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metamask-extension/app/scripts/controllers/network/provider-api-tests/no-block-param.ts
Elliot Winkler 26db0aee46
Convert NetworkController net client tests to TS (#18490)
In order to be able to better compare differences between the version of
NetworkController in this repo and the version in the `core` repo before
we replace this version with the `core` version, this commit converts
the NetworkController network client tests to TypeScript.

The added types here are copied from the `core` repo. We plan on
making more improvements on the `core` side at some point to polish the
tests and types and reduce some of the duplication, but for now we're
just trying to keep things as similar as possible.
2023-04-14 10:21:29 -06:00

978 lines
36 KiB
TypeScript

/* eslint-disable jest/require-top-level-describe, jest/no-export */
import {
ProviderType,
waitForPromiseToBeFulfilledAfterRunningAllTimers,
withMockedCommunications,
withNetworkClient,
} from './helpers';
import {
buildFetchFailedErrorMessage,
buildInfuraClientRetriesExhaustedErrorMessage,
buildJsonRpcEngineEmptyResponseErrorMessage,
} from './shared-tests';
type TestsForRpcMethodAssumingNoBlockParamOptions = {
providerType: ProviderType;
numberOfParameters: number;
};
/**
* Defines tests which exercise the behavior exhibited by an RPC method which is
* assumed to not take a block parameter. Even if it does, the value of this
* parameter will not be used in determining how to cache the method.
*
* @param method - The name of the RPC method under test.
* @param additionalArgs - Additional arguments.
* @param additionalArgs.numberOfParameters - The number of parameters supported by the method under test.
* @param additionalArgs.providerType - The type of provider being tested;
* either `infura` or `custom` (default: "infura").
*/
export function testsForRpcMethodAssumingNoBlockParam(
method: string,
{
numberOfParameters,
providerType,
}: TestsForRpcMethodAssumingNoBlockParamOptions,
) {
if (providerType !== 'infura' && providerType !== 'custom') {
throw new Error(
`providerType must be either "infura" or "custom", was "${providerType}" instead`,
);
}
it('does not hit the RPC endpoint more than once for identical requests', async () => {
const requests = [{ method }, { method }];
const mockResults = ['first result', 'second result'];
await withMockedCommunications({ providerType }, async (comms) => {
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request: requests[0],
response: { result: mockResults[0] },
});
const results = await withNetworkClient(
{ providerType },
({ makeRpcCallsInSeries }) => makeRpcCallsInSeries(requests),
);
expect(results).toStrictEqual([mockResults[0], mockResults[0]]);
});
});
for (const paramIndex of [...Array(numberOfParameters).keys()]) {
it(`does not reuse the result of a previous request if parameter at index "${paramIndex}" differs`, async () => {
const firstMockParams = [
...new Array(numberOfParameters).fill('some value'),
];
const secondMockParams = firstMockParams.slice();
secondMockParams[paramIndex] = 'another value';
const requests = [
{
method,
params: firstMockParams,
},
{ method, params: secondMockParams },
];
const mockResults = ['some result', 'another result'];
await withMockedCommunications({ providerType }, async (comms) => {
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request: requests[0],
response: { result: mockResults[0] },
});
comms.mockRpcCall({
request: requests[1],
response: { result: mockResults[1] },
});
const results = await withNetworkClient(
{ providerType },
({ makeRpcCallsInSeries }) => makeRpcCallsInSeries(requests),
);
expect(results).toStrictEqual([mockResults[0], mockResults[1]]);
});
});
}
it('hits the RPC endpoint and does not reuse the result of a previous request if the latest block number was updated since', async () => {
const requests = [{ method }, { method }];
const mockResults = ['first result', 'second result'];
await withMockedCommunications({ providerType }, async (comms) => {
// Note that we have to mock these requests in a specific order. The
// first block tracker request occurs because of the first RPC request.
// The second block tracker request, however, does not occur because of
// the second RPC request, but rather because we call `clock.runAll()`
// below.
comms.mockNextBlockTrackerRequest({ blockNumber: '0x1' });
comms.mockRpcCall({
request: requests[0],
response: { result: mockResults[0] },
});
comms.mockNextBlockTrackerRequest({ blockNumber: '0x2' });
comms.mockRpcCall({
request: requests[1],
response: { result: mockResults[1] },
});
const results = await withNetworkClient(
{ providerType },
async (client) => {
const firstResult = await client.makeRpcCall(requests[0]);
// Proceed to the next iteration of the block tracker so that a new
// block is fetched and the current block is updated.
client.clock.runAll();
const secondResult = await client.makeRpcCall(requests[1]);
return [firstResult, secondResult];
},
);
expect(results).toStrictEqual(mockResults);
});
});
for (const emptyValue of [null, undefined, '\u003cnil\u003e']) {
it(`does not retry an empty response of "${emptyValue}"`, async () => {
const request = { method };
const mockResult = emptyValue;
await withMockedCommunications({ providerType }, async (comms) => {
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: { result: mockResult },
});
const result = await withNetworkClient(
{ providerType },
({ makeRpcCall }) => makeRpcCall(request),
);
expect(result).toStrictEqual(mockResult);
});
});
it(`does not reuse the result of a previous request if it was "${emptyValue}"`, async () => {
const requests = [{ method }, { method }];
const mockResults = [emptyValue, 'some result'];
await withMockedCommunications({ providerType }, async (comms) => {
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request: requests[0],
response: { result: mockResults[0] },
});
comms.mockRpcCall({
request: requests[1],
response: { result: mockResults[1] },
});
const results = await withNetworkClient(
{ providerType },
({ makeRpcCallsInSeries }) => makeRpcCallsInSeries(requests),
);
expect(results).toStrictEqual(mockResults);
});
});
}
it('queues requests while a previous identical call is still pending, then runs the queue when it finishes, reusing the result from the first request', async () => {
const requests = [{ method }, { method }, { method }];
const mockResults = ['first result', 'second result', 'third result'];
await withMockedCommunications({ providerType }, async (comms) => {
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request: requests[0],
response: { result: mockResults[0] },
delay: 100,
});
comms.mockRpcCall({
request: requests[1],
response: { result: mockResults[1] },
});
comms.mockRpcCall({
request: requests[2],
response: { result: mockResults[2] },
});
const results = await withNetworkClient(
{ providerType },
async (client) => {
const resultPromises = [
client.makeRpcCall(requests[0]),
client.makeRpcCall(requests[1]),
client.makeRpcCall(requests[2]),
];
const firstResult = await resultPromises[0];
// The inflight cache middleware uses setTimeout to run the handlers,
// so run them now
client.clock.runAll();
const remainingResults = await Promise.all(resultPromises.slice(1));
return [firstResult, ...remainingResults];
},
);
expect(results).toStrictEqual([
mockResults[0],
mockResults[0],
mockResults[0],
]);
});
});
it('throws a custom error if the request to the RPC endpoint returns a 405 response', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
httpStatus: 405,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
'The method does not exist / is not available',
);
});
});
// There is a difference in how we are testing the Infura middleware vs. the
// custom RPC middleware (or, more specifically, the fetch middleware) because
// of what both middleware treat as rate limiting errors. In this case, the
// fetch middleware treats a 418 response from the RPC endpoint as such an
// error, whereas to the Infura middleware, it is a 429 response.
if (providerType === 'infura') {
it('throws an undescriptive error if the request to the RPC endpoint returns a 418 response', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { id: 123, method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
httpStatus: 418,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
'{"id":123,"jsonrpc":"2.0"}',
);
});
});
it('throws an error with a custom message if the request to the RPC endpoint returns a 429 response', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
httpStatus: 429,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
'Request is being rate limited',
);
});
});
} else {
it('throws a custom error if the request to the RPC endpoint returns a 418 response', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
httpStatus: 418,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
'Request is being rate limited.',
);
});
});
it('throws an undescriptive error if the request to the RPC endpoint returns a 429 response', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
httpStatus: 429,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
"Non-200 status code: '429'",
);
});
});
}
it('throws a generic, undescriptive error if the request to the RPC endpoint returns a response that is not 405, 418, 429, 503, or 504', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
id: 12345,
jsonrpc: '2.0',
error: 'some error',
httpStatus: 420,
},
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall }) => makeRpcCall(request),
);
const errorMessage =
providerType === 'infura'
? '{"id":12345,"jsonrpc":"2.0","error":"some error"}'
: "Non-200 status code: '420'";
await expect(promiseForResult).rejects.toThrow(errorMessage);
});
});
[503, 504].forEach((httpStatus) => {
it(`retries the request to the RPC endpoint up to 5 times if it returns a ${httpStatus} response, returning the successful result if there is one on the 5th try`, async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
response: {
error: 'Some error',
httpStatus,
},
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
it(`causes a request to fail with a custom error if the request to the RPC endpoint returns a ${httpStatus} response 5 times in a row`, async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
response: {
error: 'Some error',
httpStatus,
},
times: 5,
});
comms.mockNextBlockTrackerRequest();
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
const err =
providerType === 'infura'
? buildInfuraClientRetriesExhaustedErrorMessage('Gateway timeout')
: buildJsonRpcEngineEmptyResponseErrorMessage(method);
await expect(promiseForResult).rejects.toThrow(err);
});
});
});
it('retries the request to the RPC endpoint up to 5 times if an "ETIMEDOUT" error is thrown while making the request, returning the successful result if there is one on the 5th try', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
error: 'ETIMEDOUT: Some message',
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
// Both the Infura and fetch middleware detect ETIMEDOUT errors and will
// automatically retry the request to the RPC endpoint in question, but both
// produce a different error if the number of retries is exhausted.
if (providerType === 'infura') {
it('causes a request to fail with a custom error if an "ETIMEDOUT" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'ETIMEDOUT: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildInfuraClientRetriesExhaustedErrorMessage(errorMessage),
);
});
});
} else {
it('returns an empty response if an "ETIMEDOUT" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'ETIMEDOUT: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildJsonRpcEngineEmptyResponseErrorMessage(method),
);
});
});
}
// The Infura middleware treats a response that contains an ECONNRESET message
// as an innocuous error that is likely to disappear on a retry. The custom
// RPC middleware, on the other hand, does not specially handle this error.
if (providerType === 'infura') {
it('retries the request to the RPC endpoint up to 5 times if an "ECONNRESET" error is thrown while making the request, returning the successful result if there is one on the 5th try', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
error: 'ECONNRESET: Some message',
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
it('causes a request to fail with a custom error if an "ECONNRESET" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'ECONNRESET: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildInfuraClientRetriesExhaustedErrorMessage(errorMessage),
);
});
});
} else {
it('does not retry the request to the RPC endpoint, but throws immediately, if an "ECONNRESET" error is thrown while making the request', async () => {
const customRpcUrl = 'http://example.com';
await withMockedCommunications(
{ providerType, customRpcUrl },
async (comms) => {
const request = { method };
const errorMessage = 'ECONNRESET: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
});
const promiseForResult = withNetworkClient(
{ providerType, customRpcUrl },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
buildFetchFailedErrorMessage(customRpcUrl, errorMessage),
);
},
);
});
}
// Both the Infura and fetch middleware will attempt to parse the response
// body as JSON, and if this step produces an error, both middleware will also
// attempt to retry the request. However, this error handling code is slightly
// different between the two. As the error in this case is a SyntaxError, the
// Infura middleware will catch it immediately, whereas the custom RPC
// middleware will catch it and re-throw a separate error, which it then
// catches later.
if (providerType === 'infura') {
it('retries the request to the RPC endpoint up to 5 times if an "SyntaxError" error is thrown while making the request, returning the successful result if there is one on the 5th try', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
error: 'SyntaxError: Some message',
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
it('causes a request to fail with a custom error if an "SyntaxError" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'SyntaxError: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildInfuraClientRetriesExhaustedErrorMessage(errorMessage),
);
});
});
it('does not retry the request to the RPC endpoint, but throws immediately, if a "failed to parse response body" error is thrown while making the request', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'failed to parse response body: some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
});
const promiseForResult = withNetworkClient(
{ providerType, infuraNetwork: comms.infuraNetwork },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
buildFetchFailedErrorMessage(comms.rpcUrl, errorMessage),
);
});
});
} else {
it('does not retry the request to the RPC endpoint, but throws immediately, if a "SyntaxError" error is thrown while making the request', async () => {
const customRpcUrl = 'http://example.com';
await withMockedCommunications(
{ providerType, customRpcUrl },
async (comms) => {
const request = { method };
const errorMessage = 'SyntaxError: Some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
});
const promiseForResult = withNetworkClient(
{ providerType, customRpcUrl },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
buildFetchFailedErrorMessage(customRpcUrl, errorMessage),
);
},
);
});
it('retries the request to the RPC endpoint up to 5 times if a "failed to parse response body" error is thrown while making the request, returning the successful result if there is one on the 5th try', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
error: 'failed to parse response body: some message',
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
it('returns an empty response if a "failed to parse response body" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'failed to parse response body: some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildJsonRpcEngineEmptyResponseErrorMessage(method),
);
});
});
}
// Only the custom RPC middleware will detect a "Failed to fetch" error and
// attempt to retry the request to the RPC endpoint; the Infura middleware
// does not.
if (providerType === 'infura') {
it('does not retry the request to the RPC endpoint, but throws immediately, if a "Failed to fetch" error is thrown while making the request', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'Failed to fetch: some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
});
const promiseForResult = withNetworkClient(
{ providerType, infuraNetwork: comms.infuraNetwork },
async ({ makeRpcCall }) => makeRpcCall(request),
);
await expect(promiseForResult).rejects.toThrow(
buildFetchFailedErrorMessage(comms.rpcUrl, errorMessage),
);
});
});
} else {
it('retries the request to the RPC endpoint up to 5 times if a "Failed to fetch" error is thrown while making the request, returning the successful result if there is one on the 5th try', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
// Here we have the request fail for the first 4 tries, then succeed
// on the 5th try.
comms.mockRpcCall({
request,
error: 'Failed to fetch: some message',
times: 4,
});
comms.mockRpcCall({
request,
response: {
result: 'the result',
httpStatus: 200,
},
});
const result = await withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
expect(result).toStrictEqual('the result');
});
});
it('returns an empty response if a "Failed to fetch" error is thrown while making the request to the RPC endpoint 5 times in a row', async () => {
await withMockedCommunications({ providerType }, async (comms) => {
const request = { method };
const errorMessage = 'Failed to fetch: some message';
// The first time a block-cacheable request is made, the latest block
// number is retrieved through the block tracker first. It doesn't
// matter what this is — it's just used as a cache key.
comms.mockNextBlockTrackerRequest();
comms.mockRpcCall({
request,
error: errorMessage,
times: 5,
});
const promiseForResult = withNetworkClient(
{ providerType },
async ({ makeRpcCall, clock }) => {
return await waitForPromiseToBeFulfilledAfterRunningAllTimers(
makeRpcCall(request),
clock,
);
},
);
await expect(promiseForResult).rejects.toThrow(
buildJsonRpcEngineEmptyResponseErrorMessage(method),
);
});
});
}
}