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up2k: upload semaphore across tabs/windows

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ed 2021-02-13 02:57:51 +01:00
parent b8481e32ba
commit 05b1dbaf56
1 changed files with 133 additions and 0 deletions
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133
copyparty/web/up2k.js
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@ -89,6 +89,99 @@ catch (ex) {
}
function up2k_flagbus() {
var flag = {
"id": Math.floor(Math.random() * 1024 * 1024 * 1023 * 2),
"ch": new BroadcastChannel("up2k_flagbus"),
"ours": false,
"owner": null,
"wants": null,
"act": false,
"last_tx": ["x", null]
};
flag.ch.onmessage = function (ev) {
console.log('flagbus(' + flag.id + '): ' + ev.data);
var who = ev.data[0],
what = ev.data[1];
if (who == flag.id) {
console.log('flagbus: hi me (??)');
return;
}
flag.act = new Date().getTime();
if (what == "want") {
// lowest id wins, don't care if that's us
if (who < flag.id) {
console.log('flagbus: got wants (ack)');
flag.wants = [who, flag.act];
}
else {
console.log('flagbus: got wants (ign)');
}
}
else if (what == "have") {
console.log('flagbus: got have');
flag.owner = [who, flag.act];
}
else if (what == "give") {
if (flag.owner && flag.owner[0] == who) {
flag.owner = null;
console.log('flagbus: got good give');
}
else {
console.log('flagbus: got bad give wth');
}
}
else if (what == "hi") {
console.log('flagbus: got hi');
flag.ch.postMessage([flag.id, "hey"]);
}
};
var tx = function (now, msg) {
var td = now - flag.last_tx[1];
if (td > 500 || flag.last_tx[0] != msg) {
flag.ch.postMessage([flag.id, msg]);
console.log('flagbus: tx ' + msg);
flag.last_tx = [msg, now];
}
};
var do_take = function (now) {
console.log('flagbus: do_take');
tx(now, "have");
flag.owner = [flag.id, now];
flag.ours = true;
};
var do_want = function (now) {
console.log('flagbus: do_want');
tx(now, "want");
};
flag.take = function (now) {
if (flag.ours) {
do_take(now);
return;
}
if (flag.owner && now - flag.owner[1] > 5000) {
flag.owner = null;
}
if (flag.wants && now - flag.wants[1] > 5000) {
flag.wants = null;
}
if (!flag.owner && !flag.wants) {
do_take(now);
return;
}
do_want(now);
};
flag.give = function () {
flag.ch.postMessage([flag.id, "give"]);
console.log('flagbus: put give');
flag.owner = null;
flag.ours = false;
};
flag.ch.postMessage([flag.id, 'hi']);
return flag;
}
function up2k_init(have_crypto) {
//have_crypto = false;
var need_filereader_cache = undefined;
@ -233,6 +326,14 @@ function up2k_init(have_crypto) {
if (!bobslice || !window.FileReader || !window.FileList)
return un2k("this is the basic uploader; up2k needs at least<br />chrome 21 // firefox 13 // edge 12 // opera 12 // safari 5.1");
var flag = false;
try {
flag = up2k_flagbus();
}
catch (ex) {
console.log("flag error: " + ex.toString());
}
function nav() {
ebi('file' + fdom_ctr).click();
}
@ -379,6 +480,38 @@ function up2k_init(have_crypto) {
mutex = true;
while (true) {
ebi('srv_info').innerHTML =
new Date().getTime() + ", " +
st.todo.hash.length + ", " +
st.todo.handshake.length + ", " +
st.todo.upload.length + ", " +
st.busy.hash.length + ", " +
st.busy.handshake.length + ", " +
st.busy.upload.length;
if (flag) {
var need_flag = 0 !=
st.todo.hash.length +
st.todo.handshake.length +
st.todo.upload.length +
st.busy.hash.length +
st.busy.handshake.length +
st.busy.upload.length;
if (need_flag) {
var now = new Date().getTime();
flag.take(now);
if (!flag.ours) {
setTimeout(taskerd, 100);
mutex = false;
return;
}
}
else if (flag.ours) {
flag.give();
}
}
var mou_ikkai = false;
if (st.todo.handshake.length > 0 &&