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172 lines
5.4 KiB
Plaintext
172 lines
5.4 KiB
Plaintext
:: This is a library for writing API connectors.
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::
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:: The basic flow is as follows:
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:: -- define a list of `++place`s, which specify the exported
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:: interface.
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:: -- in `++peer-scry` in the connector app, call `++read` in
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:: this library to match to the appropriate place and
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:: produce a move (usually either an immediate response or
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:: an http request to the api).
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:: -- in `++sigh-httr` in the connector app, call `++sigh` in
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:: this library to handle the response according to the
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:: place.
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/+ old-zuse
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=, old-zuse
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::
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|* {move/mold sub-result/mold}
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=> |%
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:: A place consists of:
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:: -- `guard`, the type of the paths we should match. For
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:: example, to match `/issues/<user>/<repo>` use
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:: `{$issues @t @t $~}`.
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:: -- `read-x`, called when someone tries to read the
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:: place with care `%x`. Should produce a single move,
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:: usually either a `%diff` response if we can
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:: immediately answer or a `%hiss` http request if we
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:: need to make a request to the api. See the
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:: `++read-*` functions in `++helpers` for some common
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:: handlers.
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:: -- `read-y`, same as `read-x` except with care `%y`.
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:: -- `sigh-x`, called when an http response comes back on
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:: this place. You're given the json of the result, and
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:: you should produce either a result or null. Null
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:: represents an error. If you didn't create an http
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:: request in `read-x`, then this should never be
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:: called. Use `++sigh-strange` from `++helpers` to
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:: unconditionally signal an error.
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:: -- `sigh-y`, same as `sigh-x` except with care `%y`.
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:: Note that a `%y` request must produce an arch, unlike
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:: a `%x` request, which may produce data of any mark.
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::
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++ place
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$: guard/mold
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read-x/$-(path move)
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read-y/$-(path move)
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sigh-x/$-(jon/json (unit sub-result))
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sigh-y/$-(jon/json (unit arch))
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==
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--
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|%
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:: Generic helpers for place definitions
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::
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++ helpers
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|= {ost/bone wir/wire api-url/tape}
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|%
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:: Produce null. Used as `++read-x` in places which are pure
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:: directories. `++sigh-x` should be `++sigh-strange`.
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::
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++ read-null |=(pax/path [ost %diff %null ~])
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::
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:: Produce an arch with the given list of children. Used as
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:: `++read-y` in places which have a static list of (known)
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:: children rather than having to ask the api. `++sigh-y`
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:: should be `++sigh-strange`.
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::
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++ read-static
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|= children/(list @t)
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|= pax/path
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[ost %diff %arch ~ (malt (turn children |=(@t [+< ~])))]
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::
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:: Produce an api request to the given path. Use this if the
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:: endpoint is static. If the endpoint depends on parameters
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:: in the path, use `++get`. For example:
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:: `|=(pax/path (get /users/[+<.pax]/repos))`.
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::
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++ read-get
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|= endpoint/path
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|= pax/path
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(get endpoint)
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::
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:: Make an api request to the specified endpoint.
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::
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++ get
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|= endpoint/path
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^- move
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:* ost %hiss wir `~ %httr %hiss
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(endpoint-to-purl endpoint) %get ~ ~
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==
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::
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:: Convert an endpoint path to a purl.
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::
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++ endpoint-to-purl
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|= endpoint/path
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(scan (weld api-url <`path`endpoint>) auri:urlp)
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::
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:: Return error. Used when no http response is expected.
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::
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++ sigh-strange |=(jon/json ~)
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--
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::
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:: Handles one-time requests by mapping them to their handling,
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:: either `read-x` or `read-y`, in `places`.
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::
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++ read
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|= {ost/bone places/(list place) ren/care pax/path}
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^- move
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?~ places
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~& [%strange-path pax]
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(move [ost %diff ?+(ren !! $x null+~, $y arch+*arch)])
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=+ match=((soft guard.i.places) pax)
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?~ match
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$(places t.places)
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(?+(ren !! $x read-x.i.places, $y read-y.i.places) pax)
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::
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:: Handles http responses sent in `++read` by mapping them to
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:: their handling, either `sigh-x` or `sigh-y`, in `places`.
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::
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++ sigh
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=, html
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=, eyre
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|= {places/(list place) ren/care pax/path res/httr}
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^- sub-result
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=< ?+(ren ~|([%invalid-care ren] !!) $x sigh-x, $y sigh-y)
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|%
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++ sigh-x
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?~ r.res
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~& [err+%empty-response code+p.res]
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null+~
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=+ jon=(rush q.u.r.res apex:de-json)
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?~ jon
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~& [err+%bad-json code+p.res body+q.u.r.res]
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null+~
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?. =(2 (div p.res 100))
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~& [err+%request-rejected code+p.res msg+u.jon]
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null+~
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|- ^- sub-result
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?~ places
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~&([%sigh-strange-path pax] (sub-result null+~))
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=+ match=((soft guard.i.places) pax)
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?~ match
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$(places t.places)
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=+ (sigh-x.i.places u.jon)
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?~ -
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~& [err+s+%response-not-valid pax+pax code+(jone p.res) msg+u.jon]
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(sub-result null+~)
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u.-
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::
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++ sigh-y
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?~ r.res
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~& [err+s+%empty-response code+(jone p.res)]
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arch+*arch
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=+ jon=(rush q.u.r.res apex:de-json)
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?~ jon
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~& [err+s+%bad-json code+(jone p.res) body+s+q.u.r.res]
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arch+*arch
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?. =(2 (div p.res 100))
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~& [err+s+%request-rejected code+(jone p.res) msg+u.jon]
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arch+*arch
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%- sub-result
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|- ^- {$arch arch}
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?~ places
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~&([%sigh-strange-path pax] arch+*arch)
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=+ match=((soft guard.i.places) pax)
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?~ match
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$(places t.places)
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=+ (sigh-y.i.places u.jon)
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?~ -
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~& [err+s+%response-not-valid pax+pax code+(jone p.res) msg+u.jon]
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arch+*arch
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arch+u.-
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--
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--
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