Line data Source code
1 : //! Part of Safekeeper pretending to be Postgres, i.e. handling Postgres
2 : //! protocol commands.
3 :
4 : use anyhow::Context;
5 : use std::str::FromStr;
6 : use std::str::{self};
7 : use std::sync::Arc;
8 : use tokio::io::{AsyncRead, AsyncWrite};
9 : use tracing::{info, info_span, Instrument};
10 :
11 : use crate::auth::check_permission;
12 : use crate::json_ctrl::{handle_json_ctrl, AppendLogicalMessage};
13 :
14 : use crate::metrics::{TrafficMetrics, PG_QUERIES_FINISHED, PG_QUERIES_RECEIVED};
15 : use crate::safekeeper::Term;
16 : use crate::timeline::TimelineError;
17 : use crate::wal_service::ConnectionId;
18 : use crate::{GlobalTimelines, SafeKeeperConf};
19 : use postgres_backend::QueryError;
20 : use postgres_backend::{self, PostgresBackend};
21 : use postgres_ffi::PG_TLI;
22 : use pq_proto::{BeMessage, FeStartupPacket, RowDescriptor, INT4_OID, TEXT_OID};
23 : use regex::Regex;
24 : use utils::auth::{Claims, JwtAuth, Scope};
25 : use utils::{
26 : id::{TenantId, TenantTimelineId, TimelineId},
27 : lsn::Lsn,
28 : };
29 :
30 : /// Safekeeper handler of postgres commands
31 : pub struct SafekeeperPostgresHandler {
32 : pub conf: SafeKeeperConf,
33 : /// assigned application name
34 : pub appname: Option<String>,
35 : pub tenant_id: Option<TenantId>,
36 : pub timeline_id: Option<TimelineId>,
37 : pub ttid: TenantTimelineId,
38 : /// Unique connection id is logged in spans for observability.
39 : pub conn_id: ConnectionId,
40 : /// Auth scope allowed on the connections and public key used to check auth tokens. None if auth is not configured.
41 : auth: Option<(Scope, Arc<JwtAuth>)>,
42 : claims: Option<Claims>,
43 : io_metrics: Option<TrafficMetrics>,
44 : }
45 :
46 : /// Parsed Postgres command.
47 : enum SafekeeperPostgresCommand {
48 : StartWalPush,
49 : StartReplication { start_lsn: Lsn, term: Option<Term> },
50 : IdentifySystem,
51 : TimelineStatus,
52 : JSONCtrl { cmd: AppendLogicalMessage },
53 : }
54 :
55 4484 : fn parse_cmd(cmd: &str) -> anyhow::Result<SafekeeperPostgresCommand> {
56 4484 : if cmd.starts_with("START_WAL_PUSH") {
57 2105 : Ok(SafekeeperPostgresCommand::StartWalPush)
58 2379 : } else if cmd.starts_with("START_REPLICATION") {
59 830 : let re = Regex::new(
60 830 : // We follow postgres START_REPLICATION LOGICAL options to pass term.
61 830 : r"START_REPLICATION(?: SLOT [^ ]+)?(?: PHYSICAL)? ([[:xdigit:]]+/[[:xdigit:]]+)(?: \(term='(\d+)'\))?",
62 830 : )
63 830 : .unwrap();
64 830 : let caps = re
65 830 : .captures(cmd)
66 830 : .context(format!("failed to parse START_REPLICATION command {}", cmd))?;
67 830 : let start_lsn =
68 830 : Lsn::from_str(&caps[1]).context("parse start LSN from START_REPLICATION command")?;
69 830 : let term = if let Some(m) = caps.get(2) {
70 1 : Some(m.as_str().parse::<u64>().context("invalid term")?)
71 : } else {
72 829 : None
73 : };
74 830 : Ok(SafekeeperPostgresCommand::StartReplication { start_lsn, term })
75 1549 : } else if cmd.starts_with("IDENTIFY_SYSTEM") {
76 776 : Ok(SafekeeperPostgresCommand::IdentifySystem)
77 773 : } else if cmd.starts_with("TIMELINE_STATUS") {
78 770 : Ok(SafekeeperPostgresCommand::TimelineStatus)
79 3 : } else if cmd.starts_with("JSON_CTRL") {
80 3 : let cmd = cmd.strip_prefix("JSON_CTRL").context("invalid prefix")?;
81 : Ok(SafekeeperPostgresCommand::JSONCtrl {
82 3 : cmd: serde_json::from_str(cmd)?,
83 : })
84 : } else {
85 0 : anyhow::bail!("unsupported command {cmd}");
86 : }
87 4484 : }
88 :
89 4484 : fn cmd_to_string(cmd: &SafekeeperPostgresCommand) -> &str {
90 4484 : match cmd {
91 2105 : SafekeeperPostgresCommand::StartWalPush => "START_WAL_PUSH",
92 830 : SafekeeperPostgresCommand::StartReplication { .. } => "START_REPLICATION",
93 770 : SafekeeperPostgresCommand::TimelineStatus => "TIMELINE_STATUS",
94 776 : SafekeeperPostgresCommand::IdentifySystem => "IDENTIFY_SYSTEM",
95 3 : SafekeeperPostgresCommand::JSONCtrl { .. } => "JSON_CTRL",
96 : }
97 4484 : }
98 :
99 : #[async_trait::async_trait]
100 : impl<IO: AsyncRead + AsyncWrite + Unpin + Send> postgres_backend::Handler<IO>
101 : for SafekeeperPostgresHandler
102 : {
103 : // tenant_id and timeline_id are passed in connection string params
104 : fn startup(
105 : &mut self,
106 : _pgb: &mut PostgresBackend<IO>,
107 : sm: &FeStartupPacket,
108 : ) -> Result<(), QueryError> {
109 3727 : if let FeStartupPacket::StartupMessage { params, .. } = sm {
110 3727 : if let Some(options) = params.options_raw() {
111 14922 : for opt in options {
112 : // FIXME `ztenantid` and `ztimelineid` left for compatibility during deploy,
113 : // remove these after the PR gets deployed:
114 : // https://github.com/neondatabase/neon/pull/2433#discussion_r970005064
115 11195 : match opt.split_once('=') {
116 7474 : Some(("ztenantid", value)) | Some(("tenant_id", value)) => {
117 3727 : self.tenant_id = Some(value.parse().with_context(|| {
118 0 : format!("Failed to parse {value} as tenant id")
119 3727 : })?);
120 : }
121 3747 : Some(("ztimelineid", value)) | Some(("timeline_id", value)) => {
122 3727 : self.timeline_id = Some(value.parse().with_context(|| {
123 0 : format!("Failed to parse {value} as timeline id")
124 3727 : })?);
125 : }
126 20 : Some(("availability_zone", client_az)) => {
127 4 : if let Some(metrics) = self.io_metrics.as_ref() {
128 4 : metrics.set_client_az(client_az)
129 0 : }
130 : }
131 3737 : _ => continue,
132 : }
133 : }
134 0 : }
135 :
136 3727 : if let Some(app_name) = params.get("application_name") {
137 829 : self.appname = Some(app_name.to_owned());
138 829 : if let Some(metrics) = self.io_metrics.as_ref() {
139 829 : metrics.set_app_name(app_name)
140 0 : }
141 2898 : }
142 :
143 3727 : Ok(())
144 : } else {
145 0 : Err(QueryError::Other(anyhow::anyhow!(
146 0 : "Safekeeper received unexpected initial message: {sm:?}"
147 0 : )))
148 : }
149 3727 : }
150 :
151 131 : fn check_auth_jwt(
152 131 : &mut self,
153 131 : _pgb: &mut PostgresBackend<IO>,
154 131 : jwt_response: &[u8],
155 131 : ) -> Result<(), QueryError> {
156 131 : // this unwrap is never triggered, because check_auth_jwt only called when auth_type is NeonJWT
157 131 : // which requires auth to be present
158 131 : let (allowed_auth_scope, auth) = self
159 131 : .auth
160 131 : .as_ref()
161 131 : .expect("auth_type is configured but .auth of handler is missing");
162 131 : let data =
163 131 : auth.decode(str::from_utf8(jwt_response).context("jwt response is not UTF-8")?)?;
164 :
165 : // The handler might be configured to allow only tenant scope tokens.
166 131 : if matches!(allowed_auth_scope, Scope::Tenant)
167 104 : && !matches!(data.claims.scope, Scope::Tenant)
168 : {
169 1 : return Err(QueryError::Other(anyhow::anyhow!(
170 1 : "passed JWT token is for full access, but only tenant scope is allowed"
171 1 : )));
172 130 : }
173 :
174 130 : if matches!(data.claims.scope, Scope::Tenant) && data.claims.tenant_id.is_none() {
175 0 : return Err(QueryError::Other(anyhow::anyhow!(
176 0 : "jwt token scope is Tenant, but tenant id is missing"
177 0 : )));
178 130 : }
179 130 :
180 130 : info!(
181 130 : "jwt auth succeeded for scope: {:#?} by tenant id: {:?}",
182 130 : data.claims.scope, data.claims.tenant_id,
183 130 : );
184 :
185 130 : self.claims = Some(data.claims);
186 130 : Ok(())
187 131 : }
188 :
189 4495 : async fn process_query(
190 4495 : &mut self,
191 4495 : pgb: &mut PostgresBackend<IO>,
192 4495 : query_string: &str,
193 4495 : ) -> Result<(), QueryError> {
194 4495 : if query_string
195 4495 : .to_ascii_lowercase()
196 4495 : .starts_with("set datestyle to ")
197 : {
198 : // important for debug because psycopg2 executes "SET datestyle TO 'ISO'" on connect
199 11 : pgb.write_message_noflush(&BeMessage::CommandComplete(b"SELECT 1"))?;
200 11 : return Ok(());
201 4484 : }
202 :
203 4484 : let cmd = parse_cmd(query_string)?;
204 4484 : let cmd_str = cmd_to_string(&cmd);
205 4484 :
206 4484 : PG_QUERIES_RECEIVED.with_label_values(&[cmd_str]).inc();
207 4484 : scopeguard::defer! {
208 4114 : PG_QUERIES_FINISHED.with_label_values(&[cmd_str]).inc();
209 4114 : }
210 4484 :
211 4484 : info!(
212 4484 : "got query {:?} in timeline {:?}",
213 4484 : query_string, self.timeline_id
214 4484 : );
215 :
216 4484 : let tenant_id = self.tenant_id.context("tenantid is required")?;
217 4484 : let timeline_id = self.timeline_id.context("timelineid is required")?;
218 4484 : self.check_permission(Some(tenant_id))?;
219 4482 : self.ttid = TenantTimelineId::new(tenant_id, timeline_id);
220 4482 : let span_ttid = self.ttid; // satisfy borrow checker
221 4482 :
222 4482 : match cmd {
223 : SafekeeperPostgresCommand::StartWalPush => {
224 2105 : self.handle_start_wal_push(pgb)
225 2105 : .instrument(info_span!("WAL receiver", ttid = %span_ttid))
226 4548274 : .await
227 : }
228 830 : SafekeeperPostgresCommand::StartReplication { start_lsn, term } => {
229 830 : self.handle_start_replication(pgb, start_lsn, term)
230 830 : .instrument(info_span!("WAL sender", ttid = %span_ttid))
231 2769161 : .await
232 : }
233 774 : SafekeeperPostgresCommand::IdentifySystem => self.handle_identify_system(pgb).await,
234 770 : SafekeeperPostgresCommand::TimelineStatus => self.handle_timeline_status(pgb).await,
235 3 : SafekeeperPostgresCommand::JSONCtrl { ref cmd } => {
236 9782 : handle_json_ctrl(self, pgb, cmd).await
237 : }
238 : }
239 8620 : }
240 : }
241 :
242 : impl SafekeeperPostgresHandler {
243 3727 : pub fn new(
244 3727 : conf: SafeKeeperConf,
245 3727 : conn_id: u32,
246 3727 : io_metrics: Option<TrafficMetrics>,
247 3727 : auth: Option<(Scope, Arc<JwtAuth>)>,
248 3727 : ) -> Self {
249 3727 : SafekeeperPostgresHandler {
250 3727 : conf,
251 3727 : appname: None,
252 3727 : tenant_id: None,
253 3727 : timeline_id: None,
254 3727 : ttid: TenantTimelineId::empty(),
255 3727 : conn_id,
256 3727 : claims: None,
257 3727 : auth,
258 3727 : io_metrics,
259 3727 : }
260 3727 : }
261 :
262 : // when accessing management api supply None as an argument
263 : // when using to authorize tenant pass corresponding tenant id
264 4484 : fn check_permission(&self, tenant_id: Option<TenantId>) -> anyhow::Result<()> {
265 4484 : if self.auth.is_none() {
266 : // auth is set to Trust, nothing to check so just return ok
267 4334 : return Ok(());
268 150 : }
269 150 : // auth is some, just checked above, when auth is some
270 150 : // then claims are always present because of checks during connection init
271 150 : // so this expect won't trigger
272 150 : let claims = self
273 150 : .claims
274 150 : .as_ref()
275 150 : .expect("claims presence already checked");
276 150 : check_permission(claims, tenant_id)
277 4484 : }
278 :
279 770 : async fn handle_timeline_status<IO: AsyncRead + AsyncWrite + Unpin>(
280 770 : &mut self,
281 770 : pgb: &mut PostgresBackend<IO>,
282 770 : ) -> Result<(), QueryError> {
283 : // Get timeline, handling "not found" error
284 770 : let tli = match GlobalTimelines::get(self.ttid) {
285 260 : Ok(tli) => Ok(Some(tli)),
286 510 : Err(TimelineError::NotFound(_)) => Ok(None),
287 0 : Err(e) => Err(QueryError::Other(e.into())),
288 0 : }?;
289 :
290 : // Write row description
291 770 : pgb.write_message_noflush(&BeMessage::RowDescription(&[
292 770 : RowDescriptor::text_col(b"flush_lsn"),
293 770 : RowDescriptor::text_col(b"commit_lsn"),
294 770 : ]))?;
295 :
296 : // Write row if timeline exists
297 770 : if let Some(tli) = tli {
298 260 : let (inmem, _state) = tli.get_state().await;
299 260 : let flush_lsn = tli.get_flush_lsn().await;
300 260 : let commit_lsn = inmem.commit_lsn;
301 260 : pgb.write_message_noflush(&BeMessage::DataRow(&[
302 260 : Some(flush_lsn.to_string().as_bytes()),
303 260 : Some(commit_lsn.to_string().as_bytes()),
304 260 : ]))?;
305 510 : }
306 :
307 770 : pgb.write_message_noflush(&BeMessage::CommandComplete(b"TIMELINE_STATUS"))?;
308 770 : Ok(())
309 770 : }
310 :
311 : ///
312 : /// Handle IDENTIFY_SYSTEM replication command
313 : ///
314 774 : async fn handle_identify_system<IO: AsyncRead + AsyncWrite + Unpin>(
315 774 : &mut self,
316 774 : pgb: &mut PostgresBackend<IO>,
317 774 : ) -> Result<(), QueryError> {
318 774 : let tli = GlobalTimelines::get(self.ttid).map_err(|e| QueryError::Other(e.into()))?;
319 :
320 774 : let lsn = if self.is_walproposer_recovery() {
321 : // walproposer should get all local WAL until flush_lsn
322 0 : tli.get_flush_lsn().await
323 : } else {
324 : // other clients shouldn't get any uncommitted WAL
325 774 : tli.get_state().await.0.commit_lsn
326 : }
327 774 : .to_string();
328 :
329 774 : let sysid = tli.get_state().await.1.server.system_id.to_string();
330 774 : let lsn_bytes = lsn.as_bytes();
331 774 : let tli = PG_TLI.to_string();
332 774 : let tli_bytes = tli.as_bytes();
333 774 : let sysid_bytes = sysid.as_bytes();
334 774 :
335 774 : pgb.write_message_noflush(&BeMessage::RowDescription(&[
336 774 : RowDescriptor {
337 774 : name: b"systemid",
338 774 : typoid: TEXT_OID,
339 774 : typlen: -1,
340 774 : ..Default::default()
341 774 : },
342 774 : RowDescriptor {
343 774 : name: b"timeline",
344 774 : typoid: INT4_OID,
345 774 : typlen: 4,
346 774 : ..Default::default()
347 774 : },
348 774 : RowDescriptor {
349 774 : name: b"xlogpos",
350 774 : typoid: TEXT_OID,
351 774 : typlen: -1,
352 774 : ..Default::default()
353 774 : },
354 774 : RowDescriptor {
355 774 : name: b"dbname",
356 774 : typoid: TEXT_OID,
357 774 : typlen: -1,
358 774 : ..Default::default()
359 774 : },
360 774 : ]))?
361 774 : .write_message_noflush(&BeMessage::DataRow(&[
362 774 : Some(sysid_bytes),
363 774 : Some(tli_bytes),
364 774 : Some(lsn_bytes),
365 774 : None,
366 774 : ]))?
367 774 : .write_message_noflush(&BeMessage::CommandComplete(b"IDENTIFY_SYSTEM"))?;
368 774 : Ok(())
369 774 : }
370 :
371 : /// Returns true if current connection is a replication connection, originating
372 : /// from a walproposer recovery function. This connection gets a special handling:
373 : /// safekeeper must stream all local WAL till the flush_lsn, whether committed or not.
374 1604 : pub fn is_walproposer_recovery(&self) -> bool {
375 1604 : self.appname == Some("wal_proposer_recovery".to_string())
376 1604 : }
377 : }
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