RanchiMall/fcoin
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

refactor/update nlr function; check nlr for spv wallet

Browse Source
This commit is contained in:
ohryan 2020-07-15 19:07:25 -07:00
parent 430276b592
commit 7a1816a3a8
1 changed files with 45 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
lib/blockchain/chain.js
View File

@ -855,36 +855,8 @@ class Chain extends AsyncEmitter {
assert(fork, 'No free space or data corruption.');
// Check NLR (No Large Reorganization)
if (tip.height - fork.height >= this.nlrLimit) {
if (this.nlrLimit !== 0) {
this.logger.warning(
'NLR Activated: current=%h(%d) fork=%h(%d) reorg_size=%d',
tip.hash,
tip.height,
competitor.hash,
competitor.height,
tip.height - fork.height
);
const entryWithMostWork = (tip.height > competitor.height) ? tip : competitor
// mark invalid_child from tip of fork to second block of fork
while (entryWithMostWork.height > fork.height + 2) {
const previous = await this.getPrevious(entryWithMostWork)
this.invalidate(previous.hash)
}
// mark invalid first block of fork
const previous = await this.getPrevious(entryWithMostWork)
this.invalidate(previous.hash)
// check
assert(this.getPrevious(previous), fork)
return true
}
}
// Check NLR
if (this.noLongReorg(tip, fork, competitor)) return true
// Blocks to disconnect.
const disconnect = [];
@ -943,6 +915,9 @@ class Chain extends AsyncEmitter {
assert(fork, 'No free space or data corruption.');
// Check NLR
if (this.noLongReorg(tip, fork, competitor)) return true
// Buffer disconnected blocks.
const disconnect = [];
let entry = tip;
@ -981,6 +956,46 @@ class Chain extends AsyncEmitter {
return this.emitAsync('reorganize', tip, competitor);
}
/**
* Checks if a reorganization breaks the set nlrLimit,
* if it does, it invalidates necessary blocks and returns true
* else return false
* @param {ChainEntry} tip - Current tip of this chain.
* @param {ChainEntry} fork - The tip of the fork.
* @param {ChainEntry} competitor - The competing chain's tip.
* @returns {Promise<boolean>}
*/
async noLongReorg (tip, fork, competitor) {
if (tip.height - fork.height >= this.network.nlrLimit) {
if (this.network.nlrLimit !== 0) {
this.logger.warning(
'NLR Activated: current=%h(%d) fork=%h(%d) reorg_size=%d',
tip.hash,
tip.height,
competitor.hash,
competitor.height,
tip.height - fork.height
);
// mark invalid_child from tip of fork to second block of fork
while (competitor.height > fork.height + 2) {
const previous = await this.getPrevious(competitor)
this.invalidate(previous.hash)
}
// mark invalid first block of fork
const previous = await this.getPrevious(competitor)
this.invalidate(previous.hash)
// check
assert(this.getPrevious(previous), fork)
return true
}
}
return false
}
/**
* Disconnect an entry from the chain (updates the tip).
* @param {ChainEntry} entry