# -*- coding: utf-8 -*-

from __future__ import absolute_import

import json
import logging
import socket
from urllib import urlencode

from tornado import gen, queues
from tornado.ioloop import IOLoop
from tornado.httpclient import AsyncHTTPClient, HTTPRequest, HTTPError

logger = logging.getLogger(__name__)

def fallback(reason=''):
    """Fallback response."""
    return dict(
        status_code=502,
        reason='Bad Gateway',
        headers={
            'Content-Type': 'application/json',
        },
        content=json.dumps({
            'code': 502,
            'message': str(reason) or 'gateway is using fallback mechanism',
            'errors': []
        })
    )

@gen.coroutine
def fetch(request, options=None):
    """Fetch request."""
    client = AsyncHTTPClient()
    options = options or {}
    request = HTTPRequest(
        url='%s?%s' % (request['url'], urlencode(request['params'])),
        method=request['method'].upper(),
        headers=request['headers'],
        body=request['data'] if request['method'].upper() != 'GET' else None,
        connect_timeout=options.get('connect_timeout_seconds'),
        request_timeout=options.get('timeout_seconds'),
    )
    try:
        resp = yield client.fetch(request)
        response = dict(
            status_code=resp.code,
            reason=resp.reason,
            headers=dict(resp.headers),
            content=resp.body,
        )
    except HTTPError as error:
        response = dict(
            status_code=error.code,
            reason=error.response.reason,
            headers=dict(error.response.headers),
            content=resp.response.body,
        )
    raise gen.Return(response)


def on_socket_error(error):
    return fallback('gateway reject due to broken upstream connection.')

def on_queue_full(error):
    return fallback('gateway reject due to too many connections.')

def on_gen_timeout(error):
    return fallback('gateway reject due to timeout')

COMMAND_ERRORS = {
    socket.error: on_socket_error,
    queues.QueueFull: on_queue_full,
    gen.TimeoutError: on_gen_timeout,
}

def handle_client_error(error):
    if isinstance(error, tuple(COMMAND_ERRORS.keys())):
        return COMMAND_ERRORS[error.__class__]
    raise error

@@ -823,30 +823,29 @@
     
+if 
 request
- = HTTPRequest(
+%5B'params'%5D:
 %0A   
@@ -852,17 +852,19 @@
      url
-=
+ = 
 '%25s?%25s' 
@@ -909,18 +909,106 @@
 params'%5D
-))
+, True))%0A    else:%0A        url = request%5B'url'%5D%0A    request = HTTPRequest(%0A        url=url
 ,%0A      
@@ -1712,20 +1712,21 @@
 content=
-resp
+error
 .respons
@@ -2225,60 +2225,86 @@
     
-if isinstance(error, tuple(COMMAND_ERRORS.keys())):%0A
+for error_cls in COMMAND_ERRORS:%0A        if isinstance(error, error_cls):%0A    
     
@@ -2338,19 +2338,20 @@
 rror
-._
 _cl
-ass__%5D
+s%5D(error)
 %0A   

fix urlencode error and resp no reference.