basically mysql is working

exam/ex01/cache.py

@@ -31,16 +31,17 @@ def get_cache(directory, name):
 			, user=config["mysql_user"]
 			, password=config["mysql_password"]
 			, db=config["mysql_database"]
-			, charset="utf8")
+			, charset="utf8mb4")
 
 	cursor = db.cursor()
 
 	cursor.execute("CREATE TABLE IF NOT EXISTS proxies(proxy varchar(100), lasttime_could_not_be_used DECIMAL)")
-	cursor.execute("CREATE TABLE IF NOT EXISTS links(source varchar(50), destination varchar(50))")
+	cursor.execute("CREATE TABLE IF NOT EXISTS links(source varchar(100) CHARACTER SET utf8mb4, destination varchar(100) CHARACTER SET utf8mb4)")
-	cursor.execute("CREATE TABLE IF NOT EXISTS dijkstra_helper(name varchar(50) UNIQUE, value INT)")
+	cursor.execute("CREATE TABLE IF NOT EXISTS dijkstra_helper(name varchar(100) CHARACTER SET utf8mb4 UNIQUE, value INT)")
-	cursor.execute("CREATE TABLE IF NOT EXISTS failed_to_fetch(title varchar(50), depth INT)")
+	cursor.execute("CREATE TABLE IF NOT EXISTS failed_to_fetch(title varchar(100) CHARACTER SET utf8mb4, depth INT)")
 
 	db.commit()
+	fetch_proxies(db)
 	return db
 	
 

exam/ex01/cfg.py

@@ -4,5 +4,5 @@ config = {
 	, "mysql_server": "172.17.0.2"
 	, "mysql_user": "wikipedia"
 	, "mysql_password": "wikipediastuff"
-	, "mysql_database": "wikipedia_link_data"
+	, "mysql_database": "wikipedia_link_db"
 }

exam/ex01/connectivity.py

@@ -4,7 +4,7 @@ from cfg import config
 
 def can_reach(title, connection):
 	cursor = connection.cursor()
-	cursor.execute("SELECT COUNT(destination) FROM links WHERE destination=?", (title, ))
+	cursor.execute("SELECT COUNT(destination) FROM links WHERE destination=%s", (title, ))
 	count = cursor.fetchone()[0]
 	return count > 0
 
@@ -17,20 +17,12 @@ def shortest_path(center, title, connection):
 	path = deque()
 	while(current_title != center):
 		path.append(current_title)
-		if(config["use_sqlite"]):
 		cursor.execute('''SELECT links.source 
 				FROM links
 				LEFT JOIN dijkstra_helper ON links.destination=dijkstra_helper.name
 				WHERE links.destination=:title
 				ORDER BY dijkstra_helper.value ASC
 				LIMIT 1''', {"title": current_title})
-		else:
-			cursor.execute('''SELECT links.source 
-					FROM links
-					LEFT JOIN dijkstra_helper ON links.destination=dijkstra_helper.name
-					WHERE links.destination=:title
-					SORT BY dijkstra_helper.value ASC
-					LIMIT 1''', {"title": current_title})
 		current_title = cursor.fetchone()[0]
 	return list(reversed(path))
 

exam/ex01/dijkstra.py

@@ -50,7 +50,7 @@ def recursive_dijkstra(titles, value, connection):
 
 def dijkstra(title, connection):
 	cursor = connection.cursor()
-	cursor.execute("UPDATE dijkstra_helper SET value=0 WHERE name=?", (title,))
+	cursor.execute("UPDATE dijkstra_helper SET value=0 WHERE name=%s", (title,))
 
 	todos = dijkstra_one(title, 1, connection)
 	recursive_dijkstra(todos, 2, connection)

exam/ex01/proxy.py

@@ -18,10 +18,7 @@ class NoMoreProxiesException(Exception):
 def get_data_with_proxy(url, conn_object, visit_first=None):
 	cursor = conn_object.cursor()
 	# Assume that table name is proxies
-	if(config["use_sqlite"]):
 	cursor.execute('''SELECT proxy, lasttime_could_not_be_used FROM proxies ORDER BY lasttime_could_not_be_used ASC''')
-	else:
-		cursor.execute('''SELECT proxy, lasttime_could_not_be_used FROM proxies SORT BY lasttime_could_not_be_used ASC''')
 	headers = {}
 	for i, lasttime_could_not_be_used in cursor:
 		session = requests.Session()
@@ -30,12 +27,12 @@ def get_data_with_proxy(url, conn_object, visit_first=None):
 			response = session.get(url, headers=headers, timeout=3)
 		except:
 		# If proxy is invalid/inactive, update lasttime could not be used and go next proxy
-			cursor.execute('''UPDATE proxies SET lasttime_could_not_be_used = ? WHERE proxy = ? ''',
+			cursor.execute('''UPDATE proxies SET lasttime_could_not_be_used = %d WHERE proxy = %s ''',
 					 (time.time(), i))
 			continue
 		# If text is empty, update lasttime could not be used and go next proxy
 		if not response.text or 399 < response.status_code < 600:
-			cursor.execute('''UPDATE proxies SET lasttime_could_not_be_used = ? WHERE proxy = ? ''',
+			cursor.execute('''UPDATE proxies SET lasttime_could_not_be_used = %d WHERE proxy = %s ''',
 					 (time.time(), i))
 			continue
 		return response.json()
@@ -62,7 +59,7 @@ def fetch_proxies(connection):
 		url = "http://{}:{}".format(ip_addr, port)
 
 		if(not proxy_is_in_db(url, connection)):
-			cursor.execute("INSERT INTO proxies VALUES(?, 0)", (url,))
+			cursor.execute("INSERT INTO proxies VALUES(%s, 0)", (url,))
 			cnt += 1
 	logging.info("added {} new proxies".format(cnt))
 	connection.commit()
@@ -91,8 +88,8 @@ def _get_rows(soup):
 		
 def proxy_is_in_db(url, connection):
 	cursor = connection.cursor()
-	cursor.execute("SELECT proxy FROM proxies WHERE proxy = ?", (url,))
+	cursor.execute("SELECT proxy FROM proxies WHERE proxy = %s", (url,))
-	return cursor.fetchall() != []
+	return bool(cursor.fetchall())
 
 
 

exam/ex01/receive.py

@@ -4,6 +4,18 @@ from proxy import get_data_with_proxy, NoMoreProxiesException
 
 logger = logging.getLogger(__name__)
 
+def ignore_title(title):
+	ignore_starters = ["Help:"
+			, "Wikipedia:"
+			, "Template:"
+			, "Template_talk:"
+			, "Category:"
+			]
+	for ignore in ignore_starters:
+		if(title.startswith(ignore)):
+			return True
+	return False
+
 def _receive_links(title, connection):
 	url = construct_url(title)
 
@@ -15,14 +27,22 @@ def _receive_links(title, connection):
 			destination_title = page_data["title"].replace(" ", "_")
 			# avoid 1-loops
 			if(destination_title == title):
-				pass
+				continue
-			cursor.execute("INSERT INTO links(source, destination) VALUES(?, ?)", (title, destination_title))
+			if(ignore_title(title)):
+				continue
+			cursor.execute("INSERT INTO links(source, destination) VALUES(%s, %s)", (title, destination_title))
 			yield destination_title
 
 		else:
 			for destination in page_data["links"]:
+				if(ignore_title(title)):
+					continue
 				destination_title = destination["title"].replace(" ", "_")
-				cursor.execute("INSERT INTO links(source, destination) VALUES(?, ?)", (title, destination_title))
+				try:
+					cursor.execute("INSERT INTO links(source, destination) VALUES(%s, %s)", (title, destination_title))
+				except Exception as e:
+					print(destination_title)
+					raise e
 				yield destination_title
 		connection.commit()
 
@@ -36,7 +56,8 @@ def receive_link_graph(title, connection, depth):
 		return
 
 	cursor = connection.cursor()
-	cursor.execute("SELECT COUNT(source) FROM links WHERE source=?", (title,))
+	print(repr(title))
+	cursor.execute("SELECT COUNT(source) FROM links WHERE source=%s", (title,))
 	if(cursor.fetchone()[0] != 0):
 		# we fetched that title already
 		return
@@ -52,7 +73,7 @@ def receive_link_graph(title, connection, depth):
 			# Retry later, so we have to store our list that is still to fetch.
 
 			cursor = connection.cursor() 
-			cursor.execute("INSERT INTO failed_to_fetch(title, depth) VALUES(?, ?)", (link, depth - 1))
+			cursor.execute("INSERT INTO failed_to_fetch(title, depth) VALUES(%s, %d)", (link, depth - 1))
 			connection.commit()