allow for overflow worker start failure #124
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Fixes the issue that failure to start an overflow worker in response to a checkout crashes a pool. Instead, this now raises an exit exception in the client.
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As described in #122, if an overflow worker was unable to start (which may always happen owing to circumstances), the
poolboygen_serverwould crash, because it invariably expects{ok, Pid}to be returned fromsupervisor:start_child/2in thenew_worker/1function. That is even though the spec for thepoolboy_worker:start_link/1callback function explicitly allows{error, term()}to be returned.This PR changes this in that it really allows error tuples to be returned from the worker start functions. If an overflow worker fails to start in response to a
checkoutortransactionrequest, anexitexception will be raised in the client instead. Failure to start a residual worker on pool start, or restart of an exited residual worker, will still cause a crash of the pool as before. I think that is what is to be expected, and it can be provided for when needed with the other PR (#123) that I recently submitted.