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import http.server | |
import socketserver | |
import urllib.request | |
import shutil | |
import os | |
import hashlib | |
import sys | |
class CacheHandler(http.server.CGIHTTPRequestHandler): | |
def do_OPTIONS(self): | |
self.send_response(200, "ok") | |
self.send_header('Access-Control-Allow-Origin', '*') | |
self.send_header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS') | |
self.send_header("Access-Control-Allow-Headers", "X-Requested-With") | |
def do_POST(self): | |
m = hashlib.md5() | |
content_len = int(self.headers.get('Content-Length')) | |
post_body = self.rfile.read(content_len) | |
m.update(post_body) | |
cache_filename = m.hexdigest() + ".cached" | |
if not os.path.exists(cache_filename): | |
print("cache miss") | |
with open(cache_filename + ".temp", "wb") as output: | |
req = urllib.request.Request("http://localhost:3000/" + self.path) | |
# copy request headers | |
for k in self.headers: | |
if k not in ["Host"]: | |
req.add_header(k, self.headers[k]) | |
try: | |
resp = urllib.request.urlopen(req, data=post_body) | |
shutil.copyfileobj(resp, output) | |
os.rename(cache_filename + ".temp", cache_filename) | |
except urllib.error.HTTPError as err: | |
self.send_response(err.code) | |
self.end_headers() | |
return | |
else: | |
print("cache hit, reading from " + cache_filename) | |
with open(cache_filename, "rb") as cached: | |
self.send_response(200) | |
self.end_headers() | |
shutil.copyfileobj(cached, self.wfile) | |
socketserver.TCPServer.allow_reuse_address = True | |
with socketserver.TCPServer(("", 8000), CacheHandler) as httpd: | |
print("Starting server at http://localhost:8000") | |
try: | |
httpd.serve_forever() | |
except KeyboardInterrupt: | |
sys.exit(0) |
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