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vervis/src/Vervis/GraphProxy.hs
fr33domlover a2468c52fd Prepare for ticket dependency federation
To be honest, this is a huge patch that changes tons of stuff and probably
should have been broken up into small changes. But I already had the codebase
not building, so... just did all of this at once :P

Basically this patch does the following:

- DB migrations for ticket dependency related tables, e.g. allowing a remote
  author and a remote child
- Allowing S2S handlers to provide an async continued processing function,
  which is executed and the result then added to the debug page
- Most UI and functionality related to ticket deps is disabled, new
  implementation being added gradually via ActivityPub
- Improvements to AP tools, e.g. allow to specify multiple hosts for approved
  forwarding when sending out an activity, and allow to specify audience of
  software-authored activities using a convenient human-friendly structure
- Implementation of S2S sharerOfferDepF which creates a dependency under a
  sharer-hosted ticket/patch and sends back an Accept
2020-06-18 10:38:04 +00:00

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1.5 KiB
Haskell

{- This file is part of Vervis.
-
- Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
-
- ♡ Copying is an act of love. Please copy, reuse and share.
-
- The author(s) have dedicated all copyright and related and neighboring
- rights to this software to the public domain worldwide. This software is
- distributed without any warranty.
-
- You should have received a copy of the CC0 Public Domain Dedication along
- with this software. If not, see
- <http://creativecommons.org/publicdomain/zero/1.0/>.
-}
-- | Persistent graphs are specified using the 'PersistEntityGraph' typeclass,
-- using value functions which specify fields. But the DB schema is known at
-- development time, and a specific graph needs to be picked statically. Since
-- the 'persistent' package doesn't have compile-time (e.g. type-level)
-- representation of the schema (but instead converts from TH directly to
-- datatypes), the graph related functions use a 'Proxy' which specifies the
-- graph using the type.
--
-- I don't know enough about type systems and advanced type features and GHC
-- extensions, to tell whether a better solution is possible. For now, this is
-- how things work.
--
-- This module is a helper for easily specifying graphs instead of typing the
-- proxy type directly each time, which may be long and cumbersome.
module Vervis.GraphProxy
( GraphProxy
--, ticketDepGraph
)
where
import Data.Proxy
import Vervis.Model
type GraphProxy n e = Proxy (n, e)
--ticketDepGraph :: GraphProxy Ticket TicketDependency
--ticketDepGraph = Proxy