Line data Source code
1 : //! A C-Rust shim: defines implementation of C walproposer API, assuming wp
2 : //! callback_data stores Box to some Rust implementation.
3 :
4 : #![allow(dead_code)]
5 :
6 : use std::ffi::CStr;
7 : use std::ffi::CString;
8 :
9 : use crate::bindings::uint32;
10 : use crate::bindings::walproposer_api;
11 : use crate::bindings::NeonWALReadResult;
12 : use crate::bindings::PGAsyncReadResult;
13 : use crate::bindings::PGAsyncWriteResult;
14 : use crate::bindings::Safekeeper;
15 : use crate::bindings::Size;
16 : use crate::bindings::StringInfoData;
17 : use crate::bindings::TimestampTz;
18 : use crate::bindings::WalProposer;
19 : use crate::bindings::WalProposerConnStatusType;
20 : use crate::bindings::WalProposerConnectPollStatusType;
21 : use crate::bindings::WalProposerExecStatusType;
22 : use crate::bindings::WalproposerShmemState;
23 : use crate::bindings::XLogRecPtr;
24 : use crate::walproposer::ApiImpl;
25 : use crate::walproposer::StreamingCallback;
26 : use crate::walproposer::WaitResult;
27 :
28 1465 : extern "C" fn get_shmem_state(wp: *mut WalProposer) -> *mut WalproposerShmemState {
29 1465 : unsafe {
30 1465 : let callback_data = (*(*wp).config).callback_data;
31 1465 : let api = callback_data as *mut Box<dyn ApiImpl>;
32 1465 : (*api).get_shmem_state()
33 1465 : }
34 1465 : }
35 :
36 1405 : extern "C" fn start_streaming(wp: *mut WalProposer, startpos: XLogRecPtr) {
37 1405 : unsafe {
38 1405 : let callback_data = (*(*wp).config).callback_data;
39 1405 : let api = callback_data as *mut Box<dyn ApiImpl>;
40 1405 : let callback = StreamingCallback::new(wp);
41 1405 : (*api).start_streaming(startpos, &callback);
42 1405 : }
43 1405 : }
44 :
45 854 : extern "C" fn get_flush_rec_ptr(wp: *mut WalProposer) -> XLogRecPtr {
46 854 : unsafe {
47 854 : let callback_data = (*(*wp).config).callback_data;
48 854 : let api = callback_data as *mut Box<dyn ApiImpl>;
49 854 : (*api).get_flush_rec_ptr()
50 854 : }
51 854 : }
52 :
53 2531647 : extern "C" fn get_current_timestamp(wp: *mut WalProposer) -> TimestampTz {
54 2531647 : unsafe {
55 2531647 : let callback_data = (*(*wp).config).callback_data;
56 2531647 : let api = callback_data as *mut Box<dyn ApiImpl>;
57 2531647 : (*api).get_current_timestamp()
58 2531647 : }
59 2531647 : }
60 :
61 87563 : extern "C" fn conn_error_message(sk: *mut Safekeeper) -> *mut ::std::os::raw::c_char {
62 87563 : unsafe {
63 87563 : let callback_data = (*(*(*sk).wp).config).callback_data;
64 87563 : let api = callback_data as *mut Box<dyn ApiImpl>;
65 87563 : let msg = (*api).conn_error_message(&mut (*sk));
66 87563 : let msg = CString::new(msg).unwrap();
67 87563 : // TODO: fix leaking error message
68 87563 : msg.into_raw()
69 87563 : }
70 87563 : }
71 :
72 268149 : extern "C" fn conn_status(sk: *mut Safekeeper) -> WalProposerConnStatusType {
73 268149 : unsafe {
74 268149 : let callback_data = (*(*(*sk).wp).config).callback_data;
75 268149 : let api = callback_data as *mut Box<dyn ApiImpl>;
76 268149 : (*api).conn_status(&mut (*sk))
77 268149 : }
78 268149 : }
79 :
80 268149 : extern "C" fn conn_connect_start(sk: *mut Safekeeper) {
81 268149 : unsafe {
82 268149 : let callback_data = (*(*(*sk).wp).config).callback_data;
83 268149 : let api = callback_data as *mut Box<dyn ApiImpl>;
84 268149 : (*api).conn_connect_start(&mut (*sk))
85 268149 : }
86 268149 : }
87 :
88 240975 : extern "C" fn conn_connect_poll(sk: *mut Safekeeper) -> WalProposerConnectPollStatusType {
89 240975 : unsafe {
90 240975 : let callback_data = (*(*(*sk).wp).config).callback_data;
91 240975 : let api = callback_data as *mut Box<dyn ApiImpl>;
92 240975 : (*api).conn_connect_poll(&mut (*sk))
93 240975 : }
94 240975 : }
95 :
96 240975 : extern "C" fn conn_send_query(sk: *mut Safekeeper, query: *mut ::std::os::raw::c_char) -> bool {
97 240975 : let query = unsafe { CStr::from_ptr(query) };
98 240975 : let query = query.to_str().unwrap();
99 240975 :
100 240975 : unsafe {
101 240975 : let callback_data = (*(*(*sk).wp).config).callback_data;
102 240975 : let api = callback_data as *mut Box<dyn ApiImpl>;
103 240975 : (*api).conn_send_query(&mut (*sk), query)
104 240975 : }
105 240975 : }
106 :
107 240975 : extern "C" fn conn_get_query_result(sk: *mut Safekeeper) -> WalProposerExecStatusType {
108 240975 : unsafe {
109 240975 : let callback_data = (*(*(*sk).wp).config).callback_data;
110 240975 : let api = callback_data as *mut Box<dyn ApiImpl>;
111 240975 : (*api).conn_get_query_result(&mut (*sk))
112 240975 : }
113 240975 : }
114 :
115 0 : extern "C" fn conn_flush(sk: *mut Safekeeper) -> ::std::os::raw::c_int {
116 0 : unsafe {
117 0 : let callback_data = (*(*(*sk).wp).config).callback_data;
118 0 : let api = callback_data as *mut Box<dyn ApiImpl>;
119 0 : (*api).conn_flush(&mut (*sk))
120 0 : }
121 0 : }
122 :
123 89695 : extern "C" fn conn_finish(sk: *mut Safekeeper) {
124 89695 : unsafe {
125 89695 : let callback_data = (*(*(*sk).wp).config).callback_data;
126 89695 : let api = callback_data as *mut Box<dyn ApiImpl>;
127 89695 : (*api).conn_finish(&mut (*sk))
128 89695 : }
129 89695 : }
130 :
131 142596 : extern "C" fn conn_async_read(
132 142596 : sk: *mut Safekeeper,
133 142596 : buf: *mut *mut ::std::os::raw::c_char,
134 142596 : amount: *mut ::std::os::raw::c_int,
135 142596 : ) -> PGAsyncReadResult {
136 142596 : unsafe {
137 142596 : let callback_data = (*(*(*sk).wp).config).callback_data;
138 142596 : let api = callback_data as *mut Box<dyn ApiImpl>;
139 142596 :
140 142596 : // This function has guarantee that returned buf will be valid until
141 142596 : // the next call. So we can store a Vec in each Safekeeper and reuse
142 142596 : // it on the next call.
143 142596 : let mut inbuf = take_vec_u8(&mut (*sk).inbuf).unwrap_or_default();
144 142596 : inbuf.clear();
145 142596 :
146 142596 : let result = (*api).conn_async_read(&mut (*sk), &mut inbuf);
147 142596 :
148 142596 : // Put a Vec back to sk->inbuf and return data ptr.
149 142596 : *amount = inbuf.len() as i32;
150 142596 : *buf = store_vec_u8(&mut (*sk).inbuf, inbuf);
151 142596 :
152 142596 : result
153 142596 : }
154 142596 : }
155 :
156 37645 : extern "C" fn conn_async_write(
157 37645 : sk: *mut Safekeeper,
158 37645 : buf: *const ::std::os::raw::c_void,
159 37645 : size: usize,
160 37645 : ) -> PGAsyncWriteResult {
161 37645 : unsafe {
162 37645 : let buf = std::slice::from_raw_parts(buf as *const u8, size);
163 37645 : let callback_data = (*(*(*sk).wp).config).callback_data;
164 37645 : let api = callback_data as *mut Box<dyn ApiImpl>;
165 37645 : (*api).conn_async_write(&mut (*sk), buf)
166 37645 : }
167 37645 : }
168 :
169 271360 : extern "C" fn conn_blocking_write(
170 271360 : sk: *mut Safekeeper,
171 271360 : buf: *const ::std::os::raw::c_void,
172 271360 : size: usize,
173 271360 : ) -> bool {
174 271360 : unsafe {
175 271360 : let buf = std::slice::from_raw_parts(buf as *const u8, size);
176 271360 : let callback_data = (*(*(*sk).wp).config).callback_data;
177 271360 : let api = callback_data as *mut Box<dyn ApiImpl>;
178 271360 : (*api).conn_blocking_write(&mut (*sk), buf)
179 271360 : }
180 271360 : }
181 :
182 6115 : extern "C" fn recovery_download(wp: *mut WalProposer, sk: *mut Safekeeper) -> bool {
183 6115 : unsafe {
184 6115 : let callback_data = (*(*(*sk).wp).config).callback_data;
185 6115 : let api = callback_data as *mut Box<dyn ApiImpl>;
186 6115 :
187 6115 : // currently `recovery_download` is always called right after election
188 6115 : (*api).after_election(&mut (*wp));
189 6115 :
190 6115 : (*api).recovery_download(&mut (*wp), &mut (*sk))
191 6115 : }
192 6115 : }
193 :
194 8462 : extern "C" fn wal_reader_allocate(sk: *mut Safekeeper) {
195 8462 : unsafe {
196 8462 : let callback_data = (*(*(*sk).wp).config).callback_data;
197 8462 : let api = callback_data as *mut Box<dyn ApiImpl>;
198 8462 : (*api).wal_reader_allocate(&mut (*sk));
199 8462 : }
200 8462 : }
201 :
202 : #[allow(clippy::unnecessary_cast)]
203 29183 : extern "C" fn wal_read(
204 29183 : sk: *mut Safekeeper,
205 29183 : buf: *mut ::std::os::raw::c_char,
206 29183 : startptr: XLogRecPtr,
207 29183 : count: Size,
208 29183 : _errmsg: *mut *mut ::std::os::raw::c_char,
209 29183 : ) -> NeonWALReadResult {
210 29183 : unsafe {
211 29183 : let buf = std::slice::from_raw_parts_mut(buf as *mut u8, count);
212 29183 : let callback_data = (*(*(*sk).wp).config).callback_data;
213 29183 : let api = callback_data as *mut Box<dyn ApiImpl>;
214 29183 : // TODO: errmsg is not forwarded
215 29183 : (*api).wal_read(&mut (*sk), buf, startptr)
216 29183 : }
217 29183 : }
218 :
219 125011 : extern "C" fn wal_reader_events(sk: *mut Safekeeper) -> uint32 {
220 125011 : unsafe {
221 125011 : let callback_data = (*(*(*sk).wp).config).callback_data;
222 125011 : let api = callback_data as *mut Box<dyn ApiImpl>;
223 125011 : (*api).wal_reader_events(&mut (*sk))
224 125011 : }
225 125011 : }
226 :
227 72542 : extern "C" fn init_event_set(wp: *mut WalProposer) {
228 72542 : unsafe {
229 72542 : let callback_data = (*(*wp).config).callback_data;
230 72542 : let api = callback_data as *mut Box<dyn ApiImpl>;
231 72542 : (*api).init_event_set(&mut (*wp));
232 72542 : }
233 72542 : }
234 :
235 534297 : extern "C" fn update_event_set(sk: *mut Safekeeper, events: uint32) {
236 534297 : unsafe {
237 534297 : let callback_data = (*(*(*sk).wp).config).callback_data;
238 534297 : let api = callback_data as *mut Box<dyn ApiImpl>;
239 534297 : (*api).update_event_set(&mut (*sk), events);
240 534297 : }
241 534297 : }
242 :
243 43586 : extern "C" fn active_state_update_event_set(sk: *mut Safekeeper) {
244 43586 : unsafe {
245 43586 : let callback_data = (*(*(*sk).wp).config).callback_data;
246 43586 : let api = callback_data as *mut Box<dyn ApiImpl>;
247 43586 : (*api).active_state_update_event_set(&mut (*sk));
248 43586 : }
249 43586 : }
250 :
251 481950 : extern "C" fn add_safekeeper_event_set(sk: *mut Safekeeper, events: uint32) {
252 481950 : unsafe {
253 481950 : let callback_data = (*(*(*sk).wp).config).callback_data;
254 481950 : let api = callback_data as *mut Box<dyn ApiImpl>;
255 481950 : (*api).add_safekeeper_event_set(&mut (*sk), events);
256 481950 : }
257 481950 : }
258 :
259 303496 : extern "C" fn rm_safekeeper_event_set(sk: *mut Safekeeper) {
260 303496 : unsafe {
261 303496 : let callback_data = (*(*(*sk).wp).config).callback_data;
262 303496 : let api = callback_data as *mut Box<dyn ApiImpl>;
263 303496 : (*api).rm_safekeeper_event_set(&mut (*sk));
264 303496 : }
265 303496 : }
266 :
267 705017 : extern "C" fn wait_event_set(
268 705017 : wp: *mut WalProposer,
269 705017 : timeout: ::std::os::raw::c_long,
270 705017 : event_sk: *mut *mut Safekeeper,
271 705017 : events: *mut uint32,
272 705017 : ) -> ::std::os::raw::c_int {
273 705017 : unsafe {
274 705017 : let callback_data = (*(*wp).config).callback_data;
275 705017 : let api = callback_data as *mut Box<dyn ApiImpl>;
276 705017 : let result = (*api).wait_event_set(&mut (*wp), timeout);
277 705017 : match result {
278 : WaitResult::Latch => {
279 71593 : *event_sk = std::ptr::null_mut();
280 71593 : *events = crate::bindings::WL_LATCH_SET;
281 71593 : 1
282 : }
283 : WaitResult::Timeout => {
284 21694 : *event_sk = std::ptr::null_mut();
285 21694 : // WaitEventSetWait returns 0 for timeout.
286 21694 : *events = 0;
287 21694 : 0
288 : }
289 611730 : WaitResult::Network(sk, event_mask) => {
290 611730 : *event_sk = sk;
291 611730 : *events = event_mask;
292 611730 : 1
293 : }
294 : }
295 : }
296 705017 : }
297 :
298 72542 : extern "C" fn strong_random(
299 72542 : wp: *mut WalProposer,
300 72542 : buf: *mut ::std::os::raw::c_void,
301 72542 : len: usize,
302 72542 : ) -> bool {
303 72542 : unsafe {
304 72542 : let buf = std::slice::from_raw_parts_mut(buf as *mut u8, len);
305 72542 : let callback_data = (*(*wp).config).callback_data;
306 72542 : let api = callback_data as *mut Box<dyn ApiImpl>;
307 72542 : (*api).strong_random(buf)
308 72542 : }
309 72542 : }
310 :
311 2401 : extern "C" fn get_redo_start_lsn(wp: *mut WalProposer) -> XLogRecPtr {
312 2401 : unsafe {
313 2401 : let callback_data = (*(*wp).config).callback_data;
314 2401 : let api = callback_data as *mut Box<dyn ApiImpl>;
315 2401 : (*api).get_redo_start_lsn()
316 2401 : }
317 2401 : }
318 :
319 2909 : extern "C" fn finish_sync_safekeepers(wp: *mut WalProposer, lsn: XLogRecPtr) {
320 2909 : unsafe {
321 2909 : let callback_data = (*(*wp).config).callback_data;
322 2909 : let api = callback_data as *mut Box<dyn ApiImpl>;
323 2909 : (*api).finish_sync_safekeepers(lsn)
324 2909 : }
325 2909 : }
326 :
327 15465 : extern "C" fn process_safekeeper_feedback(wp: *mut WalProposer, sk: *mut Safekeeper) {
328 15465 : unsafe {
329 15465 : let callback_data = (*(*wp).config).callback_data;
330 15465 : let api = callback_data as *mut Box<dyn ApiImpl>;
331 15465 : (*api).process_safekeeper_feedback(&mut (*wp), &mut (*sk));
332 15465 : }
333 15465 : }
334 :
335 727627 : extern "C" fn log_internal(
336 727627 : wp: *mut WalProposer,
337 727627 : level: ::std::os::raw::c_int,
338 727627 : line: *const ::std::os::raw::c_char,
339 727627 : ) {
340 727627 : unsafe {
341 727627 : let callback_data = (*(*wp).config).callback_data;
342 727627 : let api = callback_data as *mut Box<dyn ApiImpl>;
343 727627 : let line = CStr::from_ptr(line);
344 727627 : let line = line.to_str().unwrap();
345 727627 : (*api).log_internal(&mut (*wp), Level::from(level as u32), line)
346 727627 : }
347 727627 : }
348 :
349 : #[derive(Debug, PartialEq)]
350 : pub enum Level {
351 : Debug5,
352 : Debug4,
353 : Debug3,
354 : Debug2,
355 : Debug1,
356 : Log,
357 : Info,
358 : Notice,
359 : Warning,
360 : Error,
361 : Fatal,
362 : Panic,
363 : WPEvent,
364 : }
365 :
366 : impl Level {
367 727627 : pub fn from(elevel: u32) -> Level {
368 727627 : use crate::bindings::*;
369 727627 :
370 727627 : match elevel {
371 29183 : DEBUG5 => Level::Debug5,
372 0 : DEBUG4 => Level::Debug4,
373 0 : DEBUG3 => Level::Debug3,
374 15465 : DEBUG2 => Level::Debug2,
375 0 : DEBUG1 => Level::Debug1,
376 592632 : LOG => Level::Log,
377 0 : INFO => Level::Info,
378 0 : NOTICE => Level::Notice,
379 89695 : WARNING => Level::Warning,
380 0 : ERROR => Level::Error,
381 622 : FATAL => Level::Fatal,
382 30 : PANIC => Level::Panic,
383 0 : WPEVENT => Level::WPEvent,
384 0 : _ => panic!("unknown log level {}", elevel),
385 : }
386 727627 : }
387 : }
388 :
389 72542 : pub(crate) fn create_api() -> walproposer_api {
390 72542 : walproposer_api {
391 72542 : get_shmem_state: Some(get_shmem_state),
392 72542 : start_streaming: Some(start_streaming),
393 72542 : get_flush_rec_ptr: Some(get_flush_rec_ptr),
394 72542 : get_current_timestamp: Some(get_current_timestamp),
395 72542 : conn_error_message: Some(conn_error_message),
396 72542 : conn_status: Some(conn_status),
397 72542 : conn_connect_start: Some(conn_connect_start),
398 72542 : conn_connect_poll: Some(conn_connect_poll),
399 72542 : conn_send_query: Some(conn_send_query),
400 72542 : conn_get_query_result: Some(conn_get_query_result),
401 72542 : conn_flush: Some(conn_flush),
402 72542 : conn_finish: Some(conn_finish),
403 72542 : conn_async_read: Some(conn_async_read),
404 72542 : conn_async_write: Some(conn_async_write),
405 72542 : conn_blocking_write: Some(conn_blocking_write),
406 72542 : recovery_download: Some(recovery_download),
407 72542 : wal_reader_allocate: Some(wal_reader_allocate),
408 72542 : wal_read: Some(wal_read),
409 72542 : wal_reader_events: Some(wal_reader_events),
410 72542 : init_event_set: Some(init_event_set),
411 72542 : update_event_set: Some(update_event_set),
412 72542 : active_state_update_event_set: Some(active_state_update_event_set),
413 72542 : add_safekeeper_event_set: Some(add_safekeeper_event_set),
414 72542 : rm_safekeeper_event_set: Some(rm_safekeeper_event_set),
415 72542 : wait_event_set: Some(wait_event_set),
416 72542 : strong_random: Some(strong_random),
417 72542 : get_redo_start_lsn: Some(get_redo_start_lsn),
418 72542 : finish_sync_safekeepers: Some(finish_sync_safekeepers),
419 72542 : process_safekeeper_feedback: Some(process_safekeeper_feedback),
420 72542 : log_internal: Some(log_internal),
421 72542 : }
422 72542 : }
423 :
424 : impl std::fmt::Display for Level {
425 2292 : fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
426 2292 : write!(f, "{:?}", self)
427 2292 : }
428 : }
429 :
430 : /// Take ownership of `Vec<u8>` from StringInfoData.
431 : #[allow(clippy::unnecessary_cast)]
432 360206 : pub(crate) fn take_vec_u8(pg: &mut StringInfoData) -> Option<Vec<u8>> {
433 360206 : if pg.data.is_null() {
434 217620 : return None;
435 142586 : }
436 142586 :
437 142586 : let ptr = pg.data as *mut u8;
438 142586 : let length = pg.len as usize;
439 142586 : let capacity = pg.maxlen as usize;
440 142586 :
441 142586 : pg.data = std::ptr::null_mut();
442 142586 : pg.len = 0;
443 142586 : pg.maxlen = 0;
444 142586 :
445 142586 : unsafe { Some(Vec::from_raw_parts(ptr, length, capacity)) }
446 360206 : }
447 :
448 : /// Store `Vec<u8>` in StringInfoData.
449 142596 : fn store_vec_u8(pg: &mut StringInfoData, vec: Vec<u8>) -> *mut ::std::os::raw::c_char {
450 142596 : let ptr = vec.as_ptr() as *mut ::std::os::raw::c_char;
451 142596 : let length = vec.len();
452 142596 : let capacity = vec.capacity();
453 142596 :
454 142596 : assert!(pg.data.is_null());
455 :
456 142596 : pg.data = ptr;
457 142596 : pg.len = length as i32;
458 142596 : pg.maxlen = capacity as i32;
459 142596 :
460 142596 : std::mem::forget(vec);
461 142596 :
462 142596 : ptr
463 142596 : }
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