Added mapping for xid

pgrx-bindgen/src/build.rs

@@ -24,7 +24,7 @@ use std::process::{Command, Output};
 use std::rc::Rc;
 use syn::{Item, ItemConst};
 
-const BLOCKLISTED_TYPES: [&str; 3] = ["Datum", "NullableDatum", "Oid"];
+const BLOCKLISTED_TYPES: [&str; 4] = ["Datum", "NullableDatum", "Oid", "TransactionId"];
 
 // These postgres versions were effectively "yanked" by the community, even tho they still exist
 // in the wild.  pgrx will refuse to compile against them
@@ -348,7 +348,7 @@ fn generate_bindings(
             &bindings_file,
             quote! {
                 use crate as pg_sys;
-                use crate::{Datum, Oid, PgNode};
+                use crate::{Datum, MultiXactId, Oid, PgNode, TransactionId};
             },
             is_for_release,
         )
@@ -864,6 +864,8 @@ pub const {module}_{variant}: {ty} = {value};"#,
 fn add_blocklists(bind: bindgen::Builder) -> bindgen::Builder {
     bind.blocklist_type("Datum") // manually wrapping datum for correctness
         .blocklist_type("Oid") // "Oid" is not just any u32
+        .blocklist_type("TransactionId") // "TransactionId" is not just any u32
+        .blocklist_type("MultiXactId") // it's an alias of "TransactionId"
         .blocklist_var("CONFIGURE_ARGS") // configuration during build is hopefully irrelevant
         .blocklist_var("_*(?:HAVE|have)_.*") // header tracking metadata
         .blocklist_var("_[A-Z_]+_H") // more header metadata

pgrx-pg-sys/src/port.rs

@@ -10,13 +10,13 @@ pub const MaxOffsetNumber: super::OffsetNumber =
     (super::BLCKSZ as usize / std::mem::size_of::<super::ItemIdData>()) as super::OffsetNumber;
 pub const InvalidBlockNumber: u32 = 0xFFFF_FFFF as crate::BlockNumber;
 pub const VARHDRSZ: usize = std::mem::size_of::<super::int32>();
-pub const InvalidTransactionId: super::TransactionId = 0 as super::TransactionId;
 pub const InvalidCommandId: super::CommandId = (!(0 as super::CommandId)) as super::CommandId;
 pub const FirstCommandId: super::CommandId = 0 as super::CommandId;
-pub const BootstrapTransactionId: super::TransactionId = 1 as super::TransactionId;
-pub const FrozenTransactionId: super::TransactionId = 2 as super::TransactionId;
-pub const FirstNormalTransactionId: super::TransactionId = 3 as super::TransactionId;
-pub const MaxTransactionId: super::TransactionId = 0xFFFF_FFFF as super::TransactionId;
+pub const InvalidTransactionId: crate::TransactionId = crate::TransactionId::INVALID;
+pub const BootstrapTransactionId: crate::TransactionId = crate::TransactionId::BOOTSTRAP;
+pub const FrozenTransactionId: crate::TransactionId = crate::TransactionId::FROZEN;
+pub const FirstNormalTransactionId: crate::TransactionId = crate::TransactionId::FIRST_NORMAL;
+pub const MaxTransactionId: crate::TransactionId = crate::TransactionId::MAX;
 
 /// Given a valid HeapTuple pointer, return address of the user data
 ///

pgrx-pg-sys/src/submodules/mod.rs

@@ -8,6 +8,7 @@
 //LICENSE
 //LICENSE Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 pub mod datum;
+pub mod transaction_id;
 #[macro_use]
 pub mod elog;
 pub mod cmp;
@@ -27,6 +28,7 @@ pub mod utils;
 mod sql_translatable;
 
 pub use datum::Datum;
+pub use transaction_id::{MultiXactId, TransactionId};
 
 pub use htup::*;
 pub use oids::*;

pgrx-pg-sys/src/submodules/transaction_id.rs

@@ -0,0 +1,74 @@
+//LICENSE Portions Copyright 2019-2021 ZomboDB, LLC.
+//LICENSE
+//LICENSE Portions Copyright 2021-2023 Technology Concepts & Design, Inc.
+//LICENSE
+//LICENSE Portions Copyright 2023-2023 PgCentral Foundation, Inc. <[email protected]>
+//LICENSE
+//LICENSE All rights reserved.
+//LICENSE
+//LICENSE Use of this source code is governed by the MIT license that can be found in the LICENSE file.
+use pgrx_sql_entity_graph::metadata::{
+    ArgumentError, Returns, ReturnsError, SqlMapping, SqlTranslatable,
+};
+
+pub type MultiXactId = TransactionId;
+
+/// An `xid` type from PostgreSQL
+#[repr(C)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[derive(serde::Deserialize, serde::Serialize)]
+pub struct TransactionId(u32);
+
+impl TransactionId {
+    pub const INVALID: Self = Self::from_u32(0);
+    pub const BOOTSTRAP: Self = Self::from_u32(1);
+    pub const FROZEN: Self = Self::from_u32(2);
+    pub const FIRST_NORMAL: Self = Self::from_u32(3);
+    pub const MAX: Self = Self::from_u32(u32::MAX);
+
+    #[inline]
+    pub const fn from_u32(xid: u32) -> Self {
+        Self(xid)
+    }
+
+    #[inline]
+    pub const fn to_u32(self) -> u32 {
+        self.0
+    }
+}
+
+impl Default for TransactionId {
+    fn default() -> Self {
+        Self::INVALID
+    }
+}
+
+impl From<u32> for TransactionId {
+    #[inline]
+    fn from(xid: u32) -> Self {
+        Self::from_u32(xid)
+    }
+}
+
+impl From<TransactionId> for u32 {
+    #[inline]
+    fn from(xid: TransactionId) -> Self {
+        xid.to_u32()
+    }
+}
+
+impl From<TransactionId> for crate::Datum {
+    fn from(xid: TransactionId) -> Self {
+        xid.to_u32().into()
+    }
+}
+
+unsafe impl SqlTranslatable for TransactionId {
+    fn argument_sql() -> Result<SqlMapping, ArgumentError> {
+        Ok(SqlMapping::literal("xid"))
+    }
+
+    fn return_sql() -> Result<Returns, ReturnsError> {
+        Ok(Returns::One(SqlMapping::literal("xid")))
+    }
+}

pgrx-tests/src/tests/roundtrip_tests.rs

@@ -125,6 +125,7 @@ mod tests {
     roundtrip!(rt_point, test_rt_point, pg_sys::Point, pg_sys::Point { x: 1.0, y: 2.0 });
     roundtrip!(rt_string, test_rt_string, String, String::from("string"));
     roundtrip!(rt_oid, test_rt_oid, pg_sys::Oid, pg_sys::Oid::from(BuiltinOid::ANYOID));
+    roundtrip!(rt_xid, test_rt_xid, pg_sys::TransactionId, pg_sys::TransactionId::FIRST_NORMAL);
     roundtrip!(rt_i16, test_rt_i16, i16, i16::MAX);
     roundtrip!(rt_f64, test_rt_f64, f64, f64::MAX);
     roundtrip!(

pgrx-tests/src/tests/xid64_tests.rs

@@ -21,7 +21,7 @@ mod tests {
 
     #[pg_test]
     fn test_convert_xid_to_u64() {
-        let xid = xid_to_64bit(32768);
+        let xid = xid_to_64bit(32768.into());
         assert_eq!(xid, 32768)
     }
 }

pgrx/src/callconv.rs

@@ -265,7 +265,7 @@ argue_from_datum! { 'fcx; i8, i16, i32, i64, f32, f64, bool, char, String, Vec<u
 argue_from_datum! { 'fcx; Date, Interval, Time, TimeWithTimeZone, Timestamp, TimestampWithTimeZone }
 argue_from_datum! { 'fcx; AnyArray, AnyElement, AnyNumeric }
 argue_from_datum! { 'fcx; Inet, Internal, Json, JsonB, Uuid, PgRelation }
-argue_from_datum! { 'fcx; pg_sys::BOX, pg_sys::ItemPointerData, pg_sys::Oid, pg_sys::Point }
+argue_from_datum! { 'fcx; pg_sys::BOX, pg_sys::ItemPointerData, pg_sys::Oid, pg_sys::Point, pg_sys::TransactionId }
 // We could use the upcoming impl of ArgAbi for `&'fcx T where T: ?Sized + BorrowDatum`
 // to support these types by implementing BorrowDatum for them also, but we reject this.
 // It would greatly complicate other users of BorrowDatum like FlatArray, which want all impls
@@ -566,7 +566,7 @@ impl_repackage_into_datum! {
     String, CString, Vec<u8>, char,
     Json, JsonB, Inet, Uuid, AnyNumeric, AnyArray, AnyElement, Internal,
     Date, Interval, Time, TimeWithTimeZone, Timestamp, TimestampWithTimeZone,
-    pg_sys::BOX, pg_sys::ItemPointerData, pg_sys::Oid, pg_sys::Point
+    pg_sys::BOX, pg_sys::ItemPointerData, pg_sys::Oid, pg_sys::Point, pg_sys::TransactionId
 }
 
 unsafe impl<const P: u32, const S: u32> BoxRet for Numeric<P, S> {

pgrx/src/datum/from.rs

@@ -209,6 +209,21 @@ impl FromDatum for pg_sys::Oid {
     }
 }
 
+impl FromDatum for pg_sys::TransactionId {
+    #[inline]
+    unsafe fn from_polymorphic_datum(
+        datum: pg_sys::Datum,
+        is_null: bool,
+        _typoid: pg_sys::Oid,
+    ) -> Option<Self> {
+        if is_null {
+            None
+        } else {
+            datum.value().try_into().ok().map(Self::from_u32)
+        }
+    }
+}
+
 /// for bool
 impl FromDatum for bool {
     #[inline]

pgrx/src/datum/into.rs

@@ -236,6 +236,22 @@ impl IntoDatum for pg_sys::Oid {
     }
 }
 
+impl IntoDatum for pg_sys::TransactionId {
+    #[inline]
+    fn into_datum(self) -> Option<pg_sys::Datum> {
+        if self == Self::INVALID {
+            None
+        } else {
+            Some(self.into())
+        }
+    }
+
+    #[inline]
+    fn type_oid() -> pg_sys::Oid {
+        pg_sys::XIDOID
+    }
+}
+
 impl IntoDatum for PgOid {
     #[inline]
     fn into_datum(self) -> Option<pg_sys::Datum> {

pgrx/src/xid.rs

@@ -16,14 +16,18 @@ pub fn xid_to_64bit(xid: pg_sys::TransactionId) -> u64 {
     let last_xid = full_xid.value as u32;
     let epoch = (full_xid.value >> 32) as u32;
 
-    convert_xid_common(xid, last_xid, epoch)
+    convert_xid_common(xid, last_xid.into(), epoch)
 }
 
 #[inline]
-fn convert_xid_common(xid: pg_sys::TransactionId, last_xid: u32, epoch: u32) -> u64 {
+fn convert_xid_common(
+    xid: pg_sys::TransactionId,
+    last_xid: pgrx_pg_sys::TransactionId,
+    epoch: u32,
+) -> u64 {
     /* return special xid's as-is */
     if !pg_sys::TransactionIdIsNormal(xid) {
-        return xid as u64;
+        return xid.to_u32() as u64;
     }
 
     /* xid can be on either side when near wrap-around */
@@ -34,5 +38,5 @@ fn convert_xid_common(xid: pg_sys::TransactionId, last_xid: u32, epoch: u32) ->
         epoch += 1;
     }
 
-    (epoch << 32) | xid as u64
+    (epoch << 32) | xid.to_u32() as u64
 }