1 files changed, 45 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/eth15/channel.se b/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/eth15/channel.se
new file mode 100644
index 000000000..733f4a95b
--- /dev/null
+++ b/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/eth15/channel.se
@@ -0,0 +1,45 @@
+if msg.data[0] == 0:
+    new_id = contract.storage[-1]
+    # store [from, to, value, maxvalue, timeout] in contract storage
+    contract.storage[new_id] = msg.sender
+    contract.storage[new_id + 1] = msg.data[1]
+    contract.storage[new_id + 2] = 0
+    contract.storage[new_id + 3] = msg.value
+    contract.storage[new_id + 4] = 2^254
+    # increment next id
+    contract.storage[-1] = new_id + 10
+    # return id of this channel
+    return(new_id)
+
+# Increase payment on channel: [1, id, value, v, r, s]
+elif msg.data[0] == 1:
+    # Ecrecover native extension; will be a different address in testnet and live
+    ecrecover = 0x46a8d0b21b1336d83b06829f568d7450df36883f
+    # Message data parameters
+    id = msg.data[1] % 2^160
+    value = msg.data[2]
+    # Determine sender from signature
+    h = sha3([id, value], 2)
+    sender = call(ecrecover, [h, msg.data[3], msg.data[4], msg.data[5]], 4)
+    # Check sender matches and new value is greater than old
+    if sender == contract.storage[id]:
+        if value > contract.storage[id + 2] and value <= contract.storage[id + 3]:
+            # Update channel, increasing value and setting timeout
+            contract.storage[id + 2] = value
+            contract.storage[id + 4] = block.number + 1000
+
+# Cash out channel: [2, id]
+elif msg.data[0] == 2:
+    id = msg.data[1] % 2^160
+    # Check if timeout has run out
+    if block.number >= contract.storage[id + 3]:
+        # Send funds
+        send(contract.storage[id + 1], contract.storage[id + 2])
+        # Send refund
+        send(contract.storage[id], contract.storage[id + 3] - contract.storage[id + 2])
+        # Clear storage
+        contract.storage[id] = 0
+        contract.storage[id + 1] = 0
+        contract.storage[id + 2] = 0
+        contract.storage[id + 3] = 0
+        contract.storage[id + 4] = 0