Commit graph

11 commits

Author SHA1 Message Date
Gaël Deest
b0b02f1948 Implement HasServer (NamedRoutes routes)
We define `ServerT (NamedRoutes api) m` as `api (AsServerT m)`, so that
the server of an record-defined API is a record of handlers.

The implementation piggy backs on the instance for “vanilla” servant
types with `(:<|>)`, using the `GServantProduct` for converting backd
and forth between the record / vanilla servers.

The main difficulty is that GHC needs to know that this operation is
legit, which can be expressed as the fact that:

```
GToServant (Rep (ServerT (NamedRoutes api))) m ~
ServerT (GToServant (Rep (api AsApi))) m
```

plus a few additional constraints.

This is easy enough for `route`, as we know that `m ~ Handler`. But in
the case of `hoistServerWithContext`, the two involved monads are
unknown ; in other words, this constraint needs to hold `forall m.`

Switching `-XQuantifiedConstraints` on is not sufficient, as our
constraints involve type families (`Rep` and `ServerT`). Our trick is to
use an intermediary typeclass, `GServer`, as a provider of evidence (in
the form of a `Dict`) that our constraints are indeed satisfied for a
particular monad.

The only instance of `GServer` is defined along with it, so it is
practically invisible to users.
2021-11-18 10:09:58 +01:00
Oleg Grenrus
5f947d1c43 Bump version numbers
- Almost everything 0.15; also servant-foreign jumped to 0.15, for
  consistency
- Bump lower bounds of dependencies to most recent versions atm
- Use hspec-2.6.0
- Update `stack.yaml` accordingly
- Use base-compat a bit more
- Drop aeson-compat dependency (in tests and tutorial)
2018-11-09 20:20:26 +02:00
Arian van Putten
05379ed7e3 Replace all occurances of () with NoContent
We use NoContent to signify an empty response nowadays. This commit
replaces all occurences of () with NoContent so that all packages use
the new semantics.
2016-07-10 16:58:59 +02:00
Luke Cycon
21546991af Introduce a Handler alias for ExceptT ServantErr IO
Fixes #434
2016-04-11 22:27:29 -07:00
Julian K. Arni
f137972e5d Add 'serveWithConfig'.
And keep the old signature for 'serve'
2016-02-18 16:36:24 +01:00
Sönke Hahn
67315c4487 server: added Config machinery 2016-01-21 17:55:02 +01:00
Index Int
f2f7b061d2 Drop EitherT in favor of ExceptT 2015-09-12 15:11:24 +03:00
Julian K. Arni
6eb7add53a stylish haskell changes
And import fix.
2015-08-18 00:07:12 +02:00
Julian K. Arni
5de9daf528 Fix outdated docs 2015-05-29 10:59:24 +02:00
Brandon Martin
10a6020ca2 modify delete to allow for response body 2015-05-06 13:21:35 -06:00
Julian K. Arni
ed502f5f21 Prepare merge 2015-04-20 11:13:18 +02:00
Renamed from example/greet.hs (Browse further)