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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Copyright (c) 2020 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#ifndef CEF_LIBCEF_BROWSER_DEVTOOLS_DEVTOOLS_UTIL_H_
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#define CEF_LIBCEF_BROWSER_DEVTOOLS_DEVTOOLS_UTIL_H_
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#pragma once
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#include <string_view>
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namespace devtools_util {
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// Fast parser for DevTools JSON protocol messages. This implementation makes
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// certain assumptions about the JSON object structure (value order and
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// formatting) to avoid stateful parsing of messages that may be large
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// (sometimes > 1MB in size). The message must be a JSON dictionary that starts
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// with a "method" or "id" value which is non-empty and of the expected data
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// type. Messages that have a "method" value (event message) may optionally have
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// a "params" dictionary. Messages that have an "id" value (result message) must
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// have a "result" or "error" dictionary. The dictionary contents are not
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// validated and may be empty ("{}").
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//
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// Example event message:
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// {"method":"Target.targetDestroyed","params":{"targetId":"1234..."}}
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//
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// Example result messages:
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// {"id":3,"result":{}}
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// {"id":4,"result":{"debuggerId":"-2193881606781505058.81393575456727957"}}
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// {"id":5,"error":{"code":-32000,"message":"Not supported"}}
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struct ProtocolParser {
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ProtocolParser() = default;
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// Checks for a non-empty JSON dictionary.
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static bool IsValidMessage(const std::string_view& message);
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// Returns false if already initialized.
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bool Initialize(const std::string_view& message);
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bool IsInitialized() const { return status_ != UNINITIALIZED; }
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bool IsEvent() const { return status_ == EVENT; }
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bool IsResult() const { return status_ == RESULT; }
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bool IsFailure() const { return status_ == FAILURE; }
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void Reset() { status_ = UNINITIALIZED; }
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// For event messages:
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// "method" string:
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std::string_view method_;
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// For result messages:
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// "id" int:
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int message_id_ = 0;
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// true if "result" value, false if "error" value:
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bool success_ = false;
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// For both:
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// "params", "result" or "error" dictionary:
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std::string_view params_;
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private:
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enum Status {
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UNINITIALIZED,
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EVENT, // Event message.
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RESULT, // Result message.
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FAILURE, // Parsing failure.
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};
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Status status_ = UNINITIALIZED;
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};
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} // namespace devtools_util
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#endif // CEF_LIBCEF_BROWSER_DEVTOOLS_DEVTOOLS_UTIL_H_
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