chromium/third_party/perfetto/src/trace_processor/rpc/rpc.h

/*
 * Copyright (C) 2019 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.
 */

#ifndef SRC_TRACE_PROCESSOR_RPC_RPC_H_
#define SRC_TRACE_PROCESSOR_RPC_RPC_H_

#include <cstddef>
#include <cstdint>
#include <functional>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "perfetto/base/status.h"
#include "perfetto/ext/protozero/proto_ring_buffer.h"
#include "perfetto/protozero/field.h"
#include "perfetto/trace_processor/basic_types.h"

namespace perfetto {

namespace protos::pbzero {
class ComputeMetricResult;
class DisableAndReadMetatraceResult;
}  // namespace protos::pbzero

namespace trace_processor {

class Iterator;
class TraceProcessor;

// This class handles the binary {,un}marshalling for the Trace Processor RPC
// API (see protos/perfetto/trace_processor/trace_processor.proto).
// This is to deal with cases where the client of the trace processor is not
// some in-process C++ code but a remote process:
// There are two use cases of this:
//   1. The JS<>WASM interop for the web-based UI.
//   2. The HTTP RPC mode of trace_processor_shell that allows the UI to talk
//      to a native trace processor instead of the bundled WASM one.
// This class has (a subset of) the same methods of the public TraceProcessor
// interface, but the methods just take and return proto-encoded binary buffers.
// This class does NOT define how the transport works (e.g. HTTP vs WASM interop
// calls), it just deals with {,un}marshalling.
// This class internally creates and owns a TraceProcessor instance, which
// lifetime is tied to the lifetime of the Rpc instance.
class Rpc { … };

}  // namespace trace_processor
}  // namespace perfetto

#endif  // SRC_TRACE_PROCESSOR_RPC_RPC_H_