Multi-instance Support (#311)

CHANGELOG.md

@@ -2,6 +2,73 @@
 
 ## 20.0-SNAPSHOT - unreleased
 
+### 🎁 New Features
+
+* Hoist Core v20 provides support for running multi-instance clusters of Hoist application servers.
+  Cluster management is provided by the use of Hazelcast (www.hazelcast.com), an open-source library
+  providing embedded java support for inter-server communication, co-ordination, and data sharing.
+  See the new `ClusterService.groovy` service, which provides the clustering implementation and main
+  API entry point for accessing the cluster.
+  ** Applications/client plugins upgrading to v18 will need to provide a cluster configuration class
+  with the name `ClusterConfig.groovy`.  See toolbox for an example of this file.
+  ** Applications should fix their Hazelcast version with the following line in their gradle.properties:
+  `hazelcast.version=5.3.6`
+  ** Applications that intend to run with more than one server *must* enable sticky sessions when
+  routing clients to servers.  This is critical for the correct operation of authentication
+  and web socket communications.
+  ** Many applications will *not* need to implement additional changes beyond the above to
+  run with multi-instances; Hoist will setup the cluster, elect a master instance,  provide
+  cluster-aware hibernate caching and logging, and ensure cross-server consistency for its own
+  APIs.
+  ** However, complex applications -- especially applications with state, workflow, or business
+  logic -- should take care to ensure the app is safe to run in multi-instance mode. Distributed
+  data structures (e.g. Hazelcast  Maps) should be used as needed, as well as limiting certain
+  actions to the "master" server.  See toolbox, or Hoist for help.
+  ** `hoist-react >= 64.0` is required.
+* New support for reporting of service statistics for trobuleshooting/monitoring.  Implement
+  `BaseService.getAdminStats()` to provide diagnostic metadata about the state of your service that
+  will then be displayed in the admin client.
+* All `Throwable`s are now serialized to JSON by default using Hoist's standard customization of
+  Jackson.
+
+### Breaking Changes
+* The following server-side Hoist events are now implemented as cluster-wide Hazelcast messages
+  rather than single-server Grails events:
+  ** 'xhFeedbackReceived', 'xhClientErrorReceived', 'xhConfigChanged', and 'xhMonitorStatusReport'
+  Any applications that are listening to these events with `BaseService.subscribe` should instead use
+  the new cluster aware method `BaseService.subscribeToTopic`.
+* The `exceptionRenderer` singleton has been simplified and renamed as `xhExceptionHandler`. This
+  change was needed to better support cross-cluster exception handling. This object is used by
+  Hoist internally for catching uncaught exceptions and this change is not expected to impact
+  most applications.
+
+* New support for Role Management.
+    * Hoist now supports an out-of-the-box, database-driven system for maintaining a hierarchical
+      set of roles and associating them with individual users.
+    * New system supports app and plug-in specific integrations to AD and other enterprise systems.
+    * Hoist-react `v64` is now required and will provide an administrative UI to visualize and
+      manage the new role system.
+    * See `DefaultRoleService` for more information.
+
+### ⚙️ Technical
+
+* Add `xh/echoHeaders` utility endpoint. Useful for verifying headers (e.g. `jespa_connection_id`)
+  that are installed by or must pass through multiple ingresses/load balancers.
+* Remove HTML tag escaping when parsing alert banner create/update request JSON.
+
+### 💥 Breaking Changes
+
+* Applications will typically need to adjust their implementation of `BaseRoleService`. Most
+  applications are expected to adopt the new provided `DefaultRoleService`, and may be required to
+  migrate existing code/data to the new API. Applications that wish to continue to use a completely
+  custom `BaseRoleService` will need to implement one additional method: `getUsersForRole`.
+
+### 📚 Libraries
+* grails `6.1.0`
+* gorm `8.0.1`
+* hazelcast `5.3.6`
+
+
 ## 19.0.0 - 2024-04-04
 
 ### 💥 Breaking Changes (upgrade difficulty: 🟢 LOW - latest Hoist React + DB col additions)

build.gradle

@@ -54,16 +54,17 @@ dependencies {
     //--------------------
     // Hoist Additions
     //--------------------
+
+    api "com.hazelcast:hazelcast"
+
     api "org.apache.tomcat:tomcat-jdbc"
     api "org.codehaus.groovy:groovy-dateutil:$groovyVersion"
 
     // Quartz, with Grails 4/5 workaround (https://github.com/grails-plugins/grails-quartz/issues/107
     api("org.quartz-scheduler:quartz:2.3.2") {exclude group: 'slf4j-api', module: 'c3p0'}
     api 'org.grails.plugins:quartz:2.0.13'
 
-    api "org.hibernate:hibernate-core:5.6.11.Final"
-    api "org.hibernate:hibernate-ehcache:5.6.11.Final"
-    api "net.sf.ehcache:ehcache:2.10.9.2"
+    api "org.hibernate:hibernate-jcache"
 
     api "org.apache.poi:poi:4.1.2"
     api "org.apache.poi:poi-ooxml:4.1.2"
@@ -72,10 +73,14 @@ dependencies {
     api "org.apache.directory.api:api-all:2.1.3"
 
     api "org.springframework:spring-websocket"
-    api "org.apache.httpcomponents.client5:httpclient5:5.1.2"
+    api "org.apache.httpcomponents.client5:httpclient5:5.2.1"
     api 'org.jasypt:jasypt:1.9.3'
     api "commons-io:commons-io:2.8.0"
     api "org.owasp.encoder:encoder:1.2.3"
+
+    api "com.esotericsoftware:kryo:5.5.0"
+    api "info.jerrinot:subzero-core:0.11"
+
 }
 
 

gradle.properties

@@ -1,11 +1,12 @@
 xhReleaseVersion=20.0-SNAPSHOT
 
-grailsVersion=6.0.0
-grailsGradlePluginVersion=6.0.0
-grailsHibernatePluginVersion=8.0.0
+grailsVersion=6.1.2
+grailsGradlePluginVersion=6.1.2
+grailsHibernatePluginVersion=8.1.0
 groovyVersion=3.0.11
-gormVersion=8.0.0
+gormVersion=8.1.0
 logback.version=1.2.7
+hazelcast.version=5.3.6
 
 org.gradle.daemon=true
 org.gradle.parallel=true

grails-app/controllers/io/xh/hoist/BaseController.groovy

@@ -11,7 +11,7 @@ package io.xh.hoist
 import grails.async.Promise
 import grails.async.web.WebPromises
 import groovy.transform.CompileStatic
-import io.xh.hoist.exception.ExceptionRenderer
+import io.xh.hoist.exception.ExceptionHandler
 import io.xh.hoist.json.JSONParser
 import io.xh.hoist.json.JSONSerializer
 import io.xh.hoist.log.LogSupport
@@ -26,7 +26,7 @@ import org.slf4j.LoggerFactory
 abstract class BaseController implements LogSupport, IdentitySupport {
 
     IdentityService identityService
-    ExceptionRenderer exceptionRenderer
+    ExceptionHandler xhExceptionHandler
 
     /**
      * Render an object to JSON.
@@ -82,7 +82,7 @@ abstract class BaseController implements LogSupport, IdentitySupport {
         WebPromises.task {
             c.call()
         }.onError { Throwable t ->
-            exceptionRenderer.handleException(t, request, response, this)
+            handleUncaughtInternal(t)
         }
     }
 
@@ -95,7 +95,16 @@ abstract class BaseController implements LogSupport, IdentitySupport {
     // Implementation
     //-------------------
     void handleException(Exception ex) {
-        exceptionRenderer.handleException(ex, request, response, this)
+        handleUncaughtInternal(ex)
+    }
+
+    private void handleUncaughtInternal(Throwable t) {
+        xhExceptionHandler.handleException(
+            exception: t,
+            logTo: this,
+            logMessage: [_action: actionName],
+            renderTo: response
+        )
     }
 
     // Provide cached logger to LogSupport for possible performance benefit