use os.open and os.write instead of regular file

navigator/scripts/write-chunks.py3

@@ -31,34 +31,33 @@ import os
 import sys
 import json
 
-def write_chunk(chunk, file):
-    if not file:
-        path = sys.argv[1]
-        parent_path = os.path.dirname(path)
-        try:
-            if not os.path.exists(parent_path):
-                os.makedirs(parent_path, exist_ok=True)
-            elif os.path.isfile(parent_path):
-                print(parent_path + ": exists and is not a directory.")
-                sys.exit(1)
-            file = open(path, "wb")
-        except Exception as e:
-            print(e)
-            sys.exit(1)
+def write_chunk(chunk, fd):
 	seek = chunk["seek"]
 	data = base64.b64decode(chunk["chunk"])
+	os.lseek(fd, seek, os.SEEK_SET)
+	os.write(fd, data)
+
+def create_path(path):
 	try:
-        file.seek(seek)
-        file.write(data)
+		if not os.path.exists(path):
+			os.makedirs(path, exist_ok=True)
+		elif os.path.isfile(path):
+			print(path + ": exists and is not a directory.")
+			sys.exit(1)
 	except Exception as e:
 		print(e)
 		sys.exit(1)
 
 def main():
-    file = None
 	if len(sys.argv) != 2:
 		print("Invalid number of arguments.")
 		sys.exit(1)
+	fd = None
+	path = sys.argv[1]
+	parent_path = os.path.dirname(path)
+	create_path(parent_path)
+	try:
+		fd = os.open(sys.argv[1], os.O_WRONLY | os.O_TRUNC | os.O_CREAT)
 		while True:
 			try:
 				json_in = input()
@@ -66,17 +65,13 @@ def main():
 				break
 			json_list = json_in.split("\n") # need to split in case writes happen faster than reads
 			for json_obj in json_list:
-            try:
 				obj_in = json.loads(json_obj)
+				write_chunk(obj_in, fd)
 	except Exception as e:
 		print(e)
-                log = open("/var/log/navigator.log", "w")
-                log.write(json_in)
-                log.close()
+		os.close(fd)
 		sys.exit(1)
-            write_chunk(obj_in, file)
-    if file:
-        file.close()
+	os.close(fd)
 	sys.exit(0)
 
 if __name__ == "__main__":