moonbridge

annotate reference.txt @ 280:1a4f89f4c712

Modified behavior of moonbridge_io.signalsocket(...); Fixed usage of moonbridge_io.signalsocket(...) in moonbridge_http module
author jbe
date Tue Jun 06 21:58:26 2017 +0200 (2017-06-06)
parents d4c82c90d244
children 6bb191b6ead5
rev   line source
jbe@0 1
jbe@0 2 Moonbridge reference
jbe@0 3 ====================
jbe@0 4
jbe@0 5
jbe@0 6
jbe@52 7 Global function listen{...}
jbe@0 8 ---------------------------
jbe@0 9
jbe@0 10 This function initializes the Moonbridge Network Server. It may be called
jbe@0 11 multiple times. However, it is not allowed to register additional listeners by
jbe@234 12 calling listen{...} from a "prepare", "connect", or "finish" handler.
jbe@0 13
jbe@234 14 See file "example.lua" for parametrization of the listen{...} function.
jbe@0 15
jbe@0 16 Warning: Moonbridge will fork the Lua environment to handle parallel requests.
jbe@0 17 Functions provided as "prepare", "connect", and "finish" handlers may access
jbe@0 18 global variables, but for every child process these global variables will not
jbe@0 19 be shared! If you require a global state, a DBMS, cache server, or similar is
jbe@0 20 necessary.
jbe@0 21
jbe@0 22
jbe@0 23
jbe@50 24 Global function timeout(...)
jbe@50 25 ----------------------------
jbe@50 26
jbe@50 27 Calling this function with a positive number (time in seconds) sets a timer
jbe@50 28 that kills the current process after the selected time runs out. The remaining
jbe@50 29 time can be queried by calling this function without arguments.
jbe@50 30
jbe@50 31 Calling this function with a single argument that is the number zero will
jbe@50 32 disable the timeout.
jbe@50 33
jbe@50 34 Another mode of operation is selected by passing two arguments: a time (in
jbe@50 35 seconds) as first argument and a function as second argument. In this case, a
jbe@50 36 sub-timer will be used to limit the execution time of the function. In case of
jbe@50 37 timeout, the process will be killed (and the timeout function does not return).
jbe@50 38 If the time for the sub-timer is longer than a previously set timeout (using
jbe@50 39 the timeout(...) function with one argument), the shorter timeout (of the
jbe@50 40 previous call of timeout(...)) will have precedence.
jbe@50 41
jbe@52 42 Timers are also automatically reset (disabled) when a handler (prepare handler
jbe@52 43 or connect handler) returns. To shutdown processes after a certain time waiting
jbe@52 44 for a new request, use the idle_time parameter of the listen function.
jbe@52 45
jbe@50 46
jbe@50 47
jbe@0 48 Socket object passed to "connect" handler
jbe@0 49 -----------------------------------------
jbe@0 50
jbe@0 51 For every incoming connection, the registered "connect" handler is called with
jbe@0 52 a single socket object as argument, which is described below:
jbe@0 53
jbe@0 54
jbe@94 55 ### socket:close()
jbe@0 56
jbe@0 57 Closes the socket connection (input and output stream) by flushing all data and
jbe@94 58 sending a TCP FIN packet.
jbe@91 59
jbe@91 60 Returns true on success, or nil plus error message in case of an I/O error.
jbe@91 61 Using this method on sockets that have already been closed (or reset) will
jbe@91 62 throw an error.
jbe@0 63
jbe@0 64 Warning: Pending data on the input stream may cause connection aborts (TCP RST)
jbe@94 65 when network connections are used. All pending input data should have been read
jbe@94 66 (or drained) before calling socket:close(). Use socket:finish() to send a
jbe@94 67 TCP FIN packet to the peer before waiting for EOF from the peer.
jbe@91 68
jbe@218 69 A socket passed to the "connect" handler will be closed automatically if it was
jbe@218 70 not closed by the "connect" handler and if the "connect" handler returns
jbe@218 71 normally (i.e. without throwing an error). If the "connect" handler throws an
jbe@218 72 error, then the socket will be reset. See socket:reset().
jbe@218 73
jbe@91 74
jbe@91 75 ### socket:drain(maxlen, terminator)
jbe@0 76
jbe@91 77 Same as socket:read(maxlen, terminator), but discards the input and returns the
jbe@143 78 number of discarded bytes (as first return value) and the status code ("term",
jbe@143 79 "maxlen", "eof" as second return value).
jbe@91 80
jbe@91 81 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 82 second return value) are returned.
jbe@0 83
jbe@0 84
jbe@144 85 ### socket:drain_call(waitfunc, maxlen, terminator)
jbe@144 86
jbe@268 87 Same as socket:drain(maxlen, terminator), but calls waitfunc() (in an infinite
jbe@268 88 loop) as long as the reading is blocked.
jbe@144 89
jbe@144 90
jbe@91 91 ### socket:drain_nb(maxlen, terminator)
jbe@0 92
jbe@143 93 Same as socket:drain(maxlen, terminator), but non-blocking. The status code
jbe@143 94 (which is returned as second return value) may therefore be "term", "maxlen",
jbe@143 95 "eof", or "block".
jbe@91 96
jbe@91 97 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 98 second return value) are returned.
jbe@91 99
jbe@0 100
jbe@144 101 ### socket:drain_yield(maxlen, terminator)
jbe@144 102
jbe@144 103 Alias for socket:drain_call(coroutine.yield, maxlen, terminator)
jbe@144 104
jbe@144 105
jbe@94 106 ### socket:finish()
jbe@94 107
jbe@94 108 Sends a TCP FIN packet to indicate EOF on write stream. Subsequent reads are
jbe@94 109 still possible. When there is no more input data to be read, the connection
jbe@94 110 should finally be closed with socket:close().
jbe@94 111
jbe@94 112 In case of local sockets (Unix Domain Sockets), socket:finish() simply closes
jbe@94 113 the underlying socket and emulates EOF on subsequent reads. Also in this case,
jbe@94 114 the connection should be finally closed with socket:close().
jbe@94 115
jbe@94 116
jbe@91 117 ### socket:flush(...)
jbe@91 118
jbe@91 119 Same as socket:write(...) but additionally flushes the socket (i.e. all pending
jbe@91 120 data is passed to the operating system).
jbe@91 121
jbe@91 122 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 123 second return value) are returned. On success, the socket userdata object is
jbe@91 124 returned.
jbe@91 125
jbe@0 126
jbe@145 127 ### socket:flush_call(waitfunc, ...)
jbe@145 128
jbe@152 129 Same as socket:flush(...), but calls waitfunc() (in an infinite loop) as long
jbe@152 130 as the writing is blocked.
jbe@145 131
jbe@145 132
jbe@91 133 ### socket:flush_nb(...)
jbe@91 134
jbe@91 135 Same as socket:write_nb(...) but additionally flushes the socket (i.e. all
jbe@91 136 pending data is passed to the operating system). The total number of bytes that
jbe@91 137 could not be passed yet to the operating system is returned. Zero is returned
jbe@91 138 if all data could be flushed out.
jbe@91 139
jbe@91 140 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 141 second return value) are returned.
jbe@0 142
jbe@0 143
jbe@145 144 ### socket:flush_yield(...)
jbe@145 145
jbe@145 146 Alias for socket:flush_call(coroutine.yield, ...)
jbe@145 147
jbe@145 148
jbe@0 149 ### socket.interval
jbe@0 150
jbe@0 151 Set to the name of an interval timer if the "connect" handler was called due to
jbe@0 152 an elapsed interval timer. Otherwise nil.
jbe@0 153
jbe@0 154
jbe@0 155 ### socket.local_ip4
jbe@0 156
jbe@0 157 Local IPv4 address used for the connection. Encoded as 4 raw bytes in form of a
jbe@0 158 string.
jbe@0 159
jbe@0 160
jbe@0 161 ### socket.local_ip6
jbe@0 162
jbe@0 163 Local IPv6 address used for the connection. Encoded as 16 raw bytes in form of
jbe@0 164 a string.
jbe@0 165
jbe@0 166
jbe@0 167 ### socket.local_tcpport
jbe@0 168
jbe@0 169 Local TCP port used for the connection.
jbe@0 170
jbe@0 171
jbe@91 172 ### socket:read(maxlen, terminator)
jbe@0 173
jbe@143 174 Reads up to maxlen bytes or until an optional termination character is
jbe@91 175 encountered (which is included in the result). The maxlen value may be nil, in
jbe@91 176 which case there is no limit on the number of bytes read.
jbe@0 177
jbe@91 178 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 179 second return value) are returned.
jbe@0 180
jbe@143 181 In all other cases (including EOF), the following two values are returned:
jbe@143 182
jbe@143 183 - a string containing the bytes read (first return value, may be empty string)
jbe@143 184 - a status code equal to "term", "maxlen", or "eof" (second return value)
jbe@143 185
jbe@143 186 If an EOF is encountered before all data could be read, then "eof" is returned
jbe@143 187 as second return value. If maxlen bytes have been read and no termination
jbe@143 188 character has been read, then "maxlen" is returned as second return value. If
jbe@143 189 the termination character is the last character of the read string, the second
jbe@143 190 return value will be "term".
jbe@143 191
jbe@0 192
jbe@140 193 ### socket:read_call(waitfunc, maxlen, terminator)
jbe@140 194
jbe@152 195 Same as socket:read(maxlen, terminator), but calls waitfunc() (in an infinite
jbe@152 196 loop) as long as the reading is blocked.
jbe@140 197
jbe@140 198
jbe@91 199 ### socket:read_nb(maxlen, terminator)
jbe@91 200
jbe@143 201 Same as socket:read(maxlen, terminator), but does not block.
jbe@91 202
jbe@91 203 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 204 second return value) are returned.
jbe@78 205
jbe@143 206 In all other cases (including EOF), the following two values are returned:
jbe@143 207
jbe@143 208 - a string containing the bytes read (first return value, may be empty string)
jbe@143 209 - a status code equal to "term", "maxlen", "eof", "block" (second return value)
jbe@143 210
jbe@143 211 The status code "block" as second return value is used if the function returned
jbe@143 212 prematurely because it would block otherwise. In this case, the first return
jbe@143 213 value is a string that contains the bytes that could be read without blocking.
jbe@143 214
jbe@78 215
jbe@140 216 ### socket:read_yield(maxlen, terminator)
jbe@140 217
jbe@140 218 Alias for socket:read_call(coroutine.yield, maxlen, terminator)
jbe@140 219
jbe@140 220
jbe@0 221 ### socket.remote_ip4
jbe@0 222
jbe@0 223 Remote IPv4 address used for the connection. Encoded as 4 raw bytes in form of
jbe@0 224 a string.
jbe@0 225
jbe@0 226
jbe@0 227 ### socket.remote_ip6
jbe@0 228
jbe@0 229 Remote IPv6 address used for the connection. Encoded as 16 raw bytes in form of
jbe@0 230 a string.
jbe@0 231
jbe@0 232
jbe@0 233 ### socket.remote_tcpport
jbe@0 234
jbe@0 235 Remote TCP port used for the connection.
jbe@0 236
jbe@0 237
jbe@91 238 ### socket:reset()
jbe@91 239
jbe@218 240 Alias for socket:close(). Closes the socket connection by sending a TCP RST
jbe@218 241 packet if possible to indicate error condition. This is the default operation
jbe@218 242 when a socket handle gets garbage collected or the process is terminated
jbe@218 243 abnormally.
jbe@91 244
jbe@114 245 Returns true on success, or nil (as first return value) plus error message (as
jbe@114 246 second return value) in case of an I/O error. Using this method on sockets that
jbe@91 247 have already been closed (or reset) will throw an error.
jbe@91 248
jbe@91 249 Warning: Previously sent (and flushed) data may be lost during transmission.
jbe@91 250
jbe@91 251
jbe@0 252 ### socket:write(...)
jbe@0 253
jbe@91 254 Takes a variable number of strings and sends them to the peer. The operation is
jbe@91 255 buffered, so to actually send out the data, it is necessary to eventually call
jbe@91 256 socket:flush(), socket:finish(), or socket:close().
jbe@91 257
jbe@91 258 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 259 second return value) are returned. On success, the socket userdata object is
jbe@91 260 returned.
jbe@91 261
jbe@91 262
jbe@145 263 ### socket:write_call(waitfunc, ...)
jbe@145 264
jbe@152 265 Same as socket:write(...), but calls waitfunc() (in an infinite loop) as long
jbe@152 266 as the writing is blocked.
jbe@145 267
jbe@145 268
jbe@91 269 ### socket:write_nb(...)
jbe@91 270
jbe@91 271 Takes a variable number of strings and sends them to the peer. The operation is
jbe@91 272 buffered, so to actually send out the data, it is necessary to eventually call
jbe@91 273 socket:flush_nb(), socket:flush(), socket:finish(), or socket:close().
jbe@91 274
jbe@91 275 This function always returns immediately (i.e. it does not block). If all data
jbe@91 276 (but a small buffered portion) could be sent out, then zero is returned.
jbe@91 277 Otherwise, all arguments that could not be sent are stored in a buffer of
jbe@91 278 unlimited size (up to memory capabilities) and an integer is returned that
jbe@91 279 indicates the number of bytes currently in the buffer.
jbe@91 280
jbe@91 281 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 282 second return value) are returned.
jbe@0 283
jbe@0 284
jbe@145 285 ### socket:write_yield(...)
jbe@145 286
jbe@145 287 Alias for socket:write_call(coroutine.yield, ...)
jbe@145 288
jbe@145 289
jbe@0 290
jbe@98 291 I/O library
jbe@98 292 -----------
jbe@98 293
jbe@98 294 The Moonbridge Network Server for Lua Applications comes with its own I/O
jbe@98 295 library to support blocking as well as nonblocking I/O operations.
jbe@98 296
jbe@114 297 All methods on an I/O handle (e.g. socket) are described in the previous
jbe@114 298 section regarding the "socket" object. All other functions of the library are
jbe@114 299 listed below.
jbe@114 300
jbe@114 301
jbe@205 302 ### moonbridge_io.exec(command, arg1, arg2, ...)
jbe@205 303
jbe@205 304 Executes the given command and returns a handle with three sockets named
jbe@205 305 "stdin", "stdout", and "stderr" as well as the following methods:
jbe@205 306
jbe@205 307 - :kill(signal)
jbe@205 308 - :wait()
jbe@205 309 - :wait_nb()
jbe@205 310 - :wait_call(waitfunc)
jbe@205 311 - :wait_yield()
jbe@205 312
jbe@205 313 Use :kill(signal) to terminate the process with the given signal (defaults to
jbe@220 314 15 for SIGTERM).
jbe@205 315
jbe@205 316 The :wait() method will wait for the process to terminate and return its exit
jbe@205 317 code. If the process was terminated by a signal, a negative integer is returned
jbe@205 318 which corresponds to the respective positive signal number.
jbe@205 319
jbe@205 320 The method :wait_nb() is the same as :wait(), except that it does not block but
jbe@219 321 returns false (plus a notice as second return value) if the child process has
jbe@219 322 not terminated yet.
jbe@205 323
jbe@205 324 The method :wait_call() is the same as :wait() but calls waitfunc() (in an
jbe@205 325 infinite loop) as long as the process is still running.
jbe@205 326
jbe@205 327 The method :wait_yield() is an alias for :wait_call(coroutine.yield).
jbe@205 328
jbe@233 329 moonbridge_io.exec(...) returns nil (as first return value) plus an error
jbe@233 330 message (as second return value) in case of error.
jbe@233 331
jbe@205 332
jbe@114 333 ### moonbridge_io.localconnect(path)
jbe@114 334
jbe@114 335 Tries to connect to a local socket (also known as Unix Domain Socket). Returns
jbe@114 336 a socket object on success, or nil (as first return value) plus an error
jbe@114 337 message (as second return value) in case of error.
jbe@114 338
jbe@114 339
jbe@114 340 ### moonbridge_io.localconnect_nb(path)
jbe@114 341
jbe@114 342 Tries to connect to a local socket (also known as Unix Domain Socket). Returns
jbe@114 343 a socket object on success, or nil (as first return value) plus an error
jbe@114 344 message (as second return value) in case of error.
jbe@114 345
jbe@114 346 Same as moonbridge_io.localconnect(path), except that this function does not
jbe@114 347 block and immediately returns a socket object.
jbe@114 348
jbe@114 349 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 350 second return value) may be returned. However, connection errors may also be
jbe@114 351 reported on first read or write on the socket.
jbe@114 352
jbe@114 353
jbe@114 354 ### moonbridge_io.locallisten(path)
jbe@114 355
jbe@114 356 Attempts to create a local socket (also known as Unix Domain Socket) to accept
jbe@118 357 incoming connections. If the file does already exist and is a socket, then it
jbe@118 358 is deleted automatically before being re-created.
jbe@114 359
jbe@114 360 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@220 361 second return value) may be returned. On success, a listener object is returned
jbe@114 362 which supports the methods :accept(), :accept_nb(), and :close().
jbe@114 363
jbe@220 364 The method :accept() blocks until a new incoming connection is available, in
jbe@114 365 which case a socket object is returned.
jbe@114 366
jbe@114 367 The method :accept_nb() works like :accept(), except that the call is
jbe@114 368 nonblocking and returns false (plus a notice as second return value) in case no
jbe@114 369 incoming connection is available. It is possible to wait for an incoming
jbe@114 370 connection by including the listener object in the input_set of the
jbe@114 371 moonbridge_io.poll(...) call.
jbe@114 372
jbe@114 373 The method :close() will close the listening socket. In case of local sockets
jbe@114 374 (Unix Domain Sockets), the socket will not be unlinked in the file system.
jbe@114 375
jbe@114 376 I/O errors by the methods of the listener object are also reported by returning
jbe@114 377 nil (as first return value) plus an error message (as second return value).
jbe@114 378
jbe@98 379
jbe@106 380 ### moonbridge_io.poll(input_set, output_set, timeout)
jbe@106 381
jbe@106 382 This function waits for at least one of the given file descriptors and/or
jbe@106 383 I/O handles to be ready for input or output. The two sets of file descriptors
jbe@106 384 and/or handles must contain the file descriptor or handle as a key, and a value
jbe@220 385 which does evaluate to true, e.g. input_set = {[socketA] = true}. If a set is
jbe@220 386 nil, it is treated as being empty.
jbe@106 387
jbe@106 388 Returns true when at least one file descriptor or handle is ready for reading
jbe@266 389 or writing respectively, or if a signal has been received during waiting.
jbe@266 390 Returns false (plus a notice as second return value) in case of timeout.
jbe@266 391
jbe@266 392
jbe@270 393 ### moonbridge_io.signals
jbe@270 394
jbe@270 395 A table mapping a string (e.g. "TERM" or "KILL") to the corresponding signal
jbe@270 396 number (e.g. 9 or 15, respectively).
jbe@270 397
jbe@270 398
jbe@278 399 ### moonbridge_io.signalsocket(signal)
jbe@278 400
jbe@278 401 This function installs a signal handler. As argument, either the signal number
jbe@280 402 is passed (e.g. 15) or a name (e.g. "TERM"). The function returns a socket
jbe@280 403 object that receives a character (".") each time a signal is received.
jbe@266 404
jbe@280 405 The function can be called multiple times, in which case the same socket object
jbe@280 406 is returned. The returned socket should never be closed by the caller.
jbe@278 407
jbe@280 408 The process should not be forked after calling this function (except for
jbe@280 409 replacing the process with another program).
jbe@106 410
jbe@106 411
jbe@98 412 ### moonbridge_io.tcpconnect(hostname, port)
jbe@98 413
jbe@98 414 Tries to open a TCP connection with the given host and TCP port number. Returns
jbe@114 415 a socket object on success, or nil (as first return value) plus an error
jbe@114 416 message (as second return value) in case of error.
jbe@98 417
jbe@98 418
jbe@99 419 ### moonbridge_io.tcpconnect_nb(hostname, port)
jbe@99 420
jbe@99 421 Same as moonbridge_io.tcpconnect(hostname, port), except that this function
jbe@99 422 does not block and immediately returns a socket object.
jbe@99 423
jbe@102 424 Note: The current implementation still blocks during the DNS lookup. Use a
jbe@102 425 numeric IP address as hostname to be truly nonblocking.
jbe@102 426
jbe@99 427 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 428 second return value) may be returned. However, connection errors may also be
jbe@99 429 reported on first read or write on the socket.
jbe@99 430
jbe@99 431
jbe@114 432 ### moonbridge_io.tcplisten(hostname, port)
jbe@114 433
jbe@114 434 Attempts to open a TCP port for listening. To listen on the loopback interface,
jbe@114 435 use "::1" as hostname if IPv6 shall be used, or use "127.0.0.1" as hostname if
jbe@114 436 IPv4 shall be used. To listen on all available interfaces, use "::" (IPv6) or
jbe@114 437 "0.0.0.0" (IPv4) respectively.
jbe@114 438
jbe@114 439 In case of an I/O error, nil (as first return value) plus an error message (as
jbe@114 440 second return value) may be returned. On success, a listener object is returned
jbe@114 441 which supports the methods :accept(), :accept_nb(), and :close(). See reference
jbe@114 442 for moonbridge.io_locallisten(...).
jbe@114 443
jbe@114 444
jbe@235 445 ### moonbridge_io.timeref(previous)
jbe@235 446
jbe@235 447 Helper function which returns a time reference (in SI-seconds). If a value is
jbe@235 448 passed as an optional argument to the function, then that value is substracted
jbe@235 449 from the result. A common idiom is:
jbe@235 450
jbe@235 451 local starttime = moonbridge_io.timeref()
jbe@235 452 [...]
jbe@235 453 while true do
jbe@235 454 [...]
jbe@235 455 if not moonbridge_io.poll(
jbe@235 456 input_set,
jbe@235 457 output_set,
jbe@235 458 timeout - moonbridge_io.timeref(starttime)
jbe@235 459 ) then
jbe@273 460 error("Timeout")
jbe@235 461 end
jbe@235 462 [...]
jbe@235 463 end
jbe@235 464
jbe@235 465
jbe@98 466
jbe@0 467 HTTP module
jbe@0 468 -----------
jbe@0 469
jbe@220 470 The HTTP module exports the function moonbridge_http.generate_handler(callback)
jbe@224 471 that converts an HTTP handler to a "connect" handler. See file "helloworld.lua"
jbe@224 472 for a simple example or "example_application.lua" for a more complex example of
jbe@224 473 invocation. A table with options may be passed either as a second argument, or
jbe@224 474 as a first argument preceeding the callback function (whichever is more
jbe@224 475 convenient).
jbe@0 476
jbe@0 477 The following options are supported:
jbe@0 478
jbe@0 479 - request_body_size_limit: maximum size of payload of HTTP request body
jbe@0 480 (transfer encoding is allowed to add a limited amount of extra data)
jbe@0 481 - chunk_size: optional default value for maximum_input_chunk_size and
jbe@0 482 minimum_output_chunk_size
jbe@0 483 - request_header_size_limit: maximum size of HTTP request headers
jbe@0 484 - maximum_input_chunk_size: maximum chunk size when streaming a request body or
jbe@0 485 certain POST fields (bigger chunks will be fragmented automatically)
jbe@0 486 - minimum_output_chunk_size: minimum size for a chunk when sending a response
jbe@0 487 body (smaller chunks will be buffered and concatenated with future data;
jbe@0 488 ignored when request:flush() is called)
jbe@0 489 - static_headers: a set of headers to be included in every HTTP response
jbe@0 490 (may be a string, a table or strings, or a table of key-value pairs)
jbe@0 491
jbe@0 492 The callback function receives a single request object as argument, which is
jbe@0 493 described below.
jbe@0 494
jbe@0 495
jbe@0 496 ### request.body
jbe@0 497
jbe@0 498 The request body (without headers) as a string. Accessing this value makes
jbe@0 499 further access to request.post_params and request.post_params_list, or
jbe@0 500 invocation of request:stream_request_body(...) impossible.
jbe@0 501
jbe@0 502
jbe@60 503 ### request:close_after_finish()
jbe@60 504
jbe@60 505 Closes the connection after answering the request.
jbe@60 506
jbe@60 507 This method can only be called before the HTTP response header section has been
jbe@60 508 finished (i.e. before request:finish_headers(), request:send_data(...), or
jbe@60 509 request:finish() were called), but it may be called before a status code has
jbe@60 510 been sent using request:send_status(...).
jbe@60 511
jbe@60 512 A corresponding "Connection: close" header is automatically sent.
jbe@60 513
jbe@184 514 See also request:monologue().
jbe@184 515
jbe@184 516
jbe@184 517 ### request:consume_input()
jbe@184 518
jbe@184 519 Starts processing the request body (if existent) to set the values
jbe@184 520 request.post_params, request.post_params_list, request.post_metadata, and
jbe@184 521 and request.post_metadata_list and/or to call POST field stream handlers that
jbe@184 522 have been previously registered with request:stream_post_param(...) or
jbe@184 523 request:stream_post_params(...), or to call a previously registered request
jbe@184 524 body stream handler that was set with request:set_request_body_streamer().
jbe@184 525
jbe@184 526 This method gets invoked automatically when the POST param tables
jbe@184 527 (request.post_params, etc.) are accessed or if request.body is accessed.
jbe@184 528
jbe@60 529
jbe@0 530 ### request.cookies
jbe@0 531
jbe@0 532 A table with all cookies sent by the client.
jbe@0 533
jbe@0 534
jbe@50 535 ### request.faulty
jbe@50 536
jbe@184 537 Normally set to false. In case of a write error on the client connection or
jbe@184 538 certain other unexpected errors, this value is set to true before a Lua error
jbe@184 539 is raised.
jbe@50 540
jbe@50 541 A faulty request handle must not be used, or another Lua error will be raised.
jbe@50 542
jbe@50 543
jbe@0 544 ### request:finish()
jbe@0 545
jbe@224 546 Finishes and flushes a HTTP response. An HTTP status, all headers, and the
jbe@224 547 response body (if applicable) must have been previously sent. May be called
jbe@224 548 multiple times (performs no operation if called on a finished request handle).
jbe@224 549 Gets automatically invoked when the callback handler returns. After calling
jbe@224 550 this method explicitly, no further data may be written.
jbe@0 551
jbe@0 552
jbe@0 553 ### request:finish_headers()
jbe@0 554
jbe@0 555 Finishes and flushes the HTTP response header section. May be called multiple
jbe@0 556 times, as long as the request is not finished completely. This method is
jbe@0 557 automatically invoked if the application is beginning to send a response body.
jbe@0 558 After calling this method, no further headers may be sent.
jbe@0 559
jbe@0 560
jbe@0 561 ### request:flush()
jbe@0 562
jbe@0 563 Flushes any pending output data. Note: In order to mark the end of a response
jbe@0 564 body, it is required to call request:finish().
jbe@0 565
jbe@0 566
jbe@184 567 ### request.fresh
jbe@184 568
jbe@184 569 Set to false whenever the request object has been used (e.g. data has been read
jbe@184 570 or sent out, or a stream handler was installed); true otherwise.
jbe@184 571
jbe@184 572
jbe@0 573 ### request.get_params
jbe@0 574
jbe@0 575 A table that maps field names to their corresponding GET value. If there are
jbe@0 576 several GET values with the given field name, then the first value is used.
jbe@0 577
jbe@35 578 Note: May be implemented through metamethods, but does support iteration
jbe@35 579 through pairs(...).
jbe@35 580
jbe@0 581
jbe@0 582 ### request.get_params_list
jbe@0 583
jbe@0 584 A table that maps field names to a sequence of their corresponding GET values.
jbe@0 585
jbe@35 586 Note: May be implemented through metamethods, but does support iteration
jbe@35 587 through pairs(...).
jbe@35 588
jbe@0 589
jbe@0 590 ### request.headers
jbe@0 591
jbe@0 592 A table that maps (case-insensitively) a HTTP header field name to a sequence
jbe@224 593 of values. For each occurrence of the respective header line, a string entry is
jbe@224 594 created in that sequence. Non-existent headers are mapped to an empty table.
jbe@0 595
jbe@0 596
jbe@0 597 ### request.headers_csv_string
jbe@0 598
jbe@0 599 A table that maps (case-insensitively) a HTTP header field name to a comma
jbe@0 600 separated string. Multiple occurrences of the header with the given field name
jbe@0 601 are automatically merged into the comma separated string.
jbe@0 602
jbe@0 603
jbe@0 604 ### request.headers_csv_table
jbe@0 605
jbe@0 606 A table that maps (case-insensitively) a HTTP header field name to a sequence
jbe@224 607 of values. One entry is created in that sequence for every comma separated
jbe@224 608 value of each header with the given field name.
jbe@0 609
jbe@0 610
jbe@0 611 ### request.headers_flags
jbe@0 612
jbe@0 613 A table that maps (case-insensitively) a HTTP header field name to another
jbe@0 614 table which (again case-insensitively) maps a string to a boolean, depending on
jbe@0 615 whether this string occurred in the list of comma separated values of one
jbe@0 616 header line with the given field name that was the key in the first table.
jbe@0 617
jbe@0 618
jbe@0 619 ### request.headers_value
jbe@0 620
jbe@0 621 A table that maps (case-insensitively) a HTTP header field name to a value. If
jbe@0 622 multiple header lines with the given field name have been received, false is
jbe@0 623 used as value.
jbe@0 624
jbe@0 625
jbe@0 626 ### request.method
jbe@0 627
jbe@0 628 The HTTP request method, e.g. "HEAD", "GET", or "POST".
jbe@0 629
jbe@0 630
jbe@184 631 ### request:monologue()
jbe@184 632
jbe@184 633 Same as request:close_after_finish() but additionally discards all input data
jbe@184 634 immediately.
jbe@184 635
jbe@184 636
jbe@0 637 ### request.path
jbe@0 638
jbe@10 639 The requested path without a leading slash and without the query part (e.g.
jbe@10 640 "index.html" if "/index.html?a=b&c=d" has been requested). For the query part,
jbe@10 641 see request.query.
jbe@10 642
jbe@10 643 This value will be nil if (and only if) the request method is "OPTIONS" with a
jbe@10 644 request target equal to "*" (see also asterisk-form of request-target in
jbe@10 645 section 5.3.4 in RFC 7230).
jbe@0 646
jbe@0 647
jbe@0 648 ### request.post_metadata
jbe@0 649
jbe@0 650 Only set for multipart/form-data POST requests. A table that maps field names
jbe@0 651 to their corresponding POST metadata table which contains two entries:
jbe@0 652 "file_name" and "content_type". If there are several POST values with the given
jbe@0 653 field name, then the first value/file is used.
jbe@0 654
jbe@224 655 Note: May be implemented through metamethods, but does support iteration
jbe@224 656 through pairs(...).
jbe@224 657
jbe@0 658
jbe@0 659 ### request.post_metadata_list
jbe@0 660
jbe@0 661 Only set for multipart/form-data POST requests. A table that maps field names
jbe@0 662 to a sequence with their corresponding POST metadata tables. Needed if multiple
jbe@0 663 files are uploaded with the same field name.
jbe@0 664
jbe@224 665 Note: May be implemented through metamethods, but does support iteration
jbe@224 666 through pairs(...).
jbe@224 667
jbe@0 668
jbe@0 669 ### request.post_params
jbe@0 670
jbe@0 671 A table that maps field names to their corresponding POST value. If there are
jbe@0 672 several POST values with the given field name, then the first value is used.
jbe@0 673
jbe@35 674 Note: May be implemented through metamethods, but does support iteration
jbe@35 675 through pairs(...).
jbe@35 676
jbe@0 677
jbe@0 678 ### request.post_params_list
jbe@0 679
jbe@0 680 A table that maps field names to a sequence of their corresponding POST values.
jbe@0 681
jbe@35 682 Note: May be implemented through metamethods, but does support iteration
jbe@35 683 through pairs(...).
jbe@35 684
jbe@0 685
jbe@0 686 ### request.query
jbe@0 687
jbe@12 688 Query part of the request target including the leading question mark, e.g.
jbe@12 689 "?a=b&c=d" if the requested target is "/index.html?a=b&c=d". The data is
jbe@10 690 automatically parsed and made available through request.get_params and
jbe@10 691 request.get_params_list.
jbe@10 692
jbe@10 693 If there is no query part given in the request target, then this string is
jbe@10 694 the empty string. This value will be nil if (and only if) the request method
jbe@10 695 is "OPTIONS" with a request target equal to "*" (see also asterisk-form of
jbe@10 696 request-target in section 5.3.4 in RFC 7230).
jbe@0 697
jbe@0 698
jbe@0 699 ### request:send_data(...)
jbe@0 700
jbe@0 701 Sends data as response body. All arguments are converted via tostring(...) and
jbe@0 702 concatenated. May be called multiple times until the request has been finished
jbe@0 703 by calling request:finish().
jbe@0 704
jbe@0 705 If the request method (see request.method) is "HEAD", then calls to
jbe@0 706 request:send_data(...) are automatically ignored.
jbe@0 707
jbe@0 708
jbe@0 709 ### request:send_header(key, value)
jbe@0 710
jbe@0 711 Sends a HTTP response header that consists of the given key and the given
jbe@0 712 value. Note: Key and value must be provided as separate arguments. Before any
jbe@0 713 headers can be sent, a HTTP status must have been set with
jbe@0 714 request:send_status(status_string).
jbe@0 715
jbe@0 716
jbe@0 717 ### request:send_status(status_string)
jbe@0 718
jbe@0 719 Sends a HTTP response status that is given as a string consisting of a 3-digit
jbe@0 720 number and an explanatory string, e.g. "200 OK" or "404 Not Found". This
jbe@0 721 function must be called once before any headers or response body data may be
jbe@0 722 sent.
jbe@0 723
jbe@0 724
jbe@0 725 ### request.socket
jbe@0 726
jbe@0 727 The underlaying socket. Can be used to force a TCP RST, etc.
jbe@0 728
jbe@0 729
jbe@0 730 ### request:stream_post_param(field_name, callback)
jbe@0 731
jbe@0 732 Registers a stream handler for the given POST parameter. The callback function
jbe@0 733 will be called in the following manner:
jbe@0 734
jbe@0 735 - For the initial chunk, the first chunk gets passed as first argument while a
jbe@0 736 table with metadata ("field_name" and "content_type") gets passed as second
jbe@0 737 argument. In case of an immediate EOF (i.e. an empty file), the passed
jbe@0 738 chunk is the empty string. In all other cases the chunk has a length greater
jbe@0 739 than zero.
jbe@0 740 - For any remaining chunks, the respective chunk gets passed as first and only
jbe@0 741 argument (no metadata). Here, the chunk has always a length greater than
jbe@0 742 zero.
jbe@0 743 - To indicate the end of the stream, the callback function is called without
jbe@0 744 arguments. This also happens in case of an immediate EOF (see above).
jbe@0 745
jbe@0 746 In case of an immediate EOF (i.e. an empty file), the callback function is thus
jbe@0 747 called as follows:
jbe@0 748
jbe@0 749 - The first time with an empty string as first argument, and with the metadata
jbe@0 750 as second argument.
jbe@0 751 - The second time without any arguments.
jbe@0 752
jbe@184 753 Note that request:consume_input() needs to be called to enforce streaming to
jbe@184 754 finish.
jbe@184 755
jbe@0 756
jbe@0 757 ### request:stream_post_params(pattern, callback)
jbe@0 758
jbe@0 759 Same as request:stream_post_param(...) but providing a string pattern to match
jbe@0 760 multiple field names (e.g. "^file_[0-9]+$").
jbe@0 761
jbe@0 762
jbe@0 763 ### request:stream_request_body(callback)
jbe@0 764
jbe@184 765 Registeres a stream handler for the whole request body. For each chunk of the
jbe@184 766 request body, the callback function is called with the corresponding chunk. End
jbe@184 767 of data is indicated by passing a nil value to the callback functuion.
jbe@0 768
jbe@184 769 Note that request:consume_input() needs to be called to enforce streaming to
jbe@184 770 finish.
jbe@0 771
jbe@44 772
jbe@184 773 ### request:stream_request_body_now(callback)
jbe@184 774
jbe@184 775 Start streaming of request body immediately. On EOF the function returns and
jbe@184 776 the callback function is *not* called with nil as argument.
jbe@184 777
jbe@184 778

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