add dynamic tile arguments

api/obs/api/routes/tiles.py

@@ -1,5 +1,6 @@
 from gzip import decompress
 from sqlite3 import connect
+from sanic.exceptions import Forbidden
 from sanic.response import raw
 
 from sqlalchemy import select, text
@@ -23,7 +24,7 @@ def get_tile(filename, zoom, x, y):
 
     content = db.execute(
         "SELECT tile_data FROM tiles WHERE zoom_level=? AND tile_column=? AND tile_row=?",
-        (zoom, x, (2 ** zoom - 1) - y),
+        (zoom, x, (2**zoom - 1) - y),
     ).fetchone()
     return content and content[0] or None
 
@@ -38,11 +39,21 @@ async def tiles(req, zoom: int, x: int, y: str):
         tile = get_tile(req.app.config.TILES_FILE, int(zoom), int(x), int(y))
 
     else:
+        user_id = req.ctx.get_single_arg("user_id", convert=int, default=None)
+        if user_id is not None:
+            if req.ctx.user is None or req.ctx.user.id != user_id:
+                raise Forbidden()
+
         tile = await req.ctx.db.scalar(
-            text(f"select data from getmvt(:zoom, :x, :y) as b(data, key);").bindparams(
+            text(
+                f"select data from getmvt(:zoom, :x, :y, :user_id, :min_time, :max_time) as b(data, key);"
+            ).bindparams(
                 zoom=int(zoom),
                 x=int(x),
                 y=int(y),
+                user_id=user_id,
+                min_time=None,
+                max_time=None,
             )
         )
 
@@ -66,4 +77,3 @@ async def tiles(req, zoom: int, x: int, y: str):
         tile = decompress(tile)
 
     return raw(tile, content_type="application/x-protobuf", headers=headers)
-

api/tools/prepare_sql_tiles.py

@@ -6,9 +6,12 @@ import re
 import os
 import glob
 from os.path import normpath, abspath, join
+from typing import List, Tuple
+
 
 from sqlalchemy import text
 import sqlparse
+from openmaptiles.sqltomvt import MvtGenerator
 
 from obs.api.app import app
 from obs.api.db import connect_db, make_session
@@ -21,6 +24,32 @@ TILE_GENERATOR = normpath(
 )
 TILESET_FILE = join(TILE_GENERATOR, "openbikesensor.yaml")
 
+EXTRA_ARGS = [
+    # name, type, default
+    ("user_id", "integer", "NULL"),
+    ("min_time", "timestamp", "NULL"),
+    ("max_time", "timestamp", "NULL"),
+]
+
+
+class CustomMvtGenerator(MvtGenerator):
+    def generate_sqltomvt_func(self, fname, extra_args: List[Tuple[str, str]]) -> str:
+        """
+        Creates a SQL function that returns a single bytea value or null. This
+        method is overridden to allow for custom arguments in the created function
+        """
+        extra_args_types = "".join([f", {a[1]}" for a in extra_args])
+        extra_args_definitions = "".join(
+            [f", {a[0]} {a[1]} DEFAULT {a[2]}" for a in extra_args]
+        )
+
+        return f"""\
+DROP FUNCTION IF EXISTS {fname}(integer, integer, integer{extra_args_types});
+CREATE FUNCTION {fname}(zoom integer, x integer, y integer{extra_args_definitions})
+RETURNS {'TABLE(mvt bytea, key text)' if self.key_column else 'bytea'} AS $$
+{self.generate_sql()};
+$$ LANGUAGE SQL STABLE RETURNS NULL ON NULL INPUT;"""
+
 
 def parse_pg_url(url=app.config.POSTGRES_URL):
     m = re.match(
@@ -114,9 +143,21 @@ async def generate_sql(build_dir):
         with open(filename, "rt") as f:
             sql_snippets.append(f.read())
 
-    getmvt_sql = await _run(
+    mvt = CustomMvtGenerator(
-        f"python $(which generate-sqltomvt) {TILESET_FILE!r} --key --gzip --postgis-ver 3.0.1 --function --fname=getmvt"
+        tileset=TILESET_FILE,
+        postgis_ver="3.0.1",
+        zoom="zoom",
+        x="x",
+        y="y",
+        gzip=True,
+        test_geometry=False,  # ?
+        key_column=True,
     )
+    getmvt_sql = mvt.generate_sqltomvt_func("getmvt", EXTRA_ARGS)
+    print(getmvt_sql)
+
+    # drop old versions of the function
+    sql_snippets.append("DROP FUNCTION IF EXISTS getmvt(integer, integer, integer);")
     sql_snippets.append(getmvt_sql)
 
     return sql_snippets

tile-generator/layers/obs_events/layer.sql

@@ -1,8 +1,8 @@
-CREATE OR REPLACE FUNCTION layer_obs_events(bbox geometry, zoom_level int)
+CREATE OR REPLACE FUNCTION layer_obs_events(bbox geometry, zoom_level int, user_id integer, min_time timestamp, max_time timestamp)
 RETURNS TABLE(event_id bigint, geometry geometry, distance_overtaker float, distance_stationary float, direction int, course float, speed float, zone zone_type, way_id bigint) AS $$
 
     SELECT
-      id::bigint as event_id,
+      overtaking_event.id::bigint as event_id,
       ST_Transform(overtaking_event.geometry, 3857) as geometry,
       distance_overtaker,
       distance_stationary,
@@ -12,7 +12,10 @@ RETURNS TABLE(event_id bigint, geometry geometry, distance_overtaker float, dist
       CASE WHEN road.zone IS NULL THEN 'urban' else road.zone END as zone,
       overtaking_event.way_id::bigint as way_id
     FROM overtaking_event
-    FULL OUTER JOIN road ON (road.way_id = overtaking_event.way_id)
+    FULL OUTER JOIN road ON road.way_id = overtaking_event.way_id
-    WHERE ST_Transform(overtaking_event.geometry, 3857) && bbox;
+    JOIN track on track.id = overtaking_event.track_id
+    WHERE ST_Transform(overtaking_event.geometry, 3857) && bbox
+      AND (user_id is NULL OR user_id = track.author_id)
+      AND time BETWEEN COALESCE(min_time, '1900-01-01'::timestamp) AND COALESCE(max_time, '2100-01-01'::timestamp);
 
 $$ LANGUAGE SQL IMMUTABLE;

tile-generator/layers/obs_events/obs_events.yaml

@@ -25,7 +25,13 @@ layer:
     geometry_field: geometry
     key_field: event_id
     key_field_as_attribute: no
-    query: (SELECT event_id, geometry, distance_overtaker, distance_stationary, direction, course, speed, zone, way_id FROM layer_obs_events(!bbox!, z(!scale_denominator!))) AS t
+    query: >
+      (
+        SELECT
+          event_id, geometry, distance_overtaker, distance_stationary, direction, course, speed, zone, way_id
+        FROM
+          layer_obs_events(!bbox!, z(!scale_denominator!), user_id, min_time, max_time)
+      ) AS t
 
 schema:
   - ./layer.sql