140 lines
5.4 KiB
Markdown
140 lines
5.4 KiB
Markdown
# Differences to HTTPure
|
|
|
|
HTTPurple 🪁 is a fork of [HTTPure](https://github.com/citizennet/purescript-httpure) that I started to freely experiment with some ideas I have on improving the usage experience. Currently I have no intentions on back-porting any of it to HTTPure, as I don't have the time for it and also don't want to restrict myself.
|
|
|
|
If you have used HTTPure before, you'll probably want to go through the following changes to get started using HTTPurple 🪁:
|
|
* [routing-duplex](#routing-duplex)
|
|
* [Extensible requests and node middlewares](#extensible-requests-and-node-middlewares)
|
|
* [startup options](#startup-options)
|
|
* [request parsing and validation](#request-parsing-and-validation)
|
|
* [other improvements](#other-improvmenets)
|
|
|
|
## Routing-duplex
|
|
|
|
The most notable difference to HTTPure is that HTTPurple 🪁 uses the amazing [`routing-duplex`](https://github.com/natefaubion/purescript-routing-duplex) library for routing. I found the previous lookup-based routing tedious to work with, especially when having more complex routes, and quite error-prone, especially if you need reverse-routing for redirects.
|
|
|
|
[`routing-duplex`](https://github.com/natefaubion/purescript-routing-duplex) offers an elegant bidirectional routing which was initially designed for SPAs. Have a look at the really extensive [`documentation`](https://github.com/natefaubion/purescript-routing-duplex). The benefits of using routing-duplex are
|
|
* Much simpler and less tedious definition of routes
|
|
* Roundtrip printing/parsing of routes, so no more invalid redirects
|
|
* Exhaustive pattern matching so you are sure to match all defined routes
|
|
* Option to separate routes into logical groups
|
|
|
|
Here is a bit more elaborated examples:
|
|
|
|
```purescript
|
|
module Main where
|
|
|
|
import Prelude hiding ((/))
|
|
|
|
import Data.Either (Either(..))
|
|
import Data.Generic.Rep (class Generic)
|
|
import Data.Maybe (Maybe(..))
|
|
import Data.Tuple (Tuple(..))
|
|
import HTTPurple
|
|
|
|
data Route
|
|
= Home
|
|
| Profile String
|
|
| Account String
|
|
| Search { q :: String, sorting :: Maybe Sort }
|
|
derive instance Generic Route _
|
|
|
|
data Sort = Asc | Desc
|
|
derive instance Generic Sort _
|
|
|
|
sortToString :: Sort -> String
|
|
sortToString = case _ of
|
|
Asc -> "asc"
|
|
Desc -> "desc"
|
|
|
|
sortFromString :: String -> Either String Sort
|
|
sortFromString = case _ of
|
|
"asc" -> Right Asc
|
|
"desc" -> Right Desc
|
|
val -> Left $ "Not a sort: " <> val
|
|
|
|
sort :: RouteDuplex' String -> RouteDuplex' Sort
|
|
sort = as sortToString sortFromString
|
|
|
|
api :: RouteDuplex' Route
|
|
api = mkRoute
|
|
{ "Home": noArgs
|
|
, "Profile": "profile" / string segment
|
|
, "Account": "account" / string segment
|
|
, "Search": "search" ? { q: string, sorting: optional <<< sort }
|
|
}
|
|
|
|
main :: ServerM
|
|
main = serve { port: 8080 } { route: api, router: apiRouter }
|
|
where
|
|
|
|
apiRouter { route: Home } = ok "hello world!"
|
|
apiRouter { route: Profile profile } = ok $ "hello " <> profile <> "!"
|
|
apiRouter { route: Account account } = found' redirect ""
|
|
where
|
|
reverseRoute = print api $ Profile account
|
|
redirect = headers { "Location": reverseRoute }
|
|
apiRouter { route: Search { q, sorting } } = ok $ "searching for query " <> q <> " " <> case sorting of
|
|
Just Asc -> "ascending"
|
|
Just Desc -> "descending"
|
|
Nothing -> "defaulting to ascending"
|
|
```
|
|
|
|
## Extensible requests and node middlewares
|
|
|
|
In HTTPurple 🪁 requests are extensible records, so you can add data to the request. This is particularly useful when implementing middlewares that e.g. add user information to the incoming requets.
|
|
|
|
Furthermore, HTTPurple 🪁 adds support for (application-level) node/express middlewares.
|
|
|
|
See [`Middleware.md`](./Middleware.md) for more information.
|
|
|
|
|
|
## Startup options
|
|
|
|
HTTPurple 🪁 greatly simplifies the startup options and functions. The `serve`, `serve'`, `serveSecure` and `serveSecure'` have been merged into a single function `serve` that accepts listen options as the first parameter and uses sane defaults if you don't provide any.
|
|
|
|
The easiest way to start a server is to provide just the route and a router:
|
|
|
|
```purescript
|
|
main :: ServerM
|
|
main =
|
|
serve {} { route, router }
|
|
```
|
|
|
|
This will spin up the http server with sane defaults.
|
|
```bash
|
|
HTTPurple 🪁 up and running on http://0.0.0.0:8080
|
|
```
|
|
|
|
But you can overwrite any of the optional properties like this
|
|
|
|
```purescript
|
|
main :: ServerM
|
|
main =
|
|
serve {
|
|
hostname: "localhost"
|
|
, port: 9000
|
|
, certFile: "./Certificate.cer"
|
|
, keyFile: "./Key.key"
|
|
, notFoundHandler
|
|
, onStarted: log "Server started 🚀"
|
|
, closingHandler: NoClosingHandler
|
|
} { route, router }
|
|
where
|
|
notFoundHandler :: Request Unit -> ResponseM
|
|
notFoundHandler = const $ ok "Nothing to see here"
|
|
```
|
|
|
|
## Request parsing and validation
|
|
|
|
HTTPurple 🪁 has some helpers to make json parsing and validation very simple. See the [requests guide](./Requests.md) for more information.
|
|
|
|
## Headers
|
|
|
|
HTTPurple 🪁 has two separate types for headers, namely `RequestHeader` and `ResponseHeader`. `ResponseHeader` wraps `Map CaseInsensitiveString (Array String)` and therefore allows setting multiple response headers. This is useful if you e.g. want to set multiple `Set-Cookie` headers.
|
|
Also you can create the headers by passing a record. See the [responses documentation](./Responses.md) for more information.
|
|
|
|
## Other improvements
|
|
|
|
* Default closing handler - A default closing handler is provided so you can just stop your server using `ctrl+x` without having to worry about anything. You can deactivate it by setting `closingHandler: NoClosingHandler` in the listen options.
|