python 处理haproxy 添加backend 备忘

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

import re,os
from io import BytesIO
from saltapiauth import SaltApi
from jinja2 import Template

salta = SaltApi()

# contents is dict
def Tempdrawing(contents, flag='proxy'):
    try:
        if flag == 'proxy':

            tempfile = os.path.join('static','nginx_models','nginx_proxy_model')

        elif flag == 'sshcon':

            tempfile = os.path.join('static','nginx_models','nginx_ssh_model')

        else:

            raise Exception()

        with open(tempfile) as f:

            temp_str = f.read()

        template = Template(temp_str)

        result = template.render(contents)

        return result

    except Exception as e:
        print(str(e))
        return str(e)

class OptHaproxy():

    def __init__(self):
        self.filename = '/etc/haproxy/haproxy.cfg.ori'
        self.hostname = 'Min-Centos1'
        self.statename = 'haproxy'
        self.pre_modelfile = 'haproxy_model_pre'
        self.after_modelfile = 'haproxy_model_after'

    def getinfo(self):

        command = 'cat %s' %self.filename
        res = salta.host_remote_execution_module(self.hostname,'cmd.run',command)
        # try:
        #     os.remove(self.pre_modelfile)
        # except Exception as e:
        #     pass

        with open(self.pre_modelfile,'w') as f:
            f.write(res[self.hostname])
        return res[self.hostname]

    def showinfo(self):
        sh = self.getinfo()
        print(sh)

    def modify(self,itname,*value):
        flag = 1
        preflag = 1
        finflag = 1
        server_set = []

        # 将需要修改的部分提取出,并去重

        with open(self.pre_modelfile,'r') as pre:
            for line in pre:
                if line.startswith('backend'):
                    preflag = 1

                if preflag == 2:
                    if line.strip() != '':
                        server_set.append(line)

                if re.search(itname,line) and line.startswith('backend'):
                    preflag = 2
                    continue

        for i in value:
            fina = '%s%s%s'%('\t',i,'\n')
            if fina not in server_set:
                server_set.append(fina)

        print(server_set)

        ## 将需要修改的部分添加到配置文件中

        with open(self.pre_modelfile,'r') as pref ,open(self.after_modelfile,'w') as afterf:
            for line in pref:

                if flag == 1 and finflag == 1:
                    afterf.write(line)

                if re.search(itname,line) and line.startswith('backend'):
                    flag = 2
                    continue

                if flag == 2 and finflag == 1:

                    for unit in server_set:
                        afterf.write(unit)
                    finflag = 2
                    flag = 1
                    continue

                if line.startswith('backend'):
                    nline = '%s%s'%('\n',line)
                    afterf.write(nline)
                    finflag = 1

    def deploy(self):
        fio = BytesIO()
        with open(self.after_modelfile,'r') as af:
            for chunk in af:
                fio.write(chunk)
        depres = salta.server_hosts_pillar(self.hostname,self.statename,pillar={'config' : fio.getvalue()})
        print(depres)

    def check(self):
        chkres = salta.host_remote_execution_module(self.hostname,'service.status',self.statename)
        print(chkres)

if __name__ == '__main__':
    ha = OptHaproxy()
    ha.getinfo()
    # ha.showinfo()
    val = 'server web-node4 192.168.44.40:80 check  weight 80'
    val2 = 'server web-node3 192.168.44.30:88 check  weight 50'
    ha.modify('backend_www_example_com',val,val2)
    ha.deploy()