Receive

README.md

@@ -3,7 +3,7 @@
 Luanti mod to exchange in-game [currency](https://github.com/mt-mods/currency) with [libre currency](https://duniter.org) (Ğ1 blockchain).
 
 Luanti server has a dedicated account.
-Player transfer money on it and the server gives them a corresponding amount of in-game banknotes.
+Players transfer money on it and the server gives them a corresponding amount of in-game banknotes.
 They can then do whatever they want with the banknotes (trade, decorate walls, burn...).
 Players can ask the server to transfer their banknotes to an account of their choice using a chat command.
 
@@ -13,6 +13,8 @@ It works with Ğ1v2 which is still in development/testing phase.
 
 Put this repo in the `mods` directory.
 
+Add `g1_bridge` to `secure.http_mods`.
+
 Have a local Duniter node.
 
 ```bash
@@ -31,6 +33,7 @@ Have a local Duniter node.
 * Ensure all transfers are failproof (any communication, storage medium, server or whatever should be able to fail or rollback to a previous state, without causing double spend or money loss)
 * Force reception account to exist
 * Nice ATM-like interface
+* Accept mixed values (other banknotes values than 1)
 
 ## Workflow
 

g1bridge/Cargo.toml

@@ -6,13 +6,16 @@ edition = "2024"
 [dependencies]
 argp = "0.4.0"
 codec = { package = "parity-scale-codec", version = "3.6.12" }
+hex = "0.4.3"
 log = "0.4.27"
+reqwest = { version = "0.11.27", features = ["json"] }
 scrypt = { version = "0.11.0", default-features = false }
 serde = { version = "1.0.219", features = ["derive"] }
+serde_json = "1.0.140"
 simplelog = "0.12.2"
-sp-core = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.11.0" }
-sp-runtime = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.11.0" }
-subxt = { git = 'https://github.com/duniter/subxt', branch = 'subxt-v0.35.3-duniter-substrate-v1.11.0', default-features = false, features = [
+sp-core = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.14.0" }
+sp-runtime = { git = "https://github.com/duniter/duniter-polkadot-sdk.git", branch = "duniter-substrate-v1.14.0" }
+subxt = { git = 'https://github.com/duniter/subxt', branch = 'subxt-v0.37.0-duniter-substrate-v1.14.0', default-features = false, features = [
 	"substrate-compat",
 	"native",
 	"jsonrpsee",
@@ -21,5 +24,10 @@ tiny_http = "0.12.0"
 tokio = { version = "1.38.0", features = ["macros", "rt-multi-thread"] }
 typed-sled = "0.2.3"
 
+# some dependency forgot to specify revision of another git dep...
+[patch.'https://github.com/w3f/fflonk']
+# https://github.com/rust-lang/cargo/issues/5478
+fflonk = { git = "https://github.com//w3f/fflonk.git", rev = "1e854f35e9a65d08b11a86291405cdc95baa0a35" }
+
 [profile.release]
 lto = "fat"

g1bridge/res/indexer-queries.graphql

@@ -0,0 +1,12 @@
+query ReceivedTransactions($address: String!, $block: Int!) {
+	tx: transfer(where: { blockNumber: { _gt: 1 }, to: { id: { _eq: "" } } }) {
+		amount
+		comment {
+			remark
+		}
+	}
+	b: block(limit: 1, orderBy: { height: DESC }) {
+		height
+		hash
+	}
+}

g1bridge/src/indexer.rs

@@ -0,0 +1,51 @@
+use serde::Deserialize;
+
+/*
+[
+	{
+		"data": {
+			"transfer": [
+				{
+					"amount": 42,
+					"comment": null
+				},
+				{
+					"amount": 30,
+					"comment": {"remark": "tuxmain"}
+				}
+			],
+			"block": [
+				{
+					"height": 7040132,
+					"hash": "\\xe669ff0d26dc9c48ec905916d39b0f11447cf63a37c0d1094f19cdfbbb199c67"
+				}
+			]
+		}
+	}
+]
+
+*/
+#[derive(Debug, Deserialize)]
+pub struct Comment {
+	pub remark: String,
+}
+#[derive(Debug, Deserialize)]
+pub struct Transfer {
+	pub amount: u64,
+	pub comment: Option<Comment>,
+}
+#[derive(Debug, Deserialize)]
+pub struct Block {
+	pub height: u64,
+	pub hash: String,
+}
+#[derive(Debug, Deserialize)]
+pub struct Data {
+	pub transfer: Vec<Transfer>,
+	pub block: Vec<Block>,
+}
+#[derive(Debug, Deserialize)]
+pub struct DataWrapper {
+	pub data: Data,
+}
+pub type Response = Vec<DataWrapper>;

g1bridge/src/main.rs

@@ -1,22 +1,23 @@
 #![feature(try_blocks)]
 
 mod blockchain;
+mod indexer;
+mod response;
 
 use argp::FromArgs;
-use serde::{Deserialize, Serialize, de};
+use serde::{Deserialize, Serialize};
 use sp_core::Pair as _;
 use std::{
-	io::{BufRead, Read},
-	str::FromStr,
-	sync::Arc,
+	collections::{hash_map::Entry, HashMap}, io::{BufRead, Read}, str::FromStr, sync::Arc
 };
 use subxt::{
-	ext::sp_core::ed25519::{Pair, Public},
-	utils::{AccountId32, MultiAddress},
+	ext::sp_core::ed25519::Pair,
+	utils::AccountId32,
 };
-use tiny_http::{Response, ResponseBox, Server, ServerConfig};
+use tiny_http::{Response, ResponseBox, Server};
 use tokio::sync::mpsc::{Sender, channel};
 use typed_sled::Tree;
+use log::error;
 
 /// Game to Blockchain
 const TREE_DEBT_G2B: &'static str = "debt_g2b";
@@ -28,6 +29,10 @@ struct Opt {
 	#[argp(option, short = 'd')]
 	db: String,
 
+	/// Duniter indexer URL
+	#[argp(option, short = 'i', default = "String::from(\"https://squid.gdev.gyroi.de/v1/graphql\")")]
+	indexer: String,
+
 	/// secret key is legacy (two passwords on the two first lines)
 	#[argp(switch, short = 'l')]
 	legacy: bool,
@@ -80,12 +85,16 @@ async fn main() {
 			.expect("Cannot read secret key file");
 		Pair::from_string(sk_content.trim(), None).expect("Cannot decode secret key")
 	};
+	let pk: AccountId32 = pair.public().into();
+	let pk_str = pk.to_string();
 
 	simplelog::SimpleLogger::init(log::LevelFilter::Debug, simplelog::Config::default()).unwrap();
 
 	let db = typed_sled::open(opt.db).expect("Cannot open database");
 	let tree_debt_g2b = Tree::<DebtG2B, ()>::open(&db, TREE_DEBT_G2B);
 
+	let client = reqwest::Client::new();
+
 	let (bc_send, bc_recv) = channel(128);
 
 	tokio::spawn(blockchain::run(
@@ -100,6 +109,8 @@ async fn main() {
 	struct Locals {
 		tree_debt_g2b: Tree<DebtG2B, ()>,
 		bc_send: Sender<DebtG2B>,
+		indexer: String,
+		pk_str: String,
 	}
 
 	tokio::task_local! {
@@ -110,10 +121,13 @@ async fn main() {
 		Arc::new(Locals {
 			tree_debt_g2b,
 			bc_send,
+			indexer: opt.indexer,
+			pk_str: pk_str,
 		}),
 		async move {
 			for request in server.incoming_requests() {
 				let locals = LOCALS.get();
+				let client = client.clone();
 				tokio::spawn(async move {
 					let url = request.url();
 
@@ -124,7 +138,6 @@ async fn main() {
 							Some("send") => {
 								let address = AccountId32::from_str(url_items.next()?).ok()?;
 								let amount = url_items.next()?.parse::<u64>().ok()?;
-								println!("{address} {amount}");
 
 								let debt = DebtG2B { address, amount };
 								locals.tree_debt_g2b.insert(&debt, &()).ok()?;
@@ -132,6 +145,52 @@ async fn main() {
 
 								Response::empty(200).boxed()
 							}
+							Some("recv") => {
+								let block_number = url_items.next()?.parse::<u64>().ok()?;
+								let req = client.post(&locals.indexer).body(dbg!(format!(
+r#"[{{"query":"{{transfer(where:{{blockNumber:{{_gt:{}}},to:{{id:{{_eq:\"{}\"}}}}}}){{amount comment{{remark}}}}block(limit:1,orderBy:{{height:DESC}}){{height hash}}}}"}}]"#,
+block_number, locals.pk_str))).build().unwrap();
+								let Ok(res) = client.execute(req).await else {
+									request.respond(Response::empty(500)).ok();
+									error!("Error from indexer");
+									return;
+								};
+								let Ok(res) = res.json::<indexer::Response>().await else {
+									request.respond(Response::empty(500)).ok();
+									error!("Bad JSON from indexer");
+									return;
+								};
+								let Some(data) = res.first() else {
+									request.respond(Response::empty(500)).ok();
+									error!("No data from indexer");
+									return;
+								};
+								let Some(block) = data.data.block.first() else {
+									request.respond(Response::empty(500)).ok();
+									error!("No block from indexer");
+									return;
+								};
+								let mut debts = HashMap::<String, u64>::new();
+								for transfer in data.data.transfer.iter() {
+									if let Some(comment) = &transfer.comment {
+										match debts.entry(comment.remark.clone()) {
+											Entry::Occupied(mut debt) => {
+												*debt.get_mut() = debt.get().saturating_add(transfer.amount);
+											}
+											Entry::Vacant(debt) => {
+												debt.insert(transfer.amount);
+											}
+										}
+									}
+								}
+								Response::from_string(serde_json::to_string(&response::Response {
+									block: block.height,
+									debts: debts.into_iter().map(|(name, amount)| response::Debt {
+										name,
+										amount,
+									}).collect(),
+								}).unwrap()).with_status_code(200).boxed()
+							}
 							_ => None?,
 						}
 					};

g1bridge/src/response.rs

@@ -0,0 +1,13 @@
+use serde::Serialize;
+
+#[derive(Serialize)]
+pub struct Debt {
+	pub name: String,
+	pub amount: u64,
+}
+
+#[derive(Serialize)]
+pub struct Response {
+	pub block: u64,
+	pub debts: Vec<Debt>,
+}

init.lua

@@ -1,49 +1,97 @@
+local MG_RATE = 10
+
 local http = minetest.request_http_api()
 if http == nil then
 	error("Please add g1_bridge to secure.http_mods")
 end
 
-minetest.register_chatcommand("g1", {
+local mod_storage = core.get_mod_storage()
+if mod_storage == nil then
+	error("Cannot get mod storage")
+end
+
+function receive_debts()
+	local block = mod_storage:get_int("block")
+	http.fetch({url="http://127.0.0.1:30061/recv/"..block, method="GET"},
+		function(res)
+			if res.code == 200 then
+				local data = minetest.parse_json(res.data)
+				if data == nil or type(data.block) ~= "number" or data.block <= block or type(data.debts) ~= "table" then
+					return
+				end
+				for i, debt in ipairs(data.debts) do
+					if type(debt.name) == "string" and type(debt.amount) == "number" and core.player_exists(debt.name) then
+						local player_debt = mod_storage:get_int("debt_"..debt.name)
+						player_debt = player_debt + debt.amount
+						mod_storage:set_int("debt_"..debt.name, player_debt)
+					end
+				end
+				mod_storage:set_int("block", data.block + 1)
+			end
+		end
+	)
+end
+
+minetest.register_chatcommand("g1_send", {
+	params = "<address> <amount>",
+	description = "Send MineGeld from your inventory to a G1 address. Fixed rate: 1G1=10MG.",
 	func = function(name, param)
 		local args = {}
 		for arg in string.gmatch(param,"%S+") do
-			if #args >= 3 then
+			if #args >= 2 then
 				break
 			end
 			table.insert(args, arg)
 		end
-		if #args >= 1 then
-			core.chat_send_player(name, "args >= 1")
-			if args[1] == "send" and #args == 3 and string.find(args[2],"^[%da-zA-Z]+$") and string.find(args[3],"^%d+$") then
-				local address = args[2]
-				local amount = tonumber(args[3])
+		if #args == 2 and string.find(args[1],"^[%da-zA-Z]+$") and string.find(args[2],"^%d+$") then
+			local address = args[1]
+			local amount_mg = tonumber(args[2])
 			-- This version Lua does not have any way to check if a number is represented as an integer or a float,
 			-- because it explicitely doesn't care.
 			-- Hence, this program won't care if the player writes an invalid number,
 			-- as there is no need to ensure arithmetic rules are respected. (as Lua's manual pretends)
 			-- As the pattern excludes "." and nobody should have billions of items,
 			-- it should still be safe. I hope.
-				if type(amount) ~= "number" then
+			if type(amount_mg) ~= "number" then
 				return
 			end
 			local inv = core.get_inventory({type="player", name=name})
-				local wanted_stack = "currency:minegeld "..amount
+			local wanted_stack = "currency:minegeld "..amount_mg
 			local balanced = inv:contains_item("main", ItemStack(wanted_stack))
 			if balanced then
-					inv:remove_item("main", wanted_stack)
+				local amount = amount_mg * MG_RATE
+				inv:remove_item("main", ItemStack(wanted_stack))
 				http.fetch({url="http://127.0.0.1:30061/send/"..address.."/"..amount, method="GET"},
 					function(res)
-							if res.code == 200 then
+						if res ~= nil and res.code == 200 then
 							core.chat_send_player(name, "Transfer sent")
 						else
-								core.chat_send_player(name, "Error during transfer")
+							core.chat_send_player(name, "Error during transfer, giving your money back")
+							inv:add_item("main", ItemStack(wanted_stack))
 						end
 					end
 				)
 			else
-					core.chat_send_player(name, "Not enough currency")
-				end
+				core.chat_send_player(name, "Not enough money (please ensure it is available in 1MG banknotes)")
 			end
 		end
 	end
 })
+
+minetest.register_chatcommand("g1_claim", {
+	description = "Claim MineGeld from G1 sent to the server",
+	func = function(name, param)
+		receive_debts()
+		local amount = mod_storage:get_int("debt_"..name)
+		local amount_mg = amount / MG_RATE
+		local inv = core.get_inventory({type="player", name=name})
+		local stack = "currency:minegeld "..amount_mg
+		if inv:room_for_item("main", ItemStack(stack)) then
+			inv:add_item("main", ItemStack(stack))
+			core.chat_send_player(name, "Claimed "..amount_mg.."MG")
+			mod_storage:set_int("debt_"..name, 0)
+		else
+			core.chat_send_player(name, "No room in your inventory! Available: "..amount_mg.."MG")
+		end
+	end
+})