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Created a pointer Command.rdx (Redox*) to allow commands to increment Redox.cmd_count, and simplify a couple of other things. Did a little bit of moving and renaming context objects, so the context is always .ctx and commands can always be called c.
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Added Command<nullptr_t> which successfully returns NIL replies from Redis, with REDOX_OK. Also renamed constants from REDISX_ -> REDOX_. Moved a bunch of code from redox.cpp into command.cpp, where it logically makes more sense.
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Move as much as possible into the .cpp file, and clean things up.
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Found out that ev_timer watchers have a void* data that allows currying information to the libev callbacks! That means I could stick the Command* in there and completely get rid of the global timer_callbacks map that was needed before. Additionally, we can move ev_timer into the Command object instead of separately allocating it on the heap. Simplifies management. Implemented a synchronous loop speed test based on the latest and greatest command_blocking(). Happy to see it is around 30k/s, which is 100% network delays.
