From: genjix <fake@lol.u>
Date: Wed, 21 Mar 2012 22:28:55 +0000 (+0000)
Subject: numblocks.subscribe responds with latest block.
X-Git-Url: https://git.novaco.in/?p=electrum-server.git;a=commitdiff_plain;h=c7afa218d4302644ce883b776b943762529664e3

numblocks.subscribe responds with latest block.
---

diff --git a/server-genjix.py b/server-genjix.py
index dab3020..a6cfb1e 100644
--- a/server-genjix.py
+++ b/server-genjix.py
@@ -1,9 +1,127 @@
+import bitcoin
 import stratum
+import threading
+import time
+
+class Backend:
+
+    def __init__(self):
+        self.network_service = bitcoin.async_service(1)
+        self.disk_service = bitcoin.async_service(1)
+        self.mempool_service = bitcoin.async_service(1)
+
+        self.hosts = bitcoin.hosts(self.network_service)
+        self.handshake = bitcoin.handshake(self.network_service)
+        self.network = bitcoin.network(self.network_service)
+        self.protocol = bitcoin.protocol(self.network_service, self.hosts,
+                                         self.handshake, self.network)
+
+        db_prefix = "/home/genjix/libbitcoin/database"
+        self.blockchain = bitcoin.bdb_blockchain(self.disk_service, db_prefix)
+        self.poller = bitcoin.poller(self.blockchain)
+        self.transaction_pool = \
+            bitcoin.transaction_pool(self.mempool_service, self.blockchain)
+
+        self.protocol.subscribe_channel(self.monitor_tx)
+        self.session = \
+            bitcoin.session(self.hosts, self.handshake, self.network,
+                            self.protocol, self.blockchain, self.poller,
+                            self.transaction_pool)
+        self.session.start(self.handle_start)
+
+    def handle_start(self, ec):
+        if ec:
+            print "Error starting backend:", ec
+
+    def stop(self):
+        self.session.stop(self.handle_stop)
+
+    def handle_stop(self, ec):
+        if ec:
+            print "Error stopping backend:", ec
+        print "Stopped backend"
+
+    def monitor_tx(self, node):
+        # We will be notified here when connected to new bitcoin nodes
+        # Here we subscribe to new transactions from them which we
+        # add to the transaction_pool. That way we can track which
+        # transactions we are interested in.
+        node.subscribe_transaction(
+            bitcoin.bind(self.recv_tx, bitcoin._1, bitcoin._2, node))
+        # Re-subscribe to next new node
+        self.protocol.subscribe_channel(self.monitor_tx)
+
+    def recv_tx(self, ec, tx, node):
+        if ec:
+            print "Error with new transaction:", ec
+            return
+        tx_hash = bitcoin.hash_transaction(tx)
+        self.transaction_pool.store(tx,
+            bitcoin.bind(self.tx_confirmed, bitcoin._1, tx_hash),
+            bitcoin.bind(self.handle_mempool_store, bitcoin._1, tx_hash))
+        # Re-subscribe to new transactions from node
+        node.subscribe_transaction(
+            bitcoin.bind(self.recv_tx, bitcoin._1, bitcoin._2, node))
+
+    def handle_mempool_store(self, ec, tx_hash):
+        if ec:
+            print "Error storing memory pool transaction", tx_hash, ec
+        else:
+            print "Accepted transaction", tx_hash
+
+    def tx_confirmed(self, ec, tx_hash):
+        if ec:
+            print "Problem confirming transaction", tx_hash, ec
+        else:
+            print "Confirmed", tx_hash
+
+class NumblocksSubscribe:
+
+    def __init__(self, backend):
+        self.backend = backend
+        self.lock = threading.Lock()
+        self.backend.blockchain.subscribe_reorganize(self.reorganize)
+        self.backend.blockchain.fetch_last_depth(self.set_last_depth)
+        self.latest = None
+
+    def subscribe(self, session, request):
+        last = self.get_last_depth()
+        session.push_response({"id": request["id"], "result": last})
+
+    def get_last_depth(self):
+        # Stall until last depth has been set...
+        # Should use condition variable here instead
+        while True:
+            with self.lock:
+                last = self.latest
+            if last is not None:
+                return last
+            time.sleep(0.1)
+
+    def set_last_depth(self, ec, last_depth):
+        if ec:
+            print "Error retrieving last depth", ec
+        else:
+            with self.lock:
+                self.latest = last_depth
+
+    def reorganize(self, ec, fork_point, arrivals, replaced):
+        pass
 
 class LibbitcoinProcessor(stratum.Processor):
 
+    def __init__(self):
+        self.backend = Backend()
+        self.numblocks_subscribe = NumblocksSubscribe(self.backend)
+        stratum.Processor.__init__(self)
+
+    def stop(self):
+        self.backend.stop()
+
     def process(self, session):
         request = session.pop_request()
+        if request["method"] == "numblocks.subscribe":
+            self.numblocks_subscribe.subscribe(session, request)
         print "New request (lib)", request
         # Execute and when ready, you call
         # session.push_response(response)
diff --git a/stratum.py b/stratum.py
index fab33f9..949fb9f 100644
--- a/stratum.py
+++ b/stratum.py
@@ -32,6 +32,10 @@ class Processor(threading.Thread):
                     # to our internal register
                     self.add_session(session)
                     self.process(session)
+        self.stop()
+
+    def stop(self):
+        pass
 
     def process(self, session):
         request = session.pop_request()