Add cache handling

tests/test_cache.py

@@ -0,0 +1,71 @@
+# standard imports
+import os
+import logging
+import unittest
+import hashlib
+
+# external imports
+from hexathon import add_0x
+
+# local imports
+from chainqueue import QueueEntry
+from chainqueue.cache import (
+        CacheTokenTx,
+        )
+
+# test imports
+from tests.base_shep import TestShepBase
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+
+class MockCacheTokenTx(CacheTokenTx):
+
+    def deserialize(self, signed_tx):
+        h = hashlib.sha1()
+        h.update(signed_tx + b'\x01')
+        z = h.digest()
+        nonce = int.from_bytes(z[:4], 'big')
+        token_value = int.from_bytes(z[4:8], 'big')
+        value = int.from_bytes(z[8:12], 'big')
+        
+        h = hashlib.sha1()
+        h.update(z)
+        z = h.digest()
+        sender = z.hex()
+
+        h = hashlib.sha1()
+        h.update(z)
+        z = h.digest()
+        recipient = z.hex()
+
+        h = hashlib.sha1()
+        h.update(z)
+        z = h.digest()
+        token = z.hex()
+
+        tx = CacheTokenTx()
+        tx.init(nonce, sender, recipient, value)
+        tx.set('src_token', token)
+        tx.set('dst_token', token)
+        tx.set('src_value', token_value)
+        tx.set('dst_value', token_value)
+
+        return tx
+
+
+class TestCache(TestShepBase):
+
+    def setUp(self):
+        super(TestCache, self).setUp()
+        self.tx = MockCacheTokenTx()
+
+    def test_basic_translator(self):
+        a = b'foo'
+        tx = self.tx.deserialize(a)
+        print(tx)
+
+
+if __name__ == '__main__':
+    unittest.main()