使用pythonSDK停止OpenStack服务器实例

问题描述

我正在尝试创建一个端点来使用pythonSDK停止我的openstasck服务器实例，但是当我尝试访问/ stop_server时遇到错误，您能帮我吗？

from flask import Flask,request
from openstack import connection
from pprint import pprint
import json
import os

app = Flask(__name__)
# Source the openstack project rc file before running this app,to create the
# environment variables needed
conn = connection.Connection(auth_url=os.environ['OS_AUTH_URL'],project_name=os.environ['OS_PROJECT_NAME'],username=os.environ['OS_USERNAME'],password=os.environ['OS_PASSWORD'],user_domain_id="default",project_domain_id=os.environ['OS_PROJECT_DOMAIN_ID'])


@app.route("/")
def hello():
    return "Hello from Flask!"


@app.route("/list")
def list_openstack_resources():
    # Check if connection is established
    print("conn: ",conn)

    # Print list of servers,images,flavors,endpoints,projects,users
    server_list = list(conn.compute.servers())
    image_list = list(conn.compute.images())
    flavor_list = list(conn.compute.flavors())
    project_list = list(conn.identity.projects())
    user_list = list(conn.identity.users())
    pprint(server_list)
    pprint(image_list)
    pprint(flavor_list)
    pprint(project_list)
    pprint(user_list)
    return "List printed to stdout"


@app.route("/create_server")
def create_server():
    # Check if connection is established
    print("conn: ",conn)

    # Create the volume first
    volume_size = request.args.get('volume_size')
    print("Starting to create volume with size (in GiB): ",volume_size)
    volume = conn.create_volume(size=volume_size,image="cirros-0.5.1-x86_64-disk",wait=True,bootable=True,)
    print("Create volume: ",json.dumps(volume))

    # Create the server using the server_name parameter in the GET request
    server_name = request.args.get('server_name')
    print("Starting to create the server with name: ",server_name)
    server = conn.create_server(name=server_name,flavor="m1.micro",terminate_volume=True,timeout=180,boot_volume=volume.id,key_name="test-app",network='shared'
                                )
    print("Created server: ",json.dumps(server))
    return "Server create request sent!"

@app.route("/stop_server")
def stop_server():
    for server in conn.compute.servers():
        print(json.dumps(server))



@app.route("/delete_server")
def delete_server():
    print("delete: ",conn)
    server_id = request.args.get('server_id')
    delete_server = conn.delete_server(name=server_id,ignore_missing=False,force=False)
    print('removed',json.dumps(delete_server))


if __name__ == "__main__":
    app.run(debug=True,host='0.0.0.0',port=8080)

我收到此错误：

TypeError

TypeError：视图函数未返回有效响应。该函数返回None或不返回return语句结束。

解决方法

在技术client-server中，当client发送request时，server应该发送回response。

但是在功能stop_server()和delete_server()中，您既不使用return text也不使用return render_template(...)也不使用return jsonify()也不使用return response(...)等-所以Python使用标准的return None（默认），而flask不知道向客户端发送什么-这会产生错误。

您应该至少发送一个空字符串return ""，或者更好地发送有关成功的信息。

@app.route("/stop_server")
def stop_server():
    # ... your code ...
    return "success"

@app.route("/delete_server")
def delete_server():
    # ... your code ...
    return "success"