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app.py
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app.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from eventlet import wsgi
import eventlet
import json
import os
import pymysql
import redis
import sys
import uuid
import traceback
import collections
from init import *
# import spawning
from multiprocessing import Process
host = os.getenv("APP_HOST", "localhost")
port = int(os.getenv("APP_PORT", "8080"))
get_order_multiply = None
order_multiply = None
# conn = pymysql.connect(host=os.getenv("DB_HOST", "localhost"),
# port=int(os.getenv("DB_PORT", 3306)),
# user=os.getenv("DB_USER", "root"),
# passwd=os.getenv("DB_PASS", "toor"),
# db=os.getenv("DB_NAME", "eleme"))
invalid_access_token = json.dumps({"code": "INVALID_ACCESS_TOKEN","message": u"无效的令牌"})
empty_request = json.dumps({"code" : "EMPTY_REQUEST", "message": u"请求体为空"})
malformed_json = json.dumps({"code": "MALFORMED_JSON","message": u"格式错误"})
cart_not_found = json.dumps({"code": "CART_NOT_FOUND","message": u"篮子不存在"})
not_authorized_to_access_cart = json.dumps({"code": "NOT_AUTHORIZED_TO_ACCESS_CART","message": u"无权限访问指定的篮子"})
food_out_of_limit = json.dumps({"code": "FOOD_OUT_OF_LIMIT","message": u"篮子中食物数量超过了三个"})
food_not_found = json.dumps({"code": "FOOD_NOT_FOUND","message": u"食物不存在"})
food_out_of_stock = json.dumps({"code": "FOOD_OUT_OF_STOCK","message": u"食物库存不足"})
not_authorized_to_access_cart = json.dumps({"code": "NOT_AUTHORIZED_TO_ACCESS_CART","message": u"无权限访问指定的订单"})
order_out_of_limit = json.dumps({"code": "ORDER_OUT_OF_LIMIT","message": u"每个用户只能下一单"})
empty_order = json.dumps([])
def access_token_verify(env):
try :
access_token = env['QUERY_STRING'].split('=')[1]
except Exception, e:
try:
access_token = env['HTTP_ACCESS_TOKEN']
except Exception, e:
return ('401', [('Content-Type', 'text/plain')], invalid_access_token)
try:
if access_token == None or len(access_token) == 0:
return ('401', [('Content-Type', 'text/plain')], invalid_access_token)
except Exception, e:
info = sys.exc_info()
print info[0],":",info[1]
print traceback.format_exc()
return (access_token,)
def body_verify(env):
msg = env['eventlet.input'].read(env['CONTENT_LENGTH'])
if len(msg) == 0:
return ('400', [('Content-Type', 'text/plain')], empty_request)
try:
msg = json.loads(msg)
return (msg, )
except Exception, e:
return ('400', [('Content-Type', 'text/plain')], malformed_json)
def order_verify(access_token):
order = local_db["orders"].get(access_token)
if order:
return order
else:
order = redis_connectionpool.hexists("orders", access_token + ":cart_id")
local_db["orders"][access_token] = order
return order
# def set_o
def set_user_token(username):
global local_db
users = local_db["users"]
access_token = users[username].get("access_token")
if not access_token:
access_token = uuid.uuid4().hex
id = users[username]["id"]
redis_connectionpool.hset("users", access_token, id)
local_db["access_token"][access_token] = username
return access_token
def get_userid_by_token(access_token):
id = redis_connectionpool.hget("users", access_token)
return id
def login(env, start_response):
res = body_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
msgLogin = res[0]
try:
username = msgLogin['username']
users = local_db["users"]
if not users[username]:
return "USER_AUTH_FAIL"
else:
if not users.get(username) or users[username]['password'] == msgLogin['password']:
id = users[username]["id"]
access_token = set_user_token(username)
start_response('200', [('Content-Type', 'text/plain')])
return json.dumps({'user_id': users[username]["id"], 'username':username, 'access_token':access_token})
else:
start_response('403', [('Content-Type', 'text/plain')])
return json.dumps({"code": "USER_AUTH_FAIL","message": u"用户名或密码错误"})
except Exception, e:
info = sys.exc_info()
print info[0],":",info[1]
print traceback.format_exc()
def foods(env, start_response):
res = access_token_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
start_response('200', [('Content-Type', 'text/plain')])
return foodList
def add_cart(access_token):
cart_id = uuid.uuid4().hex
# cart = json.dumps({'user_id': local_db["users"][local_db["access_token"][access_token]]["id"], 'food_info':{}, 'total':0})
# cart = {'access_token': access_token, 'food_info':{}, 'total':0}
cart = {'access_token': access_token, 'total':0}
cart_key = "carts:" + cart_id
redis_connectionpool.hmset(cart_key, cart)
local_db[cart_key] = cart
return cart_id
def get_cart(cart_id):
global local_db
cart_key = "carts:" + cart_id
cart = local_db.get(cart_key)
if not cart:
cart = redis_connectionpool.hgetall(cart_key)
local_db[cart_key] = cart
return cart
def carts(env, start_response):
res = access_token_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
access_token = res[0]
cart_id = add_cart(access_token)
d = {'cart_id': cart_id}
start_response('200', [('Content-Type', 'text/plain')])
return json.dumps(d)
def user_verify(access_token, id):
pass
def db_add_food(cart_id, food_id, count):
pipe = redis_connectionpool.pipeline()
pipe.hincrby("carts:foods:"+cart_id, food_id, count).hincrby("carts:"+cart_id, 'total', count).execute()
def add_food(env, start_response):
global local_db
res = body_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
msgPatch = res[0]
res = access_token_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
access_token = res[0]
cart_id = env['PATH_INFO'].split('/')[2]
food_id = msgPatch['food_id']
count = msgPatch['count']
cart = get_cart(cart_id)
if cart:
if cart['access_token'] == access_token:
foodNum = count
if foodNum + int(cart['total']) > 3:
start_response('403', [('Content-Type', 'text/plain')])
return food_out_of_limit
global food_id_set
if not food_id in food_id_set:
start_response('404', [('Content-Type', 'text/plain')])
return food_not_found
db_add_food(cart_id, food_id, count)
start_response('204', [('Content-Type', 'text/plain')])
return json.dumps({})
else:
start_response('403', [('Content-Type', 'text/plain')])
return not_authorized_to_access_cart
else:
start_response('404', [('Content-Type', 'text/plain')])
return cart_not_found
def get_order(env, start_response):
res = access_token_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
access_token = res[0]
order = order_verify(access_token)
# if r_id_acc.exists(access_token):
# myId = str(json.loads(r_id_acc[access_token]))
if order:
get_order_lua = """
local access_token = KEYS[1]
local cart_id = redis.call("HGET", "orders", access_token .. ":cart_id")
local id = redis.call("HGET", "orders", access_token .. ":id")
local items = {}
local foods_kv = redis.call("HGETALL", "carts:foods:"..cart_id)
local total = 0
local i = 1
local food, count
for idx = 1, #foods_kv, 2 do
food = foods_kv[idx]
count = tonumber(foods_kv[idx + 1])
items[i] = {food_id = tonumber(food), count = count}
i = i+ 1
total = total + tonumber(redis.call("HGET", "food:".. food, "price")) * count
end
local result = {id = id, user_id = id, items = items, total = total}
return cjson.encode({result});
"""
global get_order_multiply
if not get_order_multiply:
get_order_multiply = redis_connectionpool.register_script(get_order_lua)
start_response('200', [('Content-Type', 'text/plain')])
return get_order_multiply(keys=[access_token], args=[])
# myOrder = json.loads(r_orders[myId])
# items=[]
# for food_id in myOrder:
# if food_id=='_zhs_total_':
# total = myOrder[food_id]
# else:
# d = collections.OrderedDict()
# d['food_id']=int(food_id)
# d['count']=myOrder[food_id]
# items.append(d)
# reOrder = collections.OrderedDict()
# reOrder['id'] = myId
# reOrder['items'] = items
# reOrder['total'] = total
# start_response('200', [('Content-Type', 'text/plain')])
#return json.dumps([reOrder])
# else:
# start_response('401', [('Content-Type', 'text/plain')])
# return not_authorized_to_access_cart
else:
start_response('200', [('Content-Type', 'text/plain')])
return empty_order
def order(env, start_response):
res = body_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
else:
msgOrder = res[0]
res = access_token_verify(env)
if len(res) > 1:
http_code, content_type, msg = res
start_response(http_code, content_type)
return msg
access_token = res[0]
cart_id = msgOrder['cart_id']
cart = get_cart(cart_id)
if cart:
if cart['access_token'] == access_token:
if order_verify(access_token):
start_response('403', [('Content-Type', 'text/plain')])
return order_out_of_limit
else:
# d = cart['food_info']
# if not d:
# start_response('403', [('Content-Type', 'text/plain')])
# return food_out_of_stock
# stock={}
# price={}
# pipe = r_food.pipeline()
# while 1:
# try:
# for food_id in d:
# pipe.watch(food_id)
# r_food_get = json.loads(r_food[food_id])
# stock[food_id], price[food_id] = r_food_get
# if stock[food_id] < d[food_id]:
# start_response('403', [('Content-Type', 'text/plain')])
# return food_out_of_stock
# pipe.multi()
# for food_id in d:
# r_food_get=[0,0]
# stock[food_id]-=d[food_id]
# r_food_get[0] = stock[food_id]
# r_food_get[1] = price[food_id]
# pipe.set(food_id,json.dumps(r_food_get))
# pipe.execute()
# break
# except redis.WatchError:
# continue
# finally:
# pipe.reset()
order_lua = """
local cart_id = KEYS[1]
local foods_kv = redis.call("HGETALL", "carts:foods:"..cart_id)
local foods = {}
local food
local count = 0
for idx = 1, #foods_kv, 2 do
food = foods_kv[idx]
count = tonumber(foods_kv[idx + 1])
foods[food] = count
if count > tonumber(redis.call("HGET", "food:".. food, "stock")) then
return nil
end
end
for f, c in pairs(foods) do
redis.call("HINCRBY", "food:" .. f, "stock", -c)
end
return 1
"""
if not order_multiply:
multiply = redis_connectionpool.register_script(order_lua)
result = multiply(keys=[cart_id], args=[])
if not result:
start_response('403', [('Content-Type', 'text/plain')])
return food_out_of_stock
id = get_userid_by_token(access_token)
redis_connectionpool.hmset("orders", {access_token+":cart_id": cart_id, access_token+":id": id})
start_response('200', [('Content-Type', 'text/plain')])
return json.dumps({"id": id})
else:
start_response('403', [('Content-Type', 'text/plain')])
return not_authorized_to_access_cart
else:
start_response('404', [('Content-Type', 'text/plain')])
return cart_not_found
def root(env, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Welcome!\r\n']
def error(env, start_response):
start_response('404 Not Found', [('Content-Type', 'text/plain')])
return ['Not Found\r\n']
methods = {'': root,
'loginPOST': login,
'foodsGET': foods,
'cartsPOST': carts,
'cartsPATCH': add_food,
'ordersGET': get_order,
'ordersPOST': order}
def app(env, start_response):
method = methods.get(env['PATH_INFO'].split("/")[1] + env['REQUEST_METHOD'], error)
return method(env, start_response)
if __name__ == '__main__':
eventlet.patcher.monkey_patch(all=False, socket=True, time=True,
select=True, thread=True, os=True)
# wsgi.server.log_message = lambda self,message:None
wsgi.server(eventlet.listen((host, port)), app, log = None, max_size = 2000, log_output = False)
# eventlet_listen = eventlet.listen((host, port))
# pool = multiprocessing.Pool(processes=4)
# for i in xranges(4):
# pool.apply_async(wsgi.server, (eventlet_listen, app, log = None, max_size = 2000, log_output = False))
# pool.apply_async(wsgi.server, (eventlet_listen, app))
# pool.close()
# pool.join()