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Merge pull request #3243 from urbit/lf/lib-hooks-docs
lib-hooks: document with comments
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@ -1,3 +1,23 @@
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:: lib/pull-hook: helper for creating a push hook
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::
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:: lib/pull-hook is a helper for automatically pulling data from a
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:: corresponding push-hook to a store.
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::
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:: ## Interfacing notes:
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::
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:: The inner door may interact with the library by producing cards.
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:: Do not pass any cards on a wire beginning with /helper as these
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:: wires are reserved by this library. Any watches/pokes/peeks not
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:: listed below will be routed to the inner door.
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::
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:: ## Subscription paths
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::
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:: /tracking: The set of resources we are pulling
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::
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:: ## Pokes
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::
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:: %pull-hook-action: Add/remove a resource from pulling.
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::
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/- *pull-hook
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/+ default-agent, resource
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::
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@ -5,12 +25,24 @@
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|%
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+$ card card:agent:gall
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::
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:: $config: configuration for the pull hook
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::
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:: .store-name: name of the store to send subscription updates to.
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:: .update-mark: mark that updates will be tagged with
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:: .push-hook-name: name of the corresponding push-hook
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::
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+$ config
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$: store-name=term
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update=mold
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update-mark=term
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push-hook-name=term
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==
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::
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:: $state-0: state for the pull hook
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::
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:: .tracking: a map of resources we are pulling, and the ships that
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:: we are pulling them from.
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:: .inner-state: state given to internal door
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::
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+$ state-0
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$: %0
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@ -37,7 +69,29 @@
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|* config
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$_ ^|
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|_ bowl:gall
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:: +on-pull-nack: handle failed pull subscription
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::
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:: This arm is called when a pull subscription fails. lib/pull-hook
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:: will automatically delete the resource from .tracking by the
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:: time this arm is called.
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::
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++ on-pull-nack
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|~ [resource tang]
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*[(list card) _^|(..on-init)]
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:: +on-pull-kick: produce any additional resubscribe path
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::
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:: If non-null, the produced path is appended to the original
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:: subscription path. This should be used to encode extra
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:: information onto the path in order to reduce the payload of a
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:: kick and resubscribe.
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::
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:: If null, a resubscribe is not attempted
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::
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++ on-pull-kick
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|~ resource
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*(unit path)
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::
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:: from agent:gall
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++ on-init
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*[(list card) _^|(..on-init)]
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::
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@ -75,26 +129,6 @@
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++ on-fail
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|~ [term tang]
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*[(list card) _^|(..on-init)]
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:: +on-pull-nack: handle failed pull subscription
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::
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:: This arm is called when a pull subscription fails.
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::
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++ on-pull-nack
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|~ [resource tang]
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*[(list card) _^|(..on-init)]
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:: +on-pull-kick: produce any additional resubscribe path
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::
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:: If non-null, the produced path is appended to the original
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:: subscription path. This should be used to encode extra
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:: information onto the path in order to reduce the payload of a
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:: kick and resubscribe.
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::
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:: If null, a resubscribe is not attempted
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::
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++ on-pull-kick
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|~ resource
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*(unit path)
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:: ::
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--
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++ agent
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|* =config
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@ -209,7 +243,10 @@
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=^ cards pull-hook
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(on-fail:og term tang)
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[cards this]
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++ on-peek on-peek:def
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++ on-peek
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|= =path
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^- (unit (unit cage))
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(on-peek:og path)
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--
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|_ =bowl:gall
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+* og ~(. pull-hook bowl)
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@ -1,8 +1,41 @@
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:: lib/push-hook: helper for creating a push hook
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::
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:: lib/push-hook is a helper for automatically pushing data from a
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:: local store to the corresponding pull-hook on remote ships. It also
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:: proxies remote pokes to the store.
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::
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:: ## Interfacing notes:
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::
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:: The inner door may interact with the library by producing cards.
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:: Do not pass any cards on a wire beginning with /helper as these
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:: wires are reserved by this library. Any watches/pokes/peeks not
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:: listed below will be routed to the inner door.
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::
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:: ## Subscription paths
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::
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:: /resource/[resource]: Receive initial state and updates to
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:: .resource. .resource should be encoded with en-path:resource from
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:: /lib/resource. Facts on this path will be of mark
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:: update-mark.config
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::
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:: ## Pokes
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::
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:: %push-hook-action: Add/remove a resource from pushing.
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:: [update-mark.config]: A poke to proxy to the local store
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::
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/- *push-hook
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/+ default-agent, resource
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|%
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+$ card card:agent:gall
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::
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:: $config: configuration for the push hook
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::
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:: .store-name: name of the store to proxy pokes and
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:: subscriptions to
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:: .store-path: subscription path to receive updates on
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:: .update-mark: mark that updates will be tagged with
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:: .pull-hook-name: name of the corresponding pull-hook
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::
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+$ config
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$: store-name=term
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store-path=path
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@ -10,6 +43,12 @@
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update-mark=term
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pull-hook-name=term
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==
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::
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:: $state-0: state for the push hook
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::
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:: .sharing: resources that the push hook is proxying
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:: .inner-state: state given to internal door
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::
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+$ state-0
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$: %0
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sharing=(set resource)
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@ -21,6 +60,48 @@
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$_ ^|
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|_ bowl:gall
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::
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:: +resource-for-update: get affected resource from an update
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::
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:: Given a vase of the update, the mark of which is
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:: update-mark.config, produce the affected resource, if any.
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::
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++ resource-for-update
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|~ vase
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*(unit resource)
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::
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:: +take-update: handle update from store
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::
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:: Given an update from the store, do other things after proxying
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:: the update
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::
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++ take-update
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|~ vase
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*[(list card) _^|(..on-init)]
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:: +should-proxy-update: should forward update to store
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::
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:: If %.y is produced, then the update is forwarded to the local
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:: store. If %.n is produced then the update is not forwarded and
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:: the poke fails.
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::
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++ should-proxy-update
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|~ vase
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*?
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:: +initial-watch: produce initial state for a subscription
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::
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:: .resource is the resource being subscribed to.
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:: .path is any additional information in the subscription wire.
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:: This would typically be used to encode state that the subscriber
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:: already has. For example, a chat client might encode
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:: the number of messages that it already has, or the date it last
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:: received an update.
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::
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:: If +initial-watch crashes, the subscription fails.
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::
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++ initial-watch
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|~ [path resource]
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*vase
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:: from agent:gall
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::
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++ on-init
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*[(list card) _^|(..on-init)]
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::
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@ -58,35 +139,6 @@
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++ on-fail
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|~ [term tang]
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*[(list card) _^|(..on-init)]
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:: +resource-for-update: get affected resource from an update
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++ resource-for-update
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|~ vase
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*(unit resource)
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::
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:: +on-update: handle update from store
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::
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:: Do extra stuff on store update
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++ take-update
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|~ vase
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*[(list card) _^|(..on-init)]
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:: +should-proxy-update: should forward update to store
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::
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:: If %.y is produced, then the update is forwarded to the local
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:: store. If %.n is produced then the update is not forwarded and
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:: the poke fails.
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::
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++ should-proxy-update
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|~ vase
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*?
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:: +initial-watch: produce initial state for a subscription
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::
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:: .resource is the resource being subscribed to.
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:: .path is any additional information in the subscription wire
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::
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++ initial-watch
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|~ [path resource]
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*vase
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::
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--
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++ agent
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|* =config
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