Split payload application code into a subdirectory.

This patch splits from the main libupdate_engine code the part that
is strictly used to download and apply a payload into a new static
library, moving the code to subdirectories. The new library is divided
in two subdirectories: common/ and payload_consumer/, and should not
depend on other update_engine files outside those two subdirectories.
The main difference between those two is that the common/ tools are more
generic and not tied to the payload consumer process, but otherwise they
are both compiled together.

There are still dependencies from the new libpayload_consumer library
into the main directory files and DBus generated files. Those will be
addressed in follow up CLs.

Bug: 25197634
Test: FEATURES=test emerge-link update_engine; `mm` on Brillo.

Change-Id: Id8d0204ea573627e6e26ca9ea17b9592ca95bc23

1 files changed, 103 insertions, 0 deletions

diff --git a/common/action_processor.cc b/common/action_processor.cc
new file mode 100644
index 00000000..c5270a48
--- /dev/null
+++ b/common/action_processor.cc
@@ -0,0 +1,103 @@
+//
+// Copyright (C) 2009 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.
+//
+
+#include "update_engine/common/action_processor.h"
+
+#include <string>
+
+#include <base/logging.h>
+
+#include "update_engine/common/action.h"
+
+using std::string;
+
+namespace chromeos_update_engine {
+
+ActionProcessor::ActionProcessor()
+    : current_action_(nullptr), delegate_(nullptr) {}
+
+ActionProcessor::~ActionProcessor() {
+  if (IsRunning()) {
+    StopProcessing();
+  }
+  for (std::deque<AbstractAction*>::iterator it = actions_.begin();
+       it != actions_.end(); ++it) {
+    (*it)->SetProcessor(nullptr);
+  }
+}
+
+void ActionProcessor::EnqueueAction(AbstractAction* action) {
+  actions_.push_back(action);
+  action->SetProcessor(this);
+}
+
+void ActionProcessor::StartProcessing() {
+  CHECK(!IsRunning());
+  if (!actions_.empty()) {
+    current_action_ = actions_.front();
+    LOG(INFO) << "ActionProcessor::StartProcessing: "
+              << current_action_->Type();
+    actions_.pop_front();
+    current_action_->PerformAction();
+  }
+}
+
+void ActionProcessor::StopProcessing() {
+  CHECK(IsRunning());
+  CHECK(current_action_);
+  current_action_->TerminateProcessing();
+  CHECK(current_action_);
+  current_action_->SetProcessor(nullptr);
+  LOG(INFO) << "ActionProcessor::StopProcessing: aborted "
+            << current_action_->Type();
+  current_action_ = nullptr;
+  if (delegate_)
+    delegate_->ProcessingStopped(this);
+}
+
+void ActionProcessor::ActionComplete(AbstractAction* actionptr,
+                                     ErrorCode code) {
+  CHECK_EQ(actionptr, current_action_);
+  if (delegate_)
+    delegate_->ActionCompleted(this, actionptr, code);
+  string old_type = current_action_->Type();
+  current_action_->ActionCompleted(code);
+  current_action_->SetProcessor(nullptr);
+  current_action_ = nullptr;
+  if (actions_.empty()) {
+    LOG(INFO) << "ActionProcessor::ActionComplete: finished last action of"
+                 " type " << old_type;
+  } else if (code != ErrorCode::kSuccess) {
+    LOG(INFO) << "ActionProcessor::ActionComplete: " << old_type
+              << " action failed. Aborting processing.";
+    actions_.clear();
+  }
+  if (actions_.empty()) {
+    LOG(INFO) << "ActionProcessor::ActionComplete: finished last action of"
+                 " type " << old_type;
+    if (delegate_) {
+      delegate_->ProcessingDone(this, code);
+    }
+    return;
+  }
+  current_action_ = actions_.front();
+  actions_.pop_front();
+  LOG(INFO) << "ActionProcessor::ActionComplete: finished " << old_type
+            << ", starting " << current_action_->Type();
+  current_action_->PerformAction();
+}
+
+}  // namespace chromeos_update_engine