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main_chain.js
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main_chain.js
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/*jslint node: true */
"use strict";
var _ = require('lodash');
var async = require('async');
var db = require('./db.js');
var constants = require("./constants.js");
var storage = require('./storage.js');
var graph = require('./graph.js');
var objectHash = require("./object_hash.js");
var paid_witnessing = require("./paid_witnessing.js");
var headers_commission = require("./headers_commission.js");
var mutex = require('./mutex.js');
var eventBus = require('./event_bus.js');
var profiler = require('./profiler.js');
var breadcrumbs = require('./breadcrumbs.js');
var conf = require('./conf.js');
var kvstore = require('./kvstore.js');
var string_utils = require('./string_utils.js');
// override when adding units which caused witnessed level to significantly retreat
var arrRetreatingUnits = [
'+5ntioHT58jcFb8oVc+Ff4UvO5UvYGRcrGfYIofGUW8=',
'C/aPdM0sODPLC3NqJPWdZlqmV8B4xxf2N/+HSEi0sKU=',
'sSev6hvQU86SZBemy9CW2lJIko2jZDoY55Lm3zf2QU4=',
'19GglT3uZx1WmfWstLb3yIa85jTic+t01Kpe6s5gTTA=',
'Hyi2XVdZ/5D3H/MhwDL/jRWHp3F/dQTmwemyUHW+Urg=',
'xm0kFeKh6uqSXx6UUmc2ucgsNCU5h/e6wxSMWirhOTo='
];
function updateMainChain(conn, batch, from_unit, last_added_unit, bKeepStabilityPoint, onDone){
var arrAllParents = [];
var arrNewMcUnits = [];
// if unit === null, read free balls
function findNextUpMainChainUnit(unit, handleUnit){
function handleProps(props){
if (props.best_parent_unit === null)
throw Error("best parent is null");
console.log("unit "+unit+", best parent "+props.best_parent_unit+", wlevel "+props.witnessed_level);
handleUnit(props.best_parent_unit);
}
function readLastUnitProps(handleLastUnitProps){
conn.query("SELECT unit AS best_parent_unit, witnessed_level \n\
FROM units WHERE is_free=1 \n\
ORDER BY witnessed_level DESC, \n\
level-witnessed_level ASC, \n\
unit ASC \n\
LIMIT 5",
function(rows){
if (rows.length === 0)
throw Error("no free units?");
if (rows.length > 1){
var arrParents = rows.map(function(row){ return row.best_parent_unit; });
arrAllParents = arrParents;
for (var i=0; i<arrRetreatingUnits.length; i++){
var n = arrParents.indexOf(arrRetreatingUnits[i]);
if (n >= 0)
return handleLastUnitProps(rows[n]);
}
}
/*
// override when adding +5ntioHT58jcFb8oVc+Ff4UvO5UvYGRcrGfYIofGUW8= which caused witnessed level to significantly retreat
if (rows.length === 2 && (rows[1].best_parent_unit === '+5ntioHT58jcFb8oVc+Ff4UvO5UvYGRcrGfYIofGUW8=' || rows[1].best_parent_unit === 'C/aPdM0sODPLC3NqJPWdZlqmV8B4xxf2N/+HSEi0sKU=' || rows[1].best_parent_unit === 'sSev6hvQU86SZBemy9CW2lJIko2jZDoY55Lm3zf2QU4=') && (rows[0].best_parent_unit === '3XJT1iK8FpFeGjwWXd9+Yu7uJp7hM692Sfbb5zdqWCE=' || rows[0].best_parent_unit === 'TyY/CY8xLGvJhK6DaBumj2twaf4y4jPC6umigAsldIA=' || rows[0].best_parent_unit === 'VKX2Nsx2W1uQYT6YajMGHAntwNuSMpAAlxF7Y98tKj8='))
return handleLastUnitProps(rows[1]);
*/
handleLastUnitProps(rows[0]);
}
);
}
unit ? storage.readStaticUnitProps(conn, unit, handleProps) : readLastUnitProps(handleProps);
}
function goUpFromUnit(unit){
if (storage.isGenesisUnit(unit))
return checkNotRebuildingStableMainChainAndGoDown(0, unit);
profiler.start();
findNextUpMainChainUnit(unit, function(best_parent_unit){
storage.readUnitProps(conn, best_parent_unit, function(objBestParentUnitProps){
var objBestParentUnitProps2 = storage.assocUnstableUnits[best_parent_unit] || storage.assocStableUnits[best_parent_unit];
if (!objBestParentUnitProps2){
if (storage.isGenesisUnit(best_parent_unit))
objBestParentUnitProps2 = storage.assocStableUnits[best_parent_unit];
else
throw Error("unstable unit not found: "+best_parent_unit);
}
var objBestParentUnitProps2ForCheck = _.clone(objBestParentUnitProps2);
delete objBestParentUnitProps2ForCheck.parent_units;
delete objBestParentUnitProps2ForCheck.bAA;
var objBestParentUnitPropsForCheck = _.clone(objBestParentUnitProps);
delete objBestParentUnitPropsForCheck.bAA;
delete objBestParentUnitPropsForCheck.parent_units;
if (!storage.isGenesisUnit(best_parent_unit))
delete objBestParentUnitProps2ForCheck.earned_headers_commission_recipients;
if (!conf.bFaster && !_.isEqual(objBestParentUnitProps2ForCheck, objBestParentUnitPropsForCheck))
throwError("different props, db: "+JSON.stringify(objBestParentUnitProps)+", unstable: "+JSON.stringify(objBestParentUnitProps2));
if (!objBestParentUnitProps.is_on_main_chain)
conn.query("UPDATE units SET is_on_main_chain=1, main_chain_index=NULL WHERE unit=?", [best_parent_unit], function(){
objBestParentUnitProps2.is_on_main_chain = 1;
objBestParentUnitProps2.main_chain_index = null;
arrNewMcUnits.push(best_parent_unit);
profiler.stop('mc-goUpFromUnit');
goUpFromUnit(best_parent_unit);
});
else{
profiler.stop('mc-goUpFromUnit');
if (unit === null)
updateLatestIncludedMcIndex(objBestParentUnitProps.main_chain_index, false);
else
checkNotRebuildingStableMainChainAndGoDown(objBestParentUnitProps.main_chain_index, best_parent_unit);
}
});
});
}
function checkNotRebuildingStableMainChainAndGoDown(last_main_chain_index, last_main_chain_unit){
console.log("checkNotRebuildingStableMainChainAndGoDown "+from_unit);
profiler.start();
conn.query(
"SELECT unit FROM units WHERE is_on_main_chain=1 AND main_chain_index>? AND is_stable=1",
[last_main_chain_index],
function(rows){
profiler.stop('mc-checkNotRebuilding');
if (rows.length > 0)
throw Error("removing stable units "+rows.map(function(row){return row.unit}).join(', ')+" from MC after adding "+last_added_unit+" with all parents "+arrAllParents.join(', '));
goDownAndUpdateMainChainIndex(last_main_chain_index, last_main_chain_unit);
}
);
}
function goDownAndUpdateMainChainIndex(last_main_chain_index, last_main_chain_unit){
profiler.start();
conn.query(
//"UPDATE units SET is_on_main_chain=0, main_chain_index=NULL WHERE is_on_main_chain=1 AND main_chain_index>?",
"UPDATE units SET is_on_main_chain=0, main_chain_index=NULL WHERE main_chain_index>?",
[last_main_chain_index],
function(){
for (var unit in storage.assocUnstableUnits){
var o = storage.assocUnstableUnits[unit];
if (o.main_chain_index > last_main_chain_index){
o.is_on_main_chain = 0;
o.main_chain_index = null;
}
}
var main_chain_index = last_main_chain_index;
var main_chain_unit = last_main_chain_unit;
conn.cquery(
"SELECT unit FROM units WHERE is_on_main_chain=1 AND main_chain_index IS NULL ORDER BY level",
function(rows){
if (!conf.bFaster && rows.length === 0){
//if (last_main_chain_index > 0)
throw Error("no unindexed MC units after adding "+last_added_unit);
//else{
// console.log("last MC=0, no unindexed MC units");
// return updateLatestIncludedMcIndex(last_main_chain_index, true);
//}
}
arrNewMcUnits.reverse();
if (!conf.bFaster){
var arrDbNewMcUnits = rows.map(function(row){ return row.unit; });
if (!_.isEqual(arrNewMcUnits, arrDbNewMcUnits))
throwError("different new MC units, arr: "+JSON.stringify(arrNewMcUnits)+", db: "+JSON.stringify(arrDbNewMcUnits));
}
async.eachSeries(
conf.bFaster ? arrNewMcUnits : arrDbNewMcUnits,
function(mc_unit, cb){
main_chain_index++;
var arrUnits = [mc_unit];
function goUp(arrStartUnits){
conn.cquery(
"SELECT DISTINCT unit \n\
FROM parenthoods JOIN units ON parent_unit=unit \n\
WHERE child_unit IN(?) AND main_chain_index IS NULL",
[arrStartUnits],
function(rows){
var arrNewStartUnits2 = [];
arrStartUnits.forEach(function(start_unit){
storage.assocUnstableUnits[start_unit].parent_units.forEach(function(parent_unit){
if (storage.assocUnstableUnits[parent_unit] && storage.assocUnstableUnits[parent_unit].main_chain_index === null && arrNewStartUnits2.indexOf(parent_unit) === -1)
arrNewStartUnits2.push(parent_unit);
});
});
var arrNewStartUnits = conf.bFaster ? arrNewStartUnits2 : rows.map(function(row){ return row.unit; });
if (!conf.bFaster && !_.isEqual(arrNewStartUnits.sort(), arrNewStartUnits2.sort()))
throwError("different new start units, arr: "+JSON.stringify(arrNewStartUnits2)+", db: "+JSON.stringify(arrNewStartUnits));
if (arrNewStartUnits.length === 0)
return updateMc();
arrUnits = arrUnits.concat(arrNewStartUnits);
goUp(arrNewStartUnits);
}
);
}
function updateMc(){
arrUnits.forEach(function(unit){
storage.assocUnstableUnits[unit].main_chain_index = main_chain_index;
});
var strUnitList = arrUnits.map(db.escape).join(', ');
conn.query("UPDATE units SET main_chain_index=? WHERE unit IN("+strUnitList+")", [main_chain_index], function(){
conn.query("UPDATE unit_authors SET _mci=? WHERE unit IN("+strUnitList+")", [main_chain_index], function(){
cb();
});
});
}
goUp(arrUnits);
},
function(err){
console.log("goDownAndUpdateMainChainIndex done");
if (err)
throw Error("goDownAndUpdateMainChainIndex eachSeries failed");
conn.query(
(conf.storage === 'mysql')
? "UPDATE units LEFT JOIN unit_authors USING(unit) SET _mci=NULL WHERE main_chain_index IS NULL"
: "UPDATE unit_authors SET _mci=NULL WHERE unit IN(SELECT unit FROM units WHERE main_chain_index IS NULL)",
function(){
profiler.stop('mc-goDown');
updateLatestIncludedMcIndex(last_main_chain_index, true);
}
);
}
);
}
);
}
);
}
function updateLatestIncludedMcIndex(last_main_chain_index, bRebuiltMc){
function checkAllLatestIncludedMcIndexesAreSet(){
profiler.start();
if (!conf.bFaster && !_.isEqual(assocDbLimcisByUnit, assocLimcisByUnit))
throwError("different LIMCIs, mem: "+JSON.stringify(assocLimcisByUnit)+", db: "+JSON.stringify(assocDbLimcisByUnit));
conn.query("SELECT unit FROM units WHERE latest_included_mc_index IS NULL AND level!=0", function(rows){
if (rows.length > 0)
throw Error(rows.length+" units have latest_included_mc_index=NULL, e.g. unit "+rows[0].unit);
profiler.stop('mc-limci-check');
updateStableMcFlag();
});
}
function propagateLIMCI(){
console.log("propagateLIMCI "+last_main_chain_index);
profiler.start();
// the 1st condition in WHERE is the same that was used 2 queries ago to NULL limcis
conn.query(
/*
"UPDATE units AS punits \n\
JOIN parenthoods ON punits.unit=parent_unit \n\
JOIN units AS chunits ON child_unit=chunits.unit \n\
SET chunits.latest_included_mc_index=punits.latest_included_mc_index \n\
WHERE (chunits.main_chain_index > ? OR chunits.main_chain_index IS NULL) \n\
AND (chunits.latest_included_mc_index IS NULL OR chunits.latest_included_mc_index < punits.latest_included_mc_index)",
[last_main_chain_index],
function(result){
(result.affectedRows > 0) ? propagateLIMCI() : checkAllLatestIncludedMcIndexesAreSet();
}
*/
"SELECT punits.latest_included_mc_index, chunits.unit \n\
FROM units AS punits \n\
JOIN parenthoods ON punits.unit=parent_unit \n\
JOIN units AS chunits ON child_unit=chunits.unit \n\
WHERE (chunits.main_chain_index > ? OR chunits.main_chain_index IS NULL) \n\
AND (chunits.latest_included_mc_index IS NULL OR chunits.latest_included_mc_index < punits.latest_included_mc_index)",
[last_main_chain_index],
function(rows){
profiler.stop('mc-limci-select-propagate');
if (rows.length === 0)
return checkAllLatestIncludedMcIndexesAreSet();
profiler.start();
async.eachSeries(
rows,
function(row, cb){
assocDbLimcisByUnit[row.unit] = row.latest_included_mc_index;
conn.query("UPDATE units SET latest_included_mc_index=? WHERE unit=?", [row.latest_included_mc_index, row.unit], function(){cb();});
},
function(){
profiler.stop('mc-limci-update-propagate');
propagateLIMCI();
}
);
}
);
}
function loadUnitProps(unit, handleProps){
if (storage.assocUnstableUnits[unit])
return handleProps(storage.assocUnstableUnits[unit]);
storage.readUnitProps(conn, unit, handleProps);
}
function calcLIMCIs(onUpdated){
console.log("will calcLIMCIs for " + Object.keys(assocChangedUnits).length + " changed units");
var arrFilledUnits = [];
async.forEachOfSeries(
assocChangedUnits,
function(props, unit, cb){
var max_limci = -1;
async.eachSeries(
props.parent_units,
function(parent_unit, cb2){
loadUnitProps(parent_unit, function(parent_props){
if (parent_props.is_on_main_chain){
props.latest_included_mc_index = parent_props.main_chain_index;
assocLimcisByUnit[unit] = props.latest_included_mc_index;
arrFilledUnits.push(unit);
return cb2('done');
}
if (parent_props.latest_included_mc_index === null)
return cb2('parent limci not known yet');
if (parent_props.latest_included_mc_index > max_limci)
max_limci = parent_props.latest_included_mc_index;
cb2();
});
},
function(err){
if (err)
return cb();
if (max_limci < 0)
throw Error("max limci < 0 for unit "+unit);
props.latest_included_mc_index = max_limci;
assocLimcisByUnit[unit] = props.latest_included_mc_index;
arrFilledUnits.push(unit);
cb();
}
);
},
function(){
arrFilledUnits.forEach(function(unit){
delete assocChangedUnits[unit];
});
if (Object.keys(assocChangedUnits).length > 0)
calcLIMCIs(onUpdated);
else
onUpdated();
}
);
}
console.log("updateLatestIncludedMcIndex "+last_main_chain_index);
if (!conf.bFaster)
profiler.start();
var assocChangedUnits = {};
var assocLimcisByUnit = {};
var assocDbLimcisByUnit = {};
for (var unit in storage.assocUnstableUnits){
var o = storage.assocUnstableUnits[unit];
if (o.main_chain_index > last_main_chain_index || o.main_chain_index === null){
o.latest_included_mc_index = null;
assocChangedUnits[unit] = o;
}
}
calcLIMCIs(function(){
console.log("calcLIMCIs done");
if (conf.bFaster){
return async.forEachOfSeries(
assocLimcisByUnit,
function(limci, unit, cb){
conn.query("UPDATE units SET latest_included_mc_index=? WHERE unit=?", [limci, unit], function(){ cb(); });
},
checkAllLatestIncludedMcIndexesAreSet
);
}
conn.query("UPDATE units SET latest_included_mc_index=NULL WHERE main_chain_index>? OR main_chain_index IS NULL", [last_main_chain_index], function(res){
console.log("update LIMCI=NULL done, matched rows: "+res.affectedRows);
profiler.stop('mc-limci-set-null');
profiler.start();
conn.query(
// if these units have other parents, they cannot include later MC units (otherwise, the parents would've been redundant).
// the 2nd condition in WHERE is the same that was used 1 query ago to NULL limcis.
// I had to rewrite this single query because sqlite doesn't support JOINs in UPDATEs
/*
"UPDATE units AS punits \n\
JOIN parenthoods ON punits.unit=parent_unit \n\
JOIN units AS chunits ON child_unit=chunits.unit \n\
SET chunits.latest_included_mc_index=punits.main_chain_index \n\
WHERE punits.is_on_main_chain=1 \n\
AND (chunits.main_chain_index > ? OR chunits.main_chain_index IS NULL) \n\
AND chunits.latest_included_mc_index IS NULL",
[last_main_chain_index],
function(result){
if (result.affectedRows === 0 && bRebuiltMc)
throw "no latest_included_mc_index updated";
propagateLIMCI();
}
*/
"SELECT chunits.unit, punits.main_chain_index \n\
FROM units AS punits \n\
JOIN parenthoods ON punits.unit=parent_unit \n\
JOIN units AS chunits ON child_unit=chunits.unit \n\
WHERE punits.is_on_main_chain=1 \n\
AND (chunits.main_chain_index > ? OR chunits.main_chain_index IS NULL) \n\
AND chunits.latest_included_mc_index IS NULL",
[last_main_chain_index],
function(rows){
console.log(rows.length+" rows");
profiler.stop('mc-limci-select-initial');
profiler.start();
if (rows.length === 0 && bRebuiltMc)
throw Error("no latest_included_mc_index updated, last_mci="+last_main_chain_index+", affected="+res.affectedRows);
async.eachSeries(
rows,
function(row, cb){
console.log(row.main_chain_index, row.unit);
assocDbLimcisByUnit[row.unit] = row.main_chain_index;
conn.query("UPDATE units SET latest_included_mc_index=? WHERE unit=?", [row.main_chain_index, row.unit], function(){ cb(); });
},
function(){
profiler.stop('mc-limci-update-initial');
propagateLIMCI();
}
);
}
);
});
});
}
function readLastStableMcUnit(handleLastStableMcUnit){
conn.query("SELECT unit FROM units WHERE is_on_main_chain=1 AND is_stable=1 ORDER BY main_chain_index DESC LIMIT 1", function(rows){
if (rows.length === 0)
throw Error("no units on stable MC?");
handleLastStableMcUnit(rows[0].unit);
});
}
function findMinMcWitnessedLevel(tip_unit, first_unstable_mc_level, first_unstable_mc_index, arrWitnesses, handleMinMcWl){
var _arrWitnesses = arrWitnesses;
var arrCollectedWitnesses = [];
var min_mc_wl = Number.POSITIVE_INFINITY;
function addWitnessesAndGoUp(start_unit){
storage.readStaticUnitProps(conn, start_unit, function(props){
var best_parent_unit = props.best_parent_unit;
var level = props.level;
if (level === null)
throw Error("null level in findMinMcWitnessedLevel");
if (level < first_unstable_mc_level) {
console.log("unit " + start_unit + ", level=" + level + ", first_unstable_mc_level=" + first_unstable_mc_level + ", min_mc_wl=" + min_mc_wl);
return handleMinMcWl(-1);
}
storage.readUnitAuthors(conn, start_unit, function(arrAuthors){
for (var i=0; i<arrAuthors.length; i++){
var address = arrAuthors[i];
if (_arrWitnesses.indexOf(address) !== -1 && arrCollectedWitnesses.indexOf(address) === -1) {
arrCollectedWitnesses.push(address);
var witnessed_level = props.witnessed_level;
if (min_mc_wl > witnessed_level)
min_mc_wl = witnessed_level;
}
}
(arrCollectedWitnesses.length < constants.MAJORITY_OF_WITNESSES)
? addWitnessesAndGoUp(best_parent_unit) : handleMinMcWl(min_mc_wl);
});
});
}
if (first_unstable_mc_index > constants.lastBallStableInParentsUpgradeMci)
return addWitnessesAndGoUp(tip_unit);
// use old algo for old units
storage.readWitnesses(conn, tip_unit, function(arrTipUnitWitnesses){
_arrWitnesses = arrTipUnitWitnesses;
addWitnessesAndGoUp(tip_unit);
});
}
function updateStableMcFlag(){
profiler.start();
if (bKeepStabilityPoint)
return finish();
console.log("updateStableMcFlag");
readLastStableMcUnit(function(last_stable_mc_unit){
console.log("last stable mc unit "+last_stable_mc_unit);
storage.readWitnesses(conn, last_stable_mc_unit, function(arrWitnesses){
conn.query("SELECT unit, is_on_main_chain, main_chain_index, level FROM units WHERE best_parent_unit=?", [last_stable_mc_unit], function(rows){
if (rows.length === 0){
//if (isGenesisUnit(last_stable_mc_unit))
// return finish();
throw Error("no best children of last stable MC unit "+last_stable_mc_unit+"?");
}
var arrMcRows = rows.filter(function(row){ return (row.is_on_main_chain === 1); }); // only one element
var arrAltRows = rows.filter(function(row){ return (row.is_on_main_chain === 0); });
if (arrMcRows.length !== 1)
throw Error("not a single MC child?");
var first_unstable_mc_unit = arrMcRows[0].unit;
var first_unstable_mc_index = arrMcRows[0].main_chain_index;
var first_unstable_mc_level = arrMcRows[0].level;
var arrAltBranchRootUnits = arrAltRows.map(function(row){ return row.unit; });
function advanceLastStableMcUnitAndTryNext(){
profiler.stop('mc-stableFlag');
markMcIndexStable(conn, batch, first_unstable_mc_index, updateStableMcFlag);
}
if (first_unstable_mc_index > constants.lastBallStableInParentsUpgradeMci) {
var arrFreeUnits = [];
for (var unit in storage.assocUnstableUnits)
if (storage.assocUnstableUnits[unit].is_free === 1)
arrFreeUnits.push(unit);
determineIfStableInLaterUnits(conn, first_unstable_mc_unit, arrFreeUnits, function (bStable) {
console.log(first_unstable_mc_unit + ' stable in free units ' + arrFreeUnits.join(', ') + ' ? ' + bStable);
bStable ? advanceLastStableMcUnitAndTryNext() : finish();
});
return;
}
conn.query("SELECT unit FROM units WHERE is_free=1 AND is_on_main_chain=1", function(tip_rows){
if (tip_rows.length !== 1)
throw Error("not a single mc tip");
// this is the level when we colect 7 witnesses if walking up the MC from its end
var tip_unit = tip_rows[0].unit;
findMinMcWitnessedLevel(tip_unit, first_unstable_mc_level, first_unstable_mc_index, arrWitnesses,
function(min_mc_wl){
console.log("minimum witnessed level "+min_mc_wl);
if (min_mc_wl == -1)
return finish();
if (arrAltBranchRootUnits.length === 0){ // no alt branches
if (min_mc_wl >= first_unstable_mc_level)
return advanceLastStableMcUnitAndTryNext();
return finish();
/*
// if there are 12 witnesses on the MC, the next unit is stable
// This is not reliable. Adding a new unit after this one (not descending from this one)
// could change the MC near the tip and route the MC away from a witness-authored unit, thus decreasing the count below 12
conn.query(
"SELECT COUNT(DISTINCT address) AS count_witnesses FROM units JOIN unit_authors USING(unit) \n\
WHERE is_on_main_chain=1 AND main_chain_index>=? AND address IN(?)",
[first_unstable_mc_index, arrWitnesses],
function(count_witnesses_rows){
(count_witnesses_rows[0].count_witnesses === constants.COUNT_WITNESSES)
? advanceLastStableMcUnitAndTryNext() : finish();
}
);
return;
*/
}
createListOfBestChildren(arrAltBranchRootUnits, function(arrAltBestChildren){
determineMaxAltLevel(
conn, first_unstable_mc_index, first_unstable_mc_level, arrAltBestChildren, arrWitnesses,
function(max_alt_level){
if (min_mc_wl > max_alt_level)
return advanceLastStableMcUnitAndTryNext();
console.log('--- with branches - unstable');
if (arrAllParents.length <= 1) // single free unit
return finish();
console.log('--- will try tip parent '+tip_unit);
determineIfStableInLaterUnits(conn, first_unstable_mc_unit, [tip_unit], function (bStable) {
console.log('---- tip only: '+bStable);
bStable ? advanceLastStableMcUnitAndTryNext() : finish();
});
}
);
});
}
);
});
});
});
});
}
// also includes arrParentUnits
function createListOfBestChildren(arrParentUnits, handleBestChildrenList){
if (arrParentUnits.length === 0)
return handleBestChildrenList([]);
var arrBestChildren = arrParentUnits.slice();
function goDownAndCollectBestChildren(arrStartUnits, cb){
conn.query("SELECT unit, is_free FROM units WHERE best_parent_unit IN(?)", [arrStartUnits], function(rows){
if (rows.length === 0)
return cb();
//console.log("unit", arrStartUnits, "best children:", rows.map(function(row){ return row.unit; }), "free units:", rows.reduce(function(sum, row){ return sum+row.is_free; }, 0));
async.eachSeries(
rows,
function(row, cb2){
arrBestChildren.push(row.unit);
if (row.is_free === 1)
cb2();
else
goDownAndCollectBestChildren([row.unit], cb2);
},
cb
);
});
}
goDownAndCollectBestChildren(arrParentUnits, function(){
handleBestChildrenList(arrBestChildren);
});
}
function finish(){
profiler.stop('mc-stableFlag');
console.log("done updating MC\n");
if (onDone)
onDone();
}
console.log("\nwill update MC");
/*if (from_unit === null && arrRetreatingUnits.indexOf(last_added_unit) >= 0){
conn.query("UPDATE units SET is_on_main_chain=1, main_chain_index=NULL WHERE unit=?", [last_added_unit], function(){
goUpFromUnit(last_added_unit);
});
}
else*/
goUpFromUnit(from_unit);
}
/*
// climbs up along best parent links up, returns list of units encountered with level >= min_level
function createListOfPrivateMcUnits(start_unit, min_level, handleList){
var arrUnits = [];
function goUp(unit){
conn.query(
"SELECT best_parent_unit, level FROM units WHERE unit=?", [unit],
function(rows){
if (rows.length !== 1)
throw "createListOfPrivateMcUnits: not 1 row";
var row = rows[0];
if (row.level < min_level)
return handleList(arrUnits);
arrUnits.push(unit);
goUp(row.best_parent_unit);
}
);
}
goUp(start_unit);
}
*/
function readBestChildrenProps(conn, arrUnits, handleResult){
if (arrUnits.every(function(unit){ return !!storage.assocUnstableUnits[unit]; })){
var arrProps = [];
arrUnits.forEach(function(unit){
if (storage.assocBestChildren[unit])
arrProps = arrProps.concat(storage.assocBestChildren[unit]);
});
return handleResult(arrProps);
}
conn.query("SELECT unit, is_on_main_chain, main_chain_index, level, is_free FROM units WHERE best_parent_unit IN(?)", [arrUnits], function(rows){
if (arrUnits.every(function(unit){ return !!storage.assocUnstableUnits[unit]; })){
var arrProps = [];
arrUnits.forEach(function(unit){
if (storage.assocBestChildren[unit])
arrProps = arrProps.concat(storage.assocBestChildren[unit]);
});
if (!arraysEqual(_.sortBy(rows, 'unit'), _.sortBy(arrProps, 'unit'), ['unit', 'is_on_main_chain', 'main_chain_index', 'level', 'is_free']))
throwError("different best children of "+arrUnits.join(', ')+": db "+JSON.stringify(rows)+", mem "+JSON.stringify(arrProps));
}
handleResult(rows);
});
}
function arraysEqual(arr1, arr2, fields){
if (arr1.length !== arr2.length)
return false;
for (var i=0; i<arr1.length; i++)
for (var j=0; j<fields.length; j++)
if (arr1[i][fields[i]] !== arr2[i][fields[i]])
return false;
return true;
}
function determineMaxAltLevel(conn, first_unstable_mc_index, first_unstable_mc_level, arrAltBestChildren, arrWitnesses, handleResult){
// console.log('============= alt branch children\n', arrAltBestChildren.join('\n'));
// Compose a set S of units that increase WL, that is their own WL is greater than that of every parent.
// In this set, find max L. Alt WL will never reach it. If min_mc_wl > L, next MC unit is stable.
// Also filter the set S to include only those units that are conformant with the last stable MC unit.
if (first_unstable_mc_index >= constants.altBranchByBestParentUpgradeMci){
conn.query(
"SELECT MAX(bpunits.level) AS max_alt_level \n\
FROM units \n\
CROSS JOIN units AS bpunits \n\
ON units.best_parent_unit=bpunits.unit AND bpunits.witnessed_level < units.witnessed_level \n\
WHERE units.unit IN("+arrAltBestChildren.map(db.escape).join(', ')+")",
function(max_alt_rows){
var max_alt_level = max_alt_rows[0].max_alt_level; // can be null
// console.log('===== min_mc_wl='+min_mc_wl+', max_alt_level='+max_alt_level+", first_unstable_mc_level="+first_unstable_mc_level);
handleResult(max_alt_level || first_unstable_mc_level);
}
);
}
else{
// this sql query is totally wrong but we still leave it for compatibility
conn.query(
"SELECT MAX(units.level) AS max_alt_level \n\
FROM units \n\
LEFT JOIN parenthoods ON units.unit=child_unit \n\
LEFT JOIN units AS punits ON parent_unit=punits.unit AND punits.witnessed_level >= units.witnessed_level \n\
WHERE units.unit IN("+arrAltBestChildren.map(db.escape).join(', ')+") AND punits.unit IS NULL AND ( \n\
SELECT COUNT(*) \n\
FROM unit_witnesses \n\
WHERE unit_witnesses.unit IN(units.unit, units.witness_list_unit) AND unit_witnesses.address IN(?) \n\
)>=?",
[arrWitnesses, constants.COUNT_WITNESSES - constants.MAX_WITNESS_LIST_MUTATIONS],
function(max_alt_rows){
if (max_alt_rows.length !== 1)
throw Error("not a single max alt level");
var max_alt_level = max_alt_rows[0].max_alt_level;
// console.log('===== min_mc_wl='+min_mc_wl+', max_alt_level='+max_alt_level+", first_unstable_mc_level="+first_unstable_mc_level);
handleResult(max_alt_level);
}
);
}
}
function determineIfStableInLaterUnitsWithMaxLastBallMciFastPath(conn, earlier_unit, arrLaterUnits, handleResult) {
if (storage.isGenesisUnit(earlier_unit))
return handleResult(true);
storage.readUnitProps(conn, earlier_unit, function (objEarlierUnitProps) {
if (objEarlierUnitProps.is_free === 1 || objEarlierUnitProps.main_chain_index === null)
return handleResult(false);
storage.readMaxLastBallMci(conn, arrLaterUnits, function (max_last_ball_mci) {
if (objEarlierUnitProps.main_chain_index <= max_last_ball_mci)
return handleResult(true);
determineIfStableInLaterUnits(conn, earlier_unit, arrLaterUnits, handleResult);
});
});
}
function determineIfStableInLaterUnits(conn, earlier_unit, arrLaterUnits, handleResult){
if (storage.isGenesisUnit(earlier_unit))
return handleResult(true);
// hack to workaround past validation error
if (earlier_unit === 'LGFzduLJNQNzEqJqUXdkXr58wDYx77V8WurDF3+GIws=' && arrLaterUnits.join(',') === '6O4t3j8kW0/Lo7n2nuS8ITDv2UbOhlL9fF1M6j/PrJ4='
|| earlier_unit === 'VLdMzBDVpwqu+3OcZrBrmkT0aUb/mZ0O1IveDmGqIP0=' && arrLaterUnits.join(',') === 'pAfErVAA5CSPeh1KoLidDTgdt5Blu7k2rINtxVTMq4k='
|| earlier_unit === 'P2gqiei+7dur/gS1KOFHg0tiEq2+7l321AJxM3o0f5Q=' && arrLaterUnits.join(',') === '9G8kctAVAiiLf4/cyU2f4gdtD+XvKd1qRp0+k3qzR8o='
|| constants.bTestnet && earlier_unit === 'zAytsscSjo+N9dQ/VLio4ZDgZS91wfUk0IOnzzrXcYU=' && arrLaterUnits.join(',') === 'ZSQgpR326LEU4jW+1hQ5ZwnHAVnGLV16Kyf/foVeFOc='
|| constants.bTestnet && ['XbS1+l33sIlcBQ//2/ZyPsRV7uhnwOPvvuQ5IzB+vC0=', 'TMTkvkXOL8CxnuDzw36xDWI6bO5PrhicGLBR3mwrAxE=', '7s8y/32r+3ew1jmunq1ZVyH+MQX9HUADZDHu3otia9U='].indexOf(earlier_unit) >= 0 && arrLaterUnits.indexOf('39SDVpHJuzdDChPRerH0bFQOE5sudJCndQTaD4H8bms=') >= 0
|| constants.bTestnet && earlier_unit === 'N6Va5P0GgJorezFzwHiZ5HuF6p6HhZ29rx+eebAu0J0=' && arrLaterUnits.indexOf('mKwL1PTcWY783sHiCuDRcb6nojQAkwbeSL/z2a7uE6g=') >= 0
)
return handleResult(true);
var start_time = Date.now();
storage.readPropsOfUnits(conn, earlier_unit, arrLaterUnits, function(objEarlierUnitProps, arrLaterUnitProps){
if (constants.bTestnet && objEarlierUnitProps.main_chain_index <= 1220148 && objEarlierUnitProps.is_on_main_chain && arrLaterUnits.indexOf('qwKGj0w8P/jscAyQxSOSx2sUZCRFq22hsE6bSiqgUyk=') >= 0)
return handleResult(true);
if (objEarlierUnitProps.is_free === 1 || objEarlierUnitProps.main_chain_index === null)
return handleResult(false);
var max_later_limci = Math.max.apply(
null, arrLaterUnitProps.map(function(objLaterUnitProps){ return objLaterUnitProps.latest_included_mc_index; }));
if (max_later_limci < objEarlierUnitProps.main_chain_index) // the earlier unit is actually later
return handleResult(false);
var max_later_level = Math.max.apply(
null, arrLaterUnitProps.map(function(objLaterUnitProps){ return objLaterUnitProps.level; }));
var max_later_witnessed_level = Math.max.apply(
null, arrLaterUnitProps.map(function(objLaterUnitProps){ return objLaterUnitProps.witnessed_level; }));
readBestParentAndItsWitnesses(conn, earlier_unit, function(best_parent_unit, arrWitnesses){
conn.query("SELECT unit, is_on_main_chain, main_chain_index, level FROM units WHERE best_parent_unit=?", [best_parent_unit], function(rows){
if (rows.length === 0)
throw Error("no best children of "+best_parent_unit+"?");
var arrMcRows = rows.filter(function(row){ return (row.is_on_main_chain === 1); }); // only one element
var arrAltRows = rows.filter(function(row){ return (row.is_on_main_chain === 0); });
if (arrMcRows.length !== 1)
throw Error("not a single MC child?");
var first_unstable_mc_unit = arrMcRows[0].unit;
if (first_unstable_mc_unit !== earlier_unit)
throw Error("first unstable MC unit is not our input unit");
var first_unstable_mc_index = arrMcRows[0].main_chain_index;
var first_unstable_mc_level = arrMcRows[0].level;
var arrAltBranchRootUnits = arrAltRows.map(function(row){ return row.unit; });
//console.log("first_unstable_mc_index", first_unstable_mc_index);
//console.log("first_unstable_mc_level", first_unstable_mc_level);
//console.log("alt", arrAltBranchRootUnits);
function findMinMcWitnessedLevel(handleMinMcWl){
createListOfBestChildrenIncludedByLaterUnits([first_unstable_mc_unit], function(arrBestChildren){
conn.query( // if 2 witnesses authored the same unit, unit_authors will be joined 2 times and counted twice
"SELECT witnessed_level, address \n\
FROM units \n\
CROSS JOIN unit_authors USING(unit) \n\
WHERE unit IN("+arrBestChildren.map(db.escape).join(', ')+") AND address IN(?) \n\
ORDER BY witnessed_level DESC",
[arrWitnesses],
function(rows){
var arrCollectedWitnesses = [];
var min_mc_wl = -1;
for (var i=0; i<rows.length; i++){
var row = rows[i];
if (arrCollectedWitnesses.indexOf(row.address) === -1){
arrCollectedWitnesses.push(row.address);
if (arrCollectedWitnesses.length >= constants.MAJORITY_OF_WITNESSES){
min_mc_wl = row.witnessed_level;
break;
}
}
}
// var min_mc_wl = rows[constants.MAJORITY_OF_WITNESSES-1].witnessed_level;
if (first_unstable_mc_index > constants.branchedMinMcWlUpgradeMci){
if (min_mc_wl === -1) {
console.log("couldn't collect 7 witnesses, earlier unit "+earlier_unit+", best children "+arrBestChildren.join(', ')+", later "+arrLaterUnits.join(', ')+", witnesses "+arrWitnesses.join(', ')+", collected witnesses "+arrCollectedWitnesses.join(', '));
return handleMinMcWl(null);
}
return handleMinMcWl(min_mc_wl);
}
// it might be more optimistic because it collects 7 witness units, not 7 units posted by _different_ witnesses
findMinMcWitnessedLevelOld(function(old_min_mc_wl){
var diff = min_mc_wl - old_min_mc_wl;
console.log("---------- new min_mc_wl="+min_mc_wl+", old min_mc_wl="+old_min_mc_wl+", diff="+diff+", later "+arrLaterUnits.join(', '));
// if (diff < 0)
// throw Error("new min_mc_wl="+min_mc_wl+", old min_mc_wl="+old_min_mc_wl+", diff="+diff+" for earlier "+earlier_unit+", later "+arrLaterUnits.join(', '));
handleMinMcWl(Math.max(old_min_mc_wl, min_mc_wl));
});
}
);
});
}
function findMinMcWitnessedLevelOld(handleMinMcWl){
var min_mc_wl = Number.MAX_VALUE;
var count = 0;
function goUp(start_unit){
conn.query(
"SELECT best_parent_unit, witnessed_level, \n\
(SELECT COUNT(*) FROM unit_authors WHERE unit_authors.unit=units.unit AND address IN(?)) AS count \n\
FROM units WHERE unit=?", [arrWitnesses, start_unit],
function(rows){
if (rows.length !== 1)
throw Error("findMinMcWitnessedLevelOld: not 1 row");
var row = rows[0];
if (row.count > 0 && row.witnessed_level < min_mc_wl)
min_mc_wl = row.witnessed_level;
count += row.count; // this is a bug, should count only unique witnesses
(count < constants.MAJORITY_OF_WITNESSES) ? goUp(row.best_parent_unit) : handleMinMcWl(min_mc_wl);
}
);
}
conn.query(
"SELECT witnessed_level, best_parent_unit, \n\
(SELECT COUNT(*) FROM unit_authors WHERE unit_authors.unit=units.unit AND address IN(?)) AS count \n\
FROM units \n\
WHERE unit IN(?) \n\
ORDER BY witnessed_level DESC, \n\
level-witnessed_level ASC, \n\
unit ASC \n\
LIMIT 1",
[arrWitnesses, arrLaterUnits],
function(rows){
var row = rows[0];
if (row.count > 0)
min_mc_wl = row.witnessed_level;
count += row.count;
goUp(row.best_parent_unit);
}
);
}
function determineIfHasAltBranches(handleHasAltBranchesResult){
if (arrAltBranchRootUnits.length === 0)
return handleHasAltBranchesResult(false);
// check if alt branches are included by later units
async.eachSeries(
arrAltBranchRootUnits,
function(alt_root_unit, cb){
graph.determineIfIncludedOrEqual(conn, alt_root_unit, arrLaterUnits, function(bIncluded){
bIncluded ? cb("included") : cb();
});
},
function(err){
handleHasAltBranchesResult(err ? true : false);
}
);
}
// also includes arrAltBranchRootUnits
function createListOfBestChildrenIncludedByLaterUnits(arrAltBranchRootUnits, handleBestChildrenList){
if (arrAltBranchRootUnits.length === 0)
return handleBestChildrenList([]);
var arrBestChildren = [];
var arrTips = [];
var arrNotIncludedTips = [];
var arrRemovedBestChildren = [];
function goDownAndCollectBestChildrenOld(arrStartUnits, cb){
conn.query("SELECT unit, is_free, main_chain_index FROM units WHERE best_parent_unit IN(?)", [arrStartUnits], function(rows){
if (rows.length === 0)
return cb();
async.eachSeries(
rows,
function(row, cb2){
function addUnit(){
arrBestChildren.push(row.unit);
if (row.is_free === 1 || arrLaterUnits.indexOf(row.unit) >= 0)
cb2();
else
goDownAndCollectBestChildrenOld([row.unit], cb2);
}
if (row.main_chain_index !== null && row.main_chain_index <= max_later_limci)
addUnit();
else
graph.determineIfIncludedOrEqual(conn, row.unit, arrLaterUnits, function(bIncluded){
bIncluded ? addUnit() : cb2();
});
},
cb
);
});
}
function goDownAndCollectBestChildrenFast(arrStartUnits, cb){
readBestChildrenProps(conn, arrStartUnits, function(rows){
if (rows.length === 0){
arrStartUnits.forEach(function(start_unit){
arrTips.push(start_unit);
});
return cb();
}
var count = arrBestChildren.length;
async.eachSeries(
rows,
function(row, cb2){
arrBestChildren.push(row.unit);
if (arrLaterUnits.indexOf(row.unit) >= 0)
cb2();
else if (
row.is_free === 1
|| row.level >= max_later_level
|| row.witnessed_level > max_later_witnessed_level && first_unstable_mc_index >= constants.witnessedLevelMustNotRetreatFromAllParentsUpgradeMci
|| row.latest_included_mc_index > max_later_limci
|| row.is_on_main_chain && row.main_chain_index > max_later_limci
){
arrTips.push(row.unit);
arrNotIncludedTips.push(row.unit);
cb2();
}
else {
if (count % 100 === 0)
return setImmediate(goDownAndCollectBestChildrenFast, [row.unit], cb2);
goDownAndCollectBestChildrenFast([row.unit], cb2);
}
},
function () {
(count % 100 === 0) ? setImmediate(cb) : cb();
}
);
});
}
function findBestChildrenNotIncludedInLaterUnits(arrUnits, cb){
var arrUnitsToRemove = [];
async.eachSeries(
arrUnits,
function(unit, cb2){
if (arrRemovedBestChildren.indexOf(unit) >= 0)
return cb2();
if (arrNotIncludedTips.indexOf(unit) >= 0){
arrUnitsToRemove.push(unit);
return cb2();
}
graph.determineIfIncludedOrEqual(conn, unit, arrLaterUnits, function(bIncluded){
if (!bIncluded)
arrUnitsToRemove.push(unit);
cb2();
});
},
function(){
if (arrUnitsToRemove.length === 0)
return cb();
arrRemovedBestChildren = arrRemovedBestChildren.concat(arrUnitsToRemove);
goUp(arrUnitsToRemove, cb);
}
);
}
function goUp(arrCurrentTips, cb){
var arrUnits = [];
async.eachSeries(
arrCurrentTips,
function(unit, cb2){
storage.readStaticUnitProps(conn, unit, function(props){
if (arrUnits.indexOf(props.best_parent_unit) === -1)
arrUnits.push(props.best_parent_unit);
cb2();
});