#!/usr/bin/python3 """Views for the web app.""" import inspect import json import re import sys import traceback import typing from time import sleep, time import flask import flask_login # type: ignore import GeoIP # type: ignore import lxml import maxminddb import requests import sqlalchemy import werkzeug from requests_oauthlib import OAuth1Session from sqlalchemy import func from sqlalchemy.sql.expression import update from matcher import ( api, commons, database, edit, error_mail, mail, model, nominatim, osm_oauth, wikidata, wikidata_api, ) from matcher.data import property_map StrDict = dict[str, typing.Any] srid = 4326 re_point = re.compile(r"^POINT\((.+) (.+)\)$") app = flask.Flask(__name__) app.debug = True app.config.from_object("config.default") error_mail.setup_error_mail(app) login_manager = flask_login.LoginManager(app) login_manager.login_view = "login_route" osm_api_base = "https://api.openstreetmap.org/api/0.6" maxminddb_reader = maxminddb.open_database(app.config["GEOLITE2"]) DB_URL = "postgresql:///matcher" database.init_db(DB_URL) entity_keys = {"labels", "sitelinks", "aliases", "claims", "descriptions", "lastrevid"} re_qid = re.compile(r"^Q\d+$") @app.teardown_appcontext def shutdown_session(exception=None) -> None: """Shutdown session.""" database.session.remove() @app.before_request def global_user() -> None: """Make user object available globally.""" flask.g.user = flask_login.current_user._get_current_object() def dict_repr_values(d): return {key: repr(value) for key, value in d.items()} @app.errorhandler(werkzeug.exceptions.InternalServerError) def exception_handler( e: werkzeug.exceptions.InternalServerError, ) -> tuple[str | werkzeug.wrappers.Response, int]: """Handle exception.""" exec_type, exc_value, current_traceback = sys.exc_info() assert exc_value tb = werkzeug.debug.tbtools.DebugTraceback(exc_value) # summary = tb.render_traceback_html(include_title=False) last_frame = list(traceback.walk_tb(current_traceback))[-1][0] last_frame_args = inspect.getargs(last_frame.f_code) if flask.request.path.startswith("/api/"): return ( cors_jsonify( { "success": False, "error": tb._te.exc_type.__name__, "traceback": tb.render_traceback_text(), "locals": dict_repr_values(last_frame.f_locals), "last_function": { "name": last_frame.f_code.co_name, "args": repr(last_frame_args), }, } ), 500, ) return ( flask.render_template( "show_error.html", tb=tb, last_frame=last_frame, last_frame_args=last_frame_args, ), 500, ) def cors_jsonify(*args, **kwargs) -> flask.Response: """Add CORS header to JSON.""" response = flask.jsonify(*args, **kwargs) response.headers["Access-Control-Allow-Origin"] = "*" return response def check_for_tagged_qids(qids: list[str]) -> set[str]: """Check OSM for existing wikidata tags for given QIDs.""" tagged = set() for qid in qids: for cls in model.Point, model.Polygon, model.Line: q = cls.query.filter(cls.tags["wikidata"] == qid) if q.count(): tagged.add(qid) break return tagged def check_for_tagged_qid(qid): return any( database.session.query( cls.query.filter( cls.tags.has_key("wikidata"), cls.tags["wikidata"] == qid ).exists() ).scalar() for cls in (model.Point, model.Polygon, model.Line) ) def geoip_user_record(): gi = GeoIP.open(app.config["GEOIP_DATA"], GeoIP.GEOIP_STANDARD) remote_ip = flask.request.args.get("ip", flask.request.remote_addr) return gi.record_by_addr(remote_ip) def get_user_location() -> StrDict | None: """Get user location.""" remote_ip = flask.request.args.get("ip", flask.request.remote_addr) assert remote_ip maxmind = maxminddb_reader.get(remote_ip) return typing.cast(StrDict, maxmind.get("location")) if maxmind else None @app.route("/") def redirect_from_root() -> werkzeug.wrappers.Response: """Redirect from root to map start page.""" return flask.redirect(flask.url_for("map_start_page")) @app.route("/index") def index_page() -> str: """Index page.""" return flask.render_template("index.html") def get_username() -> str | None: """Username for current user.""" user = flask_login.current_user return user.username if user.is_authenticated else None @app.route("/isa/Q", methods=["GET", "POST"]) def isa_page(item_id: int) -> werkzeug.wrappers.Response | str: """Return IsA page.""" item = api.get_item(item_id) if flask.request.method == "POST": tag_or_key = flask.request.form["tag_or_key"] extra = model.ItemExtraKeys(item=item, tag_or_key=tag_or_key) database.session.add(extra) database.session.commit() flask.flash("extra OSM tag/key added") endpoint = flask.request.endpoint assert endpoint return flask.redirect(flask.url_for(endpoint, item_id=item_id)) q = model.ItemExtraKeys.query.filter_by(item=item) extra = [e.tag_or_key for e in q] subclass_property = "P279" subclass_list = [] assert item for s in item.get_claim(subclass_property): assert isinstance(s, dict) subclass_item_id = s["numeric-id"] assert subclass_item_id and isinstance(subclass_item_id, int) subclass = api.get_item(subclass_item_id) assert subclass subclass_list.append( { "qid": s["id"], "item_id": subclass_item_id, "label": subclass.label(), "description": subclass.description(), "isa_page_url": flask.url_for("isa_page", item_id=s["numeric-id"]), } ) tags = api.get_tags_for_isa_item(item) return flask.render_template( "isa.html", item=item, extra=extra, subclass_list=subclass_list, username=get_username(), tags=tags, ) @app.route("/admin/skip_isa") def admin_skip_isa_list(): q = model.Item.query.join(model.SkipIsA).order_by(model.Item.item_id) return flask.render_template("admin/skip_isa.html", q=q) @app.route("/identifier") def identifier_index(): return flask.render_template("identifier_index.html", property_map=property_map) @app.route("/commons/") def get_commons_image(filename): detail = commons.image_detail([filename], thumbheight=1200, thumbwidth=1200) image = detail[filename] return flask.redirect(image["thumburl"]) @app.route("/identifier/") def identifier_page(pid): per_page = 10 page = int(flask.request.args.get("page", 1)) property_dict = {pid: (osm_keys, label) for pid, osm_keys, label in property_map} osm_keys, label = property_dict[pid] wd = model.Item.query.filter(model.Item.claims.has_key(pid)) total = wd.count() start = per_page * (page - 1) items = wd.all()[start : per_page * page] qids = [item.qid for item in items] print(qids) # pred = None # values = set() # for item in items: # values |= set(item.get_claim(pid)) # # for key in osm_keys: # if key == 'ref': # continue # if pred is None: # pred = model.Point.tags[key].in_(values) # else: # pred |= model.Point.tags[key].in_(values) # osm_points = {} for qid in qids: osm_points[qid] = model.Point.query.filter( model.Point.tags["wikidata"] == qid ).all() osm_total = len(osm_points) return flask.render_template( "identifier_page.html", pid=pid, osm_keys=osm_keys, label=label, items=items, total=total, osm_total=osm_total, osm_points=osm_points, ) @app.route("/map") def map_start_page() -> werkzeug.wrappers.Response: """Map start page.""" loc = get_user_location() if loc: lat, lon = loc["latitude"], loc["longitude"] radius = loc["accuracy_radius"] else: lat, lon = 42.2917, -85.5872 radius = 5 return flask.redirect( flask.url_for( "map_location", lat=f"{lat:.5f}", lon=f"{lon:.5f}", zoom=16, radius=radius, ip=flask.request.args.get("ip"), ) ) @app.route("/documentation") def documentation_page() -> str: """Documentation.""" user = flask_login.current_user username = user.username if user.is_authenticated else None return flask.render_template( "documentation.html", active_tab="documentation", username=username ) @app.route("/search") def search_page() -> str: """Search.""" loc = get_user_location() assert loc q = flask.request.args.get("q") user = flask_login.current_user username = user.username if user.is_authenticated else None return flask.render_template( "map.html", active_tab="map", lat=f'{loc["latitude"]:.5f}', lon=f'{loc["longitude"]:.5f}', zoom=16, radius=loc["accuracy_radius"], username=username, mode="search", q=q, ) @app.route("/map///") def map_location(zoom: int, lat: float, lon: float) -> str: """Map location.""" qid = flask.request.args.get("item") isa_param = flask.request.args.get("isa") if qid: api.get_item(int(qid[1:])) isa_list = [] if isa_param: for isa_qid in isa_param.split(";"): isa = api.get_item(int(isa_qid[1:])) if not isa: continue cur = { "qid": isa.qid, "label": isa.label(), } isa_list.append(cur) return flask.render_template( "map.html", active_tab="map", zoom=zoom, lat=lat, lon=lon, radius=flask.request.args.get("radius"), username=get_username(), mode="map", q=None, item_type_filter=isa_list, ) @app.route("/item/Q") def lookup_item(item_id: int): """Lookup item.""" item = api.get_item(item_id) if not item: # TODO: show nicer page for Wikidata item not found return flask.abort(404) try: lat, lon = item.locations[0].get_lat_lon() except IndexError: # TODO: show nicer page for Wikidata item without coordinates return flask.abort(404) return flask.render_template( "map.html", active_tab="map", zoom=16, lat=lat, lon=lon, username=get_username(), mode="map", q=None, qid=item.qid, item_type_filter=[], ) url = flask.url_for("map_location", zoom=16, lat=lat, lon=lon, item=item.qid) return flask.redirect(url) @app.route("/search/map") def search_map_page() -> str: """Search map page.""" user_lat, user_lon = get_user_location() or (None, None) q = flask.request.args.get("q") if not q: return flask.render_template("map.html", user_lat=user_lat, user_lon=user_lon) hits = nominatim.lookup(q) for hit in hits: if "geotext" in hit: del hit["geotext"] bbox = [hit["boundingbox"] for hit in hits] return flask.render_template( "search_map.html", hits=hits, bbox_list=bbox, user_lat=user_lat, user_lon=user_lon, ) def read_bounds_param() -> list[float]: """Read bounds parameter.""" return [float(i) for i in flask.request.args["bounds"].split(",")] def read_isa_filter_param(): isa_param = flask.request.args.get("isa") if isa_param: return set(qid.strip() for qid in isa_param.upper().split(",")) @app.route("/api/1/location") def show_user_location() -> werkzeug.wrappers.Response: """User location.""" return cors_jsonify(get_user_location()) @app.route("/api/1/count") def api_wikidata_items_count() -> werkzeug.wrappers.Response: t0 = time() isa_filter = read_isa_filter_param() count = api.wikidata_items_count(read_bounds_param(), isa_filter=isa_filter) t1 = time() - t0 return cors_jsonify(success=True, count=count, duration=t1) @app.route("/api/1/isa_search") def api_isa_search(): t0 = time() search_terms = flask.request.args.get("q") items = api.isa_incremental_search(search_terms) t1 = time() - t0 return cors_jsonify(success=True, items=items, duration=t1) @app.route("/api/1/isa") def api_wikidata_isa_counts(): t0 = time() bounds = read_bounds_param() isa_filter = read_isa_filter_param() isa_count = api.wikidata_isa_counts(bounds, isa_filter=isa_filter) t1 = time() - t0 return cors_jsonify(success=True, isa_count=isa_count, bounds=bounds, duration=t1) @app.route("/api/1/items") def api_wikidata_items(): t0 = time() bounds = read_bounds_param() isa_filter = read_isa_filter_param() ret = api.wikidata_items(bounds, isa_filter=isa_filter) t1 = time() - t0 return cors_jsonify(success=True, duration=t1, **ret) @app.route("/api/1/place//") def api_place_items(osm_type, osm_id): t0 = time() ret = api.get_place_items(osm_type, osm_id) t1 = time() - t0 return cors_jsonify(success=True, duration=t1, **ret) @app.route("/api/1/osm") def api_osm_objects(): t0 = time() isa_filter = read_isa_filter_param() objects = api.get_osm_with_wikidata_tag(read_bounds_param(), isa_filter=isa_filter) t1 = time() - t0 return cors_jsonify(success=True, objects=objects, duration=t1) @app.route("/api/1/item/Q") def api_get_item(item_id): t0 = time() item = model.Item.query.get(item_id) detail = api.item_detail(item) t1 = time() - t0 return cors_jsonify(success=True, duration=t1, **detail) @app.route("/api/1/item/Q/tags") def api_get_item_tags(item_id): t0 = time() item = model.Item.query.get(item_id) tags = api.get_item_tags(item) osm_list = sorted(tags.keys()) t1 = time() - t0 return cors_jsonify( success=True, qid=item.qid, tag_or_key_list=osm_list, tag_src=tags, duration=t1 ) def expand_street_name(from_names): ret = set(from_names) for name in from_names: if any(name.startswith(st) for st in ("St ", "St. ")): first_space = name.find(" ") ret.add("Saint" + name[first_space:]) if ", " in name: for n in set(ret): comma = n.find(", ") ret.add(name[:comma]) elif "/" in name: for n in set(ret): ret.extend(part.strip() for part in n.split("/")) ret.update({"The " + name for name in ret if not name.startswith("The ")}) return ret @app.route("/api/1/item/Q/candidates") def api_find_osm_candidates(item_id): t0 = time() item = model.Item.query.get(item_id) if not item: return cors_jsonify(success=True, qid=f"Q{item_id}", error="item doesn't exist") if not item.locations: return cors_jsonify( success=True, qid=f"Q{item_id}", error="item has no coordinates" ) label = item.label() item_is_street = item.is_street() item_is_watercourse = item.is_watercourse() if item_is_street: max_distance = 5_000 limit = None names = expand_street_name([label] + item.get_aliases()) elif item_is_watercourse: max_distance = 20_000 limit = None names = {label} else: max_distance = 1_000 limit = 40 names = None nearby = api.find_osm_candidates( item, limit=limit, max_distance=max_distance, names=names ) if (item_is_street or item_is_watercourse) and not nearby: # nearby = [osm for osm in nearby if street_name_match(label, osm)] # try again without name filter nearby = api.find_osm_candidates(item, limit=100, max_distance=1_000) t1 = time() - t0 return cors_jsonify( success=True, qid=item.qid, nearby=nearby, duration=t1, max_distance=max_distance, ) @app.route("/api/1/missing") def api_missing_wikidata_items(): t0 = time() qids_arg = flask.request.args.get("qids") if not qids_arg: return cors_jsonify( success=False, error="required parameter 'qids' is missing", items=[], isa_count=[], ) qids = [] for qid in qids_arg.upper().split(","): qid = qid.strip() m = re_qid.match(qid) if not m: continue qids.append(qid) if not qids: return flask.jsonify(success=True, items=[], isa_count=[]) lat, lon = flask.request.args.get("lat"), flask.request.args.get("lon") ret = api.missing_wikidata_items(qids, lat, lon) t1 = time() - t0 return cors_jsonify(success=True, duration=t1, **ret) @app.route("/api/1/search") def api_search(): q = flask.request.args["q"] hits = nominatim.lookup(q) for hit in hits: hit["name"] = nominatim.get_hit_name(hit) hit["label"] = nominatim.get_hit_label(hit) hit["address"] = list(hit["address"].items()) if "osm_type" in hit and "osm_id" in hit: hit["identifier"] = f"{hit['osm_type']}/{hit['osm_id']}" else: print(hit) print(q) return cors_jsonify(success=True, hits=hits) @app.route("/api/1/polygon//") def api_polygon(osm_type, osm_id): obj = model.Polygon.get_osm(osm_type, osm_id) return cors_jsonify( successful=True, osm_type=osm_type, osm_id=osm_id, geojson=obj.geojson() ) @app.route("/refresh/Q") def refresh_item(item_id: int) -> str: """Refresh the local mirror of a Wikidata item.""" item = model.Item.query.get(item_id) qid = f"Q{item_id}" entity = wikidata_api.get_entity(qid) entity_qid = entity.pop("id") assert qid == entity_qid coords = wikidata.get_entity_coords(entity["claims"]) obj = {k: v for k, v in entity.items() if k in entity_keys} if item: for k, v in obj.items(): setattr(item, k, v) else: item = model.Item(item_id=item_id, **obj) database.session.add(item) if coords: item.locations = model.location_objects(coords) database.session.commit() return "done" @app.route("/login") def login_openstreetmap() -> flask.Response: """Redirect to login.""" return flask.redirect( flask.url_for("start_oauth", next=flask.request.args.get("next")) ) @app.route("/logout") def logout() -> flask.Response: """Logout.""" next_url = flask.request.args.get("next") or flask.url_for("map_start_page") flask_login.logout_user() flask.flash("you are logged out") return flask.redirect(next_url) @app.route("/done/") def done(): flask.flash("login successful") return flask.redirect(flask.url_for("map_start_page")) @app.route("/oauth/start") def start_oauth(): """Start OAuth.""" next_page = flask.request.args.get("next") if next_page: flask.session["next"] = next_page client_key = app.config["CLIENT_KEY"] client_secret = app.config["CLIENT_SECRET"] request_token_url = "https://www.openstreetmap.org/oauth/request_token" callback = flask.url_for("oauth_callback", _external=True) oauth = OAuth1Session( client_key, client_secret=client_secret, callback_uri=callback ) fetch_response = oauth.fetch_request_token(request_token_url) flask.session["owner_key"] = fetch_response.get("oauth_token") flask.session["owner_secret"] = fetch_response.get("oauth_token_secret") base_authorization_url = "https://www.openstreetmap.org/oauth/authorize" authorization_url = oauth.authorization_url( base_authorization_url, oauth_consumer_key=client_key ) return flask.redirect(authorization_url) @login_manager.user_loader def load_user(user_id) -> model.User: """User with the given user_id.""" return model.User.query.get(user_id) @app.route("/oauth/callback", methods=["GET"]) def oauth_callback(): client_key = app.config["CLIENT_KEY"] client_secret = app.config["CLIENT_SECRET"] oauth = OAuth1Session( client_key, client_secret=client_secret, resource_owner_key=flask.session["owner_key"], resource_owner_secret=flask.session["owner_secret"], ) oauth_response = oauth.parse_authorization_response(flask.request.url) verifier = oauth_response.get("oauth_verifier") access_token_url = "https://www.openstreetmap.org/oauth/access_token" oauth = OAuth1Session( client_key, client_secret=client_secret, resource_owner_key=flask.session["owner_key"], resource_owner_secret=flask.session["owner_secret"], verifier=verifier, ) oauth_tokens = oauth.fetch_access_token(access_token_url) flask.session["owner_key"] = oauth_tokens.get("oauth_token") flask.session["owner_secret"] = oauth_tokens.get("oauth_token_secret") r = oauth.get(osm_api_base + "/user/details") info = osm_oauth.parse_userinfo_call(r.content) user = model.User.query.filter_by(osm_id=info["id"]).one_or_none() if user: user.osm_oauth_token = oauth_tokens.get("oauth_token") user.osm_oauth_token_secret = oauth_tokens.get("oauth_token_secret") else: user = model.User( username=info["username"], description=info["description"], img=info["img"], osm_id=info["id"], osm_account_created=info["account_created"], mock_upload=False, ) database.session.add(user) database.session.commit() flask_login.login_user(user) next_page = flask.session.get("next") or flask.url_for("map_start_page") return flask.redirect(next_page) def validate_edit_list(edits): for e in edits: assert model.Item.get_by_qid(e["qid"]) assert e["op"] in {"add", "remove", "change"} osm_type, _, osm_id = e["osm"].partition("/") osm_id = int(osm_id) if osm_type == "node": assert model.Point.query.get(osm_id) else: src_id = osm_id if osm_type == "way" else -osm_id assert model.Line.query.get(src_id) or model.Polygon.query.get(src_id) @app.route("/api/1/edit", methods=["POST"]) def api_new_edit_session(): user = flask_login.current_user incoming = flask.request.json validate_edit_list(incoming["edit_list"]) es = model.EditSession( user=user, edit_list=incoming["edit_list"], comment=incoming["comment"] ) database.session.add(es) database.session.commit() session_id = es.id return cors_jsonify(success=True, session_id=session_id) @app.route("/api/1/edit/", methods=["POST"]) def api_edit_session(session_id): es = model.EditSession.query.get(session_id) assert flask_login.current_user.id == es.user_id incoming = flask.request.json for f in "edit_list", "comment": if f not in incoming: continue setattr(es, f, incoming[f]) database.session.commit() return cors_jsonify(success=True, session_id=session_id) class VersionMismatch(Exception): """Version doesn't match.""" def osm_object( osm_type: str, osm_id: int ) -> model.Point | model.Line | model.Polygon | None: """Get an OSM object from the database.""" if osm_type == "node": return model.Point.query.get(osm_id) src_id = int(osm_id) * {"way": 1, "relation": -1}[osm_type] for cls in model.Line, model.Polygon: obj = cls.query.get(src_id) if obj: return obj def process_edit(changeset_id, e): osm_type, _, osm_id = e["osm"].partition("/") qid = e["qid"] item_id = qid[1:] osm = osm_object(osm_type, osm_id) assert osm r = edit.get_existing(osm_type, osm_id) if r.status_code == 410 or r.content == b"": return "deleted" root = lxml.etree.fromstring(r.content) existing = root.find('.//tag[@k="wikidata"]') if e["op"] == "add" and existing is not None: return "already_added" if e["op"] == "remove": if existing is None: return "already_removed" if existing.get("v") != qid: return "different_qid" root[0].set("changeset", str(changeset_id)) if e["op"] == "add": tag = lxml.etree.Element("tag", k="wikidata", v=qid) root[0].append(tag) if e["op"] == "remove": root[0].remove(existing) if e["op"] == "change": existing.set("v", qid) element_data = lxml.etree.tostring(root) try: success = edit.save_element(osm_type, osm_id, element_data) except requests.exceptions.HTTPError as e: if e.response.status_code == 409 and "Version mismatch" in r.text: raise VersionMismatch mail.error_mail( "error saving element", element_data.decode("utf-8"), e.response ) database.session.commit() return "element-error" if not success: return "element-error" new_tags = dict(osm.tags) if e["op"] in ("add", "change"): new_tags["wikidata"] = qid if e["op"] == "remove": del new_tags["wikidata"] cls = type(osm) database.session.execute( update(cls).where(cls.src_id == osm.src_id).values(tags=new_tags) ) db_edit = model.ChangesetEdit( changeset_id=changeset_id, item_id=item_id, osm_id=osm_id, osm_type=osm_type, ) database.session.add(db_edit) database.session.commit() return "saved" @app.route("/api/1/save/") def api_save_changeset(session_id: int): assert flask.g.user.is_authenticated mock = flask.g.user.mock_upload api_call = api_mock_save_changeset if mock else api_real_save_changeset return api_call(session_id) @app.route("/sql", methods=["GET", "POST"]) def run_sql() -> str: """Web form where the user can run an SQL query.""" if flask.request.method != "POST": return flask.render_template("run_sql.html") sql = flask.request.form["sql"] conn = database.session.connection() result = conn.execute(sqlalchemy.text(sql)) return flask.render_template("run_sql.html", result=result) def api_real_save_changeset(session_id): es = model.EditSession.query.get(session_id) def send(event, **data): data["type"] = event return f"data: {json.dumps(data)}\n\n" def stream(user): changeset = edit.new_changeset(es.comment) r = edit.create_changeset(changeset) reply = r.text.strip() if reply == "Couldn't authenticate you": mail.open_changeset_error(session_id, changeset, r) yield send("auth-fail", error=reply) return if not reply.isdigit(): mail.open_changeset_error(session_id, changeset, r) yield send("changeset-error", error=reply) return changeset_id = int(reply) yield send("open", id=changeset_id) update_count = 0 change = edit.record_changeset( id=changeset_id, user=user, comment=es.comment, update_count=update_count ) # each edit contains these keys: # qid: Wikidata item QID # osm: OpenStreetMap identifier # op: either 'add' or 'remove' for num, e in enumerate(es.edit_list): print(num, e) yield send("progress", edit=e, num=num) result = process_edit(changeset_id, e) yield send(result, edit=e, num=num) if result == "saved": update_count += 1 change.update_count = update_count database.session.commit() yield send("closing") edit.close_changeset(changeset_id) yield send("done") return flask.Response( flask.stream_with_context(stream(flask.g.user)), mimetype="text/event-stream" ) def api_mock_save_changeset(session_id): es = model.EditSession.query.get(session_id) def send(event, **data): data["type"] = event return f"data: {json.dumps(data)}\n\n" def stream(user): print("stream") changeset_id = database.session.query(func.max(model.Changeset.id) + 1).scalar() sleep(1) yield send("open", id=changeset_id) sleep(1) update_count = 0 print("record_changeset", changeset_id) edit.record_changeset( id=changeset_id, user=user, comment=es.comment, update_count=update_count ) print("edits") for num, e in enumerate(es.edit_list): print(num, e) yield send("progress", edit=e, num=num) sleep(1) yield send("saved", edit=e, num=num) sleep(1) print("closing") yield send("closing") sleep(1) yield send("done") return flask.Response(stream(flask.g.user), mimetype="text/event-stream") if __name__ == "__main__": app.run(host="0.0.0.0")