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gun.js
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;(function(){
/* UNBUILD */
function USE(arg, req){
return req? require(arg) : arg.slice? USE[R(arg)] : function(mod, path){
arg(mod = {exports: {}});
USE[R(path)] = mod.exports;
}
function R(p){
return p.split('/').slice(-1).toString().replace('.js','');
}
}
if(typeof module !== "undefined"){ var MODULE = module }
/* UNBUILD */
;USE(function(module){
// Shim for generic javascript utilities.
String.random = function(l, c){
var s = '';
l = l || 24; // you are not going to make a 0 length random number, so no need to check type
c = c || '0123456789ABCDEFGHIJKLMNOPQRSTUVWXZabcdefghijklmnopqrstuvwxyz';
while(l-- > 0){ s += c.charAt(Math.floor(Math.random() * c.length)) }
return s;
}
String.match = function(t, o){ var tmp, u;
if('string' !== typeof t){ return false }
if('string' == typeof o){ o = {'=': o} }
o = o || {};
tmp = (o['='] || o['*'] || o['>'] || o['<']);
if(t === tmp){ return true }
if(u !== o['=']){ return false }
tmp = (o['*'] || o['>']);
if(t.slice(0, (tmp||'').length) === tmp){ return true }
if(u !== o['*']){ return false }
if(u !== o['>'] && u !== o['<']){
return (t >= o['>'] && t <= o['<'])? true : false;
}
if(u !== o['>'] && t >= o['>']){ return true }
if(u !== o['<'] && t <= o['<']){ return true }
return false;
}
String.hash = function(s, c){ // via SO
if(typeof s !== 'string'){ return }
c = c || 0; // CPU schedule hashing by
if(!s.length){ return c }
for(var i=0,l=s.length,n; i<l; ++i){
n = s.charCodeAt(i);
c = ((c<<5)-c)+n;
c |= 0;
}
return c;
}
var has = Object.prototype.hasOwnProperty;
Object.plain = function(o){ return o? (o instanceof Object && o.constructor === Object) || Object.prototype.toString.call(o).match(/^\[object (\w+)\]$/)[1] === 'Object' : false }
Object.empty = function(o, n){
for(var k in o){ if(has.call(o, k) && (!n || -1==n.indexOf(k))){ return false } }
return true;
}
Object.keys = Object.keys || function(o){
var l = [];
for(var k in o){ if(has.call(o, k)){ l.push(k) } }
return l;
}
;(function(){
var u, sT = setTimeout, l = 0, c = 0
, sI = (typeof setImmediate !== ''+u && setImmediate) || (function(c,f){
if(typeof MessageChannel == ''+u){ return sT }
(c = new MessageChannel()).port1.onmessage = function(e){ ''==e.data && f() }
return function(q){ f=q;c.port2.postMessage('') }
}()), check = sT.check = sT.check || (typeof performance !== ''+u && performance)
|| {now: function(){ return +new Date }};
sT.hold = sT.hold || 9; // half a frame benchmarks faster than < 1ms?
sT.poll = sT.poll || function(f){
if((sT.hold >= (check.now() - l)) && c++ < 3333){ f(); return }
sI(function(){ l = check.now(); f() },c=0)
}
}());
;(function(){ // Too many polls block, this "threads" them in turns over a single thread in time.
var sT = setTimeout, t = sT.turn = sT.turn || function(f){ 1 == s.push(f) && p(T) }
, s = t.s = [], p = sT.poll, i = 0, f, T = function(){
if(f = s[i++]){ f() }
if(i == s.length || 99 == i){
s = t.s = s.slice(i);
i = 0;
}
if(s.length){ p(T) }
}
}());
;(function(){
var u, sT = setTimeout, T = sT.turn;
(sT.each = sT.each || function(l,f,e,S){ S = S || 9; (function t(s,L,r){
if(L = (s = (l||[]).splice(0,S)).length){
for(var i = 0; i < L; i++){
if(u !== (r = f(s[i]))){ break }
}
if(u === r){ T(t); return }
} e && e(r);
}())})();
}());
})(USE, './shim');
;USE(function(module){
// On event emitter generic javascript utility.
module.exports = function onto(tag, arg, as){
if(!tag){ return {to: onto} }
var u, f = 'function' == typeof arg, tag = (this.tag || (this.tag = {}))[tag] || f && (
this.tag[tag] = {tag: tag, to: onto._ = { next: function(arg){ var tmp;
if(tmp = this.to){ tmp.next(arg) }
}}});
if(f){
var be = {
off: onto.off ||
(onto.off = function(){
if(this.next === onto._.next){ return !0 }
if(this === this.the.last){
this.the.last = this.back;
}
this.to.back = this.back;
this.next = onto._.next;
this.back.to = this.to;
if(this.the.last === this.the){
delete this.on.tag[this.the.tag];
}
}),
to: onto._,
next: arg,
the: tag,
on: this,
as: as,
};
(be.back = tag.last || tag).to = be;
return tag.last = be;
}
if((tag = tag.to) && u !== arg){ tag.next(arg) }
return tag;
};
})(USE, './onto');
;USE(function(module){
// Valid values are a subset of JSON: null, binary, number (!Infinity), text,
// or a soul relation. Arrays need special algorithms to handle concurrency,
// so they are not supported directly. Use an extension that supports them if
// needed but research their problems first.
module.exports = function (v) {
// "deletes", nulling out keys.
return v === null ||
"string" === typeof v ||
"boolean" === typeof v ||
// we want +/- Infinity to be, but JSON does not support it, sad face.
// can you guess what v === v checks for? ;)
("number" === typeof v && v != Infinity && v != -Infinity && v === v) ||
(!!v && "string" == typeof v["#"] && Object.keys(v).length === 1 && v["#"]);
}
})(USE, './valid');
;USE(function(module){
USE('./shim');
function State(){
var t = +new Date;
if(last < t){
return N = 0, last = t + State.drift;
}
return last = t + ((N += 1) / D) + State.drift;
}
State.drift = 0;
var NI = -Infinity, N = 0, D = 999, last = NI, u; // WARNING! In the future, on machines that are D times faster than 2016AD machines, you will want to increase D by another several orders of magnitude so the processing speed never out paces the decimal resolution (increasing an integer effects the state accuracy).
State.is = function(n, k, o){ // convenience function to get the state on a key on a node and return it.
var tmp = (k && n && n._ && n._['>']) || o;
if(!tmp){ return }
return ('number' == typeof (tmp = tmp[k]))? tmp : NI;
}
State.ify = function(n, k, s, v, soul){ // put a key's state on a node.
(n = n || {})._ = n._ || {}; // safety check or init.
if(soul){ n._['#'] = soul } // set a soul if specified.
var tmp = n._['>'] || (n._['>'] = {}); // grab the states data.
if(u !== k && k !== '_'){
if('number' == typeof s){ tmp[k] = s } // add the valid state.
if(u !== v){ n[k] = v } // Note: Not its job to check for valid values!
}
return n;
}
module.exports = State;
})(USE, './state');
;USE(function(module){
USE('./shim');
function Dup(opt){
var dup = {s:{}}, s = dup.s;
opt = opt || {max: 999, age: 1000 * 9};//*/ 1000 * 9 * 3};
dup.check = function(id){
if(!s[id]){ return false }
return dt(id);
}
var dt = dup.track = function(id){
var it = s[id] || (s[id] = {});
it.was = dup.now = +new Date;
if(!dup.to){ dup.to = setTimeout(dup.drop, opt.age + 9) }
if(dt.ed){ dt.ed(id) }
return it;
}
dup.drop = function(age){
dup.to = null;
dup.now = +new Date;
var l = Object.keys(s);
console.STAT && console.STAT(dup.now, +new Date - dup.now, 'dup drop keys'); // prev ~20% CPU 7% RAM 300MB // now ~25% CPU 7% RAM 500MB
setTimeout.each(l, function(id){ var it = s[id]; // TODO: .keys( is slow?
if(it && (age || opt.age) > (dup.now - it.was)){ return }
delete s[id];
},0,99);
}
return dup;
}
module.exports = Dup;
})(USE, './dup');
;USE(function(module){
// request / response module, for asking and acking messages.
USE('./onto'); // depends upon onto!
module.exports = function ask(cb, as){
if(!this.on){ return }
var lack = (this.opt||{}).lack || 9000;
if(!('function' == typeof cb)){
if(!cb){ return }
var id = cb['#'] || cb, tmp = (this.tag||'')[id];
if(!tmp){ return }
if(as){
tmp = this.on(id, as);
clearTimeout(tmp.err);
tmp.err = setTimeout(function(){ tmp.off() }, lack);
}
return true;
}
var id = (as && as['#']) || random(9);
if(!cb){ return id }
var to = this.on(id, cb, as);
to.err = to.err || setTimeout(function(){ to.off();
to.next({err: "Error: No ACK yet.", lack: true});
}, lack);
return id;
}
var random = String.random || function(){ return Math.random().toString(36).slice(2) }
})(USE, './ask');
;USE(function(module){
function Gun(o){
if(o instanceof Gun){ return (this._ = {$: this}).$ }
if(!(this instanceof Gun)){ return new Gun(o) }
return Gun.create(this._ = {$: this, opt: o});
}
Gun.is = function($){ return ($ instanceof Gun) || ($ && $._ && ($ === $._.$)) || false }
Gun.version = 0.2020;
Gun.chain = Gun.prototype;
Gun.chain.toJSON = function(){};
USE('./shim');
Gun.valid = USE('./valid');
Gun.state = USE('./state');
Gun.on = USE('./onto');
Gun.dup = USE('./dup');
Gun.ask = USE('./ask');
;(function(){
Gun.create = function(at){
at.root = at.root || at;
at.graph = at.graph || {};
at.on = at.on || Gun.on;
at.ask = at.ask || Gun.ask;
at.dup = at.dup || Gun.dup();
var gun = at.$.opt(at.opt);
if(!at.once){
at.on('in', universe, at);
at.on('out', universe, at);
at.on('put', map, at);
Gun.on('create', at);
at.on('create', at);
}
at.once = 1;
return gun;
}
function universe(msg){
// TODO: BUG! msg.out = null being set!
//if(!F){ var eve = this; setTimeout(function(){ universe.call(eve, msg,1) },Math.random() * 100);return; } // ADD F TO PARAMS!
if(!msg){ return }
if(msg.out === universe){ this.to.next(msg); return }
var eve = this, as = eve.as, at = as.at || as, gun = at.$, dup = at.dup, tmp, DBG = msg.DBG;
(tmp = msg['#']) || (tmp = msg['#'] = text_rand(9));
if(dup.check(tmp)){ return } dup.track(tmp);
tmp = msg._; msg._ = ('function' == typeof tmp)? tmp : function(){};
(msg.$ && (msg.$ === (msg.$._||'').$)) || (msg.$ = gun);
if(msg['@'] && !msg.put){ ack(msg) }
if(!at.ask(msg['@'], msg)){ // is this machine listening for an ack?
DBG && (DBG.u = +new Date);
if(msg.put){ put(msg); return } else
if(msg.get){ Gun.on.get(msg, gun) }
}
DBG && (DBG.uc = +new Date);
eve.to.next(msg);
DBG && (DBG.ua = +new Date);
if(msg.nts || msg.NTS){ return } // TODO: This shouldn't be in core, but fast way to prevent NTS spread. Delete this line after all peers have upgraded to newer versions.
msg.out = universe; at.on('out', msg);
DBG && (DBG.ue = +new Date);
}
function put(msg){
if(!msg){ return }
var ctx = msg._||'', root = ctx.root = ((ctx.$ = msg.$||'')._||'').root;
if(msg['@'] && ctx.faith && !ctx.miss){ // TODO: AXE may split/route based on 'put' what should we do here? Detect @ in AXE? I think we don't have to worry, as DAM will route it on @.
msg.out = universe;
root.on('out', msg);
return;
}
ctx.latch = root.hatch; ctx.match = root.hatch = [];
var put = msg.put;
var DBG = ctx.DBG = msg.DBG, S = +new Date; CT = CT || S;
if(put['#'] && put['.']){ /*root && root.on('put', msg);*/ return } // TODO: BUG! This needs to call HAM instead.
DBG && (DBG.p = S);
ctx['#'] = msg['#'];
ctx.msg = msg;
ctx.all = 0;
ctx.stun = 1;
var nl = Object.keys(put);//.sort(); // TODO: This is unbounded operation, large graphs will be slower. Write our own CPU scheduled sort? Or somehow do it in below? Keys itself is not O(1) either, create ES5 shim over ?weak map? or custom which is constant.
console.STAT && console.STAT(S, ((DBG||ctx).pk = +new Date) - S, 'put sort');
var ni = 0, nj, kl, soul, node, states, err, tmp;
(function pop(o){
if(nj != ni){ nj = ni;
if(!(soul = nl[ni])){
console.STAT && console.STAT(S, ((DBG||ctx).pd = +new Date) - S, 'put');
fire(ctx);
return;
}
if(!(node = put[soul])){ err = ERR+cut(soul)+"no node." } else
if(!(tmp = node._)){ err = ERR+cut(soul)+"no meta." } else
if(soul !== tmp['#']){ err = ERR+cut(soul)+"soul not same." } else
if(!(states = tmp['>'])){ err = ERR+cut(soul)+"no state." }
kl = Object.keys(node||{}); // TODO: .keys( is slow
}
if(err){
msg.err = ctx.err = err; // invalid data should error and stun the message.
fire(ctx);
//console.log("handle error!", err) // handle!
return;
}
var i = 0, key; o = o || 0;
while(o++ < 9 && (key = kl[i++])){
if('_' === key){ continue }
var val = node[key], state = states[key];
if(u === state){ err = ERR+cut(key)+"on"+cut(soul)+"no state."; break }
if(!valid(val)){ err = ERR+cut(key)+"on"+cut(soul)+"bad "+(typeof val)+cut(val); break }
//ctx.all++; //ctx.ack[soul+key] = '';
ham(val, key, soul, state, msg);
++C; // courtesy count;
}
if((kl = kl.slice(i)).length){ turn(pop); return }
++ni; kl = null; pop(o);
}());
} Gun.on.put = put;
// TODO: MARK!!! clock below, reconnect sync, SEA certify wire merge, User.auth taking multiple times, // msg put, put, say ack, hear loop...
// WASIS BUG! local peer not ack. .off other people: .open
function ham(val, key, soul, state, msg){
var ctx = msg._||'', root = ctx.root, graph = root.graph, lot, tmp;
var vertex = graph[soul] || empty, was = state_is(vertex, key, 1), known = vertex[key];
var DBG = ctx.DBG; if(tmp = console.STAT){ if(!graph[soul] || !known){ tmp.has = (tmp.has || 0) + 1 } }
var now = State(), u;
if(state > now){
setTimeout(function(){ ham(val, key, soul, state, msg) }, (tmp = state - now) > MD? MD : tmp); // Max Defer 32bit. :(
console.STAT && console.STAT(((DBG||ctx).Hf = +new Date), tmp, 'future');
return;
}
if(state < was){ /*old;*/ if(true || !ctx.miss){ return } } // but some chains have a cache miss that need to re-fire. // TODO: Improve in future. // for AXE this would reduce rebroadcast, but GUN does it on message forwarding. // TURNS OUT CACHE MISS WAS NOT NEEDED FOR NEW CHAINS ANYMORE!!! DANGER DANGER DANGER, ALWAYS RETURN! (or am I missing something?)
if(!ctx.faith){ // TODO: BUG? Can this be used for cache miss as well? // Yes this was a bug, need to check cache miss for RAD tests, but should we care about the faith check now? Probably not.
if(state === was && (val === known || L(val) <= L(known))){ /*console.log("same");*/ /*same;*/ if(!ctx.miss){ return } } // same
}
ctx.stun++; // TODO: 'forget' feature in SEA tied to this, bad approach, but hacked in for now. Any changes here must update there.
var aid = msg['#']+ctx.all++, id = {toString: function(){ return aid }, _: ctx}; id.toJSON = id.toString; // this *trick* makes it compatible between old & new versions.
root.dup.track(id)['#'] = msg['#']; // fixes new OK acks for RPC like RTC.
DBG && (DBG.ph = DBG.ph || +new Date);
root.on('put', {'#': id, '@': msg['@'], put: {'#': soul, '.': key, ':': val, '>': state}, ok: msg.ok, _: ctx});
}
function map(msg){
var DBG; if(DBG = (msg._||'').DBG){ DBG.pa = +new Date; DBG.pm = DBG.pm || +new Date}
var eve = this, root = eve.as, graph = root.graph, ctx = msg._, put = msg.put, soul = put['#'], key = put['.'], val = put[':'], state = put['>'], id = msg['#'], tmp;
if((tmp = ctx.msg) && (tmp = tmp.put) && (tmp = tmp[soul])){ state_ify(tmp, key, state, val, soul) } // necessary! or else out messages do not get SEA transforms.
//var bytes = ((graph[soul]||'')[key]||'').length||1;
graph[soul] = state_ify(graph[soul], key, state, val, soul);
if(tmp = (root.next||'')[soul]){
//tmp.bytes = (tmp.bytes||0) + ((val||'').length||1) - bytes;
//if(tmp.bytes > 2**13){ Gun.log.once('byte-limit', "Note: In the future, GUN peers will enforce a ~4KB query limit. Please see https://gun.eco/docs/Page") }
tmp.on('in', msg)
}
fire(ctx);
eve.to.next(msg);
}
function fire(ctx, msg){ var root;
if(ctx.stop){ return }
if(!ctx.err && 0 < --ctx.stun){ return } // TODO: 'forget' feature in SEA tied to this, bad approach, but hacked in for now. Any changes here must update there.
ctx.stop = 1;
if(!(root = ctx.root)){ return }
var tmp = ctx.match; tmp.end = 1;
if(tmp === root.hatch){ if(!(tmp = ctx.latch) || tmp.end){ delete root.hatch } else { root.hatch = tmp } }
ctx.hatch && ctx.hatch(); // TODO: rename/rework how put & this interact.
setTimeout.each(ctx.match, function(cb){cb && cb()});
if(!(msg = ctx.msg) || ctx.err || msg.err){ return }
msg.out = universe;
ctx.root.on('out', msg);
CF(); // courtesy check;
}
function ack(msg){ // aggregate ACKs.
var id = msg['@'] || '', ctx, ok, tmp;
if(!(ctx = id._)){
var dup = (dup = msg.$) && (dup = dup._) && (dup = dup.root) && (dup = dup.dup);
if(!(dup = dup.check(id))){ return }
msg['@'] = dup['#'] || msg['@']; // This doesn't do anything anymore, backtrack it to something else?
return;
}
ctx.acks = (ctx.acks||0) + 1;
if(ctx.err = msg.err){
msg['@'] = ctx['#'];
fire(ctx); // TODO: BUG? How it skips/stops propagation of msg if any 1 item is error, this would assume a whole batch/resync has same malicious intent.
}
ctx.ok = msg.ok || ctx.ok;
if(!ctx.stop && !ctx.crack){ ctx.crack = ctx.match && ctx.match.push(function(){back(ctx)}) } // handle synchronous acks. NOTE: If a storage peer ACKs synchronously then the PUT loop has not even counted up how many items need to be processed, so ctx.STOP flags this and adds only 1 callback to the end of the PUT loop.
back(ctx);
}
function back(ctx){
if(!ctx || !ctx.root){ return }
if(ctx.stun || ctx.acks !== ctx.all){ return }
ctx.root.on('in', {'@': ctx['#'], err: ctx.err, ok: ctx.err? u : ctx.ok || {'':1}});
}
var ERR = "Error: Invalid graph!";
var cut = function(s){ return " '"+(''+s).slice(0,9)+"...' " }
var L = JSON.stringify, MD = 2147483647, State = Gun.state;
var C = 0, CT, CF = function(){if(C>999 && (C/-(CT - (CT = +new Date))>1)){Gun.window && console.log("Warning: You're syncing 1K+ records a second, faster than DOM can update - consider limiting query.");CF=function(){C=0}}};
}());
;(function(){
Gun.on.get = function(msg, gun){
var root = gun._, get = msg.get, soul = get['#'], node = root.graph[soul], has = get['.'];
var next = root.next || (root.next = {}), at = next[soul];
// TODO: Azarattum bug, what is in graph is not same as what is in next. Fix!
// queue concurrent GETs?
// TODO: consider tagging original message into dup for DAM.
// TODO: ^ above? In chat app, 12 messages resulted in same peer asking for `#user.pub` 12 times. (same with #user GET too, yipes!) // DAM note: This also resulted in 12 replies from 1 peer which all had same ##hash but none of them deduped because each get was different.
// TODO: Moving quick hacks fixing these things to axe for now.
// TODO: a lot of GET #foo then GET #foo."" happening, why?
// TODO: DAM's ## hash check, on same get ACK, producing multiple replies still, maybe JSON vs YSON?
// TMP note for now: viMZq1slG was chat LEX query #.
/*if(gun !== (tmp = msg.$) && (tmp = (tmp||'')._)){
if(tmp.Q){ tmp.Q[msg['#']] = ''; return } // chain does not need to ask for it again.
tmp.Q = {};
}*/
/*if(u === has){
if(at.Q){
//at.Q[msg['#']] = '';
//return;
}
at.Q = {};
}*/
var ctx = msg._||{}, DBG = ctx.DBG = msg.DBG;
DBG && (DBG.g = +new Date);
//console.log("GET:", get, node, has);
if(!node){ return root.on('get', msg) }
if(has){
if('string' != typeof has || u === node[has]){
if(!((at||'').next||'')[has]){ root.on('get', msg); return }
}
node = state_ify({}, has, state_is(node, has), node[has], soul);
// If we have a key in-memory, do we really need to fetch?
// Maybe... in case the in-memory key we have is a local write
// we still need to trigger a pull/merge from peers.
}
//Gun.window? Gun.obj.copy(node) : node; // HNPERF: If !browser bump Performance? Is this too dangerous to reference root graph? Copy / shallow copy too expensive for big nodes. Gun.obj.to(node); // 1 layer deep copy // Gun.obj.copy(node); // too slow on big nodes
node && ack(msg, node);
root.on('get', msg); // send GET to storage adapters.
}
function ack(msg, node){
var S = +new Date, ctx = msg._||{}, DBG = ctx.DBG = msg.DBG;
var to = msg['#'], id = text_rand(9), keys = Object.keys(node||'').sort(), soul = ((node||'')._||'')['#'], kl = keys.length, j = 0, root = msg.$._.root, F = (node === root.graph[soul]);
console.STAT && console.STAT(S, ((DBG||ctx).gk = +new Date) - S, 'got keys');
// PERF: Consider commenting this out to force disk-only reads for perf testing? // TODO: .keys( is slow
node && (function go(){
S = +new Date;
var i = 0, k, put = {}, tmp;
while(i < 9 && (k = keys[i++])){
state_ify(put, k, state_is(node, k), node[k], soul);
}
keys = keys.slice(i);
(tmp = {})[soul] = put; put = tmp;
var faith; if(F){ faith = function(){}; faith.ram = faith.faith = true; } // HNPERF: We're testing performance improvement by skipping going through security again, but this should be audited.
tmp = keys.length;
console.STAT && console.STAT(S, -(S - (S = +new Date)), 'got copied some');
DBG && (DBG.ga = +new Date);
root.on('in', {'@': to, '#': id, put: put, '%': (tmp? (id = text_rand(9)) : u), $: root.$, _: faith, DBG: DBG, FOO: 1});
console.STAT && console.STAT(S, +new Date - S, 'got in');
if(!tmp){ return }
setTimeout.turn(go);
}());
if(!node){ root.on('in', {'@': msg['#']}) } // TODO: I don't think I like this, the default lS adapter uses this but "not found" is a sensitive issue, so should probably be handled more carefully/individually.
} Gun.on.get.ack = ack;
}());
;(function(){
Gun.chain.opt = function(opt){
opt = opt || {};
var gun = this, at = gun._, tmp = opt.peers || opt;
if(!Object.plain(opt)){ opt = {} }
if(!Object.plain(at.opt)){ at.opt = opt }
if('string' == typeof tmp){ tmp = [tmp] }
if(!Object.plain(at.opt.peers)){ at.opt.peers = {}}
if(tmp instanceof Array){
opt.peers = {};
tmp.forEach(function(url){
var p = {}; p.id = p.url = url;
opt.peers[url] = at.opt.peers[url] = at.opt.peers[url] || p;
})
}
obj_each(opt, function each(k){ var v = this[k];
if((this && this.hasOwnProperty(k)) || 'string' == typeof v || Object.empty(v)){ this[k] = v; return }
if(v && v.constructor !== Object && !(v instanceof Array)){ return }
obj_each(v, each);
});
at.opt.from = opt;
Gun.on('opt', at);
at.opt.uuid = at.opt.uuid || function uuid(l){ return Gun.state().toString(36).replace('.','') + String.random(l||12) }
return gun;
}
}());
var obj_each = function(o,f){ Object.keys(o).forEach(f,o) }, text_rand = String.random, turn = setTimeout.turn, valid = Gun.valid, state_is = Gun.state.is, state_ify = Gun.state.ify, u, empty = {}, C;
Gun.log = function(){ return (!Gun.log.off && C.log.apply(C, arguments)), [].slice.call(arguments).join(' ') };
Gun.log.once = function(w,s,o){ return (o = Gun.log.once)[w] = o[w] || 0, o[w]++ || Gun.log(s) };
if(typeof window !== "undefined"){ (window.GUN = window.Gun = Gun).window = window }
try{ if(typeof MODULE !== "undefined"){ MODULE.exports = Gun } }catch(e){}
module.exports = Gun;
(Gun.window||{}).console = (Gun.window||{}).console || {log: function(){}};
(C = console).only = function(i, s){ return (C.only.i && i === C.only.i && C.only.i++) && (C.log.apply(C, arguments) || s) };
;"Please do not remove welcome log unless you are paying for a monthly sponsorship, thanks!";
Gun.log.once("welcome", "Hello wonderful person! :) Thanks for using GUN, please ask for help on http://chat.gun.eco if anything takes you longer than 5min to figure out!");
})(USE, './root');
;USE(function(module){
var Gun = USE('./root');
Gun.chain.back = function(n, opt){ var tmp;
n = n || 1;
if(-1 === n || Infinity === n){
return this._.root.$;
} else
if(1 === n){
return (this._.back || this._).$;
}
var gun = this, at = gun._;
if(typeof n === 'string'){
n = n.split('.');
}
if(n instanceof Array){
var i = 0, l = n.length, tmp = at;
for(i; i < l; i++){
tmp = (tmp||empty)[n[i]];
}
if(u !== tmp){
return opt? gun : tmp;
} else
if((tmp = at.back)){
return tmp.$.back(n, opt);
}
return;
}
if('function' == typeof n){
var yes, tmp = {back: at};
while((tmp = tmp.back)
&& u === (yes = n(tmp, opt))){}
return yes;
}
if('number' == typeof n){
return (at.back || at).$.back(n - 1);
}
return this;
}
var empty = {}, u;
})(USE, './back');
;USE(function(module){
// WARNING: GUN is very simple, but the JavaScript chaining API around GUN
// is complicated and was extremely hard to build. If you port GUN to another
// language, consider implementing an easier API to build.
var Gun = USE('./root');
Gun.chain.chain = function(sub){
var gun = this, at = gun._, chain = new (sub || gun).constructor(gun), cat = chain._, root;
cat.root = root = at.root;
cat.id = ++root.once;
cat.back = gun._;
cat.on = Gun.on;
cat.on('in', Gun.on.in, cat); // For 'in' if I add my own listeners to each then I MUST do it before in gets called. If I listen globally for all incoming data instead though, regardless of individual listeners, I can transform the data there and then as well.
cat.on('out', Gun.on.out, cat); // However for output, there isn't really the global option. I must listen by adding my own listener individually BEFORE this one is ever called.
return chain;
}
function output(msg){
var put, get, at = this.as, back = at.back, root = at.root, tmp;
if(!msg.$){ msg.$ = at.$ }
this.to.next(msg);
if(at.err){ at.on('in', {put: at.put = u, $: at.$}); return }
if(get = msg.get){
/*if(u !== at.put){
at.on('in', at);
return;
}*/
if(root.pass){ root.pass[at.id] = at; } // will this make for buggy behavior elsewhere?
if(at.lex){ Object.keys(at.lex).forEach(function(k){ tmp[k] = at.lex[k] }, tmp = msg.get = msg.get || {}) }
if(get['#'] || at.soul){
get['#'] = get['#'] || at.soul;
//root.graph[get['#']] = root.graph[get['#']] || {_:{'#':get['#'],'>':{}}};
msg['#'] || (msg['#'] = text_rand(9)); // A3120 ?
back = (root.$.get(get['#'])._);
if(!(get = get['.'])){ // soul
tmp = back.ask && back.ask['']; // check if we have already asked for the full node
(back.ask || (back.ask = {}))[''] = back; // add a flag that we are now.
if(u !== back.put){ // if we already have data,
back.on('in', back); // send what is cached down the chain
if(tmp){ return } // and don't ask for it again.
}
msg.$ = back.$;
} else
if(obj_has(back.put, get)){ // TODO: support #LEX !
tmp = back.ask && back.ask[get];
(back.ask || (back.ask = {}))[get] = back.$.get(get)._;
back.on('in', {get: get, put: {'#': back.soul, '.': get, ':': back.put[get], '>': state_is(root.graph[back.soul], get)}});
if(tmp){ return }
}
/*put = (back.$.get(get)._);
if(!(tmp = put.ack)){ put.ack = -1 }
back.on('in', {
$: back.$,
put: Gun.state.ify({}, get, Gun.state(back.put, get), back.put[get]),
get: back.get
});
if(tmp){ return }
} else
if('string' != typeof get){
var put = {}, meta = (back.put||{})._;
Gun.obj.map(back.put, function(v,k){
if(!Gun.text.match(k, get)){ return }
put[k] = v;
})
if(!Gun.obj.empty(put)){
put._ = meta;
back.on('in', {$: back.$, put: put, get: back.get})
}
if(tmp = at.lex){
tmp = (tmp._) || (tmp._ = function(){});
if(back.ack < tmp.ask){ tmp.ask = back.ack }
if(tmp.ask){ return }
tmp.ask = 1;
}
}
*/
root.ask(ack, msg); // A3120 ?
return root.on('in', msg);
}
//if(root.now){ root.now[at.id] = root.now[at.id] || true; at.pass = {} }
if(get['.']){
if(at.get){
msg = {get: {'.': at.get}, $: at.$};
(back.ask || (back.ask = {}))[at.get] = msg.$._; // TODO: PERFORMANCE? More elegant way?
return back.on('out', msg);
}
msg = {get: at.lex? msg.get : {}, $: at.$};
return back.on('out', msg);
}
(at.ask || (at.ask = {}))[''] = at; //at.ack = at.ack || -1;
if(at.get){
get['.'] = at.get;
(back.ask || (back.ask = {}))[at.get] = msg.$._; // TODO: PERFORMANCE? More elegant way?
return back.on('out', msg);
}
}
return back.on('out', msg);
}; Gun.on.out = output;
function input(msg, cat){ cat = cat || this.as; // TODO: V8 may not be able to optimize functions with different parameter calls, so try to do benchmark to see if there is any actual difference.
var root = cat.root, gun = msg.$ || (msg.$ = cat.$), at = (gun||'')._ || empty, tmp = msg.put||'', soul = tmp['#'], key = tmp['.'], change = (u !== tmp['='])? tmp['='] : tmp[':'], state = tmp['>'] || -Infinity, sat; // eve = event, at = data at, cat = chain at, sat = sub at (children chains).
if(u !== msg.put && (u === tmp['#'] || u === tmp['.'] || (u === tmp[':'] && u === tmp['=']) || u === tmp['>'])){ // convert from old format
if(!valid(tmp)){
if(!(soul = ((tmp||'')._||'')['#'])){ console.log("chain not yet supported for", tmp, '...', msg, cat); return; }
gun = cat.root.$.get(soul);
return setTimeout.each(Object.keys(tmp).sort(), function(k){ // TODO: .keys( is slow // BUG? ?Some re-in logic may depend on this being sync?
if('_' == k || u === (state = state_is(tmp, k))){ return }
cat.on('in', {$: gun, put: {'#': soul, '.': k, '=': tmp[k], '>': state}, VIA: msg});
});
}
cat.on('in', {$: at.back.$, put: {'#': soul = at.back.soul, '.': key = at.has || at.get, '=': tmp, '>': state_is(at.back.put, key)}, via: msg}); // TODO: This could be buggy! It assumes/approxes data, other stuff could have corrupted it.
return;
}
if((msg.seen||'')[cat.id]){ return } (msg.seen || (msg.seen = function(){}))[cat.id] = cat; // help stop some infinite loops
if(cat !== at){ // don't worry about this when first understanding the code, it handles changing contexts on a message. A soul chain will never have a different context.
Object.keys(msg).forEach(function(k){ tmp[k] = msg[k] }, tmp = {}); // make copy of message
tmp.get = cat.get || tmp.get;
if(!cat.soul && !cat.has){ // if we do not recognize the chain type
tmp.$$$ = tmp.$$$ || cat.$; // make a reference to wherever it came from.
} else
if(at.soul){ // a has (property) chain will have a different context sometimes if it is linked (to a soul chain). Anything that is not a soul or has chain, will always have different contexts.
tmp.$ = cat.$;
tmp.$$ = tmp.$$ || at.$;
}
msg = tmp; // use the message with the new context instead;
}
unlink(msg, cat);
if(((cat.soul/* && (cat.ask||'')['']*/) || msg.$$) && state >= state_is(root.graph[soul], key)){ // The root has an in-memory cache of the graph, but if our peer has asked for the data then we want a per deduplicated chain copy of the data that might have local edits on it.
(tmp = root.$.get(soul)._).put = state_ify(tmp.put, key, state, change, soul);
}
if(!at.soul /*&& (at.ask||'')['']*/ && state >= state_is(root.graph[soul], key) && (sat = (root.$.get(soul)._.next||'')[key])){ // Same as above here, but for other types of chains. // TODO: Improve perf by preventing echoes recaching.
sat.put = change; // update cache
if('string' == typeof (tmp = valid(change))){
sat.put = root.$.get(tmp)._.put || change; // share same cache as what we're linked to.
}
}
this.to && this.to.next(msg); // 1st API job is to call all chain listeners.
// TODO: Make input more reusable by only doing these (some?) calls if we are a chain we recognize? This means each input listener would be responsible for when listeners need to be called, which makes sense, as they might want to filter.
cat.any && setTimeout.each(Object.keys(cat.any), function(any){ (any = cat.any[any]) && any(msg) },0,99); // 1st API job is to call all chain listeners. // TODO: .keys( is slow // BUG: Some re-in logic may depend on this being sync.
cat.echo && setTimeout.each(Object.keys(cat.echo), function(lat){ (lat = cat.echo[lat]) && lat.on('in', msg) },0,99); // & linked at chains // TODO: .keys( is slow // BUG: Some re-in logic may depend on this being sync.
if(((msg.$$||'')._||at).soul){ // comments are linear, but this line of code is non-linear, so if I were to comment what it does, you'd have to read 42 other comments first... but you can't read any of those comments until you first read this comment. What!? // shouldn't this match link's check?
// is there cases where it is a $$ that we do NOT want to do the following?
if((sat = cat.next) && (sat = sat[key])){ // TODO: possible trick? Maybe have `ionmap` code set a sat? // TODO: Maybe we should do `cat.ask` instead? I guess does not matter.
tmp = {}; Object.keys(msg).forEach(function(k){ tmp[k] = msg[k] });
tmp.$ = (msg.$$||msg.$).get(tmp.get = key); delete tmp.$$; delete tmp.$$$;
sat.on('in', tmp);
}
}
link(msg, cat);
}; Gun.on.in = input;
function link(msg, cat){ cat = cat || this.as || msg.$._;
if(msg.$$ && this !== Gun.on){ return } // $$ means we came from a link, so we are at the wrong level, thus ignore it unless overruled manually by being called directly.
if(!msg.put || cat.soul){ return } // But you cannot overrule being linked to nothing, or trying to link a soul chain - that must never happen.
var put = msg.put||'', link = put['=']||put[':'], tmp;
var root = cat.root, tat = root.$.get(put['#']).get(put['.'])._;
if('string' != typeof (link = valid(link))){
if(this === Gun.on){ (tat.echo || (tat.echo = {}))[cat.id] = cat } // allow some chain to explicitly force linking to simple data.
return; // by default do not link to data that is not a link.
}
if((tat.echo || (tat.echo = {}))[cat.id] // we've already linked ourselves so we do not need to do it again. Except... (annoying implementation details)
&& !(root.pass||'')[cat.id]){ return } // if a new event listener was added, we need to make a pass through for it. The pass will be on the chain, not always the chain passed down.
if(tmp = root.pass){ if(tmp[link+cat.id]){ return } tmp[link+cat.id] = 1 } // But the above edge case may "pass through" on a circular graph causing infinite passes, so we hackily add a temporary check for that.
(tat.echo||(tat.echo={}))[cat.id] = cat; // set ourself up for the echo! // TODO: BUG? Echo to self no longer causes problems? Confirm.
if(cat.has){ cat.link = link }
var sat = root.$.get(tat.link = link)._; // grab what we're linking to.
(sat.echo || (sat.echo = {}))[tat.id] = tat; // link it.
var tmp = cat.ask||''; // ask the chain for what needs to be loaded next!
if(tmp[''] || cat.lex){ // we might need to load the whole thing // TODO: cat.lex probably has edge case bugs to it, need more test coverage.
sat.on('out', {get: {'#': link}});
}
setTimeout.each(Object.keys(tmp), function(get, sat){ // if sub chains are asking for data. // TODO: .keys( is slow // BUG? ?Some re-in logic may depend on this being sync?
if(!get || !(sat = tmp[get])){ return }
sat.on('out', {get: {'#': link, '.': get}}); // go get it.
},0,99);
}; Gun.on.link = link;
function unlink(msg, cat){ // ugh, so much code for seemingly edge case behavior.
var put = msg.put||'', change = (u !== put['='])? put['='] : put[':'], root = cat.root, link, tmp;
if(u === change){ // 1st edge case: If we have a brand new database, no data will be found.
// TODO: BUG! because emptying cache could be async from below, make sure we are not emptying a newer cache. So maybe pass an Async ID to check against?
// TODO: BUG! What if this is a map? // Warning! Clearing things out needs to be robust against sync/async ops, or else you'll see `map val get put` test catastrophically fail because map attempts to link when parent graph is streamed before child value gets set. Need to differentiate between lack acks and force clearing.
if(cat.soul && u !== cat.put){ return } // data may not be found on a soul, but if a soul already has data, then nothing can clear the soul as a whole.
//if(!cat.has){ return }
tmp = (msg.$$||msg.$||'')._||'';
if(msg['@'] && (u !== tmp.put || u !== cat.put)){ return } // a "not found" from other peers should not clear out data if we have already found it.
//if(cat.has && u === cat.put && !(root.pass||'')[cat.id]){ return } // if we are already unlinked, do not call again, unless edge case. // TODO: BUG! This line should be deleted for "unlink deeply nested".
if(link = cat.link || msg.linked){
delete (root.$.get(link)._.echo||'')[cat.id];
}
if(cat.has){ // TODO: Empty out links, maps, echos, acks/asks, etc.?
cat.link = null;
}
cat.put = u; // empty out the cache if, for example, alice's car's color no longer exists (relative to alice) if alice no longer has a car.
// TODO: BUG! For maps, proxy this so the individual sub is triggered, not all subs.
setTimeout.each(Object.keys(cat.next||''), function(get, sat){ // empty out all sub chains. // TODO: .keys( is slow // BUG? ?Some re-in logic may depend on this being sync? // TODO: BUG? This will trigger deeper put first, does put logic depend on nested order? // TODO: BUG! For map, this needs to be the isolated child, not all of them.
if(!(sat = cat.next[get])){ return }
//if(cat.has && u === sat.put && !(root.pass||'')[sat.id]){ return } // if we are already unlinked, do not call again, unless edge case. // TODO: BUG! This line should be deleted for "unlink deeply nested".
if(link){ delete (root.$.get(link).get(get)._.echo||'')[sat.id] }
sat.on('in', {get: get, put: u, $: sat.$}); // TODO: BUG? Add recursive seen check?
},0,99);
return;
}
if(cat.soul){ return } // a soul cannot unlink itself.
if(msg.$$){ return } // a linked chain does not do the unlinking, the sub chain does. // TODO: BUG? Will this cancel maps?
link = valid(change); // need to unlink anytime we are not the same link, though only do this once per unlink (and not on init).
tmp = msg.$._||'';
if(link === tmp.link || (cat.has && !tmp.link)){
if((root.pass||'')[cat.id] && 'string' !== typeof link){
} else {
return;
}
}
delete (tmp.echo||'')[cat.id];
unlink({get: cat.get, put: u, $: msg.$, linked: msg.linked = msg.linked || tmp.link}, cat); // unlink our sub chains.
}; Gun.on.unlink = unlink;
function ack(msg, ev){
//if(!msg['%'] && (this||'').off){ this.off() } // do NOT memory leak, turn off listeners! Now handled by .ask itself
// manhattan:
var as = this.as, at = as.$._, root = at.root, get = as.get||'', tmp = (msg.put||'')[get['#']]||'';
if(!msg.put || ('string' == typeof get['.'] && u === tmp[get['.']])){
if(u !== at.put){ return }
if(!at.soul && !at.has){ return } // TODO: BUG? For now, only core-chains will handle not-founds, because bugs creep in if non-core chains are used as $ but we can revisit this later for more powerful extensions.
at.ack = (at.ack || 0) + 1;
at.on('in', {
get: at.get,
put: at.put = u,
$: at.$,
'@': msg['@']
});
/*(tmp = at.Q) && setTimeout.each(Object.keys(tmp), function(id){ // TODO: Temporary testing, not integrated or being used, probably delete.
Object.keys(msg).forEach(function(k){ tmp[k] = msg[k] }, tmp = {}); tmp['@'] = id; // copy message
root.on('in', tmp);
}); delete at.Q;*/
return;
}
(msg._||{}).miss = 1;
Gun.on.put(msg);
return; // eom
}
var empty = {}, u, text_rand = String.random, valid = Gun.valid, obj_has = function(o, k){ return o && Object.prototype.hasOwnProperty.call(o, k) }, state = Gun.state, state_is = state.is, state_ify = state.ify;
})(USE, './chain');
;USE(function(module){
var Gun = USE('./root');
Gun.chain.get = function(key, cb, as){
var gun, tmp;
if(typeof key === 'string'){
if(key.length == 0) {
(gun = this.chain())._.err = {err: Gun.log('0 length key!', key)};
if(cb){ cb.call(gun, gun._.err) }
return gun;
}
var back = this, cat = back._;
var next = cat.next || empty;
if(!(gun = next[key])){
gun = key && cache(key, back);
}
gun = gun && gun.$;
} else
if('function' == typeof key){
if(true === cb){ return soul(this, key, cb, as), this }
gun = this;
var cat = gun._, opt = cb || {}, root = cat.root, id;
opt.at = cat;
opt.ok = key;
var wait = {}; // can we assign this to the at instead, like in once?
//var path = []; cat.$.back(at => { at.get && path.push(at.get.slice(0,9))}); path = path.reverse().join('.');
function any(msg, eve, f){
if(any.stun){ return }
if((tmp = root.pass) && !tmp[id]){ return }
var at = msg.$._, sat = (msg.$$||'')._, data = (sat||at).put, odd = (!at.has && !at.soul), test = {}, link, tmp;
if(odd || u === data){ // handles non-core
data = (u === ((tmp = msg.put)||'')['='])? (u === (tmp||'')[':'])? tmp : tmp[':'] : tmp['='];
}
if(link = ('string' == typeof (tmp = Gun.valid(data)))){
data = (u === (tmp = root.$.get(tmp)._.put))? opt.not? u : data : tmp;
}
if(opt.not && u === data){ return }
if(u === opt.stun){
if((tmp = root.stun) && tmp.on){
cat.$.back(function(a){ // our chain stunned?
tmp.on(''+a.id, test = {});
if((test.run || 0) < any.id){ return test } // if there is an earlier stun on gapless parents/self.
});
!test.run && tmp.on(''+at.id, test = {}); // this node stunned?
!test.run && sat && tmp.on(''+sat.id, test = {}); // linked node stunned?
if(any.id > test.run){
if(!test.stun || test.stun.end){
test.stun = tmp.on('stun');
test.stun = test.stun && test.stun.last;
}
if(test.stun && !test.stun.end){
//if(odd && u === data){ return }
//if(u === msg.put){ return } // "not found" acks will be found if there is stun, so ignore these.
(test.stun.add || (test.stun.add = {}))[id] = function(){ any(msg,eve,1) } // add ourself to the stun callback list that is called at end of the write.
return;
}
}
}
if(/*odd &&*/ u === data){ f = 0 } // if data not found, keep waiting/trying.
/*if(f && u === data){
cat.on('out', opt.out);
return;
}*/
if((tmp = root.hatch) && !tmp.end && u === opt.hatch && !f){ // quick hack! // What's going on here? Because data is streamed, we get things one by one, but a lot of developers would rather get a callback after each batch instead, so this does that by creating a wait list per chain id that is then called at the end of the batch by the hatch code in the root put listener.
if(wait[at.$._.id]){ return } wait[at.$._.id] = 1;
tmp.push(function(){any(msg,eve,1)});
return;
}; wait = {}; // end quick hack.
}
// call:
if(root.pass){ if(root.pass[id+at.id]){ return } root.pass[id+at.id] = 1 }
if(opt.on){ opt.ok.call(at.$, data, at.get, msg, eve || any); return } // TODO: Also consider breaking `this` since a lot of people do `=>` these days and `.call(` has slower performance.
if(opt.v2020){ opt.ok(msg, eve || any); return }
Object.keys(msg).forEach(function(k){ tmp[k] = msg[k] }, tmp = {}); msg = tmp; msg.put = data; // 2019 COMPATIBILITY! TODO: GET RID OF THIS!
opt.ok.call(opt.as, msg, eve || any); // is this the right
};
any.at = cat;
//(cat.any||(cat.any=function(msg){ setTimeout.each(Object.keys(cat.any||''), function(act){ (act = cat.any[act]) && act(msg) },0,99) }))[id = String.random(7)] = any; // maybe switch to this in future?
(cat.any||(cat.any={}))[id = String.random(7)] = any;
any.off = function(){ any.stun = 1; if(!cat.any){ return } delete cat.any[id] }
any.rid = rid; // logic from old version, can we clean it up now?
any.id = opt.run || ++root.once; // used in callback to check if we are earlier than a write. // will this ever cause an integer overflow?
tmp = root.pass; (root.pass = {})[id] = 1; // Explanation: test trade-offs want to prevent recursion so we add/remove pass flag as it gets fulfilled to not repeat, however map map needs many pass flags - how do we reconcile?
opt.out = opt.out || {get: {}};
cat.on('out', opt.out);
root.pass = tmp;
return gun;
} else
if('number' == typeof key){
return this.get(''+key, cb, as);
} else
if('string' == typeof (tmp = valid(key))){
return this.get(tmp, cb, as);
} else
if(tmp = this.get.next){
gun = tmp(this, key);
}
if(!gun){
(gun = this.chain())._.err = {err: Gun.log('Invalid get request!', key)}; // CLEAN UP
if(cb){ cb.call(gun, gun._.err) }
return gun;
}
if(cb && 'function' == typeof cb){
gun.get(cb, as);
}
return gun;
}
function cache(key, back){
var cat = back._, next = cat.next, gun = back.chain(), at = gun._;
if(!next){ next = cat.next = {} }
next[at.get = key] = at;
if(back === cat.root.$){
at.soul = key;
//at.put = {};
} else
if(cat.soul || cat.has){
at.has = key;
//if(obj_has(cat.put, key)){
//at.put = cat.put[key];
//}
}
return at;
}
function soul(gun, cb, opt, as){
var cat = gun._, acks = 0, tmp;
if(tmp = cat.soul || cat.link){ return cb(tmp, as, cat) }
if(cat.jam){ return cat.jam.push([cb, as]) }
cat.jam = [[cb,as]];
gun.get(function go(msg, eve){
if(u === msg.put && !cat.root.opt.super && (tmp = Object.keys(cat.root.opt.peers).length) && ++acks <= tmp){ // TODO: super should not be in core code, bring AXE up into core instead to fix? // TODO: .keys( is slow
return;
}
eve.rid(msg);
var at = ((at = msg.$) && at._) || {}, i = 0, as;
tmp = cat.jam; delete cat.jam; // tmp = cat.jam.splice(0, 100);
//if(tmp.length){ process.nextTick(function(){ go(msg, eve) }) }
while(as = tmp[i++]){ //Gun.obj.map(tmp, function(as, cb){
var cb = as[0], id; as = as[1];
cb && cb(id = at.link || at.soul || Gun.valid(msg.put) || ((msg.put||{})._||{})['#'], as, msg, eve);
} //);
}, {out: {get: {'.':true}}});
return gun;
}
function rid(at){
var cat = this.at || this.on;
if(!at || cat.soul || cat.has){ return this.off() }
if(!(at = (at = (at = at.$ || at)._ || at).id)){ return }
var map = cat.map, tmp, seen;
//if(!map || !(tmp = map[at]) || !(tmp = tmp.at)){ return }
if(tmp = (seen = this.seen || (this.seen = {}))[at]){ return true }
seen[at] = true;
return;
//tmp.echo[cat.id] = {}; // TODO: Warning: This unsubscribes ALL of this chain's listeners from this link, not just the one callback event.
//obj.del(map, at); // TODO: Warning: This unsubscribes ALL of this chain's listeners from this link, not just the one callback event.
return;