atomic swaps

10 files changed, 605 insertions, 12 deletions

diff --git a/.gitignore b/.gitignore
index 28a82f66..f18358f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,5 @@ yarn-error.log
 .pnp*
 .yarn*
 tls.*
+proposal.txt
+leveldb
diff --git a/db/index.js b/db/index.js
index 1b4cc0e4..7f011c9c 100644
--- a/db/index.js
+++ b/db/index.js
@@ -13,6 +13,7 @@ require("./models/codes.js");
 require("./models/invoices.js");
 require("./models/keys.js");
 require("./models/payments.js");
+require("./models/proposals.js");
 require("./models/users.js");
 
 db["User"].hasMany(db["Account"], {
@@ -64,3 +65,8 @@ db["Payment"].belongsTo(db["User"], {
   as: "user",
   foreignKey: "user_id"
 });
+
+db["Proposal"].belongsTo(db["User"], {
+  as: "user",
+  foreignKey: "user_id"
+});
diff --git a/db/models/proposals.js b/db/models/proposals.js
new file mode 100644
index 00000000..350bdab8
--- /dev/null
+++ b/db/models/proposals.js
@@ -0,0 +1,102 @@
+const { DataTypes } = require('sequelize');
+
+const attributes = {
+  id: {
+    type: DataTypes.INTEGER(11),
+    allowNull: false,
+    defaultValue: null,
+    primaryKey: true,
+    autoIncrement: true,
+    comment: null,
+    field: "id"
+  },
+  user_id: {
+    type: DataTypes.INTEGER(11),
+    allowNull: true,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "user_id"
+  },
+  createdAt: {
+    type: DataTypes.DATE,
+    allowNull: false,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "createdAt"
+  },
+  updatedAt: {
+    type: DataTypes.DATE,
+    allowNull: false,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "updatedAt"
+  },
+  a1: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "a1"
+  },
+  a2: {
+    type: DataTypes.STRING(255),
+    allowNull: true,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "a2"
+  },
+  v1: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "v1"
+  },
+  v2: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    defaultValue: null,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "v2"
+  },
+  text: {
+    type: DataTypes.TEXT,
+    allowNull: false,
+    defaultValue: false,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "text"
+  },
+  accepted: {
+    type: DataTypes.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+    primaryKey: false,
+    autoIncrement: false,
+    comment: null,
+    field: "accepted"
+  },
+};
+
+const options = {
+  tableName: "proposals",
+  comment: "",
+  indexes: []
+};
+
+db["Proposal"] = db.define("proposals_model", attributes, options);
diff --git a/db/schema.sql b/db/schema.sql
index 940a3490..ff272a43 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -57,7 +57,7 @@ CREATE TABLE `accounts` (
   `ticker` varchar(255) DEFAULT NULL,
   `precision` int(11) DEFAULT NULL,
   PRIMARY KEY (`id`)
-) ENGINE=InnoDB AUTO_INCREMENT=3730 DEFAULT CHARSET=latin1;
+) ENGINE=InnoDB AUTO_INCREMENT=3731 DEFAULT CHARSET=latin1;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
 --
@@ -98,7 +98,7 @@ CREATE TABLE `invoices` (
   `uuid` varchar(255) DEFAULT NULL,
   `memo` text DEFAULT NULL,
   PRIMARY KEY (`id`)
-) ENGINE=InnoDB AUTO_INCREMENT=4626 DEFAULT CHARSET=latin1;
+) ENGINE=InnoDB AUTO_INCREMENT=4644 DEFAULT CHARSET=latin1;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
 --
@@ -115,7 +115,7 @@ CREATE TABLE `linkingkeys` (
   `createdAt` datetime NOT NULL,
   `updatedAt` datetime NOT NULL,
   PRIMARY KEY (`id`)
-) ENGINE=InnoDB AUTO_INCREMENT=4495 DEFAULT CHARSET=latin1;
+) ENGINE=InnoDB AUTO_INCREMENT=4497 DEFAULT CHARSET=latin1;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
 --
@@ -144,7 +144,29 @@ CREATE TABLE `payments` (
   `preimage` varchar(255) DEFAULT NULL,
   `memo` text DEFAULT NULL,
   PRIMARY KEY (`id`)
-) ENGINE=InnoDB AUTO_INCREMENT=4458 DEFAULT CHARSET=latin1;
+) ENGINE=InnoDB AUTO_INCREMENT=4459 DEFAULT CHARSET=latin1;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Table structure for table `proposals`
+--
+
+DROP TABLE IF EXISTS `proposals`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `proposals` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `a1` varchar(255) DEFAULT NULL,
+  `a2` varchar(255) DEFAULT NULL,
+  `v1` int(11) DEFAULT NULL,
+  `v2` int(11) DEFAULT NULL,
+  `user_id` int(11) DEFAULT NULL,
+  `createdAt` datetime NOT NULL,
+  `updatedAt` datetime NOT NULL,
+  `accepted` tinyint(1) NOT NULL DEFAULT 0,
+  `text` text DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
 --
@@ -192,7 +214,7 @@ CREATE TABLE `users` (
   `fiat` tinyint(1) NOT NULL DEFAULT 0,
   PRIMARY KEY (`id`),
   KEY `ip` (`ip`)
-) ENGINE=InnoDB AUTO_INCREMENT=633 DEFAULT CHARSET=latin1;
+) ENGINE=InnoDB AUTO_INCREMENT=634 DEFAULT CHARSET=latin1;
 /*!40101 SET character_set_client = @saved_cs_client */;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
 
@@ -204,4 +226,4 @@ CREATE TABLE `users` (
 /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
--- Dump completed on 2020-07-17 20:55:55
+-- Dump completed on 2020-07-20 21:16:00
diff --git a/index.js b/index.js
index b40fa99d..82ae8db5 100644
--- a/index.js
+++ b/index.js
@@ -46,6 +46,7 @@ require("./routes/assets");
 require("./routes/invoices");
 require("./routes/payments");
 require("./routes/info");
+require("./routes/swaps");
 require("./routes/users");
 
 if (config.lnurl) {
diff --git a/lib/binance.js b/lib/binance.js
index 1951d820..aa6364c8 100644
--- a/lib/binance.js
+++ b/lib/binance.js
@@ -15,9 +15,13 @@ module.exports = () => {
         rates[symbol] = msg.c * fx[symbol];
       });
 
+      app.set("ask", msg.a);
+      app.set("last", msg.l);
+      app.set("balance", await lq.getBalance());
       app.set("rates", rates);
+      checkQueue();
     } catch (e) {
-      l.error("binance socket error", e);
+      l.error("binance socket error", e.message);
     }
   };
 
diff --git a/lib/sockets.js b/lib/sockets.js
index 2dae9e93..87317a16 100644
--- a/lib/sockets.js
+++ b/lib/sockets.js
@@ -114,10 +114,10 @@ wss.on("connection", function (ws, req) {
             user_id: ws.user.id,
             id: data.id,
           },
-            include: {
-              model: db.Account,
-              as: "account",
-            },
+          include: {
+            model: db.Account,
+            as: "account",
+          },
         });
         if (payment) {
           payment.memo = data.memo;
diff --git a/package.json b/package.json
index 49cdffa6..84d270ec 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
     "http-proxy-middleware": "^0.20.0",
     "jsonwebtoken": "^8.5.1",
     "knex": "^0.21.1",
+    "level": "^6.0.1",
     "lnurl": "https://github.com/asoltys/lnurl-node",
     "long": "^4.0.0",
     "mailgun-js": "^0.22.0",
diff --git a/routes/swaps.js b/routes/swaps.js
new file mode 100644
index 00000000..8edf4863
--- /dev/null
+++ b/routes/swaps.js
@@ -0,0 +1,259 @@
+const level = require("level");
+const fs = require("fs");
+const { spawn } = require("child_process");
+const leveldb = level("leveldb");
+
+const assets = {
+  b2e15d0d7a0c94e4e2ce0fe6e8691b9e451377f6e46e8045a86f7c4b5d4f0f23: "bitcoin",
+  "4eebe36eb0819e6daa5dd3c97733251ff4eb728c810d949365d6dacaad5ef6e8": "tether",
+};
+
+const createProposal = (a1, v1, a2, v2) =>
+  new Promise((resolve, reject) => {
+    l.info("running liquid-cli tool %s %s %s %s %s", config.liquid.conf, a1, v1, a2, v2);
+    const proc = spawn("liquidswap-cli", [
+      "--regtest",
+      "-c",
+      config.liquid.conf,
+      "propose",
+      a1,
+      v1,
+      a2,
+      v2,
+    ]);
+
+    proc.stdout.on("data", (data) => {
+      fs.writeFile("proposal.txt", data.toString(), function (err) {
+        if (err) {
+          return l.error(err);
+        }
+        l.info("proposal.txt file saved");
+      });
+      resolve(data.toString());
+    });
+
+    proc.stderr.on("error", (err) => {
+      l.error("proposal error", err.toString());
+      reject(err.toString());
+    });
+  });
+
+const getInfo = () =>
+  new Promise((resolve, reject) => {
+    const spawn = require("child_process").spawn;
+    const proc = spawn("liquidswap-cli", [
+      "--regtest",
+      "-c",
+      config.liquid.conf,
+      "info",
+      "proposal.txt",
+    ]);
+
+    proc.stdout.on("data", (data) => {
+      resolve(data.toString());
+    });
+
+    proc.stderr.on("data", (err) => {
+      l.error("info error", err.toString());
+      reject(err.toString());
+    });
+
+    setTimeout(() => reject("timeout"), 2000);
+  });
+
+app.get("/proposal", auth, async (req, res) => {
+  try {
+    const { user } = req;
+    const { a1, v1, a2, v2 } = req.query;
+    const b = app.get("balance");
+
+    Object.keys(b).map((asset) => {
+      assets[asset] = asset;
+    });
+    assets["b2e15d0d7a0c94e4e2ce0fe6e8691b9e451377f6e46e8045a86f7c4b5d4f0f23"] =
+      "bitcoin";
+
+    if (!(assets[a1] && assets[a2])) throw new Error("unsupported assets");
+    if (v1 > b[assets[a1]]) throw new Error("not enough funds");
+
+    l.info(
+      `proposal requested to swap ${v1} ${assets[a1]} for ${v2} ${assets[a2]}`
+    );
+
+    let proposal = await createProposal(a1, v1, a2, v2);
+    proposal = proposal.replace(/\s+/g, "").trim();
+
+    const info = JSON.parse(await getInfo());
+    const [fee, rate, asset] = parse(info);
+
+    if (!rate) throw new Error("invalid asset pair");
+    if (rate < 0)
+      throw new Error(`${assets[a1]} amount must be greater than ${fee}`);
+
+    await db.Proposal.create({
+      a1,
+      a2,
+      v1: Math.round(v1 * SATS),
+      v2: Math.round(v2 * SATS),
+      user_id: user.id,
+      text: proposal,
+    }); 
+
+    res.send({ proposal, info, rate, asset });
+  } catch (e) {
+    l.error(e);
+    res.status(500).send({ error: e.message });
+  }
+});
+
+app.post("/acceptance", async (req, res) => {
+  const { acceptance: text } = req.body;
+  l.info("acceptance received");
+
+  fs.writeFile("accepted.txt", text, async (err) => {
+    if (err) {
+      return res.status(500).send(err);
+    }
+
+    try {
+      let info = JSON.parse(
+        await new Promise((resolve, reject) => {
+          const spawn = require("child_process").spawn;
+          const proc = spawn("liquidswap-cli", [
+            "--regtest",
+            "-c",
+            config.liquid.conf,
+            "info",
+            "accepted.txt",
+          ]);
+
+          proc.stdout.on("data", (data) => {
+            resolve(data.toString());
+          });
+
+          proc.stderr.on("data", (err) => {
+            reject(err.toString());
+          });
+
+          setTimeout(() => reject("timeout", proc), 2000);
+        })
+      );
+
+      const time = Math.floor(new Date()).toString();
+      const [fee, rate, asset] = parse(info);
+      if (!asset) throw new Error("unsupported asset");
+      l.info("accepted", info, rate, asset);
+
+      leveldb.put(time, JSON.stringify({ text, info, rate, asset }));
+      l.info({ text, info, rate, asset });
+
+      res.send({ info, rate });
+    } catch (e) {
+      l.error(e);
+      res.status(500).send({ error: e });
+    }
+  });
+});
+
+checkQueue = async () => {
+  const ws = app.get("ws");
+  const txs = [];
+
+  leveldb.createReadStream()
+    .on("data", async function (data) {
+      console.log("pushing", data.key);
+      txs.push({ ...JSON.parse(data.value), key: data.key });
+    })
+    .on("end", async function (data) {
+      const rate = (a, b) => a.rate - b.rate;
+      const time = (a, b) => b.time - a.time;
+
+      const pending = txs.filter((tx) => !tx.id);
+      const completed = txs.filter((tx) => tx.id).sort(time);
+
+      const bitcoin = pending
+        .filter((tx) => tx.asset === "bitcoin")
+        .sort(rate)
+        .reverse();
+      const tether = pending
+        .filter((tx) => tx.asset === "tether")
+        .sort(rate)
+        .reverse();
+
+      const strip = (a) =>
+        a.map(({ id, key, info, rate, time }) => ({
+          id,
+          key,
+          info,
+          rate,
+          time,
+        }));
+
+      ws &&
+        ws.send(
+          JSON.stringify({
+            completed: strip(completed.slice(0, 3)),
+            bitcoin: strip(bitcoin.slice(0, 3)),
+            tether: strip(tether.slice(0, 3)),
+          })
+        );
+
+      let b, t, tx;
+      if (bitcoin[0]) b = bitcoin[0].rate - app.get("ask");
+      if (tether[0]) t = tether[0].rate - 1 / app.get("bid");
+
+      if (b > 0 || t > 0) {
+        if ((b && !t) || b > t) tx = bitcoin[0];
+        if ((t && !b) || t > b) tx = tether[0];
+      }
+
+      if (tx) {
+        try {
+          tx.id = JSON.parse(await finalize(tx.text)).txid;
+          tx.time = Date.now();
+          delete tx.text;
+          leveldb.put(tx.key, JSON.stringify(tx));
+        } catch (e) {
+          l.info(e);
+          if (e.includes("Unexpected fees")) leveldb.del(tx.key);
+          if (e.includes("unsigned inputs")) leveldb.del(tx.key);
+          if (e.includes("insufficient fee")) leveldb.del(tx.key);
+        }
+      }
+    });
+};
+
+const parse = (info) => {
+  const fee = info.legs[0].fee;
+  return [
+    fee,
+    (info.legs[1].amount / (info.legs[0].amount + fee)).toFixed(8),
+    assets[info.legs[0].asset],
+  ];
+};
+
+const finalize = (text) => {
+  fs.writeFileSync("accepted.txt", text);
+
+  return new Promise((resolve, reject) => {
+    const spawn = require("child_process").spawn;
+    const proc = spawn("liquidswap-cli", [
+      "--regtest",
+      "-c",
+      config.liquid.conf,
+      "finalize",
+      "accepted.txt",
+      "--send",
+    ]);
+
+    proc.stdout.on("data", (data) => {
+      resolve(data.toString());
+    });
+
+    proc.stderr.on("data", (err) => {
+      reject(err.toString());
+    });
+
+    setTimeout(() => reject("timeout"), 2000);
+  });
+};
diff --git a/yarn.lock b/yarn.lock
index 013df81a..4e80e257 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -379,6 +379,19 @@ __metadata:
   languageName: node
   linkType: hard
 
+"abstract-leveldown@npm:^6.2.1, abstract-leveldown@npm:~6.2.1, abstract-leveldown@npm:~6.2.3":
+  version: 6.2.3
+  resolution: "abstract-leveldown@npm:6.2.3"
+  dependencies:
+    buffer: ^5.5.0
+    immediate: ^3.2.3
+    level-concat-iterator: ~2.0.0
+    level-supports: ~1.0.0
+    xtend: ~4.0.0
+  checksum: 193fd90d2110b63bf46aa761f18b3cb8c6e774d5b969c4b5ff8230d215b8982eac9edb8e10dcda7d9ccef361a845bcaa99e6a510d4ba7215a709b3d3ffffee8a
+  languageName: node
+  linkType: hard
+
 "accepts@npm:~1.3.5, accepts@npm:~1.3.7":
   version: 1.3.7
   resolution: "accepts@npm:1.3.7"
@@ -1180,7 +1193,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"buffer@npm:^5.5.0":
+"buffer@npm:^5.5.0, buffer@npm:^5.6.0":
   version: 5.6.0
   resolution: "buffer@npm:5.6.0"
   dependencies:
@@ -1554,6 +1567,7 @@ __metadata:
     http-proxy-middleware: ^0.20.0
     jsonwebtoken: ^8.5.1
     knex: ^0.21.1
+    level: ^6.0.1
     lnurl: "https://github.com/asoltys/lnurl-node"
     long: ^4.0.0
     mailgun-js: ^0.22.0
@@ -1992,6 +2006,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"deferred-leveldown@npm:~5.3.0":
+  version: 5.3.0
+  resolution: "deferred-leveldown@npm:5.3.0"
+  dependencies:
+    abstract-leveldown: ~6.2.1
+    inherits: ^2.0.3
+  checksum: 2d2dbff3db68635a872218145b6c88f37358d26e31cf9e1efda229a68a56b420f82278794915c4ceb7129a651facfad4e44c8b6740d43733da6f808d981ac014
+  languageName: node
+  linkType: hard
+
 "define-properties@npm:^1.1.2, define-properties@npm:^1.1.3":
   version: 1.1.3
   resolution: "define-properties@npm:1.1.3"
@@ -2260,6 +2284,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"encoding-down@npm:^6.3.0":
+  version: 6.3.0
+  resolution: "encoding-down@npm:6.3.0"
+  dependencies:
+    abstract-leveldown: ^6.2.1
+    inherits: ^2.0.3
+    level-codec: ^9.0.0
+    level-errors: ^2.0.0
+  checksum: 002e025e623647585f410e9184840bbdec3451e7473b27dba75d89e7c031b8aef51b16aa21bd3955ef2f5f57ead57a477715d7234b677885c14f5f3af69a8873
+  languageName: node
+  linkType: hard
+
 "end-of-stream@npm:^1.1.0, end-of-stream@npm:^1.4.1":
   version: 1.4.4
   resolution: "end-of-stream@npm:1.4.4"
@@ -2285,6 +2321,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"errno@npm:~0.1.1":
+  version: 0.1.7
+  resolution: "errno@npm:0.1.7"
+  dependencies:
+    prr: ~1.0.1
+  bin:
+    errno: ./cli.js
+  checksum: 3d2da6fa1e3826dead7e06476cb4219555e8492c4ba8e0c40b2dc333e9b52e33223a414a394d7b9f18f82740aa69861c5fcef5b80798f08ff903c7c78916ce14
+  languageName: node
+  linkType: hard
+
 "error@npm:^7.2.0":
   version: 7.2.1
   resolution: "error@npm:7.2.1"
@@ -3449,6 +3496,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"immediate@npm:^3.2.3":
+  version: 3.3.0
+  resolution: "immediate@npm:3.3.0"
+  checksum: 782748e9f02525960109b59738f123d0960bd857131f20ed851d27f664cec5b1528d10d145683652487df9b723c9fa6a01dc796c721e93b74362a722356649b7
+  languageName: node
+  linkType: hard
+
 "import-lazy@npm:^2.1.0":
   version: 2.1.0
   resolution: "import-lazy@npm:2.1.0"
@@ -4135,6 +4189,109 @@ __metadata:
   languageName: node
   linkType: hard
 
+"level-codec@npm:^9.0.0":
+  version: 9.0.2
+  resolution: "level-codec@npm:9.0.2"
+  dependencies:
+    buffer: ^5.6.0
+  checksum: 3474cadde6f6221caff2e464c8ffd50761ee05dbb9d3d1259eca9bcca2a733f1de839cf2ea3ed7e2dbc5b01436096a6fc5606b9df2a0b796f96f53dce27b9105
+  languageName: node
+  linkType: hard
+
+"level-concat-iterator@npm:~2.0.0":
+  version: 2.0.1
+  resolution: "level-concat-iterator@npm:2.0.1"
+  checksum: d5ac362a950bcf63bc19c4e8d397055c9bbd335eea2c56f7de372d38c66147d6db2430596025861d99820f890a9881aef9a192ee62b109ccf0885c0b5c5c2586
+  languageName: node
+  linkType: hard
+
+"level-errors@npm:^2.0.0, level-errors@npm:~2.0.0":
+  version: 2.0.1
+  resolution: "level-errors@npm:2.0.1"
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   resolution: "ncp@npm:2.0.0"
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+  resolution: "node-gyp-build@npm:4.1.1"
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+    node-gyp-build-optional: ./optional.js
+    node-gyp-build-test: ./build-test.js
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+  languageName: node
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   resolution: "node-gyp@npm:7.0.0"
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+  resolution: "prr@npm:1.0.1"
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   resolution: "ps-list@npm:6.3.0"
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+  resolution: "xtend@npm:4.0.2"
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+  languageName: node
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   resolution: "y18n@npm:3.2.1"