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nacos-sdk-python

A Python implementation of Nacos OpenAPI.

see: https://nacos.io/zh-cn/docs/open-API.html

Supported Python version：

Python 2.7 Python 3.6 Python 3.7

Supported Nacos version

Nacos 0.8.0 ~ 1.3.2

Installation

pip install nacos-sdk-python

Getting Started

import nacos

SERVER_ADDRESSES = "server addresses split by comma"
NAMESPACE = "***"

# no auth mode
client = nacos.NacosClient(SERVER_ADDRESSES, namespace=NAMESPACE)
# auth mode
#client = nacos.NacosClient(SERVER_ADDRESSES, namespace=NAMESPACE, username="nacos", password="nacos")

# get config
data_id = "config.nacos"
group = "group"
print(client.get_config(data_id, group))

Configuration

client = NacosClient(server_addresses, namespace=your_ns)

• server_addresses - required - Nacos server address, comma separated if more than 1.
• namespace - Namespace. | default: None

Extra Options

Extra option can be set by set_options, as following:

client.set_options({key}={value})

Configurable options are:

• default_timeout - Default timeout for get config from server in seconds.
• pulling_timeout - Long polling timeout in seconds.
• pulling_config_size - Max config items number listened by one polling process.
• callback_thread_num - Concurrency for invoking callback.
• failover_base - Dir to store failover config files.
• snapshot_base - Dir to store snapshot config files.
• no_snapshot - To disable default snapshot behavior, this can be overridden by param no_snapshot in get method.
• proxies - Dict proxy mapping, some environments require proxy access, so you can set this parameter, this way http requests go through the proxy.

API Reference

Get Config

NacosClient.get_config(data_id, group, timeout, no_snapshot)

• param data_id Data id.
• param group Group, use DEFAULT_GROUP if no group specified.
• param timeout Timeout for requesting server in seconds.
• param no_snapshot Whether to use local snapshot while server is unavailable.
• return W Get value of one config item following priority:
• Step 1 - Get from local failover dir(default: ${cwd}/nacos-data/data).
  • Failover dir can be manually copied from snapshot dir(default: ${cwd}/nacos-data/snapshot) in advance.
  • This helps to suppress the effect of known server failure.
• Step 2 - Get from one server until value is got or all servers tried.
  • Content will be save to snapshot dir after got from server.
• Step 3 - Get from snapshot dir.

Add Watchers

NacosClient.add_config_watchers(data_id, group, cb_list)

• param data_id Data id.
• param group Group, use DEFAULT_GROUP if no group specified.
• param cb_list List of callback functions to add.
• return

Add watchers to a specified config item.

• Once changes or deletion of the item happened, callback functions will be invoked.
• If the item is already exists in server, callback functions will be invoked for once.
• Multiple callbacks on one item is allowed and all callback functions are invoked concurrently by threading.Thread.
• Callback functions are invoked from current process.

Remove Watcher

NacosClient.remove_config_watcher(data_id, group, cb, remove_all)

• param data_id Data id.
• param group Group, use "DEFAULT_GROUP" if no group specified.
• param cb Callback function to delete.
• param remove_all Whether to remove all occurrence of the callback or just once.
• return

Remove watcher from specified key.

Publish Config

NacosClient.publish_config(data_id, group, content, timeout)

• param data_id Data id.
• param group Group, use "DEFAULT_GROUP" if no group specified.
• param content Config value.
• param timeout Timeout for requesting server in seconds.
• return True if success or an exception will be raised.

Publish one data item to Nacos.

• If the data key is not exist, create one first.
• If the data key is exist, update to the content specified.
• Content can not be set to None, if there is need to delete config item, use function remove instead.

Remove Config

NacosClient.remove_config(data_id, group, timeout)

• param data_id Data id.
• param group Group, use "DEFAULT_GROUP" if no group specified.
• param timeout Timeout for requesting server in seconds.
• return True if success or an exception will be raised.

Remove one data item from Nacos.

Register Instance

NacosClient.add_naming_instance(service_name, ip, port, cluster_name, weight, metadata, enable, healthy)

• param service_name required Service name to register to.
• param ip required IP of the instance.
• param port required Port of the instance.
• param cluster_name Cluster to register to.
• param weight A float number for load balancing weight.
• param metadata Extra info in JSON string format or dict format
• param enable A bool value to determine whether instance is enabled or not.
• param healthy A bool value to determine whether instance is healthy or not.
• param ephemeral A bool value to determine whether instance is ephemeral or not.
• return True if success or an exception will be raised.

Deregister Instance

NacosClient.remove_naming_instance(service_name, ip, port, cluster_name)

• param service_name required Service name to deregister from.
• param ip required IP of the instance.
• param port required Port of the instance.
• param cluster_name Cluster to deregister from.
• param ephemeral A bool value to determine whether instance is ephemeral or not.
• return True if success or an exception will be raised.

Modify Instance

NacosClient.modify_naming_instance(service_name, ip, port, cluster_name, weight, metadata, enable)

• param service_name required Service name.
• param ip required IP of the instance.
• param port required Port of the instance.
• param cluster_name Cluster name.
• param weight A float number for load balancing weight.
• param metadata Extra info in JSON string format or dict format.
• param enable A bool value to determine whether instance is enabled or not.
• param ephemeral A bool value to determine whether instance is ephemeral or not.
• return True if success or an exception will be raised.

Query Instances

NacosClient.list_naming_instance(service_name, clusters, namespace_id, group_name, healthy_only)

• param service_name required Service name to query.
• param clusters Cluster names separated by comma.
• param namespace_id Customized group name, default blank.
• param group_name Customized group name , default DEFAULT_GROUP.
• param healthy_only A bool value for querying healthy instances or not.
• return Instance info list if success or an exception will be raised.

Query Instance Detail

NacosClient.get_naming_instance(service_name, ip, port, cluster_name)

• param service_name required Service name.
• param ip required IP of the instance.
• param port required Port of the instance.
• param cluster_name Cluster name.
• return Instance info if success or an exception will be raised.

Send Instance Beat

NacosClient.send_heartbeat(service_name, ip, port, cluster_name, weight, metadata)

• param service_name required Service name.
• param ip required IP of the instance.
• param port required Port of the instance.
• param cluster_name Cluster to register to.
• param weight A float number for load balancing weight.
• param ephemeral A bool value to determine whether instance is ephemeral or not.
• param metadata Extra info in JSON string format or dict format.
• return A JSON object include server recommended beat interval if success or an exception will be raised.

Subscribe Service Instances Changed

NacosClient.subscribe(listener_fn, listener_interval=7, *args, **kwargs)

• param listener_fn required Customized listener function.
• param listener_interval Listen interval , default 7 second.
• param service_name required Service name which subscribes.
• param clusters Cluster names separated by comma.
• param namespace_id Customized group name, default blank.
• param group_name Customized group name , default DEFAULT_GROUP.
• param healthy_only A bool value for querying healthy instances or not.
• return

Unsubscribe Service Instances Changed

NacosClient.unsubscribe(service_name, listener_name)

• param service_name required Service name to subscribed.
• param listener_name listener_name which is customized.
• return

Stop All Service Subscribe

NacosClient.stop_subscribe()

• return

Debugging Mode

Debugging mode if useful for getting more detailed log on console.

Debugging mode can be set by:

NacosClient.set_debugging()
# only effective within the current process