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LibSQL+SQLServer: Build SQLServer system service

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This patch introduces the SQLServer system server. This service is
supposed to be the only process/application talking to database storage.
This makes things like locking and caching more reliable, easier to
implement, and more efficient.

In LibSQL we added a client component that does the ugly IPC nitty-
gritty for you. All that's needed is setting a number of event handler
lambdas and you can connect to databases and execute statements on them.

Applications that wish to use this SQLClient class obviously need to
link LibSQL and LibIPC.
This commit is contained in:
Jan de Visser 2021-06-28 21:15:17 -04:00 • committed by Ali Mohammad Pur
parent 1037d6b0eb
commit a034774e3a
19 changed files with 650 additions and 12 deletions
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83
Userland/Services/SQLServer/DatabaseConnection.cpp Normal file
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/*
* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/LexicalPath.h>
#include <SQLServer/ClientConnection.h>
#include <SQLServer/DatabaseConnection.h>
#include <SQLServer/SQLStatement.h>
namespace SQLServer {
static HashMap<int, NonnullRefPtr<DatabaseConnection>> s_connections;
RefPtr<DatabaseConnection> DatabaseConnection::connection_for(int connection_id)
{
if (s_connections.contains(connection_id))
return *s_connections.get(connection_id).value();
dbgln_if(SQLSERVER_DEBUG, "Invalid connection_id {}", connection_id);
return nullptr;
}
static int s_next_connection_id = 0;
DatabaseConnection::DatabaseConnection(String database_name, int client_id)
: Object()
, m_database_name(move(database_name))
, m_connection_id(s_next_connection_id++)
, m_client_id(client_id)
{
LexicalPath path(database_name);
if (path.title() != database_name) {
auto client_connection = ClientConnection::client_connection_for(m_client_id);
client_connection->async_connection_error(m_connection_id, (int)SQL::SQLErrorCode::InvalidDatabaseName, m_database_name);
return;
}
dbgln_if(SQLSERVER_DEBUG, "DatabaseConnection {} initiating connection with database '{}'", connection_id(), m_database_name);
s_connections.set(m_connection_id, *this);
deferred_invoke([&](Object&) {
m_database = SQL::Database::construct(String::formatted("/home/anon/sql/{}.db", m_database_name));
m_accept_statements = true;
auto client_connection = ClientConnection::client_connection_for(client_id);
if (client_connection)
client_connection->async_connected(m_connection_id);
else
warnln("Cannot notify client of database connection. Client disconnected");
});
}
void DatabaseConnection::disconnect()
{
dbgln_if(SQLSERVER_DEBUG, "DatabaseConnection::disconnect(connection_id {}, database '{}'", connection_id(), m_database_name);
m_accept_statements = false;
deferred_invoke([&](Object&) {
m_database = nullptr;
s_connections.remove(m_connection_id);
auto client_connection = ClientConnection::client_connection_for(client_id());
if (client_connection)
client_connection->async_disconnected(m_connection_id);
else
warnln("Cannot notify client of database disconnection. Client disconnected");
});
}
int DatabaseConnection::sql_statement(String const& sql)
{
dbgln_if(SQLSERVER_DEBUG, "DatabaseConnection::sql_statement(connection_id {}, database '{}', sql '{}'", connection_id(), m_database_name, sql);
auto client_connection = ClientConnection::client_connection_for(client_id());
if (!client_connection) {
warnln("Cannot notify client of database disconnection. Client disconnected");
return -1;
}
if (!m_accept_statements) {
client_connection->async_execution_error(-1, (int)SQL::SQLErrorCode::DatabaseUnavailable, m_database_name);
return -1;
}
auto statement = SQLStatement::construct(*this, sql);
return statement->statement_id();
}
}