updated tests for availability_api.py and also added max_tries(default value is 3) with delay (sleep) between successive API calls. The dealy actually improves the performace of the availability_api interface.

tests/test_availability_api.py

@@ -11,19 +11,20 @@ from waybackpy.exceptions import (
 
 now = datetime.utcnow()
 url = "https://google.com"
-user_agent = "Mozilla/5.0 (Windows NT 5.1; rv:40.0) Gecko/20100101 Firefox/40.0"
+user_agent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36"
 
 rndstr = lambda n: "".join(
     random.choice(string.ascii_uppercase + string.digits) for _ in range(n)
 )
 
-availability_api = WaybackMachineAvailabilityAPI(url, user_agent)
-
 
 def test_oldest():
     """
     Test the oldest archive of Google.com and also checks the attributes.
     """
+    url = "http://google.com"
+    user_agent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36"
+    availability_api = WaybackMachineAvailabilityAPI(url, user_agent)
     oldest = availability_api.oldest()
     oldest_archive_url = oldest.archive_url
     assert "1998" in oldest_archive_url
@@ -39,9 +40,15 @@ def test_newest():
     Assuming that the recent most Google Archive was made no more earlier than
     last one day which is 86400 seconds.
     """
+    url = "https://www.youtube.com/"
+    user_agent = "Mozilla/5.0 (X11; Linux x86_64; rv:96.0) Gecko/20100101 Firefox/96.0"
+    availability_api = WaybackMachineAvailabilityAPI(url, user_agent)
     newest = availability_api.newest()
     newest_timestamp = newest.timestamp()
-    assert abs(newest_timestamp - now) < timedelta(seconds=86400)
+    # betting in favor that latest youtube archive was not before the last 3 days
+    # high tarffic sites like youtube are archived mnay times a day, so seems
+    # very reasonable to me.
+    assert abs(newest_timestamp - now) < timedelta(seconds=86400 * 3)
 
 
 def test_invalid_json():
@@ -64,7 +71,7 @@ def test_no_archive():
     """
     with pytest.raises(ArchiveNotInAvailabilityAPIResponse):
         availability_api = WaybackMachineAvailabilityAPI(
-            url="https://%s.com" % rndstr(30), user_agent=user_agent
+            url="https://%s.cn" % rndstr(30), user_agent=user_agent
         )
         archive_url = availability_api.archive_url
 
@@ -77,7 +84,7 @@ def test_no_api_call_str_repr():
     str() must not return None so we return ""
     """
     availability_api = WaybackMachineAvailabilityAPI(
-        url="https://%s.com" % rndstr(30), user_agent=user_agent
+        url="https://%s.gov" % rndstr(30), user_agent=user_agent
     )
     assert "" == str(availability_api)
 
@@ -88,6 +95,6 @@ def test_no_call_timestamp():
     the datetime.max as a default value.
     """
     availability_api = WaybackMachineAvailabilityAPI(
-        url="https://%s.com" % rndstr(30), user_agent=user_agent
+        url="https://%s.in" % rndstr(30), user_agent=user_agent
     )
     assert datetime.max == availability_api.timestamp()

waybackpy/availability_api.py

@@ -14,12 +14,16 @@ class WaybackMachineAvailabilityAPI:
     Class that interfaces the availability API of the Wayback Machine.
     """
 
-    def __init__(self, url, user_agent=DEFAULT_USER_AGENT):
+    def __init__(self, url, user_agent=DEFAULT_USER_AGENT, max_tries=3):
         self.url = str(url).strip().replace(" ", "%20")
         self.user_agent = user_agent
         self.headers = {"User-Agent": self.user_agent}
         self.payload = {"url": "{url}".format(url=self.url)}
         self.endpoint = "https://archive.org/wayback/available"
+        self.max_tries = max_tries
+        self.tries = 0
+        self.last_api_call_unix_time = int(time.time())
+        self.api_call_time_gap = 5
         self.JSON = None
 
     def unix_timestamp_to_wayback_timestamp(self, unix_timestamp):
@@ -53,9 +57,17 @@ class WaybackMachineAvailabilityAPI:
         Makes the API call to the availability API can set the JSON response
         to the JSON attribute of the instance and also returns the JSON attribute.
         """
+        time_diff = int(time.time()) - self.last_api_call_unix_time
+        sleep_time = self.api_call_time_gap - time_diff
+
+        if sleep_time > 0:
+            time.sleep(sleep_time)
+
         self.response = requests.get(
             self.endpoint, params=self.payload, headers=self.headers
         )
+        self.last_api_call_unix_time = int(time.time())
+        self.tries += 1
         try:
             self.JSON = self.response.json()
         except json.decoder.JSONDecodeError:
@@ -100,11 +112,21 @@ class WaybackMachineAvailabilityAPI:
 
         # If data is still not none then probably there are no
         # archive for the requested URL.
+        if not data or not data["archived_snapshots"]:
+            while (self.tries < self.max_tries) and (
+                not data or not data["archived_snapshots"]
+            ):
+                self.json()  # It makes a new API call
+                data = self.JSON  # json() updated the value of JSON attribute
+
+            # Even if after we exhausted teh max_tries, then we give up and
+            # raise exception.
+
             if not data or not data["archived_snapshots"]:
                 raise ArchiveNotInAvailabilityAPIResponse(
                     "Archive not found in the availability "
-                + "API response, maybe the URL you requested does not have any "
+                    + "API response, the URL you requested may not have any "
-                + "archive yet. You may retry after some time or archive the webpage now."
+                    + "archives yet. You may retry after some time or archive the webpage now."
                     + "\nResponse data:\n{response}".format(response=self.response.text)
                 )
         else: