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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/public/resource_attribution/frame_context.h"
#include <optional>
#include <sstream>
#include <utility>
#include "base/check.h"
#include "base/memory/weak_ptr.h"
#include "components/performance_manager/graph/frame_node_impl.h"
#include "components/performance_manager/graph/process_node_impl.h"
#include "components/performance_manager/public/graph/frame_node.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/performance_manager.h"
#include "components/performance_manager/public/render_process_host_id.h"
#include "components/performance_manager/resource_attribution/performance_manager_aliases.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/global_routing_id.h"
#include "content/public/browser/render_frame_host.h"
namespace resource_attribution {
namespace {
bool IsValidId(content::GlobalRenderFrameHostId id) {
return !RenderProcessHostId(id.child_id).is_null() &&
id.frame_routing_id != MSG_ROUTING_NONE;
}
} // namespace
FrameContext::FrameContext(content::GlobalRenderFrameHostId id,
base::WeakPtr<FrameNode> weak_node)
: id_(id), weak_node_(weak_node) {}
FrameContext::~FrameContext() = default;
FrameContext::FrameContext(const FrameContext& other) = default;
FrameContext& FrameContext::operator=(const FrameContext& other) = default;
FrameContext::FrameContext(FrameContext&& other) = default;
FrameContext& FrameContext::operator=(FrameContext&& other) = default;
// static
std::optional<FrameContext> FrameContext::FromRenderFrameHost(
content::RenderFrameHost* host) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
CHECK(host);
CHECK(IsValidId(host->GetGlobalId()));
base::WeakPtr<FrameNode> frame_node =
PerformanceManager::GetFrameNodeForRenderFrameHost(host);
if (!frame_node.MaybeValid()) {
// GetFrameNodeForRenderFrameHost returns an explicit null WeakPtr if
// PerformanceManager is not started or `host` has no FrameNode yet. In this
// case MaybeValid() is guaranteed false and this should return nullopt.
//
// Otherwise this should return a FrameContext containing a WeakPtr, which
// will become invalid once the FrameNode dies. FrameNode outlives the
// RenderFrameHost, and the caller had a valid RenderFrameHost on the UI
// thread, so the WeakPtr is guaranteed to be valid at this point. Therefore
// MaybeValid() can only be false in the first case.
return std::nullopt;
}
return FrameContext(host->GetGlobalId(), std::move(frame_node));
}
content::RenderFrameHost* FrameContext::GetRenderFrameHost() const {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
return content::RenderFrameHost::FromID(id_);
}
content::GlobalRenderFrameHostId FrameContext::GetRenderFrameHostId() const {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
return id_;
}
base::WeakPtr<FrameNode> FrameContext::GetWeakFrameNode() const {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
return weak_node_;
}
// static
FrameContext FrameContext::FromFrameNode(const FrameNode* node) {
CHECK(node);
DCHECK_ON_GRAPH_SEQUENCE(node->GetGraph());
auto* node_impl = FrameNodeImpl::FromNode(node);
CHECK(node_impl->process_node());
content::GlobalRenderFrameHostId global_id(
node_impl->process_node()->GetRenderProcessHostId().GetUnsafeValue(),
node_impl->render_frame_id());
CHECK(IsValidId(global_id));
return FrameContext(global_id, node_impl->GetWeakPtr());
}
// static
std::optional<FrameContext> FrameContext::FromWeakFrameNode(
base::WeakPtr<FrameNode> node) {
if (!node) {
return std::nullopt;
}
return FromFrameNode(node.get());
}
FrameNode* FrameContext::GetFrameNode() const {
if (weak_node_) {
// `weak_node` will check anyway if dereferenced from the wrong sequence,
// but let's be explicit.
DCHECK_ON_GRAPH_SEQUENCE(weak_node_->GetGraph());
return weak_node_.get();
}
return nullptr;
}
std::string FrameContext::ToString() const {
// Using stringstream instead of StrCat because `id_` has a streaming
// operator.
std::stringstream s;
s << "FrameContext:" << id_;
return s.str();
}
} // namespace resource_attribution
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