eventman/docs/DEVELOPMENT.md

Development

As of July 2016, EventMan(ager) is under heavy refactoring. For a list of main changes that will be introduced, see https://github.com/raspibo/eventman/issues

Every contribution, in form of code or ideas, is welcome.

Definitions

• event: a faire, convention, congress or any other kind of meeting
• person: everyone hates them
• registered person: someone who said will attend at the event
• attendee: a person who actually show up (is checked in) at the event
• ticket: an entry in the list of persons registered at an event (one ticket, one registered person)
• user: a logged in user of the EventMan(ager) web interface (not the same as "person")
• trigger: an action that will cause the execution of some scripts

Paths

Webapp

These are the paths you see in the browser (AngularJS does client-side routing: no request is issued to the web server, during navigation, if not for fetching data and issuing commands):

• /#/events - the list of events
• /#/event/new - edit form to create a new event
• /#/event/:event_id/edit - edit form to modify an existing event
• /#/event/:event_id/view - show read-only information about an existing event
• /#/event/:event_id/tickets - show the list of persons registered at the event
• /#/event/:event_id/ticket/new - add a new ticket to an event
• /#/event/:event_id/ticket/:ticket_id/edit - edit an existing ticket
• /#/users - the list of users
• /#/user/:user_id/edit - edit an existing user (contains the list of events the user registered for)
• /#/import/persons - form used to import persons in bulk
• /#/login - login and new user forms
• /logout - when visited, the user is logged out

Web server

The paths used to communicate with the Tornado web server:

• /events GET - return the list of events
• /events POST - store a new event
• /events/:event_id GET - return information about an existing event
• /events/:event_id PUT - update an existing event
• /events/:event_id DELETE - delete an existing event
• /events/:event_id/tickets GET - return the complete list of tickets of the event
• /events/:event_id/tickets POST - add a new ticket to this event
• /events/:event_id/tickets/:ticket_id GET - return a ticket (e.g.: name, surname, ticket ID, ...)
• /events/:event_id/tickets/:ticket_id PUT - update a ticket (e.g.: if the ticket attended)
• /events/:event_id/tickets/:ticket_id DELETE - remove the entry from the list of registered tickets
• /users GET - list of users
• /users POST - create a new user
• /users/:user_id PUT - update an existing user
• /settings GET - settings to customize the GUI (logo, extra columns for events and tickets lists)
• /info GET - information about the current user
• /ebcsvpersons POST - csv file upload to import persons
• /login POST - log a user in
• /logout GET - when visited, the user is logged out

Notice that the above paths are the ones used by the webapp. If you plan to use them from an external application (like the event_man barcode/qrcode scanner) you better prepend all the path with /v1.0, where 1.0 is the current value of API_VERSION. The main advantage of doing so is that, for every call, a useful status code and a JSON value is returned.

Also, remember that most of the paths can take query parameters that will be used as a filter, like GET /events/:event_id/tickets?name=Mario

Permissions

Being too lazy to implement a proper MAC or RBAC, we settled to a simpler mapping on CRUD operations on paths. This will probably change in the future.

User's permission are stored in the permission key, and merged with a set of defaults, valid also for unregistered users. Operations are read, create, update and delete (plus the spcial all value). There's also the special admin|all value: if present, the user has every privilege.

Permissions are strings: the path and the permission are separated by |; the path components (resource:sub-resource, if any) are separated by :. In case we are not accessing a specific sub-resource (i.e.: we don't have a sub-resource ID), the -all string is appended to the resource name. For example:

• events|read: ability to retrieve the list of events and their data (some fields, like the list of registered persons, are filtered out if you don't have other permissions)
• event:tickets|all: ability to do everything to a ticket (provided that you know its ID)
• event:tickets-all|create: ability to create a new ticket (you don't have an ID, if you're creating a new ticket, hence the -all suffix)

Triggers

Sometimes we have to execute one or more scripts in reaction to an action.

In the data/triggers we have a series of directories; scripts inside of them will be executed when the related action was performed on the GUI or calling the controller.

Available triggers:

• update_ticket_in_event: executed every time a ticket in a given event is updated.
• attends: executed only when a person is marked as attending an event.

update_ticket_in_event and attends will receive these information:

• via environment:
  • NAME
  • SURNAME
  • EMAIL
  • COMPANY
  • JOB
  • TICKET_ID
  • EVENT_ID
  • EVENT_TITLE
  • SEQ
  • SEQ_HEX
• via stdin, a dictionary containing:
  • dictionary old with the old data of the ticket
  • dictionary new with the new data of the ticket
  • dictionary event with the event information
  • boolean merged, true if the data was updated

In the data/triggers-available there is an example of script: echo.py.

Database layout

Information are stored in MongoDB. Whenever possible, object are converted into native ObjectId.

events collection

Stores information about events and tickets.

Main field:

• title
• begin-data
• begin-time
• end-date
• end-time
• summary
• description
• where
• group_id
• tickets - a list of information about tickets (each entry is a ticket)
  • tickets.$._id
  • tickets.$.ticket_id
  • tickets.$.attended
  • tickets.$.name
  • tickets.$.surname
  • tickets.$.email
  • tickets.$.company
  • tickets.$.job
  • tickets.$.ebqrcode
  • tickets.$.seq
  • tickets.$.seq_hex

Notice that all the fields used to identiy a person (name, surname, email) depends on how you've edited the event's form.

users collection

Contains a list of username and associated values, like the password used for authentication.

To generate the hash, use: import utils print utils.hash_password('MyVerySecretPassword')

Code layout

The code is so divided:

+- eventman\_server.py - the Tornado Web server
+- backend.py - stuff to interact with MongoDB
+- utils.py - utilities
+- angular\_app/ - the client-side web application
|  |
|  +- *.html - AngularJS templates
|  +- Gruntfile.js - Grunt file to extract i18n strings
|  +- js/*.js - AngularJS code
|     |
|     +- app.js - main application and routing
|     +- controllers.js - controllers of the templates
|     +- services.js - interaction with the web server
|     +- directives.js - stuff to interact with the DOM
|     +- filters.js - filtering data
|     +- i18n.js - i18n
+- data/
|  |
|  +- triggers/
|     |
|     +- triggers-available/ - various trigger scripts
|     +- triggers/ enabled trigger scripts
|        |
|        +- attends.d/ - scripts to be executed when a person is marked as an attendee
|        +- create\_ticket\_in\_event.d/ - scripts that are run when a ticket is created
|        +- update\_ticket\_in\_event.d/ - scripts that are run when a ticket is updated
|        +- delete\_ticket\_in\_event.d/ - scripts that are run when a ticket is deleted
+- ssl/ - put here your eventman\_cert.pem  and eventman\_key.pem certs
+- static/
|  |
|  +- js/ - every third-party libraries (plus eventman.js with some small utils)
|  +- css/ - third-party CSS (plus eventman.css)
|  +- fonts/ - third-party fonts
|  +- images/ - third-party images
|  +- i18n/ - i18n files
+- templates/ - Tornado Web templates (not used
+- tests/ - eeeehhhh

Coding style and conventions

It's enough to be consistent within the document you're editing.

I suggest four spaces instead of tabs for all the code: Python (mandatory), JavaScript, HTML and CSS.

Python code documented following the Sphinx syntax.