/
core.clj
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/
core.clj
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(ns aleph.http.core
(:require
[manifold.stream :as s]
[manifold.deferred :as d]
[aleph.netty :as netty]
[clojure.tools.logging :as log]
[clojure.set :as set]
[clojure.string :as str]
[byte-streams :as bs]
[potemkin :as p])
(:import
[io.netty.channel
Channel
DefaultFileRegion
ChannelFuture
ChannelFutureListener
ChannelPipeline
ChannelHandler
ChannelHandlerContext]
[io.netty.buffer
ByteBuf]
[java.nio
ByteBuffer]
[io.netty.handler.codec.http
DefaultHttpRequest DefaultLastHttpContent
DefaultHttpResponse DefaultFullHttpRequest
FullHttpRequest
HttpHeaders HttpUtil HttpContent
HttpMethod HttpRequest HttpMessage
HttpResponse HttpResponseStatus
DefaultHttpContent
HttpVersion
LastHttpContent HttpChunkedInput]
[io.netty.handler.timeout
IdleState
IdleStateEvent
IdleStateHandler]
[io.netty.handler.stream
ChunkedInput ChunkedFile ChunkedWriteHandler]
[io.netty.handler.codec.http.websocketx
WebSocketFrame
PingWebSocketFrame
TextWebSocketFrame
BinaryWebSocketFrame]
[java.io
File
RandomAccessFile
Closeable]
[java.util.concurrent
ConcurrentHashMap
ConcurrentLinkedQueue
TimeUnit]
[java.util.concurrent.atomic
AtomicBoolean]))
(def non-standard-keys
(let [ks ["Content-MD5"
"ETag"
"WWW-Authenticate"
"X-XSS-Protection"
"X-WebKit-CSP"
"X-UA-Compatible"
"X-ATT-DeviceId"
"DNT"
"P3P"
"TE"]]
(zipmap
(map str/lower-case ks)
(map #(HttpHeaders/newEntity %) ks))))
(def ^ConcurrentHashMap cached-header-keys (ConcurrentHashMap.))
(defn normalize-header-key
"Normalizes a header key to `Ab-Cd` format."
[s]
(if-let [s' (.get cached-header-keys s)]
s'
(let [s' (str/lower-case (name s))
s' (or
(non-standard-keys s')
(->> (str/split s' #"-")
(map str/capitalize)
(str/join "-")
HttpHeaders/newEntity))]
;; in practice this should never happen, so we
;; can be stupid about cache expiration
(when (< 10000 (.size cached-header-keys))
(.clear cached-header-keys))
(.put cached-header-keys s s')
s')))
(p/def-map-type HeaderMap
[^HttpHeaders headers
added
removed
mta]
(meta [_]
mta)
(with-meta [_ m]
(HeaderMap.
headers
added
removed
m))
(keys [_]
(set/difference
(set/union
(set (map str/lower-case (.names headers)))
(set (keys added)))
(set removed)))
(assoc [_ k v]
(HeaderMap.
headers
(assoc added k v)
(disj removed k)
mta))
(dissoc [_ k]
(HeaderMap.
headers
(dissoc added k)
(conj (or removed #{}) k)
mta))
(get [_ k default-value]
(if (contains? removed k)
default-value
(if-let [e (find added k)]
(val e)
(let [k' (str/lower-case (name k))
vs (.getAll headers k')]
(if (.isEmpty vs)
default-value
(if (== 1 (.size vs))
(.get vs 0)
(str/join "," vs))))))))
(defn headers->map [^HttpHeaders h]
(HeaderMap. h nil nil nil))
(defn map->headers! [^HttpHeaders h m]
(doseq [e m]
(let [k (normalize-header-key (key e))
v (val e)]
(cond
(nil? v)
(throw (IllegalArgumentException. (str "nil value for header key '" k "'")))
(sequential? v)
(.add h ^CharSequence k ^Iterable v)
:else
(.add h ^CharSequence k ^Object v)))))
(defn ring-response->netty-response [m]
(let [status (get m :status 200)
headers (get m :headers)
rsp (DefaultHttpResponse.
HttpVersion/HTTP_1_1
(HttpResponseStatus/valueOf status)
false)]
(when headers
(map->headers! (.headers rsp) headers))
rsp))
(defn ring-request->netty-request [m]
(let [headers (get m :headers)
req (DefaultHttpRequest.
HttpVersion/HTTP_1_1
(-> m (get :request-method) name str/upper-case HttpMethod/valueOf)
(str (get m :uri)
(when-let [q (get m :query-string)]
(str "?" q))))]
(when headers
(map->headers! (.headers req) headers))
req))
(defn ring-request->full-netty-request [m]
(let [headers (get m :headers)
req (DefaultFullHttpRequest.
HttpVersion/HTTP_1_1
(-> m (get :request-method) name str/upper-case HttpMethod/valueOf)
(str (get m :uri)
(when-let [q (get m :query-string)]
(str "?" q)))
(netty/to-byte-buf (:body m)))]
(when headers
(map->headers! (.headers req) headers))
req))
(p/def-derived-map NettyRequest
[^HttpRequest req
ssl?
^Channel ch
^AtomicBoolean websocket?
question-mark-index
body]
:uri (let [idx (long question-mark-index)]
(if (neg? idx)
(.getUri req)
(.substring (.getUri req) 0 idx)))
:query-string (let [uri (.uri req)]
(if (neg? question-mark-index)
nil
(.substring uri (unchecked-inc question-mark-index))))
:headers (-> req .headers headers->map)
:request-method (-> req .method .name str/lower-case keyword)
:body body
:scheme (if ssl? :https :http)
:aleph/keep-alive? (HttpUtil/isKeepAlive req)
:server-name (netty/channel-server-name ch)
:server-port (netty/channel-server-port ch)
:remote-addr (netty/channel-remote-address ch))
(p/def-derived-map NettyResponse [^HttpResponse rsp complete body]
:status (-> rsp .status .code)
:aleph/keep-alive? (HttpUtil/isKeepAlive rsp)
:headers (-> rsp .headers headers->map)
:aleph/complete complete
:body body)
(defn netty-request->ring-request [^HttpRequest req ssl? ch body]
(assoc
(->NettyRequest
req
ssl?
ch
(AtomicBoolean. false)
(-> req .uri (.indexOf (int 63))) body)
:aleph/request-arrived (System/nanoTime)))
(defn netty-response->ring-response [rsp complete body]
(->NettyResponse rsp complete body))
;;;
(defn has-content-length? [^HttpMessage msg]
(-> msg .headers (.contains "Content-Length")))
(defn try-set-content-length! [^HttpMessage msg ^long length]
(when-not (has-content-length? msg)
(HttpHeaders/setContentLength msg length)))
(def empty-last-content LastHttpContent/EMPTY_LAST_CONTENT)
(let [ary-class (class (byte-array 0))]
(defn coerce-element [x]
(if (or
(instance? String x)
(instance? ary-class x)
(instance? ByteBuffer x)
(instance? ByteBuf x))
x
(str x))))
(defn chunked-writer-enabled? [^Channel ch]
(some? (-> ch netty/channel .pipeline (.get ChunkedWriteHandler))))
(defn send-streaming-body [ch ^HttpMessage msg body]
(HttpUtil/setTransferEncodingChunked msg (boolean (not (has-content-length? msg))))
(netty/write ch msg)
(if-let [body' (if (sequential? body)
(let [buf (netty/allocate ch)
pending? (instance? clojure.lang.IPending body)]
(loop [s (map coerce-element body)]
(cond
(and pending? (not (realized? s)))
(do
(netty/write-and-flush ch buf)
s)
(empty? s)
(do
(netty/write-and-flush ch buf)
nil)
(or (not pending?) (realized? s))
(let [x (first s)]
(netty/append-to-buf! buf x)
(recur (rest s)))
:else
(do
(netty/write-and-flush ch buf)
s))))
(do
(netty/flush ch)
body))]
(let [src (if (or (sequential? body') (s/stream? body'))
(->> body'
s/->source
(s/map (fn [x]
(try
(netty/to-byte-buf x)
(catch Throwable e
(log/error e "error converting " (.getName (class x)) " to ByteBuf")
(netty/close ch))))))
(netty/to-byte-buf-stream body' 8192))
sink (netty/sink ch false #(DefaultHttpContent. %))]
(s/connect src sink)
(-> ch
netty/channel
.closeFuture
netty/wrap-future
(d/chain' (fn [_] (if (s/stream? body')
(s/close! body')
(s/close! src)))))
(let [d (d/deferred)]
(s/on-closed sink
(fn []
(when (instance? Closeable body)
(.close ^Closeable body))
(.execute (-> ch aleph.netty/channel .eventLoop)
#(d/success! d
(netty/write-and-flush ch empty-last-content)))))
d))
(netty/write-and-flush ch empty-last-content)))
(defn send-chunked-file [ch ^HttpMessage msg ^File file]
(let [raf (RandomAccessFile. file "r")
len (.length raf)
ci (HttpChunkedInput. (ChunkedFile. raf))]
(try-set-content-length! msg len)
(netty/write ch msg)
(netty/write-and-flush ch ci)))
(defn send-chunked-body [ch ^HttpMessage msg ^ChunkedInput body]
(netty/write ch msg)
(netty/write-and-flush ch body))
(defn send-file-region [ch ^HttpMessage msg ^File file]
(let [raf (RandomAccessFile. file "r")
len (.length raf)
fc (.getChannel raf)
fr (DefaultFileRegion. fc 0 len)]
(try-set-content-length! msg len)
(netty/write ch msg)
(netty/write ch fr)
(netty/write-and-flush ch empty-last-content)))
(defn send-file-body [ch ssl? ^HttpMessage msg ^File file]
(cond
ssl?
(send-streaming-body ch msg
(-> file
(bs/to-byte-buffers {:chunk-size 1e6})
s/->source))
(chunked-writer-enabled? ch)
(send-chunked-file ch msg file)
:else
(send-file-region ch msg file)))
(defn send-contiguous-body [ch ^HttpMessage msg body]
(let [omitted? (identical? :aleph/omitted body)
body (if (or (nil? body) omitted?)
empty-last-content
(DefaultLastHttpContent. (netty/to-byte-buf ch body)))
length (-> ^HttpContent body .content .readableBytes)]
(when-not omitted?
(if (instance? HttpResponse msg)
(let [code (-> ^HttpResponse msg .status .code)]
(when-not (or (<= 100 code 199) (= 204 code))
(try-set-content-length! msg length)))
(try-set-content-length! msg length)))
(netty/write ch msg)
(netty/write-and-flush ch body)))
(let [ary-class (class (byte-array 0))
;; extracted to make `send-message` more inlineable
handle-cleanup
(fn [ch f]
(-> f
(d/chain'
(fn [^ChannelFuture f]
(if f
(.addListener f ChannelFutureListener/CLOSE)
(netty/close ch))))
(d/catch' (fn [_]))))]
(defn send-message
[ch keep-alive? ssl? ^HttpMessage msg body]
(let [f (cond
(or
(nil? body)
(identical? :aleph/omitted body)
(instance? String body)
(instance? ary-class body)
(instance? ByteBuffer body)
(instance? ByteBuf body))
(send-contiguous-body ch msg body)
(instance? ChunkedInput body)
(send-chunked-body ch msg body)
(instance? File body)
(send-file-body ch ssl? msg body)
:else
(let [class-name (.getName (class body))]
(try
(send-streaming-body ch msg body)
(catch Throwable e
(log/error e "error sending body of type " class-name)))))]
(when-not keep-alive?
(handle-cleanup ch f))
f)))
(deftype WebsocketPing [deferred payload])
(defn resolve-pings! [^ConcurrentLinkedQueue pending-pings v]
(loop []
(when-let [^WebsocketPing ping (.poll pending-pings)]
(let [d' (.-deferred ping)]
(when (not (realized? d'))
(try
(d/success! d' v)
(catch Throwable e
(log/error e "error in ping callback")))))
(recur))))
(defn websocket-message-coerce-fn [^Channel ch ^ConcurrentLinkedQueue pending-pings]
(fn [msg]
(condp instance? msg
WebSocketFrame
msg
WebsocketPing
(let [^WebsocketPing msg msg
;; this check should be safe as we rely on the strictly sequential
;; processing of all messages put onto the same stream
send-ping? (.isEmpty pending-pings)]
(.offer pending-pings msg)
(when send-ping?
(if-some [payload (.-payload msg)]
(->> payload
(netty/to-byte-buf ch)
(PingWebSocketFrame.))
(PingWebSocketFrame.))))
CharSequence
(TextWebSocketFrame. (bs/to-string msg))
(BinaryWebSocketFrame. (netty/to-byte-buf ch (netty/acquire msg))))))
(defn close-on-idle-handler []
(netty/channel-handler
:user-event-triggered
([_ ctx evt]
(if (and (instance? IdleStateEvent evt)
(= IdleState/ALL_IDLE (.state ^IdleStateEvent evt)))
(netty/close ctx)
(.fireUserEventTriggered ctx evt)))))
(defn attach-idle-handlers [^ChannelPipeline pipeline idle-timeout]
(if (pos? idle-timeout)
(doto pipeline
(.addLast "idle" ^ChannelHandler (IdleStateHandler. 0 0 idle-timeout TimeUnit/MILLISECONDS))
(.addLast "idle-close" ^ChannelHandler (close-on-idle-handler)))
pipeline))
(defn websocket-ping [conn d' data]
(d/chain'
(s/put! conn (aleph.http.core.WebsocketPing. d' data))
#(when (and (false? %) (not (d/realized? d')))
;; meaning connection is already closed
(d/success! d' false)))
d')
(defn attach-heartbeats-handler [^ChannelPipeline pipeline heartbeats]
(when (and (some? heartbeats)
(pos? (:send-after-idle heartbeats)))
(let [after (:send-after-idle heartbeats)]
(.addLast pipeline
"websocket-heartbeats"
^ChannelHandler
(IdleStateHandler. 0 0 after TimeUnit/MILLISECONDS)))))
(defn handle-heartbeat [^ChannelHandlerContext ctx conn {:keys [payload
timeout]}]
(let [done (d/deferred)]
(websocket-ping conn done payload)
(when (pos? timeout)
(-> done
(d/timeout! timeout ::ping-timeout)
(d/chain'
(fn [v]
(when (and (identical? ::ping-timeout v)
(.isOpen ^Channel (.channel ctx)))
(netty/close ctx))))))))