/usr/lib/python2.7/dist-packages/tilelite.py is in tilelite 0.1.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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__author__ = 'Dane Springmeyer (dbsgeo [ -a- ] gmail.com)'
__copyright__ = 'Copyright 2009, Dane Springmeyer'
__version__ = '0.1.5'
__license__ = 'BSD'
import os
#import re
import sys
import time
import math
import urllib
import tempfile
try:
import mapnik2 as mapnik
except ImportError:
import mapnik
# repair compatibility with mapnik2 development series
if not hasattr(mapnik,'Envelope'):
mapnik.Envelope = mapnik.Box2d
# http://spatialreference.org/ref/epsg/3785/proj4/
#"+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
# QGIS 3785
#"+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
# QGIS 4055
#"+proj=longlat +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +no_defs"
# proj's WGS 84 / Pseudo-Mercator <3857>
# +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs <>
# http://spatialreference.org/ref/sr-org/6/
MERC_PROJ4 = "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over"
MERC_ELEMENTS = dict([p.split('=') for p in MERC_PROJ4.split() if '=' in p])
mercator = mapnik.Projection(MERC_PROJ4)
CSS_STYLE = "font-family: 'Lucida Grande', Verdana, Helvetica, sans-serif; border-left-width: 0px; border-bottom-width: 2px; border-right-width: 0px; border-top-width: 2px; width: 95%; border-color: #a2d545; border-style: solid; font-size: 14px; margin: 10px; padding: 10px; background: #eeeeee; -moz-border-radius: 2px; -webkit-border-radius: 2px;"
#pattern = r'/(?P<version>\d{1,2}\.\d{1,3})\.\d{1,3})/(?P<layername>[a-z]{1,64})/(?P<z>\d{1,10})/(?P<x>\d{1,10})/(?P<y>\d{1,10})\.(?P<extension>(?:png|jpg|gif))'
#request_re = re.compile(pattern)
def is_merc(srs):
srs = srs.lower()
if 'epsg:900913' in srs:
return True
elif 'epsg:3857' in srs:
return True
elif not 'merc' in srs:
print 'no merc', srs
return False
# strip optional modifiers (those without =)
elements = dict([p.split('=') for p in srs.split() if '=' in p])
for p in elements:
if MERC_ELEMENTS.get(p, None) != elements.get(p, None):
return False
return True
def parse_config(cfg_file):
from ConfigParser import SafeConfigParser
config = SafeConfigParser()
config.read(cfg_file)
params = {}
for section in config.sections():
options = config.items(section)
for param in options:
params[param[0]] = param[1]
return params
def parse_query(qs):
query = dict([i.split('=') for i in urllib.unquote(qs).split('&')])
return query
def is_image_request(path_info):
if path_info.endswith('.png') | path_info.endswith('.jpeg'):
return True
return False
def match(attr,value):
if isinstance(attr,bool) and str(value).lower() in ['on','yes','y','true']:
return True
elif isinstance(attr,bool):
return False
elif isinstance(attr,int):
return int(value)
elif isinstance(attr,str):
return value
else:
return None
class SphericalMercator(object):
"""
Python class defining Spherical Mercator Projection.
Originally from:
http://svn.openstreetmap.org/applications/rendering/mapnik/generate_tiles.py
"""
def __init__(self,levels=18,size=256):
self.Bc = []
self.Cc = []
self.zc = []
self.Ac = []
self.levels = levels
self.DEG_TO_RAD = math.pi/180
self.RAD_TO_DEG = 180/math.pi
self.size = size
for d in range(0,levels):
e = size/2.0;
self.Bc.append(size/360.0)
self.Cc.append(size/(2.0 * math.pi))
self.zc.append((e,e))
self.Ac.append(size)
size *= 2.0
@classmethod
def minmax(a,b,c):
a = max(a,b)
a = min(a,c)
return a
def ll_to_px(self,px,zoom):
d = self.zc[zoom]
e = round(d[0] + px[0] * self.Bc[zoom])
f = self.minmax(math.sin(DEG_TO_RAD * px[1]),-0.9999,0.9999)
g = round(d[1] + 0.5 * math.log((1+f)/(1-f))*-self.Cc[zoom])
return (e,g)
def px_to_ll(self,px,zoom):
""" Convert pixel postion to LatLong (EPSG:4326) """
# TODO - more graceful handling of indexing error
e = self.zc[zoom]
f = (px[0] - e[0])/self.Bc[zoom]
g = (px[1] - e[1])/-self.Cc[zoom]
h = self.RAD_TO_DEG * ( 2 * math.atan(math.exp(g)) - 0.5 * math.pi)
return (f,h)
def xyz_to_envelope(self,x,y,zoom, tms_style=False):
""" Convert XYZ to mapnik.Envelope """
# flip y to match TMS spec
if tms_style:
y = (2**zoom-1) - y
ll = (x * self.size,(y + 1) * self.size)
ur = ((x + 1) * self.size, y * self.size)
minx,miny = self.px_to_ll(ll,zoom)
maxx,maxy = self.px_to_ll(ur,zoom)
lonlat_bbox = mapnik.Envelope(minx,miny,maxx,maxy)
env = mercator.forward(lonlat_bbox)
return env
class Server(object):
def __init__(self, mapfile, config=None):
# private
self._changed = []
self._config = config
self._locked = False
# mutable
self.size = 256
self.buffer_size = 128
self.format = 'png'
self.paletted = False
self.max_zoom = 22
self.debug = True
self.watch_mapfile = False
self.watch_interval = 2
self.max_failures = 6
self.caching = False
self.cache_force = False
self.cache_path = '/tmp' #tempfile.gettempdir()
self._mapnik_map = mapnik.Map(self.size,self.size)
if self._config:
self.absorb_options(parse_config(self._config))
self._mapfile = mapfile
if mapfile.endswith('.xml'):
mapnik.load_map(self._mapnik_map, self._mapfile)
elif mapfile.endswith('.mml'):
import cascadenik
if hasattr(cascadenik,'VERSION'):
major = int(cascadenik.VERSION.split('.')[0])
if major < 1:
from cascadenik import compile as _compile
compiled = '%s_compiled.xml' % os.path.splitext(str(mapfile))[0]
open(compiled, 'w').write(_compile(self._mapfile))
mapnik.load_map(self._mapnik_map, compiled)
elif major == 1:
if str(mapfile).startswith('http'):
output_dir = os.getcwd() #os.path.expanduser('~/.cascadenik')
else:
output_dir = os.path.dirname(str(mapfile))
cascadenik.load_map(self._mapnik_map,mapfile,output_dir,verbose=self.debug)
elif major > 1:
raise NotImplementedError('This TileLite version does not yet support Cascadenik > 1.x, please upgrade to the latest release')
else:
from cascadenik import compile as _compile
compiled = '%s_compiled.xml' % os.path.splitext(str(mapfile))[0]
open(compiled, 'w').write(_compile(self._mapfile))
mapnik.load_map(self._mapnik_map, compiled)
self.post_init_setup()
if self.watch_mapfile:
self.modified = os.path.getmtime(self._mapfile)
import thread
thread.start_new_thread(self.watcher, ())
self._mapnik_map.zoom_all()
self.envelope = self._mapnik_map.envelope()
def post_init_setup(self):
self._merc = SphericalMercator(levels=self.max_zoom+1,size=self.size)
if not is_merc(self._mapnik_map.srs):
self._mapnik_map.srs = MERC_PROJ4
self.msg('Map is not in spherical mercator, so setting that projection....')
def watcher(self):
failed = 0
while 1:
if not self.modified == os.path.getmtime(self._mapfile):
self._locked = True
time.sleep(self.watch_interval/2.0)
self.msg('Mapfile **changed**, reloading... ')
try:
self._mapnik_map = Map(self.size,self.size)
if self._mapfile.endswith('.xml'):
load_map(self._mapnik_map, self._mapfile)
elif self._mapfile.endswith('.mml'):
from cascadenik import load_map as load_mml
load_mml(self._mapnik_map, self._mapfile)
self.msg('Mapfile successfully reloaded from %s' % self._mapfile)
if not is_merc(self._mapnik_map.srs):
self._mapnik_map.srs = MERC_PROJ4
self.msg('Map is not in spherical mercator, so setting that projection....')
failed = 0
except Exception, E:
failed += 1
again = self.watch_interval*2
self.msg('Failed to reload mapfile, will try again in %s seconds:\n%s' % (again,E))
time.sleep(again)
self.modified = os.path.getmtime(self._mapfile)
self._locked = False
else:
time.sleep(self.watch_interval)
if failed > self.max_failures:
self.msg('Giving up on mapfile change watching thread...')
break
return
def msg(self,message):
""" WSGI apps must not print to stdout.
"""
if self.debug:
print >> sys.stderr, '[TileLite Debug] --> %s' % message
def settings(self):
settings = '\n'
for k,v in self.__dict__.items():
if not k.startswith('_'):
if k in self._changed:
v = '%s *changed' % v
settings += '%s = %s\n' % (k,v)
return settings
def settings_dict(self):
settings = {}
for k,v in self.__dict__.items():
if not k.startswith('_'):
settings[k] = v
return settings
def instance_dict(self):
d = {}
m = self._mapnik_map
m.zoom_all()
e = m.envelope()
c = e.center()
e2 = mercator.inverse(e)
c2 = e2.center()
d['extent'] = [e.minx,e.miny,e.maxx,e.maxy]
d['center'] = [c.x,c.y]
d['lonlat_extent'] = [e2.minx,e2.miny,e2.maxx,e2.maxy]
d['lonlat_center'] = [c2.x,c2.y]
d['layers'] = [l.name for l in m.layers]
d['mapfile'] = self._mapfile
return d
def absorb_options(self,opts):
"""
"""
for opt in opts.items():
attr = opt[0]
if hasattr(self,attr) and not attr.startswith('_'):
cur = getattr(self,attr)
new = match(cur,opt[1])
if not new == cur:
setattr(self,attr,new)
self._changed.append(attr)
self.msg(self.settings())
def ready_cache(self,path_to_check):
"""
"""
dirname = os.path.dirname(path_to_check)
if not os.path.exists(dirname):
os.makedirs(dirname)
def hit(self,env):
return self.envelope.intersects(env)
def __call__(self, environ, start_response):
""" WSGI request handler """
response_status = "200 OK"
mime_type = 'text/html'
if not self._locked:
path_info = environ['PATH_INFO']
qs = environ['QUERY_STRING']
zoom,x,y = None,None,None
if qs:
query = parse_query(qs)
x = query.get('x')
y = query.get('y')
zoom = query.get('z')
if x and y and zoom:
x = int(x)
y = int(y)
zoom = int(zoom)
self.format = query.get('format','png')
elif is_image_request(path_info):
uri, self.format = path_info.split('.')
zoom,x,y = map(int,uri.split('/')[-3:])
if (x is not None) and (y is not None) and (zoom is not None):
im = mapnik.Image(self.size,self.size)
if self.caching:
tile_dir = os.path.join(self.cache_path,str(zoom),str(x),'%s.%s' % (str(y),self.format) )
if self.cache_force or not os.path.exists(tile_dir):
# TODO - throw an error if zoom > self._merc.levels
envelope = self._merc.xyz_to_envelope(x,y,zoom)
if self.hit(envelope): # skip rendering and ds query if tile will be blank
self._mapnik_map.zoom_to_box(envelope)
self._mapnik_map.buffer_size = self.buffer_size
mapnik.render(self._mapnik_map,im)
else:
# respect map background for blank tiles
if self._mapnik_map.background:
im.background = self._mapnik_map.background
self.ready_cache(tile_dir)
if self.paletted:
im.save(tile_dir,'png256')
else:
im.save(tile_dir)
self.msg('saving...%s' % tile_dir)
elif self.caching:
# todo: benchmark opening without using mapnik...
im = im.open(tile_dir)
self.msg('cache hit!')
else:
envelope = self._merc.xyz_to_envelope(x,y,zoom)
if self.hit(envelope): # skip rendering and ds query if tile will be blank
self._mapnik_map.zoom_to_box(envelope)
self._mapnik_map.buffer_size = self.buffer_size
mapnik.render(self._mapnik_map,im)
else:
# respect map background for blank tiles
if self._mapnik_map.background:
im.background = self._mapnik_map.background
if self.paletted:
response = im.tostring('png256')
else:
response = im.tostring(self.format)
mime_type = 'image/%s' % self.format
self.msg('Zoom,X,Y: %s,%s,%s' % (zoom,x,y,))
self.msg('scale_denom: %s' % (self._mapnik_map.scale_denominator()))
elif path_info.endswith('settings/'):
response = '<h2>TileLite Settings</h2>'
response += '<pre style="%s">%s</pre>' % (CSS_STYLE,self.settings())
if self._config:
response += '<h4>From: %s</h4>' % self._config
else:
response += '<h4>*default settings*</h4>'
elif path_info.endswith('settings.json'):
response = str(self.settings_dict())
mime_type = 'text/plain'
elif path_info.endswith('instance.json'):
if 'jsoncallback' in query:
response = ('%s(%s);' % (query['jsoncallback'], self.instance_dict()))
mime_type = 'application/json'
else:
response = str(self.instance_dict())
mime_type = 'text/plain'
elif not path_info.strip('/'):
root = '%s%s' % (environ['SCRIPT_NAME'], path_info.strip('/'))
response = '''<h2>TileLite</h2>
<div style="%(style)s"><p>Welcome, ready to accept a tile request in the format of:</p>
<p>%(root)s/zoom/x/y.png</p>
<p>or</p>
<p>%(root)s/?x=0&y=0&z=0&format=png</p>
<p>Example url: <a href="%(root)s/1/0/0.png">%(root)s/1/0/0.png</a></p>
<p>js: var tiles = new OpenLayers.Layer.OSM("Mapnik", "http://%(http_host)s/${z}/${x}/${y}.png");</p>
<p>See TileLite settings: <a href="%(root)s/settings/">%(root)s/settings/</a>
| <a href="%(root)s/settings.json">%(root)s/settings.json</a></p>
<p> More info: <a href="http://bitbucket.org/springmeyer/tilelite/">
bitbucket.org/springmeyer/tilelite/</a></p></div>
''' % {'root': root,'style':CSS_STYLE,'http_host':environ['HTTP_HOST']}
else:
response = '<h1> Page Not found </h1>'
response_status = "404 Not Found"
else:
mime_type = 'image/%s' % self.format
im = mapnik.Image(self.size,self.size)
im.background = mapnik.Color('pink')
response = im.tostring(self.format)
#self.msg('Multithreaded: %s | Multiprocess: %s' % (environ['wsgi.multithread'],environ['wsgi.multiprocess']))
start_response(response_status,[('Content-Type', mime_type)])
yield response
if __name__ == '__main__':
import doctest
doctest.testmod()
|