1 files changed, 100 insertions, 0 deletions
diff --git a/cmds/statsd/src/shell/ShellSubscriber.h b/cmds/statsd/src/shell/ShellSubscriber.h
new file mode 100644
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+++ b/cmds/statsd/src/shell/ShellSubscriber.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#pragma once
+
+#include "logd/LogEvent.h"
+
+#include <android/util/ProtoOutputStream.h>
+#include <binder/IResultReceiver.h>
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+#include "frameworks/base/cmds/statsd/src/shell/shell_config.pb.h"
+#include "frameworks/base/cmds/statsd/src/statsd_config.pb.h"
+#include "packages/UidMap.h"
+
+namespace android {
+namespace os {
+namespace statsd {
+
+/**
+ * Handles atoms subscription via shell cmd.
+ *
+ * A shell subscription lasts *until shell exits*. Unlike config based clients, a shell client
+ * communicates with statsd via file descriptors. They can subscribe pushed and pulled atoms.
+ * The atoms are sent back to the client in real time, as opposed to
+ * keeping the data in memory. Shell clients do not subscribe aggregated metrics, as they are
+ * responsible for doing the aggregation after receiving the atom events.
+ *
+ * Shell client pass ShellSubscription in the proto binary format. Client can update the
+ * subscription by sending a new subscription. The new subscription would replace the old one.
+ * Input data stream format is:
+ *
+ * |size_t|subscription proto|size_t|subscription proto|....
+ *
+ * statsd sends the events back in Atom proto binary format. Each Atom message is preceded
+ * with sizeof(size_t) bytes indicating the size of the proto message payload.
+ *
+ * The stream would be in the following format:
+ * |size_t|atom1 proto|size_t|atom2 proto|....
+ *
+ * Only one shell subscriber allowed at a time, because each shell subscriber blocks one thread
+ * until it exits.
+ */
+class ShellSubscriber : public virtual IBinder::DeathRecipient {
+public:
+    ShellSubscriber(sp<UidMap> uidMap) : mUidMap(uidMap){};
+
+    /**
+     * Start a new subscription.
+     */
+    void startNewSubscription(int inFd, int outFd, sp<IResultReceiver> resultReceiver);
+
+    void binderDied(const wp<IBinder>& who);
+
+    void onLogEvent(const LogEvent& event);
+
+private:
+    void readConfig(int in);
+
+    void updateConfig(const ShellSubscription& config);
+
+    void cleanUpLocked();
+
+    sp<UidMap> mUidMap;
+
+    // bool mWritten = false;
+
+    android::util::ProtoOutputStream mProto;
+
+    mutable std::mutex mMutex;
+
+    std::condition_variable mShellDied;  // semaphore for waiting until shell exits.
+
+    int mInput;  // The input file descriptor
+
+    int mOutput;  // The output file descriptor
+
+    sp<IResultReceiver> mResultReceiver;
+
+    std::vector<SimpleAtomMatcher> mPushedMatchers;
+};
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android