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Created December 15, 2013 11:58
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  1. @invalid-email-address Anonymous created this gist Dec 15, 2013.
    13 changes: 13 additions & 0 deletions Makefile
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    HEDGE = node riphedge

    all:
    npm install ripple-lib

    hedge:
    -while date; do \
    $(HEDGE); \
    sleep 100; \
    done

    clean:
    -rm -fr node_modules
    168 changes: 168 additions & 0 deletions riphedge.js
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    var ripple = require("ripple-lib");

    var id = process.env.RIPHEDGE_ID;
    var key = process.env.RIPHEDGE_KEY;

    var west = {
    host: "s_west.ripple.com",
    port: 443,
    secure: true
    };

    var east = {
    host: "s_east.ripple.com",
    port: 443,
    secure: true
    };

    var options = {
    fee_cushion: 1.5,
    servers: [
    east,
    west
    ],
    trusted: false
    };

    var remote = new ripple.Remote(options);

    var delta, xrp;
    var issuer, currency, fiat;
    var index, ledger;

    var ratio = 0.02;

    function start()
    {
    console.log("Connected");
    remote.set_secret(id, key);
    wait();
    }

    function wait()
    {
    console.log("Wait for ledger to close");
    remote.on("ledger_closed", update);
    }

    function update()
    {
    remote.removeListener("ledger_closed", update);
    remote.request_account_offers(id, index, ledger, check);
    }

    function check(error, response)
    {
    var offers;

    if (error) {
    console.log("Failed to get offers");
    return wait();
    }

    offers = response.offers;
    if (!offers.length) {
    console.log("No offers");
    remote.request_account_info(id, setxrp);
    } else if (1 == offers.length) {
    var transaction = remote.transaction();

    console.log("Cancel obsolete offer");
    transaction.offer_cancel(id, offers[0].seq);
    transaction.submit(wait);
    } else {
    console.log("Offers still exist");
    finish();
    }
    }

    function setxrp(error, response)
    {
    if (error) {
    console.log("Failed to get balance");
    return wait();
    }

    xrp = parseFloat(response.account_data.Balance);
    xrp /= 1e6;
    delta = ratio * xrp;
    console.log("Ripples", xrp);

    remote.request_account_lines(id, index, ledger, setfiat);
    }

    function setfiat(error, response)
    {
    var lines, line;

    if (error) {
    console.log("Failed to get lines");
    return wait();
    }

    lines = response.lines;
    if (1 != lines.length) {
    console.log("Only single currency supported");
    return wait();
    }

    line = lines[0];
    issuer = line.account;
    currency = line.currency;
    fiat = parseFloat(line.balance);
    console.log("Fiat", fiat, currency, issuer);

    bid();
    }

    function bid()
    {
    var transaction = remote.transaction();

    var price = (xrp - 2 * delta) / fiat;
    var buy = delta / price;
    var sell = delta;

    buy = buy.toFixed(6) + currency;
    price = price.toFixed(6);
    console.log("Bid", buy, "@", price);
    buy = ripple.Amount.from_human(buy);
    buy.set_issuer(issuer);

    sell = delta.toFixed(6) + "XRP";
    sell = ripple.Amount.from_human(sell);

    transaction.offer_create(id, buy, sell);
    transaction.submit(ask);
    }

    function ask()
    {
    var transaction = remote.transaction();

    var price = (xrp + 2 * delta) / fiat;
    var sell = delta / price;
    var buy = delta;

    sell = sell.toFixed(6) + currency;
    price = price.toFixed(6);
    console.log("Ask", sell, "@", price);
    sell = ripple.Amount.from_human(sell);
    sell.set_issuer(issuer);

    buy = delta.toFixed(6) + "XRP";
    buy = ripple.Amount.from_human(buy);

    transaction.offer_create(id, buy, sell);
    transaction.set_flags("Sell");
    transaction.submit(finish);
    }

    function finish()
    {
    console.log("Disconnect");
    process.exit();
    }

    setTimeout(finish, 1e6);
    remote.connect(start);