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mitogen/docs/internals.rst

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Internal API Reference
**********************
mitogen.core
============
Side Class
----------
.. currentmodule:: mitogen.core
.. autoclass:: Side
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:members:
Stream Classes
--------------
.. currentmodule:: mitogen.core
.. autoclass:: BasicStream
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.. autoclass:: Stream
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.. currentmodule:: mitogen.master
.. autoclass:: Stream
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.. currentmodule:: mitogen.ssh
.. autoclass:: Stream
:members:
.. currentmodule:: mitogen.sudo
.. autoclass:: Stream
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Other Stream Subclasses
-----------------------
.. currentmodule:: mitogen.core
.. autoclass:: IoLogger
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.. autoclass:: Waker
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ExternalContext Class
---------------------
.. currentmodule:: mitogen.core
.. class:: ExternalContext
External context implementation.
.. attribute:: broker
The :py:class:`mitogen.core.Broker` instance.
.. attribute:: context
The :py:class:`mitogen.core.Context` instance.
.. attribute:: channel
The :py:class:`mitogen.core.Channel` over which
:py:data:`CALL_FUNCTION` requests are received.
.. attribute:: stdout_log
The :py:class:`mitogen.core.IoLogger` connected to ``stdout``.
.. attribute:: importer
The :py:class:`mitogen.core.Importer` instance.
.. attribute:: stdout_log
The :py:class:`IoLogger` connected to ``stdout``.
.. attribute:: stderr_log
The :py:class:`IoLogger` connected to ``stderr``.
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mitogen.master
==============
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.. currentmodule:: mitogen.master
.. class:: ProcessMonitor
Install a :py:data:`signal.SIGCHLD` handler that generates callbacks when a
specific child process has exitted.
.. method:: add (pid, callback)
Add a callback function to be notified of the exit status of a process.
:param int pid:
Process ID to be notified of.
:param callback:
Function invoked as `callback(status)`, where `status` is the raw
exit status of the child process.
Blocking I/O Functions
----------------------
These functions exist to support the blocking phase of setting up a new
context. They will eventually be replaced with asynchronous equivalents.
.. currentmodule:: mitogen.master
.. function:: iter_read(fd, deadline=None)
Return a generator that arranges for up to 4096-byte chunks to be read at a
time from the file descriptor `fd` until the generator is destroyed.
:param fd:
File descriptor to read from.
:param deadline:
If not ``None``, an absolute UNIX timestamp after which timeout should
occur.
:raises mitogen.core.TimeoutError:
Attempt to read beyond deadline.
:raises mitogen.core.StreamError:
Attempt to read past end of file.
.. currentmodule:: mitogen.master
.. function:: write_all (fd, s, deadline=None)
Arrange for all of bytestring `s` to be written to the file descriptor
`fd`.
:param int fd:
File descriptor to write to.
:param bytes s:
Bytestring to write to file descriptor.
:param float deadline:
If not ``None``, an absolute UNIX timestamp after which timeout should
occur.
:raises mitogen.core.TimeoutError:
Bytestring could not be written entirely before deadline was exceeded.
:raises mitogen.core.StreamError:
File descriptor was disconnected before write could complete.
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Helper Functions
----------------
.. currentmodule:: mitogen.core
.. function:: io_op (func, \*args)
When connected over a TTY (i.e. sudo), disconnection of the remote end is
signalled by EIO, rather than an empty read like sockets or pipes. Ideally
this will be replaced later by a 'goodbye' message to avoid reading from a
disconnected endpoint, allowing for more robust error reporting.
When connected over a socket (e.g. mitogen.master.create_child()),
ECONNRESET may be triggered by any read or write.
.. currentmodule:: mitogen.master
.. function:: create_child (\*args)
Create a child process whose stdin/stdout is connected to a socket,
returning `(pid, socket_obj)`.
.. currentmodule:: mitogen.master
.. function:: tty_create_child (\*args)
Return a file descriptor connected to the master end of a pseudo-terminal,
whose slave end is connected to stdin/stdout/stderr of a new child process.
The child is created such that the pseudo-terminal becomes its controlling
TTY, ensuring access to /dev/tty returns a new file descriptor open on the
slave end.
:param list args:
:py:func:`os.execl` argument list.
:returns:
`(pid, fd)`
.. currentmodule:: mitogen.master
.. function:: get_child_modules (path, fullname)
Return the canonical names of all submodules of a package `module`.
:param str path:
Path to the module's source code on disk, or some PEP-302-recognized
equivalent. Usually this is the module's ``__file__`` attribute, but
is specified explicitly to avoid loading the module.
:param str fullname:
The module's canonical name. This is the module's ``__name__``
attribute, but is specified explicitly to avoid loading the module.
:return:
List of canonical submodule names.
.. currentmodule:: mitogen.master
.. autofunction:: minimize_source (source)
Remove comments and docstrings from Python `source`, preserving line
numbers and syntax of empty blocks.
:param str source:
The source to minimize.
:returns str:
The minimized source.