAddress(macAddress);
+            } catch (InsufficientAddressCapacityException e) {
+                throw new CloudRuntimeException(String.format("Cannot get next 
available mac address in [network id='%s']", network.getId()), e);
+            }
+        }
+    }
+
+    /**
+     *  Acquires lock of in table "user_ip_address" and checks if the 
requested IPv4 address is Free.
+     */
+    protected void acquireLockAndCheckIfIpv4IsFree(Network network, String 
requestedIpv4Address) {
 
 Review comment:
   Will this check work for requested IP addresses in case of Advanced 
networking?
   I believe if the network is of type Guest, then you won't be able to find an 
IPAddressVO.
   So the method should only be called if the network is public or shared.

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