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add override function for loading & saving blockchain

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This commit is contained in:
Daniel Yrovas 2023-09-12 10:43:21 +10:00
parent 672d6daa8e
commit fd987ebe4a
1 changed files with 37 additions and 15 deletions
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50
blockchain/blockchain.js
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@ -5,7 +5,6 @@ const SensorRegistration = require('./sensor-registration');
const BrokerRegistration = require('./broker-registration');
const Integration = require('./integration');
const Compensation = require('./compensation');
const fs = require('fs');
const ChainUtil = require('../util/chain-util');
const RdsStore = require('./rds-store');
const {
@ -984,21 +983,9 @@ function findBlocksDifference(oldBlocks, newBlocks) {
};
}
function saveToDisk(blockchain, location) {
try {
fs.writeFileSync(
location,
blockchain.serialize());
} catch (err) {
console.log(`Couldn't save blockchain to disk: ${err}`);
return false;
}
return true;
}
function onChange(blockchain, newBlocks, oldBlocks, difference) {
if (blockchain.persisting !== null) {
saveToDisk(blockchain, blockchain.persisting);
Blockchain.saveToDisk(blockchain, blockchain.persisting);
}
for (const listener of blockchain.listeners) {
listener(newBlocks, oldBlocks, difference);
@ -1053,6 +1040,7 @@ class Blockchain {
}
static loadFromDisk(location) {
const fs = require('fs');
//possible race if deleted after check, but we live with it I guess
const returning = new Blockchain();
@ -1072,6 +1060,40 @@ class Blockchain {
return returning;
}
static saveToDisk(blockchain, location) {
const fs = require('fs');
try {
fs.writeFileSync(
location,
blockchain.serialize());
} catch (err) {
console.log(`Couldn't save blockchain to disk: ${err}`);
return false;
}
return true;
}
static loadFromDiskOverrideFS(location, saveChain, loadChain) {
Blockchain.saveToDisk = (blockchain, location) => {
saveChain(location, blockchain.serialize()); // async call, no result can be returned; must assume success.
return true;
}
Blockchain.loadFromDisk = (location) => {
const returning = new Blockchain();
returning.persisting = location;
const rawPersistedChain = loadChain(location); // sync call, because application has already loaded file,
// this simply retrieves it from memory
// TODO: Could add check for empty string to prevent error, however, result is the same so leaving for now.
const deserialized = Blockchain.deserialize(rawPersistedChain);
const replaceResult = returning.replaceChain(deserialized);
if (!replaceResult.result) {
console.log(`Couldn't deserialize chain at '${location}', starting from genesis: ${replaceResult.reason}`);
}
return returning;
}
return Blockchain.loadFromDisk(location);
}
//adds an existing block to the blockchain, returns false if the block can't be added, true if it was added
addBlock(newBlock) {