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LibCore+Everywhere: Make Core::Stream::read() return Bytes

Browse source 
A mistake I've repeatedly made is along these lines:
```c++
auto nread = TRY(source_file->read(buffer));
TRY(destination_file->write(buffer));
```

It's a little clunky to have to create a Bytes or StringView from the
buffer's data pointer and the nread, and easy to forget and just use
the buffer. So, this patch changes the read() function to return a
Bytes of the data that were just read.

The other read_foo() methods will be modified in the same way in
subsequent commits.

Fixes #13687
This commit is contained in:
Sam Atkins 2022-04-15 13:33:02 +01:00 • committed by Tim Flynn
parent 6654efcd82
commit 3b1e063d30
22 changed files with 103 additions and 103 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Userland/Services/EchoServer/Client.cpp
View file

@ -30,16 +30,16 @@ ErrorOr<void> Client::drain_socket()
auto buffer = TRY(ByteBuffer::create_uninitialized(1024));
while (TRY(m_socket->can_read_without_blocking())) {
auto nread = TRY(m_socket->read(buffer));
auto bytes_read = TRY(m_socket->read(buffer));
dbgln("Read {} bytes.", nread);
dbgln("Read {} bytes.", bytes_read.size());
if (m_socket->is_eof()) {
Core::deferred_invoke([this, strong_this = NonnullRefPtr(*this)] { quit(); });
break;
}
TRY(m_socket->write({ buffer.data(), nread }));
TRY(m_socket->write(bytes_read));
}
return {};

8
Userland/Services/FileOperation/main.cpp
View file

@ -238,15 +238,15 @@ ErrorOr<int> execute_work_items(Vector<WorkItem> const& items)
while (true) {
print_progress();
auto bytes_read = TRY(source_file->read(buffer.bytes()));
if (bytes_read == 0)
if (bytes_read.is_empty())
break;
if (auto result = destination_file->write(buffer); result.is_error()) {
if (auto result = destination_file->write(bytes_read); result.is_error()) {
// FIXME: Return the formatted string directly. There is no way to do this right now without the temporary going out of scope and being destroyed.
report_warning(String::formatted("Failed to write to destination file: {}", result.error()));
return result.error();
}
item_done += bytes_read;
executed_work_bytes += bytes_read;
item_done += bytes_read.size();
executed_work_bytes += bytes_read.size();
print_progress();
// FIXME: Remove this once the kernel is smart enough to schedule other threads
// while we're doing heavy I/O. Right now, copying a large file will totally

16
Userland/Services/InspectorServer/InspectableProcess.cpp
View file

@ -43,8 +43,8 @@ String InspectableProcess::wait_for_response()
}
u32 length {};
auto nread = m_socket->read({ (u8*)&length, sizeof(length) }).release_value_but_fixme_should_propagate_errors();
if (nread != sizeof(length)) {
auto length_bytes_read = m_socket->read({ (u8*)&length, sizeof(length) }).release_value_but_fixme_should_propagate_errors();
if (length_bytes_read.size() != sizeof(length)) {
dbgln("InspectableProcess got malformed data: PID {}", m_pid);
m_socket->close();
return {};
@ -54,17 +54,17 @@ String InspectableProcess::wait_for_response()
auto remaining_data_buffer = data_buffer.bytes();
while (!remaining_data_buffer.is_empty()) {
auto maybe_nread = m_socket->read(remaining_data_buffer);
if (maybe_nread.is_error()) {
dbgln("InspectableProcess::wait_for_response: Failed to read data: {}", maybe_nread.error());
auto maybe_bytes_read = m_socket->read(remaining_data_buffer);
if (maybe_bytes_read.is_error()) {
dbgln("InspectableProcess::wait_for_response: Failed to read data: {}", maybe_bytes_read.error());
break;
}
auto nread = maybe_nread.release_value();
if (nread == 0)
auto bytes_read = maybe_bytes_read.release_value();
if (bytes_read.is_empty())
break;
remaining_data_buffer = remaining_data_buffer.slice(nread);
remaining_data_buffer = remaining_data_buffer.slice(bytes_read.size());
}
VERIFY(data_buffer.size() == length);

2
Userland/Services/LookupServer/LookupServer.cpp
View file

@ -239,7 +239,7 @@ ErrorOr<Vector<Answer>> LookupServer::lookup(Name const& name, String const& nam
TRY(udp_socket->write(buffer));
u8 response_buffer[4096];
int nrecv = TRY(udp_socket->read({ response_buffer, sizeof(response_buffer) }));
int nrecv = TRY(udp_socket->read({ response_buffer, sizeof(response_buffer) })).size();
if (udp_socket->is_eof())
return Vector<Answer> {};

4
Userland/Services/TelnetServer/Client.cpp
View file

@ -76,9 +76,9 @@ ErrorOr<void> Client::drain_socket()
auto buffer = TRY(ByteBuffer::create_uninitialized(1024));
while (TRY(m_socket->can_read_without_blocking())) {
auto nread = TRY(m_socket->read(buffer));
auto read_bytes = TRY(m_socket->read(buffer));
m_parser.write({ buffer.data(), nread });
m_parser.write(StringView { read_bytes });
if (m_socket->is_eof()) {
Core::deferred_invoke([this, strong_this = NonnullRefPtr(*this)] { quit(); });