microcosm.blue
Server tools to backfill, tail, mirror, and verify PLC logs
keep track of pg connection tasks
bad-example.com
+41
-59
src/plc_pg.rs
+41
-59
src/plc_pg.rs
···
4
4
use std::path::PathBuf;
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5
use std::pin::pin;
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6
use std::time::Instant;
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-
use tokio::sync::{mpsc, oneshot};
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+
use tokio::{
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+
task::{spawn, JoinHandle},
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+
sync::{mpsc, oneshot},
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+
};
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use tokio_postgres::{
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Client, Error as PgError, NoTls,
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binary_copy::BinaryCopyInWriter,
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connect,
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Socket,
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types::{Json, Type},
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tls::MakeTlsConnect
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};
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fn get_tls(cert: PathBuf) -> MakeTlsConnector {
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let cert = std::fs::read(cert).expect("to read cert file");
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let cert = Certificate::from_pem(&cert).expect("to build cert");
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let connector = TlsConnector::builder()
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.add_root_certificate(cert)
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.build()
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.expect("to build tls connector");
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MakeTlsConnector::new(connector)
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fn get_tls(cert: PathBuf) -> anyhow::Result<MakeTlsConnector> {
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let cert = std::fs::read(cert)?;
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let cert = Certificate::from_pem(&cert)?;
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let connector = TlsConnector::builder().add_root_certificate(cert).build()?;
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Ok(MakeTlsConnector::new(connector))
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}
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+
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async fn get_client_and_task<T>(
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uri: &str,
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connector: T,
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) -> Result<(Client, JoinHandle<Result<(), PgError>>), PgError>
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+
where
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T: MakeTlsConnect<Socket>,
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<T as MakeTlsConnect<Socket>>::Stream: Send + 'static,
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{
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let (client, connection) = connect(uri, connector).await?;
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Ok((client, spawn(connection)))
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}
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/// a little tokio-postgres helper
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///
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/// it's clone for easiness. it doesn't share any resources underneath after
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-
/// cloning at all so it's not meant for
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/// cloning *at all* so it's not meant for eg. handling public web requests
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#[derive(Clone)]
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pub struct Db {
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pg_uri: String,
···
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// it's what we expect: check for db migrations.
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log::trace!("checking migrations...");
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let connector = cert.map(get_tls);
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let connector = cert.map(get_tls).transpose()?;
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56
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-
let (client, connection_task) = if let Some(ref connector) = connector {
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let (client, connection) = connect(pg_uri, connector.clone()).await?;
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let task = tokio::task::spawn(async move {
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connection
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.await
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.inspect_err(|e| log::error!("connection ended with error: {e}"))
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.expect("pg validation connection not to blow up");
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});
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(client, task)
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+
let (client, conn_task) = if let Some(ref connector) = connector {
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get_client_and_task(pg_uri, connector.clone()).await?
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} else {
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let (client, connection) = connect(pg_uri, NoTls).await?;
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let task = tokio::task::spawn(async move {
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connection
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.await
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.inspect_err(|e| log::error!("connection ended with error: {e}"))
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.expect("pg validation connection not to blow up");
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});
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(client, task)
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+
get_client_and_task(pg_uri, NoTls).await?
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};
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let migrations: Vec<String> = client
···
77
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);
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drop(client);
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// make sure the connection worker thing doesn't linger
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connection_task.await?;
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conn_task.await??;
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log::info!("db connection succeeded and plc migrations appear as expected");
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Ok(Self {
···
86
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})
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}
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-
pub async fn connect(&self) -> Result<Client, PgError> {
89
+
#[must_use]
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pub async fn connect(&self) -> Result<(Client, JoinHandle<Result<(), PgError>>), PgError> {
90
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log::trace!("connecting postgres...");
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let client = if let Some(ref connector) = self.cert {
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let (client, connection) = connect(&self.pg_uri, connector.clone()).await?;
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-
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// send the connection away to do the actual communication work
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// apparently the connection will complete when the client drops
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tokio::task::spawn(async move {
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connection
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.await
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.inspect_err(|e| log::error!("connection ended with error: {e}"))
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.expect("pg connection not to blow up");
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});
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client
92
+
if let Some(ref connector) = self.cert {
93
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get_client_and_task(&self.pg_uri, connector.clone()).await
103
94
} else {
104
-
let (client, connection) = connect(&self.pg_uri, NoTls).await?;
105
-
106
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// send the connection away to do the actual communication work
107
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// apparently the connection will complete when the client drops
108
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tokio::task::spawn(async move {
109
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connection
110
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.await
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.inspect_err(|e| log::error!("connection ended with error: {e}"))
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.expect("pg connection not to blow up");
113
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});
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client
115
-
};
116
-
117
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Ok(client)
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+
get_client_and_task(&self.pg_uri, NoTls).await
96
+
}
118
97
}
119
98
120
99
pub async fn get_latest(&self) -> Result<Option<Dt>, PgError> {
121
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let client = self.connect().await?;
100
+
let (client, task) = self.connect().await?;
122
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let dt: Option<Dt> = client
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.query_opt(
124
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r#"SELECT "createdAt"
···
129
108
)
130
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.await?
131
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.map(|row| row.get(0));
111
+
drop(task);
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Ok(dt)
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113
}
134
114
}
···
137
117
db: Db,
138
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mut pages: mpsc::Receiver<ExportPage>,
139
119
) -> anyhow::Result<&'static str> {
140
-
let mut client = db.connect().await?;
120
+
let (mut client, task) = db.connect().await?;
141
121
142
122
let ops_stmt = client
143
123
.prepare(
···
174
154
}
175
155
tx.commit().await?;
176
156
}
157
+
drop(task);
177
158
178
159
log::info!(
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160
"no more pages. inserted {ops_inserted} ops and {dids_inserted} dids in {:?}",
···
201
182
mut pages: mpsc::Receiver<ExportPage>,
202
183
notify_last_at: Option<oneshot::Sender<Option<Dt>>>,
203
184
) -> anyhow::Result<&'static str> {
204
-
let mut client = db.connect().await?;
185
+
let (mut client, task) = db.connect().await?;
205
186
206
187
let t0 = Instant::now();
207
188
let tx = client.transaction().await?;
···
316
297
log::trace!("set tables LOGGED: {:?}", t_step.elapsed());
317
298
318
299
tx.commit().await?;
300
+
drop(task);
319
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log::info!("total backfill time: {:?}", t0.elapsed());
320
302
321
303
Ok("backfill_to_pg")