eventlet.support package
************************


Submodules
==========


eventlet.support.greendns module
================================

greendns - non-blocking DNS support for Eventlet

class eventlet.support.greendns.HostsAnswer(qname, rdtype, rdclass, rrset, raise_on_no_answer=True)

   Bases: "Answer"

   Answer class for HostsResolver object

class eventlet.support.greendns.HostsResolver(fname=None, interval=10.0)

   Bases: "object"

   Class to parse the hosts file


   Attributes
   ----------

   fname:
      The filename of the hosts file in use.

   interval:
      The time between checking for hosts file modification

   LINES_RE = re.compile('\n        \\s*  # Leading space\n        ([^\\r\\n#]*?)  # The actual match, non-greedy so as not to include trailing space\n        \\s*  # Trailing space\n        (?:[#][^\\r\\n]+)?  # Comments\n  , re.VERBOSE)

   getaliases(hostname)

      Return a list of all the aliases of a given cname

   query(qname, rdtype=RdataType.A, rdclass=RdataClass.IN, tcp=False, source=None, raise_on_no_answer=True)

      Query the hosts file

      The known rdtypes are dns.rdatatype.A, dns.rdatatype.AAAA and
      dns.rdatatype.CNAME.

      The "rdclass" parameter must be dns.rdataclass.IN while the
      "tcp" and "source" parameters are ignored.

      Return a HostAnswer instance or raise a dns.resolver.NoAnswer
      exception.

class eventlet.support.greendns.ResolverProxy(hosts_resolver=None, filename='/etc/resolv.conf')

   Bases: "object"

   Resolver class which can also use /etc/hosts

   Initialise with a HostsResolver instance in order for it to also
   use the hosts file.

   clear()

   getaliases(hostname)

      Return a list of all the aliases of a given hostname

   query(qname, rdtype=RdataType.A, rdclass=RdataClass.IN, tcp=False, source=None, raise_on_no_answer=True, _hosts_rdtypes=(RdataType.A, RdataType.AAAA), use_network=True)

      Query the resolver, using /etc/hosts if enabled.

      Behavior: 1. if hosts is enabled and contains answer, return it
      now 2. query nameservers for qname if use_network is True 3. if
      qname did not contain dots, pretend it was top-level domain,

         query "foobar." and append to previous result

eventlet.support.greendns.compute_expiration(query, timeout)

eventlet.support.greendns.getaddrinfo(host, port, family=0, type=0, proto=0, flags=0)

   Replacement for Python's socket.getaddrinfo

   This does the A and AAAA lookups asynchronously after which it
   calls the OS' getaddrinfo(3) using the AI_NUMERICHOST flag.  This
   flag ensures getaddrinfo(3) does not use the network itself and
   allows us to respect all the other arguments like the native OS.

eventlet.support.greendns.getaliases(host)

   Return a list of for aliases for the given hostname

   This method does translate the dnspython exceptions into
   socket.gaierror exceptions.  If no aliases are available an empty
   list will be returned.

eventlet.support.greendns.gethostbyname(hostname)

   Replacement for Python's socket.gethostbyname

eventlet.support.greendns.gethostbyname_ex(hostname)

   Replacement for Python's socket.gethostbyname_ex

eventlet.support.greendns.getnameinfo(sockaddr, flags)

   Replacement for Python's socket.getnameinfo.

   Currently only supports IPv4.

eventlet.support.greendns.is_ip_addr(host)

   Return True if host is a valid IPv4 or IPv6 address

eventlet.support.greendns.is_ipv4_addr(host)

   Return True if host is a valid IPv4 address

eventlet.support.greendns.is_ipv6_addr(host)

   Return True if host is a valid IPv6 address

eventlet.support.greendns.reset()

eventlet.support.greendns.resolve(name, family=AddressFamily.AF_INET, raises=True, _proxy=None, use_network=True)

   Resolve a name for a given family using the global resolver proxy.

   This method is called by the global getaddrinfo() function. If
   use_network is False, only resolution via hosts file will be
   performed.

   Return a dns.resolver.Answer instance.  If there is no answer it's
   rrset will be emtpy.

eventlet.support.greendns.resolve_cname(host)

   Return the canonical name of a hostname

eventlet.support.greendns.tcp(q, where, timeout=10.0, port=53, af=None, source=None, source_port=0, one_rr_per_rrset=False, ignore_trailing=False, sock=None)

   coro friendly replacement for dns.query.tcp Return the response
   obtained after sending a query via TCP.

   @param q: the query @type q: dns.message.Message object @param
   where: where to send the message @type where: string containing an
   IPv4 or IPv6 address @param timeout: The number of seconds to wait
   before the query times out. If None, the default, wait forever.
   @type timeout: float @param port: The port to which to send the
   message.  The default is 53. @type port: int @param af: the address
   family to use.  The default is None, which causes the address
   family to use to be inferred from the form of of where. If the
   inference attempt fails, AF_INET is used. @type af: int @rtype:
   dns.message.Message object @param source: source address.  The
   default is the IPv4 wildcard address. @type source: string @param
   source_port: The port from which to send the message. The default
   is 0. @type source_port: int @type ignore_unexpected: bool @param
   one_rr_per_rrset: If True, put each RR into its own RRset. @type
   one_rr_per_rrset: bool @param ignore_trailing: If True, ignore
   trailing junk at end of the received message. @type
   ignore_trailing: bool @param sock: the socket to use for the query.
   If None, the default, a socket is created.  Note that if a socket
   is provided, it must be a nonblocking datagram socket, and the
   source and source_port are ignored. @type sock: socket.socket |
   None

eventlet.support.greendns.udp(q, where, timeout=10.0, port=53, af=None, source=None, source_port=0, ignore_unexpected=False, one_rr_per_rrset=False, ignore_trailing=False, raise_on_truncation=False, sock=None, ignore_errors=False)

   coro friendly replacement for dns.query.udp Return the response
   obtained after sending a query via UDP.

   @param q: the query @type q: dns.message.Message @param where:
   where to send the message @type where: string containing an IPv4 or
   IPv6 address @param timeout: The number of seconds to wait before
   the query times out. If None, the default, wait forever. @type
   timeout: float @param port: The port to which to send the message.
   The default is 53. @type port: int @param af: the address family to
   use.  The default is None, which causes the address family to use
   to be inferred from the form of of where. If the inference attempt
   fails, AF_INET is used. @type af: int @rtype: dns.message.Message
   object @param source: source address.  The default is the IPv4
   wildcard address. @type source: string @param source_port: The port
   from which to send the message. The default is 0. @type
   source_port: int @param ignore_unexpected: If True, ignore
   responses from unexpected sources.  The default is False. @type
   ignore_unexpected: bool @param one_rr_per_rrset: If True, put each
   RR into its own RRset. @type one_rr_per_rrset: bool @param
   ignore_trailing: If True, ignore trailing junk at end of the
   received message. @type ignore_trailing: bool @param
   raise_on_truncation: If True, raise an exception if the TC bit is
   set. @type raise_on_truncation: bool @param sock: the socket to use
   for the query.  If None, the default, a socket is created.  Note
   that if a socket is provided, it must be a nonblocking datagram
   socket, and the source and source_port are ignored. @type sock:
   socket.socket | None @param ignore_errors: if various format errors
   or response mismatches occur, continue listening. @type
   ignore_errors: bool


eventlet.support.greenlets module
=================================


eventlet.support.psycopg2_patcher module
========================================


eventlet.support.pylib module
=============================


eventlet.support.stacklesspypys module
======================================


eventlet.support.stacklesss module
==================================


Module contents
===============

eventlet.support.bytes_to_str(b, encoding='ascii')

eventlet.support.get_errno(exc)

   Get the error code out of socket.error objects. socket.error in
   <2.5 does not have errno attribute socket.error in 3.x does not
   allow indexing access e.args[0] works for all. There are cases when
   args[0] is not errno. i.e. http://bugs.python.org/issue6471 Maybe
   there are cases when errno is set, but it is not the first
   argument?

eventlet.support.wrap_deprecated(old, new)
