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# Microsoft Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.4+ and Openssl 1.0+
#
import time
import azurelinuxagent.common.conf as conf
import azurelinuxagent.common.logger as logger
from azurelinuxagent.common.exception import HttpError
from azurelinuxagent.common.future import httpclient, urlparse
"""
REST api util functions
"""
RETRY_WAITING_INTERVAL = 3
secure_warning = True
def _parse_url(url):
o = urlparse(url)
rel_uri = o.path
if o.fragment:
rel_uri = "{0}#{1}".format(rel_uri, o.fragment)
if o.query:
rel_uri = "{0}?{1}".format(rel_uri, o.query)
secure = False
if o.scheme.lower() == "https":
secure = True
return o.hostname, o.port, secure, rel_uri
def get_http_proxy():
"""
Get http_proxy and https_proxy from environment variables.
Username and password is not supported now.
"""
host = conf.get_httpproxy_host()
port = conf.get_httpproxy_port()
return host, port
def _http_request(method, host, rel_uri, port=None, data=None, secure=False,
headers=None, proxy_host=None, proxy_port=None):
url, conn = None, None
if secure:
port = 443 if port is None else port
if proxy_host is not None and proxy_port is not None:
conn = httpclient.HTTPSConnection(proxy_host,
proxy_port,
timeout=10)
conn.set_tunnel(host, port)
# If proxy is used, full url is needed.
url = "https://{0}:{1}{2}".format(host, port, rel_uri)
else:
conn = httpclient.HTTPSConnection(host,
port,
timeout=10)
url = rel_uri
else:
port = 80 if port is None else port
if proxy_host is not None and proxy_port is not None:
conn = httpclient.HTTPConnection(proxy_host,
proxy_port,
timeout=10)
# If proxy is used, full url is needed.
url = "http://{0}:{1}{2}".format(host, port, rel_uri)
else:
conn = httpclient.HTTPConnection(host,
port,
timeout=10)
url = rel_uri
logger.verbose("HTTP connection [{0}] [{1}] [{2}] [{3}]",
method,
url,
data,
headers)
headers = {} if headers is None else headers
conn.request(method=method, url=url, body=data, headers=headers)
resp = conn.getresponse()
return resp
def http_request(method, url, data, headers=None, max_retry=3,
chk_proxy=False):
"""
Sending http request to server
On error, sleep 10 and retry max_retry times.
"""
host, port, secure, rel_uri = _parse_url(url)
global secure_warning
# Check proxy
proxy_host, proxy_port = (None, None)
if chk_proxy:
proxy_host, proxy_port = get_http_proxy()
# If httplib module is not built with ssl support. Fallback to http
if secure and not hasattr(httpclient, "HTTPSConnection"):
secure = False
if secure_warning:
logger.warn("httplib is not built with ssl support")
secure_warning = False
# If httplib module doesn't support https tunnelling. Fallback to http
if secure and proxy_host is not None and proxy_port is not None \
and not hasattr(httpclient.HTTPSConnection, "set_tunnel"):
secure = False
if secure_warning:
logger.warn("httplib does not support https tunnelling "
"(new in python 2.7)")
secure_warning = False
if proxy_host or proxy_port:
logger.verbose("HTTP proxy: [{0}:{1}]", proxy_host, proxy_port)
retry_msg = ''
log_msg = "HTTP {0}".format(method)
for retry in range(0, max_retry):
retry_interval = RETRY_WAITING_INTERVAL
try:
resp = _http_request(method,
host,
rel_uri,
port=port,
data=data,
secure=secure,
headers=headers,
proxy_host=proxy_host,
proxy_port=proxy_port)
logger.verbose("HTTP response status: [{0}]", resp.status)
return resp
except httpclient.HTTPException as e:
retry_msg = 'HTTP exception: {0} {1}'.format(log_msg, e)
retry_interval = 5
except IOError as e:
retry_msg = 'IO error: {0} {1}'.format(log_msg, e)
# error 101: network unreachable; when the adapter resets we may
# see this transient error for a short time, retry once.
if e.errno == 101:
retry_interval = RETRY_WAITING_INTERVAL
max_retry = 1
else:
retry_interval = 0
max_retry = 0
if retry < max_retry:
logger.info("Retry [{0}/{1} - {3}]",
retry+1,
max_retry,
retry_interval,
retry_msg)
time.sleep(retry_interval)
raise HttpError("{0} failed".format(log_msg))
def http_get(url, headers=None, max_retry=3, chk_proxy=False):
return http_request("GET", url, data=None, headers=headers,
max_retry=max_retry, chk_proxy=chk_proxy)
def http_head(url, headers=None, max_retry=3, chk_proxy=False):
return http_request("HEAD", url, None, headers=headers,
max_retry=max_retry, chk_proxy=chk_proxy)
def http_post(url, data, headers=None, max_retry=3, chk_proxy=False):
return http_request("POST", url, data, headers=headers,
max_retry=max_retry, chk_proxy=chk_proxy)
def http_put(url, data, headers=None, max_retry=3, chk_proxy=False):
return http_request("PUT", url, data, headers=headers,
max_retry=max_retry, chk_proxy=chk_proxy)
def http_delete(url, headers=None, max_retry=3, chk_proxy=False):
return http_request("DELETE", url, None, headers=headers,
max_retry=max_retry, chk_proxy=chk_proxy)
# End REST api util functions
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