ISSUE-18 Docker composition for YAMZ

[lewismc]

Hi @jkunze @nassibnassar this PR is as far as I have got with upgrading the codebase to Python 3.X and to providing the Docker composition.
The glaring issue is that I am unsure as to how to reach the static and template HTML code in html/* from the Flask constructor.

The first step is to build the composition

$ docker-compose build

Then deploy the stack

docker-compose up

...however when deploying locally, I get the following stack trace

Starting yamz_nassibnassar_postgres_1 ... done
Recreating yamz_nassibnassar_yamz_1   ... done
Starting yamz_nassibnassar_pgadmin4_1 ... done
Attaching to yamz_nassibnassar_postgres_1, yamz_nassibnassar_pgadmin4_1, yamz_nassibnassar_yamz_1
postgres_1  | 2018-09-12 01:37:24.828 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
postgres_1  | 2018-09-12 01:37:24.828 UTC [1] LOG:  listening on IPv6 address "::", port 5432
pgadmin4_1  | [2018-09-12 01:37:25 +0000] [1] [INFO] Starting gunicorn 19.8.1
pgadmin4_1  | [2018-09-12 01:37:25 +0000] [1] [INFO] Listening at: http://[::]:80 (1)
pgadmin4_1  | [2018-09-12 01:37:25 +0000] [1] [INFO] Using worker: threads
postgres_1  | 2018-09-12 01:37:24.831 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
pgadmin4_1  | [2018-09-12 01:37:25 +0000] [10] [INFO] Booting worker with pid: 10
postgres_1  | 2018-09-12 01:37:24.844 UTC [24] LOG:  database system was shut down at 2018-09-12 01:37:18 UTC
postgres_1  | 2018-09-12 01:37:24.850 UTC [1] LOG:  database system is ready to accept connections
yamz_1      | ice: starting ...
yamz_1      | Table Users pool: ([], 1001)
yamz_1      | Table Terms pool: ([], 1001)
yamz_1      | Table Comments pool: ([], 1001)
yamz_1      | ice: setup complete.
yamz_1      |  * Serving Flask app "ice" (lazy loading)
yamz_1      |  * Environment: production
yamz_1      |    WARNING: Do not use the development server in a production environment.
yamz_1      |    Use a production WSGI server instead.
yamz_1      |  * Debug mode: on
yamz_1      |  * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 200 -
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET /?__debugger__=yes&cmd=resource&f=jquery.js HTTP/1.1" 200 -
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET /?__debugger__=yes&cmd=resource&f=ubuntu.ttf HTTP/1.1" 200 -
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 200 -
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 200 -
yamz_1      | 172.19.0.1 - - [12/Sep/2018 01:37:36] "GET / HTTP/1.1" 500 -
yamz_1      | Traceback (most recent call last):
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2309, in __call__
yamz_1      |     return self.wsgi_app(environ, start_response)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2295, in wsgi_app
yamz_1      |     response = self.handle_exception(e)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1741, in handle_exception
yamz_1      |     reraise(exc_type, exc_value, tb)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
yamz_1      |     raise value
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
yamz_1      |     response = self.full_dispatch_request()
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
yamz_1      |     rv = self.handle_user_exception(e)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1713, in handle_user_exception
yamz_1      |     return self.handle_http_exception(e)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1644, in handle_http_exception
yamz_1      |     return handler(e)
yamz_1      |   File "/usr/src/app/ice.py", line 174, in pageNotFound
yamz_1      |     content = "The page you requested doesn't exist."), 404
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/templating.py", line 134, in render_template
yamz_1      |     return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list),
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/jinja2/environment.py", line 869, in get_or_select_template
yamz_1      |     return self.get_template(template_name_or_list, parent, globals)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/jinja2/environment.py", line 830, in get_template
yamz_1      |     return self._load_template(name, self.make_globals(globals))
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/jinja2/environment.py", line 804, in _load_template
yamz_1      |     template = self.loader.load(self, name, globals)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/jinja2/loaders.py", line 113, in load
yamz_1      |     source, filename, uptodate = self.get_source(environment, name)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/templating.py", line 58, in get_source
yamz_1      |     return self._get_source_fast(environment, template)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/templating.py", line 81, in _get_source_fast
yamz_1      |     for srcobj, loader in self._iter_loaders(template):
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/templating.py", line 89, in _iter_loaders
yamz_1      |     loader = self.app.jinja_loader
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/helpers.py", line 861, in __get__
yamz_1      |     value = self.func(obj)
yamz_1      |   File "/usr/local/lib/python3.7/site-packages/flask/helpers.py", line 936, in jinja_loader
yamz_1      |     self.template_folder))
yamz_1      |   File "/usr/local/lib/python3.7/posixpath.py", line 94, in join
yamz_1      |     genericpath._check_arg_types('join', a, *p)
yamz_1      |   File "/usr/local/lib/python3.7/genericpath.py", line 149, in _check_arg_types
yamz_1      |     (funcname, s.__class__.__name__)) from None
yamz_1      | TypeError: join() argument must be str or bytes, not 'bool'

Does someone else know how to ensure that the static files are served via http://0.0.0.0:5000/ ?