/usr/lib/python2.7/dist-packages/imposm/parser/xml/multiproc.py is in python-imposm-parser 1.0.7+ds-4.
This file is owned by root:root, with mode 0o644.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import mmap
import multiprocessing
import re
from Queue import Empty
from imposm.parser.xml.parser import XMLParser
from imposm.parser.util import setproctitle
KiB = 1024
MiB = 1024*KiB
READ_SIZE = 512*KiB
class MMapReader(object):
def __init__(self, m, size):
self.m = m
self.m.seek(0)
self.size = size
def read(self, size=None):
if size is None:
size = self.size - self.m.tell()
else:
size = min(self.size - self.m.tell(), size)
return self.m.read(size)
def readline(self):
cur_pos = self.m.tell()
if cur_pos >= self.size:
return
nl_pos = self.m.find('\n')
self.m.seek(cur_pos)
return self.m.read(nl_pos-cur_pos)
def seek(self, n):
self.m.seek(n)
class XMLParserProcess(XMLParser, multiprocessing.Process):
def __init__(self, mmap_pool, mmap_queue, *args, **kw):
multiprocessing.Process.__init__(self)
XMLParser.__init__(self, *args, **kw)
self.daemon = True
self.mmap_pool = mmap_pool
self.mmap_queue = mmap_queue
def run(self):
setproctitle('imposm xml parser')
while True:
mmap_idx, size = self.mmap_queue.get()
if mmap_idx is None:
self.mmap_queue.task_done()
break
xml = MMapReader(self.mmap_pool.get(mmap_idx), size)
self.parse(xml)
self.mmap_queue.task_done()
self.mmap_pool.free(mmap_idx)
class XMLMultiProcParser(object):
nodes_tag_filter = None
ways_tag_filter = None
relations_tag_filter = None
def __init__(self, pool_size, nodes_queue=None, ways_queue=None,
relations_queue=None, coords_queue=None, marshal_elem_data=False):
self.pool_size = pool_size
self.pool = []
self.nodes_callback = nodes_queue.put if nodes_queue else None
self.ways_callback = ways_queue.put if ways_queue else None
self.relations_callback = relations_queue.put if relations_queue else None
self.coords_callback = coords_queue.put if coords_queue else None
xml_chunk_size=READ_SIZE
self.mmap_pool = MMapPool(pool_size*8, xml_chunk_size*8)
self.mmap_queue = multiprocessing.JoinableQueue(8)
self.marshal_elem_data = marshal_elem_data
def parse(self, stream):
assert not self.pool
for _ in xrange(self.pool_size):
proc = XMLParserProcess(self.mmap_pool, self.mmap_queue, nodes_callback=self.nodes_callback,
coords_callback=self.coords_callback, ways_callback=self.ways_callback,
relations_callback=self.relations_callback,
nodes_tag_filter=self.nodes_tag_filter,
ways_tag_filter=self.ways_tag_filter,
relations_tag_filter=self.relations_tag_filter,
marshal_elem_data=self.marshal_elem_data,
)
self.pool.append(proc)
proc.start()
chunker = XMLChunker(stream, self.mmap_pool, xml_chunk_size=READ_SIZE)
chunker.read(self.mmap_queue, coords_callback=self.coords_callback)
self.mmap_queue.join()
for proc in self.pool:
self.mmap_queue.put((None, None))
for proc in self.pool:
proc.join()
class MMapPool(object):
"""
Manages multiple mmap files.
The mmap files can be read and written in different processes.
"""
def __init__(self, n, mmap_size):
self.n = n
self.mmap_size = mmap_size
self.pool = [mmap.mmap(-1, mmap_size) for _ in range(n)]
self.free_mmaps = set(range(n))
self.free_queue = multiprocessing.JoinableQueue()
def new(self):
"""
Return a free mmap file.
:returns: index, mmap file
"""
if not self.free_mmaps:
self.free_mmaps.add(self.free_queue.get())
self.free_queue.task_done()
while True:
# fetch unless free_queue is empty
try:
self.free_mmaps.add(self.free_queue.get_nowait())
self.free_queue.task_done()
except Empty:
break
mmap_idx = self.free_mmaps.pop()
return mmap_idx, self.pool[mmap_idx]
def join(self):
while len(self.free_mmaps) < self.n:
self.free_mmaps.add(self.free_queue.get())
self.free_queue.task_done()
def get(self, idx):
"""
Return mmap file with `idx`.
"""
return self.pool[idx]
def free(self, idx):
"""
Mark mmap file with `idx` as free.
"""
self.free_queue.put(idx)
class XMLChunker(object):
"""
Reads and chunks OSM XML file.
Reads OSM XML from `stream` and writes chunks of it into mmap files from
the `mmap_pool`.
:params xml_chunk_size: chunk XML after this many bytes
"""
def __init__(self, stream, mmap_pool, xml_chunk_size):
self.stream = stream
self.size = xml_chunk_size
self._last_line = None
self.mmap_pool = mmap_pool
self.current_mmap_idx = 0
self._skip_header()
def _skip_header(self):
for line in self.stream:
if line.lstrip().startswith('<node '):
self._last_line = line
return
def _new_xml_outstream(self):
self.current_mmap_idx, stream = self.mmap_pool.new()
stream.seek(0)
stream.write("<osm xmlns:xapi='http://www.informationfreeway.org/xapi/0.6'>")
return stream
def _finished_xml_outstream(self, last_line, stream):
if '</osm' not in last_line:
stream.write('</osm>\n')
return self.current_mmap_idx, stream.tell()
def read(self, mmaps_queue, coords_callback=None):
"""
Read and chunk all
"""
coord_node_match = None
xml_nodes = self._new_xml_outstream()
coords = []
coord_node_re_match = re.compile(r'^\s*<node id="(\d+)" .*lat="([-0-9.]+)" '
'lon="([-0-9.]+)".*/>').match
node_re_match = re.compile(r'^\s*<node .*/>').match
xml_nodes.write(self._last_line)
split = False
line = ''
for line in self.stream:
if coords_callback:
coord_node_match = coord_node_re_match(line)
if coord_node_match:
osm_id, lat, lon = coord_node_match.groups()
coords.append((int(osm_id), float(lon), float(lat)))
if len(coords) >= 512:
coords_callback(coords)
coords = []
else:
xml_nodes.write(line)
else:
xml_nodes.write(line)
if split:
if (line.rstrip().endswith(('</way>', '</node>', '</relation>'))
or (coords_callback and coord_node_match)
or (not coords_callback and node_re_match(line))):
mmaps_queue.put(self._finished_xml_outstream(line, xml_nodes))
xml_nodes = self._new_xml_outstream()
split = False
elif xml_nodes.tell() > self.size:
split = True
if coords_callback:
coords_callback(coords)
# we are at the end of the stream and assume we wrote the end tag
# to xml_nodes. we set line to closing tag here to avoid additional
# end tag in case the last line(s) is blank
line = '</osm'
mmaps_queue.put(self._finished_xml_outstream(line, xml_nodes))
if __name__ == '__main__':
import sys
def count_proc(type, queue):
def count():
count = 0
while True:
nodes = queue.get()
if nodes is None:
queue.task_done()
break
count += len(nodes)
queue.task_done()
print type, count
return count
nodes_queue = multiprocessing.JoinableQueue(128)
ways_queue = multiprocessing.JoinableQueue(128)
relations_queue = multiprocessing.JoinableQueue(128)
procs = [
multiprocessing.Process(target=count_proc('nodes', nodes_queue)),
multiprocessing.Process(target=count_proc('ways', ways_queue)),
multiprocessing.Process(target=count_proc('relations', relations_queue))
]
for proc in procs:
proc.start()
parser = XMLMultiProcParser(open(sys.argv[1]), 2, nodes_queue=nodes_queue,
ways_queue=ways_queue, relations_queue=relations_queue)
parser.start()
nodes_queue.put(None)
nodes_queue.join()
ways_queue.put(None)
ways_queue.join()
relations_queue.put(None)
relations_queue.join()
for proc in procs:
proc.join()
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