bare bones query manager

  This is a bare bones query manager that will respond just enough
queries to get the server running. The overall structure of the
tables should be almost set but we'd need to handle all queries to
get the server running properly.
  It uses the SQLite3 3.50.2 amalgamation for a database backend so
we can completely avoid having to spin up yet another service for a
separate database system, effectively turning the query manager into
the database itself. This also means that other services such as the
login server and website must go through it to access the data but
it shouldn't be too difficult to replicate the querying mechanism
from the server.
  This design choice was made with a single game server in mind. The
networking protocol is NOT encrypted at all and won't accept remote
connections. For a fully multi-world distributed infrastructure, a
distributed database system like PostgreSQL and MySQL should be
considered.

2 files changed, 187 insertions, 0 deletions

diff --git a/sql/README.txt b/sql/README.txt
new file mode 100644
index 0000000..26f782a
--- /dev/null
+++ b/sql/README.txt
@@ -0,0 +1,10 @@
+	The query manager will properly initialize and upgrade the database schema
+based on files in this folder. The initial schema should be in `schema.sql` and
+upgrades should be in `upgrade-N.sql` where N is a number starting from 1. The
+`upgrade-N.sql` file should take the database from version N to N + 1.
+	The only restriction to these files is that they can't have transaction
+statements ("BEGIN", "ROLLBACK", "COMMIT") because the query manager will
+already bundle them into a transaction that also sets `user_version`, and
+and nested transactions aren't allowed.
+	The current database version can be retrieved with the "PRAGMA user_version"
+query in the SQLite shell.
\ No newline at end of file
diff --git a/sql/schema.sql b/sql/schema.sql
new file mode 100644
index 0000000..18c2938
--- /dev/null
+++ b/sql/schema.sql
@@ -0,0 +1,177 @@
+CREATE TABLE IF NOT EXISTS Worlds (
+	WorldID INTEGER NOT NULL,
+	Name TEXT NOT NULL COLLATE NOCASE,
+	Type INTEGER NOT NULL,
+	RebootTime INTEGER NOT NULL,
+	Address INTEGER NOT NULL,
+	Port INTEGER NOT NULL,
+	MaxPlayers INTEGER NOT NULL,
+	PremiumPlayerBuffer INTEGER NOT NULL,
+	MaxNewbies INTEGER NOT NULL,
+	PremiumNewbieBuffer INTEGER NOT NULL,
+	PRIMARY KEY (WorldID),
+	UNIQUE (Name)
+);
+
+CREATE TABLE IF NOT EXISTS Accounts (
+	AccountID INTEGER NOT NULL,
+	Auth BLOB NOT NULL,
+	EMail TEXT NOT NULL COLLATE NOCASE,
+	PremiumEnd INTEGER NOT NULL,
+	AddPremiumDays INTEGER NOT NULL,
+	PRIMARY KEY (AccountID),
+	UNIQUE (EMail)
+);
+
+-- Character Tables
+--==============================================================================
+CREATE TABLE IF NOT EXISTS Characters (
+	WorldID INTEGER NOT NULL,
+	CharacterID INTEGER NOT NULL,
+	AccountID INTEGER NOT NULL,
+	Name TEXT NOT NULL COLLATE NOCASE,
+	Sex INTEGER NOT NULL,
+	Guild TEXT NOT NULL COLLATE NOCASE DEFAULT '',
+	Rank TEXT NOT NULL COLLATE NOCASE DEFAULT '',
+	Title TEXT NOT NULL COLLATE NOCASE DEFAULT '',
+	PRIMARY KEY (CharacterID),
+	UNIQUE (Name)
+);
+CREATE INDEX IF NOT EXISTS CharactersAccountIndex ON Characters(AccountID);
+CREATE INDEX IF NOT EXISTS CharactersGuildIndex   ON Characters(Guild);
+
+CREATE TABLE IF NOT EXISTS CharacterBuddies (
+	CharacterID INTEGER NOT NULL,
+	BuddyID INTEGER NOT NULL,
+	PRIMARY KEY (CharacterID, BuddyID)
+);
+
+CREATE TABLE IF NOT EXISTS CharacterInvitations (
+	WorldID INTEGER NOT NULL,
+	CharacterID INTEGER NOT NULL,
+	PRIMARY KEY (WorldID, CharacterID)
+);
+
+CREATE TABLE IF NOT EXISTS CharacterRights (
+	CharacterID INTEGER NOT NULL,
+	Right TEXT NOT NULL COLLATE NOCASE,
+	PRIMARY KEY(CharacterID, Right)
+);
+
+CREATE TABLE IF NOT EXISTS OnlineCharacters (
+	CharacterID INTEGER NOT NULL,
+	AccountID INTEGER NOT NULL,
+	IPAddress INTEGER NOT NULL,
+	MultiClient INTEGER NOT NULL,
+	PRIMARY KEY (CharacterID)
+);
+CREATE INDEX IF NOT EXISTS OnlineCharactersAccountIndex ON OnlineCharacters(AccountID);
+
+-- House Tables
+--==============================================================================
+CREATE TABLE IF NOT EXISTS Houses (
+	WorldID INTEGER NOT NULL,
+	HouseID INTEGER NOT NULL,
+	Name TEXT NOT NULL,
+	Rent INTEGER NOT NULL,
+	Description TEXT NOT NULL,
+	Size INTEGER NOT NULL,
+	PositionX INTEGER NOT NULL,
+	PositionY INTEGER NOT NULL,
+	PositionZ INTEGER NOT NULL,
+	Town TEXT NOT NULL,
+	GuildHouse INTEGER NOT NULL,
+	PRIMARY KEY (WorldID, HouseID)
+);
+
+CREATE TABLE IF NOT EXISTS HouseOwners (
+	WorldID INTEGER NOT NULL,
+	HouseID INTEGER NOT NULL,
+	OwnerID INTEGER NOT NULL,
+	PaidUntil INTEGER NOT NULL,
+	PRIMARY KEY (WorldID, HouseID)
+);
+
+-- NOTE(fusion): An auction would have a non null `FinishTime` but it doesn't make
+-- sense to finish an auction just to restart it afterwards so it should only be
+-- set after the first bid, along with `BidderID` and `BidAmount`.
+CREATE TABLE IF NOT EXISTS HouseAuctions (
+	WorldID INTEGER NOT NULL,
+	HouseID INTEGER NOT NULL,
+	BidderID INTEGER,
+	BidAmount INTEGER,
+	FinishTime INTEGER,
+	PRIMARY KEY (WorldID, HouseID)
+);
+
+CREATE TABLE IF NOT EXISTS HouseTransfers (
+	WorldID INTEGER NOT NULL,
+	HouseID INTEGER NOT NULL,
+	NewOwnerID INTEGER NOT NULL,
+	Price INTEGER NOT NULL,
+	PRIMARY KEY (WorldID, HouseID)
+);
+
+CREATE TABLE IF NOT EXISTS HouseAssignments (
+	WorldID INTEGER NOT NULL,
+	HouseID INTEGER NOT NULL,
+	OwnerID INTEGER NOT NULL,
+	Price INTEGER NOT NULL,
+	Timestamp INTEGER NOT NULL
+);
+CREATE INDEX IF NOT EXISTS HouseAssignmentsHouseIndex ON HouseAssignments(WorldID, HouseID);
+CREATE INDEX IF NOT EXISTS HouseAssignmentsOwnerIndex ON HouseAssignments(OwnerID);
+
+-- Banishment Tables
+--==============================================================================
+CREATE TABLE IF NOT EXISTS Banishments (
+	BanishmentID INTEGER NOT NULL,
+	AccountID INTEGER NOT NULL,
+	IPAddress INTEGER NOT NULL,
+	GamemasterID INTEGER NOT NULL,
+	Reason TEXT NOT NULL,
+	Comment TEXT NOT NULL,
+	FinalWarning INTEGER NOT NULL,
+	Until INTEGER NOT NULL,
+	PRIMARY KEY (BanishmentID)
+);
+
+CREATE TABLE IF NOT EXISTS IPBanishments (
+	IPAddress INTEGER NOT NULL,
+	CharacterID INTEGER NOT NULL,
+	GamemasterID INTEGER NOT NULL,
+	Reason TEXT NOT NULL,
+	Comment TEXT NOT NULL,
+	PRIMARY KEY (IPAddress)
+);
+
+CREATE TABLE IF NOT EXISTS Namelocks (
+	CharacterID INTEGER NOT NULL,
+	IPAddress INTEGER NOT NULL,
+	GamemasterID INTEGER NOT NULL,
+	Reason TEXT NOT NULL,
+	Comment TEXT NOT NULL,
+	PRIMARY KEY (CharacterID)
+);
+
+CREATE TABLE IF NOT EXISTS Notations (
+	CharacterID INTEGER NOT NULL,
+	IPAddress INTEGER NOT NULL,
+	GamemasterID INTEGER NOT NULL,
+	Reason TEXT NOT NULL,
+	Comment TEXT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS NotationsCharacterIndex ON Notations(CharacterID);
+
+CREATE TABLE IF NOT EXISTS Statements (
+	Timestamp INTEGER NOT NULL,
+	StatementID INTEGER NOT NULL,
+	CharacterID INTEGER NOT NULL,
+	Statement TEXT NOT NULL,
+	Context TEXT NOT NULL,
+	BanishmentID INTEGER NOT NULL,
+	ReporterID INTEGER NOT NULL,
+	Reason TEXT NOT NULL,
+	Comment TEXT NOT NULL,
+	PRIMARY KEY (Timestamp, StatementID)
+);