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ae8a57ca25
Instead of providing a (unit path), allows for (list path), which better supports the "update to path and subpath cases". For example, if /things wants updates about everything, and /things/specific wants updates about the specific thing, they'll both need to receive a %fact when the specific thing changes. Previously, these would have been two separate moves. Now, gall handles the multi-targeting for you.
232 lines
6.0 KiB
Plaintext
232 lines
6.0 KiB
Plaintext
:: link-proxy-hook: make local pages available to foreign ships
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::
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:: this is a "proxy" style hook, relaying foreign subscriptions into local
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:: stores if permission conditions are met.
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:: the patterns herein should one day be generalized into a proxy-hook lib.
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::
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:: this adopts a very primitive view of groups-store as containing only
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:: groups of interesting (rather than uninteresting) ships. it sets the
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:: permission condition to be that ship must be in group matching the path
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:: it's subscribing to.
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:: we check this on-watch, but also subscribe to groups so that we can kick
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:: subscriptions if needed (eg ship removed from group).
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::
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:: we deduplicate incoming subscriptions on the same path, ensuring we have
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:: exactly one local subscription per unique incoming subscription path.
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:: this comes at the cost of assuming that the store's initial response is
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:: whatever's returned by the scry at that path, but perhaps that should
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:: become part of the stores standard anyway.
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::
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/- *link, group-store
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/+ default-agent, verb
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|%
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+$ state-0
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$: %0
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::TODO we use this to detect "first sub started" and "last sub left",
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:: but can't we use [wex sup]:bowl for that?
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active=(map path (set ship))
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==
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::
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+$ card card:agent:gall
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--
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::
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=| state-0
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=* state -
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::
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%+ verb |
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^- agent:gall
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=<
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|_ =bowl:gall
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+* this .
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do ~(. +> bowl)
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def ~(. (default-agent this %&) bowl)
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::
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++ on-init
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^- (quip card _this)
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:_ this
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[watch-groups:do]~
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::
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++ on-save !>(state)
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++ on-load
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|= old=vase
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^- (quip card _this)
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[~ this(state !<(state-0 old))]
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::
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++ on-watch
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|= =path
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^- (quip card _this)
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:: the local ship should just use link-store directly
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::TODO do we want to allow this anyway, to avoid client-side target checks?
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::
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?< (team:title [our src]:bowl)
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?> (permitted:do src.bowl path)
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=^ cards state
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(start-proxy:do src.bowl path)
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[cards this]
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::
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++ on-leave
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|= =path
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^- (quip card _this)
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=^ cards state
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(stop-proxy:do src.bowl path)
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[cards this]
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::
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++ on-agent
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|= [=wire =sign:agent:gall]
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^- (quip card _this)
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?: ?=([%groups ~] wire)
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=^ cards state
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(take-groups-sign:do sign)
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[cards this]
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?: ?=([%proxy ^] wire)
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=^ cards state
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(handle-proxy-sign t.wire sign)
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[cards this]
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~| [dap.bowl %weird-wire wire]
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!!
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::
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++ on-poke on-poke:def
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++ on-peek on-peek:def
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++ on-arvo on-arvo:def
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++ on-fail on-fail:def
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--
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::
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|_ =bowl:gall
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++ permitted
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|= [who=ship =path]
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^- ?
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:: we only expose /local-pages, and only to ships in the relevant group
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::
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?. ?=([%local-pages ^] path) |
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=; group
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?& ?=(^ group)
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(~(has in u.group) who)
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==
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.^ (unit group:group-store)
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%gx
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(scot %p our.bowl)
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%group-store
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(scot %da now.bowl)
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(snoc t.path %noun)
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==
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::
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:: groups subscription
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::TODO largely copied from link-listen-hook. maybe make a store-listener lib?
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::
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++ watch-groups
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^- card
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[%pass /groups %agent [our.bowl %group-store] %watch /all]
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::
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++ take-groups-sign
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|= =sign:agent:gall
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^- (quip card _state)
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?- -.sign
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%poke-ack ~|([dap.bowl %unexpected-poke-ack /groups] !!)
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%kick [[watch-groups]~ state]
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::
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%watch-ack
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?~ p.sign [~ state]
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=/ =tank
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:- %leaf
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"{(trip dap.bowl)} failed subscribe to group store. very wrong!"
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%- (slog tank u.p.sign)
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[~ state]
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::
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%fact
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=* mark p.cage.sign
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=* vase q.cage.sign
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~& [dap.bowl %fact mark]
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?+ mark ~|([dap.bowl %unexpected-mark mark] !!)
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%group-initial [~ state]
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%group-update (handle-group-update !<(group-update:group-store vase))
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==
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==
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::
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++ handle-group-update
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|= upd=group-update:group-store
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^- (quip card _state)
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:_ state
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?. ?=(%remove -.upd) ~
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=/ whos=(list ship) ~(tap in members.upd)
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|- ^- (list card)
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?~ whos ~
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:: no need to remove to ourselves
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::
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?: =(our.bowl i.whos)
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$(whos t.whos)
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:_ $(whos t.whos)
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::NOTE this depends kind of unfortunately on the fact that we only accept
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:: subscriptions to /local-pages/* paths. it'd be more correct if we
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:: "just" looked at all paths in the map, and found the matching ones.
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(kick-proxy i.whos [%local-pages pax.upd])
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::
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:: proxy subscriptions
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::
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++ kick-proxy
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|= [who=ship =path]
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^- card
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[%give %kick ~[path] `who]
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::
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++ handle-proxy-sign
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|= [=path =sign:agent:gall]
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^- (quip card _state)
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?- -.sign
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%poke-ack ~|([dap.bowl %unexpected-poke-ack path] !!)
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%fact [[%give %fact ~[path] cage.sign]~ state]
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%kick [[(proxy-pass-link-store path %watch path)]~ state]
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::
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%watch-ack
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?~ p.sign [~ state]
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=/ =tank
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:- %leaf
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"{(trip dap.bowl)} failed subscribe to link-store. very wrong!"
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%- (slog tank u.p.sign)
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[~ state]
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==
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::
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++ proxy-pass-link-store
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|= [=path =task:agent:gall]
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^- card
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:* %pass
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[%proxy path]
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%agent
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[our.bowl %link-store]
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task
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==
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::
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++ initial-response
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|= =path
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^- card
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=/ initial=update
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[%local-pages path .^(pages %gx path)]
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[%give %fact ~ %link-update !>(initial)]
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::
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++ start-proxy
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|= [who=ship =path]
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^- (quip card _state)
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:_ state(active (~(put ju active) path who))
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:_ ~
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:: if we already have a local subscription open,
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::
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?. =(~ (~(get ju active) path))
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:: gather the initial response ourselves, and send that.
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::
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(initial-response path)
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:: else, open a local subscription,
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:: sending outward its initial response when we hear it.
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::
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(proxy-pass-link-store path %watch path)
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::
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++ stop-proxy
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|= [who=ship =path]
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^- (quip card _state)
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=. active (~(del ju active) path who)
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:_ state
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:: if there are still subscriptions remaining, do nothing.
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::
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?. =(~ (~(get ju active) path)) ~
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:: else, close the local subscription.
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::
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[(proxy-pass-link-store path %leave ~)]~
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--
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