1 files changed, 380 insertions, 0 deletions
diff --git a/modules/extra/sqlite.cpp b/modules/extra/sqlite.cpp
new file mode 100644
index 000000000..9370a0d77
--- /dev/null
+++ b/modules/extra/sqlite.cpp
@@ -0,0 +1,380 @@
+/* RequiredLibraries: sqlite3 */
+/* RequiredWindowsLibraries: sqlite3 */
+
+#include "module.h"
+#include "modules/sql.h"
+#include <sqlite3.h>
+
+using namespace SQL;
+
+/* SQLite3 API, based from InspiRCd */
+
+/** A SQLite result
+ */
+class SQLiteResult : public Result
+{
+ public:
+	SQLiteResult(sqlite3 *sql, unsigned int id, const Query &q, const Anope::string &fq, sqlite3_stmt *stmt) : Result(id, q, fq)
+	{
+		int cols = sqlite3_column_count(stmt);
+		for (int i = 0; i < cols; ++i)
+			this->columns.push_back(sqlite3_column_name(stmt, i));
+
+		int err;
+		while ((err = sqlite3_step(stmt)) == SQLITE_ROW)
+		{
+			std::vector<SQL::Result::Value> values;
+
+			for (int i = 0; i < cols; ++i)
+			{
+				const char *data = reinterpret_cast<const char *>(sqlite3_column_text(stmt, i));
+
+				Value v;
+				v.null = !data;
+				v.value = data ? data : "";
+				values.push_back(v);
+			}
+
+			this->values.push_back(values);
+		}
+
+		if (err != SQLITE_DONE)
+		{
+			error = sqlite3_errmsg(sql);
+		}
+	}
+
+	SQLiteResult(const Query &q, const Anope::string &fq, const Anope::string &err) : Result(0, q, fq, err)
+	{
+	}
+};
+
+/** A SQLite database, there can be multiple
+ */
+class SQLiteService : public Provider
+{
+	std::map<Anope::string, std::set<Anope::string> > active_schema, indexes;
+
+	Anope::string database;
+
+	sqlite3 *sql;
+
+	Anope::string Escape(const Anope::string &query);
+
+ public:
+	SQLiteService(Module *o, const Anope::string &n, const Anope::string &d);
+
+	~SQLiteService();
+
+	void Run(Interface *i, const Query &query) override;
+
+	Result RunQuery(const Query &query);
+
+	std::vector<Query> InitSchema(const Anope::string &prefix) override;
+	std::vector<Query> Replace(const Anope::string &table, const Query &, const std::set<Anope::string> &) override;
+	std::vector<Query> CreateTable(const Anope::string &, const Anope::string &table) override;
+	std::vector<Query> AlterTable(const Anope::string &, const Anope::string &table, const Anope::string &field, bool) override;
+	std::vector<Query> CreateIndex(const Anope::string &table, const Anope::string &field) override;
+
+	Query BeginTransaction() override;
+	Query Commit() override;
+
+	Serialize::ID GetID(const Anope::string &) override;
+
+	Query GetTables(const Anope::string &prefix);
+
+	Anope::string BuildQuery(const Query &q);
+};
+
+class ModuleSQLite : public Module
+{
+	/* SQL connections */
+	std::map<Anope::string, SQLiteService *> SQLiteServices;
+
+ public:
+	ModuleSQLite(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, EXTRA | VENDOR)
+	{
+	}
+
+	~ModuleSQLite()
+	{
+		for (std::map<Anope::string, SQLiteService *>::iterator it = this->SQLiteServices.begin(); it != this->SQLiteServices.end(); ++it)
+			delete it->second;
+		SQLiteServices.clear();
+	}
+
+	void OnReload(Configuration::Conf *conf) override
+	{
+		Configuration::Block *config = conf->GetModule(this);
+
+		for (std::map<Anope::string, SQLiteService *>::iterator it = this->SQLiteServices.begin(); it != this->SQLiteServices.end();)
+		{
+			const Anope::string &cname = it->first;
+			SQLiteService *s = it->second;
+			int i, num;
+			++it;
+
+			for (i = 0, num = config->CountBlock("sqlite"); i < num; ++i)
+				if (config->GetBlock("sqlite", i)->Get<Anope::string>("name", "sqlite/main") == cname)
+					break;
+
+			if (i == num)
+			{
+				Log(LOG_NORMAL, "sqlite") << "SQLite: Removing server connection " << cname;
+
+				delete s;
+				this->SQLiteServices.erase(cname);
+			}
+		}
+
+		for (int i = 0; i < config->CountBlock("sqlite"); ++i)
+		{
+			Configuration::Block *block = config->GetBlock("sqlite", i);
+			Anope::string connname = block->Get<Anope::string>("name", "sqlite/main");
+
+			if (this->SQLiteServices.find(connname) == this->SQLiteServices.end())
+			{
+				Anope::string database = Anope::DataDir + "/" + block->Get<Anope::string>("database", "anope");
+
+				try
+				{
+					SQLiteService *ss = new SQLiteService(this, connname, database);
+					this->SQLiteServices[connname] = ss;
+
+					Log(LOG_NORMAL, "sqlite") << "SQLite: Successfully added database " << database;
+				}
+				catch (const SQL::Exception &ex)
+				{
+					Log(LOG_NORMAL, "sqlite") << "SQLite: " << ex.GetReason();
+				}
+			}
+		}
+	}
+};
+
+SQLiteService::SQLiteService(Module *o, const Anope::string &n, const Anope::string &d)
+: Provider(o, n), database(d), sql(NULL)
+{
+	int db = sqlite3_open_v2(database.c_str(), &this->sql, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0);
+	if (db != SQLITE_OK)
+		throw SQL::Exception("Unable to open SQLite database " + database + ": " + sqlite3_errmsg(this->sql));
+}
+
+SQLiteService::~SQLiteService()
+{
+	sqlite3_interrupt(this->sql);
+	sqlite3_close(this->sql);
+}
+
+void SQLiteService::Run(Interface *i, const Query &query)
+{
+	Result res = this->RunQuery(query);
+	if (!res.GetError().empty())
+		i->OnError(res);
+	else
+		i->OnResult(res);
+}
+
+Result SQLiteService::RunQuery(const Query &query)
+{
+	Anope::string real_query = this->BuildQuery(query);
+	sqlite3_stmt *stmt;
+	int err = sqlite3_prepare_v2(this->sql, real_query.c_str(), real_query.length(), &stmt, NULL);
+	if (err != SQLITE_OK)
+	{
+		return SQLiteResult(query, real_query, sqlite3_errmsg(this->sql));
+	}
+
+	int id = sqlite3_last_insert_rowid(this->sql);
+	SQLiteResult result(this->sql, id, query, real_query, stmt);
+
+	sqlite3_finalize(stmt);
+
+	return result;
+}
+
+std::vector<Query> SQLiteService::InitSchema(const Anope::string &prefix)
+{
+	std::vector<Query> queries;
+
+	Query t = "CREATE TABLE IF NOT EXISTS `" + prefix + "id` ("
+		"`id`"
+		")";
+	queries.push_back(t);
+
+	t = "CREATE TABLE IF NOT EXISTS `" + prefix + "objects` (`id` PRIMARY KEY, `type`)";
+	queries.push_back(t);
+
+	t = "CREATE TABLE IF NOT EXISTS `" + prefix + "edges` ("
+		"`id`,"
+		"`field`,"
+		"`other_id`,"
+		"PRIMARY KEY (`id`, `field`)"
+		")";
+	queries.push_back(t);
+
+	t = "CREATE INDEX IF NOT EXISTS idx_edge ON `" + prefix + "edges` (other_id)";
+	queries.push_back(t);
+
+	return queries;
+}
+
+std::vector<Query> SQLiteService::Replace(const Anope::string &table, const Query &q, const std::set<Anope::string> &keys)
+{
+	std::vector<Query> queries;
+
+	Anope::string query_text = "INSERT OR IGNORE INTO `" + table + "` (";
+	for (const std::pair<Anope::string, QueryData> &p : q.parameters)
+		query_text += "`" + p.first + "`,";
+	query_text.erase(query_text.length() - 1);
+	query_text += ") VALUES (";
+	for (const std::pair<Anope::string, QueryData> &p : q.parameters)
+		query_text += "@" + p.first + "@,";
+	query_text.erase(query_text.length() - 1);
+	query_text += ")";
+
+	Query query(query_text);
+	query.parameters = q.parameters;
+	queries.push_back(query);
+
+	query_text = "UPDATE `" + table + "` SET ";
+	for (const std::pair<Anope::string, QueryData> &p : q.parameters)
+		if (!keys.count(p.first))
+			query_text += "`" + p.first + "` = @" + p.first + "@,";
+	query_text.erase(query_text.length() - 1);
+	unsigned int i = 0;
+	for (const Anope::string &key : keys)
+	{
+		if (!i++)
+			query_text += " WHERE ";
+		else
+			query_text += " AND ";
+		query_text += "`" + key + "` = @" + key + "@";
+	}
+
+	query = query_text;
+	query.parameters = q.parameters;
+	queries.push_back(query);
+
+	return queries;
+}
+
+std::vector<Query> SQLiteService::CreateTable(const Anope::string &prefix, const Anope::string &table)
+{
+	std::vector<Query> queries;
+
+	if (active_schema.find(prefix + table) == active_schema.end())
+	{
+		Query t = "CREATE TABLE IF NOT EXISTS `" + prefix + table + "` (`id` bigint(20) NOT NULL, PRIMARY KEY (`id`))";
+		queries.push_back(t);
+
+		active_schema[prefix + table];
+	}
+
+	return queries;
+}
+
+std::vector<Query> SQLiteService::AlterTable(const Anope::string &prefix, const Anope::string &table, const Anope::string &field, bool)
+{
+	std::vector<Query> queries;
+	std::set<Anope::string> &s = active_schema[prefix + table];
+
+	if (!s.count(field))
+	{
+		Query t =  "ALTER TABLE `" + prefix + table + "` ADD `" + field + "` COLLATE NOCASE";
+		queries.push_back(t);
+		s.insert(field);
+	}
+
+	return queries;
+}
+
+std::vector<Query> SQLiteService::CreateIndex(const Anope::string &table, const Anope::string &field)
+{
+	std::vector<Query> queries;
+
+	if (indexes[table].count(field))
+		return queries;
+
+	Query t = "CREATE INDEX IF NOT EXISTS idx_" + field + " ON `" + table + "` (" + field + ")";
+	queries.push_back(t);
+
+	indexes[table].insert(field);
+
+	return queries;
+}
+
+Query SQLiteService::BeginTransaction()
+{
+	return Query("BEGIN TRANSACTION");
+}
+
+Query SQLiteService::Commit()
+{
+	return Query("COMMIT");
+}
+
+Serialize::ID SQLiteService::GetID(const Anope::string &prefix)
+{
+	/* must be in a deferred or reserved transaction here for atomic row update */
+
+	Query query("SELECT `id` FROM `" + prefix + "id`");
+	Serialize::ID id;
+
+	Result res = RunQuery(query);
+	if (res.Rows())
+	{
+		id = convertTo<Serialize::ID>(res.Get(0, "id"));
+
+		Query update_query("UPDATE `" + prefix + "id` SET `id` = `id` + 1");
+		RunQuery(update_query);
+	}
+	else
+	{
+		id = 0;
+
+		Query insert_query("INSERT INTO `" + prefix + "id` (id) VALUES(@id@)");
+		insert_query.SetValue("id", 1);
+		RunQuery(insert_query);
+	}
+
+	return id;
+}
+
+Query SQLiteService::GetTables(const Anope::string &prefix)
+{
+	return Query("SELECT name FROM sqlite_master WHERE type='table' AND name LIKE '" + prefix + "%';");
+}
+
+Anope::string SQLiteService::Escape(const Anope::string &query)
+{
+	char *e = sqlite3_mprintf("%q", query.c_str());
+	Anope::string buffer = e;
+	sqlite3_free(e);
+	return buffer;
+}
+
+Anope::string SQLiteService::BuildQuery(const Query &q)
+{
+	Anope::string real_query = q.query;
+
+	for (std::map<Anope::string, QueryData>::const_iterator it = q.parameters.begin(), it_end = q.parameters.end(); it != it_end; ++it)
+	{
+		const QueryData& qd = it->second;
+		Anope::string replacement;
+
+		if (qd.null)
+			replacement = "NULL";
+		else if (!qd.escape)
+			replacement = qd.data;
+		else
+			replacement = "'" + this->Escape(qd.data) + "'";
+
+		real_query = real_query.replace_all_cs("@" + it->first + "@", replacement);
+	}
+
+	return real_query;
+}
+
+MODULE_INIT(ModuleSQLite)
+