Merge "Add REST endpoint to get a task"

Documentation/rest-api-config.txt

@@ -691,6 +691,46 @@ command.
   ]
 ----
 
+[[get-task]]
+=== Get Task
+--
+'GET /config/server/tasks/link:#task-id[\{task-id\}]'
+--
+
+Retrieves a task from the background work queue that the Gerrit daemon
+is currently performing, or will perform in the near future.
+
+End-users may see a task only if they can also see the project the task
+is associated with. Tasks operating on other projects, or that do not
+have a specific project, are hidden.
+
+Members of a group that is granted the
+link:access-control.html#capability_viewQueue[View Queue] capability or
+the link:access-control.html#capability_administrateServer[Administrate
+Server] capability can see all tasks.
+
+As result a link:#task-info[TaskInfo] entity is returned.
+
+.Request
+----
+  GET /config/server/tasks/1e688bea HTTP/1.0
+----
+
+.Response
+----
+  HTTP/1.1 200 OK
+  Content-Type: application/json;charset=UTF-8
+
+  )]}'
+  {
+    "id": "1e688bea",
+    "state": "SLEEPING",
+    "start_time": "2014-06-11 12:58:51.991000000",
+    "delay": 3453,
+    "command": "Reload Submit Queue"
+  }
+----
+
 [[get-top-menus]]
 === Get Top Menus
 --
@@ -741,6 +781,10 @@ plugin name: "<plugin-name>-<cache-name>".
 Gerrit core caches can optionally be prefixed with "gerrit":
 "gerrit-<cache-name>".
 
+[[task-id]]
+=== \{task-id\}
+The ID of the task (hex string).
+
 
 [[json-entities]]
 == JSON Entities

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/config/GetTaskIT.java

@@ -0,0 +1,67 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.rest.config;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.RestResponse;
+import com.google.gerrit.server.config.ListTasks.TaskInfo;
+import com.google.gson.reflect.TypeToken;
+
+import org.apache.http.HttpStatus;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.List;
+
+public class GetTaskIT extends AbstractDaemonTest {
+
+  @Test
+  public void getTask() throws IOException {
+    RestResponse r =
+        adminSession.get("/config/server/tasks/" + getLogFileCompressorTaskId());
+    assertEquals(HttpStatus.SC_OK, r.getStatusCode());
+    TaskInfo info =
+        newGson().fromJson(r.getReader(),
+            new TypeToken<TaskInfo>() {}.getType());
+    assertNotNull(info.id);
+    Long.parseLong(info.id, 16);
+    assertEquals("Log File Compressor", info.command);
+    assertNotNull(info.startTime);
+  }
+
+  @Test
+  public void getTask_NotFound() throws IOException {
+    RestResponse r =
+        userSession.get("/config/server/tasks/" + getLogFileCompressorTaskId());
+    assertEquals(HttpStatus.SC_NOT_FOUND, r.getStatusCode());
+  }
+
+  private String getLogFileCompressorTaskId() throws IOException {
+    RestResponse r = adminSession.get("/config/server/tasks/");
+    List<TaskInfo> result =
+        newGson().fromJson(r.getReader(),
+            new TypeToken<List<TaskInfo>>() {}.getType());
+    r.consume();
+    for (TaskInfo info : result) {
+      if ("Log File Compressor".equals(info.command)) {
+        return info.id;
+      }
+    }
+    return null;
+  }
+}

gerrit-server/src/main/java/com/google/gerrit/server/config/GetTask.java

@@ -0,0 +1,28 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.config;
+
+import com.google.gerrit.extensions.restapi.RestReadView;
+import com.google.gerrit.server.config.ListTasks.TaskInfo;
+import com.google.inject.Singleton;
+
+@Singleton
+public class GetTask implements RestReadView<TaskResource> {
+
+  @Override
+  public TaskInfo apply(TaskResource rsrc) {
+    return new TaskInfo(rsrc.getTask());
+  }
+}

gerrit-server/src/main/java/com/google/gerrit/server/config/Module.java

@@ -31,6 +31,7 @@ public class Module extends RestApiModule {
     DynamicMap.mapOf(binder(), TOP_MENU_KIND);
     child(CONFIG_KIND, "capabilities").to(CapabilitiesCollection.class);
     child(CONFIG_KIND, "tasks").to(TasksCollection.class);
+    get(TASK_KIND).to(GetTask.class);
     child(CONFIG_KIND, "top-menus").to(TopMenuCollection.class);
     get(CONFIG_KIND, "version").to(GetVersion.class);
     get(CONFIG_KIND, "preferences").to(GetPreferences.class);

gerrit-server/src/main/java/com/google/gerrit/server/config/TaskResource.java

@@ -15,9 +15,20 @@
 package com.google.gerrit.server.config;
 
 import com.google.gerrit.extensions.restapi.RestView;
+import com.google.gerrit.server.git.WorkQueue.Task;
 import com.google.inject.TypeLiteral;
 
 public class TaskResource extends ConfigResource {
   public static final TypeLiteral<RestView<TaskResource>> TASK_KIND =
       new TypeLiteral<RestView<TaskResource>>() {};
+
+  private final Task<?> task;
+
+  public TaskResource(Task<?> task) {
+    this.task = task;
+  }
+
+  public Task<?> getTask() {
+    return task;
+  }
 }

gerrit-server/src/main/java/com/google/gerrit/server/config/TasksCollection.java

@@ -15,11 +15,20 @@
 package com.google.gerrit.server.config;
 
 import com.google.gerrit.extensions.registration.DynamicMap;
+import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.ChildCollection;
 import com.google.gerrit.extensions.restapi.IdString;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.RestView;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.git.WorkQueue;
+import com.google.gerrit.server.git.WorkQueue.ProjectTask;
+import com.google.gerrit.server.git.WorkQueue.Task;
+import com.google.gerrit.server.project.ProjectCache;
+import com.google.gerrit.server.project.ProjectState;
 import com.google.inject.Inject;
+import com.google.inject.Provider;
 import com.google.inject.Singleton;
 
 @Singleton
@@ -27,12 +36,19 @@ public class TasksCollection implements
     ChildCollection<ConfigResource, TaskResource> {
   private final DynamicMap<RestView<TaskResource>> views;
   private final ListTasks list;
+  private final WorkQueue workQueue;
+  private final Provider<IdentifiedUser> self;
+  private final ProjectCache projectCache;
 
   @Inject
-  TasksCollection(DynamicMap<RestView<TaskResource>> views,
-      ListTasks list) {
+  TasksCollection(DynamicMap<RestView<TaskResource>> views, ListTasks list,
+      WorkQueue workQueue, Provider<IdentifiedUser> self,
+      ProjectCache projectCache) {
     this.views = views;
     this.list = list;
+    this.workQueue = workQueue;
+    this.self = self;
+    this.projectCache = projectCache;
   }
 
   @Override
@@ -42,8 +58,30 @@ public class TasksCollection implements
 
   @Override
   public TaskResource parse(ConfigResource parent, IdString id)
-      throws ResourceNotFoundException {
-    throw new ResourceNotFoundException(id);
+      throws ResourceNotFoundException, AuthException {
+    CurrentUser user = self.get();
+    if (!user.isIdentifiedUser()) {
+      throw new AuthException("Authentication required");
+    }
+
+    try {
+      int taskId = (int) Long.parseLong(id.get(), 16);
+      Task<?> task = workQueue.getTask(taskId);
+      if (task != null) {
+        if (self.get().getCapabilities().canViewQueue()) {
+          return new TaskResource(task);
+        } else if (task instanceof ProjectTask) {
+          ProjectTask<?> projectTask = ((ProjectTask<?>) task);
+          ProjectState e = projectCache.get(projectTask.getProjectNameKey());
+          if (e != null && e.controlFor(user).isVisible()) {
+            return new TaskResource(task);
+          }
+        }
+      }
+      throw new ResourceNotFoundException(id);
+    } catch (NumberFormatException e) {
+      throw new ResourceNotFoundException(id);
+    }
   }
 
   @Override