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 a 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 $version {
21 : pub mod bindings {
22 : // bindgen generates bindings for a lot of stuff we don't need
23 : #![allow(dead_code)]
24 : #![allow(clippy::undocumented_unsafe_blocks)]
25 :
26 : use serde::{Deserialize, Serialize};
27 : include!(concat!(
28 : env!("OUT_DIR"),
29 : "/bindings_",
30 : stringify!($version),
31 : ".rs"
32 : ));
33 :
34 : include!(concat!("pg_constants_", stringify!($version), ".rs"));
35 : }
36 : pub mod controlfile_utils;
37 : pub mod nonrelfile_utils;
38 : pub mod wal_craft_test_export;
39 : pub mod waldecoder_handler;
40 : pub mod xlog_utils;
41 :
42 : pub const PG_MAJORVERSION: &str = stringify!($version);
43 :
44 : // Re-export some symbols from bindings
45 : pub use bindings::DBState_DB_SHUTDOWNED;
46 : pub use bindings::{CheckPoint, ControlFileData, XLogRecord};
47 : }
48 : };
49 : }
50 :
51 : #[macro_export]
52 : macro_rules! for_all_postgres_versions {
53 : ($macro:tt) => {
54 : $macro!(v14);
55 : $macro!(v15);
56 : $macro!(v16);
57 : };
58 : }
59 :
60 : for_all_postgres_versions! { postgres_ffi }
61 :
62 : /// dispatch_pgversion
63 : ///
64 : /// Run a code block in a context where the postgres_ffi bindings for a
65 : /// specific (supported) PostgreSQL version are `use`-ed in scope under the pgv
66 : /// identifier.
67 : /// If the provided pg_version is not supported, we panic!(), unless the
68 : /// optional third argument was provided (in which case that code will provide
69 : /// the default handling instead).
70 : ///
71 : /// Use like
72 : ///
73 : /// dispatch_pgversion!(my_pgversion, { pgv::constants::XLOG_DBASE_CREATE })
74 : /// dispatch_pgversion!(my_pgversion, pgv::constants::XLOG_DBASE_CREATE)
75 : ///
76 : /// Other uses are for macro-internal purposes only and strictly unsupported.
77 : ///
78 : #[macro_export]
79 : macro_rules! dispatch_pgversion {
80 : ($version:expr, $code:expr) => {
81 : dispatch_pgversion!($version, $code, panic!("Unknown PostgreSQL version {}", $version))
82 : };
83 : ($version:expr, $code:expr, $invalid_pgver_handling:expr) => {
84 : dispatch_pgversion!(
85 : $version => $code,
86 : default = $invalid_pgver_handling,
87 : pgversions = [
88 : 14 : v14,
89 : 15 : v15,
90 : 16 : v16,
91 : ]
92 : )
93 : };
94 : ($pgversion:expr => $code:expr,
95 : default = $default:expr,
96 : pgversions = [$($sv:literal : $vsv:ident),+ $(,)?]) => {
97 : match ($pgversion) {
98 : $($sv => {
99 : use $crate::$vsv as pgv;
100 : $code
101 : },)+
102 : _ => {
103 : $default
104 : }
105 : }
106 : };
107 : }
108 :
109 : pub mod pg_constants;
110 : pub mod relfile_utils;
111 :
112 : // Export some widely used datatypes that are unlikely to change across Postgres versions
113 : pub use v14::bindings::{uint32, uint64, Oid};
114 : pub use v14::bindings::{BlockNumber, OffsetNumber};
115 : pub use v14::bindings::{MultiXactId, TransactionId};
116 : pub use v14::bindings::{TimeLineID, TimestampTz, XLogRecPtr, XLogSegNo};
117 :
118 : // Likewise for these, although the assumption that these don't change is a little more iffy.
119 : pub use v14::bindings::{MultiXactOffset, MultiXactStatus};
120 : pub use v14::bindings::{PageHeaderData, XLogRecord};
121 : pub use v14::xlog_utils::{XLOG_SIZE_OF_XLOG_RECORD, XLOG_SIZE_OF_XLOG_SHORT_PHD};
122 :
123 : pub use v14::bindings::{CheckPoint, ControlFileData};
124 :
125 : // from pg_config.h. These can be changed with configure options --with-blocksize=BLOCKSIZE and
126 : // --with-segsize=SEGSIZE, but assume the defaults for now.
127 : pub const BLCKSZ: u16 = 8192;
128 : pub const RELSEG_SIZE: u32 = 1024 * 1024 * 1024 / (BLCKSZ as u32);
129 : pub const XLOG_BLCKSZ: usize = 8192;
130 : pub const WAL_SEGMENT_SIZE: usize = 16 * 1024 * 1024;
131 :
132 : pub const MAX_SEND_SIZE: usize = XLOG_BLCKSZ * 16;
133 :
134 : // Export some version independent functions that are used outside of this mod
135 : pub use v14::xlog_utils::encode_logical_message;
136 : pub use v14::xlog_utils::from_pg_timestamp;
137 : pub use v14::xlog_utils::get_current_timestamp;
138 : pub use v14::xlog_utils::to_pg_timestamp;
139 : pub use v14::xlog_utils::XLogFileName;
140 :
141 : pub use v14::bindings::DBState_DB_SHUTDOWNED;
142 :
143 443991 : pub fn bkpimage_is_compressed(bimg_info: u8, version: u32) -> anyhow::Result<bool> {
144 443991 : dispatch_pgversion!(version, Ok(pgv::bindings::bkpimg_is_compressed(bimg_info)))
145 443991 : }
146 :
147 601 : pub fn generate_wal_segment(
148 601 : segno: u64,
149 601 : system_id: u64,
150 601 : pg_version: u32,
151 601 : lsn: Lsn,
152 601 : ) -> Result<Bytes, SerializeError> {
153 601 : assert_eq!(segno, lsn.segment_number(WAL_SEGMENT_SIZE));
154 :
155 : dispatch_pgversion!(
156 601 : pg_version,
157 601 : pgv::xlog_utils::generate_wal_segment(segno, system_id, lsn),
158 0 : Err(SerializeError::BadInput)
159 : )
160 601 : }
161 :
162 595 : pub fn generate_pg_control(
163 595 : pg_control_bytes: &[u8],
164 595 : checkpoint_bytes: &[u8],
165 595 : lsn: Lsn,
166 595 : pg_version: u32,
167 595 : ) -> anyhow::Result<(Bytes, u64)> {
168 595 : dispatch_pgversion!(
169 595 : pg_version,
170 595 : pgv::xlog_utils::generate_pg_control(pg_control_bytes, checkpoint_bytes, lsn),
171 0 : anyhow::bail!("Unknown version {}", pg_version)
172 : )
173 595 : }
174 :
175 : // PG timeline is always 1, changing it doesn't have any useful meaning in Neon.
176 : //
177 : // NOTE: this is not to be confused with Neon timelines; different concept!
178 : //
179 : // It's a shaky assumption, that it's always 1. We might import a
180 : // PostgreSQL data directory that has gone through timeline bumps,
181 : // for example. FIXME later.
182 : pub const PG_TLI: u32 = 1;
183 :
184 : // See TransactionIdIsNormal in transam.h
185 168 : pub const fn transaction_id_is_normal(id: TransactionId) -> bool {
186 168 : id > pg_constants::FIRST_NORMAL_TRANSACTION_ID
187 168 : }
188 :
189 : // See TransactionIdPrecedes in transam.c
190 84 : pub const fn transaction_id_precedes(id1: TransactionId, id2: TransactionId) -> bool {
191 84 : /*
192 84 : * If either ID is a permanent XID then we can just do unsigned
193 84 : * comparison. If both are normal, do a modulo-2^32 comparison.
194 84 : */
195 84 :
196 84 : if !(transaction_id_is_normal(id1)) || !transaction_id_is_normal(id2) {
197 0 : return id1 < id2;
198 84 : }
199 84 :
200 84 : let diff = id1.wrapping_sub(id2) as i32;
201 84 : diff < 0
202 84 : }
203 :
204 : // Check if page is not yet initialized (port of Postgres PageIsInit() macro)
205 168301 : pub fn page_is_new(pg: &[u8]) -> bool {
206 168301 : pg[14] == 0 && pg[15] == 0 // pg_upper == 0
207 168301 : }
208 :
209 : // ExtractLSN from page header
210 0 : pub fn page_get_lsn(pg: &[u8]) -> Lsn {
211 0 : Lsn(
212 0 : ((u32::from_le_bytes(pg[0..4].try_into().unwrap()) as u64) << 32)
213 0 : | u32::from_le_bytes(pg[4..8].try_into().unwrap()) as u64,
214 0 : )
215 0 : }
216 :
217 161134 : pub fn page_set_lsn(pg: &mut [u8], lsn: Lsn) {
218 161134 : pg[0..4].copy_from_slice(&((lsn.0 >> 32) as u32).to_le_bytes());
219 161134 : pg[4..8].copy_from_slice(&(lsn.0 as u32).to_le_bytes());
220 161134 : }
221 :
222 : // This is port of function with the same name from freespace.c.
223 : // The only difference is that it does not have "level" parameter because XLogRecordPageWithFreeSpace
224 : // always call it with level=FSM_BOTTOM_LEVEL
225 212 : pub fn fsm_logical_to_physical(addr: BlockNumber) -> BlockNumber {
226 212 : let mut leafno = addr;
227 212 : const FSM_TREE_DEPTH: u32 = if pg_constants::SLOTS_PER_FSM_PAGE >= 1626 {
228 212 : 3
229 212 : } else {
230 212 : 4
231 212 : };
232 212 :
233 212 : /* Count upper level nodes required to address the leaf page */
234 212 : let mut pages: BlockNumber = 0;
235 848 : for _l in 0..FSM_TREE_DEPTH {
236 636 : pages += leafno + 1;
237 636 : leafno /= pg_constants::SLOTS_PER_FSM_PAGE;
238 636 : }
239 : /* Turn the page count into 0-based block number */
240 212 : pages - 1
241 212 : }
242 :
243 : pub mod waldecoder {
244 : use bytes::{Buf, Bytes, BytesMut};
245 : use std::num::NonZeroU32;
246 : use thiserror::Error;
247 : use utils::lsn::Lsn;
248 :
249 : pub enum State {
250 : WaitingForRecord,
251 : ReassemblingRecord {
252 : recordbuf: BytesMut,
253 : contlen: NonZeroU32,
254 : },
255 : SkippingEverything {
256 : skip_until_lsn: Lsn,
257 : },
258 : }
259 :
260 : pub struct WalStreamDecoder {
261 : pub lsn: Lsn,
262 : pub pg_version: u32,
263 : pub inputbuf: BytesMut,
264 : pub state: State,
265 : }
266 :
267 112 : #[derive(Error, Debug, Clone)]
268 : #[error("{msg} at {lsn}")]
269 : pub struct WalDecodeError {
270 : pub msg: String,
271 : pub lsn: Lsn,
272 : }
273 :
274 : impl WalStreamDecoder {
275 83907 : pub fn new(lsn: Lsn, pg_version: u32) -> WalStreamDecoder {
276 83907 : WalStreamDecoder {
277 83907 : lsn,
278 83907 : pg_version,
279 83907 : inputbuf: BytesMut::new(),
280 83907 : state: State::WaitingForRecord,
281 83907 : }
282 83907 : }
283 :
284 : // The latest LSN position fed to the decoder.
285 1516952 : pub fn available(&self) -> Lsn {
286 1516952 : self.lsn + self.inputbuf.remaining() as u64
287 1516952 : }
288 :
289 2796261 : pub fn feed_bytes(&mut self, buf: &[u8]) {
290 2796261 : self.inputbuf.extend_from_slice(buf);
291 2796261 : }
292 :
293 159121903 : pub fn poll_decode(&mut self) -> Result<Option<(Lsn, Bytes)>, WalDecodeError> {
294 159121903 : dispatch_pgversion!(
295 159121903 : self.pg_version,
296 : {
297 : use pgv::waldecoder_handler::WalStreamDecoderHandler;
298 159121903 : self.poll_decode_internal()
299 : },
300 0 : Err(WalDecodeError {
301 0 : msg: format!("Unknown version {}", self.pg_version),
302 0 : lsn: self.lsn,
303 0 : })
304 : )
305 159121903 : }
306 : }
307 : }
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