-
Notifications
You must be signed in to change notification settings - Fork 241
/
server.clj
635 lines (551 loc) · 19.5 KB
/
server.clj
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
(ns aleph.http.server
(:require
[aleph.http.core :as http]
[aleph.netty :as netty]
[aleph.flow :as flow]
[byte-streams :as bs]
[clojure.tools.logging :as log]
[clojure.string :as str]
[manifold.deferred :as d]
[manifold.stream :as s])
(:import
[java.util
EnumSet
TimeZone
Date
Locale]
[java.text
DateFormat
SimpleDateFormat]
[io.aleph.dirigiste
Stats$Metric]
[aleph.http.core
NettyRequest]
[io.netty.buffer
ByteBuf]
[io.netty.channel
Channel
ChannelHandlerContext
ChannelHandler
ChannelPipeline]
[io.netty.handler.stream ChunkedWriteHandler]
[io.netty.handler.codec.http
DefaultFullHttpResponse
HttpContent HttpHeaders
HttpContentCompressor
HttpRequest HttpResponse
HttpResponseStatus DefaultHttpHeaders
HttpServerCodec HttpVersion HttpMethod
LastHttpContent HttpServerExpectContinueHandler]
[io.netty.handler.codec.http.websocketx
WebSocketServerHandshakerFactory
WebSocketServerHandshaker
PingWebSocketFrame
PongWebSocketFrame
TextWebSocketFrame
BinaryWebSocketFrame
CloseWebSocketFrame
WebSocketFrame
WebSocketFrameAggregator]
[io.netty.handler.codec.http.websocketx.extensions.compression
WebSocketServerCompressionHandler]
[java.io
IOException]
[java.net
InetSocketAddress]
[io.netty.util.concurrent
FastThreadLocal]
[java.util.concurrent
TimeUnit
Executor
ExecutorService
RejectedExecutionException]
[java.util.concurrent.atomic
AtomicReference
AtomicInteger
AtomicBoolean]))
(set! *unchecked-math* true)
;;;
(def ^FastThreadLocal date-format (FastThreadLocal.))
(def ^FastThreadLocal date-value (FastThreadLocal.))
(defn rfc-1123-date-string []
(let [^DateFormat format
(or
(.get date-format)
(let [format (SimpleDateFormat. "EEE, dd MMM yyyy HH:mm:ss z" Locale/ENGLISH)]
(.setTimeZone format (TimeZone/getTimeZone "GMT"))
(.set date-format format)
format))]
(.format format (Date.))))
(defn ^CharSequence date-header-value [^ChannelHandlerContext ctx]
(if-let [^AtomicReference ref (.get date-value)]
(.get ref)
(let [ref (AtomicReference. (HttpHeaders/newEntity (rfc-1123-date-string)))]
(.set date-value ref)
(.scheduleAtFixedRate (.executor ctx)
#(.set ref (HttpHeaders/newEntity (rfc-1123-date-string)))
1000
1000
TimeUnit/MILLISECONDS)
(.get ref))))
(defn error-response [^Throwable e]
(log/error e "error in HTTP handler")
{:status 500
:headers {"content-type" "text/plain"}
:body (let [w (java.io.StringWriter.)]
(.printStackTrace e (java.io.PrintWriter. w))
(str w))})
(let [[server-name connection-name date-name]
(map #(HttpHeaders/newEntity %) ["Server" "Connection" "Date"])
[server-value keep-alive-value close-value]
(map #(HttpHeaders/newEntity %) ["Aleph/0.4.4" "Keep-Alive" "Close"])]
(defn send-response
[^ChannelHandlerContext ctx keep-alive? ssl? rsp]
(let [[^HttpResponse rsp body]
(try
[(http/ring-response->netty-response rsp)
(get rsp :body)]
(catch Throwable e
(let [rsp (error-response e)]
[(http/ring-response->netty-response rsp)
(get rsp :body)])))]
(netty/safe-execute ctx
(doto (.headers rsp)
(.set ^CharSequence server-name server-value)
(.set ^CharSequence connection-name (if keep-alive? keep-alive-value close-value))
(.set ^CharSequence date-name (date-header-value ctx)))
(http/send-message ctx keep-alive? ssl? rsp body)))))
;;;
(defn invalid-value-response [req x]
(error-response
(IllegalArgumentException.
(str "cannot treat "
(pr-str x)
" as HTTP response for request to '"
(:uri req)
"'"))))
(defn handle-request
[^ChannelHandlerContext ctx
ssl?
handler
rejected-handler
executor
^HttpRequest req
previous-response
body
keep-alive?]
(let [^NettyRequest req' (http/netty-request->ring-request req ssl? (.channel ctx) body)
head? (identical? HttpMethod/HEAD (.method req))
rsp (if executor
;; handle request on a separate thread
(try
(d/future-with executor
(handler req'))
(catch RejectedExecutionException e
(if rejected-handler
(try
(rejected-handler req')
(catch Throwable e
(error-response e)))
{:status 503
:headers {"content-type" "text/plain"}
:body "503 Service Unavailable"})))
;; handle it inline (hope you know what you're doing)
(try
(handler req')
(catch Throwable e
(error-response e))))]
(-> previous-response
(d/chain'
netty/wrap-future
(fn [_]
(netty/release req)
(netty/release body)
(-> rsp
(d/catch' error-response)
(d/chain'
(fn [rsp]
(when (not (-> req' ^AtomicBoolean (.websocket?) .get))
(send-response ctx keep-alive? ssl?
(cond
(map? rsp)
(if head?
(assoc rsp :body :aleph/omitted)
rsp)
(nil? rsp)
{:status 204}
:else
(invalid-value-response req rsp))))))))))))
(defn exception-handler [ctx ex]
(when-not (instance? IOException ex)
(log/warn ex "error in HTTP server")))
(defn invalid-request? [^HttpRequest req]
(-> req .decoderResult .isFailure))
(defn reject-invalid-request [ctx ^HttpRequest req]
(d/chain
(netty/write-and-flush ctx
(DefaultFullHttpResponse.
HttpVersion/HTTP_1_1
HttpResponseStatus/REQUEST_URI_TOO_LONG
(-> req .decoderResult .cause .getMessage netty/to-byte-buf)))
netty/wrap-future
(fn [_] (netty/close ctx))))
(defn ring-handler
[ssl? handler rejected-handler executor buffer-capacity]
(let [buffer-capacity (long buffer-capacity)
request (atom nil)
buffer (atom [])
buffer-size (AtomicInteger. 0)
stream (atom nil)
previous-response (atom nil)
handle-request
(fn [^ChannelHandlerContext ctx req body]
(reset! previous-response
(handle-request
ctx
ssl?
handler
rejected-handler
executor
req
@previous-response
(when body (bs/to-input-stream body))
(HttpHeaders/isKeepAlive req))))
process-request
(fn [ctx req]
(if (HttpHeaders/isTransferEncodingChunked req)
(let [s (netty/buffered-source (netty/channel ctx) #(alength ^bytes %) buffer-capacity)]
(reset! stream s)
(handle-request ctx req s))
(reset! request req)))
process-last-content
(fn [ctx ^HttpContent msg]
(let [content (.content msg)]
(if-let [s @stream]
(do
(s/put! s (netty/buf->array content))
(netty/release content)
(s/close! s))
(if (and (zero? (.get buffer-size))
(zero? (.readableBytes content)))
;; there was never any body
(do
(netty/release content)
(handle-request ctx @request nil))
(let [bufs (conj @buffer content)
bytes (netty/bufs->array bufs)]
(doseq [b bufs]
(netty/release b))
(handle-request ctx @request bytes))))
(.set buffer-size 0)
(reset! stream nil)
(reset! buffer [])
(reset! request nil)))
process-content
(fn [ctx ^HttpContent msg]
(let [content (.content msg)]
(if-let [s @stream]
;; already have a stream going
(do
(netty/put! (netty/channel ctx) s (netty/buf->array content))
(netty/release content))
(let [len (.readableBytes ^ByteBuf content)]
(when-not (zero? len)
(swap! buffer conj content))
(let [size (.addAndGet buffer-size len)]
;; buffer size exceeded, flush it as a stream
(when (< buffer-capacity size)
(let [bufs @buffer
s (doto (netty/buffered-source (netty/channel ctx) #(alength ^bytes %) buffer-capacity)
(s/put! (netty/bufs->array bufs)))]
(doseq [b bufs]
(netty/release b))
(reset! buffer [])
(reset! stream s)
(handle-request ctx @request s))))))))]
(netty/channel-handler
:exception-caught
([_ ctx ex]
(exception-handler ctx ex))
:channel-inactive
([_ ctx]
(when-let [s @stream]
(s/close! s))
(doseq [b @buffer]
(netty/release b))
(.fireChannelInactive ctx))
:channel-read
([_ ctx msg]
(cond
(instance? HttpRequest msg)
(if (invalid-request? msg)
(reject-invalid-request ctx msg)
(process-request ctx msg))
(instance? HttpContent msg)
(if (instance? LastHttpContent msg)
(process-last-content ctx msg)
(process-content ctx msg))
:else
(.fireChannelRead ctx msg))))))
(defn raw-ring-handler
[ssl? handler rejected-handler executor buffer-capacity]
(let [buffer-capacity (long buffer-capacity)
stream (atom nil)
previous-response (atom nil)
handle-request
(fn [^ChannelHandlerContext ctx req body]
(reset! previous-response
(handle-request
ctx
ssl?
handler
rejected-handler
executor
req
@previous-response
body
(HttpHeaders/isKeepAlive req))))]
(netty/channel-handler
:exception-caught
([_ ctx ex]
(exception-handler ctx ex))
:channel-inactive
([_ ctx]
(when-let [s @stream]
(s/close! s))
(.fireChannelInactive ctx))
:channel-read
([_ ctx msg]
(cond
(instance? HttpRequest msg)
(if (invalid-request? msg)
(reject-invalid-request ctx msg)
(let [req msg]
(let [s (netty/buffered-source (netty/channel ctx) #(.readableBytes ^ByteBuf %) buffer-capacity)]
(reset! stream s)
(handle-request ctx req s))))
(instance? HttpContent msg)
(let [content (.content ^HttpContent msg)]
;; content might empty most probably in case of EmptyLastHttpContent
(when-not (zero? (.readableBytes content))
(netty/put! (.channel ctx) @stream content))
(when (instance? LastHttpContent msg)
(s/close! @stream)))
:else
(.fireChannelRead ctx msg))))))
(defn pipeline-builder
[handler
pipeline-transform
{:keys
[executor
rejected-handler
request-buffer-size
max-initial-line-length
max-header-size
max-chunk-size
raw-stream?
ssl?
compression?
compression-level]
:or
{request-buffer-size 16384
max-initial-line-length 8192
max-header-size 8192
max-chunk-size 16384
compression? false}}]
(fn [^ChannelPipeline pipeline]
(let [handler (if raw-stream?
(raw-ring-handler ssl? handler rejected-handler executor request-buffer-size)
(ring-handler ssl? handler rejected-handler executor request-buffer-size))]
(doto pipeline
(.addLast "http-server"
(HttpServerCodec.
max-initial-line-length
max-header-size
max-chunk-size
false))
(.addLast "continue-handler" (HttpServerExpectContinueHandler.))
(.addLast "request-handler" ^ChannelHandler handler)
(#(when (or compression? (some? compression-level))
(let [compressor (HttpContentCompressor. (or compression-level 6))]
(.addAfter ^ChannelPipeline %1 "http-server" "deflater" compressor))
(.addAfter ^ChannelPipeline %1 "deflater" "streamer" (ChunkedWriteHandler.))))
pipeline-transform))))
;;;
(defn start-server
[handler
{:keys [port
socket-address
executor
bootstrap-transform
pipeline-transform
ssl-context
shutdown-executor?
epoll?
compression?]
:or {bootstrap-transform identity
pipeline-transform identity
shutdown-executor? true
epoll? false
compression? false}
:as options}]
(let [executor (cond
(instance? Executor executor)
executor
(nil? executor)
(flow/utilization-executor 0.9 512
{:metrics (EnumSet/of Stats$Metric/UTILIZATION)
;;:onto? false
})
(= :none executor)
nil
:else
(throw
(IllegalArgumentException.
(str "invalid executor specification: " (pr-str executor)))))]
(netty/start-server
(pipeline-builder
handler
pipeline-transform
(assoc options :executor executor :ssl? (boolean ssl-context)))
ssl-context
bootstrap-transform
(when (and shutdown-executor? (instance? ExecutorService executor))
#(.shutdown ^ExecutorService executor))
(if socket-address socket-address (InetSocketAddress. port))
epoll?)))
;;;
(defn websocket-server-handler
[raw-stream?
^Channel ch
^WebSocketServerHandshaker handshaker]
(let [out (netty/sink ch false
(fn [c]
(cond
(instance? CharSequence c)
(TextWebSocketFrame. (bs/to-string c))
(instance? ByteBuf c)
(BinaryWebSocketFrame. (netty/acquire c))
:else
(BinaryWebSocketFrame. (netty/to-byte-buf ch c)))))
in (netty/buffered-source ch (constantly 1) 16)]
(s/on-drained in
;; there's a change that the connection was closed by the server,
;; in that case *out* would be closed earlier and the underlying
;; netty channel is already terminated
#(when (.isOpen ch)
(.close handshaker ch (CloseWebSocketFrame.))))
[(doto
(s/splice out in)
(reset-meta! {:aleph/channel ch}))
(netty/channel-handler
:exception-caught
([_ ctx ex]
(when-not (instance? IOException ex)
(log/warn ex "error in websocket handler"))
(s/close! out)
(.close ctx))
:channel-inactive
([_ ctx]
(s/close! out)
(s/close! in)
(.fireChannelInactive ctx))
:channel-read
([_ ctx msg]
(try
(let [ch (.channel ctx)]
(if-not (instance? WebSocketFrame msg)
(.fireChannelRead ctx msg)
(let [^WebSocketFrame msg msg]
(cond
(instance? TextWebSocketFrame msg)
(netty/put! ch in (.text ^TextWebSocketFrame msg))
(instance? BinaryWebSocketFrame msg)
(let [body (.content ^BinaryWebSocketFrame msg)]
(netty/put! ch in
(if raw-stream?
(netty/acquire body)
(netty/buf->array body))))
(instance? PingWebSocketFrame msg)
(netty/write-and-flush ch (PongWebSocketFrame. (netty/acquire (.content msg))))
(instance? CloseWebSocketFrame msg)
(.close handshaker ch (netty/acquire msg))
:else
(.fireChannelRead ctx msg)))))
(finally
(netty/release msg)))))]))
;; note, as we set `keep-alive?` to `false`, `send-message` will close the connection
;; after writes are done, which is exactly what we expect to happen
(defn send-websocket-request-expected! [ch ssl?]
(http/send-message
ch
false
ssl?
(http/ring-response->netty-response
{:status 400
:headers {"content-type" "text/plain"}})
"expected websocket request"))
(defn websocket-upgrade-request?
"Returns `true` if given request is an attempt to upgrade to websockets"
[^NettyRequest req]
(let [headers (:headers req)
conn (get headers :connection)
upgrade (get headers :upgrade)]
(and (= "upgrade" (when (some? conn) (str/lower-case conn)))
(= "websocket" (when (some? upgrade) (str/lower-case upgrade))))))
(defn initialize-websocket-handler
[^NettyRequest req
{:keys [raw-stream?
headers
max-frame-payload
max-frame-size
allow-extensions?
compression?
pipeline-transform]
:or {raw-stream? false
max-frame-payload 65536
max-frame-size 1048576
allow-extensions? false
compression? false}}]
(-> req ^AtomicBoolean (.websocket?) (.set true))
(let [^Channel ch (.ch req)
ssl? (identical? :https (:scheme req))
url (str
(if ssl? "wss://" "ws://")
(get-in req [:headers "host"])
(:uri req))
req (http/ring-request->full-netty-request req)
factory (WebSocketServerHandshakerFactory. url nil allow-extensions? max-frame-payload)]
(if-let [handshaker (.newHandshaker factory req)]
(try
(let [[s ^ChannelHandler handler] (websocket-server-handler raw-stream? ch handshaker)
p (.newPromise ch)
h (doto (DefaultHttpHeaders.) (http/map->headers! headers))]
;; actually, we're not going to except anything but websocket, so...
(doto (.pipeline ch)
(.remove "request-handler")
(.remove "continue-handler")
(.addLast "websocket-frame-aggregator" (WebSocketFrameAggregator. max-frame-size))
(#(when compression?
(.addLast ^ChannelPipeline %
"websocket-deflater"
(WebSocketServerCompressionHandler.))))
(.addLast "websocket-handler" handler))
(-> (try
(netty/wrap-future (.handshake handshaker ch ^HttpRequest req h p))
(catch Throwable e
(d/error-deferred e)))
(d/chain'
(fn [_]
(when (some? pipeline-transform)
(pipeline-transform (.pipeline ch)))
s))
(d/catch'
(fn [e]
(send-websocket-request-expected! ch ssl?)
(d/error-deferred e)))))
(catch Throwable e
(d/error-deferred e)))
(do
(WebSocketServerHandshakerFactory/sendUnsupportedVersionResponse ch)
(d/error-deferred (IllegalStateException. "unsupported version"))))))