add simple db state

.gitignore

@@ -1,2 +1,3 @@
 *.iml
-.idea/
+.idea/
+*.db

hexlib/db.py

@@ -0,0 +1,82 @@
+import sqlite3
+
+
+class PersistentState:
+    """Quick and dirty persistent dict-like SQLite wrapper"""
+
+    def __init__(self, dbfile="state.db"):
+        self.dbfile = dbfile
+
+    def __getitem__(self, table):
+        return Table(self, table)
+
+
+class Table:
+    def __init__(self, state, table):
+        self._state = state
+        self._table = table
+
+    def __iter__(self):
+        with sqlite3.connect(self._state.dbfile) as conn:
+            conn.row_factory = sqlite3.Row
+            try:
+                cur = conn.execute("SELECT * FROM %s" % (self._table,))
+                for row in cur:
+                    yield dict(row)
+            except:
+                return None
+
+    def __getitem__(self, item):
+        with sqlite3.connect(self._state.dbfile) as conn:
+            conn.row_factory = sqlite3.Row
+            try:
+                cur = conn.execute("SELECT * FROM %s WHERE id=?" % (self._table,), (item,))
+
+                row = cur.fetchone()
+                if row:
+                    return dict(row)
+            except:
+                return None
+
+    def __setitem__(self, key, value):
+
+        with sqlite3.connect(self._state.dbfile) as conn:
+            conn.row_factory = sqlite3.Row
+
+            sql = "INSERT INTO %s (id,%s) VALUES ('%s',%s)" % \
+                  (self._table, ",".join(value.keys()), key, ",".join(_sqlite_value(v) for v in value.values()))
+
+            try:
+                conn.execute(sql)
+            except sqlite3.OperationalError:
+                conn.execute(
+                    "create table if not exists %s (id text primary key,%s)" %
+                    (self._table, ",".join("%s %s" % (k, _sqlite_type(v)) for k, v in value.items()))
+                )
+                conn.execute(sql)
+
+            except sqlite3.IntegrityError:
+                conn.execute(
+                    "UPDATE %s SET (%s) = (%s) WHERE id=?" %
+                    (self._table, ",".join(value.keys()), ",".join(_sqlite_value(v) for v in value.values())),
+                    (key,)
+                )
+
+
+def _sqlite_type(value):
+    if isinstance(value, int):
+        return "integer"
+    if isinstance(value, float):
+        return "real"
+    if isinstance(value, bytes):
+        return "blob"
+    return "text"
+
+
+def _sqlite_value(value):
+    if isinstance(value, str):
+        return '"%s"' % value
+    if isinstance(value, bytes):
+        return _sqlite_value(value.decode("unicode_escape"))
+    return str(value)
+

setup.py

@@ -2,12 +2,12 @@ from setuptools import setup
 
 setup(
     name="hexlib",
-    version="1.0",
+    version="1.1",
     description="Misc utility methods",
     author="simon987",
     author_email="me@simon987.net",
     packages=["hexlib"],
     install_requires=[
-        "ImageHash", "influxdb",
+        "ImageHash", "influxdb", "siphash"
     ]
 )