Add store test, move store to subdir module

chainqueue/store/__init__.py

@@ -0,0 +1,5 @@
+from .base import (
+        to_key,
+        from_key,
+        Store,
+        )

chainqueue/store/fs.py

@@ -0,0 +1,70 @@
+# standard imports
+import os
+import logging
+
+# external imports
+from leveldir.hex import HexDir
+
+logg = logging.getLogger(__name__)
+
+
+class IndexStore(HexDir):
+
+    def __init__(self, root_path, digest_bytes=32):
+        os.path.join(root_path, 'contents')
+        self.store = HexDir(root_path, digest_bytes)
+
+
+    def put(self, k, v):
+        kb = bytes.fromhex(k)
+        vb = v.encode('utf-8')
+        self.store.add(kb, vb)
+
+
+    def get(self, k):
+        fp = self.store.to_filepath(k)
+        f = open(fp, 'rb')
+        v = f.read()
+        f.close()
+        return v.decode('utf-8')
+
+
+class CounterStore:
+
+    def __init__(self, root_path):
+        try:
+            os.stat(root_path)
+        except FileNotFoundError:
+            os.makedirs(root_path)
+
+        fp = os.path.join(root_path, '.counter')
+        f = None
+        try:
+            f = open(fp, 'rb+')
+        except FileNotFoundError:
+            logg.debug('counter not found, creating new in {}'.format(fp))
+            f = open(fp, 'wb+')
+            f.write(b'\x00' * 8)
+            f.close()
+            f = open(fp, 'rb+')
+    
+        v = f.read(8)
+        self.count = int.from_bytes(v, byteorder='big')
+        logg.info('counter starts at {}'.format(self.count))
+    
+        f.seek(0)
+
+        self.f = f
+
+
+    def __del__(self):
+        self.f.close()
+
+
+    def next(self):
+        c = self.count
+        self.count += 1
+        v = self.count.to_bytes(8, 'big')
+        self.f.write(v)
+        self.f.seek(0)
+        return c