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Просмотр файла: provider-jsonrpc.ts
/**
* One of the most common ways to interact with the blockchain is
* by a node running a JSON-RPC interface which can be connected to,
* based on the transport, using:
*
* - HTTP or HTTPS - [[JsonRpcProvider]]
* - WebSocket - [[WebSocketProvider]]
* - IPC - [[IpcSocketProvider]]
*
* @_section: api/providers/jsonrpc:JSON-RPC Provider [about-jsonrpcProvider]
*/
// @TODO:
// - Add the batching API
// https://playground.open-rpc.org/?schemaUrl=https://raw.githubusercontent.com/ethereum/eth1.0-apis/assembled-spec/openrpc.json&uiSchema%5BappBar%5D%5Bui:splitView%5D=true&uiSchema%5BappBar%5D%5Bui:input%5D=false&uiSchema%5BappBar%5D%5Bui:examplesDropdown%5D=false
import { AbiCoder } from "../abi/index.js";
import { getAddress, resolveAddress } from "../address/index.js";
import { TypedDataEncoder } from "../hash/index.js";
import { accessListify } from "../transaction/index.js";
import {
defineProperties, getBigInt, hexlify, isHexString, toQuantity, toUtf8Bytes,
isError, makeError, assert, assertArgument,
FetchRequest, resolveProperties
} from "../utils/index.js";
import { AbstractProvider, UnmanagedSubscriber } from "./abstract-provider.js";
import { AbstractSigner } from "./abstract-signer.js";
import { Network } from "./network.js";
import { FilterIdEventSubscriber, FilterIdPendingSubscriber } from "./subscriber-filterid.js";
import { PollingEventSubscriber } from "./subscriber-polling.js";
import type { TypedDataDomain, TypedDataField } from "../hash/index.js";
import type { TransactionLike } from "../transaction/index.js";
import type { PerformActionRequest, Subscriber, Subscription } from "./abstract-provider.js";
import type { Networkish } from "./network.js";
import type { Provider, TransactionRequest, TransactionResponse } from "./provider.js";
import type { Signer } from "./signer.js";
type Timer = ReturnType<typeof setTimeout>;
const Primitive = "bigint,boolean,function,number,string,symbol".split(/,/g);
//const Methods = "getAddress,then".split(/,/g);
function deepCopy<T = any>(value: T): T {
if (value == null || Primitive.indexOf(typeof(value)) >= 0) {
return value;
}
// Keep any Addressable
if (typeof((<any>value).getAddress) === "function") {
return value;
}
if (Array.isArray(value)) { return <any>(value.map(deepCopy)); }
if (typeof(value) === "object") {
return Object.keys(value).reduce((accum, key) => {
accum[key] = (<any>value)[key];
return accum;
}, <any>{ });
}
throw new Error(`should not happen: ${ value } (${ typeof(value) })`);
}
function stall(duration: number): Promise<void> {
return new Promise((resolve) => { setTimeout(resolve, duration); });
}
function getLowerCase(value: string): string {
if (value) { return value.toLowerCase(); }
return value;
}
interface Pollable {
pollingInterval: number;
}
function isPollable(value: any): value is Pollable {
return (value && typeof(value.pollingInterval) === "number");
}
/**
* A JSON-RPC payload, which are sent to a JSON-RPC server.
*/
export type JsonRpcPayload = {
/**
* The JSON-RPC request ID.
*/
id: number;
/**
* The JSON-RPC request method.
*/
method: string;
/**
* The JSON-RPC request parameters.
*/
params: Array<any> | Record<string, any>;
/**
* A required constant in the JSON-RPC specification.
*/
jsonrpc: "2.0";
};
/**
* A JSON-RPC result, which are returned on success from a JSON-RPC server.
*/
export type JsonRpcResult = {
/**
* The response ID to match it to the relevant request.
*/
id: number;
/**
* The response result.
*/
result: any;
};
/**
* A JSON-RPC error, which are returned on failure from a JSON-RPC server.
*/
export type JsonRpcError = {
/**
* The response ID to match it to the relevant request.
*/
id: number;
/**
* The response error.
*/
error: {
code: number;
message?: string;
data?: any;
}
};
/**
* When subscribing to the ``"debug"`` event, the [[Listener]] will
* receive this object as the first parameter.
*/
export type DebugEventJsonRpcApiProvider = {
action: "sendRpcPayload",
payload: JsonRpcPayload | Array<JsonRpcPayload>
} | {
action: "receiveRpcResult",
result: Array<JsonRpcResult | JsonRpcError>
} | {
action: "receiveRpcError",
error: Error
};
/**
* Options for configuring a [[JsonRpcApiProvider]]. Much of this
* is targetted towards sub-classes, which often will not expose
* any of these options to their consumers.
*
* **``polling``** - use the polling strategy is used immediately
* for events; otherwise, attempt to use filters and fall back onto
* polling (default: ``false``)
*
* **``staticNetwork``** - do not request chain ID on requests to
* validate the underlying chain has not changed (default: ``null``)
*
* This should **ONLY** be used if it is **certain** that the network
* cannot change, such as when using INFURA (since the URL dictates the
* network). If the network is assumed static and it does change, this
* can have tragic consequences. For example, this **CANNOT** be used
* with MetaMask, since the user can select a new network from the
* drop-down at any time.
*
* **``batchStallTime``** - how long (ms) to aggregate requests into a
* single batch. ``0`` indicates batching will only encompass the current
* event loop. If ``batchMaxCount = 1``, this is ignored. (default: ``10``)
*
* **``batchMaxSize``** - target maximum size (bytes) to allow per batch
* request (default: 1Mb)
*
* **``batchMaxCount``** - maximum number of requests to allow in a batch.
* If ``batchMaxCount = 1``, then batching is disabled. (default: ``100``)
*
* **``cacheTimeout``** - passed as [[AbstractProviderOptions]].
*/
export type JsonRpcApiProviderOptions = {
polling?: boolean;
staticNetwork?: null | boolean | Network;
batchStallTime?: number;
batchMaxSize?: number;
batchMaxCount?: number;
cacheTimeout?: number;
pollingInterval?: number;
};
const defaultOptions = {
polling: false,
staticNetwork: null,
batchStallTime: 10, // 10ms
batchMaxSize: (1 << 20), // 1Mb
batchMaxCount: 100, // 100 requests
cacheTimeout: 250,
pollingInterval: 4000
}
/**
* A **JsonRpcTransactionRequest** is formatted as needed by the JSON-RPC
* Ethereum API specification.
*/
export interface JsonRpcTransactionRequest {
/**
* The sender address to use when signing.
*/
from?: string;
/**
* The target address.
*/
to?: string;
/**
* The transaction data.
*/
data?: string;
/**
* The chain ID the transaction is valid on.
*/
chainId?: string;
/**
* The [[link-eip-2718]] transaction type.
*/
type?: string;
/**
* The maximum amount of gas to allow a transaction to consume.
*
* In most other places in ethers, this is called ``gasLimit`` which
* differs from the JSON-RPC Ethereum API specification.
*/
gas?: string;
/**
* The gas price per wei for transactions prior to [[link-eip-1559]].
*/
gasPrice?: string;
/**
* The maximum fee per gas for [[link-eip-1559]] transactions.
*/
maxFeePerGas?: string;
/**
* The maximum priority fee per gas for [[link-eip-1559]] transactions.
*/
maxPriorityFeePerGas?: string;
/**
* The nonce for the transaction.
*/
nonce?: string;
/**
* The transaction value (in wei).
*/
value?: string;
/**
* The transaction access list.
*/
accessList?: Array<{ address: string, storageKeys: Array<string> }>;
}
// @TODO: Unchecked Signers
export class JsonRpcSigner extends AbstractSigner<JsonRpcApiProvider> {
address!: string;
constructor(provider: JsonRpcApiProvider, address: string) {
super(provider);
address = getAddress(address);
defineProperties<JsonRpcSigner>(this, { address });
}
connect(provider: null | Provider): Signer {
assert(false, "cannot reconnect JsonRpcSigner", "UNSUPPORTED_OPERATION", {
operation: "signer.connect"
});
}
async getAddress(): Promise<string> {
return this.address;
}
// JSON-RPC will automatially fill in nonce, etc. so we just check from
async populateTransaction(tx: TransactionRequest): Promise<TransactionLike<string>> {
return await this.populateCall(tx);
}
// Returns just the hash of the transaction after sent, which is what
// the bare JSON-RPC API does;
async sendUncheckedTransaction(_tx: TransactionRequest): Promise<string> {
const tx = deepCopy(_tx);
const promises: Array<Promise<void>> = [];
// Make sure the from matches the sender
if (tx.from) {
const _from = tx.from;
promises.push((async () => {
const from = await resolveAddress(_from, this.provider);
assertArgument(from != null && from.toLowerCase() === this.address.toLowerCase(),
"from address mismatch", "transaction", _tx);
tx.from = from;
})());
} else {
tx.from = this.address;
}
// The JSON-RPC for eth_sendTransaction uses 90000 gas; if the user
// wishes to use this, it is easy to specify explicitly, otherwise
// we look it up for them.
if (tx.gasLimit == null) {
promises.push((async () => {
tx.gasLimit = await this.provider.estimateGas({ ...tx, from: this.address});
})());
}
// The address may be an ENS name or Addressable
if (tx.to != null) {
const _to = tx.to;
promises.push((async () => {
tx.to = await resolveAddress(_to, this.provider);
})());
}
// Wait until all of our properties are filled in
if (promises.length) { await Promise.all(promises); }
const hexTx = this.provider.getRpcTransaction(tx);
return this.provider.send("eth_sendTransaction", [ hexTx ]);
}
async sendTransaction(tx: TransactionRequest): Promise<TransactionResponse> {
// This cannot be mined any earlier than any recent block
const blockNumber = await this.provider.getBlockNumber();
// Send the transaction
const hash = await this.sendUncheckedTransaction(tx);
// Unfortunately, JSON-RPC only provides and opaque transaction hash
// for a response, and we need the actual transaction, so we poll
// for it; it should show up very quickly
return await (new Promise((resolve, reject) => {
const timeouts = [ 1000, 100 ];
let invalids = 0;
const checkTx = async () => {
try {
// Try getting the transaction
const tx = await this.provider.getTransaction(hash);
if (tx != null) {
resolve(tx.replaceableTransaction(blockNumber));
return;
}
} catch (error) {
// If we were cancelled: stop polling.
// If the data is bad: the node returns bad transactions
// If the network changed: calling again will also fail
// If unsupported: likely destroyed
if (isError(error, "CANCELLED") || isError(error, "BAD_DATA") ||
isError(error, "NETWORK_ERROR") || isError(error, "UNSUPPORTED_OPERATION")) {
if (error.info == null) { error.info = { }; }
error.info.sendTransactionHash = hash;
reject(error);
return;
}
// Stop-gap for misbehaving backends; see #4513
if (isError(error, "INVALID_ARGUMENT")) {
invalids++;
if (error.info == null) { error.info = { }; }
error.info.sendTransactionHash = hash;
if (invalids > 10) {
reject(error);
return;
}
}
// Notify anyone that cares; but we will try again, since
// it is likely an intermittent service error
this.provider.emit("error", makeError("failed to fetch transation after sending (will try again)", "UNKNOWN_ERROR", { error }));
}
// Wait another 4 seconds
this.provider._setTimeout(() => { checkTx(); }, timeouts.pop() || 4000);
};
checkTx();
}));
}
async signTransaction(_tx: TransactionRequest): Promise<string> {
const tx = deepCopy(_tx);
// Make sure the from matches the sender
if (tx.from) {
const from = await resolveAddress(tx.from, this.provider);
assertArgument(from != null && from.toLowerCase() === this.address.toLowerCase(),
"from address mismatch", "transaction", _tx);
tx.from = from;
} else {
tx.from = this.address;
}
const hexTx = this.provider.getRpcTransaction(tx);
return await this.provider.send("eth_signTransaction", [ hexTx ]);
}
async signMessage(_message: string | Uint8Array): Promise<string> {
const message = ((typeof(_message) === "string") ? toUtf8Bytes(_message): _message);
return await this.provider.send("personal_sign", [
hexlify(message), this.address.toLowerCase() ]);
}
async signTypedData(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, _value: Record<string, any>): Promise<string> {
const value = deepCopy(_value);
// Populate any ENS names (in-place)
const populated = await TypedDataEncoder.resolveNames(domain, types, value, async (value: string) => {
const address = await resolveAddress(value);
assertArgument(address != null, "TypedData does not support null address", "value", value);
return address;
});
return await this.provider.send("eth_signTypedData_v4", [
this.address.toLowerCase(),
JSON.stringify(TypedDataEncoder.getPayload(populated.domain, types, populated.value))
]);
}
async unlock(password: string): Promise<boolean> {
return this.provider.send("personal_unlockAccount", [
this.address.toLowerCase(), password, null ]);
}
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign
async _legacySignMessage(_message: string | Uint8Array): Promise<string> {
const message = ((typeof(_message) === "string") ? toUtf8Bytes(_message): _message);
return await this.provider.send("eth_sign", [
this.address.toLowerCase(), hexlify(message) ]);
}
}
type ResolveFunc = (result: JsonRpcResult) => void;
type RejectFunc = (error: Error) => void;
type Payload = { payload: JsonRpcPayload, resolve: ResolveFunc, reject: RejectFunc };
/**
* The JsonRpcApiProvider is an abstract class and **MUST** be
* sub-classed.
*
* It provides the base for all JSON-RPC-based Provider interaction.
*
* Sub-classing Notes:
* - a sub-class MUST override _send
* - a sub-class MUST call the `_start()` method once connected
*/
export abstract class JsonRpcApiProvider extends AbstractProvider {
#options: Required<JsonRpcApiProviderOptions>;
// The next ID to use for the JSON-RPC ID field
#nextId: number;
// Payloads are queued and triggered in batches using the drainTimer
#payloads: Array<Payload>;
#drainTimer: null | Timer;
#notReady: null | {
promise: Promise<void>,
resolve: null | ((v: void) => void)
};
#network: null | Network;
#pendingDetectNetwork: null | Promise<Network>;
#scheduleDrain(): void {
if (this.#drainTimer) { return; }
// If we aren't using batching, no harm in sending it immediately
const stallTime = (this._getOption("batchMaxCount") === 1) ? 0: this._getOption("batchStallTime");
this.#drainTimer = setTimeout(() => {
this.#drainTimer = null;
const payloads = this.#payloads;
this.#payloads = [ ];
while (payloads.length) {
// Create payload batches that satisfy our batch constraints
const batch = [ <Payload>(payloads.shift()) ];
while (payloads.length) {
if (batch.length === this.#options.batchMaxCount) { break; }
batch.push(<Payload>(payloads.shift()));
const bytes = JSON.stringify(batch.map((p) => p.payload));
if (bytes.length > this.#options.batchMaxSize) {
payloads.unshift(<Payload>(batch.pop()));
break;
}
}
// Process the result to each payload
(async () => {
const payload = ((batch.length === 1) ? batch[0].payload: batch.map((p) => p.payload));
this.emit("debug", { action: "sendRpcPayload", payload });
try {
const result = await this._send(payload);
this.emit("debug", { action: "receiveRpcResult", result });
// Process results in batch order
for (const { resolve, reject, payload } of batch) {
if (this.destroyed) {
reject(makeError("provider destroyed; cancelled request", "UNSUPPORTED_OPERATION", { operation: payload.method }));
continue;
}
// Find the matching result
const resp = result.filter((r) => (r.id === payload.id))[0];
// No result; the node failed us in unexpected ways
if (resp == null) {
const error = makeError("missing response for request", "BAD_DATA", {
value: result, info: { payload }
});
this.emit("error", error);
reject(error);
continue;
}
// The response is an error
if ("error" in resp) {
reject(this.getRpcError(payload, resp));
continue;
}
// All good; send the result
resolve(resp.result);
}
} catch (error: any) {
this.emit("debug", { action: "receiveRpcError", error });
for (const { reject } of batch) {
// @TODO: augment the error with the payload
reject(error);
}
}
})();
}
}, stallTime);
}
constructor(network?: Networkish, options?: JsonRpcApiProviderOptions) {
super(network, options);
this.#nextId = 1;
this.#options = Object.assign({ }, defaultOptions, options || { });
this.#payloads = [ ];
this.#drainTimer = null;
this.#network = null;
this.#pendingDetectNetwork = null;
{
let resolve: null | ((value: void) => void) = null;
const promise = new Promise((_resolve: (value: void) => void) => {
resolve = _resolve;
});
this.#notReady = { promise, resolve };
}
const staticNetwork = this._getOption("staticNetwork");
if (typeof(staticNetwork) === "boolean") {
assertArgument(!staticNetwork || network !== "any", "staticNetwork cannot be used on special network 'any'", "options", options);
if (staticNetwork && network != null) {
this.#network = Network.from(network);
}
} else if (staticNetwork) {
// Make sure any static network is compatbile with the provided netwrok
assertArgument(network == null || staticNetwork.matches(network),
"staticNetwork MUST match network object", "options", options);
this.#network = staticNetwork;
}
}
/**
* Returns the value associated with the option %%key%%.
*
* Sub-classes can use this to inquire about configuration options.
*/
_getOption<K extends keyof JsonRpcApiProviderOptions>(key: K): JsonRpcApiProviderOptions[K] {
return this.#options[key];
}
/**
* Gets the [[Network]] this provider has committed to. On each call, the network
* is detected, and if it has changed, the call will reject.
*/
get _network(): Network {
assert (this.#network, "network is not available yet", "NETWORK_ERROR");
return this.#network;
}
/**
* Sends a JSON-RPC %%payload%% (or a batch) to the underlying channel.
*
* Sub-classes **MUST** override this.
*/
abstract _send(payload: JsonRpcPayload | Array<JsonRpcPayload>): Promise<Array<JsonRpcResult | JsonRpcError>>;
/**
* Resolves to the non-normalized value by performing %%req%%.
*
* Sub-classes may override this to modify behavior of actions,
* and should generally call ``super._perform`` as a fallback.
*/
async _perform(req: PerformActionRequest): Promise<any> {
// Legacy networks do not like the type field being passed along (which
// is fair), so we delete type if it is 0 and a non-EIP-1559 network
if (req.method === "call" || req.method === "estimateGas") {
let tx = req.transaction;
if (tx && tx.type != null && getBigInt(tx.type)) {
// If there are no EIP-1559 or newer properties, it might be pre-EIP-1559
if (tx.maxFeePerGas == null && tx.maxPriorityFeePerGas == null) {
const feeData = await this.getFeeData();
if (feeData.maxFeePerGas == null && feeData.maxPriorityFeePerGas == null) {
// Network doesn't know about EIP-1559 (and hence type)
req = Object.assign({ }, req, {
transaction: Object.assign({ }, tx, { type: undefined })
});
}
}
}
}
const request = this.getRpcRequest(req);
if (request != null) {
return await this.send(request.method, request.args);
}
return super._perform(req);
}
/**
* Sub-classes may override this; it detects the *actual* network that
* we are **currently** connected to.
*
* Keep in mind that [[send]] may only be used once [[ready]], otherwise the
* _send primitive must be used instead.
*/
async _detectNetwork(): Promise<Network> {
const network = this._getOption("staticNetwork");
if (network) {
if (network === true) {
if (this.#network) { return this.#network; }
} else {
return network;
}
}
if (this.#pendingDetectNetwork) {
return await this.#pendingDetectNetwork;
}
// If we are ready, use ``send``, which enabled requests to be batched
if (this.ready) {
this.#pendingDetectNetwork = (async () => {
try {
const result = Network.from(getBigInt(await this.send("eth_chainId", [ ])));
this.#pendingDetectNetwork = null;
return result;
} catch (error) {
this.#pendingDetectNetwork = null;
throw error;
}
})();
return await this.#pendingDetectNetwork;
}
// We are not ready yet; use the primitive _send
this.#pendingDetectNetwork = (async () => {
const payload: JsonRpcPayload = {
id: this.#nextId++, method: "eth_chainId", params: [ ], jsonrpc: "2.0"
};
this.emit("debug", { action: "sendRpcPayload", payload });
let result: JsonRpcResult | JsonRpcError;
try {
result = (await this._send(payload))[0];
this.#pendingDetectNetwork = null;
} catch (error) {
this.#pendingDetectNetwork = null;
this.emit("debug", { action: "receiveRpcError", error });
throw error;
}
this.emit("debug", { action: "receiveRpcResult", result });
if ("result" in result) {
return Network.from(getBigInt(result.result));
}
throw this.getRpcError(payload, result);
})();
return await this.#pendingDetectNetwork;
}
/**
* Sub-classes **MUST** call this. Until [[_start]] has been called, no calls
* will be passed to [[_send]] from [[send]]. If it is overridden, then
* ``super._start()`` **MUST** be called.
*
* Calling it multiple times is safe and has no effect.
*/
_start(): void {
if (this.#notReady == null || this.#notReady.resolve == null) { return; }
this.#notReady.resolve();
this.#notReady = null;
(async () => {
// Bootstrap the network
while (this.#network == null && !this.destroyed) {
try {
this.#network = await this._detectNetwork();
} catch (error) {
if (this.destroyed) { break; }
console.log("JsonRpcProvider failed to detect network and cannot start up; retry in 1s (perhaps the URL is wrong or the node is not started)");
this.emit("error", makeError("failed to bootstrap network detection", "NETWORK_ERROR", { event: "initial-network-discovery", info: { error } }));
await stall(1000);
}
}
// Start dispatching requests
this.#scheduleDrain();
})();
}
/**
* Resolves once the [[_start]] has been called. This can be used in
* sub-classes to defer sending data until the connection has been
* established.
*/
async _waitUntilReady(): Promise<void> {
if (this.#notReady == null) { return; }
return await this.#notReady.promise;
}
/**
* Return a Subscriber that will manage the %%sub%%.
*
* Sub-classes may override this to modify the behavior of
* subscription management.
*/
_getSubscriber(sub: Subscription): Subscriber {
// Pending Filters aren't availble via polling
if (sub.type === "pending") { return new FilterIdPendingSubscriber(this); }
if (sub.type === "event") {
if (this._getOption("polling")) {
return new PollingEventSubscriber(this, sub.filter);
}
return new FilterIdEventSubscriber(this, sub.filter);
}
// Orphaned Logs are handled automatically, by the filter, since
// logs with removed are emitted by it
if (sub.type === "orphan" && sub.filter.orphan === "drop-log") {
return new UnmanagedSubscriber("orphan");
}
return super._getSubscriber(sub);
}
/**
* Returns true only if the [[_start]] has been called.
*/
get ready(): boolean { return this.#notReady == null; }
/**
* Returns %%tx%% as a normalized JSON-RPC transaction request,
* which has all values hexlified and any numeric values converted
* to Quantity values.
*/
getRpcTransaction(tx: TransactionRequest): JsonRpcTransactionRequest {
const result: JsonRpcTransactionRequest = {};
// JSON-RPC now requires numeric values to be "quantity" values
["chainId", "gasLimit", "gasPrice", "type", "maxFeePerGas", "maxPriorityFeePerGas", "nonce", "value"].forEach((key) => {
if ((<any>tx)[key] == null) { return; }
let dstKey = key;
if (key === "gasLimit") { dstKey = "gas"; }
(<any>result)[dstKey] = toQuantity(getBigInt((<any>tx)[key], `tx.${ key }`));
});
// Make sure addresses and data are lowercase
["from", "to", "data"].forEach((key) => {
if ((<any>tx)[key] == null) { return; }
(<any>result)[key] = hexlify((<any>tx)[key]);
});
// Normalize the access list object
if (tx.accessList) {
result["accessList"] = accessListify(tx.accessList);
}
if (tx.blobVersionedHashes) {
// @TODO: Remove this <any> case once EIP-4844 added to prepared tx
(<any>result)["blobVersionedHashes"] = tx.blobVersionedHashes.map(h => h.toLowerCase());
}
// @TODO: blobs should probably also be copied over, optionally
// accounting for the kzg property to backfill blobVersionedHashes
// using the commitment. Or should that be left as an exercise to
// the caller?
return result;
}
/**
* Returns the request method and arguments required to perform
* %%req%%.
*/
getRpcRequest(req: PerformActionRequest): null | { method: string, args: Array<any> } {
switch (req.method) {
case "chainId":
return { method: "eth_chainId", args: [ ] };
case "getBlockNumber":
return { method: "eth_blockNumber", args: [ ] };
case "getGasPrice":
return { method: "eth_gasPrice", args: [] };
case "getPriorityFee":
return { method: "eth_maxPriorityFeePerGas", args: [ ] };
case "getBalance":
return {
method: "eth_getBalance",
args: [ getLowerCase(req.address), req.blockTag ]
};
case "getTransactionCount":
return {
method: "eth_getTransactionCount",
args: [ getLowerCase(req.address), req.blockTag ]
};
case "getCode":
return {
method: "eth_getCode",
args: [ getLowerCase(req.address), req.blockTag ]
};
case "getStorage":
return {
method: "eth_getStorageAt",
args: [
getLowerCase(req.address),
("0x" + req.position.toString(16)),
req.blockTag
]
};
case "broadcastTransaction":
return {
method: "eth_sendRawTransaction",
args: [ req.signedTransaction ]
};
case "getBlock":
if ("blockTag" in req) {
return {
method: "eth_getBlockByNumber",
args: [ req.blockTag, !!req.includeTransactions ]
};
} else if ("blockHash" in req) {
return {
method: "eth_getBlockByHash",
args: [ req.blockHash, !!req.includeTransactions ]
};
}
break;
case "getTransaction":
return {
method: "eth_getTransactionByHash",
args: [ req.hash ]
};
case "getTransactionReceipt":
return {
method: "eth_getTransactionReceipt",
args: [ req.hash ]
};
case "call":
return {
method: "eth_call",
args: [ this.getRpcTransaction(req.transaction), req.blockTag ]
};
case "estimateGas": {
return {
method: "eth_estimateGas",
args: [ this.getRpcTransaction(req.transaction) ]
};
}
case "getLogs":
if (req.filter && req.filter.address != null) {
if (Array.isArray(req.filter.address)) {
req.filter.address = req.filter.address.map(getLowerCase);
} else {
req.filter.address = getLowerCase(req.filter.address);
}
}
return { method: "eth_getLogs", args: [ req.filter ] };
}
return null;
}
/**
* Returns an ethers-style Error for the given JSON-RPC error
* %%payload%%, coalescing the various strings and error shapes
* that different nodes return, coercing them into a machine-readable
* standardized error.
*/
getRpcError(payload: JsonRpcPayload, _error: JsonRpcError): Error {
const { method } = payload;
const { error } = _error;
if (method === "eth_estimateGas" && error.message) {
const msg = error.message;
if (!msg.match(/revert/i) && msg.match(/insufficient funds/i)) {
return makeError("insufficient funds", "INSUFFICIENT_FUNDS", {
transaction: ((<any>payload).params[0]),
info: { payload, error }
});
}
}
if (method === "eth_call" || method === "eth_estimateGas") {
const result = spelunkData(error);
const e = AbiCoder.getBuiltinCallException(
(method === "eth_call") ? "call": "estimateGas",
((<any>payload).params[0]),
(result ? result.data: null)
);
e.info = { error, payload };
return e;
}
// Only estimateGas and call can return arbitrary contract-defined text, so now we
// we can process text safely.
const message = JSON.stringify(spelunkMessage(error));
if (typeof(error.message) === "string" && error.message.match(/user denied|ethers-user-denied/i)) {
const actionMap: Record<string, "requestAccess" | "sendTransaction" | "signMessage" | "signTransaction" | "signTypedData"> = {
eth_sign: "signMessage",
personal_sign: "signMessage",
eth_signTypedData_v4: "signTypedData",
eth_signTransaction: "signTransaction",
eth_sendTransaction: "sendTransaction",
eth_requestAccounts: "requestAccess",
wallet_requestAccounts: "requestAccess",
};
return makeError(`user rejected action`, "ACTION_REJECTED", {
action: (actionMap[method] || "unknown") ,
reason: "rejected",
info: { payload, error }
});
}
if (method === "eth_sendRawTransaction" || method === "eth_sendTransaction") {
const transaction = <TransactionLike<string>>((<any>payload).params[0]);
if (message.match(/insufficient funds|base fee exceeds gas limit/i)) {
return makeError("insufficient funds for intrinsic transaction cost", "INSUFFICIENT_FUNDS", {
transaction, info: { error }
});
}
if (message.match(/nonce/i) && message.match(/too low/i)) {
return makeError("nonce has already been used", "NONCE_EXPIRED", { transaction, info: { error } });
}
// "replacement transaction underpriced"
if (message.match(/replacement transaction/i) && message.match(/underpriced/i)) {
return makeError("replacement fee too low", "REPLACEMENT_UNDERPRICED", { transaction, info: { error } });
}
if (message.match(/only replay-protected/i)) {
return makeError("legacy pre-eip-155 transactions not supported", "UNSUPPORTED_OPERATION", {
operation: method, info: { transaction, info: { error } }
});
}
}
let unsupported = !!message.match(/the method .* does not exist/i);
if (!unsupported) {
if (error && (<any>error).details && (<any>error).details.startsWith("Unauthorized method:")) {
unsupported = true;
}
}
if (unsupported) {
return makeError("unsupported operation", "UNSUPPORTED_OPERATION", {
operation: payload.method, info: { error, payload }
});
}
return makeError("could not coalesce error", "UNKNOWN_ERROR", { error, payload });
}
/**
* Requests the %%method%% with %%params%% via the JSON-RPC protocol
* over the underlying channel. This can be used to call methods
* on the backend that do not have a high-level API within the Provider
* API.
*
* This method queues requests according to the batch constraints
* in the options, assigns the request a unique ID.
*
* **Do NOT override** this method in sub-classes; instead
* override [[_send]] or force the options values in the
* call to the constructor to modify this method's behavior.
*/
send(method: string, params: Array<any> | Record<string, any>): Promise<any> {
// @TODO: cache chainId?? purge on switch_networks
// We have been destroyed; no operations are supported anymore
if (this.destroyed) {
return Promise.reject(makeError("provider destroyed; cancelled request", "UNSUPPORTED_OPERATION", { operation: method }));
}
const id = this.#nextId++;
const promise = new Promise((resolve, reject) => {
this.#payloads.push({
resolve, reject,
payload: { method, params, id, jsonrpc: "2.0" }
});
});
// If there is not a pending drainTimer, set one
this.#scheduleDrain();
return <Promise<JsonRpcResult>>promise;
}
/**
* Resolves to the [[Signer]] account for %%address%% managed by
* the client.
*
* If the %%address%% is a number, it is used as an index in the
* the accounts from [[listAccounts]].
*
* This can only be used on clients which manage accounts (such as
* Geth with imported account or MetaMask).
*
* Throws if the account doesn't exist.
*/
async getSigner(address?: number | string): Promise<JsonRpcSigner> {
if (address == null) { address = 0; }
const accountsPromise = this.send("eth_accounts", [ ]);
// Account index
if (typeof(address) === "number") {
const accounts = <Array<string>>(await accountsPromise);
if (address >= accounts.length) { throw new Error("no such account"); }
return new JsonRpcSigner(this, accounts[address]);
}
const { accounts } = await resolveProperties({
network: this.getNetwork(),
accounts: accountsPromise
});
// Account address
address = getAddress(address);
for (const account of accounts) {
if (getAddress(account) === address) {
return new JsonRpcSigner(this, address);
}
}
throw new Error("invalid account");
}
async listAccounts(): Promise<Array<JsonRpcSigner>> {
const accounts: Array<string> = await this.send("eth_accounts", [ ]);
return accounts.map((a) => new JsonRpcSigner(this, a));
}
destroy(): void {
// Stop processing requests
if (this.#drainTimer) {
clearTimeout(this.#drainTimer);
this.#drainTimer = null;
}
// Cancel all pending requests
for (const { payload, reject } of this.#payloads) {
reject(makeError("provider destroyed; cancelled request", "UNSUPPORTED_OPERATION", { operation: payload.method }));
}
this.#payloads = [ ];
// Parent clean-up
super.destroy();
}
}
// @TODO: remove this in v7, it is not exported because this functionality
// is exposed in the JsonRpcApiProvider by setting polling to true. It should
// be safe to remove regardless, because it isn't reachable, but just in case.
/**
* @_ignore:
*/
export abstract class JsonRpcApiPollingProvider extends JsonRpcApiProvider {
#pollingInterval: number;
constructor(network?: Networkish, options?: JsonRpcApiProviderOptions) {
super(network, options);
let pollingInterval = this._getOption("pollingInterval");
if (pollingInterval == null) { pollingInterval = defaultOptions.pollingInterval; }
this.#pollingInterval = pollingInterval;
}
_getSubscriber(sub: Subscription): Subscriber {
const subscriber = super._getSubscriber(sub);
if (isPollable(subscriber)) {
subscriber.pollingInterval = this.#pollingInterval;
}
return subscriber;
}
/**
* The polling interval (default: 4000 ms)
*/
get pollingInterval(): number { return this.#pollingInterval; }
set pollingInterval(value: number) {
if (!Number.isInteger(value) || value < 0) { throw new Error("invalid interval"); }
this.#pollingInterval = value;
this._forEachSubscriber((sub) => {
if (isPollable(sub)) {
sub.pollingInterval = this.#pollingInterval;
}
});
}
}
/**
* The JsonRpcProvider is one of the most common Providers,
* which performs all operations over HTTP (or HTTPS) requests.
*
* Events are processed by polling the backend for the current block
* number; when it advances, all block-base events are then checked
* for updates.
*/
export class JsonRpcProvider extends JsonRpcApiPollingProvider {
#connect: FetchRequest;
constructor(url?: string | FetchRequest, network?: Networkish, options?: JsonRpcApiProviderOptions) {
if (url == null) { url = "http:/\/localhost:8545"; }
super(network, options);
if (typeof(url) === "string") {
this.#connect = new FetchRequest(url);
} else {
this.#connect = url.clone();
}
}
_getConnection(): FetchRequest {
return this.#connect.clone();
}
async send(method: string, params: Array<any> | Record<string, any>): Promise<any> {
// All requests are over HTTP, so we can just start handling requests
// We do this here rather than the constructor so that we don't send any
// requests to the network (i.e. eth_chainId) until we absolutely have to.
await this._start();
return await super.send(method, params);
}
async _send(payload: JsonRpcPayload | Array<JsonRpcPayload>): Promise<Array<JsonRpcResult>> {
// Configure a POST connection for the requested method
const request = this._getConnection();
request.body = JSON.stringify(payload);
request.setHeader("content-type", "application/json");
const response = await request.send();
response.assertOk();
let resp = response.bodyJson;
if (!Array.isArray(resp)) { resp = [ resp ]; }
return resp;
}
}
function spelunkData(value: any): null | { message: string, data: string } {
if (value == null) { return null; }
// These *are* the droids we're looking for.
if (typeof(value.message) === "string" && value.message.match(/revert/i) && isHexString(value.data)) {
return { message: value.message, data: value.data };
}
// Spelunk further...
if (typeof(value) === "object") {
for (const key in value) {
const result = spelunkData(value[key]);
if (result) { return result; }
}
return null;
}
// Might be a JSON string we can further descend...
if (typeof(value) === "string") {
try {
return spelunkData(JSON.parse(value));
} catch (error) { }
}
return null;
}
function _spelunkMessage(value: any, result: Array<string>): void {
if (value == null) { return; }
// These *are* the droids we're looking for.
if (typeof(value.message) === "string") {
result.push(value.message);
}
// Spelunk further...
if (typeof(value) === "object") {
for (const key in value) {
_spelunkMessage(value[key], result);
}
}
// Might be a JSON string we can further descend...
if (typeof(value) === "string") {
try {
return _spelunkMessage(JSON.parse(value), result);
} catch (error) { }
}
}
function spelunkMessage(value: any): Array<string> {
const result: Array<string> = [ ];
_spelunkMessage(value, result);
return result;
}
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