SF patch #761519: Fixes for bugs 760703 and 757821
SF bug #760703: SocketHandler and LogRecord don't work well together SF bug #757821: logging module docs Applied Vinay Sajip's patch with a few minor fixups and a NEWS item. Patched __init__.py - added new function makeLogRecord (for bug report 760703). Patched handlers.py - updated some docstrings and deleted some old commented-out code. Patched test_logging.py to make use of makeLogRecord. Patched liblogging.tex to fill documentation gaps (both 760703 and bug 757821).
This commit is contained in:
Raymond Hettinger
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6ebe61fa80
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6f3eaa67e5
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@ -52,7 +52,7 @@ use of \dfn{handlers}, which are instances of subclasses of the
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\class{Handler} class. Handlers are responsible for ensuring that a logged
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message (in the form of a \class{LogRecord}) ends up in a particular
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location (or set of locations) which is useful for the target audience for
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that message (e.g. end users, support desk staff, system administrators,
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that message (such as end users, support desk staff, system administrators,
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developers). Handlers are passed \class{LogRecord} instances intended for
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particular destinations. Each logger can have zero, one or more handlers
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associated with it (via the \method{addHandler} method of \class{Logger}).
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@ -204,6 +204,13 @@ with \var{lvl} is returned. Otherwise, the string "Level \%s" \% lvl is
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returned.
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\end{funcdesc}
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\begin{funcdesc}{makeLogRecord}{attrdict}
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Creates and returns a new \class{LogRecord} instance whose attributes are
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defined by \var{attrdict}. This function is useful for taking a pickled
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\class{LogRecord} attribute dictionary, sent over a socket, and reconstituting
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it as a \class{LogRecord} instance at the receiving end.
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\end{funcdesc}
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\begin{funcdesc}{basicConfig}{}
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Does basic configuration for the logging system by creating a
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\class{StreamHandler} with a default \class{Formatter} and adding it to
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@ -266,7 +273,7 @@ determined by \method{getEffectiveLevel()}.
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Indicates the effective level for this logger. If a value other than
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\constant{NOTSET} has been set using \method{setLevel()}, it is returned.
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Otherwise, the hierarchy is traversed towards the root until a value
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other than \constant{NOTSET} is found,and that value is returned.
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other than \constant{NOTSET} is found, and that value is returned.
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\end{methoddesc}
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\begin{methoddesc}{debug}{msg\optional{, *args\optional{, **kwargs}}}
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@ -535,9 +542,11 @@ Closes the socket.
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\end{methoddesc}
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\begin{methoddesc}{emit}{}
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Pickles the record and writes it to the socket in binary format.
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If there is an error with the socket, silently drops the packet.
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If the connection was previously lost, re-establishes the connection.
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Pickles the record's attribute dictionary and writes it to the socket in
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binary format. If there is an error with the socket, silently drops the
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packet. If the connection was previously lost, re-establishes the connection.
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To unpickle the record at the receiving end into a LogRecord, use the
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\function{makeLogRecord} function.
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\end{methoddesc}
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\begin{methoddesc}{handleError}{}
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@ -553,8 +562,8 @@ socket (\constant{socket.SOCK_STREAM}).
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\end{methoddesc}
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\begin{methoddesc}{makePickle}{record}
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Pickles the record in binary format with a length prefix, and returns
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it ready for transmission across the socket.
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Pickles the record's attribute dictionary in binary format with a length
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prefix, and returns it ready for transmission across the socket.
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\end{methoddesc}
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\begin{methoddesc}{send}{packet}
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@ -574,8 +583,11 @@ and \var{port}.
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\end{classdesc}
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\begin{methoddesc}{emit}{}
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Pickles the record and writes it to the socket in binary format.
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If there is an error with the socket, silently drops the packet.
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Pickles the record's attribute dictionary and writes it to the socket in
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binary format. If there is an error with the socket, silently drops the
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packet.
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To unpickle the record at the receiving end into a LogRecord, use the
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\function{makeLogRecord} function.
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\end{methoddesc}
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\begin{methoddesc}{makeSocket}{}
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@ -584,8 +596,7 @@ a UDP socket (\constant{socket.SOCK_DGRAM}).
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\end{methoddesc}
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\begin{methoddesc}{send}{s}
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Send a pickled string to a socket. This function allows for
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partial sends which can happen when the network is busy.
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Send a pickled string to a socket.
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\end{methoddesc}
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\subsubsection{SysLogHandler}
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@ -789,8 +800,8 @@ base
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supplied, the default value of "\%s(message)\\n" is used.
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A Formatter can be initialized with a format string which makes use of
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knowledge of the \class{LogRecord} attributes - e.g. the default value
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mentioned above makes use of the fact that the user's message and
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knowledge of the \class{LogRecord} attributes - such as the default value
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mentioned above making use of the fact that the user's message and
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arguments are pre- formatted into a LogRecord's \var{message}
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attribute. Currently, the useful attributes in a LogRecord are
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described by:
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@ -916,7 +927,11 @@ I/O.
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\subsubsection{Configuration functions}
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The following functions allow the logging module to be configured.
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The following functions allow the logging module to be configured. Before
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they can be used, you must import \module{logging.config}. Their use is optional -
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you can configure the logging module entirely by making calls to the main
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API (defined in \module{logging} itself) and defining handlers which are declared
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either in \module{logging} or \module{logging.handlers}.
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\begin{funcdesc}{fileConfig}{fname\optional{, defaults}}
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Reads the logging configuration from a ConfigParser-format file named
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@ -1013,7 +1028,7 @@ entry is set to 1 to indicate that messages must propagate to handlers
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higher up the logger hierarchy from this logger, or 0 to indicate that
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messages are \strong{not} propagated to handlers up the hierarchy. The
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\code{qualname} entry is the hierarchical channel name of the logger,
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i.e. the name used by the application to get the logger.
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for example, the name used by the application to get the logger.
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Sections which specify handler configuration are exemplified by the
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following.
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@ -36,8 +36,8 @@ except ImportError:
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__author__ = "Vinay Sajip <vinay_sajip@red-dove.com>"
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__status__ = "beta"
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__version__ = "0.4.8"
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__date__ = "22 April 2003"
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__version__ = "0.4.8.1"
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__date__ = "26 June 2003"
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#---------------------------------------------------------------------------
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# Miscellaneous module data
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@ -233,6 +233,17 @@ class LogRecord:
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msg = msg % self.args
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return msg
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def makeLogRecord(dict):
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"""
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Make a LogRecord whose attributes are defined by the specified dictionary,
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This function is useful for converting a logging event received over
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a socket connection (which is sent as a dictionary) into a LogRecord
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instance.
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"""
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rv = LogRecord(None, None, "", 0, "", (), None)
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rv.__dict__.update(dict)
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return rv
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#---------------------------------------------------------------------------
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# Formatter classes and functions
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#---------------------------------------------------------------------------
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@ -111,8 +111,12 @@ class SocketHandler(logging.Handler):
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A handler class which writes logging records, in pickle format, to
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a streaming socket. The socket is kept open across logging calls.
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If the peer resets it, an attempt is made to reconnect on the next call.
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Note that the very simple wire protocol used means that packet sizes
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are expected to be encodable within 16 bits (i.e. < 32767 bytes).
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The pickle which is sent is that of the LogRecord's attribute dictionary
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(__dict__), so that the receiver does not need to have the logging module
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installed in order to process the logging event.
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To unpickle the record at the receiving end into a LogRecord, use the
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makeLogRecord function.
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"""
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def __init__(self, host, port):
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@ -208,9 +212,12 @@ class SocketHandler(logging.Handler):
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class DatagramHandler(SocketHandler):
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"""
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A handler class which writes logging records, in pickle format, to
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a datagram socket. Note that the very simple wire protocol used means
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that packet sizes are expected to be encodable within 16 bits
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(i.e. < 32767 bytes).
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a datagram socket. The pickle which is sent is that of the LogRecord's
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attribute dictionary (__dict__), so that the receiver does not need to
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have the logging module installed in order to process the logging event.
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To unpickle the record at the receiving end into a LogRecord, use the
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makeLogRecord function.
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"""
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def __init__(self, host, port):
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@ -236,14 +243,6 @@ class DatagramHandler(SocketHandler):
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when the network is busy - UDP does not guarantee delivery and
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can deliver packets out of sequence.
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"""
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#old code
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#sentsofar = 0
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#left = len(s)
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#addr = (self.host, self.port)
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#while left > 0:
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# sent = self.sock.sendto(s[sentsofar:], addr)
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# sentsofar = sentsofar + sent
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# left = left - sent
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self.sock.sendto(s, (self.host, self.port))
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class SysLogHandler(logging.Handler):
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@ -70,8 +70,7 @@ class LogRecordStreamHandler(StreamRequestHandler):
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while len(chunk) < slen:
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chunk = chunk + self.connection.recv(slen - len(chunk))
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obj = self.unPickle(chunk)
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record = logging.LogRecord(None, None, "", 0, "", (), None)
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record.__dict__.update(obj)
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record = logging.makeLogRecord(obj)
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self.handleLogRecord(record)
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except:
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raise
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@ -83,6 +83,9 @@ Extension modules
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Library
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-------
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- The logging module now has a new function, makeLogRecord() making
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LogHandler easier to interact with DatagramHandler and SocketHandler.
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- For compatibility with doctests created before 2.3, if an expected
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output block consists solely of "1" and the actual output block
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consists solely of "True", it's accepted as a match; similarly
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