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# -*- coding: utf-8 -*-
import json
import logging
import os
try:
import queue
except ImportError:
import Queue as queue
try:
import socketserver
except ImportError:
import SocketServer as socketserver
from apscheduler.schedulers.background import BackgroundScheduler
from datetime import datetime, timedelta
from flask import (
Flask,
render_template,
Response,
request,
abort,
jsonify,
send_from_directory,
)
from flask_assets import Environment, Bundle
from flask.templating import TemplateNotFound
from jobs import load_jobs
from random import randint
class Jarvis(Flask):
def __init__(self, name):
Flask.__init__(self, name)
self.logger.setLevel(logging.INFO)
self.jinja_env.trim_blocks = True
self.jinja_env.lstrip_blocks = True
self.sched = BackgroundScheduler(logger=self.logger)
self.queues = {}
self.last_events = {}
self.widgets_path = os.path.abspath(
os.path.join(os.path.dirname(__file__), "static", "widgets")
)
def wsgi_app(self, *args, **kwargs):
_configure_bundles(self)
_schedule_jobs(self)
return super().wsgi_app(*args, **kwargs)
app = Jarvis(__name__)
def _configure_bundles(app):
js = ["main.js"]
css = ["main.css"]
for widget in os.listdir(app.widgets_path):
widget_path = os.path.join("widgets", widget)
for asset_file in os.listdir(os.path.join(app.widgets_path, widget)):
asset_path = os.path.join(widget_path, asset_file)
if asset_file.endswith(".js"):
js.append(asset_path)
elif asset_file.endswith(".css"):
css.append(asset_path)
assets = Environment(app)
if app.debug:
assets.register("js_all", Bundle(*js, output="gen/app.js"))
assets.register("css_all", Bundle(*css, output="gen/styles.css"))
else:
assets.register(
"js_min_all", Bundle(*js, filters="rjsmin", output="gen/app.min.js")
)
assets.register(
"css_min_all", Bundle(*css, filters="cssmin", output="gen/styles.min.css")
)
@app.route("/w/<job_id>")
@app.route("/widget/<job_id>")
def widget(job_id):
if not _is_enabled(job_id):
abort(404)
x = request.args.get("x", 3)
widgets = _enabled_jobs()
# Use the widget matching the job implementation, or an explicitly declared
# widget
job = _config()["JOBS"][job_id]
widget = job.get("job_impl", job_id)
widget = job.get("widget", widget)
return render_template(
"index.html",
layout="layout_single.html",
widget=widget,
job=job_id,
x=x,
widgets=widgets,
)
@app.route("/widget/<widget>/<filename>")
def widget_files(widget, filename):
public_path = os.path.join(app.widgets_path, widget, "public")
return send_from_directory(public_path, filename)
@app.route("/")
@app.route("/d/<layout>")
@app.route("/dashboard/<layout>")
def dashboard(layout=None):
locale = request.args.get("locale")
widgets = _enabled_jobs()
layout = layout or _config().get("DEFAULT_LAYOUT")
if layout is None:
return render_template("index.html", locale=locale, widgets=widgets)
try:
return render_template(
"index.html",
layout="layouts/{0}.html".format(layout),
locale=locale,
widgets=widgets,
)
except TemplateNotFound:
abort(404)
@app.route("/widgets")
def widgets():
return jsonify(_enabled_jobs())
@app.route("/events")
def events():
remote_port = request.environ["REMOTE_PORT"]
current_queue = queue.Queue()
app.queues[remote_port] = current_queue
for event in app.last_events.values():
current_queue.put(event)
def consume():
while True:
data = current_queue.get()
if data is None:
break
yield "data: %s\n\n" % (data,)
response = Response(consume(), mimetype="text/event-stream")
response.headers["X-Accel-Buffering"] = "no"
return response
@app.route("/events/<job_id>", methods=["POST"])
def create_event(job_id):
if not _is_enabled(job_id):
abort(404)
body = request.get_json()
if not body:
abort(400)
_add_event(job_id, body)
return "", 201
def _config():
if app.testing: # tests set their own config
return app.config
app.config.from_envvar("JARVIS_SETTINGS")
return app.config
def _enabled_jobs():
config = _config()["JOBS"]
return [job_id for job_id in config.keys() if config[job_id].get("enabled")]
def _is_enabled(job_id):
return job_id in _enabled_jobs()
@app.context_processor
def _inject_template_methods():
return dict(is_job_enabled=_is_enabled)
@app.after_request
def _set_security_headers(response):
csp = (
"default-src 'none'; "
"connect-src 'self'; "
"img-src 'self' https://i.scdn.co; "
"script-src 'self' https://cdnjs.cloudflare.com; "
"style-src 'self' https://cdnjs.cloudflare.com https://fonts.googleapis.com; "
"font-src https://fonts.gstatic.com"
)
response.headers["Content-Security-Policy"] = csp
response.headers["X-Content-Type-Options"] = "nosniff"
response.headers["X-Frame-Options"] = "DENY"
response.headers["X-XSS-Protection"] = "1; mode=block"
return response
def _schedule_jobs(app):
offset = 0
jobs = load_jobs()
for job_id, job_config in _config()["JOBS"].items():
job_impl = job_config.get("job_impl", job_id)
if not job_config.get("enabled"):
app.logger.info("Skipping disabled job: %s", job_id)
continue
if job_impl not in jobs:
app.logger.info(
("Skipping job with ID %s (no such " "implementation: %s)"),
job_id,
job_impl,
)
continue
job = jobs[job_impl](job_config)
if app.debug:
start_date = datetime.now() + timedelta(seconds=1)
else:
offset += randint(4, 10)
start_date = datetime.now() + timedelta(seconds=offset)
job.start_date = start_date
app.logger.info(
"Scheduling job with ID %s (implementation: %s): %s", job_id, job_impl, job
)
app.sched.add_job(
_run_job,
"interval",
name=job_id,
next_run_time=job.start_date,
coalesce=True,
seconds=job.interval,
kwargs={"job_id": job_id, "job": job},
)
if not app.sched.running:
app.sched.start()
def _add_event(job_id, data):
json_data = json.dumps(
{"body": data, "job": job_id}, separators=(",", ":"), sort_keys=True
)
app.last_events[job_id] = json_data
for q in app.queues.values():
q.put(json_data)
def _run_job(job_id, job):
try:
data = job.get()
_add_event(job_id, data)
except Exception as e:
msg = "Failed to execute job: " + job_id + ": " + str(e)
if app.debug:
app.logger.warning(msg, e)
else:
# Skip logging stack trace
app.logger.warning(msg)
def _close_stream(*args, **kwargs):
remote_port = args[2][1]
if remote_port in app.queues:
del app.queues[remote_port]
socketserver.BaseServer.handle_error = _close_stream
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