python 简单RPC示例

利用 SimpleXMLRPCServer 演示 简单RPC例子

最后效果

demo.png

动图演示

服务端

server.gif

客户端

client.gif

思路：

服务器端 写了一个小爬虫，获取豆瓣音乐的热门榜，获取数据。
客户端 tcp 链接 服务器端，调用服务器爬虫的方法，并得到返回数据。将数据可视化图表。

需要安转包

服务端 需要安装 beautifulsoup4 来解析网页，爬取数据
pip install beautifulsoup4

bs4.png

客户端 需要安装 flask web框架 和 pygal 生成图表
pip install flask

flask.png

pip install pygal

pygal.png

代码

服务器端代码：

#-*- coding: utf-8 -*-
import urllib2
from bs4 import BeautifulSoup
import json
import string
from SimpleXMLRPCServer import SimpleXMLRPCServer
import sys,os
reload(sys)
sys.setdefaultencoding('utf8')


def music():
    url = "https://music.douban.com/chart"

    html = urllib2.urlopen(url).read().decode("utf-8") 
    soup = BeautifulSoup(html,"html.parser") 

    items = soup.findAll('li',attrs={"class":"clearfix"},limit=8)
    print "starting..."
    
    print len(items)

    result = []
    nStr = ""
    for item in items:
        aTags = item.find('a')
        # get cover img
        img = aTags.find('img')
        img = img.attrs['src']
        img = nStr.join(img)
        # link
        link = aTags.attrs['href']
        link = nStr.join(link)
        # title
        title = item.find("h3").get_text()
        title = nStr.join(title)

        # team and num
        team = item.find("p").get_text()
        num = team.split("/")[1].strip()

        team = team.split("/")[0].strip()
        team = nStr.join(team)
        num = num.replace('次播放','')
        num = num.replace(' ','')
        num = nStr.join(num)
        num = int(num)
        # add to tuple
        result.append((img,link,title,team,num))

        # print img +" : "+ link + " : " + title + " : " + num +" : " + team
    # print result
    return result



address = raw_input("server address : ")

# A simple server with simple arithmetic functions
server = SimpleXMLRPCServer((address, 8000),  allow_none = True)
print "Listening on port 8000..."
server.register_multicall_functions()
server.register_function(music,'music')
server.serve_forever()

客户端代码
flask 结构如下

client
  app
    --static
    --templates
    views.py
    __init__.py
  run.py

static 文件夹内放 需要调用的js文件 pygal-tooltips.min.js 官网

templates文件夹内放置 html的模板文件

charts.html

    
    
    



    author: hejing
    

        
    

views.py

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

from app import app
import xmlrpclib
import pygal
from pygal.style import DefaultStyle
from flask import render_template
import sys,os
reload(sys)
sys.setdefaultencoding('utf8')



@app.route('/')
@app.route('/index')
def index():
    return "Hello, World!"

@app.route('/musicHot')
def musicHot():
    address = raw_input("server address : ")
    proxy = xmlrpclib.ServerProxy("http://"+ address +":8000/", allow_none = True)
    multicall = xmlrpclib.MultiCall(proxy)
    multicall.music()
    result = multicall()
    result = tuple(result)
    total = 0;
    for i in range(len(result)):
        temp = result[i]
        for j in range(len(temp)):
            temp2 = temp[j]
            num = int(temp2[-1])
            total = total +  num
            
    # print total

    pie_chart = pygal.Pie(legend_at_bottom=True)
    title = pie_chart.title = '本周音乐人最热单曲榜  '

    # print "----------\n"
    for i in range(len(result)):
        temp = result[i]
        for j in range(len(temp)):
            temp2 = temp[j]
            num = int(temp2[-1])
            percent = round((num*100.0) / (1.0*total),2)
            pie_chart.add(temp2[-3],percent)

            # for k in range(len(temp2)):
            #   # print temp2[k]
            #   if k == len(temp2):
            #       num = int(temp2[-1])
            #       percent = (num*100.0) / (1.0*total)
                
                

            # print "%d %.2f" % (num, percent ) 
            # print "----------\n"

    chart = pie_chart.render_data_uri()
    return render_template('charts.html', chart = chart)
    # return render_template('charts.html', chart = tuple(result))
 


@app.route('/show')
def show():
    pie_chart = pygal.Pie(egend_at_bottom=True)
    title = pie_chart.title = 'Browser usage in February 2012 (in %)'
    pie_chart.add('IE', 19.5)
    pie_chart.add('Firefox', 36.6)
    pie_chart.add('Chrome', 36.3)
    pie_chart.add('Safari', 4.5)
    pie_chart.add('Opera', 2.3)
    # chart = pie_chart.render()
    chart = pie_chart.render_data_uri()
    return render_template('charts.html', chart = chart)
    # return render_template('charts.html',chart = chart)
    # html = """
    # 
    # 
    # 
    # 
    # 
    # %s
    # 
    # 
    # """ % (title, pie_chart.render())
    # return html

"init.py"

from flask import Flask

app = Flask(__name__)
from app import views

运行

服务端运行

$ python douban.py
server address : 

运行服务器端的 douban.py文件
会提示你输入本机的ip
输入完之后，服务器就一直运行

$ python douban.py
server address : 192.168.1.103
Listening on port 8000...

客户端运行

$ python run.py
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 157-021-568

已经提示已经运行， 这个时候在浏览器上输入
http://localhost:5000/ 就会显示 Hello, World!

helloworld.png

我们地址再改成
http://localhost:5000/musicHot

$ python run.py 
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 157-021-568
127.0.0.1 - - [11/Oct/2016 13:55:58] "GET / HTTP/1.1" 200 -
server address : 

会提示让你输入服务端的地址

$ python run.py 
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 157-021-568
127.0.0.1 - - [11/Oct/2016 13:55:58] "GET / HTTP/1.1" 200 -
server address : 192.168.1.103
127.0.0.1 - - [11/Oct/2016 13:59:12] "GET /musicHot HTTP/1.1" 200 -

我们再看下浏览器

result.png