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Diffstat (limited to 'Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/cyberdyne/market.se')
| -rw-r--r-- | Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/cyberdyne/market.se | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/cyberdyne/market.se b/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/cyberdyne/market.se deleted file mode 100644 index 2303a0b60..000000000 --- a/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/cyberdyne/market.se +++ /dev/null @@ -1,117 +0,0 @@ -# Creates a decentralized market between any two subcurrencies - -# Here, the first subcurrency is the base asset and the second -# subcurrency is the asset priced against the base asset. Hence, -# "buying" refers to trading the first for the second, and -# "selling" refers to trading the second for the first - -# storage 0: buy orders -# storage 1: sell orders -# storage 1000: first subcurrency -# storage 1001: last first subcurrency txid -# storage 2000: second subcurrency -# storage 2001: last second subcurrency txid -# storage 3000: current epoch -# storage 4000: price -# storage 4001: volume - -init: - # Heap for buy orders - contract.storage[0] = create('heap.se') - # Heap for sell orders - contract.storage[1] = create('heap.se') -code: - # Initialize with [ first_subcurrency, second_subcurrency ] - if !contract.storage[1000]: - contract.storage[1000] = msg.data[0] # First subcurrency - contract.storage[1001] = -1 - contract.storage[2000] = msg.data[1] # Second subcurrency - contract.storage[2001] = -1 - contract.storage[3000] = block.number / 1000 - stop - first_subcurrency = contract.storage[1000] - second_subcurrency = contract.storage[2000] - buy_heap = contract.storage[0] - sell_heap = contract.storage[1] - # This contract operates in "epochs" of 100 blocks - # At the end of each epoch, we process all orders - # simultaneously, independent of order. This algorithm - # prevents front-running, and generates a profit from - # the spread. The profit is permanently kept in the - # market (ie. destroyed), making both subcurrencies - # more valuable - - # Epoch transition code - if contract.storage[3000] < block.number / 100: - done = 0 - volume = 0 - while !done: - # Grab the top buy and sell order from each heap - topbuy = call(buy_heap, 1) - topsell = call(sell_heap, 1) - # An order is recorded in the heap as: - # Buys: (2^48 - 1 - price) * 2^208 + units of first currency * 2^160 + from - # Sells: price * 2^208 + units of second currency * 2^160 + from - buyprice = -(topbuy / 2^208) - buyfcvalue = (topbuy / 2^160) % 2^48 - buyer = topbuy % 2^160 - sellprice = topsell / 2^208 - sellscvalue = (topsell / 2^160) % 2^48 - seller = topsell % 2^160 - # Heap empty, or no more matching orders - if not topbuy or not topsell or buyprice < sellprice: - done = 1 - else: - # Add to volume counter - volume += buyfcvalue - # Calculate how much of the second currency the buyer gets, and - # how much of the first currency the seller gets - sellfcvalue = sellscvalue / buyprice - buyscvalue = buyfcvalue * sellprice - # Send the currency units along - call(second_subcurrency, [buyer, buyscvalue], 2) - call(first_subcurrency, [seller, sellfcvalue], 2) - if volume: - contract.storage[4000] = (buyprice + sellprice) / 2 - contract.storage[4001] = volume - contract.storage[3000] = block.number / 100 - # Make buy order [0, price] - if msg.data[0] == 0: - # We ask the first subcurrency contract what the last transaction was. The - # way to make a buy order is to send the amount of first currency units that - # you wish to buy with, and then immediately call this contract. For security - # it makes sense to set up a tx which sends both messages in sequence atomically - data = call(first_subcurrency, [], 0, 4) - from = data[0] - to = data[1] - value = data[2] - txid = data[3] - price = msg.data[1] - if txid > contract.storage[1001] and to == contract.address: - contract.storage[1001] = txid - # Adds the order to the heap - call(buy_heap, [0, -price * 2^208 + (value % 2^48) * 2^160 + from], 2) - # Make sell order [1, price] - elif msg.data[0] == 1: - # Same mechanics as buying - data = call(second_subcurrency, [], 0, 4) - from = data[0] - to = data[1] - value = data[2] - txid = data[3] - price = msg.data[1] - if txid > contract.storage[2001] and to == contract.address: - contract.storage[2001] = txid - call(sell_heap, [0, price * 2^208 + (value % 2^48) * 2^160 + from], 2) - # Ask for price - elif msg.data[0] == 2: - return(contract.storage[4000]) - # Ask for volume - elif msg.data[0] == 3: - return(contract.storage[1000]) - # Ask for first currency - elif msg.data[0] == 4: - return(contract.storage[2000]) - # Ask for second currency - elif msg.data[0] == 5: - return(contract.storage[4001]) |