blakeblackshear.frigate/frigate/http.py
2021-02-25 06:34:36 -06:00

382 lines
13 KiB
Python

import base64
import datetime
import json
import logging
import os
import time
from functools import reduce
import cv2
import gevent
import numpy as np
from flask import (Blueprint, Flask, Response, current_app, jsonify,
make_response, request)
from flask_sockets import Sockets
from peewee import SqliteDatabase, operator, fn, DoesNotExist
from playhouse.shortcuts import model_to_dict
from frigate.const import CLIPS_DIR
from frigate.models import Event
from frigate.stats import stats_snapshot
from frigate.util import calculate_region
from frigate.version import VERSION
logger = logging.getLogger(__name__)
bp = Blueprint('frigate', __name__)
ws = Blueprint('ws', __name__)
class MqttBackend():
"""Interface for registering and updating WebSocket clients."""
def __init__(self, mqtt_client, topic_prefix):
self.clients = list()
self.mqtt_client = mqtt_client
self.topic_prefix = topic_prefix
def register(self, client):
"""Register a WebSocket connection for Mqtt updates."""
self.clients.append(client)
def publish(self, message):
try:
json_message = json.loads(message)
json_message = {
'topic': f"{self.topic_prefix}/{json_message['topic']}",
'payload': json_message['payload'],
'retain': json_message.get('retain', False)
}
except:
logger.warning("Unable to parse websocket message as valid json.")
return
logger.debug(f"Publishing mqtt message from websockets at {json_message['topic']}.")
self.mqtt_client.publish(json_message['topic'], json_message['payload'], retain=json_message['retain'])
def run(self):
def send(client, userdata, message):
"""Sends mqtt messages to clients."""
try:
logger.debug(f"Received mqtt message on {message.topic}.")
ws_message = json.dumps({
'topic': message.topic.replace(f"{self.topic_prefix}/",""),
'payload': message.payload.decode()
})
except:
# if the payload can't be decoded don't relay to clients
logger.debug(f"MQTT payload for {message.topic} wasn't text. Skipping...")
return
for client in self.clients:
try:
client.send(ws_message)
except:
logger.debug("Removing websocket client due to a closed connection.")
self.clients.remove(client)
self.mqtt_client.message_callback_add(f"{self.topic_prefix}/#", send)
def start(self):
"""Maintains mqtt subscription in the background."""
gevent.spawn(self.run)
def create_app(frigate_config, database: SqliteDatabase, stats_tracking, detected_frames_processor, mqtt_client):
app = Flask(__name__)
sockets = Sockets(app)
@app.before_request
def _db_connect():
database.connect()
@app.teardown_request
def _db_close(exc):
if not database.is_closed():
database.close()
app.frigate_config = frigate_config
app.stats_tracking = stats_tracking
app.detected_frames_processor = detected_frames_processor
app.register_blueprint(bp)
sockets.register_blueprint(ws)
app.mqtt_backend = MqttBackend(mqtt_client, frigate_config.mqtt.topic_prefix)
app.mqtt_backend.start()
return app
@bp.route('/')
def is_healthy():
return "Frigate is running. Alive and healthy!"
@bp.route('/events/summary')
def events_summary():
has_clip = request.args.get('has_clip', type=int)
has_snapshot = request.args.get('has_snapshot', type=int)
clauses = []
if not has_clip is None:
clauses.append((Event.has_clip == has_clip))
if not has_snapshot is None:
clauses.append((Event.has_snapshot == has_snapshot))
if len(clauses) == 0:
clauses.append((1 == 1))
groups = (
Event
.select(
Event.camera,
Event.label,
fn.strftime('%Y-%m-%d', fn.datetime(Event.start_time, 'unixepoch', 'localtime')).alias('day'),
Event.zones,
fn.COUNT(Event.id).alias('count')
)
.where(reduce(operator.and_, clauses))
.group_by(
Event.camera,
Event.label,
fn.strftime('%Y-%m-%d', fn.datetime(Event.start_time, 'unixepoch', 'localtime')),
Event.zones
)
)
return jsonify([e for e in groups.dicts()])
@bp.route('/events/<id>')
def event(id):
try:
return model_to_dict(Event.get(Event.id == id))
except DoesNotExist:
return "Event not found", 404
@bp.route('/events/<id>/thumbnail.jpg')
def event_thumbnail(id):
format = request.args.get('format', 'ios')
thumbnail_bytes = None
try:
event = Event.get(Event.id == id)
thumbnail_bytes = base64.b64decode(event.thumbnail)
except DoesNotExist:
# see if the object is currently being tracked
try:
for camera_state in current_app.detected_frames_processor.camera_states.values():
if id in camera_state.tracked_objects:
tracked_obj = camera_state.tracked_objects.get(id)
if not tracked_obj is None:
thumbnail_bytes = tracked_obj.get_thumbnail()
except:
return "Event not found", 404
if thumbnail_bytes is None:
return "Event not found", 404
# android notifications prefer a 2:1 ratio
if format == 'android':
jpg_as_np = np.frombuffer(thumbnail_bytes, dtype=np.uint8)
img = cv2.imdecode(jpg_as_np, flags=1)
thumbnail = cv2.copyMakeBorder(img, 0, 0, int(img.shape[1]*0.5), int(img.shape[1]*0.5), cv2.BORDER_CONSTANT, (0,0,0))
ret, jpg = cv2.imencode('.jpg', thumbnail, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
thumbnail_bytes = jpg.tobytes()
response = make_response(thumbnail_bytes)
response.headers['Content-Type'] = 'image/jpg'
return response
@bp.route('/events/<id>/snapshot.jpg')
def event_snapshot(id):
jpg_bytes = None
try:
event = Event.get(Event.id == id)
if not event.has_snapshot:
return "Snapshot not available", 404
# read snapshot from disk
with open(os.path.join(CLIPS_DIR, f"{event.camera}-{id}.jpg"), 'rb') as image_file:
jpg_bytes = image_file.read()
except DoesNotExist:
# see if the object is currently being tracked
try:
for camera_state in current_app.detected_frames_processor.camera_states.values():
if id in camera_state.tracked_objects:
tracked_obj = camera_state.tracked_objects.get(id)
if not tracked_obj is None:
jpg_bytes = tracked_obj.get_jpg_bytes(
timestamp=request.args.get('timestamp', type=int),
bounding_box=request.args.get('bbox', type=int),
crop=request.args.get('crop', type=int),
height=request.args.get('h', type=int)
)
except:
return "Event not found", 404
except:
return "Event not found", 404
response = make_response(jpg_bytes)
response.headers['Content-Type'] = 'image/jpg'
return response
@bp.route('/events')
def events():
limit = request.args.get('limit', 100)
camera = request.args.get('camera')
label = request.args.get('label')
zone = request.args.get('zone')
after = request.args.get('after', type=float)
before = request.args.get('before', type=float)
has_clip = request.args.get('has_clip', type=int)
has_snapshot = request.args.get('has_snapshot', type=int)
include_thumbnails = request.args.get('include_thumbnails', default=1, type=int)
clauses = []
excluded_fields = []
if camera:
clauses.append((Event.camera == camera))
if label:
clauses.append((Event.label == label))
if zone:
clauses.append((Event.zones.cast('text') % f"*\"{zone}\"*"))
if after:
clauses.append((Event.start_time >= after))
if before:
clauses.append((Event.start_time <= before))
if not has_clip is None:
clauses.append((Event.has_clip == has_clip))
if not has_snapshot is None:
clauses.append((Event.has_snapshot == has_snapshot))
if not include_thumbnails:
excluded_fields.append(Event.thumbnail)
if len(clauses) == 0:
clauses.append((1 == 1))
events = (Event.select()
.where(reduce(operator.and_, clauses))
.order_by(Event.start_time.desc())
.limit(limit))
return jsonify([model_to_dict(e, exclude=excluded_fields) for e in events])
@bp.route('/config')
def config():
return jsonify(current_app.frigate_config.to_dict())
@bp.route('/version')
def version():
return VERSION
@bp.route('/stats')
def stats():
stats = stats_snapshot(current_app.stats_tracking)
return jsonify(stats)
@bp.route('/<camera_name>/<label>/best.jpg')
def best(camera_name, label):
if camera_name in current_app.frigate_config.cameras:
best_object = current_app.detected_frames_processor.get_best(camera_name, label)
best_frame = best_object.get('frame')
if best_frame is None:
best_frame = np.zeros((720,1280,3), np.uint8)
else:
best_frame = cv2.cvtColor(best_frame, cv2.COLOR_YUV2BGR_I420)
crop = bool(request.args.get('crop', 0, type=int))
if crop:
box = best_object.get('box', (0,0,300,300))
region = calculate_region(best_frame.shape, box[0], box[1], box[2], box[3], 1.1)
best_frame = best_frame[region[1]:region[3], region[0]:region[2]]
height = int(request.args.get('h', str(best_frame.shape[0])))
width = int(height*best_frame.shape[1]/best_frame.shape[0])
best_frame = cv2.resize(best_frame, dsize=(width, height), interpolation=cv2.INTER_AREA)
ret, jpg = cv2.imencode('.jpg', best_frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
response = make_response(jpg.tobytes())
response.headers['Content-Type'] = 'image/jpg'
return response
else:
return "Camera named {} not found".format(camera_name), 404
@bp.route('/<camera_name>')
def mjpeg_feed(camera_name):
fps = int(request.args.get('fps', '3'))
height = int(request.args.get('h', '360'))
draw_options = {
'bounding_boxes': request.args.get('bbox', type=int),
'timestamp': request.args.get('timestamp', type=int),
'zones': request.args.get('zones', type=int),
'mask': request.args.get('mask', type=int),
'motion_boxes': request.args.get('motion', type=int),
'regions': request.args.get('regions', type=int),
}
if camera_name in current_app.frigate_config.cameras:
# return a multipart response
return Response(imagestream(current_app.detected_frames_processor, camera_name, fps, height, draw_options),
mimetype='multipart/x-mixed-replace; boundary=frame')
else:
return "Camera named {} not found".format(camera_name), 404
@bp.route('/<camera_name>/latest.jpg')
def latest_frame(camera_name):
draw_options = {
'bounding_boxes': request.args.get('bbox', type=int),
'timestamp': request.args.get('timestamp', type=int),
'zones': request.args.get('zones', type=int),
'mask': request.args.get('mask', type=int),
'motion_boxes': request.args.get('motion', type=int),
'regions': request.args.get('regions', type=int),
}
if camera_name in current_app.frigate_config.cameras:
# max out at specified FPS
frame = current_app.detected_frames_processor.get_current_frame(camera_name, draw_options)
if frame is None:
frame = np.zeros((720,1280,3), np.uint8)
height = int(request.args.get('h', str(frame.shape[0])))
width = int(height*frame.shape[1]/frame.shape[0])
frame = cv2.resize(frame, dsize=(width, height), interpolation=cv2.INTER_AREA)
ret, jpg = cv2.imencode('.jpg', frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
response = make_response(jpg.tobytes())
response.headers['Content-Type'] = 'image/jpg'
return response
else:
return "Camera named {} not found".format(camera_name), 404
def imagestream(detected_frames_processor, camera_name, fps, height, draw_options):
while True:
# max out at specified FPS
gevent.sleep(1/fps)
frame = detected_frames_processor.get_current_frame(camera_name, draw_options)
if frame is None:
frame = np.zeros((height,int(height*16/9),3), np.uint8)
width = int(height*frame.shape[1]/frame.shape[0])
frame = cv2.resize(frame, dsize=(width, height), interpolation=cv2.INTER_LINEAR)
ret, jpg = cv2.imencode('.jpg', frame, [int(cv2.IMWRITE_JPEG_QUALITY), 70])
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + jpg.tobytes() + b'\r\n\r\n')
@ws.route('/ws')
def echo_socket(socket):
current_app.mqtt_backend.register(socket)
while not socket.closed:
# Sleep to prevent *constant* context-switches.
gevent.sleep(0.1)
message = socket.receive()
if message:
current_app.mqtt_backend.publish(message)