From 295c3866cb8fcbde65a366810db6f0d054abeb53 Mon Sep 17 00:00:00 2001
From: Scorbajio <indigophi@protonmail.com>
Date: Sat, 6 Aug 2022 01:56:35 +0000
Subject: [PATCH] Create account fetcher base

---
 .../client/lib/sync/fetcher/accountfetcher.ts | 195 ++++++++++++++++++
 1 file changed, 195 insertions(+)
 create mode 100644 packages/client/lib/sync/fetcher/accountfetcher.ts

diff --git a/packages/client/lib/sync/fetcher/accountfetcher.ts b/packages/client/lib/sync/fetcher/accountfetcher.ts
new file mode 100644
index 00000000000..ca670c27371
--- /dev/null
+++ b/packages/client/lib/sync/fetcher/accountfetcher.ts
@@ -0,0 +1,195 @@
+import { Fetcher, FetcherOptions } from './fetcher'
+import { Account } from '@ethereumjs/util'
+// import { Chain } from '../../blockchain'
+import { Job } from './types'
+import { Peer } from '../../net/peer'
+
+export interface AccountFetcherOptions extends FetcherOptions {
+	/** Root hash of the account trie to serve */
+	root: Buffer
+
+	/** Account hash of the first to retrieve */
+	origin: Buffer
+
+	/** Account hash after which to stop serving data */
+	limit: Buffer
+
+	/** Soft limit at which to stop returning data */
+	bytes: bigint
+
+	/** Destroy fetcher once all tasks are done */
+	destroyWhenDone?: boolean
+}
+
+// root comes from block?
+export type JobTask = {
+	root: Buffer
+	origin: Buffer
+	limit: Buffer
+	bytes: bigint
+}
+
+export class AccountFetcher<JobResult, StorageItem> extends Fetcher<
+	JobTask,
+	Account[],
+	Account
+> {
+	/**
+	 * Where the fetcher starts apart from the tasks already in the `in` queue.
+	 */
+	root: Buffer
+	/**
+	 * Account hash of the first to retrieve
+	 */
+	origin: Buffer
+	/**
+	 * Account hash after which to stop serving data
+	 */
+	limit: Buffer
+	/**
+	 * Soft limit at which to stop returning data
+	 */
+	bytes: bigint
+
+	/**
+	 * Create new block fetcher
+	 */
+	constructor(options: AccountFetcherOptions) {
+		super(options)
+
+		this.root = options.root
+		this.origin = options.origin
+		this.limit = options.limit
+		this.bytes = options.bytes
+		this.debug(
+			`Block fetcher instantiated root=${this.root} origin=${this.origin} limit=${this.limit} bytes=${this.bytes} destroyWhenDone=${this.destroyWhenDone}`
+		)
+	}
+
+	/**
+	 * Request results from peer for the given job.
+	 * Resolves with the raw result
+	 * If `undefined` is returned, re-queue the job.
+	 * @param job
+	 * @param peer
+	 */
+	async request(job: Job<JobTask, Account[], Account>, peer: Peer): Promise<Account[] | undefined> {
+		return
+	}
+
+	/**
+	 * Process the reply for the given job.
+	 * If the reply contains unexpected data, return `undefined`,
+	 * this re-queues the job.
+	 * @param job fetch job
+	 * @param result result data
+	 */
+	process(job: Job<JobTask, Account[], Account>, result: Account[]): Account[] | undefined {
+		return
+	}
+
+	/**
+	* Store fetch result. Resolves once store operation is complete.
+	* @param result fetch result
+	*/
+	async store(result: Account[]): Promise<void> {
+		return
+	}
+} import { Fetcher, FetcherOptions } from './fetcher'
+import { Account } from '@ethereumjs/util'
+// import { Chain } from '../../blockchain'
+import { Job } from './types'
+import { Peer } from '../../net/peer'
+
+export interface AccountFetcherOptions extends FetcherOptions {
+	/** Root hash of the account trie to serve */
+	root: Buffer
+
+	/** Account hash of the first to retrieve */
+	origin: Buffer
+
+	/** Account hash after which to stop serving data */
+	limit: Buffer
+
+	/** Soft limit at which to stop returning data */
+	bytes: bigint
+
+	/** Destroy fetcher once all tasks are done */
+	destroyWhenDone?: boolean
+}
+
+// root comes from block?
+export type JobTask = {
+	root: Buffer
+	origin: Buffer
+	limit: Buffer
+	bytes: bigint
+}
+
+export class AccountFetcher<JobResult, StorageItem> extends Fetcher<
+	JobTask,
+	Account[],
+	Account
+> {
+	/**
+	 * Where the fetcher starts apart from the tasks already in the `in` queue.
+	 */
+	root: Buffer
+	/**
+	 * Account hash of the first to retrieve
+	 */
+	origin: Buffer
+	/**
+	 * Account hash after which to stop serving data
+	 */
+	limit: Buffer
+	/**
+	 * Soft limit at which to stop returning data
+	 */
+	bytes: bigint
+
+	/**
+	 * Create new block fetcher
+	 */
+	constructor(options: AccountFetcherOptions) {
+		super(options)
+
+		this.root = options.root
+		this.origin = options.origin
+		this.limit = options.limit
+		this.bytes = options.bytes
+		this.debug(
+			`Block fetcher instantiated root=${this.root} origin=${this.origin} limit=${this.limit} bytes=${this.bytes} destroyWhenDone=${this.destroyWhenDone}`
+		)
+	}
+
+	/**
+	 * Request results from peer for the given job.
+	 * Resolves with the raw result
+	 * If `undefined` is returned, re-queue the job.
+	 * @param job
+	 * @param peer
+	 */
+	async request(job: Job<JobTask, Account[], Account>, peer: Peer): Promise<Account[] | undefined> {
+		return
+	}
+
+	/**
+	 * Process the reply for the given job.
+	 * If the reply contains unexpected data, return `undefined`,
+	 * this re-queues the job.
+	 * @param job fetch job
+	 * @param result result data
+	 */
+	process(job: Job<JobTask, Account[], Account>, result: Account[]): Account[] | undefined {
+		return
+	}
+
+	/**
+	* Store fetch result. Resolves once store operation is complete.
+	* @param result fetch result
+	*/
+	async store(result: Account[]): Promise<void> {
+		return
+	}
+} 
\ No newline at end of file