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
// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

//! Generated protobuf code and companion impls.

use std::borrow::Cow;
use std::char::CharTryFromError;
use std::collections::{BTreeMap, BTreeSet};
use std::fmt;
use std::num::{NonZeroU64, TryFromIntError};

use mz_ore::cast::CastFrom;
use mz_ore::num::{NonNeg, NonNegError};
use num::Signed;
use proptest::prelude::Strategy;
use uuid::Uuid;

#[cfg(feature = "chrono")]
pub mod chrono;

#[cfg(feature = "tokio-postgres")]
pub mod tokio_postgres;

include!(concat!(env!("OUT_DIR"), "/mz_proto.rs"));

/// An error thrown when trying to convert from a `*.proto`-generated type
/// `Proto$T` to `$T`.
#[derive(Debug)]
pub enum TryFromProtoError {
    /// A wrapped [`TryFromIntError`] due to failed integer downcast.
    TryFromIntError(TryFromIntError),
    /// A wrapped [`NonNegError`] due to non-negative invariant being violated.
    NonNegError(NonNegError),
    /// A wrapped [`CharTryFromError`] due to failed [`char`] conversion.
    CharTryFromError(CharTryFromError),
    /// A date conversion failed
    DateConversionError(String),
    /// A regex compilation failed
    RegexError(regex::Error),
    /// A mz_repr::Row conversion failed
    RowConversionError(String),
    /// A JSON deserialization failed.
    /// TODO: Remove this when we have complete coverage for source and sink structs.
    DeserializationError(serde_json::Error),
    /// Indicates an `Option<U>` field in the `Proto$T` that should be set,
    /// but for some reason it is not. In practice this should never occur.
    MissingField(String),
    /// Indicates an unknown enum variant in `Proto$T`.
    UnknownEnumVariant(String),
    /// Indicates that the serialized ShardId value failed to deserialize, according
    /// to its custom deserialization logic.
    InvalidShardId(String),
    /// Indicates that the serialized persist state declared a codec different
    /// than the one declared in the state.
    CodecMismatch(String),
    /// Indicates that the serialized persist state being decoded was internally inconsistent.
    InvalidPersistState(String),
    /// Failed to parse a semver::Version.
    InvalidSemverVersion(String),
    /// Failed to parse a serialized URI
    InvalidUri(http::uri::InvalidUri),
    /// Failed to read back a serialized Glob
    GlobError(globset::Error),
    /// Failed to parse a serialized URL
    InvalidUrl(url::ParseError),
    /// Failed to parse bitflags.
    InvalidBitFlags(String),
    /// Failed to deserialize a LIKE/ILIKE pattern.
    LikePatternDeserializationError(String),
}

impl TryFromProtoError {
    /// Construct a new [`TryFromProtoError::MissingField`] instance.
    pub fn missing_field<T: ToString>(s: T) -> TryFromProtoError {
        TryFromProtoError::MissingField(s.to_string())
    }

    /// Construct a new [`TryFromProtoError::UnknownEnumVariant`] instance.
    pub fn unknown_enum_variant<T: ToString>(s: T) -> TryFromProtoError {
        TryFromProtoError::UnknownEnumVariant(s.to_string())
    }
}

impl From<TryFromIntError> for TryFromProtoError {
    fn from(error: TryFromIntError) -> Self {
        TryFromProtoError::TryFromIntError(error)
    }
}

impl From<NonNegError> for TryFromProtoError {
    fn from(error: NonNegError) -> Self {
        TryFromProtoError::NonNegError(error)
    }
}

impl From<CharTryFromError> for TryFromProtoError {
    fn from(error: CharTryFromError) -> Self {
        TryFromProtoError::CharTryFromError(error)
    }
}

// These From impls pull a bunch of deps into this crate that are otherwise
// unnecessary. Are they worth it?

impl From<regex::Error> for TryFromProtoError {
    fn from(error: regex::Error) -> Self {
        TryFromProtoError::RegexError(error)
    }
}

impl From<serde_json::Error> for TryFromProtoError {
    fn from(error: serde_json::Error) -> Self {
        TryFromProtoError::DeserializationError(error)
    }
}

impl From<http::uri::InvalidUri> for TryFromProtoError {
    fn from(error: http::uri::InvalidUri) -> Self {
        TryFromProtoError::InvalidUri(error)
    }
}

impl From<globset::Error> for TryFromProtoError {
    fn from(error: globset::Error) -> Self {
        TryFromProtoError::GlobError(error)
    }
}

impl From<url::ParseError> for TryFromProtoError {
    fn from(error: url::ParseError) -> Self {
        TryFromProtoError::InvalidUrl(error)
    }
}

impl std::fmt::Display for TryFromProtoError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        use TryFromProtoError::*;
        match self {
            TryFromIntError(error) => error.fmt(f),
            NonNegError(error) => error.fmt(f),
            CharTryFromError(error) => error.fmt(f),
            DateConversionError(msg) => write!(f, "Date conversion failed: `{}`", msg),
            RegexError(error) => error.fmt(f),
            DeserializationError(error) => error.fmt(f),
            RowConversionError(msg) => write!(f, "Row packing failed: `{}`", msg),
            MissingField(field) => write!(f, "Missing value for `{}`", field),
            UnknownEnumVariant(field) => write!(f, "Unknown enum value for `{}`", field),
            InvalidShardId(value) => write!(f, "Invalid value of ShardId found: `{}`", value),
            CodecMismatch(error) => error.fmt(f),
            InvalidPersistState(error) => error.fmt(f),
            InvalidSemverVersion(error) => error.fmt(f),
            InvalidUri(error) => error.fmt(f),
            GlobError(error) => error.fmt(f),
            InvalidUrl(error) => error.fmt(f),
            InvalidBitFlags(error) => error.fmt(f),
            LikePatternDeserializationError(inner_error) => write!(
                f,
                "Protobuf deserialization failed for a LIKE/ILIKE pattern: `{}`",
                inner_error
            ),
        }
    }
}

/// Allow `?` operator on `Result<_, TryFromProtoError>` in contexts
/// where the error type is a `String`.
impl From<TryFromProtoError> for String {
    fn from(error: TryFromProtoError) -> Self {
        error.to_string()
    }
}

impl std::error::Error for TryFromProtoError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        use TryFromProtoError::*;
        match self {
            TryFromIntError(error) => Some(error),
            NonNegError(error) => Some(error),
            CharTryFromError(error) => Some(error),
            RegexError(error) => Some(error),
            DeserializationError(error) => Some(error),
            DateConversionError(_) => None,
            RowConversionError(_) => None,
            MissingField(_) => None,
            UnknownEnumVariant(_) => None,
            InvalidShardId(_) => None,
            CodecMismatch(_) => None,
            InvalidPersistState(_) => None,
            InvalidSemverVersion(_) => None,
            InvalidUri(error) => Some(error),
            GlobError(error) => Some(error),
            InvalidUrl(error) => Some(error),
            InvalidBitFlags(_) => None,
            LikePatternDeserializationError(_) => None,
        }
    }
}

pub fn any_uuid() -> impl Strategy<Value = Uuid> {
    (0..u128::MAX).prop_map(Uuid::from_u128)
}

/// A trait that declares that `Self::Proto` is the default
/// Protobuf representation for `Self`.
pub trait ProtoRepr: Sized + RustType<Self::Proto> {
    type Proto: ::prost::Message;
}

/// A trait for representing a Rust type `Self` as a value of
/// type `Proto` for the purpose of serializing this
/// value as (part of) a Protobuf message.
///
/// To encode a value, use [`RustType::into_proto()`] (which
/// should always be an infallible conversion).
///
/// To decode a value, use the fallible [`RustType::from_proto()`].
/// Since the representation type can be "bigger" than the original,
/// decoding may fail, indicated by returning a [`TryFromProtoError`]
/// wrapped in a [`Result::Err`].
///
/// Convenience syntax for the above methods is available from the
/// matching [`ProtoType`].
pub trait RustType<Proto>: Sized {
    /// Convert a `Self` into a `Proto` value.
    fn into_proto(&self) -> Proto;

    /// Consume and convert a `Proto` back into a `Self` value.
    ///
    /// Since `Proto` can be "bigger" than the original, this
    /// may fail, indicated by returning a [`TryFromProtoError`]
    /// wrapped in a [`Result::Err`].
    fn from_proto(proto: Proto) -> Result<Self, TryFromProtoError>;
}

/// A trait that allows `Self` to be used as an entry in a
/// `Vec<Self>` representing a Rust `*Map<K, V>`.
pub trait ProtoMapEntry<K, V> {
    fn from_rust<'a>(entry: (&'a K, &'a V)) -> Self;
    fn into_rust(self) -> Result<(K, V), TryFromProtoError>;
}

macro_rules! rust_type_id(
    ($($t:ty),*) => (
        $(
            /// Identity type for $t.
            impl RustType<$t> for $t {
                #[inline]
                fn into_proto(&self) -> $t {
                    self.clone()
                }

                #[inline]
                fn from_proto(proto: $t) -> Result<Self, TryFromProtoError> {
                    Ok(proto)
                }
            }
        )+
    );
);

rust_type_id![bool, f32, f64, i32, i64, String, u32, u64, Vec<u8>];

impl RustType<u64> for Option<NonZeroU64> {
    fn into_proto(&self) -> u64 {
        match self {
            Some(d) => d.get(),
            None => 0,
        }
    }

    fn from_proto(proto: u64) -> Result<Self, TryFromProtoError> {
        Ok(NonZeroU64::new(proto)) // 0 is correctly mapped to None
    }
}

/// Blanket implementation for `BTreeMap<K, V>` where there exists `T` such
/// that `T` implements `ProtoMapEntry<K, V>`.
impl<K, V, T> RustType<Vec<T>> for BTreeMap<K, V>
where
    K: std::cmp::Eq + std::cmp::Ord,
    T: ProtoMapEntry<K, V>,
{
    fn into_proto(&self) -> Vec<T> {
        self.iter().map(T::from_rust).collect()
    }

    fn from_proto(proto: Vec<T>) -> Result<Self, TryFromProtoError> {
        proto
            .into_iter()
            .map(T::into_rust)
            .collect::<Result<BTreeMap<_, _>, _>>()
    }
}

/// Blanket implementation for `BTreeSet<R>` where `R` is a [`RustType`].
impl<R, P> RustType<Vec<P>> for BTreeSet<R>
where
    R: RustType<P> + std::cmp::Ord,
{
    fn into_proto(&self) -> Vec<P> {
        self.iter().map(R::into_proto).collect()
    }

    fn from_proto(proto: Vec<P>) -> Result<Self, TryFromProtoError> {
        proto
            .into_iter()
            .map(R::from_proto)
            .collect::<Result<BTreeSet<_>, _>>()
    }
}

/// Blanket implementation for `Vec<R>` where `R` is a [`RustType`].
impl<R, P> RustType<Vec<P>> for Vec<R>
where
    R: RustType<P>,
{
    fn into_proto(&self) -> Vec<P> {
        self.iter().map(R::into_proto).collect()
    }

    fn from_proto(proto: Vec<P>) -> Result<Self, TryFromProtoError> {
        proto
            .into_iter()
            .map(R::from_proto)
            .collect::<Result<Vec<_>, _>>()
    }
}

/// Blanket implementation for `Option<R>` where `R` is a [`RustType`].
impl<R, P> RustType<Option<P>> for Option<R>
where
    R: RustType<P>,
{
    fn into_proto(&self) -> Option<P> {
        self.as_ref().map(R::into_proto)
    }

    fn from_proto(proto: Option<P>) -> Result<Self, TryFromProtoError> {
        proto.map(R::from_proto).transpose()
    }
}

/// Blanket implementation for `Box<R>` where `R` is a [`RustType`].
impl<R, P> RustType<Box<P>> for Box<R>
where
    R: RustType<P>,
{
    fn into_proto(&self) -> Box<P> {
        Box::new((**self).into_proto())
    }

    fn from_proto(proto: Box<P>) -> Result<Self, TryFromProtoError> {
        (*proto).into_rust().map(Box::new)
    }
}

impl<R1, R2, P1, P2> RustType<(P1, P2)> for (R1, R2)
where
    R1: RustType<P1>,
    R2: RustType<P2>,
{
    fn into_proto(&self) -> (P1, P2) {
        (self.0.into_proto(), self.1.into_proto())
    }

    fn from_proto(proto: (P1, P2)) -> Result<Self, TryFromProtoError> {
        let first = proto.0.into_rust()?;
        let second = proto.1.into_rust()?;

        Ok((first, second))
    }
}

impl RustType<()> for () {
    fn into_proto(&self) -> () {
        *self
    }

    fn from_proto(proto: ()) -> Result<Self, TryFromProtoError> {
        Ok(proto)
    }
}

impl RustType<u64> for usize {
    fn into_proto(&self) -> u64 {
        u64::cast_from(*self)
    }

    fn from_proto(proto: u64) -> Result<Self, TryFromProtoError> {
        usize::try_from(proto).map_err(TryFromProtoError::from)
    }
}

impl RustType<u32> for char {
    fn into_proto(&self) -> u32 {
        (*self).into()
    }

    fn from_proto(proto: u32) -> Result<Self, TryFromProtoError> {
        char::try_from(proto).map_err(TryFromProtoError::from)
    }
}

impl RustType<u32> for u8 {
    fn into_proto(&self) -> u32 {
        u32::from(*self)
    }

    fn from_proto(proto: u32) -> Result<Self, TryFromProtoError> {
        u8::try_from(proto).map_err(TryFromProtoError::from)
    }
}

impl RustType<u32> for u16 {
    fn into_proto(&self) -> u32 {
        u32::from(*self)
    }

    fn from_proto(repr: u32) -> Result<Self, TryFromProtoError> {
        u16::try_from(repr).map_err(TryFromProtoError::from)
    }
}

impl RustType<i32> for i8 {
    fn into_proto(&self) -> i32 {
        i32::from(*self)
    }

    fn from_proto(proto: i32) -> Result<Self, TryFromProtoError> {
        i8::try_from(proto).map_err(TryFromProtoError::from)
    }
}

impl RustType<i32> for i16 {
    fn into_proto(&self) -> i32 {
        i32::from(*self)
    }

    fn from_proto(repr: i32) -> Result<Self, TryFromProtoError> {
        i16::try_from(repr).map_err(TryFromProtoError::from)
    }
}

impl RustType<ProtoU128> for u128 {
    // TODO(benesch): add a trait for explicitly performing truncating casts.
    #[allow(clippy::as_conversions)]
    fn into_proto(&self) -> ProtoU128 {
        let lo = (self & u128::from(u64::MAX)) as u64;
        let hi = (self >> 64) as u64;
        ProtoU128 { hi, lo }
    }

    fn from_proto(proto: ProtoU128) -> Result<Self, TryFromProtoError> {
        Ok(u128::from(proto.hi) << 64 | u128::from(proto.lo))
    }
}

impl RustType<ProtoU128> for Uuid {
    fn into_proto(&self) -> ProtoU128 {
        self.as_u128().into_proto()
    }

    fn from_proto(proto: ProtoU128) -> Result<Self, TryFromProtoError> {
        Ok(Uuid::from_u128(u128::from_proto(proto)?))
    }
}

impl RustType<u64> for std::num::NonZeroUsize {
    fn into_proto(&self) -> u64 {
        usize::from(*self).into_proto()
    }

    fn from_proto(proto: u64) -> Result<Self, TryFromProtoError> {
        Ok(usize::from_proto(proto)?.try_into()?)
    }
}

impl<T> RustType<T> for NonNeg<T>
where
    T: Clone + Signed + fmt::Display,
{
    fn into_proto(&self) -> T {
        (**self).clone()
    }

    fn from_proto(proto: T) -> Result<Self, TryFromProtoError> {
        Ok(NonNeg::<T>::try_from(proto)?)
    }
}

impl RustType<ProtoDuration> for std::time::Duration {
    fn into_proto(&self) -> ProtoDuration {
        ProtoDuration {
            secs: self.as_secs(),
            nanos: self.subsec_nanos(),
        }
    }

    fn from_proto(proto: ProtoDuration) -> Result<Self, TryFromProtoError> {
        Ok(std::time::Duration::new(proto.secs, proto.nanos))
    }
}

impl<'a> RustType<String> for Cow<'a, str> {
    fn into_proto(&self) -> String {
        self.to_string()
    }
    fn from_proto(proto: String) -> Result<Self, TryFromProtoError> {
        Ok(Cow::Owned(proto))
    }
}

/// The symmetric counterpart of [`RustType`], similar to
/// what [`Into`] is to [`From`].
///
/// The `Rust` parameter is generic, as opposed to the `Proto`
/// associated type in [`RustType`] because the same Protobuf type
/// can be used to encode many different Rust types.
///
/// Clients should only implement [`RustType`].
pub trait ProtoType<Rust>: Sized {
    /// See [`RustType::from_proto`].
    fn into_rust(self) -> Result<Rust, TryFromProtoError>;

    /// See [`RustType::into_proto`].
    fn from_rust(rust: &Rust) -> Self;
}

/// Blanket implementation for [`ProtoType`], so clients only need
/// to implement [`RustType`].
impl<P, R> ProtoType<R> for P
where
    R: RustType<P>,
{
    #[inline]
    fn into_rust(self) -> Result<R, TryFromProtoError> {
        R::from_proto(self)
    }

    #[inline]
    fn from_rust(rust: &R) -> Self {
        R::into_proto(rust)
    }
}

pub fn any_duration() -> impl Strategy<Value = std::time::Duration> {
    (0..u64::MAX, 0..1_000_000_000u32)
        .prop_map(|(secs, nanos)| std::time::Duration::new(secs, nanos))
}

/// Convenience syntax for trying to convert a `Self` value of type
/// `Option<U>` to `T` if the value is `Some(value)`, or returning
/// [`TryFromProtoError::MissingField`] if the value is `None`.
pub trait IntoRustIfSome<T> {
    fn into_rust_if_some<S: ToString>(self, field: S) -> Result<T, TryFromProtoError>;
}

/// A blanket implementation for `Option<U>` where `U` is the
/// `RustType::Proto` type for `T`.
impl<R, P> IntoRustIfSome<R> for Option<P>
where
    R: RustType<P>,
{
    fn into_rust_if_some<S: ToString>(self, field: S) -> Result<R, TryFromProtoError> {
        R::from_proto(self.ok_or_else(|| TryFromProtoError::missing_field(field))?)
    }
}

/// Convenience syntax for trying to convert a `Self` value of type
/// `Option<U>` to `T` if the value is `Some(value)`, or returning
/// [`TryFromProtoError::MissingField`] if the value is `None`.
pub trait TryIntoIfSome<T> {
    fn try_into_if_some<S: ToString>(self, field: S) -> Result<T, TryFromProtoError>;
}

/// A blanket implementation for `Option<U>` where `U` is the
/// `Proto$T` type for `T`.
impl<T, U> TryIntoIfSome<T> for Option<U>
where
    T: TryFrom<U, Error = TryFromProtoError>,
{
    fn try_into_if_some<S: ToString>(self, field: S) -> Result<T, TryFromProtoError> {
        self.ok_or_else(|| TryFromProtoError::missing_field(field))?
            .try_into()
    }
}

/// Blanket command for testing if `R` can be converted to its corresponding
/// `ProtoType` and back.
pub fn protobuf_roundtrip<R, P>(val: &R) -> anyhow::Result<R>
where
    P: ProtoType<R> + ::prost::Message + Default,
{
    let vec = P::from_rust(val).encode_to_vec();
    let val = P::decode(&*vec)?.into_rust()?;
    Ok(val)
}

#[cfg(test)]
mod tests {
    use proptest::prelude::*;

    use super::*;

    proptest! {
        #![proptest_config(ProptestConfig::with_cases(4096))]

        #[mz_ore::test]
        #[cfg_attr(miri, ignore)] // too slow
        fn duration_protobuf_roundtrip(expect in any_duration() ) {
            let actual = protobuf_roundtrip::<_, ProtoDuration>(&expect);
            assert!(actual.is_ok());
            assert_eq!(actual.unwrap(), expect);
        }
    }
}