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org.httpkit.server
as-channelclj
(as-channel ring-req
{:keys [on-receive on-ping on-close on-open init on-handshake-error]
:or {on-handshake-error
(fn [ch]
(send! ch
{:status 400
:headers {"Content-Type" "text/plain"}
:body "Bad Sec-Websocket-Key header"}
true))}})Returns `{:body ch}`, where `ch` is the request's underlying
asynchronous HTTP or WebSocket `AsyncChannel`.
Main options:
:init - (fn [ch]) for misc pre-handshake setup.
:on-receive - (fn [ch message]) called for client WebSocket messages.
:on-ping - (fn [ch data]) called for client WebSocket pings.
:on-close - (fn [ch status]) called when AsyncChannel is closed.
:on-open - (fn [ch]) called when AsyncChannel is ready for `send!`, etc.
See `Channel` protocol for more info on handlers and `AsyncChannel`s.
See `org.httpkit.timer` ns for optional timeout utils.
---
Example - Async HTTP response:
(def clients_ (atom #{}))
(defn my-async-handler [ring-req]
(as-channel ring-req
{:on-open (fn [ch] (swap! clients_ conj ch))}))
;; Somewhere else in your code
(doseq [ch @clients_]
(swap! clients_ disj ch)
(send! ch {:status 200 :headers {"Content-Type" "text/html"}
:body "Your async response"}
;; false ; Uncomment to use chunk encoding for HTTP streaming
))
Example - WebSocket response:
(defn my-chatroom-handler [ring-req]
(if-not (:websocket? ring-req)
{:status 200 :body "Welcome to the chatroom! JS client connecting..."}
(as-channel ring-req
{:on-receive (fn [ch message] (println "on-receive:" message))
:on-close (fn [ch status] (println "on-close:" status))
:on-open (fn [ch] (println "on-open:" ch))})))Channelcljprotocol
Unified asynchronous channel interface for HTTP (streaming or long-polling) and WebSocket.
closeclj
(close ch)Closes the channel. Idempotent: returns true if the channel was actually closed, or false if it was already closed.
on-closeclj
(on-close ch callback)Sets handler (fn [status]) for notification of channel being closed by the server or client. Handler will be invoked at most once. Useful for clean-up. Callback status argument: :server-close : Channel closed by sever :client-close : HTTP channel closed by client :normal : WebSocket closed by client (CLOSE_NORMAL) :going-away : WebSocket closed by client (CLOSE_GOING_AWAY) :protocol-error : WebSocket closed by client (CLOSE_PROTOCOL_ERROR) :unsupported : WebSocket closed by client (CLOSE_UNSUPPORTED) :unknown : WebSocket closed by client (unknown reason)
on-pingclj
(on-ping ch callback)Sets handler (fn [data]) for notification of client WebSocket pings. The data param represents application data and will by a byte[].
on-receiveclj
(on-receive ch callback)Sets handler (fn [message]) for notification of client WebSocket messages. Message ordering is guaranteed by server. The message argument could be a string or a byte[].
open?clj
(open? ch)Returns true iff channel is open.
send!clj
(send! ch data)(send! ch data close-after-send?)Sends data to client and returns true if the data was successfully sent,
or false if the channel is closed. Data is sent directly to the client,
NO RING MIDDLEWARE IS APPLIED.
When unspecified, `close-after-send?` defaults to true for HTTP channels
and false for WebSocket.
Data form: {:headers _ :status _ :body _} or just body. Note that :headers
and :status will be stripped for WebSocket and for HTTP streaming responses
after the first.
For WebSocket, a text frame is sent to client if data is String,
a binary frame when data is byte[] or InputStream. For for HTTP streaming
responses, data can be one of the type defined by Ring specwebsocket?clj
(websocket? ch)Returns true iff channel is a WebSocket.
IHttpServercljprotocol
-server-stop!clj
(-server-stop! http-server opts)server-portclj
(server-port http-server)Given an HttpServer, returns server's local port.
server-statusclj
(server-status http-server)Given an HttpServer, returns server's status e/o #{:stopped :running :stopping}.
run-serverclj
(run-server handler
&
[{:keys [ip port max-body max-ws max-line proxy-protocol worker-pool
error-logger warn-logger event-logger event-names
legacy-return-value? server-header address-finder
channel-factory]
:as opts
:or {ip "0.0.0.0"
port 8090
max-body 8388608
max-ws 4194304
max-line 8192
proxy-protocol :disable
legacy-return-value? true
server-header "http-kit"}}])Starts a mostly[1] Ring-compatible HttpServer with options:
:ip ; Which IP to bind (default: 0.0.0.0)
:port ; Which port to listen to for incoming requests
:worker-pool ; `java.util.concurrent.ExecutorService` or delay to use
; for handling requests. Defaults to JVM 21+ virtual threads
; if available, otherwise to an auto-sized thread pool.
; See the GitHub wiki docs for details!
:max-body ; Max HTTP body size in bytes (default: 8MB)
:max-ws ; Max WebSocket message size in bytes (default: 4MB)
:max-line ; Max HTTP header line size in bytes (default: 8KB)
:proxy-protocol ; Proxy protocol e/o #{:disable :enable :optional}
:server-header ; The "Server" header, disabled if nil. Default: "http-kit".
:error-logger ; (fn [msg ex]) -> log errors
:warn-logger ; (fn [msg ex]) -> log warnings
:event-logger ; (fn [ev-name]) -> log events
:event-names ; Map of http-kit event names to loggable event names
;; These opts may be used for Unix Domain Socket (UDS) support, see README:
:address-finder ; (fn []) -> `java.net.SocketAddress` (ip/port ignored)
:channel-factory ; (fn [java.net.SocketAddress]) -> `java.nio.channels.SocketChannel`
If :legacy-return-value? is
true (default) ; Returns a (fn stop-server [& {:keys [timeout] :or {timeout 100}}])
false (recommended) ; Returns the `HttpServer` which can be used with `server-port`,
; `server-status`, `server-stop!`, etc.
The server also supports the following JVM properties:
`org.http-kit.memmap-file-threshold`
Files above this size (in MB) are mapped into memory for efficiency when served.
Memory mapping could result to file locking. Defaults to 20 (MB).
[1] Ref. http://http-kit.org/migration.html for differences.send-checked-websocket-handshake!clj
(send-checked-websocket-handshake! ch sec-ws-accept)Given an AsyncChannel and `sec-ws-accept` string, unconditionally sends handshake to upgrade given AsyncChannel to a WebSocket. See also `websocket-handshake-check`.
send-websocket-handshake!clj
(send-websocket-handshake! ch ring-req)Returns true iff successfully upgraded a valid WebSocket request.
server-stop!clj
(server-stop! http-server)(server-stop! http-server opts)Signals given HttpServer to stop.
If already stopping: returns nil.
If not already stopping: returns a Promise that will be delivered once
server thread actually completes.
Options:
:timeout ; Max msecs to allow existing requests to complete before attempting
; interrupt (default 100).websocket-handshake-checkclj
(websocket-handshake-check ring-req)Returns `sec-ws-accept` string iff given Ring request is a valid WebSocket handshake.
with-channelcljmacrodeprecated
(with-channel ring-req ch-name & body)DEPRECATED: this macro has potential race conditions, Ref. #318. Prefer `as-channel` instead.
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