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jlog.pyx
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jlog.pyx
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# file: jlog.pyx
# encoding: utf-8
# Copyright (c) 2011 David Robinson
#
# This file is part of PyJlog.
#
# PyJLog is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# PyJLog is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with PyJlog. If not, see <http://www.gnu.org/licenses/>.
from cpython cimport PyString_FromStringAndSize
from cpython cimport PyString_AsStringAndSize
from cpython cimport PyString_AsString
cimport cjlog
BEGIN = cjlog.JLOG_BEGIN
END = cjlog.JLOG_END
class JLogError(Exception):
def __init__(self, num, msg):
self.num = num
self.msg = msg
def __str__(self):
return repr(self.num), repr(self.msg)
cdef class Reader:
cdef cjlog.jlog_ctx *_ctx
cdef cjlog.jlog_id begin
cdef cjlog.jlog_id end
cdef int empty
def __cinit__(self, path, reader):
self._ctx = cjlog.jlog_new(path)
if cjlog.jlog_ctx_open_reader(self._ctx, PyString_AsString(reader)) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
self.empty = 1
def __len__(self):
cdef cjlog.jlog_id begin
cdef cjlog.jlog_id end
return cjlog.jlog_ctx_read_interval(self._ctx, &begin, &end)
def __iter__(self):
return self
def __next__(self):
cdef cjlog.jlog_message jlog_msg
if self.empty:
if cjlog.jlog_ctx_read_interval(self._ctx, &self.begin, &self.end) > 0:
self.empty = 0
else:
raise StopIteration()
if self.begin.marker <= self.end.marker:
#print 'begin:', self.begin.marker
#print 'end:', self.end.marker
if (cjlog.jlog_ctx_read_message(self._ctx, &self.begin, &jlog_msg) == 0):
msg = PyString_FromStringAndSize(
<char *>jlog_msg.mess,
jlog_msg.mess_len)
#print msg
else:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
cjlog.JLOG_ID_ADVANCE(&self.begin)
return msg
else:
cjlog.jlog_ctx_read_checkpoint(self._ctx, &self.end)
self.empty = 1
self.__next__()
def __dealloc__(self):
if self._ctx is not NULL:
if cjlog.jlog_ctx_close(self._ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
self._ctx = NULL
@property
def will_checkpoint(self):
return self.begin.marker > self.end.marker
cdef class Writer:
cdef cjlog.jlog_ctx *_ctx
cdef char* path
def __cinit__(self, path):
self._ctx = cjlog.jlog_new(path)
self.path = path
# Create log
if cjlog.jlog_ctx_init(self._ctx) != 0:
if cjlog.jlog_ctx_err(self._ctx) != 6:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
if cjlog.jlog_ctx_close(self._ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
# Open writer
self._ctx = cjlog.jlog_new(path)
if cjlog.jlog_ctx_open_writer(self._ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
def write(self, msg):
cdef char *msg_c = NULL
cdef Py_ssize_t msg_len_c=0
PyString_AsStringAndSize(msg, &msg_c, &msg_len_c)
if cjlog.jlog_ctx_write(self._ctx, <void *>msg_c, msg_len_c) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
cpdef add_subscriber(self, subscriber, position):
cdef cjlog.jlog_ctx *ctx
ctx = cjlog.jlog_new(self.path)
if cjlog.jlog_ctx_add_subscriber(ctx, PyString_AsString(subscriber), position) != 0:
raise JLogError(cjlog.jlog_ctx_err(ctx), cjlog.jlog_ctx_err_string(ctx))
if cjlog.jlog_ctx_close(ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(ctx), cjlog.jlog_ctx_err_string(ctx))
cpdef remove_subscriber(self, subscriber):
cdef cjlog.jlog_ctx *ctx
ctx = cjlog.jlog_new(self.path)
if cjlog.jlog_ctx_remove_subscriber(ctx, PyString_AsString(subscriber)) != 1:
raise JLogError(cjlog.jlog_ctx_err(ctx), cjlog.jlog_ctx_err_string(ctx))
if cjlog.jlog_ctx_close(ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(ctx), cjlog.jlog_ctx_err_string(ctx))
def __dealloc__(self):
if self._ctx is not NULL:
if cjlog.jlog_ctx_close(self._ctx) != 0:
raise JLogError(cjlog.jlog_ctx_err(self._ctx), cjlog.jlog_ctx_err_string(self._ctx))
self._ctx = NULL