Browser: Store cookies in a LibSQL database :^)

Currently, cookies are ephemeral and only survive for the lifetime of
Browser instance. This will make Browser instead store cookies in a SQL
database for persisted access.

Userland/Applications/Browser/Database.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "Database.h"
+#include <AK/Format.h>
+#include <AK/StringView.h>
+
+namespace Browser {
+
+static constexpr auto database_name = "Browser"sv;
+
+ErrorOr<NonnullRefPtr<Database>> Database::create()
+{
+    auto sql_client = TRY(SQL::SQLClient::try_create());
+    return create(move(sql_client));
+}
+
+ErrorOr<NonnullRefPtr<Database>> Database::create(NonnullRefPtr<SQL::SQLClient> sql_client)
+{
+    auto connection_id = sql_client->connect(database_name);
+    if (!connection_id.has_value())
+        return Error::from_string_view("Could not connect to SQL database"sv);
+
+    return adopt_nonnull_ref_or_enomem(new (nothrow) Database(move(sql_client), *connection_id));
+}
+
+Database::Database(NonnullRefPtr<SQL::SQLClient> sql_client, SQL::ConnectionID connection_id)
+    : m_sql_client(move(sql_client))
+    , m_connection_id(connection_id)
+{
+    m_sql_client->on_execution_success = [this](auto statement_id, auto execution_id, auto has_results, auto, auto, auto) {
+        if (has_results)
+            return;
+
+        if (auto it = m_pending_executions.find({ statement_id, execution_id }); it != m_pending_executions.end()) {
+            auto in_progress_statement = move(it->value);
+            m_pending_executions.remove(it);
+
+            if (in_progress_statement.on_complete)
+                in_progress_statement.on_complete();
+        }
+    };
+
+    m_sql_client->on_next_result = [this](auto statement_id, auto execution_id, auto row) {
+        if (auto it = m_pending_executions.find({ statement_id, execution_id }); it != m_pending_executions.end()) {
+            if (it->value.on_result)
+                it->value.on_result(row);
+        }
+    };
+
+    m_sql_client->on_results_exhausted = [this](auto statement_id, auto execution_id, auto) {
+        if (auto it = m_pending_executions.find({ statement_id, execution_id }); it != m_pending_executions.end()) {
+            auto in_progress_statement = move(it->value);
+            m_pending_executions.remove(it);
+
+            if (in_progress_statement.on_complete)
+                in_progress_statement.on_complete();
+        }
+    };
+
+    m_sql_client->on_execution_error = [this](auto statement_id, auto execution_id, auto, auto const& message) {
+        if (auto it = m_pending_executions.find({ statement_id, execution_id }); it != m_pending_executions.end()) {
+            auto in_progress_statement = move(it->value);
+            m_pending_executions.remove(it);
+
+            if (in_progress_statement.on_error)
+                in_progress_statement.on_error(message);
+        }
+    };
+}
+
+ErrorOr<SQL::StatementID> Database::prepare_statement(StringView statement)
+{
+    if (auto statement_id = m_sql_client->prepare_statement(m_connection_id, statement); statement_id.has_value())
+        return *statement_id;
+    return Error::from_string_view(statement);
+}
+
+void Database::execute_statement(SQL::StatementID statement_id, Vector<SQL::Value> placeholder_values, PendingExecution pending_execution)
+{
+    Core::deferred_invoke([this, statement_id, placeholder_values = move(placeholder_values), pending_execution = move(pending_execution)]() mutable {
+        auto execution_id = m_sql_client->execute_statement(statement_id, move(placeholder_values));
+        if (!execution_id.has_value()) {
+            if (pending_execution.on_error)
+                pending_execution.on_error("Could not execute statement"sv);
+            return;
+        }
+
+        m_pending_executions.set({ statement_id, *execution_id }, move(pending_execution));
+    });
+}
+
+}