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This implements a client/server split for blackmatch, where the client implements the fuse_main bindings and a simple blocking rpc client mechanism. The server implements the other half of that rpc mechanism, and contains all the actual logic for interpreting fuse requests in the context of the on disk cache and requests to the tahoe node. The server is based on a twisted reactor. The rpc mechanism implements a simple method dispatch including marshalling, using json, of basic inert data types, in a flat namespace (no objects). The client side is written in a blocking idiom, to interface with the threading model used by the fuse_main bindings, whereas the server side is written for a twisted reactor-based environment, intended to facilitate implementing more sophisticated logic in that paradigm. The two communicate over a unix domain socket, allocated within the nodedir. Command line usage is unchanged; the server is launched automatically by the client. The server daemonizes itself, to avoid preventing the original parent process (e.g. 'runtests') from waiting upon the server exiting. The client keeps open a 'keepalive' connection to the server; upon loss thereof the server will exit. This addresses the fact that the python-fuse bindings provide no notification of exit of the client process upon unmount. The client thus provides a relatively thin 'shim' proxying requests from the fuse_main bindings across the rpc to the server process, which handles the logic behind each request. For the time being, a '--no-split' option is provided to surpress the splitting into client/server, yielding the prior behaviour. Once the server logic gets more complex and more entrenched in a twisted idiom, this might be removed. The 'runtests' test harness currently tests both modes, as 'impl_c' and 'impl_c_no_split' |
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This directory contains code and extensions which are not strictly a part of Tahoe. They may or may not currently work.