获取性能统计信息

以下代码片段提供了用于认证用户会话，获取统计信息文件列表以及下载个别计算的统计信息文件的参考。 在后面的部分中还使用示例代码来执行可从系统中拉取的各种类型度量的实际计算。

import re
import xml.etree.ElementTree as ET
import requests
import json
import pprint
 
def get_token(url, username, password):
    response = requests.post(
        url + "/auth", 
        headers={"X-Auth-Username": username, "X-Auth-Password": password}, 
        verify=False)
    return response.json()['token']
 
def get_namespace(element):
    m = re.match(r'\{.*\}', element.tag)
    return m.group(0) if m else ''
 
def get_directory_listing(url, token):
    response = requests.post(
        url + "/lsdumps", 
        json={"prefix": "/dumps/iostats"}, 
        headers={"X-Auth-Token": token}, 
        verify=False)
    if response.status_code != 200:
        raise Exception("Invalid directory listing") 
    return response.json()
 
def get_file_contents(url, token, filename):
    response = requests.post(
        url + "/download", 
        json={"prefix": "/dumps/iostats", "filename": filename}, 
        headers={"X-Auth-Token": token}, 
        verify=False)
    if response.status_code != 200:
        raise Exception("File not found") 
    return response.content
    
def get_latest_stats(url, username, password):
    token = get_token(url, username, password)
    files = [row['filename'] for row in get_directory_listing(url, token)]
    nm_files = [name for name in files if re.match("Nm_stats", name)]
    nv_files = [name for name in files if re.match("Nv_stats", name)]
    ng_files = [name for name in files if re.match("Ng_stats", name)]
    nn_files = [name for name in files if re.match("Nn_stats", name)]
    nd_files = [name for name in files if re.match("Nd_stats", name)]
    
    nm_xml = ET.fromstring(get_file_contents(url, token, nm_files[0]))
    nv_xml = ET.fromstring(get_file_contents(url, token, nv_files[0]))
    ng_xml = ET.fromstring(get_file_contents(url, token, ng_files[0]))
    nn_xml = ET.fromstring(get_file_contents(url, token, nn_files[0]))
    nd_xml = ET.fromstring(get_file_contents(url, token, nd_files[0]))
 
    xml = {
        "Nm_stats": nm_xml,
        "Nv_stats": nv_xml,
        "Ng_stats": ng_xml,
        "Nn_stats": nn_xml,
        "Nd_stats": nd_xml
    }
    return xml
 
def populate_fields(xml, fields):
    for item in fields.items():
        item[1]['value'] = int(
            xml[item[1]['filename']].
            find(get_namespace(xml[item[1]['filename']]) + item[1]['element']).
            attrib[item[1]['field']]
        )