【云计算】之trove源码走读

阅读trove代码

2021-8-9

下载完trove代码（内部叫ktrove），好开始读代码啦，希望可以加深理解trove业务，以及可以学习python这双重功效！加油！

代码结构这样子：

4个文件夹，以及一堆特殊文件，先上层特殊文件是干啥的

一堆特殊文件

setup.py

最重要的2个setup.cfg，setup.py打包用的

setup.py怎么写，好了，参考如下

https://zhuanlan.zhihu.com/p/261579357

https://zhuanlan.zhihu.com/p/276461821?utm_oi=948852089393336320

例如下面的代码

是用pbr打包神奇，把setup.cfg中的参数过滤出来，作为参数传入到setup.py的setup()函数中

import setuptools
import sys

# In python < 2.7.4, a lazy loading of package `pbr` will break
# setuptools if some other modules registered functions in `atexit`.
# solution from: http://bugs.python.org/issue15881#msg170215
try:
    import multiprocessing  # noqa
except ImportError:
    pass

data_files = []
if sys.platform == 'linux2':
    from glob import glob
    data_files = [("/etc/init.d", glob("etc/trove/init.d/*")),
                  ("/etc/logrotate.d", glob("etc/trove/logrotate.d/*"))]

setuptools.setup(
    setup_requires=['pbr>=2.0.0'],
    pbr=True,
    data_files=data_files,
)

setup.cfg

好了，那么看看setup.cfg是怎么写的，主要是name和entry_points参数

[metadata]
name = trove     包名称                        
summary = OpenStack DBaaS   
description-file =   
    README.rst
author = OpenStack  程序作者
author-email = openstack-dev@lists.openstack.org  程序作者邮箱
home-page = https://wiki.openstack.org/wiki/Trove
classifier =
    Environment :: OpenStack
    Intended Audience :: Information Technology
    Intended Audience :: System Administrators
    License :: OSI Approved :: Apache Software License
    Operating System :: POSIX :: Linux
    Programming Language :: Python
    Programming Language :: Python :: 2
    Programming Language :: Python :: 2.7
    Programming Language :: Python :: 3
    Programming Language :: Python :: 3.5

[files]
packages =
    trove

[entry_points]    关键参数，动态发现配置和插件
console_scripts =
    ktrove-api = trove.cmd.api:main
    ktrove-taskmanager = trove.cmd.taskmanager:main
    monitor-taskmanager = trove.cmd.taskmanager:main
    trove-mgmt-taskmanager = trove.cmd.taskmanager:mgmt_main
    trove-conductor = trove.cmd.conductor:main
    ktrove-manage = trove.cmd.manage:main
    trove-guestagent = trove.cmd.guest:main
    trove-fake-mode = trove.cmd.fakemode:main
    monitor-api = trove.cmd.monapi:main
    ktrove-minister = trove.cmd.minister:main

trove.api.extensions =
    account = trove.extensions.routes.account:Account
    mgmt = trove.extensions.routes.mgmt:Mgmt
    mysql = trove.extensions.routes.mysql:Mysql
    security_group = trove.extensions.routes.security_group:Security_group

trove.guestagent.module.drivers =
    ping = trove.guestagent.module.drivers.ping_driver:PingDriver
    new_relic_license = trove.guestagent.module.drivers.new_relic_license_driver:NewRelicLicenseDriver

# These are for backwards compatibility with Havana notification_driver configuration values
oslo.messaging.notify.drivers =
    trove.openstack.common.notifier.log_notifier = oslo_messaging.notify._impl_log:LogDriver
    trove.openstack.common.notifier.no_op_notifier = oslo_messaging.notify._impl_noop:NoOpDriver
    trove.openstack.common.notifier.rpc_notifier2 = oslo_messaging.notify.messaging:MessagingV2Driver
    trove.openstack.common.notifier.rpc_notifier = oslo_messaging.notify.messaging:MessagingDriver
    trove.openstack.common.notifier.test_notifier = oslo_messaging.notify._impl_test:TestDriver

tempest.test_plugins =
    trove_tests = trove.tests.tempest.plugin:TroveTempestPlugin

[global]
setup-hooks =
    pbr.hooks.setup_hook

[build_sphinx]
all_files = 1
build-dir = doc/build
source-dir = doc/source
warning-is-error = 1

[compile_catalog]
directory = trove/locale
domain = trove

[update_catalog]
domain = trove
output_dir = trove/locale
input_file = trove/locale/trove.pot

[extract_messages]
keywords = _ gettext ngettext l_ lazy_gettext
mapping_file = babel.cfg
output_file = trove/locale/trove.pot

[wheel]
universal = 1

trove命令行与代码

[entry_points]    关键参数，动态发现配置和插件
console_scripts =
    ktrove-api = trove.cmd.api:main
    ktrove-taskmanager = trove.cmd.taskmanager:main
    monitor-taskmanager = trove.cmd.taskmanager:main
    trove-mgmt-taskmanager = trove.cmd.taskmanager:mgmt_main
    trove-conductor = trove.cmd.conductor:main
    ktrove-manage = trove.cmd.manage:main
    trove-guestagent = trove.cmd.guest:main
    trove-fake-mode = trove.cmd.fakemode:main
    monitor-api = trove.cmd.monapi:main
    ktrove-minister = trove.cmd.minister:main

看到这里恍然大悟，打包后的模块名是ktrove-manage，在执行 ktrove-manage param_xxx时候，其实等于调用了 trove.cmd.manage:main param_xxx

那么我们来具体看看，平时使用的命令，是怎么执行的吧：

例如1， ktrove-manage flow-list $instance_id

例如2， trove命令创建实例：

trove create liurong_0421_pm15 HA --flavor RDSOpenAPI_76f7d523d28b9f66 --datastore_type ebs_sqlserver --datastore_version 2014 --admin_user admin --admin_password LIUrong123@

4个文件夹

etc-

init-

tools-

trove-

大道至简