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Python SDK Usage

Supported Python version：

  • Python 2.7
  • Python 3.6+

Supported Nacos version

  • Nacos 0.8.0+
  • Nacos 1.x
  • Nacos 2.x with http protocol

Installation

Terminal window
pip install nacos-sdk-python

Getting Started

import nacos


# Both HTTP/HTTPS protocols are supported, if not set protocol prefix default is HTTP, and HTTPS with no ssl check(verify=False)
# "192.168.3.4:8848" or "https://192.168.3.4:443" or "http://192.168.3.4:8848,192.168.3.5:8848" or "https://192.168.3.4:443,https://192.168.3.5:443"
SERVER_ADDRESSES = "server addresses split by comma"
NAMESPACE = "namespace id"


# no auth mode
client = nacos.NacosClient(SERVER_ADDRESSES, namespace=NAMESPACE)
# auth mode
#client = nacos.NacosClient(SERVER_ADDRESSES, namespace=NAMESPACE, ak="{ak}", sk="{sk}")


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

Configuration

client = NacosClient(server_addresses, namespace=your_ns, ak=your_ak, sk=your_sk)
  • server_addresses - required - Nacos server address, comma separated if more than 1.
  • namespace - Namespace. | default: None
  • ak - The accessKey to authenticate. | default: null
  • sk - The secretKey to authentication. | default: null
  • log_level - Log level. | default: null
  • log_rotation_backup_count - The number of log files to keep. | default: 7

Extra Options

Extra option can be set by set_options, as following:

client.set_options({key}={value})
# client.set_options(proxies={"http":"192.168.3.50:809"})

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,ephemeral,group_name,heartbeat_interval)

  • 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.
  • param heartbeat_interval Auto daemon heartbeat interval in seconds.
  • 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:

client = nacos.NacosClient(SERVER_ADDRESSES, namespace=NAMESPACE, username=USERNAME, password=PASSWORD,log_level="DEBUG")