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up2k.js: detect broken webworkers;

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the first time a file is to be hashed after a website refresh,
a set of webworkers are launched for efficient parallelization

in the unlikely event of a network outage exactly at this point,
the workers will fail to start, and the hashing would never begin

add a ping/pong sequence to smoketest the workers, and
fallback to hashing on the main-thread when necessary
This commit is contained in:
ed 2024-10-18 16:50:15 +00:00
parent a9b4436cdc
commit 5ca8f0706d
2 changed files with 28 additions and 5 deletions
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28
copyparty/web/up2k.js
View file

@ -17,6 +17,8 @@ function goto_up2k() {
var up2k = null,
up2k_hooks = [],
hws = [],
hws_ok = 0,
hws_ng = false,
sha_js = WebAssembly ? 'hw' : 'ac', // ff53,c57,sa11
m = 'will use ' + sha_js + ' instead of native sha512 due to';
@ -1964,7 +1966,7 @@ function up2k_init(subtle) {
pvis.setab(t.n, nchunks);
pvis.move(t.n, 'bz');
if (hws.length && uc.hashw && (nchunks > 1 || document.visibilityState == 'hidden'))
if (hws.length && !hws_ng && uc.hashw && (nchunks > 1 || document.visibilityState == 'hidden'))
// resolving subtle.digest w/o worker takes 1sec on blur if the actx hack breaks
return wexec_hash(t, chunksize, nchunks);
@ -2073,16 +2075,27 @@ function up2k_init(subtle) {
free = [],
busy = {},
nbusy = 0,
init = 0,
hashtab = {},
mem = (MOBILE ? 128 : 256) * 1024 * 1024;
if (!hws_ok)
init = setTimeout(function() {
hws_ng = true;
toast.warn(30, 'webworkers failed to start\n\nwill be a bit slower due to\nhashing on main-thread');
apop(st.busy.hash, t);
st.todo.hash.unshift(t);
exec_hash();
}, 5000);
for (var a = 0; a < hws.length; a++) {
var w = hws[a];
free.push(w);
w.onmessage = onmsg;
if (init)
w.postMessage('ping');
if (mem > 0)
free.push(w);
mem -= chunksize;
if (mem <= 0)
break;
}
function go_next() {
@ -2112,6 +2125,12 @@ function up2k_init(subtle) {
d = d.data;
var k = d[0];
if (k == "pong")
if (++hws_ok == hws.length) {
clearTimeout(init);
go_next();
}
if (k == "panic")
return vis_exh(d[1], 'up2k.js', '', '', d[1]);
@ -2174,6 +2193,7 @@ function up2k_init(subtle) {
tasker();
}
}
if (!init)
go_next();
}

3
copyparty/web/w.hash.js
View file

@ -33,6 +33,9 @@ onmessage = (d) => {
if (d.data == 'nosubtle')
return load_fb();
if (d.data == 'ping')
return postMessage(['pong']);
if (busy)
return postMessage(["panic", 'worker got another task while busy']);