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e1ed8722e0
This is just to help make the message handlers a bit briefer. I had considered adding a TRY-like macro to auto-return when the lookup fails, but since statement expressions cannot return references, that would result in a copy of all e.g. object and array lookups.
109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
/*
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* Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibDevTools/Actor.h>
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#include <LibDevTools/Connection.h>
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#include <LibDevTools/DevToolsServer.h>
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namespace DevTools {
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Actor::Actor(DevToolsServer& devtools, String name)
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: m_devtools(devtools)
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, m_name(move(name))
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{
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}
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Actor::~Actor() = default;
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void Actor::send_message(JsonObject message, Optional<BlockToken> block_token)
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{
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if (m_block_responses && !block_token.has_value()) {
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m_blocked_responses.append(move(message));
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return;
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}
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message.set("from"sv, name());
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if (auto& connection = devtools().connection())
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connection->send_message(move(message));
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}
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// https://firefox-source-docs.mozilla.org/devtools/backend/protocol.html#error-packets
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void Actor::send_missing_parameter_error(StringView parameter)
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{
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JsonObject error;
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error.set("error"sv, "missingParameter"sv);
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error.set("message"sv, MUST(String::formatted("Missing parameter: '{}'", parameter)));
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send_message(move(error));
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}
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// https://firefox-source-docs.mozilla.org/devtools/backend/protocol.html#error-packets
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void Actor::send_unrecognized_packet_type_error(StringView type)
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{
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JsonObject error;
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error.set("error"sv, "unrecognizedPacketType"sv);
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error.set("message"sv, MUST(String::formatted("Unrecognized packet type: '{}'", type)));
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send_message(move(error));
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}
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// https://github.com/mozilla/gecko-dev/blob/master/devtools/server/actors/object.js
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// This error is not documented, but is used by Firefox nonetheless.
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void Actor::send_unknown_actor_error(StringView actor)
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{
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JsonObject error;
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error.set("error"sv, "unknownActor"sv);
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error.set("message"sv, MUST(String::formatted("Unknown actor: '{}'", actor)));
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send_message(move(error));
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}
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Actor::BlockToken Actor::block_responses()
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{
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// https://firefox-source-docs.mozilla.org/devtools/backend/protocol.html#the-request-reply-pattern
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// The actor processes packets in the order they are received, and the client can trust that the i’th reply
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// corresponds to the i’th request.
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// The above requirement gets tricky for actors which require an async implementation. For example, the "getWalker"
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// message sent to the InspectorActor results in the server fetching the DOM tree as JSON from the WebContent process.
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// We cannot reply to the message until that is received. However, we will likely receive more messages from the
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// client in that time. We cannot reply to those messages until we've replied to the "getWalker" message. Thus, we
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// use this token to queue responses from the actor until that reply can be sent.
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return { {}, *this };
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}
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Actor::BlockToken::BlockToken(Badge<Actor>, Actor& actor)
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: m_actor(actor)
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{
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// If we end up in a situtation where an actor has multiple async handlers at once, we will need to come up with a
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// more sophisticated blocking mechanism.
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VERIFY(!actor.m_block_responses);
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actor.m_block_responses = true;
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}
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Actor::BlockToken::BlockToken(BlockToken&& other)
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: m_actor(move(other.m_actor))
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{
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}
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Actor::BlockToken& Actor::BlockToken::operator=(BlockToken&& other)
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{
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m_actor = move(other.m_actor);
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return *this;
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}
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Actor::BlockToken::~BlockToken()
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{
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auto actor = m_actor.strong_ref();
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if (!actor)
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return;
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auto blocked_responses = move(actor->m_blocked_responses);
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actor->m_block_responses = false;
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for (auto& message : blocked_responses)
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actor->send_message(move(message));
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}
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}
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