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20 Commits
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Author SHA1 Message Date
Derrick Hammer 4bad47c54c
refactor: don't wait on client sync 2023-10-28 22:02:06 -04:00
Derrick Hammer 0292c8c629
dep: update libethsync 2023-10-28 22:01:31 -04:00
Derrick Hammer 281869db4d
fix: update CONSENSUS_RPC_URL 2023-10-19 17:40:32 -04:00
Derrick Hammer c3d7a829a1
fix: update CONSENSUS_RPC_URL 2023-10-13 02:39:34 -04:00
Derrick Hammer 059c0b64ee
dep: update libethsync 2023-07-24 20:09:34 -04:00
Derrick Hammer 07ac024289
dep: update libethsync 2023-07-24 11:15:08 -04:00
Derrick Hammer 6b99aa5b2f
refactor: increase consensus_updates batch limit to 50 2023-07-15 06:36:36 -04:00
Derrick Hammer d24b0322fb
dep: update libethsync 2023-07-15 06:35:40 -04:00
Derrick Hammer a80f61b06f
refactor: reduce rpc methods to consensus_updates, consensus_optimistic_update, and execution_request 2023-07-14 00:01:42 -04:00
Derrick Hammer 9d80b557f6
dep: update libethsync 2023-07-14 00:00:39 -04:00
Derrick Hammer 7cdd7d9531
refactor: consensus_optimistic_update should return client.latestOptimisticUpdate if it is set or return an error 2023-07-12 02:23:32 -04:00
Derrick Hammer 2cd40af902
ci: setup 2023-07-11 18:25:05 -04:00
Derrick Hammer 07f8f81857
refactor: simplify logic and fix not returning a value 2023-07-11 18:24:32 -04:00
Derrick Hammer 3162dee81b
dep: update presetter-relay-plugin-preset 2023-07-11 03:56:53 -04:00
Derrick Hammer 0d88db7cb5
refactor: move to new @lumeweb/libethsync library and cleanup plugin 2023-07-11 03:55:23 -04:00
Derrick Hammer 2f5c27ce5d
fix: bls patch bugs in getImplementation 2023-07-11 03:54:45 -04:00
Derrick Hammer c64fe7c4ea
refactor: config structure has changed 2023-07-07 07:21:14 -04:00
Derrick Hammer ea8f2bc82a
refactor: switch to new build system 2023-07-07 07:20:50 -04:00
Derrick Hammer d630e2a181
fix: add patch for bls 2023-07-07 07:20:22 -04:00
Derrick Hammer 7ffc07f474
style: typecasting, formatting and cleanup 2023-07-07 07:18:32 -04:00
26 changed files with 23822 additions and 2497 deletions
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13
.github/workflows/ci.yml vendored Normal file
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@ -0,0 +1,13 @@
name: Build/Publish
on:
push:
branches:
- master
- develop
- develop-*
jobs:
main:
uses: lumeweb/github-node-deploy-workflow/.github/workflows/main.yml@master
secrets: inherit

5
.presetterrc.json Normal file
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@ -0,0 +1,5 @@
{
"preset": [
"@lumeweb/presetter-relay-plugin-preset"
]
}

9
build.js
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@ -1,9 +0,0 @@
import esbuild from "esbuild";
esbuild.buildSync({
entryPoints: ["src/index.ts"],
outfile: "dist/eth.js",
format: "cjs",
bundle: true,
platform: "node",
});

23647
npm-shrinkwrap.json generated Normal file
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File diff suppressed because it is too large Load Diff

21
package.json Normal file
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@ -0,0 +1,21 @@
{
"name": "@lumeweb/relay-plugin-eth",
"version": "0.1.0",
"type": "module",
"devDependencies": {
"@lumeweb/presetter-relay-plugin-preset": "^0.1.0-develop.9",
"patch-package": "^7.0.0",
"presetter": "^4.0.1"
},
"scripts": {
"prepare": "presetter bootstrap",
"build": "run build",
"semantic-release": "semantic-release",
"postinstall": "patch-package"
},
"dependencies": {
"@lumeweb/interface-relay": "^0.0.2-develop.1",
"@lumeweb/libethsync": "^0.1.0-develop.64",
"axios": "^1.4.0"
}
}

89
patches/@chainsafe+bls+7.1.1.patch Normal file
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@ -0,0 +1,89 @@
diff --git a/node_modules/@chainsafe/bls/lib/getImplementation.js b/node_modules/@chainsafe/bls/lib/getImplementation.js
index 9137cd4..ba8de8a 100644
--- a/node_modules/@chainsafe/bls/lib/getImplementation.js
+++ b/node_modules/@chainsafe/bls/lib/getImplementation.js
@@ -3,7 +3,7 @@ const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? p
export async function getImplementation(impl = "herumi") {
switch (impl) {
case "herumi": {
- return (await import("./herumi/index.js")).bls;
+ return (await import("./herumi/index.js")).bls();
}
case "blst-native":
// Lazy import native bindings to prevent automatically importing binding.node files
diff --git a/node_modules/@chainsafe/bls/lib/herumi/index.js b/node_modules/@chainsafe/bls/lib/herumi/index.js
index 4ed8fdd..f979984 100644
--- a/node_modules/@chainsafe/bls/lib/herumi/index.js
+++ b/node_modules/@chainsafe/bls/lib/herumi/index.js
@@ -1,16 +1,20 @@
-import { SecretKey } from "./secretKey.js";
-import { PublicKey } from "./publicKey.js";
-import { Signature } from "./signature.js";
-import { init, destroy } from "./context.js";
-import { functionalInterfaceFactory } from "../functional.js";
-await init();
-export * from "../constants.js";
-export { SecretKey, PublicKey, Signature, init, destroy };
-export const bls = {
- implementation: "herumi",
- SecretKey,
- PublicKey,
- Signature,
- ...functionalInterfaceFactory({ SecretKey, PublicKey, Signature }),
-};
-export default bls;
+import { SecretKey } from './secretKey.js'
+import { PublicKey } from './publicKey.js'
+import { Signature } from './signature.js'
+import { init, destroy } from './context.js'
+import { functionalInterfaceFactory } from '../functional.js'
+
+export * from '../constants.js'
+export { SecretKey, PublicKey, Signature, init, destroy }
+
+export const bls = async () => {
+ await init()
+ return {
+ implementation: 'herumi',
+ SecretKey,
+ PublicKey,
+ Signature,
+ ...functionalInterfaceFactory({ SecretKey, PublicKey, Signature }),
+ }
+}
+export default bls
diff --git a/node_modules/@chainsafe/bls/lib/index.d.ts b/node_modules/@chainsafe/bls/lib/index.d.ts
index 35a9432..097a938 100644
--- a/node_modules/@chainsafe/bls/lib/index.d.ts
+++ b/node_modules/@chainsafe/bls/lib/index.d.ts
@@ -1,3 +1,3 @@
import type { IBls } from "./types.js";
-declare let bls: IBls;
+export declare const bls: () => Promise<IBls>;
export default bls;
diff --git a/node_modules/@chainsafe/bls/lib/index.js b/node_modules/@chainsafe/bls/lib/index.js
index c2a5bdf..9572018 100644
--- a/node_modules/@chainsafe/bls/lib/index.js
+++ b/node_modules/@chainsafe/bls/lib/index.js
@@ -1,11 +1,14 @@
import { getImplementation } from "./getImplementation.js";
// Thanks https://github.com/iliakan/detect-node/blob/master/index.esm.js
const isNode = Object.prototype.toString.call(typeof process !== "undefined" ? process : 0) === "[object process]";
-let bls;
-try {
- bls = await getImplementation(isNode ? "blst-native" : "herumi");
-}
-catch (e) {
- bls = await getImplementation("herumi");
-}
+export const bls = async () => {
+ let bls;
+ try {
+ bls = await getImplementation(isNode ? "blst-native" : "herumi");
+ }
+ catch (e) {
+ bls = await getImplementation("herumi");
+ }
+ return bls;
+};
export default bls;

6
pkg/load-eth.json
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@ -1,3 +1,7 @@
{ {
"plugins": ["eth"] "core": {
"plugins": [
"eth"
]
}
} }

394
src/client/client.ts
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@ -1,394 +0,0 @@
import {
ClientConfig,
ExecutionInfo,
LightClientUpdate,
OptimisticUpdate,
VerifyWithReason,
} from "./types.js";
import { getDefaultClientConfig, handleGETRequest } from "./utils.js";
import { IProver, IStore } from "./interfaces.js";
import {
BEACON_SYNC_SUPER_MAJORITY,
DEFAULT_BATCH_SIZE,
POLLING_DELAY,
} from "./constants.js";
import {
computeSyncPeriodAtSlot,
getCurrentSlot,
} from "@lodestar/light-client/utils";
import {
assertValidLightClientUpdate,
assertValidSignedHeader,
} from "@lodestar/light-client/validation";
import { SyncCommitteeFast } from "@lodestar/light-client";
import bls, { init } from "@chainsafe/bls/switchable";
import { PublicKey } from "@chainsafe/bls/types.js";
import { fromHexString } from "@chainsafe/ssz";
import * as phase0 from "@lodestar/types/phase0";
import * as capella from "@lodestar/types/capella";
import NodeCache from "node-cache";
import { Mutex } from "async-mutex";
import { VerifyingProvider } from "./rpc/index.js";
import { ChainForkConfig } from "@lodestar/config";
import { allForks } from "@lodestar/types";
import {
BLOCK_BODY_EXECUTION_PAYLOAD_DEPTH as EXECUTION_PAYLOAD_DEPTH,
BLOCK_BODY_EXECUTION_PAYLOAD_INDEX as EXECUTION_PAYLOAD_INDEX,
} from "@lodestar/params";
export default class Client {
latestCommittee?: Uint8Array[];
latestBlockHash?: string;
private config: ClientConfig = getDefaultClientConfig();
private genesisCommittee: Uint8Array[] = this.config.genesis.committee.map(
(pk) => fromHexString(pk)
);
private genesisPeriod = computeSyncPeriodAtSlot(this.config.genesis.slot);
private genesisTime = this.config.genesis.time;
private prover: IProver;
private boot = false;
private beaconChainAPIURL: string;
private store: IStore;
private syncMutex = new Mutex();
private rpcUrl: string;
constructor(
prover: IProver,
store: IStore,
beaconUrl: string,
rpcUrl: string
) {
this.prover = prover;
this.store = store;
this.beaconChainAPIURL = beaconUrl;
this.rpcUrl = rpcUrl;
}
private _provider?: VerifyingProvider;
get provider(): VerifyingProvider {
return this._provider;
}
private _latestPeriod: number = -1;
get latestPeriod(): number {
return this._latestPeriod;
}
private _blockCache = new NodeCache({ stdTTL: 60 * 60 * 12 });
get blockCache(): NodeCache {
return this._blockCache;
}
private _blockHashCache = new NodeCache();
get blockHashCache(): NodeCache {
return this._blockHashCache;
}
public get isSynced() {
return this._latestPeriod === this.getCurrentPeriod();
}
public async sync(): Promise<void> {
await init("herumi");
await this._sync();
if (!this._provider) {
const { blockhash, blockNumber } = await this.getNextValidExecutionInfo();
const provider = new VerifyingProvider(
this.rpcUrl,
blockNumber,
blockhash
);
this._provider = provider;
}
const ei = await this.getLatestExecution();
if (ei && ei.blockhash !== this.latestBlockHash) {
this.latestBlockHash = ei.blockhash;
}
this._provider.update(ei.blockhash, ei.blockNumber);
}
async syncProver(
startPeriod: number,
currentPeriod: number,
startCommittee: Uint8Array[]
): Promise<{ syncCommittee: Uint8Array[]; period: number }> {
for (let period = startPeriod; period < currentPeriod; period += 1) {
try {
const update = await this.prover.getSyncUpdate(
period,
currentPeriod,
DEFAULT_BATCH_SIZE
);
const validOrCommittee = await this.syncUpdateVerifyGetCommittee(
startCommittee,
period,
update
);
if (!(validOrCommittee as boolean)) {
console.log(`Found invalid update at period(${period})`);
return {
syncCommittee: startCommittee,
period,
};
}
await this.store.addUpdate(period, update);
startCommittee = validOrCommittee as Uint8Array[];
} catch (e) {
console.error(`failed to fetch sync update for period(${period})`);
return {
syncCommittee: startCommittee,
period,
};
}
}
return {
syncCommittee: startCommittee,
period: currentPeriod,
};
}
// returns the prover info containing the current sync
public getCurrentPeriod(): number {
return computeSyncPeriodAtSlot(
getCurrentSlot(this.config.chainConfig, this.genesisTime)
);
}
optimisticUpdateFromJSON(update: any): OptimisticUpdate {
return capella.ssz.LightClientOptimisticUpdate.fromJson(update);
}
async optimisticUpdateVerify(
committee: Uint8Array[],
update: OptimisticUpdate
): Promise<VerifyWithReason> {
try {
const { attestedHeader: header, syncAggregate } = update;
const headerBlockRoot = phase0.ssz.BeaconBlockHeader.hashTreeRoot(
header.beacon
);
const committeeFast = this.deserializeSyncCommittee(committee);
try {
assertValidSignedHeader(
this.config.chainConfig,
committeeFast,
syncAggregate,
headerBlockRoot,
header.beacon.slot
);
} catch (e) {
return { correct: false, reason: "invalid signatures" };
}
const participation =
syncAggregate.syncCommitteeBits.getTrueBitIndexes().length;
if (participation < BEACON_SYNC_SUPER_MAJORITY) {
return { correct: false, reason: "insufficient signatures" };
}
if (!this.isValidLightClientHeader(this.config.chainConfig, header)) {
return { correct: false, reason: "invalid header" };
}
return { correct: true };
} catch (e) {
console.error(e);
return { correct: false, reason: (e as Error).message };
}
}
private isValidLightClientHeader(
config: ChainForkConfig,
header: allForks.LightClientHeader
): boolean {
return isValidMerkleBranch(
config
.getExecutionForkTypes(header.beacon.slot)
.ExecutionPayloadHeader.hashTreeRoot(
(header as capella.LightClientHeader).execution
),
(header as capella.LightClientHeader).executionBranch,
EXECUTION_PAYLOAD_DEPTH,
EXECUTION_PAYLOAD_INDEX,
header.beacon.bodyRoot
);
}
public async getNextValidExecutionInfo(
retry: number = 10
): Promise<ExecutionInfo> {
if (retry === 0)
throw new Error(
"no valid execution payload found in the given retry limit"
);
const ei = await this.getLatestExecution();
if (ei) return ei;
// delay for the next slot
await new Promise((resolve) => setTimeout(resolve, POLLING_DELAY));
return this.getNextValidExecutionInfo(retry - 1);
}
public async getExecutionFromBlockRoot(
slot: bigint,
expectedBlockRoot: Bytes32
): Promise<ExecutionInfo> {
const res = await handleGETRequest(
`${this.beaconChainAPIURL}/eth/v2/beacon/blocks/${slot}`
);
if (!res) {
throw Error(`fetching block failed`);
}
const blockJSON = res.data.message.body;
const block = bellatrix.ssz.BeaconBlockBody.fromJson(blockJSON);
const blockRoot = toHexString(
bellatrix.ssz.BeaconBlockBody.hashTreeRoot(block)
);
if (blockRoot !== expectedBlockRoot) {
throw Error(
`block provided by the beacon chain api doesn't match the expected block root`
);
}
this._blockCache.set(slot as any, res);
this._blockHashCache.set(slot as any, expectedBlockRoot);
return {
blockhash: blockJSON.execution_payload.block_hash,
blockNumber: blockJSON.execution_payload.block_number,
};
}
protected async _sync() {
await this.syncMutex.acquire();
const currentPeriod = this.getCurrentPeriod();
if (currentPeriod > this._latestPeriod) {
if (!this.boot) {
this.latestCommittee = await this.syncFromGenesis();
} else {
this.latestCommittee = await this.syncFromLastUpdate();
}
this._latestPeriod = currentPeriod;
}
this.syncMutex.release();
}
// committee and prover index of the first honest prover
protected async syncFromGenesis(): Promise<Uint8Array[]> {
// get the tree size by currentPeriod - genesisPeriod
const currentPeriod = this.getCurrentPeriod();
let startPeriod = this.genesisPeriod;
let startCommittee = this.genesisCommittee;
console.log(
`Sync started from period(${startPeriod}) to period(${currentPeriod})`
);
const { syncCommittee, period } = await this.syncProver(
startPeriod,
currentPeriod,
startCommittee
);
if (period === currentPeriod) {
return syncCommittee;
}
throw new Error("no honest prover found");
}
private async syncFromLastUpdate() {
// get the tree size by currentPeriod - genesisPeriod
const currentPeriod = this.getCurrentPeriod();
let startPeriod = this.latestPeriod;
let startCommittee = this.latestCommittee;
const { syncCommittee, period } = await this.syncProver(
startPeriod,
currentPeriod,
startCommittee
);
if (period === currentPeriod) {
return syncCommittee;
}
throw new Error("no honest prover found");
}
protected async syncUpdateVerifyGetCommittee(
prevCommittee: Uint8Array[],
period: number,
update: LightClientUpdate
): Promise<false | Uint8Array[]> {
const updatePeriod = computeSyncPeriodAtSlot(
update.attestedHeader.beacon.slot
);
if (period !== updatePeriod) {
console.error(
`Expected update with period ${period}, but recieved ${updatePeriod}`
);
return false;
}
const prevCommitteeFast = this.deserializeSyncCommittee(prevCommittee);
try {
// check if the update has valid signatures
await assertValidLightClientUpdate(
this.config.chainConfig,
prevCommitteeFast,
update
);
return update.nextSyncCommittee.pubkeys;
} catch (e) {
console.error(e);
return false;
}
}
protected async getLatestExecution(): Promise<ExecutionInfo | null> {
const updateJSON = await handleGETRequest(
`${this.beaconChainAPIURL}/eth/v1/beacon/light_client/optimistic_update`
);
if (!updateJSON) {
throw Error(`fetching optimistic update failed`);
}
const update = this.optimisticUpdateFromJSON(updateJSON.data);
const verify = await this.optimisticUpdateVerify(
this.latestCommittee,
update
);
if (!verify.correct) {
// @ts-ignore
console.error(`Invalid Optimistic Update: ${verify?.reason}`);
return null;
}
return this.getExecutionFromBlockRoot(
updateJSON.data.attested_header.beacon.slot,
updateJSON.data.attested_header.beacon.body_root
);
}
private deserializeSyncCommittee(
syncCommittee: Uint8Array[]
): SyncCommitteeFast {
const pubkeys = this.deserializePubkeys(syncCommittee);
return {
pubkeys,
aggregatePubkey: bls.PublicKey.aggregate(pubkeys),
};
}
private deserializePubkeys(pubkeys: Uint8Array[]): PublicKey[] {
return pubkeys.map((pk) => bls.PublicKey.fromBytes(pk));
}
}

532
src/client/constants.ts
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@ -1,532 +0,0 @@
export const BEACON_SYNC_COMMITTEE_SIZE = 512;
export const mainnetConfig = {
genesis_time: "1606824023",
genesis_validator_root:
"0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95",
slot: "6275237",
committee_pk: [
"0x9163821b21398fabd7fc110483c7100d4561f84d34eb8fe702762f5ad15b21c1de05b7552e400750ef87107054d2024c",
"0xb5b3eed089c61c731ea4b8da89d79953d1dcd076f0388e5a9a83d06601ccf8daf0b853ca706f79fee60ed2cd9a385f24",
"0xa84a73bbc11ea45136d6b315ae470c6494c418f9ec66648f3345f73f886e2b79171f1dc8bd7ca678064a71976ddd6866",
"0x86de1398c34f7ef2a0d6ad10f8d09591c7d1fa1dc5336513bba619933c0bd48be956367261aad5d17553aa6052434b34",
"0xb97cb89ec7055b04c7b9fd7eccc4a45715395c7316e42c9e241eadaaf7744b82b70b78acd6c64f95dd7138978356cd6c",
"0x8ee3b246427b9a208b272db2613fdde603b40550e0f3205a6f005d5e38cb028bdba44803287a78bc9c577324ae9e5251",
"0xa29f0427fc761318e6122277937b066950a6d749a5795f26e80b9fe1d2b41accb26c344b241d39e354638892b7f617f4",
"0x91246b7f68034b436ba623979c9a665746f3de5de495115c042a2332f23578131ed0c61aa69c24a1b1c3ea0732dec40b",
"0x8dbe5cf5acd2e860969a29165e04c5e7126070526dc160e2a77ebdccb1921be81bc1cc8d6d3bf704ff5efa9e47e4c355",
"0xa372476af4b0896ffb47efe4725537f9d4a49e563058008c74d1397f5d0a66c934b2c29078bd8e89f4b055d817453f03",
"0x8deaccd6915a70536cf44352e36139ce41dcac10bdf28616cb61b0b3f2dfb819267255709969497c986602d46f24e49e",
"0x877c5114d0fd6b1e3fe5853d297c31768c25f5aaf4a56d21c0d1167497009c9360e323810fefa294768555509f1da41f",
"0xa909c87e08c44584aae53f9380652edbf2373a0f7042e57d4340b4353d932495dadc8f340048180e578d9f93be77ca74",
"0x84e194104f1fab523bb2e5a91367612b15bdcd4d736e7f4633df695e0c1aabedea01b3440915cf0790661eb2a47af9f4",
"0xb1b58b4efd14539178aa289ca9a1a3b57efc8b12e3fb94ce6ee0014d7ad30c5c93f4e652cb5773f9f7d375f3e01dce3b",
"0x92b2a5471d662a302c6b2b90f3eae2c055ac3eeaf29c90f1a41f43eb4564f0eb15a641077f83bf4b59b61dec0bd651d5",
"0xb83ad1c495bc838742bebf2b5a31f4abf201ec93565146b95417a6794ad9c9cb0b944d7945d35735995b248d0d30f687",
"0xb64c8327897cb8b16a02a180242ea8eb3a7e8053db0ee4bbdc83bbf00b87b2300f386e43caf4dfac7627844a441d1727",
"0x836eba6f2f08438b95cc2f9e8f45ec42fc843892def3005df9291de9ff0bb8a26442270c6acbad1ea009b1026dfdd09b",
"0x90fcf0aecdf3bae07054961cd0b13922a61215e2bc128d481cbaa76eb98dae426b5fc848d4c357b46aff6eabf766ba6b",
"0x8208bfbf689752bed2c110b19f66d90e336be2f93331f0e32f355652a258366f79843a0f528f17c893e6a7feaadc5a11",
"0xa1e099011217619de38f780b46ab4bb97c88968ba994e3e0b47c9c32fabc985f1f74fb40deafa6670d5fcb41add29c4d",
"0x8184b64e342d9c02e47461b494782247bb178613d6ba814b7e96dab1170675fb45d0a2dddd3cf119361c022ffb58f55e",
"0x939fddb7877e6064ad39888f06ee733bbfb8523adc72d381e5429592ecbfb16fd26cc7b009fcfa03c56390f2e5da7cda",
"0x98421b84b58fbf62c1017c0b252848ae09d91c461693834e8b016a3dc476fa95aa4673fe858422a1ddacc0f7c85ef4c5",
"0xa3f69eb68d11d8fdf2f3718b114a8f6deda97474e9986e879acd503c0cb4cb2de319a015ce28c10f161f4fa485354857",
"0x8c14681476836e1b86f9d6c52c56b48269d1ef359f6006eac5063b7831cc73ab5d30eaba8a1fa99edbe9da03e9755969",
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],
};
export const BEACON_SYNC_SUPER_MAJORITY = Math.ceil(
(BEACON_SYNC_COMMITTEE_SIZE * 2) / 3
);
// These are the rough numbers from benchmark experiments
export const DEFAULT_BATCH_SIZE = 200;
export const DEFAULT_TREE_DEGREE = 200;
export const POLLING_DELAY = 13 * 1000; //13s (slightly higher than the slot time)

4
src/client/index.ts
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@ -1,4 +0,0 @@
import Client from "./client.js";
import Prover from "./prover.js";
export { Client, Prover };

13
src/client/interfaces.ts
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@ -1,13 +0,0 @@
import { AsyncOrSync } from "ts-essentials";
import { LightClientUpdate } from "./types.js";
export interface IProver {
getSyncUpdate(
period: number,
currentPeriod: number,
cacheCount: number
): AsyncOrSync<LightClientUpdate>;
}
export interface IStore {
addUpdate(period: number, update: LightClientUpdate): AsyncOrSync<void>;
}

52
src/client/memory-store.ts
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@ -1,52 +0,0 @@
import { digest } from "@chainsafe/as-sha256";
import { IStore } from "./interfaces.js";
import { LightClientUpdate } from "./types.js";
import { LightClientUpdateSSZ, CommitteeSSZ, HashesSSZ } from "./ssz.js";
import { concatUint8Array } from "./utils.js";
export class MemoryStore implements IStore {
store: {
[period: number]: {
update: Uint8Array;
nextCommittee: Uint8Array;
nextCommitteeHash: Uint8Array;
};
} = {};
addUpdate(period: number, update: LightClientUpdate) {
this.store[period] = {
update: LightClientUpdateSSZ.serialize(update),
nextCommittee: CommitteeSSZ.serialize(update.nextSyncCommittee.pubkeys),
nextCommitteeHash: digest(
concatUint8Array(update.nextSyncCommittee.pubkeys)
),
};
}
getUpdate(period: number): Uint8Array {
if (period in this.store) return this.store[period].update;
throw new Error(`update unavailable for period ${period}`);
}
getCommittee(period: number): Uint8Array {
if (period < 1)
throw new Error("committee not unavailable for period less than 1");
const predPeriod = period - 1;
if (predPeriod in this.store) return this.store[predPeriod].nextCommittee;
throw new Error(`committee unavailable for period ${predPeriod}`);
}
getCommitteeHashes(period: number, count: number): Uint8Array {
if (period < 1)
throw new Error("committee not unavailable for period less than 1");
const predPeriod = period - 1;
const hashes = new Array(count).fill(0).map((_, i) => {
const p = predPeriod + i;
if (p in this.store) return this.store[p].nextCommitteeHash;
throw new Error(`committee unavailable for period ${p}`);
});
return HashesSSZ.serialize(hashes);
}
}

39
src/client/prover.ts
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@ -1,39 +0,0 @@
import * as altair from "@lodestar/types/altair";
import { IProver } from "./interfaces.js";
import { LightClientUpdate } from "./types.js";
import { handleGETRequest } from "./utils.js";
export default class Prover implements IProver {
cachedSyncUpdate: Map<number, LightClientUpdate> = new Map();
private serverUrl: string;
constructor(serverUrl: string) {
this.serverUrl = serverUrl;
}
async _getSyncUpdates(
startPeriod: number,
maxCount: number
): Promise<LightClientUpdate[]> {
const res = await handleGETRequest(
`${this.serverUrl}/eth/v1/beacon/light_client/updates?start_period=${startPeriod}&count=${maxCount}`,
false
);
return res.map((u: any) => altair.ssz.LightClientUpdate.fromJson(u.data));
}
async getSyncUpdate(
period: number,
currentPeriod: number,
cacheCount: number
): Promise<LightClientUpdate> {
const _cacheCount = Math.min(currentPeriod - period + 1, cacheCount);
if (!this.cachedSyncUpdate.has(period)) {
const vals = await this._getSyncUpdates(period, _cacheCount);
for (let i = 0; i < _cacheCount; i++) {
this.cachedSyncUpdate.set(period + i, vals[i]);
}
}
return this.cachedSyncUpdate.get(period)!;
}
}

10
src/client/rpc/constants.ts
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@ -1,10 +0,0 @@
export const ZERO_ADDR = '0x0000000000000000000000000000000000000000';
// TODO: set the correct gas limit!
export const GAS_LIMIT = '0x1c9c380';
export const REQUEST_BATCH_SIZE = 10;
export const MAX_SOCKET = 10;
export const EMPTY_ACCOUNT_EXTCODEHASH =
'0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470';
export const MAX_BLOCK_HISTORY = BigInt(256);
export const MAX_BLOCK_FUTURE = BigInt(3);
export const DEFAULT_BLOCK_PARAMETER = 'latest';

13
src/client/rpc/errors.ts
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@ -1,13 +0,0 @@
import { JSONRPCErrorCode, JSONRPCErrorException } from 'json-rpc-2.0';
export class InternalError extends JSONRPCErrorException {
constructor(message: string) {
super(message, JSONRPCErrorCode.InternalError);
}
}
export class InvalidParamsError extends JSONRPCErrorException {
constructor(message: string) {
super(message, JSONRPCErrorCode.InvalidParams);
}
}

1
src/client/rpc/index.ts
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@ -1 +0,0 @@
export { VerifyingProvider } from "./provider.js";

708
src/client/rpc/provider.ts
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import _ from "lodash";
import { Trie } from "@ethereumjs/trie";
import rlp from "rlp";
import { Common, Chain } from "@ethereumjs/common";
import {
Address,
Account,
toType,
bufferToHex,
toBuffer,
TypeOutput,
setLengthLeft,
KECCAK256_NULL_S,
} from "@ethereumjs/util";
import { VM } from "@ethereumjs/vm";
import { BlockHeader, Block } from "@ethereumjs/block";
import { Blockchain } from "@ethereumjs/blockchain";
import { TransactionFactory } from "@ethereumjs/tx";
import {
AddressHex,
Bytes32,
RPCTx,
AccountResponse,
CodeResponse,
Bytes,
BlockNumber as BlockOpt,
HexString,
JSONRPCReceipt,
AccessList,
GetProof,
} from "./types.js";
import {
ZERO_ADDR,
MAX_BLOCK_HISTORY,
MAX_BLOCK_FUTURE,
DEFAULT_BLOCK_PARAMETER,
} from "./constants.js";
import { headerDataFromWeb3Response, blockDataFromWeb3Response } from "./utils";
import { keccak256 } from "ethers";
import { InternalError, InvalidParamsError } from "./errors.js";
import { RPC } from "./rpc.js";
const bigIntToHex = (n: string | bigint | number): string =>
"0x" + BigInt(n).toString(16);
const emptyAccountSerialize = new Account().serialize();
export class VerifyingProvider {
common: Common;
vm: VM | null = null;
private blockHashes: { [blockNumberHex: string]: Bytes32 } = {};
private blockPromises: {
[blockNumberHex: string]: { promise: Promise<void>; resolve: () => void };
} = {};
private blockHeaders: { [blockHash: string]: BlockHeader } = {};
private latestBlockNumber: bigint;
private _methods: Map<string, Function> = new Map<string, Function>(
Object.entries({
eth_getBalance: this.getBalance,
eth_blockNumber: this.blockNumber,
eth_chainId: this.chainId,
eth_getCode: this.getCode,
eth_getTransactionCount: this.getTransactionCount,
eth_call: this.call,
eth_estimateGas: this.estimateGas,
eth_sendRawTransaction: this.sendRawTransaction,
eth_getTransactionReceipt: this.getTransactionReceipt,
})
);
constructor(
providerURL: string,
blockNumber: bigint | number,
blockHash: Bytes32,
chain: bigint | Chain = Chain.Mainnet
) {
this._rpc = new RPC({ URL: providerURL });
this.common = new Common({
chain,
});
const _blockNumber = BigInt(blockNumber);
this.latestBlockNumber = _blockNumber;
this.blockHashes[bigIntToHex(_blockNumber)] = blockHash;
}
private _rpc: RPC;
get rpc(): RPC {
return this._rpc;
}
async update(blockHash: Bytes32, blockNumber: bigint) {
const blockNumberHex = bigIntToHex(blockNumber);
if (
blockNumberHex in this.blockHashes &&
this.blockHashes[blockNumberHex] !== blockHash
) {
console.log(
"Overriding an existing verified blockhash. Possibly the chain had a reorg"
);
}
const latestBlockNumber = this.latestBlockNumber;
this.latestBlockNumber = blockNumber;
this.blockHashes[blockNumberHex] = blockHash;
if (blockNumber > latestBlockNumber) {
for (let b = latestBlockNumber + BigInt(1); b <= blockNumber; b++) {
const bHex = bigIntToHex(b);
if (bHex in this.blockPromises) {
this.blockPromises[bHex].resolve();
}
}
}
await this.getBlockHeader("latest");
}
public async rpcMethod(method: string, params: any) {
if (this._methods.has(method)) {
return this._methods.get(method)?.bind(this)(...params);
}
throw new Error("method not found");
}
public rpcMethodSupported(method: string): boolean {
return this._methods.has(method);
}
private async getBalance(
addressHex: AddressHex,
blockOpt: BlockOpt = DEFAULT_BLOCK_PARAMETER
) {
const header = await this.getBlockHeader(blockOpt);
const address = Address.fromString(addressHex);
const { result: proof, success } = await this._rpc.request({
method: "eth_getProof",
params: [addressHex, [], bigIntToHex(header.number)],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
const isAccountCorrect = await this.verifyProof(
address,
[],
header.stateRoot,
proof
);
if (!isAccountCorrect) {
throw new InternalError("Invalid account proof provided by the RPC");
}
return bigIntToHex(proof.balance);
}
private async blockNumber(): Promise<HexString> {
return bigIntToHex(this.latestBlockNumber);
}
private async chainId(): Promise<HexString> {
return bigIntToHex(this.common.chainId());
}
private async getCode(
addressHex: AddressHex,
blockOpt: BlockOpt = DEFAULT_BLOCK_PARAMETER
): Promise<HexString> {
const header = await this.getBlockHeader(blockOpt);
const res = await this._rpc.requestBatch([
{
method: "eth_getProof",
params: [addressHex, [], bigIntToHex(header.number)],
},
{
method: "eth_getCode",
params: [addressHex, bigIntToHex(header.number)],
},
]);
if (res.some((r) => !r.success)) {
throw new InternalError(`RPC request failed`);
}
const [accountProof, code] = [res[0].result, res[1].result];
const address = Address.fromString(addressHex);
const isAccountCorrect = await this.verifyProof(
address,
[],
header.stateRoot,
accountProof
);
if (!isAccountCorrect) {
throw new InternalError(`invalid account proof provided by the RPC`);
}
const isCodeCorrect = await this.verifyCodeHash(
code,
accountProof.codeHash
);
if (!isCodeCorrect) {
throw new InternalError(
`code provided by the RPC doesn't match the account's codeHash`
);
}
return code;
}
private async getTransactionCount(
addressHex: AddressHex,
blockOpt: BlockOpt = DEFAULT_BLOCK_PARAMETER
): Promise<HexString> {
const header = await this.getBlockHeader(blockOpt);
const address = Address.fromString(addressHex);
const { result: proof, success } = await this._rpc.request({
method: "eth_getProof",
params: [addressHex, [], bigIntToHex(header.number)],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
const isAccountCorrect = await this.verifyProof(
address,
[],
header.stateRoot,
proof
);
if (!isAccountCorrect) {
throw new InternalError(`invalid account proof provided by the RPC`);
}
return bigIntToHex(proof.nonce.toString());
}
private async call(
transaction: RPCTx,
blockOpt: BlockOpt = DEFAULT_BLOCK_PARAMETER
) {
try {
this.validateTx(transaction);
} catch (e: any) {
throw new InvalidParamsError((e as Error).message);
}
const header = await this.getBlockHeader(blockOpt);
const vm = await this.getVM(transaction, header);
const {
from,
to,
gas: gasLimit,
gasPrice,
maxPriorityFeePerGas,
value,
data,
} = transaction;
try {
const runCallOpts = {
caller: from ? Address.fromString(from) : undefined,
to: to ? Address.fromString(to) : undefined,
gasLimit: toType(gasLimit, TypeOutput.BigInt),
gasPrice: toType(gasPrice || maxPriorityFeePerGas, TypeOutput.BigInt),
value: toType(value, TypeOutput.BigInt),
data: data ? toBuffer(data) : undefined,
block: { header },
};
const { execResult } = await vm.evm.runCall(runCallOpts);
return bufferToHex(execResult.returnValue);
} catch (error: any) {
throw new InternalError(error.message.toString());
}
}
private async estimateGas(
transaction: RPCTx,
blockOpt: BlockOpt = DEFAULT_BLOCK_PARAMETER
) {
try {
this.validateTx(transaction);
} catch (e) {
throw new InvalidParamsError((e as Error).message);
}
const header = await this.getBlockHeader(blockOpt);
if (transaction.gas == undefined) {
// If no gas limit is specified use the last block gas limit as an upper bound.
transaction.gas = bigIntToHex(header.gasLimit);
}
const txType = BigInt(
transaction.maxFeePerGas || transaction.maxPriorityFeePerGas
? 2
: transaction.accessList
? 1
: 0
);
if (txType == BigInt(2)) {
transaction.maxFeePerGas =
transaction.maxFeePerGas || bigIntToHex(header.baseFeePerGas!);
} else {
if (
transaction.gasPrice == undefined ||
BigInt(transaction.gasPrice) === BigInt(0)
) {
transaction.gasPrice = bigIntToHex(header.baseFeePerGas!);
}
}
const txData = {
...transaction,
type: bigIntToHex(txType),
gasLimit: transaction.gas,
};
const tx = TransactionFactory.fromTxData(txData, {
common: this.common,
freeze: false,
});
const vm = await this.getVM(transaction, header);
// set from address
const from = transaction.from
? Address.fromString(transaction.from)
: Address.zero();
tx.getSenderAddress = () => {
return from;
};
try {
const { totalGasSpent } = await vm.runTx({
tx,
skipNonce: true,
skipBalance: true,
skipBlockGasLimitValidation: true,
block: { header } as any,
});
return bigIntToHex(totalGasSpent);
} catch (error: any) {
throw new InternalError(error.message.toString());
}
}
private async sendRawTransaction(signedTx: string): Promise<string> {
// TODO: brodcast tx directly to the mem pool?
const { success } = await this._rpc.request({
method: "eth_sendRawTransaction",
params: [signedTx],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
const tx = TransactionFactory.fromSerializedData(toBuffer(signedTx), {
common: this.common,
});
return bufferToHex(tx.hash());
}
private async getTransactionReceipt(
txHash: Bytes32
): Promise<JSONRPCReceipt | null> {
const { result: receipt, success } = await this._rpc.request({
method: "eth_getTransactionReceipt",
params: [txHash],
});
if (!(success && receipt)) {
return null;
}
const header = await this.getBlockHeader(receipt.blockNumber);
const block = await this.getBlock(header);
const index = block.transactions.findIndex(
(tx) => bufferToHex(tx.hash()) === txHash.toLowerCase()
);
if (index === -1) {
throw new InternalError("the recipt provided by the RPC is invalid");
}
const tx = block.transactions[index];
return {
transactionHash: txHash,
transactionIndex: bigIntToHex(index),
blockHash: bufferToHex(block.hash()),
blockNumber: bigIntToHex(block.header.number),
from: tx.getSenderAddress().toString(),
to: tx.to?.toString() ?? null,
cumulativeGasUsed: "0x0",
effectiveGasPrice: "0x0",
gasUsed: "0x0",
contractAddress: null,
logs: [],
logsBloom: "0x0",
status: BigInt(receipt.status) ? "0x1" : "0x0", // unverified!!
};
}
private async getVMCopy(): Promise<VM> {
if (this.vm === null) {
const blockchain = await Blockchain.create({ common: this.common });
// path the blockchain to return the correct blockhash
(blockchain as any).getBlock = async (blockId: number) => {
const _hash = toBuffer(await this.getBlockHash(BigInt(blockId)));
return {
hash: () => _hash,
};
};
this.vm = await VM.create({ common: this.common, blockchain });
}
return await this.vm!.copy();
}
private async getVM(tx: RPCTx, header: BlockHeader): Promise<VM> {
// forcefully set gasPrice to 0 to avoid not enough balance error
const _tx = {
to: tx.to,
from: tx.from ? tx.from : ZERO_ADDR,
data: tx.data,
value: tx.value,
gasPrice: "0x0",
gas: tx.gas ? tx.gas : bigIntToHex(header.gasLimit!),
};
const { result, success } = await this._rpc.request({
method: "eth_createAccessList",
params: [_tx, bigIntToHex(header.number)],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
const accessList = result.accessList as AccessList;
accessList.push({ address: _tx.from, storageKeys: [] });
if (_tx.to && !accessList.some((a) => a.address.toLowerCase() === _tx.to)) {
accessList.push({ address: _tx.to, storageKeys: [] });
}
const vm = await this.getVMCopy();
await vm.stateManager.checkpoint();
const requests = accessList
.map((access) => {
return [
{
method: "eth_getProof",
params: [
access.address,
access.storageKeys,
bigIntToHex(header.number),
],
},
{
method: "eth_getCode",
params: [access.address, bigIntToHex(header.number)],
},
];
})
.flat();
const rawResponse = await this._rpc.requestBatch(requests);
if (rawResponse.some((r: any) => !r.success)) {
throw new InternalError(`RPC request failed`);
}
const responses = _.chunk(
rawResponse.map((r: any) => r.result),
2
) as [AccountResponse, CodeResponse][];
for (let i = 0; i < accessList.length; i++) {
const { address: addressHex, storageKeys } = accessList[i];
const [accountProof, code] = responses[i];
const {
nonce,
balance,
codeHash,
storageProof: storageAccesses,
} = accountProof;
const address = Address.fromString(addressHex);
const isAccountCorrect = await this.verifyProof(
address,
storageKeys,
header.stateRoot,
accountProof
);
if (!isAccountCorrect) {
throw new InternalError(`invalid account proof provided by the RPC`);
}
const isCodeCorrect = await this.verifyCodeHash(code, codeHash);
if (!isCodeCorrect) {
throw new InternalError(
`code provided by the RPC doesn't match the account's codeHash`
);
}
const account = Account.fromAccountData({
nonce: BigInt(nonce),
balance: BigInt(balance),
codeHash,
});
await vm.stateManager.putAccount(address, account);
for (let storageAccess of storageAccesses) {
await vm.stateManager.putContractStorage(
address,
setLengthLeft(toBuffer(storageAccess.key), 32),
setLengthLeft(toBuffer(storageAccess.value), 32)
);
}
if (code !== "0x")
await vm.stateManager.putContractCode(address, toBuffer(code));
}
await vm.stateManager.commit();
return vm;
}
private async getBlockHeader(blockOpt: BlockOpt): Promise<BlockHeader> {
const blockNumber = this.getBlockNumberByBlockOpt(blockOpt);
await this.waitForBlockNumber(blockNumber);
const blockHash = await this.getBlockHash(blockNumber);
return this.getBlockHeaderByHash(blockHash);
}
private getBlockNumberByBlockOpt(blockOpt: BlockOpt): bigint {
// TODO: add support for blockOpts below
if (
typeof blockOpt === "string" &&
["pending", "earliest", "finalized", "safe"].includes(blockOpt)
) {
throw new InvalidParamsError(`"pending" is not yet supported`);
} else if (blockOpt === "latest") {
return this.latestBlockNumber;
} else {
const blockNumber = BigInt(blockOpt as any);
if (blockNumber > this.latestBlockNumber + MAX_BLOCK_FUTURE) {
throw new InvalidParamsError("specified block is too far in future");
} else if (blockNumber + MAX_BLOCK_HISTORY < this.latestBlockNumber) {
throw new InvalidParamsError(
`specified block cannot older that ${MAX_BLOCK_HISTORY}`
);
}
return blockNumber;
}
}
private async waitForBlockNumber(blockNumber: bigint) {
if (blockNumber <= this.latestBlockNumber) return;
console.log(`waiting for blockNumber ${blockNumber}`);
const blockNumberHex = bigIntToHex(blockNumber);
if (!(blockNumberHex in this.blockPromises)) {
let r: () => void = () => {};
const p = new Promise<void>((resolve) => {
r = resolve;
});
this.blockPromises[blockNumberHex] = {
promise: p,
resolve: r,
};
}
return this.blockPromises[blockNumberHex].promise;
}
private async getBlockHeaderByHash(blockHash: Bytes32) {
if (!this.blockHeaders[blockHash]) {
const { result: blockInfo, success } = await this._rpc.request({
method: "eth_getBlockByHash",
params: [blockHash, true],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
const headerData = headerDataFromWeb3Response(blockInfo);
const header = BlockHeader.fromHeaderData(headerData);
if (!header.hash().equals(toBuffer(blockHash))) {
throw new InternalError(
`blockhash doesn't match the blockInfo provided by the RPC`
);
}
this.blockHeaders[blockHash] = header;
}
return this.blockHeaders[blockHash];
}
private async verifyProof(
address: Address,
storageKeys: Bytes32[],
stateRoot: Buffer,
proof: GetProof
): Promise<boolean> {
const trie = new Trie();
const key = keccak256(address.toString());
const expectedAccountRLP = await trie.verifyProof(
stateRoot,
toBuffer(key),
proof.accountProof.map((a) => toBuffer(a))
);
const account = Account.fromAccountData({
nonce: BigInt(proof.nonce),
balance: BigInt(proof.balance),
storageRoot: proof.storageHash,
codeHash: proof.codeHash,
});
const isAccountValid = account
.serialize()
.equals(expectedAccountRLP ? expectedAccountRLP : emptyAccountSerialize);
if (!isAccountValid) return false;
for (let i = 0; i < storageKeys.length; i++) {
const sp = proof.storageProof[i];
const key = keccak256(
bufferToHex(setLengthLeft(toBuffer(storageKeys[i]), 32))
);
const expectedStorageRLP = await trie.verifyProof(
toBuffer(proof.storageHash),
toBuffer(key),
sp.proof.map((a) => toBuffer(a))
);
const isStorageValid =
(!expectedStorageRLP && sp.value === "0x0") ||
(!!expectedStorageRLP &&
expectedStorageRLP.equals(Buffer.from(rlp.encode(sp.value))));
if (!isStorageValid) return false;
}
return true;
}
private verifyCodeHash(code: Bytes, codeHash: Bytes32): boolean {
return (
(code === "0x" && codeHash === "0x" + KECCAK256_NULL_S) ||
keccak256(code) === codeHash
);
}
private validateTx(tx: RPCTx) {
if (tx.gasPrice !== undefined && tx.maxFeePerGas !== undefined) {
throw new Error("Cannot send both gasPrice and maxFeePerGas params");
}
if (tx.gasPrice !== undefined && tx.maxPriorityFeePerGas !== undefined) {
throw new Error("Cannot send both gasPrice and maxPriorityFeePerGas");
}
if (
tx.maxFeePerGas !== undefined &&
tx.maxPriorityFeePerGas !== undefined &&
BigInt(tx.maxPriorityFeePerGas) > BigInt(tx.maxFeePerGas)
) {
throw new Error(
`maxPriorityFeePerGas (${tx.maxPriorityFeePerGas.toString()}) is bigger than maxFeePerGas (${tx.maxFeePerGas.toString()})`
);
}
}
private async getBlock(header: BlockHeader) {
const { result: blockInfo, success } = await this._rpc.request({
method: "eth_getBlockByNumber",
params: [bigIntToHex(header.number), true],
});
if (!success) {
throw new InternalError(`RPC request failed`);
}
// TODO: add support for uncle headers; First fetch all the uncles
// add it to the blockData, verify the uncles and use it
const blockData = blockDataFromWeb3Response(blockInfo);
const block = Block.fromBlockData(blockData, { common: this.common });
if (!block.header.hash().equals(header.hash())) {
throw new InternalError(
`BN(${header.number}): blockhash doest match the blockData provided by the RPC`
);
}
if (!(await block.validateTransactionsTrie())) {
throw new InternalError(
`transactionTree doesn't match the transactions provided by the RPC`
);
}
return block;
}
private async getBlockHash(blockNumber: bigint) {
if (blockNumber > this.latestBlockNumber)
throw new Error("cannot return blockhash for a blocknumber in future");
// TODO: fetch the blockHeader is batched request
let lastVerifiedBlockNumber = this.latestBlockNumber;
while (lastVerifiedBlockNumber > blockNumber) {
const hash = this.blockHashes[bigIntToHex(lastVerifiedBlockNumber)];
const header = await this.getBlockHeaderByHash(hash);
lastVerifiedBlockNumber--;
const parentBlockHash = bufferToHex(header.parentHash);
const parentBlockNumberHex = bigIntToHex(lastVerifiedBlockNumber);
if (
parentBlockNumberHex in this.blockHashes &&
this.blockHashes[parentBlockNumberHex] !== parentBlockHash
) {
console.log(
"Overriding an existing verified blockhash. Possibly the chain had a reorg"
);
}
this.blockHashes[parentBlockNumberHex] = parentBlockHash;
}
return this.blockHashes[bigIntToHex(blockNumber)];
}
}

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src/client/rpc/rpc.ts
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import NodeCache from "node-cache";
import { PluginAPI } from "@lumeweb/interface-relay";
import stringify from "json-stringify-deterministic";
export type RPCRequest = {
method: string;
params: any[];
};
export type RPCRequestRaw = RPCRequest & {
jsonrpc: string;
id: string;
};
export type RPCResponse = {
success: boolean;
result: any;
};
export type ProviderConfig = {
URL: string;
unsupportedMethods?: string[];
supportBatchRequests?: boolean;
batchSize?: number;
};
export class RPC {
get cache(): NodeCache {
return this._cache;
}
private provider: ProviderConfig;
private _cache = new NodeCache({ stdTTL: 60 * 60 * 12 });
constructor(provider: ProviderConfig) {
this.provider = provider;
}
private _pluginApi?: PluginAPI;
set pluginApi(value: PluginAPI) {
this._pluginApi = value;
}
async request(request: RPCRequest) {
if (this.provider.unsupportedMethods?.includes(request.method)) {
throw new Error("method not supported by the provider");
}
return await this._retryRequest(request);
}
async requestBatch(requests: RPCRequest[]) {
if (
this.provider?.unsupportedMethods &&
requests.some((r) => this.provider.unsupportedMethods!.includes(r.method))
) {
throw new Error("method not supported by the provider");
}
const res = [];
for (const request of requests) {
const r = await this._retryRequest(request);
res.push(r);
}
return res;
}
protected async _request(request: RPCRequestRaw): Promise<RPCResponse> {
try {
const response = await (
await fetch(this.provider.URL, {
method: "POST",
body: JSON.stringify(request),
})
).json();
if (response.result) {
const tempRequest = {
method: request.method,
params: request.params,
};
const hash = this._pluginApi.util.crypto
.createHash(stringify(tempRequest))
.toString("hex");
// this._cache.set(hash, response);
}
return {
success: !response.error,
result: response.error || response.result,
};
} catch (e) {
return {
success: false,
result: { message: `request failed: ${e}` },
};
}
}
private async _retryRequest(
_request: RPCRequest,
retry = 5
): Promise<RPCResponse> {
const request = {
..._request,
jsonrpc: "2.0",
id: this.generateId(),
};
for (let i = retry; i > 0; i--) {
const res = await this._request(request);
if (res.success) {
return res;
} else if (i == 1) {
console.error(
`RPC batch request failed after maximum retries: ${JSON.stringify(
request,
null,
2
)} ${JSON.stringify(res, null, 2)}`
);
}
}
throw new Error("RPC request failed");
}
private generateId(): string {
return Math.floor(Math.random() * 2 ** 64).toFixed();
}
public getCachedRequest(request: RPCRequest): RPCResponse | null {
const hash = this.hashRequest(request);
if (this.cache.has(hash)) {
this.cache.ttl(hash);
return this.cache.get(hash);
}
return null;
}
public deleteCachedRequest(request: RPCRequest): void {
const hash = this.hashRequest(request);
this.cache.del(hash);
}
private hashRequest(request: RPCRequest): string {
const tempRequest = {
method: request.method,
params: request.params,
};
return this._pluginApi.util.crypto
.createHash(stringify(tempRequest))
.toString("hex");
}
}

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src/client/rpc/types.ts
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import type { GetProof } from "web3-eth";
import type { BlockNumber } from "web3-core";
import type { Method } from "web3-core-method";
import type { JsonTx } from "@ethereumjs/tx";
export type { GetProof, BlockNumber, Method };
export type Bytes = string;
export type Bytes32 = string;
export type AddressHex = string;
export type ChainId = number;
export type HexString = string;
// Some of the types below are taken from:
// https://github.com/ethereumjs/ethereumjs-monorepo/blob/master/packages/client/lib/rpc/modules/eth.ts
export type AccessList = { address: AddressHex; storageKeys: Bytes32[] }[];
export interface RPCTx {
from?: string;
to?: string;
gas?: string;
gasPrice?: string;
maxFeePerGas?: string;
maxPriorityFeePerGas?: string;
accessList?: AccessList;
value?: string;
data?: string;
}
export type AccountResponse = GetProof;
export type CodeResponse = string;
export type JSONRPCReceipt = {
transactionHash: string; // DATA, 32 Bytes - hash of the transaction.
transactionIndex: string; // QUANTITY - integer of the transactions index position in the block.
blockHash: string; // DATA, 32 Bytes - hash of the block where this transaction was in.
blockNumber: string; // QUANTITY - block number where this transaction was in.
from: string; // DATA, 20 Bytes - address of the sender.
to: string | null; // DATA, 20 Bytes - address of the receiver. null when it's a contract creation transaction.
cumulativeGasUsed: string; // QUANTITY - The total amount of gas used when this transaction was executed in the block.
effectiveGasPrice: string; // QUANTITY - The final gas price per gas paid by the sender in wei.
gasUsed: string; // QUANTITY - The amount of gas used by this specific transaction alone.
contractAddress: string | null; // DATA, 20 Bytes - The contract address created, if the transaction was a contract creation, otherwise null.
logs: JSONRPCLog[]; // Array - Array of log objects, which this transaction generated.
logsBloom: string; // DATA, 256 Bytes - Bloom filter for light clients to quickly retrieve related logs.
// It also returns either:
root?: string; // DATA, 32 bytes of post-transaction stateroot (pre Byzantium)
status?: string; // QUANTITY, either 1 (success) or 0 (failure)
};
export type JSONRPCLog = {
removed: boolean; // TAG - true when the log was removed, due to a chain reorganization. false if it's a valid log.
logIndex: string | null; // QUANTITY - integer of the log index position in the block. null when it's pending.
transactionIndex: string | null; // QUANTITY - integer of the transactions index position log was created from. null when it's pending.
transactionHash: string | null; // DATA, 32 Bytes - hash of the transactions this log was created from. null when it's pending.
blockHash: string | null; // DATA, 32 Bytes - hash of the block where this log was in. null when it's pending.
blockNumber: string | null; // QUANTITY - the block number where this log was in. null when it's pending.
address: string; // DATA, 20 Bytes - address from which this log originated.
data: string; // DATA - contains one or more 32 Bytes non-indexed arguments of the log.
topics: string[]; // Array of DATA - Array of 0 to 4 32 Bytes DATA of indexed log arguments.
// (In solidity: The first topic is the hash of the signature of the event
// (e.g. Deposit(address,bytes32,uint256)), except you declared the event with the anonymous specifier.)
};

68
src/client/rpc/utils.ts
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@ -1,68 +0,0 @@
import {
setLengthLeft,
toBuffer,
bigIntToHex,
bufferToHex,
intToHex,
} from "@ethereumjs/util";
import { HeaderData, BlockData, Block } from "@ethereumjs/block";
import {
TxData,
AccessListEIP2930TxData,
FeeMarketEIP1559TxData,
TypedTransaction,
} from "@ethereumjs/tx";
const isTruthy = (val: any) => !!val;
// TODO: fix blockInfo type
export function headerDataFromWeb3Response(blockInfo: any): HeaderData {
return {
parentHash: blockInfo.parentHash,
uncleHash: blockInfo.sha3Uncles,
coinbase: blockInfo.miner,
stateRoot: blockInfo.stateRoot,
transactionsTrie: blockInfo.transactionsRoot,
receiptTrie: blockInfo.receiptsRoot,
logsBloom: blockInfo.logsBloom,
difficulty: BigInt(blockInfo.difficulty),
number: BigInt(blockInfo.number),
gasLimit: BigInt(blockInfo.gasLimit),
gasUsed: BigInt(blockInfo.gasUsed),
timestamp: BigInt(blockInfo.timestamp),
extraData: blockInfo.extraData,
mixHash: (blockInfo as any).mixHash, // some reason the types are not up to date :(
nonce: blockInfo.nonce,
baseFeePerGas: blockInfo.baseFeePerGas
? BigInt(blockInfo.baseFeePerGas)
: undefined,
};
}
export function txDataFromWeb3Response(
txInfo: any
): TxData | AccessListEIP2930TxData | FeeMarketEIP1559TxData {
return {
...txInfo,
data: txInfo.input,
gasPrice: BigInt(txInfo.gasPrice),
gasLimit: txInfo.gas,
to: isTruthy(txInfo.to)
? setLengthLeft(toBuffer(txInfo.to), 20)
: undefined,
value: BigInt(txInfo.value),
maxFeePerGas: isTruthy(txInfo.maxFeePerGas)
? BigInt(txInfo.maxFeePerGas)
: undefined,
maxPriorityFeePerGas: isTruthy(txInfo.maxPriorityFeePerGas)
? BigInt(txInfo.maxPriorityFeePerGas)
: undefined,
};
}
export function blockDataFromWeb3Response(blockInfo: any): BlockData {
return {
header: headerDataFromWeb3Response(blockInfo),
transactions: blockInfo.transactions.map(txDataFromWeb3Response),
};
}

139
src/client/rpc/validation.ts
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@ -1,139 +0,0 @@
import { InvalidParamsError } from './errors';
// Most of the validations are taken from:
// https://github.com/ethereumjs/ethereumjs-monorepo/blob/master/packages/client/lib/rpc/validation.ts
/**
* @memberof module:rpc
*/
export const validators = {
/**
* address validator to ensure has `0x` prefix and 20 bytes length
* @param params parameters of method
* @param index index of parameter
*/
address(params: any[], index: number) {
this.hex(params, index);
const address = params[index].substr(2);
if (!/^[0-9a-fA-F]+$/.test(address) || address.length !== 40) {
throw new InvalidParamsError(
`invalid argument ${index}: invalid address`,
);
}
},
/**
* hex validator to ensure has `0x` prefix
* @param params parameters of method
* @param index index of parameter
*/
hex(params: any[], index: number) {
if (typeof params[index] !== 'string') {
throw new InvalidParamsError(
`invalid argument ${index}: argument must be a hex string`,
);
}
if (params[index].substr(0, 2) !== '0x') {
throw new InvalidParamsError(
`invalid argument ${index}: hex string without 0x prefix`,
);
}
},
/**
* hex validator to validate block hash
* @param params parameters of method
* @param index index of parameter
*/
blockHash(params: any[], index: number) {
this.hex(params, index);
const blockHash = params[index].substring(2);
if (!/^[0-9a-fA-F]+$/.test(blockHash) || blockHash.length !== 64) {
throw new InvalidParamsError(
`invalid argument ${index}: invalid block hash`,
);
}
},
/**
* validator to ensure valid block integer or hash, or string option ["latest", "earliest", "pending"]
* @param params parameters of method
* @param index index of parameter
*/
blockOption(params: any[], index: number) {
const blockOption = params[index];
if (typeof blockOption !== 'string') {
throw new InvalidParamsError(
`invalid argument ${index}: argument must be a string`,
);
}
try {
if (['latest', 'earliest', 'pending'].includes(blockOption)) {
return;
}
return this.hex([blockOption], 0);
} catch (e) {
throw new InvalidParamsError(
`invalid argument ${index}: block option must be a valid hex block number, or "latest", "earliest" or "pending"`,
);
}
},
/**
* bool validator to check if type is boolean
* @param params parameters of method
* @param index index of parameter
*/
bool(params: any[], index: number) {
if (typeof params[index] !== 'boolean') {
throw new InvalidParamsError(
`invalid argument ${index}: argument is not boolean`,
);
}
},
/**
* params length validator
* @param params parameters of method
* @requiredParamsLength required length of parameters
*/
paramsLength(
params: any[],
requiredParamsCount: number,
maxParamsCount: number = requiredParamsCount,
) {
if (params.length < requiredParamsCount || params.length > maxParamsCount) {
throw new InvalidParamsError(
`missing value for required argument ${params.length}`,
);
}
},
transaction(params: any[], index: number) {
const tx = params[index];
if (typeof tx !== 'object') {
throw new InvalidParamsError(
`invalid argument ${index}: argument must be an object`,
);
}
// validate addresses
for (const field of [tx.to, tx.from]) {
// TODO: the below will create an error with incorrect index if the tx is not at index 0
if (field !== undefined) this.address([field], 0);
}
// validate hex
for (const field of [tx.gas, tx.gasPrice, tx.value, tx.data]) {
// TODO: the below will create an error with incorrect index if the tx is not at index 0
if (field !== undefined) this.hex([field], 0);
}
},
};

23
src/client/ssz.ts
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@ -1,23 +0,0 @@
import {
ByteVectorType,
ListCompositeType,
VectorCompositeType,
} from "@chainsafe/ssz";
import * as capella from "@lodestar/types/capella";
import { BEACON_SYNC_COMMITTEE_SIZE } from "./constants.js";
const MAX_BATCHSIZE = 10000;
export const LightClientUpdateSSZ = capella.ssz.LightClientUpdate;
export const LightClientUpdatesSSZ = new ListCompositeType(
LightClientUpdateSSZ as any,
MAX_BATCHSIZE
);
export const CommitteeSSZ = new VectorCompositeType(
new ByteVectorType(48),
BEACON_SYNC_COMMITTEE_SIZE
);
const HashSSZ = new ByteVectorType(32);
export const HashesSSZ = new ListCompositeType(HashSSZ, MAX_BATCHSIZE);

31
src/client/types.ts
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import { BeaconConfig } from "@lodestar/config";
import * as capella from "@lodestar/types/capella";
export type PubKeyString = string;
export type Slot = number;
export type Bytes32 = string;
export type OptimisticUpdate = capella.LightClientOptimisticUpdate;
export type LightClientUpdate = capella.LightClientUpdate;
export type GenesisData = {
committee: PubKeyString[];
slot: Slot;
time: number;
};
export type ClientConfig = {
genesis: GenesisData;
chainConfig: BeaconConfig;
// treeDegree in case of Superlight and batchSize in case of Light and Optimistic
n?: number;
};
export type ExecutionInfo = {
blockhash: string;
blockNumber: bigint;
};
export type VerifyWithReason =
| { correct: true }
| { correct: false; reason: string };

49
src/client/utils.ts
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@ -1,49 +0,0 @@
import { fromHexString, toHexString } from "@chainsafe/ssz";
import bls from "@chainsafe/bls/switchable";
import { createBeaconConfig } from "@lodestar/config";
import { mainnetConfig } from "./constants.js";
import { networksChainConfig } from "@lodestar/config/networks";
import fetch from "node-fetch";
export function concatUint8Array(data: Uint8Array[]) {
const l = data.reduce((l, d) => l + d.length, 0);
let result = new Uint8Array(l);
let offset = 0;
data.forEach((d) => {
result.set(d, offset);
offset += d.length;
});
return result;
}
export function getDefaultClientConfig() {
const chainConfig = createBeaconConfig(
networksChainConfig.mainnet,
fromHexString(mainnetConfig.genesis_validator_root)
);
return {
genesis: {
committee: mainnetConfig.committee_pk,
slot: parseInt(mainnetConfig.slot),
time: parseInt(mainnetConfig.genesis_time),
},
chainConfig,
n: 1,
};
}
export async function handleGETRequest(
url: string,
retry: number = 3
): Promise<any> {
if (retry < 0) {
throw Error(`GET request failed: ${url}`);
}
try {
const ret = await fetch(url);
return await ret.json();
} catch (e) {
console.error(`failed GET request (${url}): ${e.message}`);
return handleGETRequest(url, retry - 1);
}
}

221
src/index.ts
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@ -1,218 +1,81 @@
import type { Plugin, PluginAPI } from "@lumeweb/interface-relay"; import type { Plugin, PluginAPI } from "@lumeweb/interface-relay";
import fetch, { Request, RequestInit } from "node-fetch"; import {
import NodeCache from "node-cache"; ConsensusCommitteeUpdateRequest,
import { Client, Prover } from "./client/index.js"; createDefaultClient,
import { MemoryStore } from "./client/memory-store.js"; } from "@lumeweb/libethsync/node";
import { computeSyncPeriodAtSlot } from "@lodestar/light-client/utils"; import { RPCRequestRaw } from "@lumeweb/libethsync/client";
import { toHexString } from "@chainsafe/ssz"; import axios from "axios";
import { DEFAULT_BATCH_SIZE } from "./client/constants.js";
import { handleGETRequest } from "./client/utils.js";
const EXECUTION_RPC_URL = const EXECUTION_RPC_URL = "https://rpc.ankr.com/eth";
"https://solemn-small-frost.discover.quiknode.pro/dbbe3dc75a8b828611df3f12722de5cc88214947/";
const CONSENSUS_RPC_URL = "https://www.lightclientdata.org"; const CONSENSUS_RPC_URL = "http://nimbus-mainnet.commonprefix.com";
interface ExecutionRequest { interface ExecutionRequest {
method: string; method: string;
params: any[]; params: any[];
} }
interface ConsensusCommitteeHashesRequest { const executionClient = axios.create({ baseURL: EXECUTION_RPC_URL });
start: number;
count: number;
}
interface ConsensusCommitteePeriodRequest {
period: number | "latest";
}
interface ConsensusBlockRequest {
block: number;
}
let client: Client;
const RPC_NO_CACHE = [
"eth_call",
"eth_estimateGas",
"eth_sendRawTransaction",
"eth_getTransactionReceipt",
"eth_getTransactionCount",
"eth_getProof",
];
const plugin: Plugin = { const plugin: Plugin = {
name: "eth", name: "eth",
async plugin(api: PluginAPI): Promise<void> { async plugin(api: PluginAPI): Promise<void> {
const prover = new Prover(CONSENSUS_RPC_URL); const client = createDefaultClient(CONSENSUS_RPC_URL);
const store = new MemoryStore();
client = new Client(prover, store, CONSENSUS_RPC_URL, EXECUTION_RPC_URL);
await client.sync(); await client.sync();
client.provider.rpc.pluginApi = api;
const provider = client.provider;
api.registerMethod("consensus_committee_hashes", { api.registerMethod("consensus_updates", {
cacheable: false, cacheable: false,
async handler( async handler(
request: ConsensusCommitteeHashesRequest request: ConsensusCommitteeUpdateRequest,
): Promise<Uint8Array> { ): Promise<Uint8Array[]> {
if (!(request?.start && typeof request.start == "number")) { if (!(request?.start && typeof request.start === "number")) {
throw new Error('start required and must be a number"'); throw new Error("start required and must be a number");
} }
if (!(request?.count && typeof request.count == "number")) { if (!(request?.count && typeof request.count === "number")) {
throw new Error('count required and must be a number"'); throw new Error("count required and must be a number");
} }
request.count = Math.min(request.count, 50);
if (!client.isSynced) { if (!client.isSynced) {
await client.sync(); client.sync();
} }
let hashes; const updates: Uint8Array[] = [];
try { for (let i = 0; i < request.count; i++) {
hashes = store.getCommitteeHashes(request.start, request.count); const period = request?.start + i;
} catch { if (!client.store.hasUpdate(period)) {
await client.sync(); throw new Error(
} `update at period ${request?.start} does not exist`,
if (!hashes) {
try {
hashes = store.getCommitteeHashes(request.start, request.count);
} catch (e) {
return e;
}
}
return hashes;
},
});
api.registerMethod("consensus_committee_period", {
cacheable: false,
async handler(
request: ConsensusCommitteePeriodRequest
): Promise<Uint8Array> {
if (
!(
request?.period &&
(typeof request.period == "number" || request.period === "latest")
)
) {
throw new Error('period required and must be a number or "latest"');
}
if (!client.isSynced) {
await client.sync();
}
let committee;
try {
committee = store.getCommittee(
request.period === "latest" ? client.latestPeriod : request.period
);
} catch {
await client.sync();
}
if (!committee) {
try {
committee = store.getCommittee(
request.period === "latest" ? client.latestPeriod : request.period
); );
} catch (e) {
return e;
} }
updates.push(client.store.getUpdate(period));
} }
return committee; return updates;
},
});
api.registerMethod("execution_request", {
cacheable: false,
async handler(request: ExecutionRequest): Promise<object> {
/* const cache = provider.rpc.getCachedRequest(request);
if (cache) {
return cache;
}
if (provider.rpcMethodSupported(request.method)) {
await provider.rpcMethod(request.method, request.params);
} else {
await provider.rpc.request(request);
}
let ret = provider.rpc.getCachedRequest(request);
if (RPC_NO_CACHE.includes(request.method)) {
provider.rpc.deleteCachedRequest(request);
}*/
let ret = await provider.rpc.request(request);
// @ts-ignore
return { ...ret, id: request.id ?? ret.id };
}, },
}); });
api.registerMethod("consensus_optimistic_update", { api.registerMethod("consensus_optimistic_update", {
cacheable: false, cacheable: false,
async handler(): Promise<object> { async handler(): Promise<Uint8Array> {
return await handleGETRequest( let execInfo = await client.getLatestExecution();
`${CONSENSUS_RPC_URL}/eth/v1/beacon/light_client/optimistic_update`
); if (!execInfo) {
throw new Error("optimistic update not ready");
}
return client.latestOptimisticUpdate;
}, },
}); });
api.registerMethod("consensus_block", {
api.registerMethod("execution_request", {
cacheable: false, cacheable: false,
async handler(request: ConsensusBlockRequest): Promise<object> { async handler(request: RPCRequestRaw): Promise<object> {
try { const ret = (await executionClient.post<any>("/", request)).data;
BigInt(request?.block); return { ...ret, id: request.id ?? ret.id };
} catch {
throw new Error("block is required and must be a number");
}
const block = request?.block;
if (
BigInt(block) > BigInt(client.latestPeriod) ||
!client.blockHashCache.has(request.block)
) {
await client.sync();
}
if (
!client.blockHashCache.has(request.block) &&
!client.blockCache.has(request.block)
) {
let state;
try {
const period = computeSyncPeriodAtSlot(request.block);
state = await prover.getSyncUpdate(
period,
period,
DEFAULT_BATCH_SIZE
);
await client.getExecutionFromBlockRoot(
request.block as any,
toHexString(state.attestedHeader.beacon.bodyRoot)
);
} catch {}
}
if (client.blockCache.has(request.block)) {
client.blockCache.ttl(request.block);
return client.blockCache.get(request.block);
}
const ret = await handleGETRequest(
`${CONSENSUS_RPC_URL}/eth/v2/beacon/blocks/${request.block}`
);
client.blockCache.set(request.block, ret);
return ret;
}, },
}); });
}, },

13
tsconfig.json
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@ -1,13 +0,0 @@
{
"compilerOptions": {
"module": "esnext",
"target": "esnext",
"esModuleInterop": true,
"outDir": "dist",
"moduleResolution": "node"
},
"include": ["src"],
"exclude": [
"node_modules"
]
}