You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
4.1 KiB
Python
103 lines
4.1 KiB
Python
import tornado.ioloop
|
|
import tornado.web
|
|
import io
|
|
import os
|
|
|
|
from sqlalchemy import Column, ForeignKey, Integer, String
|
|
from sqlalchemy.ext.declarative import declarative_base
|
|
from sqlalchemy.orm import relationship
|
|
from sqlalchemy import create_engine
|
|
from sqlalchemy import inspect
|
|
from sqlalchemy import text
|
|
from sqlalchemy.orm import sessionmaker
|
|
|
|
import mercantile
|
|
import pyproj
|
|
import yaml
|
|
import sys
|
|
import itertools
|
|
|
|
def GetTM2Source(file):
|
|
with open(file,'r') as stream:
|
|
tm2source = yaml.load(stream)
|
|
return tm2source
|
|
|
|
def GenerateBaseQuery(layers):
|
|
queries = []
|
|
query = ""
|
|
for layer in layers['Layer']:
|
|
buffer_size = str(layer['properties']['buffer-size'])
|
|
layer_query = layer['Datasource']['table'].lstrip().rstrip() # Remove lead and trailing whitespace
|
|
layer_query = layer_query[1:len(layer_query)-6] # Remove enough characters to remove first and last () and "AS t"
|
|
layer_query = layer_query.replace("geometry", f"ST_AsMVTGeom(geometry,!bbox!,4096,{buffer_size},true) AS mvtgeometry")
|
|
base_query = f"SELECT ST_ASMVT(tile, '{layer['id']}', 4096, 'mvtgeometry') FROM ({layer_query} WHERE ST_AsMVTGeom(geometry, !bbox!,4096,{buffer_size},true) IS NOT NULL) AS tile"
|
|
queries.append(base_query)
|
|
query = query + " UNION ALL ".join(queries) + ";"
|
|
print(query)
|
|
return(query)
|
|
|
|
layers = GetTM2Source("/mapping/data.yml")
|
|
base_query = GenerateBaseQuery(layers)
|
|
engine = create_engine('postgresql://'+os.getenv('POSTGRES_USER','openmaptiles')+':'+os.getenv('POSTGRES_PASSWORD','openmaptiles')+'@'+os.getenv('POSTGRES_HOST','postgres')+':'+os.getenv('POSTGRES_PORT','5432')+'/'+os.getenv('POSTGRES_DB','openmaptiles'))
|
|
inspector = inspect(engine)
|
|
DBSession = sessionmaker(bind=engine)
|
|
session = DBSession()
|
|
#session.execute(prepared)
|
|
|
|
def bounds(zoom,x,y):
|
|
inProj = pyproj.Proj(init='epsg:4326')
|
|
outProj = pyproj.Proj(init='epsg:3857')
|
|
lnglatbbox = mercantile.bounds(x,y,zoom)
|
|
ws = (pyproj.transform(inProj,outProj,lnglatbbox[0],lnglatbbox[1]))
|
|
en = (pyproj.transform(inProj,outProj,lnglatbbox[2],lnglatbbox[3]))
|
|
return {'w':ws[0],'s':ws[1],'e':en[0],'n':en[1]}
|
|
|
|
def zoom_to_scale_denom(zoom): # For !scale_denominator!
|
|
# From https://github.com/openstreetmap/mapnik-stylesheets/blob/master/zoom-to-scale.txt
|
|
map_width_in_metres = 40075016.68557849
|
|
tile_width_in_pixels = 256.0
|
|
standardized_pixel_size = 0.00028
|
|
map_width_in_pixels = tile_width_in_pixels*(2.0**zoom)
|
|
return str(map_width_in_metres/(map_width_in_pixels * standardized_pixel_size))
|
|
|
|
def replace_tokens(query,s,w,n,e,scale_denom):
|
|
return query.replace("!bbox!","ST_MakeBox2D(ST_Point("+w+", "+s+"), ST_Point("+e+", "+n+"))").replace("!scale_denominator!",scale_denom).replace("!pixel_width!","256").replace("!pixel_height!","256")
|
|
|
|
def get_mvt(zoom,x,y):
|
|
try: # Sanitize the inputs
|
|
sani_zoom,sani_x,sani_y = float(zoom),float(x),float(y)
|
|
del zoom,x,y
|
|
except:
|
|
print('suspicious')
|
|
return 1
|
|
|
|
scale_denom = zoom_to_scale_denom(sani_zoom)
|
|
tilebounds = bounds(sani_zoom,sani_x,sani_y)
|
|
s,w,n,e = str(tilebounds['s']),str(tilebounds['w']),str(tilebounds['n']),str(tilebounds['e'])
|
|
sent_query = replace_tokens(base_query,s,w,n,e,scale_denom)
|
|
print(sent_query)
|
|
response = list(session.execute(sent_query))
|
|
layers = filter(None,list(itertools.chain.from_iterable(response)))
|
|
final_tile = b''
|
|
for layer in layers:
|
|
final_tile = final_tile + io.BytesIO(layer).getvalue()
|
|
return final_tile
|
|
|
|
class GetTile(tornado.web.RequestHandler):
|
|
def get(self, zoom,x,y):
|
|
self.set_header("Content-Type", "application/x-protobuf")
|
|
self.set_header("Content-Disposition", "attachment")
|
|
self.set_header("Access-Control-Allow-Origin", "*")
|
|
response = get_mvt(zoom,x,y)
|
|
self.write(response)
|
|
|
|
def m():
|
|
if __name__ == "__main__":
|
|
# Make this prepared statement from the tm2source
|
|
application = tornado.web.Application([(r"/tiles/([0-9]+)/([0-9]+)/([0-9]+).pbf", GetTile)])
|
|
print("Postserve started..")
|
|
application.listen(8080)
|
|
tornado.ioloop.IOLoop.instance().start()
|
|
|
|
m()
|