summaryrefslogtreecommitdiff
path: root/src/main.mlton.sml
blob: a6eaa7ea52126bc37e624e192bfb8ddb00031b71 (plain)
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
(* Copyright (c) 2008-2012, Adam Chlipala
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - The names of contributors may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *)

val socket = ".urweb_daemon"

exception Code of OS.Process.status

datatype flag_arity =
      ZERO of (unit -> unit)
    | ONE  of string * (string -> unit)
    | TWO  of string * string * (string * string -> unit)

fun parse_flags flag_info args =
    let
        fun search_pred flag0 =
            (* Remove preceding "-". *)
            let val flag0 = String.extract (flag0, 1, NONE)
            in
                fn (flag1, _, _) => flag0 = flag1
            end

        fun normalizeArg arg =
          case arg of
              "-h" => "-help"
            | "--h" => "-help"
            | "--help" => "-help"
            | _ => arg

        fun loop [] : string list = []
          | loop (arg :: args) =
            let
                val arg = normalizeArg arg
            in
                if String.isPrefix "-" arg then
                    case List.find (search_pred arg) flag_info of
                        NONE => raise Fail ("Unknown flag "^arg^", see -help")
                      | SOME x => exec x args
                else
                    arg :: loop args
            end

        and exec (_, ZERO f, _) args =
                (f (); loop args)
          | exec (_, ONE (_, f), _) (x :: args) =
                (f x; loop args)
          | exec (_, TWO (_, _, f), _) (x :: y :: args) =
                (f (x, y); loop args)
          | exec (flag, ONE _, _) [] =
                raise Fail ("Flag "^flag^" is missing an argument, see -help")
          | exec (flag, TWO _, _) [] =
                raise Fail ("Flag "^flag^" is missing two arguments, see -help")
          | exec (flag, TWO _, _) [_] =
                raise Fail ("Flag "^flag^" is missing an argument, see -help")
    in
        loop args
    end

fun usage flag_info =
    let
        val name = CommandLine.name ()

        fun print_desc NONE = print "\n"
          | print_desc (SOME s) = (print " : "; print s; print "\n")

        fun print_args (ZERO _) = ()
          | print_args (ONE (x, _)) = print (" " ^ x)
          | print_args (TWO (x, y, _)) = print (" " ^ x ^ " " ^ y)

        fun print_flag (flag, args, desc) =
            (print ("  -" ^ flag);
             print_args args;
             print_desc desc)
    in
        print "usage: \n";
        print ("  " ^ name ^ " daemon [stop|start]\n");
        print ("  " ^ name ^ " [flag ...] project-name\n");
        print "Supported flags are:\n";
        app print_flag flag_info;
        raise Code OS.Process.success
    end



(* Encapsulate main invocation handler in a function, possibly to be called multiple times within a daemon. *)

exception DaemonExit

fun oneRun args =
    let
        val timing = ref false
        val tc = ref false
        val demo = ref (NONE : (string * bool) option)
        val tutorial = ref false
        val css = ref false

        val () = (Compiler.debug := false;
                  Elaborate.verbose := false;
                  Elaborate.dumpTypes := false;
                  Elaborate.dumpTypesOnError := false;
                  Elaborate.unifyMore := false;
                  Compiler.dumpSource := false;
                  Compiler.doIflow := false;
                  Demo.noEmacs := false;
                  Settings.setDebug false)

        val () = Compiler.beforeC := MLton.GC.pack

        fun print_and_exit msg () =
            (print msg; print "\n";
             raise Code OS.Process.success)

        val printVersion = print_and_exit Config.versionString
        val printNumericVersion = print_and_exit Config.versionNumber
        fun printCCompiler () = print_and_exit (Settings.getCCompiler ()) ()
        val printCInclude = print_and_exit Config.includ

        fun printModuleOf fname =
            print_and_exit (Compiler.moduleOf fname) ()

        fun add_class (class, num) =
            case Int.fromString num of
                 NONE => raise Fail ("Invalid limit number '" ^ num ^ "'")
               | SOME n =>
                 if n < 0 then
                     raise Fail ("Invalid limit number '" ^ num ^ "'")
                 else
                     Settings.addLimit (class, n)

        fun set_true flag = ZERO (fn () => flag := true)
        fun call_true f = ZERO (fn () => f true)

        (* This is a function, and not simply a value, because it
         * is recursive in the help-flag. *)
        fun flag_info () = [
              ("help", ZERO (fn () => usage (flag_info ())),
                    SOME "print this overview"),
              ("version", ZERO printVersion,
                    SOME "print version number and exit"),
              ("numeric-version", ZERO printNumericVersion,
                    SOME "print numeric version number and exit"),
              ("css", set_true css,
                    SOME "print categories of CSS properties"),
              ("print-ccompiler", ZERO printCCompiler,
                    SOME "print C compiler and exit"),
              ("print-cinclude", ZERO printCInclude,
                    SOME "print directory of C headers and exit"),
              ("ccompiler", ONE ("<program>", Settings.setCCompiler),
                    SOME "set the C compiler to <program>"),
              ("demo", ONE ("<prefix>", fn prefix =>
                                demo := SOME (prefix, false)),
                    NONE),
              ("guided-demo", ONE ("<prefix>", fn prefix =>
                                demo := SOME (prefix, true)),
                    NONE),
              ("tutorial", set_true tutorial,
                    SOME "render HTML tutorials from .ur source files"),
              ("protocol", ONE ("[http|cgi|fastcgi|static]",
                                Settings.setProtocol),
                    SOME "set server protocol"),
              ("prefix", ONE ("<prefix>", Settings.setUrlPrefix),
                    SOME "set prefix used before all URI's"),
              ("db", ONE ("<string>", Settings.setDbstring o SOME),
                    SOME "database connection information"),
              ("dbms", ONE ("[sqlite|mysql|postgres]", Settings.setDbms),
                    SOME "select database engine"),
              ("debug", call_true Settings.setDebug,
                    SOME "save some intermediate C files"),
              ("verbose", ZERO (fn () =>
                                (Compiler.debug := true;
                                 Elaborate.verbose := true)),
                    NONE),
              ("timing", set_true timing,
                    SOME "time compilation phases"),
              ("tc", set_true tc,
                    SOME "stop after type checking"),
              ("dumpTypes", set_true Elaborate.dumpTypes,
                    SOME "print kinds and types"),
              ("dumpTypesOnError", set_true Elaborate.dumpTypesOnError,
                    SOME "print kinds and types if there is an error"),
              ("unifyMore", set_true Elaborate.unifyMore,
                    SOME "continue unification before reporting type error"),
              ("dumpSource", set_true Compiler.dumpSource,
                    SOME ("print source code of last intermediate program "^
                          "if there is an error")),
              ("dumpVerboseSource", ZERO (fn () =>
                                (Compiler.dumpSource := true;
                                 ElabPrint.debug := true;
                                 ExplPrint.debug := true;
                                 CorePrint.debug := true;
                                 MonoPrint.debug := true)),
                    NONE),
              ("output", ONE ("<file>", Settings.setExe o SOME),
                    SOME "output executable as <file>"),
              ("js", ONE ("<file>", Settings.setOutputJsFile o SOME),
                    SOME "serve JavaScript as <file>"),
              ("sql", ONE ("<file>", Settings.setSql o SOME),
                    SOME "output sql script as <file>"),
              ("endpoints", ONE ("<file>", Settings.setEndpoints o SOME),
                    SOME "output exposed URL endpoints in JSON as <file>"),
              ("static", call_true Settings.setStaticLinking,
                    SOME "enable static linking"),
              ("stop", ONE ("<phase>", Compiler.setStop),
                    SOME "stop compilation after <phase>"),
              ("path", TWO ("<name>", "<path>", Compiler.addPath),
                    SOME ("set path variable <name> to <path> for use in "^
                          ".urp files")),
              ("root", TWO ("<name>", "<path>",
                            (fn (name, path) =>
                                Compiler.addModuleRoot (path, name))),
                    SOME "prefix names of modules found in <path> with <name>"),
              ("boot", ZERO (fn () =>
                            (Compiler.enableBoot ();
                             Settings.setBootLinking true)),
                    SOME ("run from build tree and generate statically linked "^
                          "executables ")),
              ("sigfile", ONE ("<file>", Settings.setSigFile o SOME),
                    SOME "search for cryptographic signing keys in <file>"),
              ("iflow", set_true Compiler.doIflow,
                    NONE),
              ("sqlcache", call_true Settings.setSqlcache,
                    NONE),
              ("heuristic", ONE ("<h>", Sqlcache.setHeuristic),
                    NONE),
              ("moduleOf", ONE ("<file>", printModuleOf),
                    SOME "print module name of <file> and exit"),
              ("noEmacs", set_true Demo.noEmacs,
                    NONE),
              ("limit", TWO ("<class>", "<num>", add_class),
                    SOME "set resource usage limit for <class> to <num>"),
              ("explainEmbed", set_true JsComp.explainEmbed,
                    SOME ("explain errors about embedding of server-side "^
                          "values in client code"))
        ]

        val () = case args of
                     ["daemon", "stop"] => (OS.FileSys.remove socket handle OS.SysErr _ => ();
                                            raise DaemonExit)
                   | _ => ()

        val sources = parse_flags (flag_info ()) args

        val job =
            case sources of
                [file] => file
              | [] =>
                    raise Fail "No project specified, see -help"
              | files =>
                    raise Fail ("Multiple projects specified;"^
                                " only one is allowed.\nSpecified projects: "^
                                String.concatWith ", " files)
    in
        case (!css, !demo, !tutorial) of
            (true, _, _) =>
            (case Compiler.run Compiler.toCss job of
                 NONE => OS.Process.failure
               | SOME {Overall = ov, Classes = cl} =>
                 (app (print o Css.inheritableToString) ov;
                  print "\n";
                  app (fn (x, (ins, ots)) =>
                          (print x;
                           print " ";
                           app (print o Css.inheritableToString) ins;
                           app (print o Css.othersToString) ots;
                           print "\n")) cl;
                  OS.Process.success))
          | (_, SOME (prefix, guided), _) =>
            if Demo.make' {prefix = prefix, dirname = job, guided = guided} then
                OS.Process.success
            else
                OS.Process.failure
          | (_, _, true) => (Tutorial.make job;
                                OS.Process.success)
          | _ =>
            if !tc then
                (Compiler.check Compiler.toElaborate job;
                 if ErrorMsg.anyErrors () then
                     OS.Process.failure
                 else
                     OS.Process.success)
            else if !timing then
                (Compiler.time Compiler.toCjrize job;
                 OS.Process.success)
            else
                (if Compiler.compile job then
                     OS.Process.success
                 else
                     OS.Process.failure)
    end handle Code n => n

fun send (sock, s) =
    let
        val n = Socket.sendVec (sock, Word8VectorSlice.full (MLton.Word8Vector.fromPoly (Vector.map (Word8.fromInt o ord) (MLton.CharVector.toPoly s))))
    in
        if n >= size s then
            ()
        else
            send (sock, String.extract (s, n, NONE))
    end

fun startDaemon () =
    if OS.FileSys.access (socket, []) then
        (print ("It looks like a daemon is already listening in this directory,\n"
                ^ "though it's possible a daemon died without cleaning up its socket.\n");
         OS.Process.exit OS.Process.failure)
    else case Posix.Process.fork () of
             SOME _ => ()
           | NONE =>
             let
                 val () = Elaborate.incremental := true
                 val listen = UnixSock.Strm.socket ()

                 fun loop () =
                     let
                         val (sock, _) = Socket.accept listen

                         fun loop' (buf, args) =
                             let
                                 val s = if CharVector.exists (fn ch => ch = #"\n") buf then
                                             ""
                                         else
                                             MLton.CharVector.fromPoly (Vector.map (chr o Word8.toInt) (MLton.Word8Vector.toPoly (Socket.recvVec (sock, 1024))))
                                 val s = buf ^ s
                                 val (befor, after) = Substring.splitl (fn ch => ch <> #"\n") (Substring.full s)
                             in
                                 if Substring.isEmpty after then
                                     loop' (s, args)
                                 else
                                     let
                                         val cmd = Substring.string befor
                                         val rest = Substring.string (Substring.slice (after, 1, NONE))
                                     in
                                         case cmd of
                                             "" =>
                                             (case args of
                                                  ["stop", "daemon"] =>
                                                  (((Socket.close listen;
                                                     OS.FileSys.remove socket) handle OS.SysErr _ => ());
                                                   OS.Process.exit OS.Process.success)
                                                | _ =>
                                                  let
                                                      val success = (oneRun (rev args) handle DaemonExit => OS.Process.exit OS.Process.success)
                                                                    handle ex => (print "unhandled exception:\n";
                                                                                  print (General.exnMessage ex ^ "\n");
                                                                                  OS.Process.failure)
                                                  in
                                                      TextIO.flushOut TextIO.stdOut;
                                                      TextIO.flushOut TextIO.stdErr;
                                                      send (sock, if OS.Process.isSuccess success then
                                                                      "\001"
                                                                  else
                                                                      "\002")
                                                  end)
                                           | _ => loop' (rest, cmd :: args)
                                     end
                             end handle OS.SysErr _ => ()

                         fun redirect old =
                             Posix.IO.dup2 {old = valOf (Posix.FileSys.iodToFD (Socket.ioDesc sock)),
                                            new = old}

                         val oldStdout = Posix.IO.dup Posix.FileSys.stdout
                         val oldStderr = Posix.IO.dup Posix.FileSys.stderr
                     in
                         (* Redirect the daemon's output to the socket. *)
                         redirect Posix.FileSys.stdout;
                         redirect Posix.FileSys.stderr;

                         loop' ("", []);
                         Socket.close sock;

                         Posix.IO.dup2 {old = oldStdout, new = Posix.FileSys.stdout};
                         Posix.IO.dup2 {old = oldStderr, new = Posix.FileSys.stderr};
                         Posix.IO.close oldStdout;
                         Posix.IO.close oldStderr;

                         Settings.reset ();
                         MLton.GC.pack ();
                         loop ()
                     end
             in
                 OS.Process.atExit (fn () => OS.FileSys.remove socket);
                 Socket.bind (listen, UnixSock.toAddr socket);
                 Socket.listen (listen, 1);
                 loop ()
             end

fun oneCommandLine args =
    let
        val sock = UnixSock.Strm.socket ()

        fun wait () =
            let
                val v = Socket.recvVec (sock, 1024)
            in
                if Word8Vector.length v = 0 then
                    OS.Process.failure
                else
                    let
                        val s = MLton.CharVector.fromPoly (Vector.map (chr o Word8.toInt) (MLton.Word8Vector.toPoly v))
                        val last = Word8Vector.sub (v, Word8Vector.length v - 1)
                        val (rc, s) = if last = Word8.fromInt 1 then
                                          (SOME OS.Process.success, String.substring (s, 0, size s - 1))
                                      else if last = Word8.fromInt 2 then
                                          (SOME OS.Process.failure, String.substring (s, 0, size s - 1))
                                      else
                                          (NONE, s)
                    in
                        print s;
                        case rc of
                            NONE => wait ()
                          | SOME rc => rc
                    end
            end handle OS.SysErr _ => OS.Process.failure
    in
        if Socket.connectNB (sock, UnixSock.toAddr socket)
           orelse not (List.null (#wrs (Socket.select {rds = [],
                                                       wrs = [Socket.sockDesc sock],
                                                       exs = [],
                                                       timeout = SOME (Time.fromSeconds 1)}))) then
            (app (fn arg => send (sock, arg ^ "\n")) args;
             send (sock, "\n");
             wait ())
        else
            (OS.FileSys.remove socket;
             raise OS.SysErr ("", NONE))
    end handle OS.SysErr _ => oneRun args handle DaemonExit => OS.Process.success
            
val () = (Globals.setResetTime ();
          case CommandLine.arguments () of
              ["daemon", "start"] => startDaemon ()
            | ["daemon", "restart"] =>
              (ignore (oneCommandLine ["daemon", "stop"]);
               startDaemon ())
            | args => OS.Process.exit (oneCommandLine args))