Python client for Nacos.
Project description
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
# 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
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, useDEFAULT_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.
- Failover dir can be manually copied from snapshot dir(default:
-
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, useDEFAULT_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 formatparam
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, defaultblank
.param
group_name Customized group name , defaultDEFAULT_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, defaultblank
.param
group_name Customized group name , defaultDEFAULT_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
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