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'use strict';
import { readfile, writefile, unlink, mkdir, rmdir, lsdir, chmod } from 'fs';
const ubus = require('ubus');
const REG_DIR = '/tmp/run/uvol/.meta/uxc';
const META_DIR = '/tmp/run/uvol/.meta';
const STACK_DIR = '/usr/share/uxc/stacks';
let action = ARGV[0];
let app = ARGV[1];
let hosts_file = null;
if (action != 'up' && action != 'down' || !app)
die('usage: uxc-stack <up|down> <app>');
function read_json(path) {
let raw = readfile(path);
return raw ? json(raw) : null;
}
function uxc(...args) {
let rc = system([ 'uxc', ...args ]);
if (rc != 0)
printf('uxc-stack: uxc %s -> %d\n', join(' ', args), rc);
return rc;
}
function qname(name) {
return app + '.' + name;
}
let comp = { instances: [], secrets: {} };
let api = {
instance: function(name, spec) {
spec ??= {};
spec.name = name;
push(comp.instances, spec);
return spec;
},
generate: function(scope) {
comp.secrets[scope] = true;
return 'generate@' + app + '/' + scope;
},
};
function compose_stack() {
let tmpl_path = STACK_DIR + '/' + app + '.uc';
let prog = loadfile(tmpl_path);
if (!prog)
die('uxc-stack: cannot load stack template ' + tmpl_path);
let compose = prog();
if (type(compose) != 'function')
die('uxc-stack: ' + tmpl_path + ' must return a compose(api) function');
compose(api);
}
function stack_members() {
let out = [];
for (let e in (lsdir(REG_DIR) ?? [])) {
if (substr(e, -5) != '.json')
continue;
let reg = read_json(REG_DIR + '/' + e);
if (reg && reg.origin == 'stack:' + app)
push(out, reg);
}
return out;
}
function fnv1a(s) {
let h = 2166136261;
for (let i = 0; i < length(s); i++) {
h ^= ord(s, i);
h = (h * 16777619) & 0xffffffff;
}
return h;
}
function idmap_offset(qn) {
return ((fnv1a(qn) % 0x7000) + 1) * 0x10000;
}
function backhaul_net() {
let slot = fnv1a(app) % 512;
return sprintf('198.%d.%d', 18 + (slot >> 8), slot & 0xff);
}
function build_registration(inst) {
if (!inst.image)
die('uxc-stack: instance ' + inst.name + ' declares no image');
let img = read_json(REG_DIR + '/' + inst.image + '.json');
if (!img)
die('uxc-stack: image "' + inst.image + '" not installed (need container-' + inst.image + ')');
let reg = {
name: qname(inst.name),
image: img.image,
'image-digest': img['image-digest'],
path: img.path,
origin: 'stack:' + app,
autostart: true,
};
if (length(inst.volumes)) {
let vols = [];
for (let v in inst.volumes) {
let p = split(v, ':');
push(vols, { name: p[0], mountpoint: p[1], size: p[2] });
}
reg['data-volumes'] = vols;
}
if (inst.overlay)
reg['temp-overlay-size'] = inst.overlay;
else if (img['temp-overlay-size'])
reg['temp-overlay-size'] = img['temp-overlay-size'];
else if (img['overlay-size'])
reg['overlay-size'] = img['overlay-size'];
if (inst.env)
reg.initenv = inst.env;
let prov = [];
if (inst.provision || inst.secrets) {
let pdir = META_DIR + '/stacks/' + app + '/' + inst.name;
mkdir(META_DIR + '/stacks/' + app, 0700);
mkdir(pdir, 0700);
for (let dest in (inst.provision ?? {})) {
let src = pdir + '/' + replace(dest, /[^A-Za-z0-9._-]/g, '_');
if (writefile(src, inst.provision[dest]) == null)
die('uxc-stack: cannot write provisioned file ' + src);
chmod(src, 0644);
push(prov, { source: src, destination: dest });
}
for (let dest in (inst.secrets ?? {}))
push(prov, { source: META_DIR + '/secrets/' + app + '/' +
inst.secrets[dest] + '/value', destination: dest, secret: true });
}
if (length(prov))
reg.provision = prov;
reg['idmap-offset'] = sprintf('%d', idmap_offset(reg.name));
if (hosts_file)
reg['hosts-file'] = hosts_file;
return reg;
}
function instance_up(inst) {
let reg = build_registration(inst);
let path = REG_DIR + '/' + reg.name + '.json';
if (writefile(path, sprintf('%.J\n', reg)) == null)
die('uxc-stack: cannot write ' + path);
}
function bringup() {
ubus.call({ object: 'service', method: 'event',
data: { type: 'uxc.bringup', data: {} } });
let err = ubus.error();
if (err)
die('uxc-stack: cannot trigger bring-up: ' + err);
}
function backhaul_prepare() {
let net = backhaul_net();
let hdir = META_DIR + '/stacks/' + app;
let hosts = '127.0.0.1\tlocalhost\n::1\tlocalhost ip6-localhost ip6-loopback\n';
let i = 0, ordered, inst, side;
ordered = sort(comp.instances, function(a, b) {
return (a.name < b.name) ? -1 : (a.name > b.name) ? 1 : 0;
});
for (inst in ordered) {
inst.bh_address = net + '.' + (i + 1);
hosts += inst.bh_address + '\t' + inst.name + '\n';
i++;
}
mkdir(META_DIR + '/stacks', 0700);
mkdir(hdir, 0700);
writefile(hdir + '/hosts', hosts);
hosts_file = hdir + '/hosts';
for (inst in comp.instances) {
side = {
'org.openwrt.network.backhaul': app,
'org.openwrt.network.backhaul-address': inst.bh_address,
};
if (inst.access) {
let f = split(inst.access, ' ');
side['org.openwrt.network.attach'] = f[0];
for (let n = 1; n < length(f); n++) {
let kv = split(f[n], '=');
if (kv[0] == 'egress')
side['org.openwrt.network.egress'] = kv[1];
else if (kv[0] == 'ingress')
side['org.openwrt.network.ingress'] = kv[1];
else if (kv[0] == 'host')
side['org.openwrt.network.host'] = kv[1];
}
}
if (inst.proto)
side['org.openwrt.network.proto'] = inst.proto;
if (inst.proto6)
side['org.openwrt.network.proto6'] = inst.proto6;
if (inst.ip6ifaceid)
side['org.openwrt.network.ip6ifaceid'] = inst.ip6ifaceid;
writefile(REG_DIR + '/' + qname(inst.name) + '.annotations', sprintf('%J\n', side));
}
}
if (action == 'up') {
compose_stack();
backhaul_prepare();
for (let inst in comp.instances)
instance_up(inst);
bringup();
} else {
let members = stack_members();
let kept = [];
for (let reg in members) {
let krc = system([ 'uxc', 'kill', reg.name ]);
if (krc != 0 && krc != 254)
printf('uxc-stack: uxc kill %s -> %d\n', reg.name, krc);
uxc('delete', reg.name);
unlink(REG_DIR + '/' + reg.name + '.json');
unlink(REG_DIR + '/' + reg.name + '.annotations');
system([ 'rm', '-rf', META_DIR + '/uxc/state/' + reg.name ]);
for (let v in (reg['data-volumes'] ?? []))
push(kept, reg.name + '.' + v.name);
}
unlink(META_DIR + '/stacks/' + app + '/hosts');
rmdir(META_DIR + '/stacks/' + app);
let secrets = lsdir(META_DIR + '/secrets/' + app) ?? [];
if (length(kept)) {
warn('uxc-stack: kept data volume(s) for ' + app +
'; remove manually if the data is no longer needed:\n');
for (let vn in kept)
warn(' uvol remove ' + vn + '\n');
}
if (length(secrets)) {
warn('uxc-stack: kept generated secret(s) for ' + app +
' (paired with the data above; reused on reinstall); remove with:\n');
warn(' rm -rf ' + META_DIR + '/secrets/' + app + '\n');
}
}
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