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use anyhow::{anyhow, bail};
use openssl::ssl::{SslConnector, SslFiletype, SslMethod, SslVerifyMode};
use postgres_openssl::MakeTlsConnector;
use std::time::Duration;
use tokio_postgres::config::{ReplicationMode, SslMode};
use tokio_postgres::{Client, Config};
use mz_ore::task;
use crate::desc::{PostgresColumnDesc, PostgresTableDesc};
pub mod desc;
pub fn make_tls(config: &Config) -> Result<MakeTlsConnector, anyhow::Error> {
let mut builder = SslConnector::builder(SslMethod::tls_client())?;
let (verify_mode, verify_hostname) = match config.get_ssl_mode() {
SslMode::Disable | SslMode::Prefer => (SslVerifyMode::NONE, false),
SslMode::Require => match config.get_ssl_root_cert() {
Some(_) => (SslVerifyMode::PEER, false),
None => (SslVerifyMode::NONE, false),
},
SslMode::VerifyCa => (SslVerifyMode::PEER, false),
SslMode::VerifyFull => (SslVerifyMode::PEER, true),
_ => panic!("unexpected sslmode {:?}", config.get_ssl_mode()),
};
builder.set_verify(verify_mode);
match (config.get_ssl_cert(), config.get_ssl_key()) {
(Some(ssl_cert), Some(ssl_key)) => {
builder.set_certificate_file(ssl_cert, SslFiletype::PEM)?;
builder.set_private_key_file(ssl_key, SslFiletype::PEM)?;
}
(None, Some(_)) => bail!("must provide both sslcert and sslkey, but only provided sslkey"),
(Some(_), None) => bail!("must provide both sslcert and sslkey, but only provided sslcert"),
_ => {}
}
if let Some(ssl_root_cert) = config.get_ssl_root_cert() {
builder.set_ca_file(ssl_root_cert)?
}
let mut tls_connector = MakeTlsConnector::new(builder.build());
match (verify_mode, verify_hostname) {
(SslVerifyMode::PEER, false) => tls_connector.set_callback(|connect, _| {
connect.set_verify_hostname(false);
Ok(())
}),
_ => {}
}
Ok(tls_connector)
}
pub async fn publication_info(
conn: &str,
publication: &str,
) -> Result<Vec<PostgresTableDesc>, anyhow::Error> {
let config = conn.parse()?;
let tls = make_tls(&config)?;
let (client, connection) = config.connect(tls).await?;
task::spawn(|| format!("postgres_publication_info:{conn}"), connection);
client
.query(
"SELECT oid FROM pg_publication WHERE pubname = $1",
&[&publication],
)
.await?
.get(0)
.ok_or_else(|| anyhow!("publication {:?} does not exist", publication))?;
let tables = client
.query(
"SELECT
c.oid, p.schemaname, p.tablename
FROM
pg_catalog.pg_class AS c
JOIN pg_namespace AS n ON c.relnamespace = n.oid
JOIN pg_publication_tables AS p ON
c.relname = p.tablename AND n.nspname = p.schemaname
WHERE
p.pubname = $1",
&[&publication],
)
.await?;
let mut table_infos = vec![];
for row in tables {
let oid = row.get("oid");
let columns = client
.query(
"SELECT
a.attname AS name,
a.atttypid AS typoid,
a.atttypmod AS typmod,
a.attnotnull AS not_null,
b.oid IS NOT NULL AS primary_key
FROM pg_catalog.pg_attribute a
LEFT JOIN pg_catalog.pg_constraint b
ON a.attrelid = b.conrelid
AND b.contype = 'p'
AND a.attnum = ANY (b.conkey)
WHERE a.attnum > 0::pg_catalog.int2
AND NOT a.attisdropped
AND a.attrelid = $1
ORDER BY a.attnum",
&[&oid],
)
.await?
.into_iter()
.map(|row| {
let name: String = row.get("name");
let type_oid = row.get("typoid");
let type_mod: i32 = row.get("typmod");
let not_null: bool = row.get("not_null");
let primary_key = row.get("primary_key");
Ok(PostgresColumnDesc {
name,
type_oid,
type_mod,
nullable: !not_null,
primary_key,
})
})
.collect::<Result<Vec<_>, anyhow::Error>>()?;
table_infos.push(PostgresTableDesc {
oid,
namespace: row.get("schemaname"),
name: row.get("tablename"),
columns,
});
}
Ok(table_infos)
}
pub async fn drop_replication_slots(conn: &str, slots: &[String]) -> Result<(), anyhow::Error> {
let config = conn.parse()?;
let tls = make_tls(&config)?;
let (client, connection) = tokio_postgres::connect(&conn, tls).await?;
task::spawn(
|| format!("postgres_drop_replication_slots:{conn}"),
connection,
);
let replication_client = connect_replication(conn).await?;
for slot in slots {
let rows = client
.query(
"SELECT active_pid FROM pg_replication_slots WHERE slot_name = $1::TEXT",
&[&slot],
)
.await?;
match rows.len() {
0 => {
continue;
}
1 => {
replication_client
.simple_query(&format!("DROP_REPLICATION_SLOT {} WAIT", slot))
.await?;
}
_ => {
return Err(anyhow!(
"multiple pg_replication_slots entries for slot {}",
&slot
))
}
}
}
Ok(())
}
pub async fn connect_replication(conn: &str) -> Result<Client, anyhow::Error> {
let mut config: Config = conn.parse()?;
let tls = make_tls(&config)?;
let (client, connection) = config
.replication_mode(ReplicationMode::Logical)
.connect_timeout(Duration::from_secs(30))
.keepalives_idle(Duration::from_secs(10 * 60))
.connect(tls)
.await?;
task::spawn(
|| format!("postgres_connect_replication:{conn}"),
connection,
);
Ok(client)
}