1 files changed, 53 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/crowdfund.se b/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/crowdfund.se
new file mode 100644
index 000000000..9fd1e0643
--- /dev/null
+++ b/Godeps/_workspace/src/github.com/ethereum/serpent-go/serpent/examples/crowdfund.se
@@ -0,0 +1,53 @@
+data campaigns[2^80](recipient, goal, deadline, contrib_total, contrib_count, contribs[2^50](sender, value))
+
+def create_campaign(id, recipient, goal, timelimit):
+    if self.campaigns[id].recipient:
+        return(0)
+    self.campaigns[id].recipient = recipient
+    self.campaigns[id].goal = goal
+    self.campaigns[id].deadline = block.timestamp + timelimit
+
+def contribute(id):
+    # Update contribution total
+    total_contributed = self.campaigns[id].contrib_total + msg.value
+    self.campaigns[id].contrib_total = total_contributed
+
+    # Record new contribution
+    sub_index = self.campaigns[id].contrib_count
+    self.campaigns[id].contribs[sub_index].sender = msg.sender
+    self.campaigns[id].contribs[sub_index].value = msg.value
+    self.campaigns[id].contrib_count = sub_index + 1
+
+    # Enough funding?
+    if total_contributed >= self.campaigns[id].goal:
+        send(self.campaigns[id].recipient, total_contributed)
+        self.clear(id)
+        return(1)
+
+    # Expired?
+    if block.timestamp > self.campaigns[id].deadline:
+        i = 0
+        c = self.campaigns[id].contrib_count
+        while i < c:
+            send(self.campaigns[id].contribs[i].sender, self.campaigns[id].contribs[i].value)
+            i += 1
+        self.clear(id)
+        return(2)
+
+def progress_report(id):
+    return(self.campaigns[id].contrib_total)
+
+# Clearing function for internal use
+def clear(id):
+    if self == msg.sender:
+        self.campaigns[id].recipient = 0
+        self.campaigns[id].goal = 0
+        self.campaigns[id].deadline = 0
+        c = self.campaigns[id].contrib_count
+        self.campaigns[id].contrib_count = 0
+        self.campaigns[id].contrib_total = 0
+        i = 0
+        while i < c:
+            self.campaigns[id].contribs[i].sender = 0
+            self.campaigns[id].contribs[i].value = 0
+            i += 1