利用原生Serverless与Flask框架开发一个博客系统
随着Serverless架构越来越火热，其按量付费，弹性伸缩等很多优质特性都让人眼前一亮，不得惊叹云计算为我们带来的便利。但是就目前而言，Serverless架构相关的业务框架还是比较少的。虽然腾讯云Serverless与Serverless Framework联手，支持了Express、Koa、Egg以及Flask等众多项目的轻松上云，但是在实际使用过程中，尤其是迁移过程中还是很痛苦的。而且，从这些框架在Serverless组件上的表现来看，POST/GET的参数传输方法就比较难原生获取，这可能导致原有项目上云要经历很大的演进过程。
不仅是原生框架直接部署在Serverless架构上会有困难，直接在Serverless架构上开发的框架也很少。所以，本文希望通过一个简单的博客系统开发实践，让大家体验一个基于Serverless架构的系统应该是什么样子。
开发前的思考
思考
- 博客系统需要哪些功能？
这个博客系统仅作为抛砖引玉项目，所以功能比较少，只有两个页面，具有文章管理、分类管理、标签管理以及留言管理等功能，但是为了方便用户管理，要有前台和后台两部分。
- 前台如何做？
前台的用户流量可能会比较大（相对后台而言），所以这部分使用单独的函数，每个功能一个函数，初步判断前台需要的函数包括：获取文章分类、获取文章列表、获取评论列表、增加评论、获取标签列表等接口。
- 后台如何做？
理论上来说，后台是管理员的专属地盘，所以这部分流量比较小，可以通过flask-admin放入到一个函数中来解决。
- 为什么前台要那么多函数，后台用一个框架？
整个项目就用一个框架不好吗？首先要申明，整个项目用一个框架是可以的，但是并不好，例如这个项目的后台使用的是Flask框架，用了Flask-admin来做后台管理，开发过程可能很简单，一百行代码就可以搞定，但是这样会引发其中问题。
网页的返回，需要APIGW开启响应集成，响应集成的性能其实很差，所以相对来说，不太适合放在前端。
一个完整的项目比较大，需要的资源也会更多，那么就需要分配给这个函数更多的资源内存，会导致收费的增加。例如后台给的资源是1024，前端每个函数给的内存资源是128/256，在执行同样时间的时候，明显后者的费用降低了4-8倍。同样，函数会涉及到冷启动，冷启动一个函数和冷启动函数中的一个完整的框架/项目，前者的速度和性能会更好。
函数都有并发上限，如果所有资源全都请求到一个函数，那么就会出现实际用户并发几个的时候，对应的函数并发就已经是达到几十上百。在用户稍微多一点的情况下，就会触及用户实例的上限限制。后台功能是非频繁功能，前台相对来说是更频繁的，所以前台使用单独接口更合理。
- 登陆功能怎么做？
函数并不像传统开发可以将客户的登录信息缓存到机器上，但是客户端依旧可以使用cookie，所以利用这个方法，可以做以下流程：
1、后台登录入口处，拉取APIGW传过来的APIGW Event，看其中headers/cookie是否存在，不存在就会返回登录页面
2、如果headers/cookie存在，取cookie中的Token字段，判断Token字段是否和服务端的Token字段吻合，吻合进入系统后台，不吻合返回登录页面
3、用户登录，请求后台的登陆功能，如果账号密码正确，则返回给用户一个Token，客户端将Token记录到cookie中。
看完这个流程，大家可能又会有一些问题：
Token是什么？
Token可以认为是一个登录凭证，生成方法可以按照自己设计升级，本实践比较简单，就直接用账号密码组合，然后md5。
Token存在那里？下次如何获取？
Token可以存在MySQL数据库中，也可以存在Redis中，甚至可以存在COS中。Redis和COS都可以利用其自身特性做一些额外的操作，例如数据有效期（用来做登录过期等）。本文实践比较简单，所以每次用户请求过来都是单独计算Token，然后进行对比。
这种Token登陆方法可以用于其他项目吗？
当然可以用于其他项目，例如我自己的Anycodes也是通过Token进行鉴权。不过，在Serverless架构下Token如何存储是一个问题，我个人的建议是有钱就用Redis，没钱就用COS，不想额外花钱就像我，每次是用单独对比。
Token存储在Redis可以理解，但是存在COS是为什么？
COS本身是对象存储，用来存储文件的，所以存储Token是完全没有问题的。如果我们每次生成一个新的Token，就把这个Token设置为一个文件，文件内容就是Token对应的用户信息、权限信息或者其他信息，然后存储桶策略设置成文件过期时间，例如文件存入1天自动删除。当用户Token到达时，直接通过内网请求COS（没有流量费）获取指定文件名，如果获取到了就下载回来，然后进行其他操作，不存在就证明用户已过期或者Token错误，提示用户重新登录。当然，这种方法可能不是最优解，但是在Serverless条件下的一个有趣做法，可以在小项目中尝试使用。
- 项目本地开发如何进行调试？
众所周知，Serverless架构的本地调试很难。确实如此，虽说本地调试很困难，但也不是完全不能做的，可以根据项目的需求来做调试策略。
项目开发
数据库设计
由于这是一个简单的博客，所以数据库的设计也相对比较简单，只有文章表、分类表、标签表、评论表等，整体的ER图如下所示：
项目开发
项目开发过程主要是数据库的增删改查，为了适应Serverless架构下的项目开发、提高项目的开发效率，这里总结了一些相关的开发技巧和经验：
本地开发与调试
针对开发调试，我们在每个函数后都增加了对应触发器的调试方案，例如APIGW触发器。
增加代码：
def test():
event = {
"requestContext": {
"serviceId": "service-f94sy04v",
"path": "/test/{path}",
"httpMethod": "POST",
"requestId": "c6af9ac6-7b61-11e6-9a41-93e8deadbeef",
"identity": {
"secretId": "abdcdxxxxxxxsdfs"
},
"sourceIp": "14.17.22.34",
"stage": "release"
},
"headers": {
"Accept-Language": "en-US,en,cn",
"Accept": "text/html,application/xml,application/json",
"Host": "service-3ei3tii4-251000691.ap-guangzhou.apigateway.myqloud.com",
"User-Agent": "User Agent String"
},
"body": json.dumps({"id": 1}),
.... ....
}
print(main_handler(event, None))
if __name__ == "__main__":
test()如果想看运行效果，可以执行以下文件：
{'id': 1, 'title': '', 'watched': 1, 'category': '热点新闻', 'publish': '2020-02-13 00:45:52', 'tags': [], 'next': {}, 'pre': {}}
{'uuid': '749ca9f6-4dfb-11ea-9c5b-acde48001122', 'error': False, 'message': ''}接下来，我们可以在本地模拟线上环境。下面的这个做法可以用于绝大部分函数，但如果遇到需要内网资源的函数，这个做法可能就比较麻烦。
后台的Flaks框架部分：
def test():
event = {'body': 'name=sdsadasdsadasd&remark=', 'headerParameters': {}, 'headers': {
'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'accept-encoding': 'gzip, deflate', 'accept-language': 'zh-CN,zh;q=0.9', 'cache-control': 'no-cache',
'connection': 'keep-alive', 'content-length': '27', 'content-type': 'application/x-www-form-urlencoded',
'cookie': 'Hm_lvt_a0c900918361b31d762d9cf4dc81ee5b=1574491278,1575257377', 'endpoint-timeout': '15',
'host': 'blog.0duzhan.com', 'origin': 'http://blog.0duzhan.com', 'pragma': 'no-cache',
'proxy-connection': 'keep-alive', 'referer': 'http://blog.0duzhan.com/admin/tag/new/?url=%2Fadmin%2Ftag%2F',
'upgrade-insecure-requests': '1',
'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36',
'x-anonymous-consumer': 'true', 'x-api-requestid': '656622f3b008a0d406a376809b03b52c',
'x-b3-traceid': '656622f3b008a0d406a376809b03b52c', 'x-qualifier': '$LATEST'}, 'httpMethod': 'POST',
'path': '/admin/tag/new/', 'pathParameters': {}, 'queryString': {'url': '/admin/tag/'},
'queryStringParameters': {},
'requestContext': {'httpMethod': 'ANY', 'identity': {}, 'path': '/admin', 'serviceId': 'service-23ybmuq7',
'sourceIp': '119.123.224.87', 'stage': 'release'}}
print(main_handler(event, None))
if __name__ == "__main__":
test()index执行结果：
{'body': 'name=sdsadasdsadasd&remark=', 'headerParameters': {}, 'headers': {'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9', 'accept-encoding': 'gzip, deflate', 'accept-language': 'zh-CN,zh;q=0.9', 'cache-control': 'no-cache', 'connection': 'keep-alive', 'content-length': '27', 'content-type': 'application/x-www-form-urlencoded', 'cookie': 'Hm_lvt_a0c900918361b31d762d9cf4dc81ee5b=1574491278,1575257377', 'endpoint-timeout': '15', 'host': 'blog.0duzhan.com', 'origin': 'http://blog.0duzhan.com', 'pragma': 'no-cache', 'proxy-connection': 'keep-alive', 'referer': 'http://blog.0duzhan.com/admin/tag/new/?url=%2Fadmin%2Ftag%2F', 'upgrade-insecure-requests': '1', 'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36', 'x-anonymous-consumer': 'true', 'x-api-requestid': '656622f3b008a0d406a376809b03b52c', 'x-b3-traceid': '656622f3b008a0d406a376809b03b52c', 'x-qualifier': '$LATEST'}, 'httpMethod': 'POST', 'path': '/admin/tag/new/', 'pathParameters': {}, 'queryString': {'url': '/admin/tag/'}, 'queryStringParameters': {}, 'requestContext': {'httpMethod': 'ANY', 'identity': {}, 'path': '/admin', 'serviceId': 'service-23ybmuq7', 'sourceIp': '119.123.224.87', 'stage': 'release'}}
{'isBase64Encoded': False, 'statusCode': 200, 'headers': {'Content-Type': 'text/html'}, 'body': '<!DOCTYPE html>\n<html lang="en">\n<head>\n <meta charset="UTF-8">\n <title>Title</title>\n <script>\n var url = window.location.href\n url = url.split("admin")[0] + "admin"\n String.prototype.endWith = function (s) {\n var d = this.length - s.length;\n return (d >= 0 && this.lastIndexOf(s) == d)\n }\n if (window.location.href != url) {\n if (!window.location.href.endsWith("admin") || !window.location.href.endsWith("admin/"))\n window.location = url\n }\n\n function doLogin() {\n var xmlhttp = window.XMLHttpRequest ? (new XMLHttpRequest()) : (new ActiveXObject("Microsoft.XMLHTTP"))\n xmlhttp.onreadystatechange = function () {\n if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {\n if (JSON.parse(xmlhttp.responseText)["Token"]) {\n document.cookie = "Token=" + JSON.parse(xmlhttp.responseText)["Token"];\n window.location = `http://${window.location.host}/admin`\n } else {\n alert(JSON.parse(xmlhttp.responseText)["message"])\n }\n }\n }\n xmlhttp.open("POST", window.location.pathname, true);\n xmlhttp.setRequestHeader("Content-type", "application/json");\n xmlhttp.send(JSON.stringify({\n "username": document.getElementById("username").value,\n "password": document.getElementById("password").value,\n }));\n }\n </script>\n</head>\n<body>\n\n<center><h1>Serverless Blog 后台管理</h1>\n 管理账号：<input type="text" id="username"><br>\n 管理密码：<input type="password" id="password"><br>\n <input type="reset"><input type="submit" onclick="doLogin()"><br>\n</center>\n</body>\n</html>'}Flask部署
将Flask部署到Serverless架构可以使用@serverless/tencent-flask实现。不过，为了让大家能够更深入了解传统框架是如何部署到Serverless架构，本文选择了自行’造轮子’实现。
通常情况下，我们使用Flask等框架是需要通过web_server来进入到下一个环节。但云函数更多的是一个函数，本不需要启动web server，所以可以直接调用wsgi_app方法，其中environ就是对event/context等进行处理后的对象，start_response可以认为是一种特殊的数据结构，例如response结构形态等。
如果不使用腾讯云flask-component，我们可以这样实现：
# -*- coding: utf-8 -*-
# Copyright 2016 Matt Martz
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sys
import json
try:
from urllib import urlencode
except ImportError:
from urllib.parse import urlencode
from flask import Flask
try:
from cStringIO import StringIO
except ImportError:
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
from werkzeug.wrappers import BaseRequest
__version__ = '0.0.4'
def make_environ(event):
environ = {}
for hdr_name, hdr_value in event['headers'].items():
hdr_name = hdr_name.replace('-', '_').upper()
if hdr_name in ['CONTENT_TYPE', 'CONTENT_LENGTH']:
environ[hdr_name] = hdr_value
continue
http_hdr_name = 'HTTP_%s' % hdr_name
environ[http_hdr_name] = hdr_value
apigateway_qs = event['queryStringParameters']
request_qs = event['queryString']
qs = apigateway_qs.copy()
qs.update(request_qs)
body = ''
if 'body' in event:
body = event['body']
environ['REQUEST_METHOD'] = event['httpMethod']
environ['PATH_INFO'] = event['path']
environ['QUERY_STRING'] = urlencode(qs) if qs else ''
environ['REMOTE_ADDR'] = 80
environ['HOST'] = event['headers']['host']
environ['SCRIPT_NAME'] = ''
environ['SERVER_PORT'] = 80
environ['SERVER_PROTOCOL'] = 'HTTP/1.1'
environ['CONTENT_LENGTH'] = str(len(body))
environ['wsgi.url_scheme'] = ''
environ['wsgi.input'] = StringIO(body)
environ['wsgi.version'] = (1, 0)
environ['wsgi.errors'] = sys.stderr
environ['wsgi.multithread'] = False
environ['wsgi.run_once'] = True
environ['wsgi.multiprocess'] = False
BaseRequest(environ)
return environ
class LambdaResponse(object):
def __init__(self):
self.status = None
self.response_headers = None
def start_response(self, status, response_headers, exc_info=None):
self.status = int(status[:3])
self.response_headers = dict(response_headers)
class FlaskLambda(Flask):
def __call__(self, event, context):
if 'httpMethod' not in event:
print('httpMethod not in event')
# In this "context" `event` is `environ` and
# `context` is `start_response`, meaning the request didn't
# occur via API Gateway and Lambda
return super(FlaskLambda, self).__call__(event, context)
response = LambdaResponse()
# print response.start_response
body = next(self.wsgi_app(
make_environ(event),
response.start_response
))
# return {
# "isBase64Encoded": False,
# "statusCode": 200,
# "headers": {'Content-Type': 'text/html'},
# "body": body
# }
return {
'statusCode': response.status,
'headers': response.response_headers,
'body': body
}以上代码实现的是将APIGW请求转变成请求集成的形式，传送给Flask框架，用户可以通过request.form来获取post内容，通过request.args获取get内容等。
全局变量
全局变量可能包括用户账号、密码、云的密钥信息、数据库信息等。为了统一配置和修改，这里使用了自己写的全局变量组件：
# 函数们的整体配置信息
Conf:
component: "serverless-global"
inputs:
region: ap-shanghai
runtime: Python3.6
handler: index.main_handler
include_common: ./common
blog_user: Dfounder
blog_email: service@anycodes.cn
blog_about_me: 这就是我的博客
blog_host: blog.0duzhan.com
website_title: Serverless Blog System
website_keywords: Serverless, Serverless Framework, Tencent Cloud, SCF
website_description: 一款基于腾讯云Serverless架构，并且采用Serverless Framework构建的Serverless博客系统。
website_bucket: serverless-blog-1256773370
mysql_host:
mysql_user: root
mysql_password:
mysql_port: 60510
mysql_db: serverless_blog_system
admin_user: mytest
admin_password: mytestabc
tencent_secret_id:
tencent_secret_key:
tencent_appid: 有些函数可以直接使用：
Blog_Web_addComment:
component: "@serverless/tencent-scf"
inputs:
name: Blog_Web_addComment
description: 添加评论
codeUri: ./cloudFunctions/addComment
handler: ${Conf.handler}
runtime: ${Conf.runtime}
region: ${Conf.region}
include:
- ${Conf.include_common}
environment:
variables:
mysql_host: ${Conf.mysql_host}
mysql_port: ${Conf.mysql_port}
mysql_user: ${Conf.mysql_user}
mysql_password: ${Conf.mysql_password}
mysql_db: ${Conf.mysql_db}让项目初始化更容易
为了让项目更容易初始化，例如修改网站名字、描述、关键词、建立数据库等，我单独做了一个init文件：
# -*- coding: utf8 -*-
import pymysql
import shutil
import yaml
import os
def setEnv():
try:
file = open("./serverless.yaml", 'r', encoding="utf-8")
file_data = file.read()
file.close()
data = yaml.load(file_data)
for eveKey, eveValue in data['Conf']['inputs'].items():
os.environ[eveKey] = str(eveValue)
return True
except Exception as e:
raise e
def initDb():
try:
conn = pymysql.connect(host=os.environ.get('mysql_host'),
user=os.environ.get('mysql_user'),
password=os.environ.get('mysql_password'),
port=int(os.environ.get('mysql_port')),
charset='utf8')
cursor = conn.cursor()
sql = "CREATE DATABASE IF NOT EXISTS {db_name}".format(db_name=os.environ.get('mysql_db'))
cursor.execute(sql)
cursor.close()
conn.close()
return True
except Exception as e:
raise e
def initTable():
try:
conn = pymysql.connect(host=os.environ.get('mysql_host'),
user=os.environ.get('mysql_user'),
password=os.environ.get('mysql_password'),
port=int(os.environ.get('mysql_port')),
db=os.environ.get('mysql_db'),
charset='utf8',
cursorclass=pymysql.cursors.DictCursor,
autocommit=1)
cursor = conn.cursor()
createTags = "CREATE TABLE `tags` ( `tid` INT NOT NULL AUTO_INCREMENT , `name` VARCHAR(255) NOT NULL , `remark` TEXT NULL , PRIMARY KEY (`tid`), UNIQUE (`name`)) ENGINE = InnoDB;"
createCategory = "CREATE TABLE `category` ( `cid` INT NOT NULL AUTO_INCREMENT , `name` VARCHAR(255) NOT NULL , `sorted` INT NOT NULL DEFAULT '1' , `remark` TEXT NULL , PRIMARY KEY (`cid`), UNIQUE (`name`)) ENGINE = InnoDB;"
createComments = "CREATE TABLE `comments` ( `cid` INT NOT NULL AUTO_INCREMENT , `content` TEXT NOT NULL , `publish` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , `user` VARCHAR(255) NOT NULL , `email` VARCHAR(255) NULL , `photo` INT NOT NULL DEFAULT '0' , `article` INT NOT NULL , `remark` TEXT NULL , `uni_mark` VARCHAR(255) NOT NULL , `is_show` INT NOT NULL DEFAULT '0' , PRIMARY KEY (`cid`), UNIQUE (`uni_mark`)) ENGINE = InnoDB;"
createArticle = "CREATE TABLE `article` ( `aid` INT NOT NULL AUTO_INCREMENT , `title` VARCHAR(255) NOT NULL , `content` TEXT NOT NULL , `description` TEXT NOT NULL , `publish` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP , `watched` INT NOT NULL DEFAULT '0' , `category` INT NOT NULL , `remark` TEXT NULL , PRIMARY KEY (`aid`)) ENGINE = InnoDB;"
createArticleTags = "CREATE TABLE `article_tags` ( `atid` INT NOT NULL AUTO_INCREMENT , `aid` INT NOT NULL , `tid` INT NOT NULL , PRIMARY KEY (`atid`)) ENGINE = InnoDB;"
alertArticleTagsArticle = "ALTER TABLE `article_tags` ADD CONSTRAINT `article` FOREIGN KEY (`aid`) REFERENCES `article`(`aid`) ON DELETE CASCADE ON UPDATE CASCADE; "
alertArticleTagsTags = "ALTER TABLE `article_tags` ADD CONSTRAINT `tags` FOREIGN KEY (`tid`) REFERENCES `tags`(`tid`) ON DELETE CASCADE ON UPDATE CASCADE;"
alertArticleCategory = "ALTER TABLE `article` ADD CONSTRAINT `category` FOREIGN KEY (`category`) REFERENCES `category`(`cid`) ON DELETE CASCADE ON UPDATE CASCADE;"
alertCommentsArticle = "ALTER TABLE `comments` ADD CONSTRAINT `article_comments` FOREIGN KEY (`article`) REFERENCES `article`(`aid`) ON DELETE CASCADE ON UPDATE CASCADE;"
cursor.execute(createTags)
cursor.execute(createCategory)
cursor.execute(createComments)
cursor.execute(createArticle)
cursor.execute(createArticleTags)
cursor.execute(alertArticleTagsArticle)
cursor.execute(alertArticleTagsTags)
cursor.execute(alertArticleCategory)
cursor.execute(alertCommentsArticle)
cursor.close()
conn.close()
return True
except Exception as e:
raise e
def initHTML():
try:
tempPath = "website"
tempDist = os.path.join(tempPath, "dist")
if os.path.exists(tempDist):
shutil.rmtree(tempDist)
tempFileList = []
for eve in os.walk(tempPath):
if eve[2]:
for eveFile in eve[2]:
tempFileList.append(os.path.join(eve[0], eveFile))
os.mkdir(tempDist)
for eve in tempFileList:
temp = os.path.split(eve.replace(tempPath, tempDist))
if not os.path.exists(temp[0]):
os.makedirs(temp[0])
if eve.endswith(".html") or eve.endswith(".htm"):
with open(eve) as readData:
with open(eve.replace(tempPath, tempDist), "w") as writeData:
writeData.write(readData.read().
replace('{{ user }}', os.environ.get('blog_user')).
replace('{{ email }}', os.environ.get('blog_email')).
replace('{{ title }}', os.environ.get('website_title')).
replace('{{ keywords }}', os.environ.get('website_keywords')).
replace('{{ about_me }}', os.environ.get('blog_about_me')).
replace('{{ host }}', os.environ.get('blog_host')).
replace('{{ description }}', os.environ.get('website_description')))
else:
shutil.copy(eve, eve.replace(tempPath, tempDist))
return True
except Exception as e:
raise e
if __name__ == "__main__":
print("获取Yaml数据： ", setEnv())
print("建立数据库：", initDb())
print("建立数据库：", initTable())
print("初始化HTML：", initHTML())公共组件的开发
项目中会有很多公共组件，例如数据库，所以我把数据库的代码统一放在了一起：common/mysqlCommon.py:
# -*- coding: utf8 -*-
import os
import re
import pymysql
import hashlib
from random import choice
class mysqlCommon:
def __init__(self):
self.getConnection({
"host": os.environ.get('mysql_host'),
"user": os.environ.get('mysql_user'),
"port": int(os.environ.get('mysql_port')),
"db": os.environ.get('mysql_db'),
"password": os.environ.get('mysql_password')
})
def getDefaultPic(self):
return choice([
'http://t8.baidu.com/it/u=1484500186,1503043093&fm=79&app=86&f=JPEG?w=1280&h=853',
'http://t8.baidu.com/it/u=2247852322,986532796&fm=79&app=86&f=JPEG?w=1280&h=853',
'http://t7.baidu.com/it/u=3204887199,3790688592&fm=79&app=86&f=JPEG?w=4610&h=2968',
'http://t9.baidu.com/it/u=3363001160,1163944807&fm=79&app=86&f=JPEG?w=1280&h=830',
'http://t9.baidu.com/it/u=583874135,70653437&fm=79&app=86&f=JPEG?w=3607&h=2408',
'http://t9.baidu.com/it/u=583874135,70653437&fm=79&app=86&f=JPEG?w=3607&h=2408',
'http://t9.baidu.com/it/u=1307125826,3433407105&fm=79&app=86&f=JPEG?w=5760&h=3240',
'http://t9.baidu.com/it/u=2268908537,2815455140&fm=79&app=86&f=JPEG?w=1280&h=719',
'http://t7.baidu.com/it/u=1179872664,290201490&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t9.baidu.com/it/u=3949188917,63856583&fm=79&app=86&f=JPEG?w=1280&h=875',
'http://t9.baidu.com/it/u=2266751744,4253267866&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t8.baidu.com/it/u=4100756023,1345858297&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t7.baidu.com/it/u=1355385882,1155324943&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t9.baidu.com/it/u=2292037961,3689236171&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t9.baidu.com/it/u=4241966675,2405819829&fm=79&app=86&f=JPEG?w=1280&h=854',
'http://t8.baidu.com/it/u=2857883419,1187496708&fm=79&app=86&f=JPEG?w=1280&h=763',
'http://t8.baidu.com/it/u=198337120,441348595&fm=79&app=86&f=JPEG?w=1280&h=732'
])
def getConnection(self, conf):
self.connection = pymysql.connect(host=conf['host'],
user=conf['user'],
password=conf['password'],
port=int(conf['port']),
db=conf['db'],
charset='utf8',
cursorclass=pymysql.cursors.DictCursor,
autocommit=1)
def doAction(self, stmt, data):
try:
self.connection.ping(reconnect=True)
cursor = self.connection.cursor()
cursor.execute(stmt, data)
result = cursor
cursor.close()
return result
except Exception as e:
print(e)
try:
cursor.close()
except:
pass
return False
def getCategoryList(self):
search_stmt = (
"SELECT * FROM `category` ORDER BY `sorted`"
)
result = self.doAction(search_stmt, ())
if result == False:
return False
return [{"id": eveCategory['cid'], "name": eveCategory['name']} for eveCategory in result.fetchall()]
def getArticleList(self, category, tag, page=1):
if category:
search_stmt = (
"SELECT article.*,category.name FROM `article` LEFT JOIN `category` ON article.category=category.cid WHERE article.category=%s ORDER BY -article.aid LIMIT %s,%s;"
)
count_stmt = (
"SELECT COUNT(*) FROM `article` LEFT JOIN `category` ON article.category=category.cid WHERE article.category=%s;"
)
data = (category, 10 * (int(page) - 1), 10 * int(page))
count_data = (category,)
elif tag:
search_stmt = (
"SELECT article.* FROM `article` LEFT JOIN `article_tags` ON article.aid=article_tags.aid WHERE article_tags.tid=%s ORDER BY -article.aid LIMIT %s,%s;"
)
count_stmt = (
"SELECT COUNT(*) FROM `article`LEFT JOIN `article_tags` ON article.aid=article_tags.aid WHERE article_tags.tid=%s;"
)
data = (tag, 10 * (int(page) - 1), 10 * int(page))
count_data = (tag,)
else:
search_stmt = (
"SELECT article.*,category.name FROM `article` LEFT JOIN `category` ON article.category=category.cid ORDER BY -article.aid LIMIT %s,%s;"
)
count_stmt = (
"SELECT COUNT(*) FROM `article` LEFT JOIN `category` ON article.category=category.cid; "
)
data = (10 * (int(page) - 1), 10 * int(page))
count_data = ()
result = self.doAction(search_stmt, data)
if result == False:
return False
return {"data": [{"id": eveArticle['aid'],
"title": eveArticle['title'],
"description": eveArticle['description'],
"watched": eveArticle['watched'],
"category": eveArticle['category'],
"publish": str(eveArticle['publish']),
"picture": self.getPicture(eveArticle['content'])}
for eveArticle in result.fetchall()],
"count": self.doAction(count_stmt, count_data).fetchone()["COUNT(*)"]}
def getHotArticleList(self):
search_stmt = (
"SELECT article.*,category.name FROM `article` LEFT JOIN `category` ON article.category=category.cid ORDER BY article.watched LIMIT 0,5"
)
result = self.doAction(search_stmt, ())
if result == False:
return False
return [{"id": eveArticle['aid'],
"title": eveArticle['title'],
"description": eveArticle['description'],
"watched": eveArticle['watched'],
"category": eveArticle['category'],
"publish": str(eveArticle['publish']),
"picture": self.getPicture(eveArticle['content'])}
for
eveArticle in result.fetchall()]
def getTagsArticle(self, aid):
search_stmt = (
"SELECT tags.name, tags.tid FROM `article_tags` LEFT JOIN `tags` ON article_tags.tid=tags.tid WHERE article_tags.aid=%s;"
)
result = self.doAction(search_stmt, (aid,))
if result == False:
return False
return [{"id": eveTag["tid"], "name": eveTag["name"]} for eveTag in result.fetchall()]
def getTagsList(self):
search_stmt = (
"SELECT * FROM tags ORDER BY RAND() LIMIT 20; "
)
result = self.doAction(search_stmt, ())
if result == False:
return False
return [{"id": eveTag['tid'], "name": eveTag['name']} for eveTag in result.fetchall()]
def getArticleContent(self, aid):
search_stmt = (
"SELECT article.*, category.name FROM `category` LEFT JOIN `article` ON category.cid=article.category WHERE article.aid=%s;"
)
result = self.doAction(search_stmt, (aid))
if result == False:
return False
article = result.fetchone()
return {
"id": article["aid"],
"title": article["title"],
"content": article["content"],
"description": article["description"],
"watched": article["watched"],
"category": article["name"],
"publish": str(article["publish"]),
"tags": self.getTagsArticle(article["aid"]),
"next": self.getOtherArticle(aid, "next"),
"pre": self.getOtherArticle(aid, "pre")
} if article else {}
def getOtherArticle(self, aid, articleType):
search_stmt = (
"SELECT * FROM `article` WHERE aid=(select max(aid) from `article` where aid>%s)"
) if articleType == "next" else (
"SELECT * FROM `article` WHERE aid=(select max(aid) from `article` where aid<%s)"
)
result = self.doAction(search_stmt, (aid))
if result == False:
return False
article = result.fetchone()
return {
"id": article["aid"],
"title": article["title"]
} if article else {}
def getComments(self, aid):
search_stmt = (
"SELECT * FROM `comments` WHERE article=%s AND is_show=1 ORDER BY -cid LIMIT 100;"
)
result = self.doAction(search_stmt, (aid))
if result == False:
return False
return [{"content": eveComment['content'],
"publish": str(eveComment['publish']),
"user": eveComment['user'],
"remark": eveComment['remark']} for eveComment in result.fetchall()]
def addComment(self, content, user, email, aid):
insert_stmt = (
"INSERT INTO `comments` (`cid`, `content`, `publish`, `user`, `email`, `article`, `uni_mark`) "
"VALUES (NULL, %s, CURRENT_TIMESTAMP, %s, %s, %s, %s)"
)
result = self.doAction(insert_stmt, (content, user, email, aid, hashlib.md5(
("%s----%s----%s----%s" % (str(content), str(user), str(email), str(aid))).encode("utf-8")).hexdigest()))
return False if result == False else True
def updateArticleWatched(self, wid):
update_stmt = (
"UPDATE `article` SET `watched`=`watched`+1 WHERE `aid` = %s"
)
return False if self.doAction(update_stmt, (wid)) == False else True
def getPicture(self, content):
resultList =[eve[1] for eve in re.findall('<img(.*?)src="(.*?)"(.*?)>', content)]
return resultList[0] if resultList else self.getDefaultPic()
def getTag(self, tag):
search_stmt = (
"SELECT * FROM `tags` WHERE name=%s;"
)
result = self.doAction(search_stmt, (tag,))
return False if not result or result.rowcount == 0 else result.fetchone()['tid']
def addTag(self, tag):
insert_stmt = (
"INSERT INTO `tags` (`tid`, `name`, `remark`) "
"VALUES (NULL, %s, NULL)"
)
result = self.doAction(insert_stmt, (tag))
return False if result == False else result.lastrowid
def addArticleTag(self, article, tag):
insert_stmt = (
"INSERT INTO `article_tags` (`atid`, `aid`, `tid`) "
"VALUES (NULL, %s, %s)"
)
result = self.doAction(insert_stmt, (article, tag))
return False if result == False else True这里实现的是数据库增删改查的全部功能（admin除外），在使用的时候分为本地和线上：
try:
import returnCommon
from mysqlCommon import mysqlCommon
except:
import common.testCommon
common.testCommon.setEnv()
import common.returnCommon as returnCommon
from common.mysqlCommon import mysqlCommon
mysql = mysqlCommon()利用Python异常，如果导入没找到，那就说明是本地测试，如果from mysqlCommon import mysqlCommon找到了，那就说明是线上环境。除了数据库的公共组件，还会有returnCommon等公共文件。 这些文件在使用的时候也需要打包进入，可以在yaml中增加include，例如：
Blog_Web_addComment:
component: "@serverless/tencent-scf"
inputs:
name: Blog_Web_addComment
description: 添加评论
codeUri: ./cloudFunctions/addComment
handler: ${Conf.handler}
runtime: ${Conf.runtime}
region: ${Conf.region}
include:
- ${Conf.include_common}功能展示
前台功能
- 列表页
- 内容页
后台功能
- 登录功能
- 列表页
- 表单页
项目部署
- 配置
serverless.yaml：
# 函数们的整体配置信息
Conf:
component: "serverless-global"
inputs:
region: ap-shanghai
runtime: Python3.6
handler: index.main_handler
include_common: ./common
blog_user: Dfounder
blog_email: service@anycodes.cn
website_title: Serverless Blog System
website_keywords: Serverless, Serverless Framework, Tencent Cloud, SCF
website_description: 一款基于腾讯云Serverless架构，并且采用Serverless Framework构建的Serverless博客系统。
website_bucket: serverless-blog-1256773370
mysql_host:
mysql_password:
mysql_port:
mysql_db:
admin_user: mytest
admin_password: mytest除此之外，还需要关注域名问题：
# 网站
CosBucket:
component: '@serverless/tencent-website'
inputs:
code:
root: website/dist
src: ./
index: list.html
region: ${Conf.region}
bucketName: ${Conf.website_bucket}
hosts:
- host: 0duzhan.com
https:
certId: awPsOIHY
forceSwitch: -1
- host: www.0duzhan.com
https:
certId: awPsOIHY
forceSwitch: -1
env:
apiUrl: ${APIService.subDomain}API网关内容：
# 创建API网关Service
APIService:
component: "@serverless/tencent-apigateway"
inputs:
region: ${Conf.region}
customDomain:
- domain: api.0duzhan.com
isDefaultMapping: 'FALSE'
pathMappingSet:
- path: /
environment: release
protocols:
- http
protocols:
- http
- https
........这里可以将这两部分域名可以修改成自己的。
- 执行
init.py:
这里需要注意的是，该示例是在MacOS下开发的，所以init.py应该可在mac/linux运行，windows用户需要做适当修改。
另外，还需要安装一个依赖：pyyaml：
获取Yaml数据： True
建立数据库： True
建立数据库： True
初始化HTML： True- 部署资源，执行
serverless --debug
(venv) ServerlessBlog:ServerlessBlog dfounderliu$ sls --debug
DEBUG ─ Resolving the template's static variables.
DEBUG ─ Collecting components from the template.
DEBUG ─ Downloading any NPM components found in the template.
DEBUG ─ Analyzing the template's components dependencies.
DEBUG ─ Creating the template's components graph.
DEBUG ─ Syncing template state.
DEBUG ─ Executing the template's components graph.
DEBUG ─ Preparing website Tencent COS bucket serverless-blog-1256773370.
DEBUG ─ Starting API-Gateway deployment with name APIService in the ap-shanghai region
DEBUG ─ Using last time deploy service id service-23ybmuq7
DEBUG ─ Updating service with serviceId service-23ybmuq7.
DEBUG ─ Bucket "serverless-blog-1256773370" in the "ap-shanghai" region alrea
………………
-
path: /web/article/watched/update
method: POST
apiId: api-gnvnrbyk
-
path: /web/sentence/get
method: POST
apiId: api-msvadsau
-
path: /web/article/list/hot/get
method: POST
apiId: api-kfkrjhim
-
path: /web/tags/list/get
method: POST
apiId: api-avydagem
-
path: /admin
method: ANY
apiId: api-4tnz5tc4
176s › APIService › done项目总结
目前，传统博客已经有很多了，基于PHP的zblog、wp等开源项目都可以帮助我们快速搭建一个博客系统，但是基于Serverless架构的博客系统是比较少见的。
本文通过原生Serverless项目开发和Flask框架部署实现了一个基于Python语言的博客系统，在这个系统实现了文章发布、自动撰写文章的关键词和摘要，还可以进行留言评论的管理。不过，这个博客系统仅作为工程实践使用，所以仍然会存在BUG或者设计不合理的地方，如果要是实际应用，还需接着完善。
- 发表于:
- 本文为 InfoQ 中文站特供稿件
- 首发地址：https://www.infoq.cn/article/rzwEZdqiZi6mwzmVKht8
- 如有侵权，请联系 cloudcommunity@tencent.com 删除。
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