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smarter store update after replacing chains

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concurrent mining
validity checks for new transactions/blocks/metadata
rdf store stores quads
smarter clearing of transactions from pool when a new block is mined
change querying to be readonly and generic
moved some things around
This commit is contained in:
Josip Milovac 2022-12-20 11:26:06 +11:00
parent ea81105df6
commit b4c2a0c88d
7 changed files with 373 additions and 177 deletions
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49
blockchain/index.js
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@ -5,15 +5,37 @@ class Blockchain {
this.chain = [Block.genesis()];
}
addBlock(data) {
const block = Block.mineBlock(this.chain[this.chain.length-1], data);
this.chain.push(block);
//adds an existing block to the blockchain, returns false if the block can't be added, true if it was added
addBlock(newBlock) {
if (newBlock.lastHash !== this.chain[this.chain.length - 1].hash) {
console.log("Tried to add invalid block, last hash didn't match our last hash");
return false;
}
//how to check if new block's timestamp is believable
if (newBlock.difficulty !== Block.adjustDifficulty(this.chain[this.chain.length - 1], newBlock.timestamp)) {
console.log("Tried to add invalid block, difficulty is incorrect");
return false;
}
if (!Block.checkBlock(newBlock)) {
console.log("Tried to add invalid block, block's hash doesn't match its contents");
return false;
}
return block;
this.chain.push(newBlock);
console.log("Added new block: ");
//console.log(newBlock);
return true;
}
isValidChain(chain) {
if(JSON.stringify(chain[0]) !== JSON.stringify(Block.genesis())) return false;
if (chain.length === 0) {
return false;
}
if (JSON.stringify(chain[0]) !== JSON.stringify(Block.genesis())) {
return false;
}
for (let i=1; i<chain.length; i++) {
const block = chain[i];
@ -23,12 +45,15 @@ class Blockchain {
block.hash !== Block.blockHash(block)) {
return false;
}
if (!Block.checkBlock(block)) {
return false;
}
}
return true;
}
//return false on failure, true on success
//return null on fail, returns the index of where they differ
replaceChain(newChain) {
if (newChain.length <= this.chain.length) {
console.log('Received chain is not longer than the current chain.');
@ -39,8 +64,18 @@ class Blockchain {
}
console.log('Replacing blockchain with the new chain.');
const oldChain = this.chain;
this.chain = newChain;
return true;
//find where they differ
for (let i = 1; i < oldChain.length; ++i) {
if (oldChain[i].hash !== newChain[i].hash) {
return i;
}
}
//if they didn't differ in the length of the old chain, must be one after
return oldChain.length;
}
}