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https://github.com/urbit/shrub.git
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296 lines
8.1 KiB
Plaintext
296 lines
8.1 KiB
Plaintext
:: %behn, just a timer
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!:
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!? 164
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::
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=, behn
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|= pit=vase
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=> |%
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+$ move [p=duct q=(wind note gift:able)]
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+$ note :: out request $->
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$~ [%b %wait *@da] ::
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$% $: %b :: to self
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$>(%wait task:able) :: set timer
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== ::
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$: %d :: to %dill
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$>(%flog task:able:dill) :: log output
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== == ::
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+$ sign
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$~ [%b %wake ~]
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$% [%b $>(%wake gift:able)]
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==
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::
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+$ behn-state
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$: timers=(list timer)
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unix-duct=duct
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next-wake=(unit @da)
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drips=drip-manager
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==
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::
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+$ drip-manager
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$: count=@ud
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movs=(map @ud vase)
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==
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::
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+$ timer [date=@da =duct]
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--
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::
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=> |%
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++ per-event
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=| moves=(list move)
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|= [[our=ship now=@da =duct] state=behn-state]
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::
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|%
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:: %entry-points
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::
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:: +born: urbit restarted; refresh :next-wake and store wakeup timer duct
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::
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++ born set-unix-wake(next-wake.state ~, unix-duct.state duct)
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:: +crud: handle failure of previous arvo event
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::
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++ crud
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|= [tag=@tas error=tang]
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^+ [moves state]
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:: behn must get activated before other vanes in a %wake
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::
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:: TODO: uncomment this case after switching %crud tags
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::
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:: We don't know how to handle other errors, so relay them to %dill
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:: to be printed and don't treat them as timer failures.
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::
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:: ?. =(%wake tag)
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:: ~& %behn-crud-not-first-activation^tag
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:: [[duct %slip %d %flog %crud tag error]~ state]
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::
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?: =(~ timers.state) ~| %behn-crud-no-timer^tag^error !!
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::
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(wake `error)
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:: +rest: cancel the timer at :date, then adjust unix wakeup
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:: +wait: set a new timer at :date, then adjust unix wakeup
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::
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++ rest |=(date=@da set-unix-wake(timers.state (unset-timer [date duct])))
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++ wait |=(date=@da set-unix-wake(timers.state (set-timer [date duct])))
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:: +drip: XX
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::
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++ drip
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|= mov=vase
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=< [moves state]
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^+ event-core
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=. moves
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[duct %pass /drip/(scot %ud count.drips.state) %b %wait +(now)]~
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=. movs.drips.state
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(~(put by movs.drips.state) count.drips.state mov)
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=. count.drips.state +(count.drips.state)
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event-core
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:: +take-drip: XX
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::
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++ take-drip
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|= [num=@ud error=(unit tang)]
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=< [moves state]
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^+ event-core
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=/ drip (~(got by movs.drips.state) num)
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=. movs.drips.state (~(del by movs.drips.state) num)
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?^ error
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:: if we errored, drop it
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%- (slog leaf/"drip failed" u.error)
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event-core
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event-core(moves [duct %give %meta drip]~)
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:: +trim: in response to memory pressue
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::
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++ trim [moves state]
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:: +vega: learn of a kernel upgrade
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::
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++ vega [moves state]
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:: +wake: unix says wake up; process the elapsed timer and set :next-wake
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::
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++ wake
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|= error=(unit tang)
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^+ [moves state]
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:: no-op on spurious but innocuous unix wakeups
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::
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?~ timers.state
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~? ?=(^ error) %behn-wake-no-timer^u.error
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[moves state]
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:: if we errored, pop the timer and notify the client vane of the error
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::
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?^ error
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=< set-unix-wake
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(emit-vane-wake(timers.state t.timers.state) duct.i.timers.state error)
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:: if unix woke us too early, retry by resetting the unix wakeup timer
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::
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?: (gth date.i.timers.state now)
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set-unix-wake(next-wake.state ~)
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:: pop first timer, tell vane it has elapsed, and adjust next unix wakeup
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::
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=< set-unix-wake
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(emit-vane-wake(timers.state t.timers.state) duct.i.timers.state ~)
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:: +wegh: produce memory usage report for |mass
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::
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++ wegh
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^+ [moves state]
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:_ state :_ ~
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:^ duct %give %mass
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:+ %behn %|
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:~ timers+&+timers.state
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dot+&+state
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==
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:: %utilities
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::
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::+|
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::
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++ event-core .
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:: +emit-vane-wake: produce a move to wake a vane; assumes no prior moves
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::
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++ emit-vane-wake
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|= [=^duct error=(unit tang)]
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event-core(moves [duct %give %wake error]~)
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:: +emit-doze: set new unix wakeup timer in state and emit move to unix
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::
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:: We prepend the unix %doze event so that it is handled first. Arvo must
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:: handle this first because the moves %behn emits will get handled in
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:: depth-first order. If we're handling a %wake which causes a move to a
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:: different vane and a %doze event to send to unix, Arvo needs to process
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:: the %doze first because otherwise if the move to the other vane calls
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:: back into %behn and emits a second %doze, the second %doze would be
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:: handled by unix first which is incorrect.
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::
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++ emit-doze
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|= =date=(unit @da)
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^+ event-core
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:: no-op if .unix-duct has not yet been set
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::
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?~ unix-duct.state
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event-core
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:: make sure we don't try to wake up in the past
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::
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=? date-unit ?=(^ date-unit) `(max now u.date-unit)
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::
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%_ event-core
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next-wake.state date-unit
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moves [[unix-duct.state %give %doze date-unit] moves]
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==
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:: +set-unix-wake: set or unset next unix wakeup timer based on :i.timers
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::
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++ set-unix-wake
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=< [moves state]
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^+ event-core
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::
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=* next-wake next-wake.state
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=* timers timers.state
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:: if no timers, cancel existing wakeup timer or no-op
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::
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?~ timers
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?~ next-wake
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event-core
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(emit-doze ~)
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:: if :next-wake is in the past or not soon enough, reset it
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::
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?^ next-wake
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?: &((gte date.i.timers u.next-wake) (lte now u.next-wake))
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event-core
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(emit-doze `date.i.timers)
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:: there was no unix wakeup timer; set one
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::
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(emit-doze `date.i.timers)
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:: +set-timer: set a timer, maintaining the sort order of the :timers list
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::
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++ set-timer
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=* timers timers.state
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|= t=timer
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^+ timers
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::
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?~ timers
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~[t]
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:: ignore duplicates
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::
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?: =(t i.timers)
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timers
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:: timers at the same date form a fifo queue
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::
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?: (lth date.t date.i.timers)
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[t timers]
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::
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[i.timers $(timers t.timers)]
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:: +unset-timer: cancel a timer; if it already expired, no-op
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::
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++ unset-timer
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=* timers timers.state
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|= t=timer
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^+ timers
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:: if we don't have this timer, no-op
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::
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?~ timers
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~
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?: =(i.timers t)
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t.timers
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::
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[i.timers $(timers t.timers)]
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--
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--
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::
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=| behn-state
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=* state -
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|= [our=ship now=@da eny=@uvJ ski=sley]
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=* behn-gate .
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^?
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|%
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:: +call: handle a +task:able:behn request
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::
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++ call
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|= $: hen=duct
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type=*
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wrapped-task=(hobo task:able)
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==
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^- [(list move) _behn-gate]
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::
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=/ =task:able
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?. ?=(%soft -.wrapped-task)
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wrapped-task
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;;(task:able p.wrapped-task)
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::
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=/ event-core (per-event [our now hen] state)
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::
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=^ moves state
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?- -.task
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%born born:event-core
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%crud (crud:event-core [p q]:task)
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%rest (rest:event-core date=p.task)
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%drip (drip:event-core move=p.task)
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%trim trim:event-core
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%vega vega:event-core
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%wait (wait:event-core date=p.task)
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%wake (wake:event-core error=~)
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%wegh wegh:event-core
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==
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[moves behn-gate]
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:: +load: migrate an old state to a new behn version
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::
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++ load
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|= old=behn-state
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^+ behn-gate
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::
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behn-gate(state old)
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:: +scry: view timer state
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::
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:: TODO: not referentially transparent w.r.t. elapsed timers,
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:: which might or might not show up in the product
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::
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++ scry
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|= [fur=(unit (set monk)) ren=@tas why=shop syd=desk lot=coin tyl=path]
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^- (unit (unit cage))
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::
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?. ?=(%& -.why)
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~
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[~ ~ %tank !>(>timers<)]
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::
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++ stay state
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++ take
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|= [tea=wire hen=duct hin=(hypo sign)]
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^- [(list move) _behn-gate]
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?> ?=([%drip @ ~] tea)
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=/ event-core (per-event [our now hen] state)
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=^ moves state
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(take-drip:event-core (slav %ud i.t.tea) error.q.hin)
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[moves behn-gate]
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--
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