simple payment verification: check targets, use block headers file.

[electrum-nvc.git] / lib / wallet.py

diff --git a/lib/wallet.py b/lib/wallet.py
index 8c53c12..c3f5984 100644 (file)
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -940,119 +940,3 @@ class WalletSynchronizer(threading.Thread):
                 self.wallet.was_updated = False
 
 
-encode = lambda x: x[::-1].encode('hex')
-decode = lambda x: x.decode('hex')[::-1]
-from bitcoin import Hash, rev_hex, int_to_hex
-
-class WalletVerifier(threading.Thread):
-
-    def __init__(self, wallet, config):
-        threading.Thread.__init__(self)
-        self.daemon = True
-        self.config = config
-        self.wallet = wallet
-        self.interface = self.wallet.interface
-        self.interface.register_channel('verifier')
-        self.validated       = config.get('verified_tx',[])
-        self.merkle_roots    = config.get('merkle_roots',{})
-        self.headers         = config.get('block_headers',{})
-        self.lock = threading.Lock()
-        self.saved = True
-
-    def run(self):
-        requested = []
-
-        while True:
-            txlist = self.wallet.get_tx_hashes()
-
-            for tx in txlist:
-                if tx not in self.validated:
-                    if tx not in requested:
-                        requested.append(tx)
-                        self.request_merkle(tx)
-                        self.saved = False
-                        break
-
-            try:
-                r = self.interface.get_response('verifier',timeout=1)
-            except Queue.Empty:
-                if len(self.validated) == len(txlist) and not self.saved:
-                    print "saving verified transactions"
-                    self.config.set_key('verified_tx', self.validated, True)
-                    self.saved = True
-                continue
-
-            # 3. handle response
-            method = r['method']
-            params = r['params']
-            result = r['result']
-
-            if method == 'blockchain.transaction.get_merkle':
-                tx_hash = params[0]
-                tx_height = result.get('block_height')
-                self.merkle_roots[tx_hash] = self.hash_merkle_root(result['merkle'], tx_hash)
-                # if we already have the header, check merkle root directly
-                header = self.headers.get(tx_height)
-                if header:
-                    self.validated.append(tx_hash)
-                    assert header.get('merkle_root') == self.merkle_roots[tx_hash]
-                self.request_headers(tx_height) 
-
-            elif method == 'blockchain.block.get_header':
-                self.validate_header(result)
-
-
-    def request_merkle(self, tx_hash):
-        self.interface.send([ ('blockchain.transaction.get_merkle',[tx_hash]) ], 'verifier')
-        
-
-    def request_headers(self, tx_height, delta=10):
-        headers_requests = []
-        for height in range(tx_height-delta,tx_height+delta): # we might can request blocks that do not exist yet
-            if height not in self.headers:
-                headers_requests.append( ('blockchain.block.get_header',[height]) )
-        self.interface.send(headers_requests,'verifier')
-
-
-    def validate_header(self, header):
-        """ if there is a previous or a next block in the list, check the hash"""
-        height = header.get('block_height')
-        with self.lock:
-            self.headers[height] = header # detect conflicts
-            prev_header = next_header = None
-            if height-1 in self.headers:
-                prev_header = self.headers[height-1]
-            if height+1 in self.headers:
-                next_header = self.headers[height+1]
-
-        if prev_header:
-            prev_hash = self.hash_header(prev_header)
-            assert prev_hash == header.get('prev_block_hash')
-        if next_header:
-            _hash = self.hash_header(header)
-            assert _hash == next_header.get('prev_block_hash')
-            
-        # check if there are transactions at that height
-        for tx_hash in self.wallet.get_transactions_at_height(height):
-            if tx_hash in self.validated: continue
-            # check if we already have the merkle root
-            merkle_root = self.merkle_roots.get(tx_hash)
-            if merkle_root:
-                self.validated.append(tx_hash)
-                assert header.get('merkle_root') == merkle_root
-
-    def hash_header(self, res):
-        header = int_to_hex(res.get('version'),4) \
-            + rev_hex(res.get('prev_block_hash')) \
-            + rev_hex(res.get('merkle_root')) \
-            + int_to_hex(int(res.get('timestamp')),4) \
-            + int_to_hex(int(res.get('bits')),4) \
-            + int_to_hex(int(res.get('nonce')),4)
-        return rev_hex(Hash(header.decode('hex')).encode('hex'))
-
-    def hash_merkle_root(self, merkle_s, target_hash):
-        h = decode(target_hash)
-        for item in merkle_s:
-            is_left = item[0] == 'L'
-            h = Hash( h + decode(item[1:]) ) if is_left else Hash( decode(item[1:]) + h )
-        return encode(h)