接上篇《授之以渔-运维平台发布模块二（Jenkins篇）》，今天介绍下项目的回滚机制。

我的平台用到Jenkins API的创建项目，删除，更新，查看变更，构建。

一、利用Jenkins-python 创建项目

    def create_job(self, name, config_xml):
        if self.job_exists(name):
            raise JenkinsException('job[%s] already exists' % (name))

        headers = {'Content-Type': 'text/xml'}
        self.jenkins_open(urllib2.Request(
            self.server + CREATE_JOB % locals(), config_xml, headers))
        if not self.job_exists(name):
            raise JenkinsException('create[%s] failed' % (name))

我的平台需要做的就是传递一个项目名称，一个config_xml（配置文档）,在用程序生成config_xml，我传递了下面几个参数：svn_daysToKeep,svn_numToKeep,svn_name,svn_publish_address,svn_address,svn_name,svn_name
svn_daysToKeep：构建项目保存时间，过了时间会自动删除以前的
svn_numToKeep：构建项目保存版本号数量，过了数量会自动删除以前的
svn_name：构建项目名称
svn_publish_address：发布地址（RPM包安装地址，构建FPM请参看之前的文章）
svn_address：SVN地址
config_xml如下：

"""<?xml version='1.0' encoding='UTF-8'?>
<project>
  <actions/>
  <description></description>
  <logRotator class="hudson.tasks.LogRotator">
    <daysToKeep>%s</daysToKeep>
    <numToKeep>%s</numToKeep>
    <artifactDaysToKeep>-1</artifactDaysToKeep>
    <artifactNumToKeep>-1</artifactNumToKeep>
  </logRotator>
  <keepDependencies>false</keepDependencies>
  <properties>
    <hudson.plugins.batch__task.BatchTaskProperty plugin="batch-task@1.16">
      <tasks>
        <hudson.plugins.batch__task.BatchTask>
          <name>%s</name>
            <script>mkdir -p /home/release/$JOB_NAME  && fpm -s dir -x .svn -t rpm -n $JOB_NAME -v $BUILD_NUMBER --prefix %s -C /var/lib/jenkins/workspace/$JOB_NAME -p  /home/release/$JOB_NAME  ./ && createrepo --update /home/release/$JOB_NAME/  && curl -d "job_id=$JOB_NAME" http://172.18.18.24/cmdb/salt_jenkins_post/</script>
        </hudson.plugins.batch__task.BatchTask>
      </tasks>
    </hudson.plugins.batch__task.BatchTaskProperty>
  </properties>
  <scm class="hudson.scm.SubversionSCM" plugin="subversion@1.45">
    <locations>
      <hudson.scm.SubversionSCM_-ModuleLocation>
        <remote>%s</remote>
        <local>.</local>
        <depthOption>infinity</depthOption>
        <ignoreExternalsOption>false</ignoreExternalsOption>
      </hudson.scm.SubversionSCM_-ModuleLocation>
    </locations>
    <excludedRegions></excludedRegions>
    <includedRegions></includedRegions>
    <excludedUsers></excludedUsers>
    <excludedRevprop></excludedRevprop>
    <excludedCommitMessages></excludedCommitMessages>
    <workspaceUpdater class="hudson.scm.subversion.UpdateUpdater"/>
    <ignoreDirPropChanges>false</ignoreDirPropChanges>
    <filterChangelog>false</filterChangelog>
  </scm>
  <canRoam>true</canRoam>
  <disabled>false</disabled>
  <blockBuildWhenDownstreamBuilding>false</blockBuildWhenDownstreamBuilding>
  <blockBuildWhenUpstreamBuilding>false</blockBuildWhenUpstreamBuilding>
  <triggers/>
  <concurrentBuild>false</concurrentBuild>
  <builders/>
  <publishers>
    <hudson.tasks.Mailer plugin="mailer@1.5">
      <recipients>21186716@qq.com</recipients>
      <dontNotifyEveryUnstableBuild>false</dontNotifyEveryUnstableBuild>
      <sendToIndividuals>true</sendToIndividuals>
    </hudson.tasks.Mailer>
    <hudson.plugins.batch__task.BatchTaskInvoker plugin="batch-task@1.16">
      <configs>
        <hudson.plugins.batch__task.BatchTaskInvoker_-Config>
          <project>%s</project>
          <task>%s</task>
        </hudson.plugins.batch__task.BatchTaskInvoker_-Config>
      </configs>
      <threshold>
        <name>UNSTABLE</name>
        <ordinal>1</ordinal>
        <color>YELLOW</color>
      </threshold>
    </hudson.plugins.batch__task.BatchTaskInvoker>
  </publishers>
  <buildWrappers/>
</project>"""%(svn_daysToKeep,svn_numToKeep,svn_name,svn_publish_address,svn_address,svn_name,svn_name)

有了项目名和配置文件，只需要调用jenkins-python接口即可：

from cmdb.myapi.jenkins import jenkins_remote
J = jenkins_remote.Jenkins(jenkins服务器地址,jenkins用户名,jenkins token)
J.create_job(项目名, 项目的config_xml)

至于Jenkins的Token如何生成呢？

登录系统-点击右上角你的用户名称

Paste_Image.png

点击设置-点击Show API Token

Paste_Image.png

二、利用Jenkins-python 构建项目

    def build_job(self, name, parameters=None, token=None):
        if not self.job_exists(name):
            raise JenkinsException('no such job[%s]' % (name))
        return self.jenkins_open(urllib2.Request(
            self.build_job_url(name, parameters, token)))

构建一样要用token，然后的动作就是传入项目名了。

怎么判断一次构建是否完成呢？

    def get_job_info(self, name):
        try:
            response = self.jenkins_open(urllib2.Request(
                self.server + JOB_INFO % locals()))
            if response:
                return json.loads(response)
            else:
                raise JenkinsException('job[%s] does not exist' % name)
        except urllib2.HTTPError:
            raise JenkinsException('job[%s] does not exist' % name)
        except ValueError:
            raise JenkinsException(
                "Could not parse JSON info for job[%s]" % name)

返回结果

>>> J.get_job_info('bbs.youth.cn')
{u'scm': {}, u'color': u'blue', u'lastSuccessfulBuild': {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'number': 137}, u'actions': [{}, {}], u'lastCompletedBuild': {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'number': 137}, u'lastUnsuccessfulBuild': None, u'upstreamProjects': [], u'lastFailedBuild': None, u'healthReport': [{u'iconUrl': u'health-80plus.png', u'score': 100, u'description': u'Build stability: No recent builds failed.'}], u'queueItem': None, u'lastBuild': {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'number': 137}, u'lastStableBuild': {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'number': 137}, u'description': u'\u9752\u7f51\u8bba\u575b', u'downstreamProjects': [], u'concurrentBuild': False, u'lastUnstableBuild': None, u'buildable': True, u'displayNameOrNull': None, u'inQueue': False, u'keepDependencies': False, u'name': u'bbs.youth.cn', u'displayName': u'bbs.youth.cn', u'builds': [{u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'number': 137}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/136/', u'number': 136}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/135/', u'number': 135}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/134/', u'number': 134}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/133/', u'number': 133}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/132/', u'number': 132}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/131/', u'number': 131}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/130/', u'number': 130}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/129/', u'number': 129}, {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/128/', u'number': 128}], u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/', u'firstBuild': {u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/128/', u'number': 128}, u'nextBuildNumber': 138, u'property': [{}]}

本次成功构建的版本号lastSuccessfulBuild的number是137，我需要现将本次构建的nextBuildNumber存入数据库的svn_next_no字段里（比如138），下次构就通过while循环获取get_job_info来获得lastSuccessfulBuild的number（最后一次成功构建的版本号），直到项目从137变成138后，在和数据库中的nextBuildNumber（下次构建的版本号）进行对比，如果一样我就认为项目构建成功了。

我的平台代码如下：

# -*- coding: utf-8 -*-
from cmdb.models import *
from cmdb.myredis.redis_conect import *
from cmdb.myapi.jenkins import jenkins_remote

from django.conf import settings

import time


def release_build_f(job):
    J = jenkins_remote.Jenkins(settings.JENKINS['server'],settings.JENKINS['username'],settings.JENKINS['token'])
    """初始化检测构建项目的当前版本号和下一次版本号"""
    if Svn.objects.get(svn_name=job).svn_next_no == "None" or int(Svn.objects.get(svn_name=job).svn_next_no) != int(J.get_job_info(job)['lastSuccessfulBuild']['number']):
        Svn.objects.filter(svn_name=job).update(svn_next_no = J.get_job_info(job)['nextBuildNumber'])
    else:
        pass
    """构建项目"""
    J.build_job("%s"%job)
    """进入监测版本号变更循环"""
    while True:
        try:
            """如当前构建版本号等于下次构建版本号，跳出循环"""
            time.sleep(5)
            if int(J.get_job_info(job)['lastSuccessfulBuild']['number']) == int(Svn.objects.get(svn_name=job).svn_next_no):
                """跳出"""
                break
        except Exception as err:
            break
            return ("构建异常",err)
    """项目发布后同步构建项目的当前版本号和下一次版本号"""
    try:
        Svn.objects.filter(svn_name=job).update(svn_no = J.get_job_info(job)['lastSuccessfulBuild']['number'],
                                                svn_next_no = J.get_job_info(job)['nextBuildNumber'],
                                                svn_time = '%s %s' %( str(J.get_build_info(job,J.get_job_info(job)['lastSuccessfulBuild']['number'])['id']).split('_')[0],
                                                                      str(J.get_build_info(job,J.get_job_info(job)['lastSuccessfulBuild']['number'])['id']).split('_')[1].replace('-',':'))
        )
    except Exception as err:
        print err
    """清空项目对应的发布状态缓存"""
    try:
        r = redis_conect_db6()
        r.delete(*r.keys('%s*' % job))
    except:
        pass
    return ("%s进入构建队列,版本变更为%s,10秒钟后刷新更新页面"%(job, J.get_job_info(job)['lastSuccessfulBuild']['number']))

三、利用Jenkins-python 查看构建项目变更

    def get_build_info(self, name, number):
        try:
            response = self.jenkins_open(urllib2.Request(
                self.server + BUILD_INFO % locals()))
            if response:
                return json.loads(response)
            else:
                raise JenkinsException('job[%s] number[%d] does not exist'
                                       % (name, number))
        except urllib2.HTTPError:
            raise JenkinsException('job[%s] number[%d] does not exist'
                                   % (name, number))
        except ValueError:
            raise JenkinsException(
                'Could not parse JSON info for job[%s] number[%d]'
                % (name, number)
            )

我们需要传入项目名，然后就是需要查看项目变更的构建版本号

返回结果

>>> J.get_build_info('bbs.youth.cn',137)
{u'building': False, u'changeSet': {u'items': [], u'kind': u'svn', u'revisions': [{u'module': u'http://172.18.11.96/svndata/bbs_youth/trunk', u'revision': 209}]}, u'builtOn': u'', u'description': None, u'artifacts': [], u'timestamp': 1497414529627, u'number': 137, u'actions': [{u'causes': [{u'userName': u'\u5f20\u5e06', u'userId': u'zhangfan', u'shortDescription': u'Started by user \u5f20\u5e06'}]}, {}, {}, {}], u'id': u'2017-06-14_12-28-49', u'keepLog': False, u'url': u'http://172.18.11.98:8080/job/bbs.youth.cn/137/', u'culprits': [], u'result': u'SUCCESS', u'executor': None, u'duration': 1535, u'fullDisplayName': u'bbs.youth.cn #137', u'estimatedDuration': 1865}

changeSet里msg就是变更内容啦