From 2fb17fff59056faa21bb3f473fee16028235ea1f Mon Sep 17 00:00:00 2001
From: Christopher Usher <chrusher@gmail.com>
Date: Fri, 28 Dec 2018 04:18:06 -0800
Subject: [PATCH] much closer to being functional

---
 backfiller/backfiller.py | 101 +++++++++++++++++++++++++++++++--------
 1 file changed, 80 insertions(+), 21 deletions(-)

diff --git a/backfiller/backfiller.py b/backfiller/backfiller.py
index 40773fc..8c4ba7c 100644
--- a/backfiller/backfiller.py
+++ b/backfiller/backfiller.py
@@ -11,6 +11,11 @@ import glob
 import requests
 import os
 
+hour_fmt = '%Y-%m-%dT%H'
+
+def is_localhost(node):
+
+	return None	
 
 def get_nodes():
 
@@ -23,60 +28,114 @@ def get_nodes():
 
 	return nodes
 
-def list_remote_segments(node):
+def list_local_segments(base_dir, stream, variant, hour):
+
+	path = os.path.join(base_dir, stream, variant, hour)
+	return [name for name in os.listdir(path) if not name.startswith('.')]
+
+def get_hours(node, stream, variant):
+
+	resp = requests.get('https://{}/files/{}/{}'.format(node, stream, variant))
+	hours = resp.json()
 
-	# return a list of paths
-	# obviously update path with real one
+	return hours
 
-	resp = requests.get(node + '/wubloader/segment_list')
+def list_remote_segments(node, stream, variant, hour):
+
+	resp = requests.get('https://{}/files/{}/{}/{}'.format(node, stream,
+						variant, hour_str))
 	remote_segments = resp.json() #replace with appropriate parser
 
 	return remote_segments
 
 #based on _get_segment in downloader/main
-#should have a more general shared version of this
-def get_remote_segment(node, segment):
+def get_remote_segment(base_dir, node, stream, variant, hour, missing_segment):
 
-	# obviously update path with real one
-	resp = requests.get(node + '/wubloader/segments/' + segment, stream=True)
+	resp = requests.get('https://{}/segments/{}/{}/{}/{}'.format(node, stream, variant,
+							hour, missing_segment), stream=True)
 
 	with open('temp_backfill', 'w') as f:
 		for chunk in resp.iter_content(8192):
 			f.write(chunk)
 
+	path = os.path.join(base_dir, stream, variant, hour, missing_segment)
 	os.rename(temp, segment)
 
 
 
-def back_fill(base_dir, nodes=None):
+def back_fill(static_folder, stream, variants, hours=None, nodes=None,
+	failure_limit=5):
 
+	# if variants is None, backfill all versions
+	# if hours is None, backfill all hourdirs
+	# if hours is iterable, backfill those hourdirs
+	# if hours is int, backfill last hours hourdirs
+	
 	# loop over nodes asking for a list of segments then downloads any 
 	# segments it doesn't have
 
 	if nodes is None:
 		nodes = get_nodes()
 
+	if isinstance(hours, int):
+		n_hours = hours
+
+		if n_hours < 1:
+			raise ValueError('Number of hours has to be 1 or greater')
+
+		now = datetime.datetime.utcnow()
+		
+		now_str = now.strftime(hour_fmt)
+		now_hour = datetime.strptime(now_str, hour_fmt)
+
+		hours = [now_str]
+
+		for i in range(n_hours - 1):
+
+			previous_hour =  datetime.strptime(hours[-1], hour_fmt)
+			current_hour = previous_hour + datetime.timedelta(hours=-1)
+			hours.append(current_hour.strftime(hour_fmt))
 
 	for node in nodes:
 
-		# need to figure out how to properly check whether this node is
-		# the same
-		if node == 'localhost':
-			continue
+		back_fill_node(static_folder, node, stream, variants, hours,
+			failure_limit)
 
-		# not sure how much we want to hard code the search
-		# replace with something from the restreamer
-		local_segments = set(glob.glob(base_dir + '/*/*/*.ts'))
 
-		remote_segments = set(list_remote_segments(node))
+def back_fill_node(base_dir, node, stream, variants, hours, failure_limit):
 
-		missing_segments = remote_segments - local_segments
+	# need to figure out how to properly check whether this node is the same
+	if is_local_host(node):
+		return
 
-		
-		for missing_segment in missing_segments:
-			get_remote_segment(node, missing_segment)
+	failures = 0
+	for variant in variants:
+
+		if hours is None:
+			node_hours = get_hours(node, stream, variant)
+		else:
+			node_hours = hours
+
+		for hour in node_hours:
+			
+			local_segments = list_local_segments(base_dir, stream, variant,
+								hour)
+			local_segments = set(local_segments)
+			remote_segments = list_remote_segments(node, stream, variant, hour)
+			remote_segments = set(remote_segments)
+			missing_segments = remote_segments - local_segments
+
+			for missing_segment in missing_segments:
+
+				status = get_remote_segment(base_dir, node, stream, variant,
+							hour, missing_segment)
 
+				if not status:
+					failures += 1
 
+				if failures > failure_limit:
+					return
+							
 
 def main(base_dir, wait_time=60):