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Copy pathhandle.py
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217 lines (159 loc) · 5.89 KB
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# -*- coding: utf-8 -*-
import selectors
from operator import eq
from http_handler import HTTPStatus
from http_handler.urls import router
from logger import Logger
from parser.parser import ParserHttp
from utils import args_to_str, string_to_byte
from utils.decorator.memoization import LRU
LOG = Logger().log
responses_code = {
v.value: (v.phrase, v.description) for v in HTTPStatus.__members__.values()
}
__all__ = (
'Handle',
'RequestHandler',
'ResponseHandler'
)
default_headers = [('Accept-Charset', 'utf-8')]
class ServerError(Exception):
__slots__ = ['msg']
def __init__(self, msg='server error'):
self.msg = msg
def __str__(self):
return self.msg
# TODO 상황별 http code 로직 추가
class Handle:
__slots__ = ["selector", "sock", "addr", "_recv_buffer", "_send_buffer", "_json_header_len", "request"]
def __init__(self, selector, sock, addr):
self.selector = selector
self.sock = sock
self.addr = addr
self._recv_buffer = b""
self._send_buffer = b""
self._json_header_len = None
self.request = None
def process_events(self, mask):
if mask & selectors.EVENT_READ:
self.read()
if mask & selectors.EVENT_WRITE:
self.write()
def read(self):
self._read()
if self._recv_buffer:
req_line, request_headers = ParserHttp()(self._recv_buffer)
self.request = RequestHandler(req_line, request_headers)
LOG.info(self.request)
# only HTTP or 1.0 이하는 에러
if self.request is None or not self.request.protocol.startswith("HTTP/") or \
self.request.version < ('1', '0'):
self.send_error(self.request.protocol, 400, default_headers)
# TODO body 확인
def _read(self):
try:
data = self.sock.recv(4096)
except BlockingIOError:
pass
else:
if data:
self._recv_buffer += data
else:
raise RuntimeError("Peer closed.")
def write(self):
if not self.request or not self.request.method or not self.request.url:
return
try:
self.request.handler = router.lookup(self.request.method, self.request.url)
self._write(self.request)
except Exception as e:
LOG.error(repr(e))
raise ServerError
def _write(self, request):
if not self._recv_buffer:
self.send_error(self.request, 400)
elif eq(request.handler, (None, None)):
self.send_error(self.request, 404)
else:
try:
ret_data = self.get_response_data(request)
response_data = ResponseHandler(request, 200, ret_data)()
LOG.info(response_data)
self.send(response_data)
except Exception as e:
LOG.error(repr(e))
self.send_error(self.request, 400)
self.close()
@LRU()
def get_response_data(self, request):
ret_data = ''
api_handler, params = request.handler
if api_handler is None:
return ret_data
ret_data = api_handler(request)
if ret_data is None:
raise ServerError
return ret_data
def send(self, send_data):
try:
self.sock.send(string_to_byte(send_data))
except BlockingIOError:
pass
except Exception as e:
LOG.error(repr(e))
def send_error(self, request, code):
res_data = ResponseHandler(request, code, '')()
self.send(res_data)
self.request = None
def close(self):
LOG.info(args_to_str("closing connection to", self.addr))
try:
self.selector.unregister(self.sock)
except Exception as e:
LOG.error(repr(e))
try:
self.sock.close()
except OSError as e:
LOG.error(repr(e))
finally:
self.sock = None
class RequestHandler:
__slots__ = ["method", "url", "protocol", "version", "params", "headers", "body", "handler", "content_type"]
def __init__(self, request_line, request_headers):
self.method = request_line['method']
self.url = request_line['url']
self.protocol = request_line['protocol']
self.version = request_line['version']
self.params = request_line['params']
self.headers = request_headers
self.body = None
self.handler = None
self.content_type = request_line['content_type']
def __repr__(self):
return "{} {} {} {}".format(self.__class__, self.method, self.url, self.params)
class ResponseHandler:
__slots__ = ["code", "message", "protocol", "headers_buffer", "body"]
def __init__(self, request, code, body):
self.code = code
self.message = responses_code[code][0]
self.protocol = request.protocol
self.body = '' if body is None else body
self.headers_buffer = self.set_headers(("content-type", request.content_type))
self.headers_buffer.append("\r\n")
def __call__(self, *args, **kwargs) -> str:
_wfile = "{} {} {}".format(self.protocol, self.code, self.message)
_wfile += "\r\n"
_wfile += "".join(self.headers_buffer)
if len(self.body) > 0:
_wfile += "{}\r\n".format(self.body)
return _wfile
def set_headers(self, content_type) -> list:
headers_buffer = []
for keyword, value in default_headers:
headers_buffer.append(("{}: {}\r\n".format(keyword, value)))
key, val = content_type
headers_buffer.append("{}: {}\r\n".format(key, val))
headers_buffer.append("{}: {}\r\n".format('Accept-Ranges', 'bytes'))
content_len = len(self.body)
headers_buffer.append("{}: {}\r\n".format('Content-Length', content_len))
return headers_buffer