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* Remove the authentication requirement on GET operation
* "main.js": Redirect to the login page if POST response 403 forbidden
* "main.js": Use global AJAX events handling instead of `$.ajaxSetup()`
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* Rename to "ConsoleAJAXHandler"
* Change to use the request/response model, which accepts the AJAX
request and then response.
* Update logging handler to push messages to all connected clients
* Many simplifications and rewrites.
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Also change the pushed messages to have "action=push" and "subtype=log"
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* Add new attributes "executor" and "task_status" for "console.py"
* Define an option for the "executor"
* Rename attribute "ws_clients" to "websockets"
* Update docstring and comments
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See the docstring for more details.
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NOTE:
By using the "tornado.options", each module can defines its own
options, which are added to the global namespace.
And the defined options can also be used by other modules.
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The "exists" action through the GET request will check the existence of
the specified filepath (which should be an absolute path).
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The handling of "configs" and "console" types of messages, will be
changed to implement using the AJAX techniques.
The basic WebSocket communication is too low-level, and there is no easy
way to relate each received message to the corresponding sent message.
There are high-level sub-protocols exists (e.g., WAMP [1]) to allow the
RPC (remote procedure call) and publish/subscribe operations, however,
the Tornado web framework current does not support them, and another
client JavaScript library is also required.
Using the more traditional AJAX techniques allow the request-response
model and sequential operations (e.g., jQuery deferred and promises) be
easily implemented. Therefore better operation interaction and
reflection and error handling is achieved.
[1]: WAMP: Web Application Messaging Protocl, http://wamp-proto.org/
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NOTE:
These two AJAX handlers are currently not finished!
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Split "ConfigsHandler" from "FG21simWSHandler" as "handlers/configs.py"
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Move the "IndexHandler" to separate module located at the "handlers/"
directory.
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