Line data Source code
1 : #![allow(non_upper_case_globals)]
2 : #![allow(non_camel_case_types)]
3 : #![allow(non_snake_case)]
4 : // bindgen creates some unsafe code with no doc comments.
5 : #![allow(clippy::missing_safety_doc)]
6 : // noted at 1.63 that in many cases there's u32 -> u32 transmutes in bindgen code.
7 : #![allow(clippy::useless_transmute)]
8 : // modules included with the postgres_ffi macro depend on the types of the specific version's
9 : // types, and trigger a too eager lint.
10 : #![allow(clippy::duplicate_mod)]
11 : #![deny(clippy::undocumented_unsafe_blocks)]
12 :
13 : use bytes::Bytes;
14 : use utils::bin_ser::SerializeError;
15 : use utils::lsn::Lsn;
16 :
17 : macro_rules! postgres_ffi {
18 : ($version:ident) => {
19 : #[path = "."]
20 : pub mod $version {
21 : pub mod bindings {
22 : // bindgen generates bindings for a lot of stuff we don't need
23 : #![allow(dead_code)]
24 : #![allow(unsafe_op_in_unsafe_fn)]
25 : #![allow(clippy::undocumented_unsafe_blocks)]
26 : #![allow(clippy::ptr_offset_with_cast)]
27 :
28 : use serde::{Deserialize, Serialize};
29 : include!(concat!(
30 : env!("OUT_DIR"),
31 : "/bindings_",
32 : stringify!($version),
33 : ".rs"
34 : ));
35 :
36 : include!(concat!("pg_constants_", stringify!($version), ".rs"));
37 : }
38 : pub mod controlfile_utils;
39 : pub mod nonrelfile_utils;
40 : pub mod wal_craft_test_export;
41 : pub mod wal_generator;
42 : pub mod waldecoder_handler;
43 : pub mod xlog_utils;
44 :
45 : pub const PG_MAJORVERSION: &str = stringify!($version);
46 :
47 : // Re-export some symbols from bindings
48 : pub use bindings::{CheckPoint, ControlFileData, DBState_DB_SHUTDOWNED, XLogRecord};
49 :
50 : pub const ZERO_CHECKPOINT: bytes::Bytes =
51 : bytes::Bytes::from_static(&[0u8; xlog_utils::SIZEOF_CHECKPOINT]);
52 : }
53 : };
54 : }
55 :
56 : #[macro_export]
57 : macro_rules! for_all_postgres_versions {
58 : ($macro:tt) => {
59 : $macro!(v14);
60 : $macro!(v15);
61 : $macro!(v16);
62 : $macro!(v17);
63 : };
64 : }
65 :
66 : for_all_postgres_versions! { postgres_ffi }
67 :
68 : /// dispatch_pgversion
69 : ///
70 : /// Run a code block in a context where the postgres_ffi bindings for a
71 : /// specific (supported) PostgreSQL version are `use`-ed in scope under the pgv
72 : /// identifier.
73 : /// If the provided pg_version is not supported, we panic!(), unless the
74 : /// optional third argument was provided (in which case that code will provide
75 : /// the default handling instead).
76 : ///
77 : /// Use like
78 : ///
79 : /// dispatch_pgversion!(my_pgversion, { pgv::constants::XLOG_DBASE_CREATE })
80 : /// dispatch_pgversion!(my_pgversion, pgv::constants::XLOG_DBASE_CREATE)
81 : ///
82 : /// Other uses are for macro-internal purposes only and strictly unsupported.
83 : ///
84 : #[macro_export]
85 : macro_rules! dispatch_pgversion {
86 : ($version:expr, $code:expr) => {
87 : dispatch_pgversion!($version, $code, panic!("Unknown PostgreSQL version {}", $version))
88 : };
89 : ($version:expr, $code:expr, $invalid_pgver_handling:expr) => {
90 : dispatch_pgversion!(
91 : $version => $code,
92 : default = $invalid_pgver_handling,
93 : pgversions = [
94 : 14 : v14,
95 : 15 : v15,
96 : 16 : v16,
97 : 17 : v17,
98 : ]
99 : )
100 : };
101 : ($pgversion:expr => $code:expr,
102 : default = $default:expr,
103 : pgversions = [$($sv:literal : $vsv:ident),+ $(,)?]) => {
104 : match ($pgversion) {
105 : $($sv => {
106 : use $crate::$vsv as pgv;
107 : $code
108 : },)+
109 : _ => {
110 : $default
111 : }
112 : }
113 : };
114 : }
115 :
116 : #[macro_export]
117 : macro_rules! enum_pgversion_dispatch {
118 : ($name:expr, $typ:ident, $bind:ident, $code:block) => {
119 : enum_pgversion_dispatch!(
120 : name = $name,
121 : bind = $bind,
122 : typ = $typ,
123 : code = $code,
124 : pgversions = [
125 : V14 : v14,
126 : V15 : v15,
127 : V16 : v16,
128 : V17 : v17,
129 : ]
130 : )
131 : };
132 : (name = $name:expr,
133 : bind = $bind:ident,
134 : typ = $typ:ident,
135 : code = $code:block,
136 : pgversions = [$($variant:ident : $md:ident),+ $(,)?]) => {
137 : match $name {
138 : $(
139 : self::$typ::$variant($bind) => {
140 : use $crate::$md as pgv;
141 : $code
142 : }
143 : ),+,
144 : }
145 : };
146 : }
147 :
148 : #[macro_export]
149 : macro_rules! enum_pgversion {
150 : {$name:ident, pgv :: $t:ident} => {
151 : enum_pgversion!{
152 : name = $name,
153 : typ = $t,
154 : pgversions = [
155 : V14 : v14,
156 : V15 : v15,
157 : V16 : v16,
158 : V17 : v17,
159 : ]
160 : }
161 : };
162 : {$name:ident, pgv :: $p:ident :: $t:ident} => {
163 : enum_pgversion!{
164 : name = $name,
165 : path = $p,
166 : typ = $t,
167 : pgversions = [
168 : V14 : v14,
169 : V15 : v15,
170 : V16 : v16,
171 : V17 : v17,
172 : ]
173 : }
174 : };
175 : {name = $name:ident,
176 : typ = $t:ident,
177 : pgversions = [$($variant:ident : $md:ident),+ $(,)?]} => {
178 : pub enum $name {
179 : $($variant ( $crate::$md::$t )),+
180 : }
181 : impl self::$name {
182 0 : pub fn pg_version(&self) -> u32 {
183 0 : enum_pgversion_dispatch!(self, $name, _ign, {
184 0 : pgv::bindings::PG_MAJORVERSION_NUM
185 : })
186 : }
187 : }
188 : $(
189 : impl Into<self::$name> for $crate::$md::$t {
190 24 : fn into(self) -> self::$name {
191 24 : self::$name::$variant (self)
192 24 : }
193 : }
194 : )+
195 : };
196 : {name = $name:ident,
197 : path = $p:ident,
198 : typ = $t:ident,
199 : pgversions = [$($variant:ident : $md:ident),+ $(,)?]} => {
200 : pub enum $name {
201 : $($variant ($crate::$md::$p::$t)),+
202 : }
203 : impl $name {
204 : pub fn pg_version(&self) -> u32 {
205 : enum_pgversion_dispatch!(self, $name, _ign, {
206 : pgv::bindings::PG_MAJORVERSION_NUM
207 : })
208 : }
209 : }
210 : $(
211 : impl Into<$name> for $crate::$md::$p::$t {
212 : fn into(self) -> $name {
213 : $name::$variant (self)
214 : }
215 : }
216 : )+
217 : };
218 : }
219 :
220 : pub mod pg_constants;
221 : pub mod relfile_utils;
222 : pub mod walrecord;
223 :
224 : // Export some widely used datatypes that are unlikely to change across Postgres versions
225 : pub use v14::bindings::{
226 : BlockNumber, CheckPoint, ControlFileData, MultiXactId, OffsetNumber, Oid, PageHeaderData,
227 : RepOriginId, TimeLineID, TimestampTz, TransactionId, XLogRecPtr, XLogRecord, XLogSegNo, uint32,
228 : uint64,
229 : };
230 : // Likewise for these, although the assumption that these don't change is a little more iffy.
231 : pub use v14::bindings::{MultiXactOffset, MultiXactStatus};
232 : pub use v14::xlog_utils::{
233 : XLOG_SIZE_OF_XLOG_LONG_PHD, XLOG_SIZE_OF_XLOG_RECORD, XLOG_SIZE_OF_XLOG_SHORT_PHD,
234 : };
235 :
236 : // from pg_config.h. These can be changed with configure options --with-blocksize=BLOCKSIZE and
237 : // --with-segsize=SEGSIZE, but assume the defaults for now.
238 : pub const BLCKSZ: u16 = 8192;
239 : pub const RELSEG_SIZE: u32 = 1024 * 1024 * 1024 / (BLCKSZ as u32);
240 : pub const XLOG_BLCKSZ: usize = 8192;
241 : pub const WAL_SEGMENT_SIZE: usize = 16 * 1024 * 1024;
242 :
243 : pub const MAX_SEND_SIZE: usize = XLOG_BLCKSZ * 16;
244 :
245 : // Export some version independent functions that are used outside of this mod
246 : pub use v14::bindings::DBState_DB_SHUTDOWNED;
247 : pub use v14::xlog_utils::{
248 : XLogFileName, encode_logical_message, get_current_timestamp, to_pg_timestamp,
249 : try_from_pg_timestamp,
250 : };
251 :
252 216 : pub fn bkpimage_is_compressed(bimg_info: u8, version: u32) -> bool {
253 216 : dispatch_pgversion!(version, pgv::bindings::bkpimg_is_compressed(bimg_info))
254 216 : }
255 :
256 5 : pub fn generate_wal_segment(
257 5 : segno: u64,
258 5 : system_id: u64,
259 5 : pg_version: u32,
260 5 : lsn: Lsn,
261 5 : ) -> Result<Bytes, SerializeError> {
262 5 : assert_eq!(segno, lsn.segment_number(WAL_SEGMENT_SIZE));
263 :
264 : dispatch_pgversion!(
265 5 : pg_version,
266 0 : pgv::xlog_utils::generate_wal_segment(segno, system_id, lsn),
267 0 : Err(SerializeError::BadInput)
268 : )
269 5 : }
270 :
271 0 : pub fn generate_pg_control(
272 0 : pg_control_bytes: &[u8],
273 0 : checkpoint_bytes: &[u8],
274 0 : lsn: Lsn,
275 0 : pg_version: u32,
276 0 : ) -> anyhow::Result<(Bytes, u64, bool)> {
277 0 : dispatch_pgversion!(
278 0 : pg_version,
279 0 : pgv::xlog_utils::generate_pg_control(pg_control_bytes, checkpoint_bytes, lsn),
280 0 : anyhow::bail!("Unknown version {}", pg_version)
281 : )
282 0 : }
283 :
284 : // PG timeline is always 1, changing it doesn't have any useful meaning in Neon.
285 : //
286 : // NOTE: this is not to be confused with Neon timelines; different concept!
287 : //
288 : // It's a shaky assumption, that it's always 1. We might import a
289 : // PostgreSQL data directory that has gone through timeline bumps,
290 : // for example. FIXME later.
291 : pub const PG_TLI: u32 = 1;
292 :
293 : // See TransactionIdIsNormal in transam.h
294 0 : pub const fn transaction_id_is_normal(id: TransactionId) -> bool {
295 0 : id > pg_constants::FIRST_NORMAL_TRANSACTION_ID
296 0 : }
297 :
298 : // See TransactionIdPrecedes in transam.c
299 0 : pub const fn transaction_id_precedes(id1: TransactionId, id2: TransactionId) -> bool {
300 0 : /*
301 0 : * If either ID is a permanent XID then we can just do unsigned
302 0 : * comparison. If both are normal, do a modulo-2^32 comparison.
303 0 : */
304 0 :
305 0 : if !(transaction_id_is_normal(id1)) || !transaction_id_is_normal(id2) {
306 0 : return id1 < id2;
307 0 : }
308 0 :
309 0 : let diff = id1.wrapping_sub(id2) as i32;
310 0 : diff < 0
311 0 : }
312 :
313 : // Check if page is not yet initialized (port of Postgres PageIsInit() macro)
314 48 : pub fn page_is_new(pg: &[u8]) -> bool {
315 48 : pg[14] == 0 && pg[15] == 0 // pg_upper == 0
316 48 : }
317 :
318 : // ExtractLSN from page header
319 0 : pub fn page_get_lsn(pg: &[u8]) -> Lsn {
320 0 : Lsn(
321 0 : ((u32::from_le_bytes(pg[0..4].try_into().unwrap()) as u64) << 32)
322 0 : | u32::from_le_bytes(pg[4..8].try_into().unwrap()) as u64,
323 0 : )
324 0 : }
325 :
326 36 : pub fn page_set_lsn(pg: &mut [u8], lsn: Lsn) {
327 36 : pg[0..4].copy_from_slice(&((lsn.0 >> 32) as u32).to_le_bytes());
328 36 : pg[4..8].copy_from_slice(&(lsn.0 as u32).to_le_bytes());
329 36 : }
330 :
331 : // This is port of function with the same name from freespace.c.
332 : // The only difference is that it does not have "level" parameter because XLogRecordPageWithFreeSpace
333 : // always call it with level=FSM_BOTTOM_LEVEL
334 0 : pub fn fsm_logical_to_physical(addr: BlockNumber) -> BlockNumber {
335 0 : let mut leafno = addr;
336 : const FSM_TREE_DEPTH: u32 = if pg_constants::SLOTS_PER_FSM_PAGE >= 1626 {
337 : 3
338 : } else {
339 : 4
340 : };
341 :
342 : /* Count upper level nodes required to address the leaf page */
343 0 : let mut pages: BlockNumber = 0;
344 0 : for _l in 0..FSM_TREE_DEPTH {
345 0 : pages += leafno + 1;
346 0 : leafno /= pg_constants::SLOTS_PER_FSM_PAGE;
347 0 : }
348 : /* Turn the page count into 0-based block number */
349 0 : pages - 1
350 0 : }
351 :
352 : pub mod waldecoder {
353 : use std::num::NonZeroU32;
354 :
355 : use bytes::{Buf, Bytes, BytesMut};
356 : use thiserror::Error;
357 : use utils::lsn::Lsn;
358 :
359 : pub enum State {
360 : WaitingForRecord,
361 : ReassemblingRecord {
362 : recordbuf: BytesMut,
363 : contlen: NonZeroU32,
364 : },
365 : SkippingEverything {
366 : skip_until_lsn: Lsn,
367 : },
368 : }
369 :
370 : pub struct WalStreamDecoder {
371 : pub lsn: Lsn,
372 : pub pg_version: u32,
373 : pub inputbuf: BytesMut,
374 : pub state: State,
375 : }
376 :
377 : #[derive(Error, Debug, Clone)]
378 : #[error("{msg} at {lsn}")]
379 : pub struct WalDecodeError {
380 : pub msg: String,
381 : pub lsn: Lsn,
382 : }
383 :
384 : impl WalStreamDecoder {
385 9801 : pub fn new(lsn: Lsn, pg_version: u32) -> WalStreamDecoder {
386 9801 : WalStreamDecoder {
387 9801 : lsn,
388 9801 : pg_version,
389 9801 : inputbuf: BytesMut::new(),
390 9801 : state: State::WaitingForRecord,
391 9801 : }
392 9801 : }
393 :
394 : // The latest LSN position fed to the decoder.
395 1364 : pub fn available(&self) -> Lsn {
396 1364 : self.lsn + self.inputbuf.remaining() as u64
397 1364 : }
398 :
399 : /// Returns the LSN up to which the WAL decoder has processed.
400 : ///
401 : /// If [`Self::poll_decode`] returned a record, then this will return
402 : /// the end LSN of said record.
403 606 : pub fn lsn(&self) -> Lsn {
404 606 : self.lsn
405 606 : }
406 :
407 967824 : pub fn feed_bytes(&mut self, buf: &[u8]) {
408 967824 : self.inputbuf.extend_from_slice(buf);
409 967824 : }
410 :
411 1284837 : pub fn poll_decode(&mut self) -> Result<Option<(Lsn, Bytes)>, WalDecodeError> {
412 1284837 : dispatch_pgversion!(
413 1284837 : self.pg_version,
414 : {
415 : use pgv::waldecoder_handler::WalStreamDecoderHandler;
416 4167 : self.poll_decode_internal()
417 : },
418 0 : Err(WalDecodeError {
419 0 : msg: format!("Unknown version {}", self.pg_version),
420 0 : lsn: self.lsn,
421 0 : })
422 : )
423 1284837 : }
424 : }
425 : }
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