Line data    Source code

       1              : use std::collections::HashMap;
       2              : 
       3              : use anyhow::Result;
       4              : use compute_api::responses::{InstalledExtension, InstalledExtensions};
       5              : use tokio_postgres::{Client, Config, NoTls};
       6              : 
       7              : use crate::metrics::INSTALLED_EXTENSIONS;
       8              : 
       9              : /// We don't reuse get_existing_dbs() just for code clarity
      10              : /// and to make database listing query here more explicit.
      11              : ///
      12              : /// Limit the number of databases to 500 to avoid excessive load.
      13            0 : async fn list_dbs(client: &mut Client) -> Result<Vec<String>> {
      14              :     // `pg_database.datconnlimit = -2` means that the database is in the
      15              :     // invalid state
      16            0 :     let databases = client
      17            0 :         .query(
      18            0 :             "SELECT datname FROM pg_catalog.pg_database
      19            0 :                 WHERE datallowconn
      20            0 :                 AND datconnlimit <> - 2
      21            0 :                 LIMIT 500",
      22            0 :             &[],
      23            0 :         )
      24            0 :         .await?
      25            0 :         .iter()
      26            0 :         .map(|row| {
      27            0 :             let db: String = row.get("datname");
      28            0 :             db
      29            0 :         })
      30            0 :         .collect();
      31            0 : 
      32            0 :     Ok(databases)
      33            0 : }
      34              : 
      35              : /// Connect to every database (see list_dbs above) and get the list of installed extensions.
      36              : ///
      37              : /// Same extension can be installed in multiple databases with different versions,
      38              : /// so we report a separate metric (number of databases where it is installed)
      39              : /// for each extension version.
      40            0 : pub async fn get_installed_extensions(mut conf: Config) -> Result<InstalledExtensions> {
      41            0 :     conf.application_name("compute_ctl:get_installed_extensions");
      42            0 :     let databases: Vec<String> = {
      43            0 :         let (mut client, connection) = conf.connect(NoTls).await?;
      44            0 :         tokio::spawn(async move {
      45            0 :             if let Err(e) = connection.await {
      46            0 :                 eprintln!("connection error: {}", e);
      47            0 :             }
      48            0 :         });
      49            0 : 
      50            0 :         list_dbs(&mut client).await?
      51              :     };
      52              : 
      53            0 :     let mut extensions_map: HashMap<(String, String, String), InstalledExtension> = HashMap::new();
      54            0 :     for db in databases.iter() {
      55            0 :         conf.dbname(db);
      56              : 
      57            0 :         let (client, connection) = conf.connect(NoTls).await?;
      58            0 :         tokio::spawn(async move {
      59            0 :             if let Err(e) = connection.await {
      60            0 :                 eprintln!("connection error: {}", e);
      61            0 :             }
      62            0 :         });
      63              : 
      64            0 :         let extensions: Vec<(String, String, i32)> = client
      65            0 :             .query(
      66            0 :                 "SELECT extname, extversion, extowner::integer FROM pg_catalog.pg_extension",
      67            0 :                 &[],
      68            0 :             )
      69            0 :             .await?
      70            0 :             .iter()
      71            0 :             .map(|row| {
      72            0 :                 (
      73            0 :                     row.get("extname"),
      74            0 :                     row.get("extversion"),
      75            0 :                     row.get("extowner"),
      76            0 :                 )
      77            0 :             })
      78            0 :             .collect();
      79              : 
      80            0 :         for (extname, v, extowner) in extensions.iter() {
      81            0 :             let version = v.to_string();
      82              : 
      83              :             // check if the extension is owned by superuser
      84              :             // 10 is the oid of superuser
      85            0 :             let owned_by_superuser = if *extowner == 10 { "1" } else { "0" };
      86              : 
      87            0 :             extensions_map
      88            0 :                 .entry((
      89            0 :                     extname.to_string(),
      90            0 :                     version.clone(),
      91            0 :                     owned_by_superuser.to_string(),
      92            0 :                 ))
      93            0 :                 .and_modify(|e| {
      94            0 :                     // count the number of databases where the extension is installed
      95            0 :                     e.n_databases += 1;
      96            0 :                 })
      97            0 :                 .or_insert(InstalledExtension {
      98            0 :                     extname: extname.to_string(),
      99            0 :                     version: version.clone(),
     100            0 :                     n_databases: 1,
     101            0 :                     owned_by_superuser: owned_by_superuser.to_string(),
     102            0 :                 });
     103            0 :         }
     104              :     }
     105              : 
     106            0 :     for (key, ext) in extensions_map.iter() {
     107            0 :         let (extname, version, owned_by_superuser) = key;
     108            0 :         let n_databases = ext.n_databases as u64;
     109            0 : 
     110            0 :         INSTALLED_EXTENSIONS
     111            0 :             .with_label_values(&[extname, version, owned_by_superuser])
     112            0 :             .set(n_databases);
     113            0 :     }
     114              : 
     115            0 :     Ok(InstalledExtensions {
     116            0 :         extensions: extensions_map.into_values().collect(),
     117            0 :     })
     118            0 : }