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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/DeprecatedString.h>
#include <AK/String.h>
#include <LibSQL/SQLClient.h>
#if !defined(AK_OS_SERENITY)
# include <LibCore/Directory.h>
# include <LibCore/File.h>
# include <LibCore/SocketAddress.h>
# include <LibCore/StandardPaths.h>
# include <LibCore/Stream.h>
# include <LibCore/System.h>
#endif
namespace SQL {
#if !defined(AK_OS_SERENITY)
// This is heavily based on how SystemServer's Service creates its socket.
static ErrorOr<int> create_database_socket(DeprecatedString const& socket_path)
{
if (Core::File::exists(socket_path))
TRY(Core::System::unlink(socket_path));
# ifdef SOCK_NONBLOCK
auto socket_fd = TRY(Core::System::socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0));
# else
auto socket_fd = TRY(Core::System::socket(AF_LOCAL, SOCK_STREAM, 0));
int option = 1;
TRY(Core::System::ioctl(socket_fd, FIONBIO, &option));
TRY(Core::System::fcntl(socket_fd, F_SETFD, FD_CLOEXEC));
# endif
# if !defined(AK_OS_MACOS) && !defined(AK_OS_FREEBSD) && !defined(AK_OS_OPENBSD)
TRY(Core::System::fchmod(socket_fd, 0600));
# endif
auto socket_address = Core::SocketAddress::local(socket_path);
auto socket_address_un = socket_address.to_sockaddr_un().release_value();
TRY(Core::System::bind(socket_fd, reinterpret_cast<sockaddr*>(&socket_address_un), sizeof(socket_address_un)));
TRY(Core::System::listen(socket_fd, 16));
return socket_fd;
}
static ErrorOr<void> launch_server(DeprecatedString const& socket_path, DeprecatedString const& pid_path, Vector<String> candidate_server_paths)
{
auto server_fd_or_error = create_database_socket(socket_path);
if (server_fd_or_error.is_error()) {
warnln("Failed to create a database socket at {}: {}", socket_path, server_fd_or_error.error());
return server_fd_or_error.release_error();
}
auto server_fd = server_fd_or_error.value();
auto server_pid = TRY(Core::System::fork());
if (server_pid == 0) {
TRY(Core::System::setsid());
TRY(Core::System::signal(SIGCHLD, SIG_IGN));
server_pid = TRY(Core::System::fork());
if (server_pid != 0) {
auto server_pid_file = TRY(Core::Stream::File::open(pid_path, Core::Stream::OpenMode::Write));
TRY(server_pid_file->write(DeprecatedString::number(server_pid).bytes()));
TRY(Core::System::kill(getpid(), SIGTERM));
}
server_fd = TRY(Core::System::dup(server_fd));
auto takeover_string = DeprecatedString::formatted("SQLServer:{}", server_fd);
TRY(Core::System::setenv("SOCKET_TAKEOVER"sv, takeover_string, true));
ErrorOr<void> result;
for (auto const& server_path : candidate_server_paths) {
auto arguments = Array {
server_path.bytes_as_string_view(),
"--pid-file"sv,
pid_path,
};
result = Core::System::exec(arguments[0], arguments, Core::System::SearchInPath::Yes);
if (!result.is_error())
break;
}
if (result.is_error()) {
warnln("Could not launch any of {}: {}", candidate_server_paths, result.error());
TRY(Core::System::unlink(pid_path));
}
VERIFY_NOT_REACHED();
}
TRY(Core::System::waitpid(server_pid));
return {};
}
static ErrorOr<bool> should_launch_server(DeprecatedString const& pid_path)
{
if (!Core::File::exists(pid_path))
return true;
Optional<pid_t> pid;
{
auto server_pid_file = Core::Stream::File::open(pid_path, Core::Stream::OpenMode::Read);
if (server_pid_file.is_error()) {
warnln("Could not open SQLServer PID file '{}': {}", pid_path, server_pid_file.error());
return server_pid_file.release_error();
}
auto contents = server_pid_file.value()->read_until_eof();
if (contents.is_error()) {
warnln("Could not read SQLServer PID file '{}': {}", pid_path, contents.error());
return contents.release_error();
}
pid = StringView { contents.value() }.to_int<pid_t>();
}
if (!pid.has_value()) {
warnln("SQLServer PID file '{}' exists, but with an invalid PID", pid_path);
TRY(Core::System::unlink(pid_path));
return true;
}
if (kill(*pid, 0) < 0) {
warnln("SQLServer PID file '{}' exists with PID {}, but process cannot be found", pid_path, *pid);
TRY(Core::System::unlink(pid_path));
return true;
}
return false;
}
ErrorOr<NonnullRefPtr<SQLClient>> SQLClient::launch_server_and_create_client(Vector<String> candidate_server_paths)
{
auto runtime_directory = TRY(Core::StandardPaths::runtime_directory());
auto socket_path = DeprecatedString::formatted("{}/SQLServer.socket", runtime_directory);
auto pid_path = DeprecatedString::formatted("{}/SQLServer.pid", runtime_directory);
if (TRY(should_launch_server(pid_path)))
TRY(launch_server(socket_path, pid_path, move(candidate_server_paths)));
auto socket = TRY(Core::Stream::LocalSocket::connect(move(socket_path)));
TRY(socket->set_blocking(true));
return adopt_nonnull_ref_or_enomem(new (nothrow) SQLClient(move(socket)));
}
#endif
void SQLClient::execution_success(u64 statement_id, u64 execution_id, Vector<DeprecatedString> const& column_names, bool has_results, size_t created, size_t updated, size_t deleted)
{
if (!on_execution_success) {
outln("{} row(s) created, {} updated, {} deleted", created, updated, deleted);
return;
}
ExecutionSuccess success {
.statement_id = statement_id,
.execution_id = execution_id,
.column_names = move(const_cast<Vector<DeprecatedString>&>(column_names)),
.has_results = has_results,
.rows_created = created,
.rows_updated = updated,
.rows_deleted = deleted,
};
on_execution_success(move(success));
}
void SQLClient::execution_error(u64 statement_id, u64 execution_id, SQLErrorCode const& code, DeprecatedString const& message)
{
if (!on_execution_error) {
warnln("Execution error for statement_id {}: {} ({})", statement_id, message, to_underlying(code));
return;
}
ExecutionError error {
.statement_id = statement_id,
.execution_id = execution_id,
.error_code = code,
.error_message = move(const_cast<DeprecatedString&>(message)),
};
on_execution_error(move(error));
}
void SQLClient::next_result(u64 statement_id, u64 execution_id, Vector<Value> const& row)
{
if (!on_next_result) {
StringBuilder builder;
builder.join(", "sv, row, "\"{}\""sv);
outln("{}", builder.string_view());
return;
}
ExecutionResult result {
.statement_id = statement_id,
.execution_id = execution_id,
.values = move(const_cast<Vector<Value>&>(row)),
};
on_next_result(move(result));
}
void SQLClient::results_exhausted(u64 statement_id, u64 execution_id, size_t total_rows)
{
if (!on_results_exhausted) {
outln("{} total row(s)", total_rows);
return;
}
ExecutionComplete success {
.statement_id = statement_id,
.execution_id = execution_id,
.total_rows = total_rows,
};
on_results_exhausted(move(success));
}
}
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