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e3a8cab943
This allows you to pass a thread directly into khan, instead of passing
a filename. This has several implications:
- The friction for using threads from an app is significantly lower.
Consider:
=/ shed
=/ m (strand ,vase)
;< ~ bind:m (poke:strandio [our %hood] %helm-hi !>('hi'))
;< ~ bind:m (poke:strandio [our %hood] %helm-hi !>('there'))
(pure:m !>('product'))
[%pass /wire %arvo %k %lard %base shed]
- These threads close over their subject, so you don't need to parse
arguments out from a vase -- you can just refer to them. The produced
value must still be a vase.
++ hi-ship
|= [=ship msg1=@t msg2=@t]
=/ shed
=/ m (strand ,vase)
;< ~ bind:m (poke:strandio [ship %hood] %helm-hi !>(msg1))
;< ~ bind:m (poke:strandio [ship %hood] %helm-hi !>(msg2))
(pure:m !>('product'))
[%pass /wire %arvo %k %lard %base shed]
- Inline threads can be added to the dojo, though this PR does not add
any sugar for this.
=strandio -build-file %/lib/strandio/hoon
=sh |= message=@t
=/ m (strand:rand ,vase)
;< ~ bind:m (poke:strandio [our %hood] %helm-hi !>('hi'))
;< ~ bind:m (poke:strandio [our %hood] %helm-hi !>(message))
(pure:m !>('product'))
|pass [%k %lard %base (sh 'the message')]
Implementation notes:
- Review the commits separately: the first is small and implements the
real feature. The second moves the strand types into lull so khan can
refer to them.
- In lull, I wanted to put +rand inside +khan, but this fails to that
issue that puts the compiler in a loop. +rand depends on +gall, which
depends on +sign-arvo, which depends on +khan. If +rand is in +khan,
this spins the compiler. The usual solution is to either move
everything into the same battery (very ugly here) or break the
recursion (which we do here).
233 lines
7.1 KiB
Plaintext
233 lines
7.1 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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++ poke-spider
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|= =cage
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^- note
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[%g %deal [our our] %spider %poke cage]
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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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(poke-spider %spider-start !>(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 (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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%lard
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=/ tid=@ta
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%^ cat 3
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'khan-lard--'
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(scot %uv (sham (mix tic eny)))
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=. tic +(tic)
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=/ =beak (get-beak bear.task now)
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=/ args [~ `tid beak shed.task]
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:_ khan-gate
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%+ turn
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:~ (watch-spider /thread-result/[tid])
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(poke-spider %spider-inline !>(args))
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==
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|=(=note ^-(move [hen %pass //g note]))
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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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?. ?=([%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] (read-wire tea)
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=/ =tube:clay (get-tube beak p.p.row mark rof)
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=/ =vase (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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