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�r�|dk�s�|d |k �r�|dk�r�|�r�tjd|� t#j$|� W Y dd} ~ X nX �q W |d �dS ) a� Wrapper around requests.Session to read the url and retry if necessary
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:param data: Optional form data to post the URL. Will set request_method
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:param timeout: Timeout in seconds to wait for a response. May be a tuple
if specifying (connection timeout, read timeout).
:param retries: Number of times to retry on exception if exception_cb is
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:param sec_between: Default 1: amount of seconds passed to time.sleep
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:param headers: Optional dict of headers to send during request
:param headers_cb: Optional callable returning a dict of values to send as
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:param headers_redact: Optional list of header names to redact from the log
:param ssl_details: Optional dict providing key_file, ca_certs, and
cert_file keys for use on in ssl connections.
:param check_status: Optional boolean set True to raise when HTTPError
occurs. Default: True.
:param allow_redirects: Optional boolean passed straight to Session.request
as 'allow_redirects'. Default: True.
:param exception_cb: Optional callable which accepts the params
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:param session: Optional exiting requests.Session instance to reuse.
:param infinite: Bool, set True to retry indefinitely. Default: False.
:param log_req_resp: Set False to turn off verbose debug messages.
:param request_method: String passed as 'method' to Session.request.
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timeout: the timeout provided to urlopen
status_cb: call method with string message when a url is not available
headers_cb: call method with single argument of url to get headers
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headers_redact: a list of header names to redact from the log
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request_method: indicate the type of HTTP request, GET, PUT, or POST
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async_delay: delay before parallel metadata requests, see RFC 6555
returns: tuple of (url, response contents), on failure, (False, None)
the idea of this routine is to wait for the EC2 metadata service to
come up. On both Eucalyptus and EC2 we have seen the case where
the instance hit the MD before the MD service was up. EC2 seems
to have permanently fixed this, though.
In openstack, the metadata service might be painfully slow, and
unable to avoid hitting a timeout of even up to 10 seconds or more
(LP: #894279) for a simple GET.
Offset those needs with the need to not hang forever (and block boot)
on a system where cloud-init is configured to look for EC2 Metadata
service but is not going to find one. It is possible that the instance
data host (169.254.169.254) may be firewalled off Entirely for a system,
meaning that the connection will block forever unless a timeout is set.
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