How to fetch and display arbitrary log files from a managed host?

We are creating a small management portal for a custom application and need a way to display, in a browser, the contents of an arbitrary log file located on an EM managed host. The effect we are looking for is similar to what you get when you show the contents of a database alert log using EM.
I want to extend the EM agent to get the log and display the contents, but see two problems: (1) it seems like we would have to schedule the fetch of the log contents to happen on a regular basis and would not be able to do it on demand and (2) storing the results in the EM repository seems like it could consume a pile of storage, even if it only stores the logs for 24 hours.
I am pretty sure we can bypass the repository somehow because I think the "show database alert log" EM process does so. Of course, I can't really be sure how this code is getting the alert log, but it seems reasonable to assume it is using the management agent.
Is there some API for the EM Agent that I am missing?
Any ideas would be appreciated.

From within OEM it doesnt look possible. User defined metrics (UDM) can only return number or a string. The alertlog fetch is done via alertlogViewer.pl while being passed a couple of parameters.
OEM does have a preliminary/rough api available at http://www.oracle.com/technology/products/oem/emx/index.html but I havent seen anyone make use of it yet.
If you use just a web connection then you will probably run into security issues as a web server can usually only view/access stuff under their htmldoc dir.
Seems like some non-OEM very custom code is what you seek..

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