元旦的時候發現floodlight居然更新了，嚇壞我了。V0.9是12年10月更新的，然後在14年12月30日連續發佈了V0.91和V1.0。OTZ……
根據release note來看，主要最大的更新在於添加了對於of1.3的支持。雖然我尚未驗證（後續會驗證）floodlight對of1.3的支持程度，但是release note中的這句話：“ and work with OpenFlow 1.3 features such as groups and meters.”。我猜測大概是能夠識別組表和計量表，但是不作處理。OTZ……還有就是以往一些小bug的修復，最直觀的就是頁面的改進。拓撲結構、ip、流表等信息不再像以往一樣顯不顯示得看臉，可以實時準確的顯示出來。
下面是具體的添加模塊的實驗。
導入工程：
從git上直接拉下來的代碼是沒法直接導入到eclipse中的，需要添加.project文件和,classpath文件：
Project文件：
<?xml version="1.0" encoding="UTF-8"?> <projectDescription> <name>floodlight</name> <comment></comment> <projects> </projects> <buildSpec> <buildCommand> <name>org.python.pydev.PyDevBuilder</name> <arguments> </arguments> </buildCommand> <buildCommand> <name>org.eclipse.jdt.core.javabuilder</name> <arguments> </arguments> </buildCommand> </buildSpec> <natures> <nature>org.eclipse.jdt.core.javanature</nature> <nature>org.python.pydev.pythonNature</nature> </natures> </projectDescription>
Classpath文件：
<?xml version="1.0" encoding="UTF-8"?> <classpath> <classpathentry kind="src" output="target/bin" path="src/main/java"/> <classpathentry kind="src" path="src/main/resources"/> <classpathentry kind="src" output="target/bin-test" path="src/test/java"/> <classpathentry kind="src" path="src/test/resources"/> <classpathentry kind="src" output="target/bin" path="lib/gen-java"/> <classpathentry exported="true" kind="lib" path="lib/args4j-2.0.16.jar"/> <classpathentry exported="true" kind="lib" path="lib/cglib-nodep-2.2.2.jar"/> <classpathentry exported="true" kind="lib" path="lib/concurrentlinkedhashmap-lru-1.2.jar"/> <classpathentry exported="true" kind="lib" path="lib/derby-10.9.1.0.jar"/> <classpathentry exported="true" kind="lib" path="lib/findbugs-annotations-2.0.1.jar"/> <classpathentry exported="true" kind="lib" path="lib/findbugs-jsr305-2.0.1.jar"/> <classpathentry exported="true" kind="lib" path="lib/guava-13.0.1.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-annotations-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-core-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-databind-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-dataformat-csv-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-dataformat-smile-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-dataformat-xml-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/jackson-dataformat-yaml-2.1.4.jar"/> <classpathentry exported="true" kind="lib" path="lib/junit-4.8.2.jar" sourcepath="C:/Users/dell/.m2/repository/junit/junit/4.8.2/junit-4.8.2-sources.jar"/> <classpathentry exported="true" kind="lib" path="lib/jython-2.5.2.jar"/> <classpathentry exported="true" kind="lib" path="lib/libthrift-0.9.0.jar"/> <classpathentry exported="true" kind="lib" path="lib/logback-classic-1.0.0.jar"/> <classpathentry exported="true" kind="lib" path="lib/logback-core-1.0.0.jar"/> <classpathentry exported="true" kind="lib" path="lib/netty-3.2.6.Final.jar" sourcepath="C:/Users/dell/.m2/repository/org/jboss/netty/netty/3.2.6.Final/netty-3.2.6.Final-sources.jar"/> <classpathentry exported="true" kind="lib" path="lib/objenesis-1.2.jar"/> <classpathentry exported="true" kind="lib" path="lib/org.easymock-3.1.jar"/> <classpathentry exported="true" kind="lib" path="lib/org.restlet-2.2M3.jar"/> <classpathentry exported="true" kind="lib" path="lib/org.restlet.ext.jackson-2.2M3.jar"/> <classpathentry exported="true" kind="lib" path="lib/org.restlet.ext.simple-2.2M3.jar"/> <classpathentry exported="true" kind="lib" path="lib/org.restlet.ext.slf4j-2.2M3.jar"/> <classpathentry exported="true" kind="lib" path="lib/simple-5.1.1.jar"/> <classpathentry exported="true" kind="lib" path="lib/slf4j-api-1.6.4.jar"/> <classpathentry kind="lib" path="lib/asm-3.0.jar"/> <classpathentry kind="lib" path="lib/asm-tree-3.0.jar"/> <classpathentry kind="lib" path="lib/cobertura-1.9.4.1.jar"/> <classpathentry kind="lib" path="lib/hamcrest-core-1.3.jar"/> <classpathentry kind="lib" path="lib/hamcrest-integration-1.3.jar"/> <classpathentry kind="lib" path="lib/hamcrest-library-1.3.jar"/> <classpathentry kind="lib" path="lib/j3dutils.jar"/> <classpathentry kind="lib" path="lib/jdeb-1.0.1.jar"/> <classpathentry kind="lib" path="lib/log4j-1.2.9.jar"/> <classpathentry kind="lib" path="lib/openflowj-0.9.0-SNAPSHOT-javadoc.jar"/> <classpathentry kind="lib" path="lib/openflowj-0.9.0-SNAPSHOT-sources.jar"/> <classpathentry kind="lib" path="lib/openflowj-0.9.0-SNAPSHOT.jar"/> <classpathentry kind="lib" path="lib/packetstreamer-thrift.jar"/> <classpathentry kind="lib" path="lib/oro/jakarta-oro-2.0.8.jar"/> <classpathentry exported="true" kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/> <classpathentry kind="output" path="target/bin"/> </classpath>然後就可以作爲普通的項目導入即可。
實驗過程：
這裏的實驗做的是對packet-in包的數量進行統計並打印到控制檯，功能單一，但能體現出添加新模塊的整個流程。
1.添加新服務接口
首先需要定義新加模塊服務的接口：
package net.floodlightcontroller.statics; import net.floodlightcontroller.core.module.IFloodlightService; /** * The service registry * @author yangshuai */ public interface IPktinHistoryService extends IFloodlightService { /* * 用於統計結果 */ public long getPackINCount(); }
2.添加PktinHistory模塊：因爲這裏添加的新模塊的功能比較單一，只是統計floodlight運行後packet-in包的總數量，並且是持續累計計數的，所以只需在該接口中定義一個用於計算的方法就可以了。定義PktinHistory模塊：
package net.floodlightcontroller.statics; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.Map; import java.util.concurrent.atomic.AtomicLong; import org.projectfloodlight.openflow.protocol.OFMessage; import org.projectfloodlight.openflow.protocol.OFType; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import net.floodlightcontroller.core.FloodlightContext; import net.floodlightcontroller.core.IFloodlightProviderService; import net.floodlightcontroller.core.IOFMessageListener; import net.floodlightcontroller.core.IOFSwitch; import net.floodlightcontroller.core.module.FloodlightModuleContext; import net.floodlightcontroller.core.module.FloodlightModuleException; import net.floodlightcontroller.core.module.IFloodlightModule; import net.floodlightcontroller.core.module.IFloodlightService; import net.floodlightcontroller.restserver.IRestApiService; /* * *@author yangshuai */ public class PktinHistory implements IOFMessageListener,IFloodlightModule,IPktinHistoryService{ protected static Logger log = LoggerFactory.getLogger(PktinHistory.class); protected IFloodlightProviderService FloodlightProvider ; protected IRestApiService restApi ; private AtomicLong PACKET_IN_COUNT = new AtomicLong() ; @Override public String getName() { return "PktinHistory" ; } @Override public boolean isCallbackOrderingPrereq(OFType type, String name) { // TODO Auto-generated method stub return false; } @Override public boolean isCallbackOrderingPostreq(OFType type, String name) { // TODO Auto-generated method stub return false; } @Override public long getPackINCount() { return PACKET_IN_COUNT.get(); } @Override public Collection<Class<? extends IFloodlightService>> getModuleServices() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IPktinHistoryService.class); return l; } @Override public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { Map<Class<? extends IFloodlightService>,IFloodlightService> m = new HashMap<Class<? extends IFloodlightService>,IFloodlightService>(); m.put(IPktinHistoryService.class,this); return m; } @Override public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>() ; l.add(IFloodlightProviderService.class); l.add(IRestApiService.class); return l ; } @Override public void init(FloodlightModuleContext context) throws FloodlightModuleException { FloodlightProvider = context.getServiceImpl(IFloodlightProviderService.class); restApi = context.getServiceImpl(IRestApiService.class) ; } @Override public void startUp(FloodlightModuleContext context) throws FloodlightModuleException { FloodlightProvider.addOFMessageListener(OFType.PACKET_IN,this) ; } @Override public net.floodlightcontroller.core.IListener.Command receive( IOFSwitch sw, OFMessage msg, FloodlightContext cntx) { long count = PACKET_IN_COUNT.incrementAndGet() ; log.info("The total count of packet-in Messages are" + count); return Command.CONTINUE ; } }
在floodlight中所有的模塊都必須實現IFloodlightModule接口，而這裏新添加的模塊需要監聽數據包，所以也需要實現IOFMessageListener接口。IOFMessageListener接口用於監聽Packet-in消息，並記錄消息遞增數量，IPktinHistoryService接口是業務查詢接口，提供Packet-in數據分組統計結果查詢服務，IFloodLightModule接口標識該類是一個floodlight模塊，繼承該接口的類會在floodlight啓動過程中以模塊形式加載。該類文件可以隨意添加到任何包中，爲了方便管理和演示，這裏將所有添加該模塊所新建的文件全都放在了新建包net.floodlightcontroller.statics中。這個路勁在後面修改配置文件中仍然會使用到。
3.rest資源定義
在完成模塊的定義之後，需要對rest服務資源進行定義，這裏將類名定義爲：PktInHistoryResource，繼承抽象類ServerResource（ServerResource是Java輕量級REST框架Restlet的抽象類），並實現業務邏輯。該步主要功能是將Packet-in統計接口包裝爲REST資源便於後續資源綁定。
package net.floodlightcontroller.statics; import java.util.HashMap; import org.restlet.resource.Get; import org.restlet.resource.ServerResource; /* * *@author yangshuai */ public class PktInHistoryResource extends ServerResource{ @Get("json") public HashMap<String, String> retrieve(){ IPktinHistoryService pihr = (IPktinHistoryService) getContext() .getAttributes().get(IPktinHistoryService.class.getCanonicalName()); long count = pihr.getPackINCount(); HashMap<String, String> resp = new HashMap<String, String>() ; resp.put("Total", Long.toString(count)) ; return resp; } }
4.綁定url與rest資源
接着定義PktInHistoryWebRoutable類，將上步定義的PktInHistoryResource資源與訪問路徑綁定。該類中定義的路徑包括外部獲取該REST資源的基本路徑和相對路徑。
package net.floodlightcontroller.statics; import net.floodlightcontroller.restserver.RestletRoutable; import org.restlet.Context; import org.restlet.Restlet; import org.restlet.routing.Router; /* * *@author yangshuai */ public class PktInHistoryWebRoutable implements RestletRoutable{ public Restlet getRestlet(Context context){ Router router =new Router(context) ; router.attach("/pktinhistory/json", PktInHistoryResource.class) ; return router ; } public String basePath(){ return "/vm/statics" ; } }
5.資源發佈資源綁定相應路徑後需要在REST服務中發佈，因此還需要在PktinHistory的startUp方法中註冊PktInHistoryWebRoutable，表明有新的資源加入REST服務。
@Override public void init(FloodlightModuleContext context) throws FloodlightModuleException { FloodlightProvider = context.getServiceImpl(IFloodlightProviderService.class); restApi = context.getServiceImpl(IRestApiService.class) ; }
6.定義完上述源碼後還需要在配置文件中指定新增模塊名，該配置文件爲resources/META-INF/services/net.FloodLight.core.module.IFloodLightModule，這裏就是添加net.FloodLightcontroller.statics.PktinHistory模塊配置信息。該配置文件是FloodLight模塊加載系統中加載模塊類的依據，用於告知控制器要加載那些模塊。
7.除上述配置外，還需要在resources/floodlightdefault.properties中的floodlight.modules配置參數後追加新增模塊名（net.FloodLight.controller.statics.PktinHistory 注：這裏就要根據添加的PktinHistory 類的具體路徑進行修改），表明該配置啓動時必須加載。
實驗成果截圖：
問題：
在floodlight的顯示界面上的監聽端口爲6633，在1.0以前的版本中，mininet連接到floodlight遠程控制器時指定的端口號也是6633。但是在floodlight1.0版本的測試時，是使用6653端口連接上的。
