112 lines
4.5 KiB
Nix
112 lines
4.5 KiB
Nix
let
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# Makes a test for a PostgreSQL package, given by name and looked up from `pkgs`.
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makePostgresqlWalReceiverTest = postgresqlPackage:
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{
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name = postgresqlPackage;
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value =
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import ./make-test-python.nix ({ pkgs, lib, ... }: let
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pkg = pkgs."${postgresqlPackage}";
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postgresqlDataDir = "/var/lib/postgresql/${pkg.psqlSchema}";
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replicationUser = "wal_receiver_user";
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replicationSlot = "wal_receiver_slot";
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replicationConn = "postgresql://${replicationUser}@localhost";
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baseBackupDir = "/tmp/pg_basebackup";
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walBackupDir = "/tmp/pg_wal";
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atLeast12 = lib.versionAtLeast pkg.version "12.0";
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recoveryFile = if atLeast12
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then pkgs.writeTextDir "recovery.signal" ""
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else pkgs.writeTextDir "recovery.conf" "restore_command = 'cp ${walBackupDir}/%f %p'";
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in {
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name = "postgresql-wal-receiver-${postgresqlPackage}";
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meta.maintainers = with lib.maintainers; [ pacien ];
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machine = { ... }: {
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services.postgresql = {
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package = pkg;
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enable = true;
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settings = lib.mkMerge [
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{
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wal_level = "archive"; # alias for replica on pg >= 9.6
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max_wal_senders = 10;
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max_replication_slots = 10;
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}
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(lib.mkIf atLeast12 {
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restore_command = "cp ${walBackupDir}/%f %p";
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recovery_end_command = "touch recovery.done";
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})
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];
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authentication = ''
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host replication ${replicationUser} all trust
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'';
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initialScript = pkgs.writeText "init.sql" ''
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create user ${replicationUser} replication;
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select * from pg_create_physical_replication_slot('${replicationSlot}');
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'';
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};
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services.postgresqlWalReceiver.receivers.main = {
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postgresqlPackage = pkg;
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connection = replicationConn;
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slot = replicationSlot;
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directory = walBackupDir;
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};
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# This is only to speedup test, it isn't time racing. Service is set to autorestart always,
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# default 60sec is fine for real system, but is too much for a test
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systemd.services.postgresql-wal-receiver-main.serviceConfig.RestartSec = lib.mkForce 5;
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};
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testScript = ''
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# make an initial base backup
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machine.wait_for_unit("postgresql")
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machine.wait_for_unit("postgresql-wal-receiver-main")
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# WAL receiver healthchecks PG every 5 seconds, so let's be sure they have connected each other
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# required only for 9.4
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machine.sleep(5)
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machine.succeed(
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"${pkg}/bin/pg_basebackup --dbname=${replicationConn} --pgdata=${baseBackupDir}"
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)
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# create a dummy table with 100 records
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machine.succeed(
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"sudo -u postgres psql --command='create table dummy as select * from generate_series(1, 100) as val;'"
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)
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# stop postgres and destroy data
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machine.systemctl("stop postgresql")
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machine.systemctl("stop postgresql-wal-receiver-main")
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machine.succeed("rm -r ${postgresqlDataDir}/{base,global,pg_*}")
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# restore the base backup
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machine.succeed(
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"cp -r ${baseBackupDir}/* ${postgresqlDataDir} && chown postgres:postgres -R ${postgresqlDataDir}"
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)
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# prepare WAL and recovery
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machine.succeed("chmod a+rX -R ${walBackupDir}")
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machine.execute(
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"for part in ${walBackupDir}/*.partial; do mv $part ''${part%%.*}; done"
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) # make use of partial segments too
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machine.succeed(
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"cp ${recoveryFile}/* ${postgresqlDataDir}/ && chmod 666 ${postgresqlDataDir}/recovery*"
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)
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# replay WAL
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machine.systemctl("start postgresql")
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machine.wait_for_file("${postgresqlDataDir}/recovery.done")
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machine.systemctl("restart postgresql")
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machine.wait_for_unit("postgresql")
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# check that our records have been restored
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machine.succeed(
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"test $(sudo -u postgres psql --pset='pager=off' --tuples-only --command='select count(distinct val) from dummy;') -eq 100"
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)
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'';
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});
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};
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# Maps the generic function over all attributes of PostgreSQL packages
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in builtins.listToAttrs (map makePostgresqlWalReceiverTest (builtins.attrNames (import ../../pkgs/servers/sql/postgresql { })))
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