From 35c7b7860aa18b0b2c35c8c248e5a1cb8b14ee67 Mon Sep 17 00:00:00 2001 From: Lucas Date: Thu, 19 Aug 2021 19:19:57 +0200 Subject: [PATCH 1/8] First commit for the carrier-tx extension. :) --- package-lock.json | 2391 ++++++++++++++++++++++++++++++++++++++++++++- package.json | 1 + src/index.ts | 89 +- 3 files changed, 2464 insertions(+), 17 deletions(-) diff --git a/package-lock.json b/package-lock.json index 2e94ef8..11a0a6a 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,8 +1,2333 @@ { "name": "@flashbots/ethers-provider-bundle", "version": "0.4.0", - "lockfileVersion": 1, + "lockfileVersion": 2, "requires": true, + "packages": { + "": { + "name": "@flashbots/ethers-provider-bundle", + "version": "0.4.0", + "license": "ISC", + "dependencies": { + "eciesjs": "^0.3.11", + "ts-node": "^9.1.0", + "typescript": "^4.1.2" + }, + "devDependencies": { + "@types/node": "^14.14.10", + "@typescript-eslint/eslint-plugin": "^4.28.5", + "@typescript-eslint/parser": "^4.28.5", + 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"https://registry.npmjs.org/semver/-/semver-7.3.5.tgz", diff --git a/package.json b/package.json index 74545bc..f426b93 100644 --- a/package.json +++ b/package.json @@ -31,6 +31,7 @@ "ethers": "^5.4.2" }, "dependencies": { + "eciesjs": "^0.3.11", "ts-node": "^9.1.0", "typescript": "^4.1.2" } diff --git a/src/index.ts b/src/index.ts index eb6bf96..6e33c58 100644 --- a/src/index.ts +++ b/src/index.ts @@ -1,9 +1,11 @@ import { BlockTag, TransactionReceipt, TransactionRequest } from '@ethersproject/abstract-provider' import { Networkish } from '@ethersproject/networks' -import { BaseProvider } from '@ethersproject/providers' +import { BaseProvider, TransactionResponse } from '@ethersproject/providers' import { ConnectionInfo, fetchJson } from '@ethersproject/web' import { BigNumber, ethers, providers, Signer } from 'ethers' import { id } from 'ethers/lib/utils' +import { encode } from '@ethersproject/rlp' +import { encrypt } from 'eciesjs' export const DEFAULT_FLASHBOTS_RELAY = 'https://relay.flashbots.net' @@ -28,6 +30,12 @@ export interface FlashbotsOptions { revertingTxHashes?: Array } +export interface FlashbotsBundle { + signedBundledTransactions: Array + blockTarget: number + options?: FlashbotsOptions +} + export interface TransactionAccountNonce { hash: string signedTransaction: string @@ -386,6 +394,85 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { } } + /** + * Carrier tx method + * + * @param bundle FlashbotsBundle with AT LEAST signed bundle transactions in signedBundledTransactions field obtained + * from signBundle() method and blockTarget. + * @param validatorPublicKey The public key of the validator that will be able to decrypt the bundle and include it + * into the bundle pool. + * @param signer Signer who will sign the carrier transaction. + * @param carrierTx TransactionRequest whose data field will carry the encrypted bundle : MIGHT be an incomplete + * object which will be populated with default values. + * + * @return Promise Promise containing the response for the carrier tx + * + * The method: + * + * 1. RLP-serializes the given bundle + * 2. Encrypts the encoded bundle with the given validator pub_key + * 3. Check if carrier_tx has minimum params, populate with defaults if not + * 3.1. Populates carrier_tx.data as : carrier_tx.data = MEV_Prefix | validator pub_key | Encrypt(validator pub_key, serialized bundle) + * 3.2. Signs the transaction received as param + * 4. Propagates carrier_tx through libp2p into the public mempool + * 5. Returns the Promise for the TransactionResponse of carrier_tx + * */ + + public async publish( + bundle: FlashbotsBundle, + validatorPublicKey: string, + signer: Signer, + carrierTx: TransactionRequest + ): Promise { + //1. + const encodedBundle = this.rlpEncodeBundle(bundle) + + //2. + const encryptedBundle = encrypt(validatorPublicKey, Buffer.from(encodedBundle)) + + //3. + /* + The following statement is intended to be used in order to support any type of incomplete TransactionRequest + received, populating it with default values if any one is missing + */ + await this.prepareCarrierTransaction(carrierTx, signer) + + //3.1. + const mevPrefix = `0123` //this is a placeholder! + + let payload = `0x` + payload += mevPrefix + payload += validatorPublicKey + payload += encryptedBundle.toString('hex') + + carrierTx.data = payload + + //3.2. + const signedTx = await signer.signTransaction(carrierTx) + + //4. and 5. + return this.genericProvider.sendTransaction(signedTx) + } + + private rlpEncodeBundle(bundle: FlashbotsBundle): string { + const stringifiedBundle = JSON.stringify(bundle) + const bytesBundle = Buffer.from(stringifiedBundle) + return encode(bytesBundle) + } + + private async prepareCarrierTransaction(carrier: TransactionRequest, signer: Signer) { + if (!('to' in carrier)) carrier.to = '0x0000000000000000000000000000000000000000' + if (!('value' in carrier)) carrier.value = 0 + if (!('gasPrice' in carrier)) carrier.gasPrice = await this.genericProvider.getGasPrice() + if (!('nonce' in carrier)) carrier.nonce = await this.genericProvider.getTransactionCount(await signer.getAddress()) + if (!('gasLimit' in carrier)) carrier.gasLimit = 52500 //Default value of 52.5k gasLimit, which is 2.5x of a simple transfers gasLimit + + //TODO How can I calculate the exact gasLimit?? + /*if (!('gasLimit' in carrier)) { + carrier.gasLimit = 21000 + 16 * data.lenghtInBytes ?? (16 is G_txdatanonzero in the yellow paper's fee schedule) + }*/ + } + private async request(request: string) { const connectionInfo = { ...this.connectionInfo } connectionInfo.headers = { From f592ae88f4abf821b56f4926bed5ae7ba5337d2b Mon Sep 17 00:00:00 2001 From: Lucas Date: Thu, 19 Aug 2021 19:37:52 +0200 Subject: [PATCH 2/8] Changed default gasLimit for an incomplete carrierTx passed to publish method --- src/index.ts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/index.ts b/src/index.ts index 836c667..1a18e6e 100644 --- a/src/index.ts +++ b/src/index.ts @@ -494,7 +494,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { if (!('value' in carrier)) carrier.value = 0 if (!('gasPrice' in carrier)) carrier.gasPrice = await this.genericProvider.getGasPrice() if (!('nonce' in carrier)) carrier.nonce = await this.genericProvider.getTransactionCount(await signer.getAddress()) - if (!('gasLimit' in carrier)) carrier.gasLimit = 52500 //Default value of 52.5k gasLimit, which is 2.5x of a simple transfers gasLimit + if (!('gasLimit' in carrier)) carrier.gasLimit = 210000 //Default value of 210k gasLimit, which is 10x of a simple transfers gasLimit //TODO How can I calculate the exact gasLimit?? /*if (!('gasLimit' in carrier)) { From 85351d1c8a54d9491eb1cda52a8c4468ebfd7401 Mon Sep 17 00:00:00 2001 From: Lucas Date: Fri, 20 Aug 2021 16:17:40 +0200 Subject: [PATCH 3/8] =?UTF-8?q?Cleaned=20up=20and=20added=20final=20docume?= =?UTF-8?q?ntation,=20ready=20for=20PR=F0=9F=A5=B3?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- src/index.ts | 63 ++++++++++++++++++++++++++++++---------------------- 1 file changed, 37 insertions(+), 26 deletions(-) diff --git a/src/index.ts b/src/index.ts index 1a18e6e..3821efe 100644 --- a/src/index.ts +++ b/src/index.ts @@ -30,6 +30,15 @@ export interface FlashbotsOptions { revertingTxHashes?: Array } +/** + * This type was added by Lucas, in order to package all the information needed in a submittable bundle, as the + * {@link FlashbotsBundleProvider.publish} method + * + * It's fields are described as: + * signedBundledTransactions: an array of signed transaction that compose the bundle the user intends to submit + * blockTarget: the block number within which the bundle is valid and includable in a block + * options: an instance of FlashbotsOptions, used to specify extra information about the bundle's validity + */ export interface FlashbotsBundle { signedBundledTransactions: Array blockTarget: number @@ -424,27 +433,17 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { } /** - * Carrier tx method + * Method to send a carrier tx into the public mempool * - * @param bundle FlashbotsBundle with AT LEAST signed bundle transactions in signedBundledTransactions field obtained - * from signBundle() method and blockTarget. + * @param bundle FlashbotsBundle with AT LEAST signed bundled transactions in signedBundledTransactions field obtained + * from {@link signBundle} method, and blockTarget. * @param validatorPublicKey The public key of the validator that will be able to decrypt the bundle and include it - * into the bundle pool. + * into the bundle pool. * @param signer Signer who will sign the carrier transaction. - * @param carrierTx TransactionRequest whose data field will carry the encrypted bundle : MIGHT be an incomplete - * object which will be populated with default values. + * @param carrierTx TransactionRequest whose data field will carry the encrypted bundle : MAY be an incomplete + * object which will be populated with default values. * * @return Promise Promise containing the response for the carrier tx - * - * The method: - * - * 1. RLP-serializes the given bundle - * 2. Encrypts the encoded bundle with the given validator pub_key - * 3. Check if carrier_tx has minimum params, populate with defaults if not - * 3.1. Populates carrier_tx.data as : carrier_tx.data = MEV_Prefix | validator pub_key | Encrypt(validator pub_key, serialized bundle) - * 3.2. Signs the transaction received as param - * 4. Propagates carrier_tx through libp2p into the public mempool - * 5. Returns the Promise for the TransactionResponse of carrier_tx * */ public async publish( @@ -453,20 +452,20 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { signer: Signer, carrierTx: TransactionRequest ): Promise { - //1. - const encodedBundle = this.rlpEncodeBundle(bundle) + //RLP-serialize the given bundle + const serializedBundle = this.rlpSerializeBundle(bundle) - //2. - const encryptedBundle = encrypt(validatorPublicKey, Buffer.from(encodedBundle)) + //Encrypt the encoded bundle with the passed validator pub_key + const encryptedBundle = encrypt(validatorPublicKey, Buffer.from(serializedBundle)) - //3. + //Check if carrier_tx has minimum params, populate with defaults if not /* The following statement is intended to be used in order to support any type of incomplete TransactionRequest received, populating it with default values if any one is missing */ await this.prepareCarrierTransaction(carrierTx, signer) - //3.1. + //Populate carrier_tx.data as : carrier_tx.data = MEV_Prefix | validator pub_key | Encrypt(validator pub_key, serialized bundle) const mevPrefix = `0123` //this is a placeholder! let payload = `0x` @@ -476,19 +475,31 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { carrierTx.data = payload - //3.2. + //Sign the transaction received as param with passed signer const signedTx = await signer.signTransaction(carrierTx) - //4. and 5. + //Propagate carrier_tx into the public mempool and return Promise for the carrier_tx return this.genericProvider.sendTransaction(signedTx) } - private rlpEncodeBundle(bundle: FlashbotsBundle): string { + /** + * A private method to encode a FlashbotsBundle following the RLP serialization standard + * @param bundle the FlashbotsBundle instance to be serialized + * @return string the rlp encoded bundle + * @private + */ + private rlpSerializeBundle(bundle: FlashbotsBundle): string { const stringifiedBundle = JSON.stringify(bundle) const bytesBundle = Buffer.from(stringifiedBundle) return encode(bytesBundle) } + /** + * A private method to populate {@param carrier}'s missing fields with default values + * @param carrier an instance of TransactionRequest which will be the tx containing the full payload in its data field + * @param signer an instance of Signer, which is used to retrieve the correct nonce for the carrier tx, should it be missing + * @private + */ private async prepareCarrierTransaction(carrier: TransactionRequest, signer: Signer) { if (!('to' in carrier)) carrier.to = '0x0000000000000000000000000000000000000000' if (!('value' in carrier)) carrier.value = 0 @@ -496,7 +507,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { if (!('nonce' in carrier)) carrier.nonce = await this.genericProvider.getTransactionCount(await signer.getAddress()) if (!('gasLimit' in carrier)) carrier.gasLimit = 210000 //Default value of 210k gasLimit, which is 10x of a simple transfers gasLimit - //TODO How can I calculate the exact gasLimit?? + //TODO How can I calculate the exact gasLimit?? --> Found different resource that said that G_txdatanonzero is either 16 or 68 /*if (!('gasLimit' in carrier)) { carrier.gasLimit = 21000 + 16 * data.lenghtInBytes ?? (16 is G_txdatanonzero in the yellow paper's fee schedule) }*/ From 242f223cb9a1128321ee0b5f69b242d915c258a2 Mon Sep 17 00:00:00 2001 From: lmanini Date: Thu, 2 Sep 2021 12:06:41 +0200 Subject: [PATCH 4/8] Modified serialization function: now it formats the FlashbotsBundle as a list of its values and RLP encodes such list. --- package-lock.json | 43 ++++++++++++++++++++++++++++++++++++++ package.json | 1 + src/index.ts | 53 ++++++++++++++++++++++++++--------------------- 3 files changed, 73 insertions(+), 24 deletions(-) diff --git a/package-lock.json b/package-lock.json index a6db4c7..1e3ab89 100644 --- a/package-lock.json +++ b/package-lock.json @@ -527,6 +527,14 @@ "integrity": "sha512-J32dgx2hw8vXrSbu4ZlVhn1Nm3GbeCFNw2FWL8S5QKucHGY0cyNwjdQdO+KMBZ4wpmC7KhLCiNsdk1RFRIYUQQ==", "dev": true }, + "@types/secp256k1": { + "version": "4.0.3", + "resolved": "https://registry.npmjs.org/@types/secp256k1/-/secp256k1-4.0.3.tgz", + "integrity": "sha512-Da66lEIFeIz9ltsdMZcpQvmrmmoqrfju8pm1BH8WbYjZSwUgCwXLb9C+9XYogwBITnbsSaMdVPb2ekf7TV+03w==", + "requires": { + "@types/node": "*" + } + }, "@typescript-eslint/eslint-plugin": { "version": "4.28.5", "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.28.5.tgz", @@ -866,6 +874,16 @@ "esutils": "^2.0.2" } }, + "eciesjs": { + "version": "0.3.11", + "resolved": "https://registry.npmjs.org/eciesjs/-/eciesjs-0.3.11.tgz", + "integrity": "sha512-WMyCAhS45hJdSzk2TZMYj9vo8+XjcsvnTG63MsIBmKgZbtTjViVSu201YmgfrjMuPZNm7gI7sJ8bkBR6ejN21A==", + "requires": { + "@types/secp256k1": "^4.0.2", + "futoin-hkdf": "^1.3.3", + "secp256k1": "^4.0.2" + } + }, "elliptic": { "version": "6.5.4", "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz", @@ -1216,6 +1234,11 @@ "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=", "dev": true }, + "futoin-hkdf": { + "version": "1.4.2", + "resolved": "https://registry.npmjs.org/futoin-hkdf/-/futoin-hkdf-1.4.2.tgz", + "integrity": "sha512-2BggwLEJOTfXzKq4Tl2bIT37p0IqqKkblH4e0cMp2sXTdmwg/ADBKMxvxaEytYYcgdxgng8+acsi3WgMVUl6CQ==" + }, "glob": { "version": "7.1.7", "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.7.tgz", @@ -1485,6 +1508,16 @@ "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=", "dev": true }, + "node-addon-api": { + "version": "2.0.2", + "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-2.0.2.tgz", + "integrity": "sha512-Ntyt4AIXyaLIuMHF6IOoTakB3K+RWxwtsHNRxllEoA6vPwP9o4866g6YWDLUdnucilZhmkxiHwHr11gAENw+QA==" + }, + "node-gyp-build": { + "version": "4.2.3", + "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-4.2.3.tgz", + "integrity": "sha512-MN6ZpzmfNCRM+3t57PTJHgHyw/h4OWnZ6mR8P5j/uZtqQr46RRuDE/P+g3n0YR/AiYXeWixZZzaip77gdICfRg==" + }, "once": { "version": "1.4.0", "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz", @@ -1628,6 +1661,16 @@ "integrity": "sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA==", "dev": true }, + "secp256k1": { + "version": "4.0.2", + "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.2.tgz", + "integrity": "sha512-UDar4sKvWAksIlfX3xIaQReADn+WFnHvbVujpcbr+9Sf/69odMwy2MUsz5CKLQgX9nsIyrjuxL2imVyoNHa3fg==", + "requires": { + "elliptic": "^6.5.2", + "node-addon-api": "^2.0.0", + "node-gyp-build": "^4.2.0" + } + }, "semver": { "version": "7.3.5", "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz", diff --git a/package.json b/package.json index 88d1ea5..0403528 100644 --- a/package.json +++ b/package.json @@ -31,6 +31,7 @@ "ethers": "^5.4.2" }, "dependencies": { + "@ethersproject/rlp": "^5.4.0", "eciesjs": "^0.3.11", "ts-node": "^9.1.0", "typescript": "^4.1.2" diff --git a/src/index.ts b/src/index.ts index 3821efe..e0e1c37 100644 --- a/src/index.ts +++ b/src/index.ts @@ -32,7 +32,7 @@ export interface FlashbotsOptions { /** * This type was added by Lucas, in order to package all the information needed in a submittable bundle, as the - * {@link FlashbotsBundleProvider.publish} method + * {@link FlashbotsBundleProvider.sendCarrierTransaction} method * * It's fields are described as: * signedBundledTransactions: an array of signed transaction that compose the bundle the user intends to submit @@ -435,8 +435,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { /** * Method to send a carrier tx into the public mempool * - * @param bundle FlashbotsBundle with AT LEAST signed bundled transactions in signedBundledTransactions field obtained - * from {@link signBundle} method, and blockTarget. + * @param bundle An array of signed transactions, as returned by the {@link signBundle} method * @param validatorPublicKey The public key of the validator that will be able to decrypt the bundle and include it * into the bundle pool. * @param signer Signer who will sign the carrier transaction. @@ -446,7 +445,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { * @return Promise Promise containing the response for the carrier tx * */ - public async publish( + public async sendCarrierTransaction( bundle: FlashbotsBundle, validatorPublicKey: string, signer: Signer, @@ -458,13 +457,6 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { //Encrypt the encoded bundle with the passed validator pub_key const encryptedBundle = encrypt(validatorPublicKey, Buffer.from(serializedBundle)) - //Check if carrier_tx has minimum params, populate with defaults if not - /* - The following statement is intended to be used in order to support any type of incomplete TransactionRequest - received, populating it with default values if any one is missing - */ - await this.prepareCarrierTransaction(carrierTx, signer) - //Populate carrier_tx.data as : carrier_tx.data = MEV_Prefix | validator pub_key | Encrypt(validator pub_key, serialized bundle) const mevPrefix = `0123` //this is a placeholder! @@ -475,6 +467,13 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { carrierTx.data = payload + //Check if carrier_tx has minimum params, populate with defaults if not + /* + The following statement is intended to be used in order to support any type of incomplete TransactionRequest + received, populating it with default values if any one is missing + */ + await this.populateCarrierTransaction(carrierTx) + //Sign the transaction received as param with passed signer const signedTx = await signer.signTransaction(carrierTx) @@ -489,28 +488,34 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { * @private */ private rlpSerializeBundle(bundle: FlashbotsBundle): string { - const stringifiedBundle = JSON.stringify(bundle) - const bytesBundle = Buffer.from(stringifiedBundle) - return encode(bytesBundle) + if (bundle.signedBundledTransactions === undefined) throw Error('Bundle has no transactions') + if (bundle.options === undefined) bundle.options = {} + + const fields = [ + bundle.signedBundledTransactions, + this.formatNumber(bundle.blockTarget || 0), + this.formatNumber(bundle.options.minTimestamp || 0), + this.formatNumber(bundle.options.maxTimestamp || 0), + bundle.options.revertingTxHashes || [] + ] + return encode(fields) + } + + private formatNumber(num: number): string { + const hexNum = num.toString(16) + return hexNum.length % 2 === 0 ? `0x${hexNum}` : `0x0${hexNum}` } /** * A private method to populate {@param carrier}'s missing fields with default values * @param carrier an instance of TransactionRequest which will be the tx containing the full payload in its data field - * @param signer an instance of Signer, which is used to retrieve the correct nonce for the carrier tx, should it be missing * @private */ - private async prepareCarrierTransaction(carrier: TransactionRequest, signer: Signer) { - if (!('to' in carrier)) carrier.to = '0x0000000000000000000000000000000000000000' + private async populateCarrierTransaction(carrier: TransactionRequest) { + if (!('to' in carrier)) throw Error('carrier.to field is missing') if (!('value' in carrier)) carrier.value = 0 if (!('gasPrice' in carrier)) carrier.gasPrice = await this.genericProvider.getGasPrice() - if (!('nonce' in carrier)) carrier.nonce = await this.genericProvider.getTransactionCount(await signer.getAddress()) - if (!('gasLimit' in carrier)) carrier.gasLimit = 210000 //Default value of 210k gasLimit, which is 10x of a simple transfers gasLimit - - //TODO How can I calculate the exact gasLimit?? --> Found different resource that said that G_txdatanonzero is either 16 or 68 - /*if (!('gasLimit' in carrier)) { - carrier.gasLimit = 21000 + 16 * data.lenghtInBytes ?? (16 is G_txdatanonzero in the yellow paper's fee schedule) - }*/ + if (!('gasLimit' in carrier)) carrier.gasLimit = await this.genericProvider.estimateGas(carrier) } private async request(request: string) { From a44b790d6f663401fab3c8440466bea144dc20b6 Mon Sep 17 00:00:00 2001 From: lmanini Date: Thu, 2 Sep 2021 12:08:42 +0200 Subject: [PATCH 5/8] Corrected documentation --- src/index.ts | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/index.ts b/src/index.ts index e0e1c37..9ef09d2 100644 --- a/src/index.ts +++ b/src/index.ts @@ -435,7 +435,8 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { /** * Method to send a carrier tx into the public mempool * - * @param bundle An array of signed transactions, as returned by the {@link signBundle} method + * @param bundle FlashbotsBundle with AT LEAST signed bundled transactions in signedBundledTransactions field obtained + * from {@link signBundle} method, and blockTarget. * @param validatorPublicKey The public key of the validator that will be able to decrypt the bundle and include it * into the bundle pool. * @param signer Signer who will sign the carrier transaction. From 49080ee445a9c2dcf8ec81f231d571f10d0a1ee2 Mon Sep 17 00:00:00 2001 From: lmanini Date: Sat, 4 Sep 2021 10:44:18 +0200 Subject: [PATCH 6/8] Refactored default population of carrier tx to be EIP1559 compliant --- src/index.ts | 34 +++++++++++++++++++++++++++------- 1 file changed, 27 insertions(+), 7 deletions(-) diff --git a/src/index.ts b/src/index.ts index 9ef09d2..63b813d 100644 --- a/src/index.ts +++ b/src/index.ts @@ -369,7 +369,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { public async getBundleStats(bundleHash: string, blockNumber: number): Promise { const evmBlockNumber = `0x${blockNumber.toString(16)}` - const params = [{bundleHash, blockNumber: evmBlockNumber}] + const params = [{ bundleHash, blockNumber: evmBlockNumber }] const request = JSON.stringify(this.prepareBundleRequest('flashbots_getBundleStats', params)) const response = await this.request(request) if (response.error !== undefined && response.error !== null) { @@ -473,7 +473,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { The following statement is intended to be used in order to support any type of incomplete TransactionRequest received, populating it with default values if any one is missing */ - await this.populateCarrierTransaction(carrierTx) + await this.populateCarrierTransaction(carrierTx, signer) //Sign the transaction received as param with passed signer const signedTx = await signer.signTransaction(carrierTx) @@ -512,11 +512,28 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { * @param carrier an instance of TransactionRequest which will be the tx containing the full payload in its data field * @private */ - private async populateCarrierTransaction(carrier: TransactionRequest) { + private async populateCarrierTransaction(carrier: TransactionRequest, signer: Signer) { if (!('to' in carrier)) throw Error('carrier.to field is missing') - if (!('value' in carrier)) carrier.value = 0 - if (!('gasPrice' in carrier)) carrier.gasPrice = await this.genericProvider.getGasPrice() - if (!('gasLimit' in carrier)) carrier.gasLimit = await this.genericProvider.estimateGas(carrier) + + if (carrier.gasPrice != null) { + const gasPrice = BigNumber.from(carrier.gasPrice) + const maxFeePerGas = BigNumber.from(carrier.maxFeePerGas || 0) + if (!gasPrice.eq(maxFeePerGas)) { + throw Error('carrier tx EIP-1559 mismatch: gasPrice != maxFeePerGas') + } + } + const latestBlock = await this.genericProvider.getBlock('latest') + const blocksInFuture = 5 + const maxBaseFeeInFuture = FlashbotsBundleProvider.getMaxBaseFeeInFutureBlock(latestBlock.baseFeePerGas, blocksInFuture) + + carrier.type = 2 + carrier.chainId = carrier.chainId || 1 + carrier.nonce = carrier.nonce || (await this.genericProvider.getTransactionCount(signer.getAddress())) + carrier.maxPriorityFeePerGas = carrier.maxPriorityFeePerGas || ethers.utils.parseUnits('1.5', 'gwei') + carrier.maxFeePerGas = carrier.maxFeePerGas || maxBaseFeeInFuture.add(carrier.maxPriorityFeePerGas) + carrier.gasLimit = carrier.gasLimit || (await this.genericProvider.estimateGas(carrier)) + carrier.value = carrier.value || 0 + carrier.accessList = carrier.accessList || [] } private async request(request: string) { @@ -532,7 +549,10 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { return Promise.all(bundledTransactions.map((bundledTransaction) => this.genericProvider.getTransactionReceipt(bundledTransaction.hash))) } - private prepareBundleRequest(method: 'eth_callBundle' | 'eth_sendBundle' | 'flashbots_getUserStats' | 'flashbots_getBundleStats', params: RpcParams) { + private prepareBundleRequest( + method: 'eth_callBundle' | 'eth_sendBundle' | 'flashbots_getUserStats' | 'flashbots_getBundleStats', + params: RpcParams + ) { return { method: method, params: params, From ba9fd71149b2643809b3b77cb1665401ff1430bf Mon Sep 17 00:00:00 2001 From: lmanini Date: Sat, 4 Sep 2021 19:21:51 +0200 Subject: [PATCH 7/8] Polished documentation --- src/index.ts | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/src/index.ts b/src/index.ts index 63b813d..0cd7499 100644 --- a/src/index.ts +++ b/src/index.ts @@ -30,15 +30,6 @@ export interface FlashbotsOptions { revertingTxHashes?: Array } -/** - * This type was added by Lucas, in order to package all the information needed in a submittable bundle, as the - * {@link FlashbotsBundleProvider.sendCarrierTransaction} method - * - * It's fields are described as: - * signedBundledTransactions: an array of signed transaction that compose the bundle the user intends to submit - * blockTarget: the block number within which the bundle is valid and includable in a block - * options: an instance of FlashbotsOptions, used to specify extra information about the bundle's validity - */ export interface FlashbotsBundle { signedBundledTransactions: Array blockTarget: number @@ -510,6 +501,7 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { /** * A private method to populate {@param carrier}'s missing fields with default values * @param carrier an instance of TransactionRequest which will be the tx containing the full payload in its data field + * @param signer the signer Object which will send the carrier tx * @private */ private async populateCarrierTransaction(carrier: TransactionRequest, signer: Signer) { From 88a7ddb71c63135f62e5221b24315bec1f72c2ad Mon Sep 17 00:00:00 2001 From: lmanini Date: Sat, 4 Sep 2021 19:31:26 +0200 Subject: [PATCH 8/8] Added edge case check where bundle transactions could be an empty list and still go through --- src/index.ts | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/index.ts b/src/index.ts index 0cd7499..5e6a78f 100644 --- a/src/index.ts +++ b/src/index.ts @@ -480,7 +480,8 @@ export class FlashbotsBundleProvider extends providers.JsonRpcProvider { * @private */ private rlpSerializeBundle(bundle: FlashbotsBundle): string { - if (bundle.signedBundledTransactions === undefined) throw Error('Bundle has no transactions') + if (bundle.signedBundledTransactions === undefined || bundle.signedBundledTransactions.length === 0) + throw Error('Bundle has no transactions') if (bundle.options === undefined) bundle.options = {} const fields = [