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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/network/devtools_durable_msg.h"
#include "base/functional/callback_helpers.h"
#include "mojo/public/cpp/base/big_buffer.h"
#include "net/base/io_buffer.h"
#include "net/filter/filter_source_stream.h"
#include "net/filter/source_stream.h"
#include "net/filter/source_stream_type.h"
namespace network {
class DurableMessageEncodedSourceStream : public net::SourceStream {
public:
explicit DurableMessageEncodedSourceStream(
base::span<const uint8_t> encoded_bytes)
: SourceStream(net::SourceStreamType::kNone),
encoded_bytes_(encoded_bytes) {}
int Read(net::IOBuffer* dest_buffer,
int buffer_size,
net::CompletionOnceCallback callback) override {
size_t consume = std::min(base::checked_cast<size_t>(buffer_size),
encoded_bytes_.size());
if (consume == 0) {
return 0;
}
dest_buffer->span().copy_prefix_from(encoded_bytes_.take_first(consume));
return base::checked_cast<int>(consume);
}
std::string Description() const override {
return "DurableMessageEncodedSourceStream";
}
bool MayHaveMoreBytes() const override { return !encoded_bytes_.empty(); }
private:
base::raw_span<const uint8_t> encoded_bytes_;
};
DevtoolsDurableMessage::DevtoolsDurableMessage(
std::string request_id,
DevtoolsDurableMessageAccountingDelegate& accounting_delegate)
: request_id_(std::move(request_id)),
accounting_delegate_(accounting_delegate) {}
DevtoolsDurableMessage::~DevtoolsDurableMessage() {
accounting_delegate_->WillRemoveBytes(*this);
}
void DevtoolsDurableMessage::AddBytes(base::span<const uint8_t> bytes,
size_t encoded_byte_size) {
CHECK(!is_complete_);
base::WeakPtr<DevtoolsDurableMessage> self = GetWeakPtr();
accounting_delegate_->WillAddBytes(*this, encoded_byte_size);
if (!self) {
return;
}
bytes_.insert(bytes_.end(), bytes.begin(), bytes.end());
encoded_byte_size_ += encoded_byte_size;
}
mojo_base::BigBuffer DevtoolsDurableMessage::Retrieve() const {
CHECK(is_complete_);
if (client_decoding_types_.empty()) {
return mojo_base::BigBuffer(bytes_);
}
// Stored data needs to be decoded before shipping out.
std::unique_ptr<DurableMessageEncodedSourceStream> encoded_stream =
std::make_unique<DurableMessageEncodedSourceStream>(bytes_);
std::unique_ptr<net::SourceStream> decoding_stream =
net::FilterSourceStream::CreateDecodingSourceStream(
std::move(encoded_stream), client_decoding_types_);
scoped_refptr<net::GrowableIOBuffer> decode_buffer =
base::MakeRefCounted<net::GrowableIOBuffer>();
// Set to encoded size initially.
decode_buffer->SetCapacity(encoded_byte_size_);
while (decoding_stream->MayHaveMoreBytes()) {
if (decode_buffer->RemainingCapacity() == 0) {
decode_buffer->SetCapacity(decode_buffer->capacity() * 2);
}
int result = decoding_stream->Read(decode_buffer.get(),
decode_buffer->RemainingCapacity(),
base::DoNothing());
if (result > 0) {
// Update the offset of the `decode_buffer` to reflect the new data.
decode_buffer->DidConsume(result);
} else {
// If someone makes a FilterSourceStream that decompresses asynchronously
// (on another thread, for example), then crash noisily.
CHECK_NE(result, net::ERR_IO_PENDING);
}
}
return mojo_base::BigBuffer(decode_buffer->span_before_offset());
}
void DevtoolsDurableMessage::MarkComplete() {
is_complete_ = true;
}
} // namespace network
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