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2020_RRP_argument_summary.md

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iframe call to render problem

Key value consumed in
src ... webwork2/html2xml? renderViaXMLRPC.pm
answersSubmitted 0
sourceFilePath Library/.../ filename.pg PG->new
problemSeed 43256/ PG_envir (envir)
courseID daemon_course WebworkWebservice
userID daemon WebworkWebservice
course_password daemon WebworkWebservice
showSummary FormatRenderedProblem
displayMode MathJax PG_envir
problemUUID 3243 PG_envir
language en PG_envir
outputformat libretexts FormatRenderedProblem
webworkJWT aaa.bbb.ccc encoded JWT immutable data

this GET request is received and preprocessed by renderViaXMLRPC

  • The GET arguments are in `%inputs_hash

  • Adjustments are made to key names to accomodate LTI calls (e.g. from Canvas)

    • for example custom_answerssubmitted => answersSubmitted

  • webworkClient is created with pass through values from input_hash

    key obtained from value consumed by
    site_url SITE_URL url of webworkwebservice site xmlrpcCall()
    site_password password for using webworkwebservice site
    form_action_url FORM_ACTION inserted into problem form for checking
    userID input_hash passthrough
    courseID input_hash passthrough
    course_password input_hash passthrough
    session_key input_hash returned by webworkwebservice, can be used instead of password
    outputformat input_hash passthrough
    webworkJWT input_hash passthrough
    input_hash %input_hash includes many pg_envir values

  • This hash is posted to the WebworkXMLRPC::renderProblem in Webworkwebservice.pm by xmlrpcCall()

  • $xmlrpc_client->xmlrpcCall(renderProblem, $xmlrpc_client->{input_hash}) )

  • notice that values in input_hash are being carried in parallel by as much as 3 channels: xmlrpc_client,xmlrpc_client->input_hash,input_hash (this needs pruning)

  • notice also that we don't need both webworkwebservice and webworkXMLRPC

WebworkXMLRPC::renderProblem

  • renderProblem first calls initiate_session which

    • creates WebworkXMLRPC object using values from the hash reference $rh_input.

    • |key | from | |----------|------| | courseName|$rh_input ->{courseID} | | user_id |$rh_input->{userID} | | password |$rh_input->{course_password}| |session_key | $rh_input ->{session_key}|

    • authenticates the user_id, courseName, password using the webwork2 authorization routines (slightly modified with a mixin)

  • The name changes are probably necessary to match values used in checking the authorization using the webwork legacy machinery

  • The method for calling the webwork2 code to authenticate is squirrly because it needs to interface with the webwork2 authentication methods. It needs to be checked -- how is it being done? is it being done? originally it was done by renaming some of the subroutines. (mixins) Is that still being done?

  • the initiate_session call returns an object whose do method performs the rendering

renderProblem {
...
my $self = $class->initiate_session($in);
return $self->do( WebworkWebservice::RenderProblem::renderProblem($self,$in) );
$self is a webworkXMLRPC object
  • The output of the do call is passed back as the return value for the xmlrpcCall()
    1. $self should be replaced with something like $webworkXMLRPCobject
    2. replace the do call with something more function oriented?

renderProblem process

  • input_hash to Webworkwebservice::RenderProblem::renderProblem()
  • call to PG::defineEnvironment
  • create a PG object (PG->new)
    • input hash to PG->new
    • PG object automatically processes the inputs and creates an output hash
    • output hash from PG->new

WebworkClient.pm

* we're back from the xmlrpcCall()
* feed the output of that to FormatRenderedProblem
* feed the output of FormatRenderedProblem back to renderViaXMLRPC
* feed the return value of that to the Browser

FormatRenderedProblem

  • uses a format template in WebworkClient directory