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https://github.com/hackku21/loc-chain-backend.git
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Merge branch 'main' of github.com:hackku21/loc-chain-backend into main
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commit
46131e2219
@ -4,6 +4,8 @@ import {LocalFilesystem, LocalFilesystemConfig} from "@extollo/util"
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export default {
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debug: env('DEBUG_MODE', false),
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base_url: env('BASE_URL', 'http://localhost:8000/'),
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session: {
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/* The implementation of @extollo/lib.Session that serves as the session backend. */
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driver: MemorySession,
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@ -58,6 +58,7 @@ export interface BlockResourceItem extends FirebaseResourceItem {
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proof: string; // the generated proof-of-work string
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timestamp: number; // millisecond unix timestamp when this block was created
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waitTime: number; // number of milliseconds between last block and this one
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peer: string; // the host URL of the peer that submitted this block
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}
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/**
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@ -29,6 +29,7 @@ export class Block implements BlockResourceItem {
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lastBlockUUID: string
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proof: string
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waitTime: number
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peer: string
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get config(): Config {
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return Application.getApplication().make(Config)
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@ -44,6 +45,7 @@ export class Block implements BlockResourceItem {
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this.proof = rec.proof
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this.timestamp = rec.timestamp
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this.waitTime = rec.waitTime
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this.peer = rec.peer
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}
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/** Returns true if this is the genesis block. */
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@ -86,6 +88,7 @@ export class Block implements BlockResourceItem {
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proof: this.proof,
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timestamp: this.timestamp,
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waitTime: this.waitTime,
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peer: this.peer,
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}
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}
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@ -116,6 +119,11 @@ export interface Peer {
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*/
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@Singleton()
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export class Blockchain extends Unit {
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private readonly MIN_WAIT_TIME = 1000
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private readonly MAX_WAIT_TIME = 5000
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private readonly PENALTY_INTERVAL = 500
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private readonly MAX_PEERS_PENALTY = 10
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@Inject()
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protected readonly logging!: Logging
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@ -240,6 +248,7 @@ export class Blockchain extends Unit {
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const peers = await this.getPeers()
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const time_x_block: {[key: string]: Block} = {}
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const time_x_blocks: {[key: string]: Block[]} = {}
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const time_x_peer: {[key: string]: Peer | true} = {}
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for ( const peer of peers ) {
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@ -248,7 +257,15 @@ export class Blockchain extends Unit {
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const block = blocks.reverse()[0]
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if ( !block || block.seqID === validSeqID || !block.seqID ) continue
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const penalty = blocks.slice(0, 10)
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.map(block => block.peer === peer.host)
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.filter(Boolean).length * this.PENALTY_INTERVAL
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* (Math.min(peers.length, this.MAX_PEERS_PENALTY))
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block.waitTime += penalty
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time_x_block[block.waitTime] = block
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time_x_blocks[block.waitTime] = blocks
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time_x_peer[block.waitTime] = peer
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}
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}
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@ -266,11 +283,15 @@ export class Blockchain extends Unit {
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const block = time_x_block[min]
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const peer = time_x_peer[min]
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await (<BlockResource>this.app().make(BlockResource)).push(block)
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if ( peer === true ) {
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this.pendingSubmit = undefined
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this.pendingTransactions = []
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await (<BlockResource>this.app().make(BlockResource)).push(block)
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} else {
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await this.firebase.ref('block').transaction((_) => {
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return time_x_blocks[min].map(x => x.toItem())
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})
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this.pendingSubmit = undefined
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await this.attemptSubmit()
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}
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@ -292,7 +313,7 @@ export class Blockchain extends Unit {
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public async attemptSubmit() {
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if ( !this.pendingSubmit && this.pendingTransactions.length ) {
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const lastBlock = await this.getLastBlock()
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const waitTime = this.random(3000, 5000)
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const waitTime = this.random(this.MIN_WAIT_TIME, this.MAX_WAIT_TIME)
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const proof = await this.generateProofOfWork(lastBlock, waitTime)
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const block: BlockResourceItem = {
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@ -303,6 +324,7 @@ export class Blockchain extends Unit {
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lastBlockUUID: lastBlock!.uuid,
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proof,
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waitTime,
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peer: this.getBaseURL(),
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firebaseID: '',
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seqID: -1,
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@ -404,6 +426,7 @@ export class Blockchain extends Unit {
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firebaseID: '',
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seqID: -1,
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waitTime: 0,
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peer: this.getBaseURL(),
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})
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}
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@ -483,6 +506,16 @@ export class Blockchain extends Unit {
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return !!(await result.signatures?.[0]?.verified)
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}
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/**
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* Get the base URL that identifies this peer.
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* This should be the endpoint used to fetch the submitted blockchain.
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* @protected
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*/
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protected getBaseURL(): string {
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const base = this.config.get('server.base_url')
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return `${base}${base.endsWith('/') ? '' : '/'}api/v1/chain/submit`
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}
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/** Sleep for (roughly) the given number of milliseconds. */
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async sleep(ms: number) {
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await new Promise<void>(res => {
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