urbit/pkg/arvo/lib/pull-hook.hoon

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:: lib/pull-hook: helper for creating a push hook
::
:: lib/pull-hook is a helper for automatically pulling data from a
:: corresponding push-hook to a store.
::
:: ## Interfacing notes:
::
:: The inner door may interact with the library by producing cards.
:: Do not pass any cards on a wire beginning with /helper as these
:: wires are reserved by this library. Any watches/pokes/peeks not
:: listed below will be routed to the inner door.
::
:: ## Subscription paths
::
:: /tracking: The set of resources we are pulling
::
:: ## Pokes
::
:: %pull-hook-action: Add/remove a resource from pulling.
::
/- *pull-hook
/+ default-agent, resource
::
::
|%
+$ card card:agent:gall
::
:: $config: configuration for the pull hook
::
:: .store-name: name of the store to send subscription updates to.
:: .update-mark: mark that updates will be tagged with
:: .push-hook-name: name of the corresponding push-hook
::
+$ config
$: store-name=term
update=mold
update-mark=term
push-hook-name=term
==
::
:: $base-state-0: state for the pull hook
::
:: .tracking: a map of resources we are pulling, and the ships that
:: we are pulling them from.
:: .inner-state: state given to internal door
::
+$ base-state-0
$: tracking=(map resource ship)
inner-state=vase
==
::
+$ base-state-1
$: base-state-0
failed-kicks=(map resource ship)
==
::
+$ state-0 [%0 base-state-0]
::
+$ state-1 [%1 base-state-0]
::
+$ state-2 [%2 base-state-1]
::
+$ versioned-state
$% state-0
state-1
state-2
==
::
++ default
|* [pull-hook=* =config]
|_ =bowl:gall
::
++ on-pull-nack
|= [=resource =tang]
=/ =tank leaf+"subscribe failed from {<dap.bowl>} for {<resource>}"
%- (slog tank tang)
[~ pull-hook]
::
++ on-pull-kick
|= =resource
*(unit path)
--
::
++ pull-hook
|* config
$_ ^|
|_ bowl:gall
:: +on-pull-nack: handle failed pull subscription
::
:: This arm is called when a pull subscription fails. lib/pull-hook
:: will automatically delete the resource from .tracking by the
:: time this arm is called.
::
++ on-pull-nack
|~ [resource tang]
*[(list card) _^|(..on-init)]
:: +on-pull-kick: produce any additional resubscribe path
::
:: If non-null, the produced path is appended to the original
:: subscription path. This should be used to encode extra
:: information onto the path in order to reduce the payload of a
:: kick and resubscribe.
::
:: If null, a resubscribe is not attempted
::
++ on-pull-kick
|~ resource
*(unit path)
::
:: from agent:gall
++ on-init
*[(list card) _^|(..on-init)]
::
++ on-save
*vase
::
++ on-load
|~ vase
*[(list card) _^|(..on-init)]
::
++ on-poke
|~ [mark vase]
*[(list card) _^|(..on-init)]
::
++ on-watch
|~ path
*[(list card) _^|(..on-init)]
::
++ on-leave
|~ path
*[(list card) _^|(..on-init)]
::
++ on-peek
|~ path
*(unit (unit cage))
::
++ on-agent
|~ [wire sign:agent:gall]
*[(list card) _^|(..on-init)]
::
++ on-arvo
|~ [wire sign-arvo]
*[(list card) _^|(..on-init)]
::
++ on-fail
|~ [term tang]
*[(list card) _^|(..on-init)]
--
++ agent
|* =config
|= =(pull-hook config)
=| state-2
=* state -
^- agent:gall
=<
|_ =bowl:gall
+* this .
og ~(. pull-hook bowl)
hc ~(. +> bowl)
def ~(. (default-agent this %|) bowl)
::
++ on-init
^- [(list card:agent:gall) agent:gall]
=^ cards pull-hook
on-init:og
[cards this]
::
++ on-load
|= =old=vase
=/ old
!<(versioned-state old-vase)
=| cards=(list card:agent:gall)
|^
?- -.old
%2
=^ og-cards pull-hook
(on-load:og inner-state.old)
=. state old
=^ retry-cards state
retry-failed-kicks
:_ this
:(weld cards og-cards retry-cards)
::
%1 $(old [%2 +.old ~])
::
%0
%_ $
-.old %1
::
cards
(weld cards (missing-subscriptions tracking.old))
==
==
::
++ retry-failed-kicks
=| acc-cards=(list card)
=/ failures=(list [rid=resource =ship])
~(tap by failed-kicks)
=. tracking
(~(uni by tracking) failed-kicks)
=. failed-kicks ~
|- ^- (quip card _state)
?~ failures
[acc-cards state]
=, failures
=^ crds state
(handle-kick:hc i)
$(failures t, acc-cards (weld acc-cards crds))
::
++ missing-subscriptions
|= tracking=(map resource ship)
^- (list card:agent:gall)
%+ murn
~(tap by tracking)
|= [rid=resource =ship]
^- (unit card:agent:gall)
=/ =path
resource+(en-path:resource rid)
=/ =wire
(make-wire pull+path)
?: (~(has by wex.bowl) [wire ship push-hook-name.config])
~
`[%pass wire %agent [ship push-hook-name.config] %watch path]
--
::
++ on-save
^- vase
=. inner-state
on-save:og
!>(state)
::
++ on-poke
|= [=mark =vase]
^- [(list card:agent:gall) agent:gall]
?> (team:title our.bowl src.bowl)
?+ mark
=^ cards pull-hook
(on-poke:og mark vase)
[cards this]
::
%sane
=^ cards state
poke-sane:hc
[cards this]
::
%pull-hook-action
=^ cards state
(poke-hook-action:hc !<(action vase))
[cards this]
==
::
++ on-watch
|= =path
^- [(list card:agent:gall) agent:gall]
?> (team:title our.bowl src.bowl)
?. ?=([%tracking ~] path)
=^ cards pull-hook
(on-watch:og path)
[cards this]
:_ this
~[give-update]
::
++ on-agent
|= [=wire =sign:agent:gall]
^- [(list card:agent:gall) agent:gall]
?. ?=([%helper %pull-hook @ *] wire)
=^ cards pull-hook
(on-agent:og wire sign)
[cards this]
?. ?=([%pull %resource *] t.t.wire)
(on-agent:def wire sign)
=/ rid=resource
(de-path:resource t.t.t.t.wire)
?+ -.sign (on-agent:def wire sign)
%kick
=^ cards state
(handle-kick:hc rid src.bowl)
[cards this]
::
%watch-ack
?~ p.sign
[~ this]
=. tracking
(~(del by tracking) rid)
=^ cards pull-hook
(on-pull-nack:og rid u.p.sign)
:_ this
[give-update cards]
::
%fact
?. =(update-mark.config p.cage.sign)
=^ cards pull-hook
(on-agent:og wire sign)
[cards this]
:_ this
~[(update-store:hc rid q.cage.sign)]
==
++ on-leave
|= =path
^- [(list card:agent:gall) agent:gall]
=^ cards pull-hook
(on-leave:og path)
[cards this]
::
++ on-arvo
|= [=wire =sign-arvo]
^- [(list card:agent:gall) agent:gall]
=^ cards pull-hook
(on-arvo:og wire sign-arvo)
[cards this]
++ on-fail
|= [=term =tang]
^- [(list card:agent:gall) agent:gall]
=^ cards pull-hook
(on-fail:og term tang)
[cards this]
++ on-peek
|= =path
^- (unit (unit cage))
?. =(/x/tracking path)
(on-peek:og path)
``noun+!>(~(key by tracking))
--
|_ =bowl:gall
+* og ~(. pull-hook bowl)
++ poke-sane
^- (quip card:agent:gall _state)
=/ cards
restart-subscriptions
~? > ?=(^ cards)
"Fixed subscriptions in {<dap.bowl>}"
:_ state
restart-subscriptions
::
++ check-subscription
|= [rid=resource =ship]
^- ?
%+ lien
~(tap in ~(key by wex.bowl))
|= [=wire her=^ship app=term]
^- ?
?& =(app push-hook-name.config)
=(ship her)
=((scag 4 wire) /helper/pull-hook/pull/resource)
=(`rid (de-path-soft:resource (slag 4 wire)))
==
::
++ restart-subscriptions
^- (list card:agent:gall)
%- zing
%+ turn
~(tap by tracking)
|= [rid=resource =ship]
^- (list card:agent:gall)
?: (check-subscription rid ship) ~
~& >> "restarting: {<rid>}"
=/ pax=(unit path)
(on-pull-kick:og rid)
?~ pax ~
(watch-resource rid u.pax)
::
++ mule-scry
|= [ref=* raw=*]
=/ pax=(unit path)
((soft path) raw)
?~ pax ~
?. ?=([@ @ @ @ *] u.pax) ~
=/ ship
(slaw %p i.t.u.pax)
=/ ved
(slay i.t.t.t.u.pax)
=/ dat
?~ ved now.bowl
=/ cas=(unit case)
((soft case) p.u.ved)
?~ cas now.bowl
?: ?=(%da -.u.cas)
p.u.cas
now.bowl
:: catch bad gall scries early
?: ?& =((end 3 i.u.pax) %g)
?| !=(`our.bowl ship)
!=(dat now.bowl)
==
==
~
``.^(* u.pax)
::
++ handle-kick
|= [rid=resource =ship]
^- (quip card _state)
=/ res=toon
(mock [|.((on-pull-kick:og rid)) %9 2 %0 1] mule-scry)
=/ pax=(unit path)
!< (unit path)
:- -:!>(*(unit path))
?:(?=(%0 -.res) p.res ~)
=? failed-kicks !?=(%0 -.res)
=/ =tang
:+ leaf+"failed kick handler, please report"
leaf+"{<rid>} in {(trip dap.bowl)}"
?: ?=(%2 -.res)
p.res
?> ?=(%1 -.res)
=/ maybe-path=(unit path) ((soft path) p.res)
?~ maybe-path ~
[(smyt u.maybe-path) ~]
%- (slog tang)
(~(put by failed-kicks) rid ship)
?^ pax
:_ state
(watch-resource rid u.pax)
=. tracking
(~(del by tracking) rid)
:_ state
~[give-update]
::
++ poke-hook-action
|= =action
^- [(list card:agent:gall) _state]
|^
?- -.action
%add (add +.action)
%remove (remove +.action)
==
++ add
|= [=ship =resource]
~| resource
?< |(=(our.bowl ship) =(our.bowl entity.resource))
?: (~(has by tracking) resource)
[~ state]
=. tracking
(~(put by tracking) resource ship)
:_ state
(watch-resource resource /)
::
++ remove
|= =resource
:- (leave-resource resource)
state(tracking (~(del by tracking) resource))
--
::
++ leave-resource
|= rid=resource
^- (list card)
=/ ship=(unit ship)
(~(get by tracking) rid)
?~ ship ~
=/ =wire
(make-wire pull+resource+(en-path:resource rid))
[%pass wire %agent [u.ship push-hook-name.config] %leave ~]~
::
++ watch-resource
|= [rid=resource pax=path]
^- (list card)
=/ ship=(unit ship)
(~(get by tracking) rid)
?~ ship ~
=/ =path
(welp resource+(en-path:resource rid) pax)
=/ =wire
(make-wire pull+resource+(en-path:resource rid))
[%pass wire %agent [u.ship push-hook-name.config] %watch path]~
::
++ make-wire
|= =wire
^+ wire
%+ weld
/helper/pull-hook
wire
::
++ get-conversion
.^ tube:clay
%cc (scot %p our.bowl) %home (scot %da now.bowl)
/[update-mark.config]/resource
==
::
++ give-update
^- card
[%give %fact ~[/tracking] %pull-hook-update !>(tracking)]
::
++ update-store
|= [wire-rid=resource =vase]
^- card
=/ =wire
(make-wire /store)
=+ !<(rid=resource (get-conversion vase))
?> =(src.bowl (~(got by tracking) rid))
?> =(wire-rid rid)
[%pass wire %agent [our.bowl store-name.config] %poke update-mark.config vase]
--
--