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
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

//! Types used to send and receive primitives between a Thrift client and server.
//!
//! # Examples
//!
//! Create and use a `TInputProtocol`.
//!
//! ```no_run
//! use thrift::protocol::{TBinaryInputProtocol, TInputProtocol};
//! use thrift::transport::TTcpChannel;
//!
//! // create the I/O channel
//! let mut channel = TTcpChannel::new();
//! channel.open("127.0.0.1:9090").unwrap();
//!
//! // create the protocol to decode bytes into types
//! let mut protocol = TBinaryInputProtocol::new(channel, true);
//!
//! // read types from the wire
//! let field_identifier = protocol.read_field_begin().unwrap();
//! let field_contents = protocol.read_string().unwrap();
//! let field_end = protocol.read_field_end().unwrap();
//! ```
//!
//! Create and use a `TOutputProtocol`.
//!
//! ```no_run
//! use thrift::protocol::{TBinaryOutputProtocol, TFieldIdentifier, TOutputProtocol, TType};
//! use thrift::transport::TTcpChannel;
//!
//! // create the I/O channel
//! let mut channel = TTcpChannel::new();
//! channel.open("127.0.0.1:9090").unwrap();
//!
//! // create the protocol to encode types into bytes
//! let mut protocol = TBinaryOutputProtocol::new(channel, true);
//!
//! // write types
//! protocol.write_field_begin(&TFieldIdentifier::new("string_thing", TType::String, 1)).unwrap();
//! protocol.write_string("foo").unwrap();
//! protocol.write_field_end().unwrap();
//! ```

use std::convert::{From, TryFrom};
use std::fmt;
use std::fmt::{Display, Formatter};

use crate::transport::{TReadTransport, TWriteTransport};
use crate::{ProtocolError, ProtocolErrorKind};

#[cfg(test)]
macro_rules! assert_eq_written_bytes {
    ($o_prot:ident, $expected_bytes:ident) => {{
        assert_eq!($o_prot.transport.write_bytes(), &$expected_bytes);
    }};
}

// FIXME: should take both read and write
#[cfg(test)]
macro_rules! copy_write_buffer_to_read_buffer {
    ($o_prot:ident) => {{
        $o_prot.transport.copy_write_buffer_to_read_buffer();
    }};
}

#[cfg(test)]
macro_rules! set_readable_bytes {
    ($i_prot:ident, $bytes:expr) => {
        $i_prot.transport.set_readable_bytes($bytes);
    };
}

mod binary;
mod compact;
mod multiplexed;
mod stored;

pub use self::binary::{
    TBinaryInputProtocol, TBinaryInputProtocolFactory, TBinaryOutputProtocol,
    TBinaryOutputProtocolFactory,
};
pub use self::compact::{
    TCompactInputProtocol, TCompactInputProtocolFactory, TCompactOutputProtocol,
    TCompactOutputProtocolFactory,
};
pub use self::multiplexed::TMultiplexedOutputProtocol;
pub use self::stored::TStoredInputProtocol;

/// Reads and writes the struct to Thrift protocols.
///
/// It is implemented in generated code for Thrift `struct`, `union`, and `enum` types.
pub trait TSerializable: Sized {
    fn read_from_in_protocol(i_prot: &mut dyn TInputProtocol) -> crate::Result<Self>;
    fn write_to_out_protocol(&self, o_prot: &mut dyn TOutputProtocol) -> crate::Result<()>;
}

// Default maximum depth to which `TInputProtocol::skip` will skip a Thrift
// field. A default is necessary because Thrift structs or collections may
// contain nested structs and collections, which could result in indefinite
// recursion.
const MAXIMUM_SKIP_DEPTH: i8 = 64;

/// Converts a stream of bytes into Thrift identifiers, primitives,
/// containers, or structs.
///
/// This trait does not deal with higher-level Thrift concepts like structs or
/// exceptions - only with primitives and message or container boundaries. Once
/// bytes are read they are deserialized and an identifier (for example
/// `TMessageIdentifier`) or a primitive is returned.
///
/// All methods return a `thrift::Result`. If an `Err` is returned the protocol
/// instance and its underlying transport should be terminated.
///
/// # Examples
///
/// Create and use a `TInputProtocol`
///
/// ```no_run
/// use thrift::protocol::{TBinaryInputProtocol, TInputProtocol};
/// use thrift::transport::TTcpChannel;
///
/// let mut channel = TTcpChannel::new();
/// channel.open("127.0.0.1:9090").unwrap();
///
/// let mut protocol = TBinaryInputProtocol::new(channel, true);
///
/// let field_identifier = protocol.read_field_begin().unwrap();
/// let field_contents = protocol.read_string().unwrap();
/// let field_end = protocol.read_field_end().unwrap();
/// ```
pub trait TInputProtocol {
    /// Read the beginning of a Thrift message.
    fn read_message_begin(&mut self) -> crate::Result<TMessageIdentifier>;
    /// Read the end of a Thrift message.
    fn read_message_end(&mut self) -> crate::Result<()>;
    /// Read the beginning of a Thrift struct.
    fn read_struct_begin(&mut self) -> crate::Result<Option<TStructIdentifier>>;
    /// Read the end of a Thrift struct.
    fn read_struct_end(&mut self) -> crate::Result<()>;
    /// Read the beginning of a Thrift struct field.
    fn read_field_begin(&mut self) -> crate::Result<TFieldIdentifier>;
    /// Read the end of a Thrift struct field.
    fn read_field_end(&mut self) -> crate::Result<()>;
    /// Read a bool.
    fn read_bool(&mut self) -> crate::Result<bool>;
    /// Read a fixed-length byte array.
    fn read_bytes(&mut self) -> crate::Result<Vec<u8>>;
    /// Read a word.
    fn read_i8(&mut self) -> crate::Result<i8>;
    /// Read a 16-bit signed integer.
    fn read_i16(&mut self) -> crate::Result<i16>;
    /// Read a 32-bit signed integer.
    fn read_i32(&mut self) -> crate::Result<i32>;
    /// Read a 64-bit signed integer.
    fn read_i64(&mut self) -> crate::Result<i64>;
    /// Read a 64-bit float.
    fn read_double(&mut self) -> crate::Result<f64>;
    /// Read a fixed-length string (not null terminated).
    fn read_string(&mut self) -> crate::Result<String>;
    /// Read the beginning of a list.
    fn read_list_begin(&mut self) -> crate::Result<TListIdentifier>;
    /// Read the end of a list.
    fn read_list_end(&mut self) -> crate::Result<()>;
    /// Read the beginning of a set.
    fn read_set_begin(&mut self) -> crate::Result<TSetIdentifier>;
    /// Read the end of a set.
    fn read_set_end(&mut self) -> crate::Result<()>;
    /// Read the beginning of a map.
    fn read_map_begin(&mut self) -> crate::Result<TMapIdentifier>;
    /// Read the end of a map.
    fn read_map_end(&mut self) -> crate::Result<()>;
    /// Skip a field with type `field_type` recursively until the default
    /// maximum skip depth is reached.
    fn skip(&mut self, field_type: TType) -> crate::Result<()> {
        self.skip_till_depth(field_type, MAXIMUM_SKIP_DEPTH)
    }
    /// Skip a field with type `field_type` recursively up to `depth` levels.
    fn skip_till_depth(&mut self, field_type: TType, depth: i8) -> crate::Result<()> {
        if depth == 0 {
            return Err(crate::Error::Protocol(ProtocolError {
                kind: ProtocolErrorKind::DepthLimit,
                message: format!("cannot parse past {:?}", field_type),
            }));
        }

        match field_type {
            TType::Bool => self.read_bool().map(|_| ()),
            TType::I08 => self.read_i8().map(|_| ()),
            TType::I16 => self.read_i16().map(|_| ()),
            TType::I32 => self.read_i32().map(|_| ()),
            TType::I64 => self.read_i64().map(|_| ()),
            TType::Double => self.read_double().map(|_| ()),
            TType::String => self.read_string().map(|_| ()),
            TType::Struct => {
                self.read_struct_begin()?;
                loop {
                    let field_ident = self.read_field_begin()?;
                    if field_ident.field_type == TType::Stop {
                        break;
                    }
                    self.skip_till_depth(field_ident.field_type, depth - 1)?;
                }
                self.read_struct_end()
            }
            TType::List => {
                let list_ident = self.read_list_begin()?;
                for _ in 0..list_ident.size {
                    self.skip_till_depth(list_ident.element_type, depth - 1)?;
                }
                self.read_list_end()
            }
            TType::Set => {
                let set_ident = self.read_set_begin()?;
                for _ in 0..set_ident.size {
                    self.skip_till_depth(set_ident.element_type, depth - 1)?;
                }
                self.read_set_end()
            }
            TType::Map => {
                let map_ident = self.read_map_begin()?;
                for _ in 0..map_ident.size {
                    let key_type = map_ident
                        .key_type
                        .expect("non-zero sized map should contain key type");
                    let val_type = map_ident
                        .value_type
                        .expect("non-zero sized map should contain value type");
                    self.skip_till_depth(key_type, depth - 1)?;
                    self.skip_till_depth(val_type, depth - 1)?;
                }
                self.read_map_end()
            }
            u => Err(crate::Error::Protocol(ProtocolError {
                kind: ProtocolErrorKind::Unknown,
                message: format!("cannot skip field type {:?}", &u),
            })),
        }
    }

    // utility (DO NOT USE IN GENERATED CODE!!!!)
    //

    /// Read an unsigned byte.
    ///
    /// This method should **never** be used in generated code.
    fn read_byte(&mut self) -> crate::Result<u8>;
}

/// Converts Thrift identifiers, primitives, containers or structs into a
/// stream of bytes.
///
/// This trait does not deal with higher-level Thrift concepts like structs or
/// exceptions - only with primitives and message or container boundaries.
/// Write methods take an identifier (for example, `TMessageIdentifier`) or a
/// primitive. Any or all of the fields in an identifier may be omitted when
/// writing to the transport. Write methods may even be noops. All of this is
/// transparent to the caller; as long as a matching `TInputProtocol`
/// implementation is used, received messages will be decoded correctly.
///
/// All methods return a `thrift::Result`. If an `Err` is returned the protocol
/// instance and its underlying transport should be terminated.
///
/// # Examples
///
/// Create and use a `TOutputProtocol`
///
/// ```no_run
/// use thrift::protocol::{TBinaryOutputProtocol, TFieldIdentifier, TOutputProtocol, TType};
/// use thrift::transport::TTcpChannel;
///
/// let mut channel = TTcpChannel::new();
/// channel.open("127.0.0.1:9090").unwrap();
///
/// let mut protocol = TBinaryOutputProtocol::new(channel, true);
///
/// protocol.write_field_begin(&TFieldIdentifier::new("string_thing", TType::String, 1)).unwrap();
/// protocol.write_string("foo").unwrap();
/// protocol.write_field_end().unwrap();
/// ```
pub trait TOutputProtocol {
    /// Write the beginning of a Thrift message.
    fn write_message_begin(&mut self, identifier: &TMessageIdentifier) -> crate::Result<()>;
    /// Write the end of a Thrift message.
    fn write_message_end(&mut self) -> crate::Result<()>;
    /// Write the beginning of a Thrift struct.
    fn write_struct_begin(&mut self, identifier: &TStructIdentifier) -> crate::Result<()>;
    /// Write the end of a Thrift struct.
    fn write_struct_end(&mut self) -> crate::Result<()>;
    /// Write the beginning of a Thrift field.
    fn write_field_begin(&mut self, identifier: &TFieldIdentifier) -> crate::Result<()>;
    /// Write the end of a Thrift field.
    fn write_field_end(&mut self) -> crate::Result<()>;
    /// Write a STOP field indicating that all the fields in a struct have been
    /// written.
    fn write_field_stop(&mut self) -> crate::Result<()>;
    /// Write a bool.
    fn write_bool(&mut self, b: bool) -> crate::Result<()>;
    /// Write a fixed-length byte array.
    fn write_bytes(&mut self, b: &[u8]) -> crate::Result<()>;
    /// Write an 8-bit signed integer.
    fn write_i8(&mut self, i: i8) -> crate::Result<()>;
    /// Write a 16-bit signed integer.
    fn write_i16(&mut self, i: i16) -> crate::Result<()>;
    /// Write a 32-bit signed integer.
    fn write_i32(&mut self, i: i32) -> crate::Result<()>;
    /// Write a 64-bit signed integer.
    fn write_i64(&mut self, i: i64) -> crate::Result<()>;
    /// Write a 64-bit float.
    fn write_double(&mut self, d: f64) -> crate::Result<()>;
    /// Write a fixed-length string.
    fn write_string(&mut self, s: &str) -> crate::Result<()>;
    /// Write the beginning of a list.
    fn write_list_begin(&mut self, identifier: &TListIdentifier) -> crate::Result<()>;
    /// Write the end of a list.
    fn write_list_end(&mut self) -> crate::Result<()>;
    /// Write the beginning of a set.
    fn write_set_begin(&mut self, identifier: &TSetIdentifier) -> crate::Result<()>;
    /// Write the end of a set.
    fn write_set_end(&mut self) -> crate::Result<()>;
    /// Write the beginning of a map.
    fn write_map_begin(&mut self, identifier: &TMapIdentifier) -> crate::Result<()>;
    /// Write the end of a map.
    fn write_map_end(&mut self) -> crate::Result<()>;
    /// Flush buffered bytes to the underlying transport.
    fn flush(&mut self) -> crate::Result<()>;

    // utility (DO NOT USE IN GENERATED CODE!!!!)
    //

    /// Write an unsigned byte.
    ///
    /// This method should **never** be used in generated code.
    fn write_byte(&mut self, b: u8) -> crate::Result<()>; // FIXME: REMOVE
}

impl<P> TInputProtocol for Box<P>
where
    P: TInputProtocol + ?Sized,
{
    fn read_message_begin(&mut self) -> crate::Result<TMessageIdentifier> {
        (**self).read_message_begin()
    }

    fn read_message_end(&mut self) -> crate::Result<()> {
        (**self).read_message_end()
    }

    fn read_struct_begin(&mut self) -> crate::Result<Option<TStructIdentifier>> {
        (**self).read_struct_begin()
    }

    fn read_struct_end(&mut self) -> crate::Result<()> {
        (**self).read_struct_end()
    }

    fn read_field_begin(&mut self) -> crate::Result<TFieldIdentifier> {
        (**self).read_field_begin()
    }

    fn read_field_end(&mut self) -> crate::Result<()> {
        (**self).read_field_end()
    }

    fn read_bool(&mut self) -> crate::Result<bool> {
        (**self).read_bool()
    }

    fn read_bytes(&mut self) -> crate::Result<Vec<u8>> {
        (**self).read_bytes()
    }

    fn read_i8(&mut self) -> crate::Result<i8> {
        (**self).read_i8()
    }

    fn read_i16(&mut self) -> crate::Result<i16> {
        (**self).read_i16()
    }

    fn read_i32(&mut self) -> crate::Result<i32> {
        (**self).read_i32()
    }

    fn read_i64(&mut self) -> crate::Result<i64> {
        (**self).read_i64()
    }

    fn read_double(&mut self) -> crate::Result<f64> {
        (**self).read_double()
    }

    fn read_string(&mut self) -> crate::Result<String> {
        (**self).read_string()
    }

    fn read_list_begin(&mut self) -> crate::Result<TListIdentifier> {
        (**self).read_list_begin()
    }

    fn read_list_end(&mut self) -> crate::Result<()> {
        (**self).read_list_end()
    }

    fn read_set_begin(&mut self) -> crate::Result<TSetIdentifier> {
        (**self).read_set_begin()
    }

    fn read_set_end(&mut self) -> crate::Result<()> {
        (**self).read_set_end()
    }

    fn read_map_begin(&mut self) -> crate::Result<TMapIdentifier> {
        (**self).read_map_begin()
    }

    fn read_map_end(&mut self) -> crate::Result<()> {
        (**self).read_map_end()
    }

    fn read_byte(&mut self) -> crate::Result<u8> {
        (**self).read_byte()
    }
}

impl<P> TOutputProtocol for Box<P>
where
    P: TOutputProtocol + ?Sized,
{
    fn write_message_begin(&mut self, identifier: &TMessageIdentifier) -> crate::Result<()> {
        (**self).write_message_begin(identifier)
    }

    fn write_message_end(&mut self) -> crate::Result<()> {
        (**self).write_message_end()
    }

    fn write_struct_begin(&mut self, identifier: &TStructIdentifier) -> crate::Result<()> {
        (**self).write_struct_begin(identifier)
    }

    fn write_struct_end(&mut self) -> crate::Result<()> {
        (**self).write_struct_end()
    }

    fn write_field_begin(&mut self, identifier: &TFieldIdentifier) -> crate::Result<()> {
        (**self).write_field_begin(identifier)
    }

    fn write_field_end(&mut self) -> crate::Result<()> {
        (**self).write_field_end()
    }

    fn write_field_stop(&mut self) -> crate::Result<()> {
        (**self).write_field_stop()
    }

    fn write_bool(&mut self, b: bool) -> crate::Result<()> {
        (**self).write_bool(b)
    }

    fn write_bytes(&mut self, b: &[u8]) -> crate::Result<()> {
        (**self).write_bytes(b)
    }

    fn write_i8(&mut self, i: i8) -> crate::Result<()> {
        (**self).write_i8(i)
    }

    fn write_i16(&mut self, i: i16) -> crate::Result<()> {
        (**self).write_i16(i)
    }

    fn write_i32(&mut self, i: i32) -> crate::Result<()> {
        (**self).write_i32(i)
    }

    fn write_i64(&mut self, i: i64) -> crate::Result<()> {
        (**self).write_i64(i)
    }

    fn write_double(&mut self, d: f64) -> crate::Result<()> {
        (**self).write_double(d)
    }

    fn write_string(&mut self, s: &str) -> crate::Result<()> {
        (**self).write_string(s)
    }

    fn write_list_begin(&mut self, identifier: &TListIdentifier) -> crate::Result<()> {
        (**self).write_list_begin(identifier)
    }

    fn write_list_end(&mut self) -> crate::Result<()> {
        (**self).write_list_end()
    }

    fn write_set_begin(&mut self, identifier: &TSetIdentifier) -> crate::Result<()> {
        (**self).write_set_begin(identifier)
    }

    fn write_set_end(&mut self) -> crate::Result<()> {
        (**self).write_set_end()
    }

    fn write_map_begin(&mut self, identifier: &TMapIdentifier) -> crate::Result<()> {
        (**self).write_map_begin(identifier)
    }

    fn write_map_end(&mut self) -> crate::Result<()> {
        (**self).write_map_end()
    }

    fn flush(&mut self) -> crate::Result<()> {
        (**self).flush()
    }

    fn write_byte(&mut self, b: u8) -> crate::Result<()> {
        (**self).write_byte(b)
    }
}

/// Helper type used by servers to create `TInputProtocol` instances for
/// accepted client connections.
///
/// # Examples
///
/// Create a `TInputProtocolFactory` and use it to create a `TInputProtocol`.
///
/// ```no_run
/// use thrift::protocol::{TBinaryInputProtocolFactory, TInputProtocolFactory};
/// use thrift::transport::TTcpChannel;
///
/// let mut channel = TTcpChannel::new();
/// channel.open("127.0.0.1:9090").unwrap();
///
/// let factory = TBinaryInputProtocolFactory::new();
/// let protocol = factory.create(Box::new(channel));
/// ```
pub trait TInputProtocolFactory {
    // Create a `TInputProtocol` that reads bytes from `transport`.
    fn create(&self, transport: Box<dyn TReadTransport + Send>) -> Box<dyn TInputProtocol + Send>;
}

impl<T> TInputProtocolFactory for Box<T>
where
    T: TInputProtocolFactory + ?Sized,
{
    fn create(&self, transport: Box<dyn TReadTransport + Send>) -> Box<dyn TInputProtocol + Send> {
        (**self).create(transport)
    }
}

/// Helper type used by servers to create `TOutputProtocol` instances for
/// accepted client connections.
///
/// # Examples
///
/// Create a `TOutputProtocolFactory` and use it to create a `TOutputProtocol`.
///
/// ```no_run
/// use thrift::protocol::{TBinaryOutputProtocolFactory, TOutputProtocolFactory};
/// use thrift::transport::TTcpChannel;
///
/// let mut channel = TTcpChannel::new();
/// channel.open("127.0.0.1:9090").unwrap();
///
/// let factory = TBinaryOutputProtocolFactory::new();
/// let protocol = factory.create(Box::new(channel));
/// ```
pub trait TOutputProtocolFactory {
    /// Create a `TOutputProtocol` that writes bytes to `transport`.
    fn create(&self, transport: Box<dyn TWriteTransport + Send>)
        -> Box<dyn TOutputProtocol + Send>;
}

impl<T> TOutputProtocolFactory for Box<T>
where
    T: TOutputProtocolFactory + ?Sized,
{
    fn create(
        &self,
        transport: Box<dyn TWriteTransport + Send>,
    ) -> Box<dyn TOutputProtocol + Send> {
        (**self).create(transport)
    }
}

/// Thrift message identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TMessageIdentifier {
    /// Service call the message is associated with.
    pub name: String,
    /// Message type.
    pub message_type: TMessageType,
    /// Ordered sequence number identifying the message.
    pub sequence_number: i32,
}

impl TMessageIdentifier {
    /// Create a `TMessageIdentifier` for a Thrift service-call named `name`
    /// with message type `message_type` and sequence number `sequence_number`.
    pub fn new<S: Into<String>>(
        name: S,
        message_type: TMessageType,
        sequence_number: i32,
    ) -> TMessageIdentifier {
        TMessageIdentifier {
            name: name.into(),
            message_type,
            sequence_number,
        }
    }
}

/// Thrift struct identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TStructIdentifier {
    /// Name of the encoded Thrift struct.
    pub name: String,
}

impl TStructIdentifier {
    /// Create a `TStructIdentifier` for a struct named `name`.
    pub fn new<S: Into<String>>(name: S) -> TStructIdentifier {
        TStructIdentifier { name: name.into() }
    }
}

/// Thrift field identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TFieldIdentifier {
    /// Name of the Thrift field.
    ///
    /// `None` if it's not sent over the wire.
    pub name: Option<String>,
    /// Field type.
    ///
    /// This may be a primitive, container, or a struct.
    pub field_type: TType,
    /// Thrift field id.
    ///
    /// `None` only if `field_type` is `TType::Stop`.
    pub id: Option<i16>,
}

impl TFieldIdentifier {
    /// Create a `TFieldIdentifier` for a field named `name` with type
    /// `field_type` and field id `id`.
    ///
    /// `id` should be `None` if `field_type` is `TType::Stop`.
    pub fn new<N, S, I>(name: N, field_type: TType, id: I) -> TFieldIdentifier
    where
        N: Into<Option<S>>,
        S: Into<String>,
        I: Into<Option<i16>>,
    {
        TFieldIdentifier {
            name: name.into().map(|n| n.into()),
            field_type,
            id: id.into(),
        }
    }
}

/// Thrift list identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TListIdentifier {
    /// Type of the elements in the list.
    pub element_type: TType,
    /// Number of elements in the list.
    pub size: i32,
}

impl TListIdentifier {
    /// Create a `TListIdentifier` for a list with `size` elements of type
    /// `element_type`.
    pub fn new(element_type: TType, size: i32) -> TListIdentifier {
        TListIdentifier { element_type, size }
    }
}

/// Thrift set identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TSetIdentifier {
    /// Type of the elements in the set.
    pub element_type: TType,
    /// Number of elements in the set.
    pub size: i32,
}

impl TSetIdentifier {
    /// Create a `TSetIdentifier` for a set with `size` elements of type
    /// `element_type`.
    pub fn new(element_type: TType, size: i32) -> TSetIdentifier {
        TSetIdentifier { element_type, size }
    }
}

/// Thrift map identifier.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TMapIdentifier {
    /// Map key type.
    pub key_type: Option<TType>,
    /// Map value type.
    pub value_type: Option<TType>,
    /// Number of entries in the map.
    pub size: i32,
}

impl TMapIdentifier {
    /// Create a `TMapIdentifier` for a map with `size` entries of type
    /// `key_type -> value_type`.
    pub fn new<K, V>(key_type: K, value_type: V, size: i32) -> TMapIdentifier
    where
        K: Into<Option<TType>>,
        V: Into<Option<TType>>,
    {
        TMapIdentifier {
            key_type: key_type.into(),
            value_type: value_type.into(),
            size,
        }
    }
}

/// Thrift message types.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum TMessageType {
    /// Service-call request.
    Call,
    /// Service-call response.
    Reply,
    /// Unexpected error in the remote service.
    Exception,
    /// One-way service-call request (no response is expected).
    OneWay,
}

impl Display for TMessageType {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match *self {
            TMessageType::Call => write!(f, "Call"),
            TMessageType::Reply => write!(f, "Reply"),
            TMessageType::Exception => write!(f, "Exception"),
            TMessageType::OneWay => write!(f, "OneWay"),
        }
    }
}

impl From<TMessageType> for u8 {
    fn from(message_type: TMessageType) -> Self {
        match message_type {
            TMessageType::Call => 0x01,
            TMessageType::Reply => 0x02,
            TMessageType::Exception => 0x03,
            TMessageType::OneWay => 0x04,
        }
    }
}

impl TryFrom<u8> for TMessageType {
    type Error = crate::Error;
    fn try_from(b: u8) -> Result<Self, Self::Error> {
        match b {
            0x01 => Ok(TMessageType::Call),
            0x02 => Ok(TMessageType::Reply),
            0x03 => Ok(TMessageType::Exception),
            0x04 => Ok(TMessageType::OneWay),
            unkn => Err(crate::Error::Protocol(ProtocolError {
                kind: ProtocolErrorKind::InvalidData,
                message: format!("cannot convert {} to TMessageType", unkn),
            })),
        }
    }
}

/// Thrift struct-field types.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum TType {
    /// Indicates that there are no more serialized fields in this Thrift struct.
    Stop,
    /// Void (`()`) field.
    Void,
    /// Boolean.
    Bool,
    /// Signed 8-bit int.
    I08,
    /// Double-precision number.
    Double,
    /// Signed 16-bit int.
    I16,
    /// Signed 32-bit int.
    I32,
    /// Signed 64-bit int.
    I64,
    /// UTF-8 string.
    String,
    /// UTF-7 string. *Unsupported*.
    Utf7,
    /// Thrift struct.
    Struct,
    /// Map.
    Map,
    /// Set.
    Set,
    /// List.
    List,
    /// UTF-8 string.
    Utf8,
    /// UTF-16 string. *Unsupported*.
    Utf16,
}

impl Display for TType {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match *self {
            TType::Stop => write!(f, "STOP"),
            TType::Void => write!(f, "void"),
            TType::Bool => write!(f, "bool"),
            TType::I08 => write!(f, "i08"),
            TType::Double => write!(f, "double"),
            TType::I16 => write!(f, "i16"),
            TType::I32 => write!(f, "i32"),
            TType::I64 => write!(f, "i64"),
            TType::String => write!(f, "string"),
            TType::Utf7 => write!(f, "UTF7"),
            TType::Struct => write!(f, "struct"),
            TType::Map => write!(f, "map"),
            TType::Set => write!(f, "set"),
            TType::List => write!(f, "list"),
            TType::Utf8 => write!(f, "UTF8"),
            TType::Utf16 => write!(f, "UTF16"),
        }
    }
}

/// Compare the expected message sequence number `expected` with the received
/// message sequence number `actual`.
///
/// Return `()` if `actual == expected`, `Err` otherwise.
pub fn verify_expected_sequence_number(expected: i32, actual: i32) -> crate::Result<()> {
    if expected == actual {
        Ok(())
    } else {
        Err(crate::Error::Application(crate::ApplicationError {
            kind: crate::ApplicationErrorKind::BadSequenceId,
            message: format!("expected {} got {}", expected, actual),
        }))
    }
}

/// Compare the expected service-call name `expected` with the received
/// service-call name `actual`.
///
/// Return `()` if `actual == expected`, `Err` otherwise.
pub fn verify_expected_service_call(expected: &str, actual: &str) -> crate::Result<()> {
    if expected == actual {
        Ok(())
    } else {
        Err(crate::Error::Application(crate::ApplicationError {
            kind: crate::ApplicationErrorKind::WrongMethodName,
            message: format!("expected {} got {}", expected, actual),
        }))
    }
}

/// Compare the expected message type `expected` with the received message type
/// `actual`.
///
/// Return `()` if `actual == expected`, `Err` otherwise.
pub fn verify_expected_message_type(
    expected: TMessageType,
    actual: TMessageType,
) -> crate::Result<()> {
    if expected == actual {
        Ok(())
    } else {
        Err(crate::Error::Application(crate::ApplicationError {
            kind: crate::ApplicationErrorKind::InvalidMessageType,
            message: format!("expected {} got {}", expected, actual),
        }))
    }
}

/// Check if a required Thrift struct field exists.
///
/// Return `()` if it does, `Err` otherwise.
pub fn verify_required_field_exists<T>(field_name: &str, field: &Option<T>) -> crate::Result<()> {
    match *field {
        Some(_) => Ok(()),
        None => Err(crate::Error::Protocol(crate::ProtocolError {
            kind: crate::ProtocolErrorKind::Unknown,
            message: format!("missing required field {}", field_name),
        })),
    }
}

/// Extract the field id from a Thrift field identifier.
///
/// `field_ident` must *not* have `TFieldIdentifier.field_type` of type `TType::Stop`.
///
/// Return `TFieldIdentifier.id` if an id exists, `Err` otherwise.
pub fn field_id(field_ident: &TFieldIdentifier) -> crate::Result<i16> {
    field_ident.id.ok_or_else(|| {
        crate::Error::Protocol(crate::ProtocolError {
            kind: crate::ProtocolErrorKind::Unknown,
            message: format!("missing field in in {:?}", field_ident),
        })
    })
}

#[cfg(test)]
mod tests {

    use std::io::Cursor;

    use super::*;
    use crate::transport::{TReadTransport, TWriteTransport};

    #[test]
    fn must_create_usable_input_protocol_from_concrete_input_protocol() {
        let r: Box<dyn TReadTransport> = Box::new(Cursor::new([0, 1, 2]));
        let mut t = TCompactInputProtocol::new(r);
        takes_input_protocol(&mut t)
    }

    #[test]
    fn must_create_usable_input_protocol_from_boxed_input() {
        let r: Box<dyn TReadTransport> = Box::new(Cursor::new([0, 1, 2]));
        let mut t: Box<dyn TInputProtocol> = Box::new(TCompactInputProtocol::new(r));
        takes_input_protocol(&mut t)
    }

    #[test]
    fn must_create_usable_output_protocol_from_concrete_output_protocol() {
        let w: Box<dyn TWriteTransport> = Box::new(vec![0u8; 10]);
        let mut t = TCompactOutputProtocol::new(w);
        takes_output_protocol(&mut t)
    }

    #[test]
    fn must_create_usable_output_protocol_from_boxed_output() {
        let w: Box<dyn TWriteTransport> = Box::new(vec![0u8; 10]);
        let mut t: Box<dyn TOutputProtocol> = Box::new(TCompactOutputProtocol::new(w));
        takes_output_protocol(&mut t)
    }

    fn takes_input_protocol<R>(t: &mut R)
    where
        R: TInputProtocol,
    {
        t.read_byte().unwrap();
    }

    fn takes_output_protocol<W>(t: &mut W)
    where
        W: TOutputProtocol,
    {
        t.flush().unwrap();
    }
}