add download_file, bool volatile state

hexlib/db.py

@@ -19,6 +19,7 @@ class PersistentState:
 
 class VolatileState:
     """Quick and dirty volatile dict-like redis wrapper"""
+
     def __init__(self, prefix, ttl=3600, **redis_args):
         self.rdb = redis.Redis(**redis_args)
         self.prefix = prefix
@@ -28,6 +29,18 @@ class VolatileState:
         return RedisTable(self, table)
 
 
+class VolatileBooleanState:
+    """Quick and dirty volatile dict-like redis wrapper for boolean values"""
+
+    def __init__(self, prefix, ttl=3600, **redis_args):
+        self.rdb = redis.Redis(**redis_args)
+        self.prefix = prefix
+        self.ttl = ttl
+
+    def __getitem__(self, table):
+        return RedisBooleanTable(self, table)
+
+
 class RedisTable:
     def __init__(self, state, table):
         self._state = state
@@ -51,6 +64,27 @@ class RedisTable:
             yield json.loads(val) if val else None
 
 
+class RedisBooleanTable:
+    def __init__(self, state, table):
+        self._state = state
+        self._table = table
+
+    def __setitem__(self, key, value):
+        if value:
+            self._state.rdb.sadd(self._state.prefix + self._table, str(key))
+        else:
+            self.__delitem__(key)
+
+    def __getitem__(self, key):
+        return self._state.rdb.sismember(self._state.prefix + self._table, str(key))
+
+    def __delitem__(self, key):
+        self._state.rdb.srem(self._state.prefix + self._table, str(key))
+
+    def __iter__(self):
+        return iter(self._state.rdb.smembers(self._state.prefix + self._table))
+
+
 class Table:
     def __init__(self, state, table):
         self._state = state
@@ -132,7 +166,6 @@ def _deserialize(value, col_type):
 
 
 def pg_fetch_cursor_all(cur, name, batch_size=1000):
-
     while True:
         cur.execute("FETCH FORWARD %d FROM %s" % (batch_size, name))
         cnt = 0

hexlib/misc.py

@@ -9,6 +9,18 @@ import siphash
 last_time_called = dict()
 
 
+def retry(attempts, callback=None):
+    def decorate(func):
+        retries = attempts
+        while retries > 0:
+            try:
+                func()
+            except Exception as e:
+                if callback:
+                    callback(e)
+    return decorate
+
+
 def chunks(lst: list, chunk_len: int):
     for i in range(0, len(lst), chunk_len):
         yield lst[i:i + chunk_len]

hexlib/web.py

@@ -1,7 +1,11 @@
 import pickle
 import re
+import os
+from datetime import datetime
 from base64 import b64encode, b64decode
 from http.cookiejar import Cookie
+import requests
+import orjson as json
 
 from dateutil.parser import parse
 from requests.cookies import RequestsCookieJar
@@ -68,3 +72,35 @@ def cookiejar_filter(cj, pattern):
         if re.match(pattern, c.domain):
             filtered_cj.set_cookie(c)
     return filtered_cj
+
+
+def download_file(url, destination, session=None, headers=None, overwrite=False, retries=1, err_cb=None,
+                  save_meta=False):
+    if os.path.exists(destination) and not overwrite:
+        return
+
+    if session is None:
+        session = requests.session()
+
+    while retries > 0:
+        try:
+            r = session.get(url, stream=True, headers=headers)
+
+            with open(destination + ".part", "wb") as f:
+                for chunk in r.iter_content(chunk_size=4096):
+                    if chunk:
+                        f.write(chunk)
+            os.rename(destination + ".part", destination)
+
+            if save_meta:
+                with open(destination + ".meta", "wb") as f:
+                    f.write(json.dumps({
+                        "headers": dict(**r.headers),
+                        "url": url,
+                        "timestamp": datetime.utcnow().replace(microsecond=0).isoformat()
+                    }))
+            break
+        except Exception as e:
+            if err_cb:
+                err_cb(e)
+            retries -= 1

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup
 
 setup(
     name="hexlib",
-    version="1.17",
+    version="1.18",
     description="Misc utility methods",
     author="simon987",
     author_email="me@simon987.net",

test/test_VolatileState.py

@@ -1,5 +1,5 @@
 from unittest import TestCase
-from hexlib.db import VolatileState
+from hexlib.db import VolatileState, VolatileBooleanState
 
 
 class TestVolatileState(TestCase):
@@ -8,7 +8,7 @@ class TestVolatileState(TestCase):
         s = VolatileState(prefix="test1")
         val = {
             "field1": 1,
-            "arr1": [1,2,3]
+            "arr1": [1, 2, 3]
         }
 
         s["a"]["1"] = val
@@ -38,3 +38,33 @@ class TestVolatileState(TestCase):
         del s["c"]["1"]
         self.assertIsNone(s["c"]["1"])
 
+
+class TestVolatileBoolState(TestCase):
+
+    def test_get_set(self):
+        s = VolatileBooleanState(prefix="test1")
+
+        s["a"]["1"] = True
+        s["a"]["2"] = True
+
+        self.assertTrue(s["a"]["1"])
+        self.assertTrue(s["a"]["2"])
+        self.assertFalse(s["a"]["3"])
+
+    def test_iter(self):
+        s = VolatileBooleanState(prefix="test2")
+
+        s["b"]["1"] = True
+        s["b"]["2"] = True
+        s["b"]["3"] = True
+        s["b"]["4"] = True
+
+        self.assertEqual(sum(int(x) for x in s["b"]), 10)
+
+    def test_delete(self):
+        s = VolatileBooleanState(prefix="test3")
+
+        s["c"]["1"] = True
+        self.assertTrue(s["c"]["1"])
+        del s["c"]["1"]
+        self.assertFalse(s["c"]["1"])

test/test_download_file.py

@@ -0,0 +1,29 @@
+from unittest import TestCase
+import os
+
+from hexlib.web import download_file
+
+
+class TestDownloadFile(TestCase):
+
+    def test_download_file(self):
+        download_file("http://ovh.net/files/10Mb.dat", "/tmp/10Mb.dat")
+        self.assertTrue(os.path.exists("/tmp/10Mb.dat"))
+        os.remove("/tmp/10Mb.dat")
+
+    def test_download_file_error(self):
+        exceptions = []
+
+        def cb(ex):
+            exceptions.append(ex)
+
+        download_file("http://thisUrlIsInvalid", "/tmp/file.txt", err_cb=cb, retries=3)
+        self.assertFalse(os.path.exists("/tmp/10Mb.dat"))
+        self.assertEqual(len(exceptions), 3)
+
+    def test_download_file_meta(self):
+        download_file("http://ovh.net/files/10Mb.dat", "/tmp/10Mb.dat", save_meta=True)
+        self.assertTrue(os.path.exists("/tmp/10Mb.dat"))
+        self.assertTrue(os.path.exists("/tmp/10Mb.dat.meta"))
+        os.remove("/tmp/10Mb.dat")
+        # os.remove("/tmp/10Mb.dat.meta")