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{ config, lib, pkgs, ... }:
let
inherit (builtins)
match ;
inherit (lib)
concatMapStringsSep concatStringsSep filterAttrs flatten foldAttrs foldl
mapAttrsToList mkOption ;
inherit (lib.types)
attrsOf submodule ;
explicit = filterAttrs (n: v: n != "_module" && v != null);
concatMapAttrsSep = s: f: attrs: concatStringsSep s (mapAttrsToList f attrs);
instances = explicit config.nixsap.apps.cassandra;
users = mapAttrsToList (_: i: i.user) instances;
keyrings =
let
ik = mapAttrsToList (n: i: { "${i.user}" = []; } ) instances;
in foldAttrs (l: r: l ++ r) [] ik;
mkService = name: cfg:
let
tmpdir = "${cfg.home}/tmp";
cp = concatStringsSep ":" cfg.classpath;
isDir = d: _: match ".*_director(y|ies)$" d != null;
directories = [ cfg.home ]
++ flatten (mapAttrsToList (_: d: d) (filterAttrs isDir (explicit cfg.parameters)));
directories_sh = concatMapStringsSep " " (d: "'${d}'") directories;
start = pkgs.writeBashScriptBin "cassandra-${name}" ''
set -euo pipefail
umask 0027
export HOME='${cfg.home}'
rm -rf -- '${cfg.jre.properties.java.io.tmpdir}'
mkdir -p -- '${cfg.jre.properties.java.io.tmpdir}'
exec ${cfg.jre.package}/bin/java \
-Dcassandra.config='${cfg.jre.properties.cassandra.config}' \
-Djava.io.tmpdir='${cfg.jre.properties.java.io.tmpdir}' \
-Djava.library.path='${concatStringsSep ":" cfg.jre.properties.java.library.path}' \
-cp '${cp}' \
org.apache.cassandra.service.CassandraDaemon
'';
in {
"cassandra-${name}" = {
description = "Cassandra (${name}) distributed NoSQL database";
wantedBy = [ "multi-user.target" ];
after = [ "keys.target" "network.target" "local-fs.target" ];
preStart = ''
mkdir -p -- ${directories_sh}
find ${directories_sh} -not -type l \( \
-not -user '${cfg.user}' \
-or -not -group '${cfg.user}' \
-or \( -type d -not -perm -u=wrx,g=rx \) \
-or \( -type f -not -perm -u=rw,g=r \) \
\) \
-exec chown -c -- '${cfg.user}:${cfg.user}' {} + \
-exec chmod -c -- u=rwX,g=rX,o= {} +
'';
unitConfig = {
# XXX It can be running long before fail:
StartLimitBurst = 3;
StartLimitIntervalSec = 60;
};
serviceConfig = {
ExecStart = "${start}/bin/cassandra-${name}";
KillMode = "mixed";
PermissionsStartOnly = true;
Restart = "always";
TimeoutSec = 0;
User = cfg.user;
LimitAS = "infinity";
LimitMEMLOCK = "infinity";
LimitNOFILE = 10000;
LimitNPROC = 32768;
};
};
};
in {
options.nixsap.apps.cassandra = mkOption {
description = "Cassandra instances";
default = {};
type = attrsOf (submodule (import ./instance.nix pkgs));
};
config = {
systemd.services = foldl (a: b: a//b) {} (mapAttrsToList mkService instances);
nixsap.deployment.keyrings = keyrings;
nixsap.system.users.daemons = users;
};
}
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