|
| 1 | +import dubbo |
| 2 | + |
| 3 | +from nacos import NacosClient |
| 4 | +from nacos.timer import NacosTimer, NacosTimerManager |
| 5 | + |
| 6 | +from dubbo.constants import common_constants, registry_constants |
| 7 | +from dubbo.registry import NotifyListener, Registry, RegistryFactory |
| 8 | +from dubbo.url import URL |
| 9 | +from dubbo.loggers import loggerFactory |
| 10 | + |
| 11 | +_LOGGER = loggerFactory.get_logger() |
| 12 | + |
| 13 | +DEFAULT_APPLICATION = "DEFAULT" |
| 14 | + |
| 15 | + |
| 16 | +class NacosSubscriber: |
| 17 | + """ |
| 18 | + Nacos instance subscriber |
| 19 | + """ |
| 20 | + |
| 21 | + def __init__( |
| 22 | + self, nacos_client: NacosClient, service_name: str, listener: NotifyListener |
| 23 | + ): |
| 24 | + self._nacos_client = nacos_client |
| 25 | + self._service_name = service_name |
| 26 | + self._listener = listener |
| 27 | + self._timer_manager = NacosTimerManager() |
| 28 | + self._subscribed = False |
| 29 | + |
| 30 | + def refresh_instances(self): |
| 31 | + """ |
| 32 | + Refresh nacos instances |
| 33 | + """ |
| 34 | + if not self._subscribed: |
| 35 | + return |
| 36 | + |
| 37 | + try: |
| 38 | + instances = self._nacos_client.list_naming_instance(self._service_name) |
| 39 | + hosts = instances["hosts"] |
| 40 | + urls = [ |
| 41 | + URL(scheme="tri", host=h["ip"], port=h["port"]) |
| 42 | + for h in hosts |
| 43 | + if h["enabled"] |
| 44 | + ] |
| 45 | + self._listener.notify(urls=urls) |
| 46 | + except Exception as e: |
| 47 | + _LOGGER.error("nacos subscriber refresh_instance failed: %s", e) |
| 48 | + |
| 49 | + def subscribe(self): |
| 50 | + """ |
| 51 | + Start timer to watch instances |
| 52 | + """ |
| 53 | + if not self._timer_manager.all_timers().get("refresh_instances"): |
| 54 | + self._timer_manager.add_timer( |
| 55 | + NacosTimer("refresh_instances", self.refresh_instances, interval=7) |
| 56 | + ) |
| 57 | + self._timer_manager.execute() |
| 58 | + self._subscribed = True |
| 59 | + self.refresh_instances() |
| 60 | + |
| 61 | + def unsubscribe(self): |
| 62 | + self._subscribed = False |
| 63 | + |
| 64 | + |
| 65 | +def _init_nacos_client(url: URL) -> NacosClient: |
| 66 | + server_address = f"{url.host}:{url.port if url.port else 8848}" |
| 67 | + parameters = url.parameters |
| 68 | + |
| 69 | + endpoint = parameters.get("endpoint") |
| 70 | + namespace = parameters.get(registry_constants.NAMESPACE) |
| 71 | + username = url.username |
| 72 | + password = url.password |
| 73 | + |
| 74 | + return NacosClient( |
| 75 | + server_addresses=server_address, |
| 76 | + endpoint=endpoint, |
| 77 | + namespace=namespace, |
| 78 | + username=username, |
| 79 | + password=password, |
| 80 | + ) |
| 81 | + |
| 82 | + |
| 83 | +def _build_nacos_service_name(url: URL): |
| 84 | + service_name = url.parameters.get(common_constants.SERVICE_KEY) |
| 85 | + return f"providers:{service_name}::" |
| 86 | + |
| 87 | + |
| 88 | +class NacosRegistry(Registry): |
| 89 | + |
| 90 | + def __init__(self, url: URL): |
| 91 | + self._url = url |
| 92 | + self._nacos_client: NacosClient = _init_nacos_client(url) |
| 93 | + self._service_subscriber_mapping = {} |
| 94 | + |
| 95 | + def _service_subscriber( |
| 96 | + self, service_name: str, listener: NotifyListener |
| 97 | + ) -> NacosSubscriber: |
| 98 | + if service_name not in self._service_subscriber_mapping: |
| 99 | + self._service_subscriber_mapping[service_name] = NacosSubscriber( |
| 100 | + self._nacos_client, service_name=service_name, listener=listener |
| 101 | + ) |
| 102 | + |
| 103 | + return self._service_subscriber_mapping[service_name] |
| 104 | + |
| 105 | + def register(self, url: URL) -> None: |
| 106 | + ip = url.host |
| 107 | + port = url.port |
| 108 | + |
| 109 | + nacos_service_name = _build_nacos_service_name(url) |
| 110 | + |
| 111 | + metadata = { |
| 112 | + "side": "provider", |
| 113 | + "release": f"{dubbo.__version__}_py", |
| 114 | + "protocol": "tri", |
| 115 | + "application": DEFAULT_APPLICATION, |
| 116 | + "category": "providers", |
| 117 | + "enabled": "true", |
| 118 | + "disabled": "false", |
| 119 | + } |
| 120 | + self._nacos_client.add_naming_instance( |
| 121 | + nacos_service_name, |
| 122 | + ip, |
| 123 | + port, |
| 124 | + DEFAULT_APPLICATION, |
| 125 | + metadata=metadata, |
| 126 | + heartbeat_interval=1, |
| 127 | + ) |
| 128 | + |
| 129 | + def unregister(self, url: URL) -> None: |
| 130 | + ip = url.host |
| 131 | + port = url.port |
| 132 | + nacos_service_name = _build_nacos_service_name(url) |
| 133 | + |
| 134 | + self._nacos_client.remove_naming_instance( |
| 135 | + nacos_service_name, ip=ip, port=port, cluster_name=DEFAULT_APPLICATION |
| 136 | + ) |
| 137 | + |
| 138 | + def subscribe(self, url: URL, listener: NotifyListener) -> None: |
| 139 | + nacos_service_name = _build_nacos_service_name(url) |
| 140 | + |
| 141 | + subscriber = self._service_subscriber(nacos_service_name, listener) |
| 142 | + subscriber.subscribe() |
| 143 | + |
| 144 | + def unsubscribe(self, url: URL, listener: NotifyListener) -> None: |
| 145 | + nacos_service_name = _build_nacos_service_name(url) |
| 146 | + |
| 147 | + subscriber = self._service_subscriber(nacos_service_name, listener) |
| 148 | + subscriber.unsubscribe() |
| 149 | + listener.notify([]) |
| 150 | + |
| 151 | + def lookup(self, url: URL): |
| 152 | + pass |
| 153 | + |
| 154 | + def get_url(self) -> URL: |
| 155 | + return self._url |
| 156 | + |
| 157 | + def is_available(self) -> bool: |
| 158 | + return self._nacos_client is not None |
| 159 | + |
| 160 | + def destroy(self) -> None: |
| 161 | + pass |
| 162 | + |
| 163 | + |
| 164 | +class NacosRegistryFactory(RegistryFactory): |
| 165 | + |
| 166 | + def get_registry(self, url: URL) -> Registry: |
| 167 | + return NacosRegistry(url) |
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