• Dridi Boukelmoune's avatar
    varnishtest: New tunnel command · e1e52264
    Dridi Boukelmoune authored
    The tunnel acts like a client and a server and forwards bytes between
    two parties. It can then pause in the middle of a session and control
    how much data can go in either direction. Combined with barriers it can
    be used to trigger socket timeouts, possibly in the middle of protocol
    frames.
    
    A tunnel works with two threads: one to execute its spec and one to poll
    both parties and transfer data accordingly. The two threads synchronize
    via basic pthread primitives and follow a very simplistic state machine:
    
        ACCEPT -> RUNNING <-> PAUSED -> SPEC DONE -> POLL DONE -> STOPPED
    
    Despite being simplistic, the coordination of two threads would likely
    complicate the implementation of a `-repeat` action, but it is still
    possible to `start` a tunnel again as shown in the c106 test case that
    exercises basic coverage involving a varnish instance.
    
    Usage is documented in the vtc(7) manual.
    e1e52264
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