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OpenStack 源码分析之 Neutron
  • 前言
  • 整体结构
  • bin
  • doc
  • etc
    • init.d/
    • neutron/
    • api-paste.ini
    • dhcp_agent.ini
    • fwaas_driver.ini
    • l3_agent.ini
    • lbaas_agent.ini
    • metadata_agent.ini
    • metering_agent.ini
    • vpn_agent.ini
    • neutron.conf
    • policy.json
    • rootwrap.conf
    • services.conf
  • neutron
    • agent
      • common/
      • linux/
      • metadata/
      • dhcp_agent.py
      • firewall.py
      • l2population_rpc.py
      • l3_agent.py
      • l3_ha_agent.py
      • netns_cleanup_util.py
      • ovs_cleanup_util.py
      • rpc.py
      • securitygroups_rpc.py
    • api
      • rpc
      • v2
      • views
      • api_common.py
      • extensions.py
      • versions.py
    • cmd
    • common
      • config.py
      • constants.py
      • exceptions.py
      • ipv6_utils.py
      • log.py
      • rpc.py
      • test_lib.py
      • topics.py
      • utils.py
    • db
      • agents_db.py
      • agentschedulers_db.py
      • api.py
      • common_db_mixin.py
      • db_base_plugin_v2.py
      • migration
      • model_base.py
      • models_v2.py
      • securitygroups_rpc_base.py
      • sqlalchemyutils.py
      • 扩展资源和操作类
        • allowedaddresspairs_db.py
        • dvr_mac_db.py
        • external_net_db.py
        • extradhcpopt_db.py
        • extraroute_db.py
        • firewall
        • l3_agentschedulers_db.py
        • l3_attrs_db.py
        • l3_db.py
        • l3_dvr_db.py
        • l3_dvrscheduler_db.py
        • l3_gwmode_db.py
        • l3_hamode_db.py
        • l3_hascheduler_db.py
        • loadbalancer
        • metering
        • portbindings_base.py
        • portbindings_db.py
        • portsecurity_db.py
        • quota_db.py
        • routedserviceinsertion_db.py
        • routerservicetype_db.py
        • securitygroups_db.py
        • servicetype_db.py
        • vpn
    • debug
      • commands.py
      • debug_agent.py
      • shell.py
    • extensions
      • agent.py
      • allowedaddresspairs.py
      • dhcpagentscheduler.py
      • dvr.py
      • external_net.py
      • extraroute.py
      • extra_dhcp_opt.py
      • firewall.py
      • flavor.py
      • l3.py
      • l3agentscheduler.py
      • l3_ext_gw_mode.py
      • l3_ext_ha_mode.py
      • lbaas_agentscheduler.py
      • loadbalancer.py
      • metering.py
      • multiprovidernet.py
      • portbindings.py
      • portsecurity.py
      • providernet.py
      • quotasv2.py
      • routedserviceinsertion.py
      • routerservicetype.py
      • securitygroup.py
      • servicetype.py
      • vpnaas.py
      • init.py
    • hacking
      • checks.py
      • init.py
    • locale
    • notifiers
      • nova.py
      • init.py
    • openstack
      • common
        • cache
        • context.py
        • eventlet_backdoor.py
        • fileutils.py
        • fixture
        • local.py
        • lockutils.py
        • log.py
        • loopingcall.py
        • middleware
        • periodic_task.py
        • policy.py
        • processutils.py
        • service.py
        • systemd.py
        • threadgroup.py
        • uuidutils.py
        • versionutils.py
        • _i18n.py
    • plugins
      • bigswitch
        • agent
        • config.py
        • db
        • extensions
        • l3_router_plugin.py
        • plugin.py
        • routerrule_db.py
        • servermanager.py
        • tests
        • vcsversion.py
        • version.py
        • init.py
      • brocade
        • db
        • NeutronPlugin.py
        • nos
        • tests
        • vlanbm.py
        • init.py
      • cisco
        • cfg_agent
        • common
        • db
        • extensions
        • l2device_plugin_base.py
        • l3
        • models
        • n1kv
        • network_plugin.py
        • service_plugins
        • init.py
      • common
        • constants.py
        • utils.py
        • init.py
      • embrane
        • agent
        • base_plugin.py
        • common
        • l2base
        • plugins
        • init.py
      • hyperv
        • agent
        • agent_notifier_api.py
        • common
        • db.py
        • hyperv_neutron_plugin.py
        • model.py
        • rpc_callbacks.py
        • init.py
      • ibm
        • agent
        • common
        • sdnve_api.py
        • sdnve_api_fake.py
        • sdnve_neutron_plugin.py
      • linuxbridge
        • agent
        • common
        • db
        • init.py
      • metaplugin
        • common
        • meta_db_v2.py
        • meta_models_v2.py
        • meta_neutron_plugin.py
        • proxy_neutron_plugin.py
        • init.py
      • midonet
        • agent
        • common
        • midonet_lib.py
        • plugin.py
        • init.py
      • ml2
        • common
        • config.py
        • db.py
        • drivers
        • driver_api.py
        • driver_context.py
        • managers.py
        • models.py
        • plugin.py
        • rpc.py
      • mlnx
        • agent
        • agent_notify_api.py
        • common
        • db
        • mlnx_plugin.py
        • rpc_callbacks.py
        • init.py
      • nec
        • agent
        • common
        • db
        • drivers
        • extensions
        • nec_plugin.py
        • nec_router.py
        • ofc_driver_base.py
        • ofc_manager.py
        • packet_filter.py
        • router_drivers.py
        • init.py
      • nuage
        • common
        • extensions
        • nuagedb.py
        • nuage_models.py
        • plugin.py
        • syncmanager.py
        • init.py
      • ofagent
        • agent
        • common
      • oneconvergence
        • agent
        • lib
        • plugin.py
        • init.py
      • opencontrail
        • common
        • contrail_plugin.py
        • init.py
      • openvswitch
        • agent
        • common
        • ovs_models_v2.py
        • init.py
      • plumgrid
        • common
        • drivers
        • plumgrid_plugin
        • init.py
      • sriovnicagent
        • common
        • eswitch_manager.py
        • pci_lib.py
        • sriov_nic_agent.py
        • init.py
      • vmware
        • api_client
        • check_nsx_config.py
        • common
        • dbexts
        • dhcpmeta_modes.py
        • dhcp_meta
        • extensions
        • nsxlib
        • nsx_cluster.py
        • plugin.py
        • plugins
        • shell
        • vshield
        • init.py
    • scheduler
      • dhcp_agent_scheduler.py
      • l3_agent_scheduler.py
    • server
    • service.py
    • services
      • firewall
        • agents
        • drivers
        • fwaas_plugin.py
      • l3_router
        • brocade
        • l3_apic.py
        • l3_arista.py
        • l3_router_plugin.py
        • init.py
      • loadbalancer
        • agent
        • agent_scheduler.py
        • constants.py
        • drivers
        • plugin.py
      • metering
        • agents
        • drivers
        • metering_plugin.py
      • provider_configuration.py
      • service_base.py
      • vpn
        • agent.py
        • common
        • device_drivers
        • plugin.py
        • service_drivers
        • init.py
      • init.py
    • tests
      • base.py
      • common
        • agents
        • init.py
      • etc
        • rootwrap.d
      • fake_notifier.py
      • functional
        • agent
        • base.py
        • contrib
        • db
        • sanity
        • init.py
      • post_mortem_debug.py
      • tools.py
      • unit
      • var
      • init.py
    • auth.py
    • context.py
    • hooks.py
    • i18n.py
    • manager.py
    • neutron_plugin_base_v2.py
    • policy.py
    • quota.py
    • service.py
    • version.py
    • wsgi.py
  • rally-jobs
    • extra
      • README.rst
    • plugins
      • README.rst
      • init.py
    • neutron-neutron.yaml
    • README.rst
  • tools
    • check_bash.sh
    • check_i18n.py
    • check_i18n_test_case.txt
    • clean.sh
    • i18n_cfg.py
    • install_venv.py
    • install_venv_common.py
    • pretty_tox.sh
    • with_venv.sh
  • 理解代码
    • 调用逻辑
    • REST API 专题
    • RPC 专题
      • agent RPC
      • plugin RPC
      • neutron-server RPC
    • Plugin 专题
    • Extension 专题
    • Agent 专题
    • Driver 专题
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  • agent.py
  • namespace_proxy.py

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  1. neutron
  2. agent

metadata/

agent.py

主要包括MetadataProxyHandler、UnixDomainHttpProtocol、WorkerService、UnixDomainWSGIServer、UnixDomainMetadataProxy几个类和一个main函数。 该文件的主逻辑代码为:

cfg.CONF.register_opts(UnixDomainMetadataProxy.OPTS)
    cfg.CONF.register_opts(MetadataProxyHandler.OPTS)
    cache.register_oslo_configs(cfg.CONF)
    cfg.CONF.set_default(name='cache_url', default='memory://?default_ttl=5')
    agent_conf.register_agent_state_opts_helper(cfg.CONF)
    config.init(sys.argv[1:])
    config.setup_logging(cfg.CONF)
    utils.log_opt_values(LOG)
    proxy = UnixDomainMetadataProxy(cfg.CONF)
    proxy.run()

在读取相关配置完成后,则实例化一个UnixDomainMetadataProxy,并调用其run函数。run函数则进一步创建一个server = UnixDomainWSGIServer('neutron-metadata-agent') 对象,并调用其start()和wait()函数。

run函数会将应用绑定到MetadataProxyHandler()类,该类包括一个__call__函数,调用_proxy_request()对传入的HTTP请求进行处理。

namespace_proxy.py

定义了UnixDomainHTTPConnection、NetworkMetadataProxyHandler、ProxyDaemon三个类和主函数。主函数代码为

    eventlet.monkey_patch()
    opts = [
        cfg.StrOpt('network_id',
                   help=_('Network that will have instance metadata '
                          'proxied.')),
        cfg.StrOpt('router_id',
                   help=_('Router that will have connected instances\' '
                          'metadata proxied.')),
        cfg.StrOpt('pid_file',
                   help=_('Location of pid file of this process.')),
        cfg.BoolOpt('daemonize',
                    default=True,
                    help=_('Run as daemon.')),
        cfg.IntOpt('metadata_port',
                   default=9697,
                   help=_("TCP Port to listen for metadata server "
                          "requests.")),
        cfg.StrOpt('metadata_proxy_socket',
                   default='$state_path/metadata_proxy',
                   help=_('Location of Metadata Proxy UNIX domain '
                          'socket'))
    ]

    cfg.CONF.register_cli_opts(opts)
    # Don't get the default configuration file
    cfg.CONF(project='neutron', default_config_files=[])
    config.setup_logging(cfg.CONF)
    utils.log_opt_values(LOG)
    proxy = ProxyDaemon(cfg.CONF.pid_file,
                        cfg.CONF.metadata_port,
                        network_id=cfg.CONF.network_id,
                        router_id=cfg.CONF.router_id)

    if cfg.CONF.daemonize:
        proxy.start()
    else:
        proxy.run()

其基本过程也是读取完成相关的配置信息,然后启动一个ProxyDaemon实例,以daemon或run方法来运行。run方法则创建一个wsgi服务器,然后运行。最终绑定的应用为NetworkMetadataProxyHandler。

proxy = wsgi.Server('neutron-network-metadata-proxy')
proxy.start(handler, self.port)
proxy.wait()
Previouslinux/Nextdhcp_agent.py

Last updated 5 years ago

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