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| ## page was renamed from SageNotebook = The Sage Notebook Server: A Technical Overview = This document gives a technical overview of the new Sage Notebook server, including how it responds to user requests, delegates tasks, etc. See [[http://trac.sagemath.org/sage_trac/ticket/6983 | #6983]] for instructions on trying out the new server. Serving up pages * All access goes through `guard.py`. * `locateChild` checks authentication. * If the user is authenticated, `locateResource` is called to get the appropriate page. * `locateResource`, in turn, uses the `LoginSystem` class in `avatars.py` to get the appropriate resource. * `LoginSystem` calls the appropriate function in `twist.py`. * Which would be `AdminTopLevel`, `UserTopLevel`, `FailedTopLevel`, or `AnonymousTopLevel`, depending on the user type. * The `*TopLevel` resources generate child resources based on their `childFactory` methods. * Each resource represents a segment of the URL. * Thus `'/'` is the `TopLevel` resource, and `'/home/'` is mapped to the `Worksheets` resource, etc. * The tree is traversed until a leaf is reached, then the leaf's `render` method is called. Cell Evaluation * Evaluation occurs when `Worksheet_eval` is called. * Evaluation only happens if the user has permissions to evaluate the cell. * The cell's `evaluate` method is called. * `evaluate` adds itself to the worksheet's job queue using `Worksheet#enqueue`, which also calls `Worksheet#start_next_comp`. * If the cell is marked for introspection, set `input` to be evaluated to the part before introspection is requested. Otherwise, set `input` to the whole cell. * Get a reference to an instance of Sage for computation using `Worksheet#sage`. Currently, `WorksheetProcess_ExpectImplementation` from `interfaces/expect.py` is used. * Executes `input` with that instance. * Updates cell content. |
