mirror of
https://github.com/ilyakooo0/urbit.git
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223 lines
6.7 KiB
Plaintext
223 lines
6.7 KiB
Plaintext
:: %khan, thread runner
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::
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:: this vane presents a command/response interface for running
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:: threads. two modes are supported: %fard for intra-arvo
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:: requests (i.e. within the same kernel space) and %fyrd for
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:: external requests (e.g. from the unix control plane.)
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::
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:: both modes take a thread start request consisting of a
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:: namespace, thread name, and input data; they respond over the
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:: same duct with either success or failure. %fard takes its
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:: input arguments as a cage and produces %arow, which contains
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:: a cage on success (or tang on failure). %fyrd takes an output
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:: mark and input page; it produces %avow, which contains a page
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:: on success.
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::
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:: threads currently expect input and produce output as vase,
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:: not cage. %fard/%arow use cage instead since this is the
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:: eventual desired thread API; however, the input mark is
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:: currently ignored, and the output mark is always %noun. (for
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:: forward compatibility, it is safe to specify %noun as the
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:: input mark.)
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::
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:: %fyrd does mark conversion on both ends, and additionally
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:: lifts its input into a $unit. this second step is done
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:: because threads conventionally take their input as a unit,
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:: with ~ for the case of "no arguments".
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::
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:: n.b. the current convention for threads is to use !< to
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:: unpack their input vase. !< imposes the requirement that the
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:: input type nests within the specified type. this limits %fyrd
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:: to threads with inputs for which a named mark exists; it is
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:: impossible to use %noun in general since it does not nest.
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:: threads written against the current vase-based API could use
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:: ;; instead of !< to unpack their input, thus allowing the
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:: use of %fyrd with %noun. however the eventual solution is
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:: probably to make threads consume and produce cages, and do
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:: mark conversion where appropriate.
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!:
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!? 164
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::
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=, khan
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|= our=ship
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=> |% :: %khan types
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+$ move [p=duct q=(wite note gift)] ::
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+$ note :: out request $->
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$~ [%g %deal *sock *term *deal:gall] ::
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$% $: %g :: to %gall
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$>(%deal task:gall) :: full transmission
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== ::
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$: %k :: to self
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$>(%fard task) :: internal thread
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== == ::
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+$ sign :: in response $<-
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$% $: %gall :: from %gall
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$>(%unto gift:gall) :: update
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== ::
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$: %khan :: from self
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$>(?(%arow %avow) gift) :: thread result
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== == ::
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+$ khan-state ::
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$: %0 :: state v0
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hey=duct :: unix duct
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tic=@ud :: tid counter
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== ::
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-- ::
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=>
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|%
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++ get-beak
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|= [=bear now=@da]
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?@(bear [our bear %da now] bear)
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::
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++ get-dais
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|= [=beak =mark rof=roof]
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^- dais:clay
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?~ ret=(rof ~ %cb beak /[mark])
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~|(mark-unknown+mark !!)
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?~ u.ret
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~|(mark-invalid+mark !!)
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?> =(%dais p.u.u.ret)
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!<(dais:clay q.u.u.ret)
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::
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++ get-tube
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|= [=beak =mark =out=mark rof=roof]
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^- tube:clay
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?~ ret=(rof ~ %cc beak /[mark]/[out-mark])
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~|(tube-unknown+[mark out-mark] !!)
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?~ u.ret
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~|(tube-invalid+[mark out-mark] !!)
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?> =(%tube p.u.u.ret)
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!<(tube:clay q.u.u.ret)
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::
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++ make-wire
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|= [=beak =mark]
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^- wire
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[%fyrd (en-beam beak mark ~)]
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::
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++ read-wire
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|= =wire
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^- (pair beak mark)
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~| khan-read-wire+wire
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?> ?=([%fyrd ^] wire)
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=/ =beam (need (de-beam t.wire))
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?>(?=([@ ~] s.beam) beam(s i.s.beam))
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::
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++ start-spider
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|= =vase
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^- note
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[%g %deal [our our] %spider %poke %spider-start vase]
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::
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++ watch-spider
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|= =path
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^- note
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[%g %deal [our our] %spider %watch path]
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--
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=| khan-state
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=* state -
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|= [now=@da eny=@uvJ rof=roof]
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=* khan-gate .
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^?
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|%
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:: +call: handle a +task request
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::
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++ call
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|= $: hen=duct
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dud=(unit goof)
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wrapped-task=(hobo task)
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==
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^- [(list move) _khan-gate]
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::
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=/ =task ((harden task) wrapped-task)
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?^ dud
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~|(%khan-call-dud (mean tang.u.dud))
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?+ -.task [~ khan-gate]
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%born
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[~ khan-gate(hey hen, tic 0)]
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::
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%fard
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=/ tid=@ta
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%^ cat 3
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'khan-fyrd--'
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(scot %uv (sham (mix tic eny)))
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=. tic +(tic)
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=* fyd p.task
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=/ =beak (get-beak bear.fyd now)
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=/ args [~ `tid beak name.fyd q.args.fyd]
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:_ khan-gate
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%+ turn
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:~ (watch-spider /thread-result/[tid])
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(start-spider !>(args))
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==
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|=(=note ^-(move [hen %pass //g note]))
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::
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%fyrd
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=* fyd p.task
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=/ =beak (get-beak bear.fyd now)
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=/ =wire (make-wire beak p.args.fyd)
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=/ =dais:clay
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(get-dais beak p.q.args.fyd rof)
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=/ =vase
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(slap (vale.dais q.q.args.fyd) !,(*hoon [~ u=.]))
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=- [[hen %pass wire -]~ khan-gate]
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[%k %fard bear.fyd name.fyd p.q.args.fyd vase]
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==
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:: +load: migrate an old state to a new khan version
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::
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++ load
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|= old=khan-state
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^+ khan-gate
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khan-gate(state old)
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:: +scry: nothing to see as yet
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::
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++ scry
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^- roon
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|= [lyc=gang car=term bem=beam]
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^- (unit (unit cage))
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~
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++ stay state
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:: +take: handle responses.
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::
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++ take
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|= [tea=wire hen=duct dud=(unit goof) hin=sign]
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^- [(list move) _khan-gate]
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?^ dud
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~|(%khan-take-dud (mean tang.u.dud))
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:_ khan-gate
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?- -.hin
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%gall
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?+ -.p.hin ~
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?(%poke-ack %watch-ack)
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?~ p.p.hin ~
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%- (slog 'khan-ack' u.p.p.hin)
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[hen %give %arow %| -.p.hin u.p.p.hin]~
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::
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%fact
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=* cag cage.p.hin
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?+ p.cag ~&(bad-fact+p.cag !!)
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%thread-fail
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=/ =tang !<(tang q.cag)
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%- (slog 'khan-fact' tang)
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[hen %give %arow %| p.cag tang]~
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::
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%thread-done
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[hen %give %arow %& %noun q.cag]~
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==
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==
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::
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%khan
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?. ?=(%arow +<.hin) ~
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?~ tea ~
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?. ?=(%fyrd -.tea) ~
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=* row p.hin
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?. ?=(%& -.row)
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[hen %give %avow row]~
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=/ [=beak =mark]
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(read-wire tea)
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=/ =tube:clay
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(get-tube beak p.p.row mark rof)
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=/ =vase
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(tube q.p.row)
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[hen %give %avow %& mark q.vase]~
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==
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--
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