added sanic app

mapshader/sanic_app.py

@@ -0,0 +1,95 @@
+from functools import partial
+
+try:
+    from sanic import Sanic
+    from sanic import response
+except ImportError:
+    raise ImportError('You must install sanic `pip install sanic` to use this module')
+
+from mapshader.core import render_map
+from mapshader.core import render_geojson
+from mapshader.sources import get_all_sources
+
+
+def get_tile_func(source):
+    async def to_tile(request, z=0, x=0, y=0):
+        img = render_map(source, x=int(x), y=int(y), z=int(z))
+        bites = img.to_bytesio()
+        return response.raw(bites.getvalue(), content_type='image/png')
+    return to_tile
+
+
+def get_image_func(source):
+    async def to_image(request,
+                       xmin=-20e6, ymin=-20e6,
+                       xmax=20e6, ymax=20e6,
+                       height=500, width=500):
+
+        img = render_map(source, xmin=float(xmin), ymin=float(ymin),
+                         xmax=float(xmax), ymax=float(ymax),
+                         height=int(height), width=int(width))
+        bites = img.to_bytesio()
+        return response.raw(bites.getvalue(), content_type='image/png')
+    return to_image
+
+
+def get_wms_func(source):
+    async def to_wms(request):
+        height = request.args.get('height')
+        width = request.args.get('width')
+        bbox = request.args.get('bbox')
+        xmin, ymin, xmax, ymax = bbox.split(',')
+        img = render_map(source, xmin=float(xmin), ymin=float(ymin),
+                         xmax=float(xmax), ymax=float(ymax),
+                         height=int(height), width=int(width))
+        bites = img.to_bytesio()
+        return response.raw(bites.getvalue(), content_type='image/png')
+    return to_wms
+
+
+def get_geojson_func(source):
+    async def to_geojson(request):
+        resp = render_geojson(source)
+        return response.text(resp, content_type='application/json')
+    return to_geojson
+
+
+def configure_app(app, user_source_filepath=None):
+
+    sources = get_all_sources(user_source_filepath)
+
+    for source in sources.values():
+
+        app.add_route(get_tile_func(source),
+                      source.tile_url)
+
+        app.add_route(get_image_func(source),
+                      source.image_url)
+
+        app.add_route(get_wms_func(source),
+                      source.wms_url)
+
+        app.add_route(get_geojson_func(source),
+                      source.geojson_url)
+
+    return app
+
+
+def create_app(user_source_filepath=None):
+    app = Sanic(__name__)
+    return configure_app(app, user_source_filepath)
+
+
+if __name__ == '__main__':
+    from argparse import ArgumentParser
+    from os import path
+
+    parser = ArgumentParser()
+    parser.add_argument('-f')
+    user_file = parser.parse_args().f
+    if user_file:
+        user_file_path = path.abspath(path.expanduser(user_file))
+    else:
+        user_file_path = None
+    app = create_app(user_file).run(host='0.0.0.0', port=5000, workers=4, debug=True)
+    app.run()