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[Engine-devel] Local build failing.
by snmishra＠linux.vnet.ibm.com 27 Sep '12

27 Sep '12

Hi, My local build is failing today. I cloned the ovirt-engine repo and ran 'mvn clean install". Failed with following error - Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project vdsbroker: Compilation failure [ERROR] /tmp/ovirt-engine/backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/VdsManager.java:[604,44] illegal start of expression I noticed that Jenkins build succeeded after this change was merged. -Sharad

4 3

[Engine-devel] Serial Execution of Async Tasks
by Allon Mureinik 27 Sep '12

27 Sep '12

Hi guys, As you may know the engine currently has the ability to fire an SPM task, and be asynchronously be "woken-up" when it ends. This is great, but we found the for the Live Storage Migration feature we need something a bit complex - the ability to have a series of async tasks in a single control flow. Here's my initial design for this, your comments and criticism would be welcome: http://wiki.ovirt.org/wiki/Features/Serial_Execution_of_Asynchronous_Tasks_… -Allon

8 25

[Engine-devel] engine build AD/LDAP error
by Dead Horse 25 Sep '12

25 Sep '12

I have built ovirt-engine from the latest GIT master over the past few nights and am running into a MS AD/LDAP error. This same MS AD setup works fine with Released 3.1. Current nightly builds from jenkins are not building all the GWT permutations (Internet Explorer for example) so I have been attempting to re-build the engine so I can test using Internet Explorer. It would be nice if the nightly jenkins builds could be changed to do the build with all GWT permutations enabled. I am building in an FC17 environment with updates applied and current as of today. Accordingly maven3 and all build dependencies are installed from the FC17 repositories. I tried the latest nightly from Jenkins and it does not exhibit the below error. I am guessing I must not have the build recipe/env correct. The AD error I am running into looks like: 2012-09-24 16:15:44,037 ERROR [org.ovirt.engine.core.bll.adbroker.DirectorySearcher] (ajp--127.0.0.1-8702-4) Failed ldap search server LDAP:// someserver.foo.com:389 due to Kerberos error. Please check log for further details.. We should not try the next server 2012-09-24 16:15:44,039 ERROR [org.ovirt.engine.core.bll.adbroker.GSSAPIDirContextAuthenticationStrategy] (ajp--127.0.0.1-8702-2) Error from Kerberos: java.lang.NullPointerException at org.ovirt.engine.core.bll.adbroker.GSSAPICallbackHandler.handle(GSSAPICallbackHandler.java:47) at javax.security.auth.login.LoginContext$SecureCallbackHandler$1.run(LoginContext.java:969) at javax.security.auth.login.LoginContext$SecureCallbackHandler$1.run(LoginContext.java:966) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.login.LoginContext$SecureCallbackHandler.handle(LoginContext.java:965) at com.sun.security.auth.module.Krb5LoginModule.promptForPass(Krb5LoginModule.java:870) at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:715) at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:580) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at javax.security.auth.login.LoginContext.invoke(LoginContext.java:784) at javax.security.auth.login.LoginContext.access$000(LoginContext.java:203) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:698) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:696) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:695) at javax.security.auth.login.LoginContext.login(LoginContext.java:594) at org.ovirt.engine.core.bll.adbroker.GSSAPIDirContextAuthenticationStrategy.authenticateToKDC(GSSAPIDirContextAuthenticationStrategy.java:127) at org.ovirt.engine.core.bll.adbroker.GSSAPIDirContextAuthenticationStrategy.explicitAuth(GSSAPIDirContextAuthenticationStrategy.java:119) at org.ovirt.engine.core.bll.adbroker.GSSAPIDirContextAuthenticationStrategy.authenticate(GSSAPIDirContextAuthenticationStrategy.java:111) at org.ovirt.engine.core.bll.adbroker.GSSAPILdapTemplateWrapper.useAuthenticationStrategy(GSSAPILdapTemplateWrapper.java:86) at org.ovirt.engine.core.bll.adbroker.PrepareLdapConnectionTask.call(PrepareLdapConnectionTask.java:56) at org.ovirt.engine.core.bll.adbroker.DirectorySearcher.find(DirectorySearcher.java:103) at org.ovirt.engine.core.bll.adbroker.DirectorySearcher.FindAll(DirectorySearcher.java:48) at org.ovirt.engine.core.bll.adbroker.LdapSearchGroupsByQueryCommand.executeQuery(LdapSearchGroupsByQueryCommand.java:22) at org.ovirt.engine.core.bll.adbroker.LdapBrokerCommandBase.execute(LdapBrokerCommandBase.java:69) at org.ovirt.engine.core.bll.adbroker.LdapBrokerBase.RunAdAction(LdapBrokerBase.java:18) at org.ovirt.engine.core.bll.SearchQuery.adSearch(SearchQuery.java:194) at org.ovirt.engine.core.bll.SearchQuery.searchAdGroups(SearchQuery.java:172) at org.ovirt.engine.core.bll.SearchQuery.executeQueryCommand(SearchQuery.java:79) at org.ovirt.engine.core.bll.QueriesCommandBase.ExecuteCommand(QueriesCommandBase.java:71) at org.ovirt.engine.core.dal.VdcCommandBase.Execute(VdcCommandBase.java:41) at org.ovirt.engine.core.bll.Backend.runQueryImpl(Backend.java:384) at org.ovirt.engine.core.bll.Backend.RunQuery(Backend.java:367) at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) at org.ovirt.engine.core.utils.ThreadLocalSessionCleanerInterceptor.injectWebContextToThreadLocal(ThreadLocalSessionCleanerInterceptor.java:11) at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptorFactory$ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptorFactory.java:123) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:211) at org.jboss.as.ejb3.tx.CMTTxInterceptor.supports(CMTTxInterceptor.java:363) at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:194) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165) at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:173) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:72) at org.ovirt.engine.core.common.interfaces.BackendLocal$$$view9.RunQuery(Unknown Source) at org.ovirt.engine.ui.frontend.server.gwt.GenericApiGWTServiceImpl.RunQuery(GenericApiGWTServiceImpl.java:51) at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at com.google.gwt.rpc.server.RPC.invokeAndStreamResponse(RPC.java:196) at com.google.gwt.rpc.server.RpcServlet.processCall(RpcServlet.java:161) at com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:222) at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:489) at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.rewrite.RewriteValve.invoke(RewriteValve.java:466) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505) at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:445) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) at java.lang.Thread.run(Thread.java:722) - DHC

3 3

[Engine-devel] UI Plugins: PoC patch revision 5 is here
by Vojtech Szocs 21 Sep '12

21 Sep '12

------=_Part_2529172_1797931071.1348259851826 Content-Type: multipart/alternative; boundary="----=_Part_2529173_585113360.1348259851826" ------=_Part_2529173_585113360.1348259851826 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi guys, it's been a while but here comes the latest revision of UI Plugins proof-of-concept patch (please find it attached). This revision was originally meant to focus solely on server-side components of the plugin infrastructure. However, I ended up implementing all the major concepts and ideas as discussed on engine-devel mailing list, impacting both client-side and server-side parts of the plugin infrastructure. As a result, UI plugin infrastructure should be pretty much complete now, so we can focus on specific plugin API features in upcoming PoC revisions. There's a whole bunch of changes and improvements in this revision, so I'll try to cover all the relevant parts step by step. If you have any comments, questions or ideas, please let me know! So here we go... (or if you just want to get the patch, find the link at the end of this message) 0. Added new Engine configuration values UI plugin data path is represented by ConfigValues.UIPluginDataPath enum option ("UIPluginDataPath" in vdc_options table), and resolved relative to ConfigValues.DataDir if possible. Following (default) values: * UIPluginDataPath = ui-plugins * DataDir = /usr/share/ovirt-engine result in UI plugin data path: /usr/share/ovirt-engine/ui-plugins UI plugin config path is represented by ConfigValues.UIPluginConfigPath enum option ("UIPluginConfigPath" in vdc_options table), and resolved relative to ConfigValues.ConfigDir if possible. Following (default) values: * UIPluginConfigPath = ui-plugins * ConfigDir = /etc/ovirt-engine result in UI plugin config path: /etc/ovirt-engine/ ui-plugins 1. Processing UI plugin data on the server PluginDataManager is the class responsible for reading, validating and caching UI plugin descriptor/configuration data on the server (Engine). It has two main responsibilities: * return a snapshot of currently valid plugin data ( getCurrentData method ) * reload plugin data from local file system if necessary ( reloadData method) The reloadData method doesn't modify "live" plugin data directly. Instead, it creates a local working copy of current plugin data, updates this copy as it reads/validates plugin descriptor and configuration files, and attempts to update "live" plugin data through conditional reference re-assignment (using java.util.concurrent.atomic.AtomicReference.compareAndSet method). In other words, reloadData method makes no attempts with regard to Java lock-based synchronization, in favor of dealing with "live" data through AtomicReference (reference that involves atomic volatile reads and writes): * In the best case, a thread will succeed in updating "live" data ( AtomicReference.compareAndSet == true), which means that "live" data remained unchanged since this thread acquired a reference of current plugin data. * In the worst case, a thread will NOT succeed in updating "live" data ( AtomicReference.compareAndSet == false), which means that "live" data was already changed by another thread since this thread acquired a reference of current plugin data. In my opinion, when dealing with external resources like the local file system, this is a good compromise between performance and up-to-date data. While we might not get "completely-up-to-date" data at the given point in time ( reloadData + getCurrentData ), we are guaranteed to get "recently-up-to-date" and consistent data. In other words, the requirement of "completely-up-to-date" data would involve synchronized statements that would hurt performance. In my (very humble) opinion, the benefit of having "completely-up-to-date" data , at the cost of reduced performance, is not really worth it, especially in our case when the user can just hit refresh (F5) to reload WebAdmin and its plugin data. Plugin descriptor files are expected to be placed in UI plugin data path , for example: /usr/share/ovirt-engine/ui-plugins/foo.json Following descriptor file attributes are implemented and recognized by the plugin infrastructure: * name : A name that uniquely identifies the plugin (required attribute). * url : URL of plugin host page that invokes the plugin code (required attribute). * config : Default configuration object associated with the plugin (optional attribute). * resourcePath : Path to plugin static resources, relative to UI plugin data path (optional attribute). This is used when serving plugin files through Engine PluginResourceServlet (more on this below). Plugin configuration files are expected to be placed in UI plugin config path, for example: /etc/engine/ui-plugins/foo-config.json Note that plugin configuration files follow the "<descriptorFileName>-config.json" convention. Following configuration file attributes are implemented and recognized by the plugin infrastructure: * config : Custom configuration object associated with the plugin (optional attribute). This overrides the default plugin descriptor configuration, if any. * enabled : Indicates whether the plugin should be loaded on WebAdmin startup (optional attribute). Default value is 'true'. * order : Defines the relative order in which the plugin will be loaded on WebAdmin startup (optional attribute). Default value is Integer.MAX_VALUE (lowest order). The concept of merging custom configuration ( config attribute in foo-config.json ), if any, on top of default configuration ( config attribute in foo.json ), if any, remains unchanged. This makes the plugin configuration quite flexible - in my opinion, the added complexity of handling/merging such configuration is definitely worth the effort. The enabled attribute is straight-forward, allowing users to turn the given plugin off, if necessary. In future, users should still be able to load such plugins through WebAdmin GUI. The order attribute controls the order in which plugins are loaded on WebAdmin startup. Since plugin resources are fetched asynchronously by the browser, this is basically a way of imposing some degree of determinism in the "generally-non-deterministic" plugin environment, which is helpful when troubleshooting problems with multiple plugins. This attribute is also helpful due to file listing methods in java.io.File giving no guarantees that files would be listed in any particular order (otherwise we could just go for the "NN-<descriptorFileName>.json" convention, with NN being the order number). 2. Modified behavior of WebadminDynamicHostingServlet WebadminDynamicHostingServlet is the servlet used to serve WebAdmin application host page (HTML page that bootstraps WebAdmin JavaScript code). In addition to its former behavior, as part of handling the given request, WebadminDynamicHostingServlet : * reloads descriptor/configuration data from local file system if necessary, and obtains a snapshot of currently valid plugin data ( PluginDataManager.reloadAndGetCurrentData ) * embeds all plugin meta-data, suitable for use in client-side plugin infrastructure , into WebAdmin host page as "pluginDefinitions" JavaScript a rray ( PluginDefinitions ) As a result, reloading UI plugin descriptor/configuration data is as simple as refreshing (F5) WebAdmin application in the browser (no need to restart Engine). 3. Added servlet for serving plugin static resources PluginResourceServlet is the servlet used to serve UI plugin static files (plugin host page, 3rd party JavaScript, etc.) from the local file system. For example, requesting URL: * http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/start.html will send the content of: * /usr/share/ovirt-engine/ui-plugins/<resourcePath>/ content/start.html to the client. As shown in the above example: * /webadmin/webadmin/plugin/ is the servlet root path for PluginResourceServlet * in the extra path beyond the servlet root path ( /foo/content/start.html ): * /foo represents the name of the plugin * /content/start.html represents the path to requested resource, relative to " UIPluginDataPath / < resourcePath >" Note that each plugin using PluginResourceServlet to serve its static files must declare non-empty resourcePath attribute in within the plugin descriptor. Also note that PluginResourceServlet , unlike WebadminDynamicHostingServlet , does NOT reload descriptor/configuration data from local file system as part of handling the given request. In other words, it's assumed that plugin data has already been (re)loaded when serving WebAdmin application host page, with subsequent requests to PluginResourceServlet reading the current plugin information. Until we solve the cross-origin issue in a clean way, PluginResourceServlet should be used to serve all plugin resources from local file system. 4. Plugin lifecycle improved to deal with misbehaving plugins PluginState enum has been modified to deal with plugins that allow uncaught exceptions to escape from plugin event handler functions (e.g. "UiInit"): * removed state INITIALIZED * added state INITIALIZING : The plugin is (currently) being initialized by calling UiInit event handler function. * added state IN_USE : Plugin's UiInit event handler function has completed successfully, we can now call other event handler functions as necessary. The plugin is in use now. * added state FAILED : An uncaught exception escaped while calling an event handler function, which indicates internal error within the plugin code. The plugin is removed from service. I've attached a simple state diagram that illustrates different states and transitions between them (green color is initial state, red color is end state). Uncaught exceptions in plugin event handler functions will be caught and handled by the plugin infrastructure. This prevents a misbehaving plugin from breaking WebAdmin application, since WebAdmin is the caller (initiator) of the function call. In such case, the plugin will be removed from service. Update on cross-origin issue (consequence of same-origin policy) In order for the plugin to access WebAdmin plugin API, plugin host page (e.g. start.html ) must be served from URL on same origin as Engine origin. Otherwise, plugin code running in the context of an iframe'd host page will fail to evaluate "parent.pluginApi" expression, with "parent" being top-level (WebAdmin) window, and "pluginApi" being the global plugin API object exposed by WebAdmin. This is why PluginResourceServlet , available on Engine origin, should be used to serve all plugin resources from local file system. There's only one issue that remains to be solved: cross-origin "plugin vs. remote service" communication, with "remote service" being anything other than Engine (REST API). In future, we'll address this with Apache reverse proxy configuration, so that users can configure Apache server (placed in front of Engine JBoss AS) to put arbitrary (local or remote non-Engine) services on same origin. However, this requires a change in current Apache configuration. Until then, users can manually edit the Engine Apache configuration file ( /etc/httpd/conf.d/ovirt-engine.conf ). I've attached some sample plugin files for you to experiment with. Instead of attaching actual patch file (92 kB) to this email, I've submitted the patch to oVirt Gerrit: http://gerrit.ovirt.org/8120 Let me know what you think! Cheers, Vojtech ------=_Part_2529173_585113360.1348259851826 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'>p { margin: 0; }</style></head><body><= div style=3D'font-family: times new roman,new york,times,serif; font-size: = 12pt; color: #000000'>Hi guys, it's been a while but here comes the= latest revision of UI Plugins proof-of-concept patch (please find it attac= hed). This revision was originally meant to focus solely on server-s= ide components of the plugin infrastructure. However, I ended up implementi= ng all the major concepts and ideas as discussed on engine-devel mailing li= st, impacting both client-side and server-side parts of the plugin infrastr= ucture. As a result, UI plugin infrastructure should be pretty much complet= e now, so we can focus on specific plugin API features in upcoming PoC rev= isions. There's a whole bunch of changes and improvements in this re= vision, so I'll try to cover all the relevant parts step by step. If you ha= ve any comments, questions or ideas, please let me know! So here we = go... (or if you just want to get the patch, find the link at the end of th= is message) <hr style=3D"width: 100%; height: 2px;"> 0. A= dded new Engine configuration values UI plugin data path is represented by ConfigValues.UIPlug= inDataPath enum option ("UIPluginDataPath" in vdc_options table), and resolved relative to ConfigValues.DataDir if possible. Following= (default) values: <ul><li>UIPluginD= ataPath =3D ui-plugins</li><li>D= ataDir =3D /usr/share/ovirt-engine </li></ul>result in UI plugin = data path: /usr/share/ovirt-engine/ui-p= lugins UI plugin = config path is represented by Co= nfigValues.UIPluginConfigPath enum option ("UIPluginConfigPath" in <= span style=3D"font-style: italic;">vdc_options table), and resolved = relative to ConfigValues.ConfigDir</spa= n> if possible. Following (default) values: <ul><li>UIPluginConfigPath =3D ui-plugins</li><li>ConfigDir =3D /etc/ovirt-engine</li></ul><= p>result in UI plugin config path: /etc= /ovirt-engine/ui-plugins<= /p> 1. Processing UI plugin data on t= he server PluginDataManager is the class responsible for reading= , validating and caching UI plugin descriptor/configuration data on the ser= ver (Engine). It has two main responsibilities: <ul><li>return a snapsho= t of currently valid plugin data (getCu= rrentData method) </li><li>reload plugin data from local file sys= tem if necessary (reloadData met= hod)</li></ul>The reloadData<= /span> method doesn't modify "live" plugin data directly. Instead, it creat= es a local working copy of current plugin data, updates this copy as it rea= ds/validates plugin descriptor and configuration files, and attempts to upd= ate "live" plugin data through conditional reference re-assignment (using <= span style=3D"font-style: italic;">java.util.concurrent.atomic.AtomicRefere= nce.compareAndSet method). In other words, reloadData method makes no attempts with= regard to Java lock-based synchronization, in favor of dealing with "live"= data through AtomicReference (r= eference that involves atomic volatile<= /span> reads and writes):<ul><li> In the best case, a thread will succe= ed in updating "live" data (AtomicRefer= ence.compareAndSet =3D=3D true), which means that "live" data remain= ed unchanged since this thread acquired a reference of current plugin data.= </li><li>In the worst case, a thread will NOT succeed in updating "live" da= ta (AtomicReference.compareAndSet</span= > =3D=3D false), which means that "live" data was already changed by anothe= r thread since this thread acquired a reference of current plugin data.</li= ></ul>In my opinion, when dealing with external resources like the local= file system, this is a good compromise between performance and up-to-date = data. While we might not get "completely-up-to-date" data at the given poin= t in time (reloadData + getCurrentData), we are guaranteed to ge= t "recently-up-to-date" and consistent data. In other words, the requiremen= t of "completely-up-to-date" data would involve synchronized statements that would hurt performance. In my = (very humble) opinion, the benefit of having "completely-up-to-date" data,= at the cost of reduced performance, is not really worth it, especially in = our case when the user can just hit refresh (F5) to reload WebAdmin and its= plugin data. Plugin descriptor files are expected to be placed in UI plugin d= ata path, for example: /usr/share/ovirt= -engine/ui-plugins/foo.json Following descriptor fi= le attributes are implemented and recognized by the plugin infrastructure:<= /p><ul><li>name: A name that uni= quely identifies the plugin (required attribute).</li><li>url: URL of plugin host page that invokes the plu= gin code (required attribute).</li><li>= config: Default configuration object associated with the plugin (opt= ional attribute).</li><li>resourcePath<= /span>: Path to plugin static resources, relative to UI plugin data path (o= ptional attribute). This is used when serving plugin files through Engine <= span style=3D"font-style: italic;">PluginResourceServlet (more on th= is below). </li></ul>Plugin configuration files are expected to be placed in UI plugin= config path, for example: /etc/engine/= ui-plugins/foo-config.json Note that plugin con= figuration files follow the "<descriptorFileName>-config.json" conven= tion. Following configuration file attributes are implemen= ted and recognized by the plugin infrastructure:<ul><li>config: Custom configuration object associated = with the plugin (optional attribute). This overrides the default plugin des= criptor configuration, if any.</li><li>= enabled: Indicates whether the plugin should be loaded on WebAdmin s= tartup (optional attribute). Default value is 'true'.</li><li>order: Defines the relative order in which = the plugin will be loaded on WebAdmin startup (optional attribute). Default= value is Integer.MAX_VALUE (low= est order).</li></ul>The concept of merging custom configuration (config attribute in foo-config.json), if any, on top of default config= uration (config attribute in <sp= an style=3D"font-style: italic;">foo.json), if any, remains unchange= d. This makes the plugin configuration quite flexible - in my opinion, the = added complexity of handling/merging such configuration is definitely worth= the effort. The e= nabled attribute is straight-forward, allowing users to turn the giv= en plugin off, if necessary. In future, users should still be able to load = such plugins through WebAdmin GUI. The order attribute controls the order in which plu= gins are loaded on WebAdmin startup. Since plugin resources are fetched asy= nchronously by the browser, this is basically a way of imposing some degree= of determinism in the "generally-non-deterministic" plugin environment, wh= ich is helpful when troubleshooting problems with multiple plugins. This at= tribute is also helpful due to file listing methods in java.io.File giving no guarantees that files would b= e listed in any particular order (otherwise we could just go for the "NN-&l= t;descriptorFileName>.json" convention, with NN being the order number).= 2. Modified behavior of Weba= dminDynamicHostingServlet WebadminDynamicHostingServlet is the s= ervlet used to serve WebAdmin application host page (HTML page that bootstr= aps WebAdmin JavaScript code). In addition to its former behavior, a= s part of handling the given request, W= ebadminDynamicHostingServlet: <ul><li>reloads descriptor/configuration data from local file syste= m if necessary, and obtains a snapshot of currently valid plugin data (<spa= n style=3D"font-style: italic;">PluginDataManager.reloadAndGetCurrentData</= span>)</li><li>embeds all plugin meta-data, suitable for use in client-side= plugin infrastructure, into WebAdmin host page as "pluginDefinitions" Java= Script array (PluginDefinitions)= </li></ul>As a result, reloading UI plugin descriptor/configuration dat= a is as simple as refreshing (F5) WebAdmin application in the browser (no n= eed to restart Engine). 3. Added = servlet for serving plugin static resources PluginResourceServlet</span= > is the servlet used to serve UI plugin static files (plugin host page, 3r= d party JavaScript, etc.) from the local file system. For example, r= equesting URL: <ul><li>http://<En= gineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/start.html</s= pan></li></ul>will send the content of:<ul><li>/usr/share/ovirt-engine/ui-plugins/<resourcePath>/</sp= an>content/start.html</li></ul><= p>to the client. As shown in the above example:<ul><li= >/webadmin/webadmin/plugin/ is t= he servlet root path for PluginResource= Servlet </li><li>in the extra path beyond the servlet root path (= /foo/content/start.html):</li><ul><li>/foo represents the name of the plugin</li><li>/content/start.html represents the path to requ= ested resource, relative to "UIPluginDataPath / <resourcePath>" </= li></ul></ul>Note that each plugin using PluginResourceServlet to serve its static files must declare non-e= mpty resourcePath attribute in w= ithin the plugin descriptor. Also note that PluginResourceServlet, unlike WebadminDynamicHostingServlet, does NOT reload descriptor/= configuration data from local file system as part of handling the given req= uest. In other words, it's assumed that plugin data has already been (re)lo= aded when serving WebAdmin application host page, with subsequent requests = to PluginResourceServlet reading= the current plugin information. Until we solve the cross-origin iss= ue in a clean way, PluginResourceServle= t should be used to serve all plugin resources from local file syste= m. 4. Plugin lifecycle improved t= o deal with misbehaving plugins PluginState enum has been modified to deal with plugins that = allow uncaught exceptions to escape from plugin event handler functions (e.= g. "UiInit"): <ul><li>removed state = INITIALIZED</li><li>added state = INITIALIZING: The plugin is (currently) being initialized by calling= UiInit event handler function.</li><li>added state IN_USE: Plugin's UiInit event handler function has comp= leted successfully, we can now call other event handler functions as necess= ary. The plugin is in use now.</li><li>added state FAILED: An uncaught exception escaped while calling an e= vent handler function, which indicates internal error within the plugin cod= e. The plugin is removed from service. </li></ul>I've attached a simple = state diagram that illustrates different states and transitions between the= m (green color is initial state, red color is end state). Uncaught e= xceptions in plugin event handler functions will be caught and handled by t= he plugin infrastructure. This prevents a misbehaving plugin from breaking = WebAdmin application, since WebAdmin is the caller (initiator) of the funct= ion call. In such case, the plugin will be removed from service. <sp= an style=3D"font-weight: bold;">Update on cross-origin issue (consequence o= f same-origin policy) In order for the plugin to access WebAd= min plugin API, plugin host page (e.g. = start.html) must be served from URL on same origin as Engine origin.= Otherwise, plugin code running in the context of an iframe'd host page wil= l fail to evaluate "parent.pluginApi" expression, with "parent" being top-l= evel (WebAdmin) window, and "pluginApi" being the global plugin API object = exposed by WebAdmin. This is why PluginResourceServlet, available on Engine origin, should be used t= o serve all plugin resources from local file system. There's only on= e issue that remains to be solved: cross-origin "plugin vs. remote service"= communication, with "remote service" being anything other than Engine (RES= T API). In future, we'll address this with Apache reverse proxy configurati= on, so that users can configure Apache server (placed in front of Engine JB= oss AS) to put arbitrary (local or remote non-Engine) services on same orig= in. However, this requires a change in current Apache configuration. Until = then, users can manually edit the Engine Apache configuration file (/etc/httpd/conf.d/ovirt-engine.conf).<b= r> <hr style=3D"width: 100%; h= eight: 2px;"> I've attached some sample plugin files for you to experime= nt with. Instead of attaching actual patch file (92 kB) to this email, I've= submitted the patch to oVirt Gerrit: http://gerrit.ovirt.org/8120 L= et me know what you think! Cheers, Vojtech </div></body></= html> ------=_Part_2529173_585113360.1348259851826-- ------=_Part_2529172_1797931071.1348259851826 Content-Type: application/x-compressed-tar; name=ui-plugin-sample-files.tar.gz Content-Disposition: attachment; filename=ui-plugin-sample-files.tar.gz Content-Transfer-Encoding: base64 H4sIAOnHXFAAA+1abVMjNxLmq/0rFH8BUjZ+t684lipu2VRI7Qu1gdxdvlzJM7ItGI8mGo2BbO1/ z9PSzNgmgGEDzl6turZie0bqbvXT6n4kIkzQ3HphaUGGw777HPRWPnPZandanWG71+13Olutdrvb am+x/ks7RpKlhmvGtubp7ypI7x+37v3/qQjgL+KJjMXLpcHT8e/0ewOP/yZkCf9MNpIow9f0mVPh KfgPsPFb7d6g1/L4b0KyVH+V9b879PhvQgj/dMr1C5b/L6n/vZ7v/xuRBf4vxwKejn932PL9fyPy J/xfgAU8qf93B8AfLMD3/43IQ/iPlWqMZST+aiZYvPuPwx//Bf7DwaDr8d+EPIT/iOuN4j8YtLud vsO/3/H4b0Ieh3+gYiNi84V58IT930bv32p12t2W5/8bkbvP/1T5gflYTvYuUhX/RRsE8KDXuw// NnZ+vv9b3SHh3x72B9j/rWdZ4Rr5xvH/VK1Wmt9XK+x79hqhUDPmcM80N1LFTI0uRGAYT1MVSG5E yK6kmTIzFcwlC9tRCY3kEePGaDnKjNjdswrPpjJlai60lqFI7ZxQjHkWmWIuHgdaJkbpVbN1JseM 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1 0

[Engine-devel] Duplicities in tranlations
by David Jaša 20 Sep '12

20 Sep '12

Hi, given that my language is not yet included in language set in Zanata (why?), I've had a look at existing translation - and I noticed non-negligible number of duplicities in the translation: for example, just trio of "Create", "Delete" and "Edit Properties" was repeated six times on the first page of LocalizedEnums! This is a recipe for translater frutration at best and translation errors at worst. Can there be some guideline and effort to limit proliferation of new strings by reusing existing ones? David -- David Jaša, RHCE SPICE QE based in Brno GPG Key: 22C33E24 Fingerprint: 513A 060B D1B4 2A72 7F0D 0278 B125 CD00 22C3 3E24

2 1

Re: [Engine-devel] [Users] base url of ovirt
by Juan Hernandez 20 Sep '12

20 Sep '12

Copying engine-devel, as I think this is something we should discuss and maybe do. On 09/18/2012 10:50 PM, Jon Thomas wrote: > Is there some config in the engine to set up the web interface base url > so that instead of https://localhost.localdomain/ it is > https://localhost.localdomain/ovirt ? No, there is no such config. I think this should be the default, I mean, we should have this /ovirt prefix in all our URLs, to make coexistence with other users of the web server easy. -- Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta 3ºD, 28016 Madrid, Spain Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.

3 5

[Engine-devel] ovirt-cli 3.2.0.3 - important changes
by Michael Pasternak 20 Sep '12

20 Sep '12

Two commands renamed: -------------------- - "create" command renamed with "add" #855773. - "delete" command renamed with "remove" #855769. Changed authentication procedure: -------------------------------- - added username/password prompt/conf-file functionality (see [1] for more details). [1] http://wiki.ovirt.org/wiki/CLI#Connect * For complete list of changes, see change log. -- Michael Pasternak RedHat, ENG-Virtualization R&D

1 0

[Engine-devel] Upstream git repo hung
by Dhandapani 20 Sep '12

20 Sep '12

This is a multi-part message in MIME format. --------------050104080601090706000007 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit I got, /fatal: The remote end hung up unexpectedly/ -- Regards, Dhandapani --------------050104080601090706000007 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> <tt>I got, </tt><tt>fatal: The remote end hung up unexpectedly</tt><tt> </tt><tt> </tt><tt>--</tt><tt> </tt><tt>Regards,</tt><tt> </tt><tt>Dhandapani</tt><tt> </tt> </body> </html> --------------050104080601090706000007--

4 7

[Engine-devel] gwt error with nightly engine builds and IE8/9
by Dead Horse 19 Sep '12

19 Sep '12

I have been seeing this issue with the latest nightly engine builds for quite a few weeks now with Internet Explorer Version 8 and 9. ERROR: Possible problem with your *.gwt.xml module file. The compile time user.agent value (gecko1_8) does not match the runtime user.agent value (ie9). Expect more errors. Is this a known issue? - DHC

2 1

[Engine-devel] upgrade scripts - Please keep keys ordered
by Yair Zaslavsky 16 Sep '12

16 Sep '12

At config_0000.sql (backend/manager/dbscripts/upgrade/pre_upgrade directory) at Alphabetic order. Kind regards, Yair

1 0