Any methods in the Ethereum JSON-RPC spec are now included in our
network client tests. These tests were skipped previously because they
are not supported by Infura.
Closes#16938
* Add tests for `retryOnEmpty` middleware
Tests have been added for the `retryOnEmpty` middleware.
This middleware is only used on the Infura network client, so the tests
that demonstrate this retry behavior are only enabled for the `infura`
provider type.
Most of the tests added were to cover cases where the retry middleware
is skipped, so they were applicable for both provider types.
Closes#17004
* Improve readability of block number tests
The test cases for passing a block number parameter have been made more
readable. Specifically, a comment has been added each time params are
built to call attention to the block parameter and what value it has,
so that it's clear whether it's larger or smaller than the current
block number.
Additionally the blocks for "less than the current block number" and
"equal to the current block number" have been combined using
`describe.each`.
Tests have been added to ensure that our middleware will not return a
cached response to a request with unique parameters. Each parameter
supported by each method is tested independently.
Closes#17003
Previously we had written tests for `createInfuraClient`, which creates a middleware stack designed to connect to an Infura provider. These tests exercise various RPC methods that relate to the behavior that the middleware provides (mainly around caching).
Now we need to write the same tests but for `createJsonRpcClient`, which creates a middleware stack designed to connect to a non-Infura RPC endpoint. To do this, we had to:
- Consolidate the tests for both types of RPC client into a single test file.
- Add conditions around tests or assertions in tests to account for differences in behavior between the two sets of middleware stacks.
- Relocate code in `createJsonRpcClient` which slows down `eth_estimateGas` calls just for tests so that this behavior can be disabled in the network client tests.
Eventually, as we unify the network controllers in this repo and in the core repo, we will move these tests into the core repo.
Co-authored-by: Elliot Winkler <elliot.winkler@gmail.com>
This commit affects the network client tests, which were added in a
previous PR to test the behavior of `createInfuraClient`, a function
called that sets up a portion of the middleware stack in the JSON-RPC
layer.
An `if` statement appears in the tests which limits the execution of
certain tests. However, this seems to have been added for debugging
purposes and is not actually needed.
Co-authored-by: Brad Decker <bhdecker84@gmail.com>
* Fix shared mocks in RPC network client test
Some of the provider api unit tests were inadvertently sharing test
mocks. A `params` object used for mock RPC calls was being shared
between tests and between calls within individual tests. They have been
updated to generate a fresh `params` object for each mock RPC call.
* Explicitly set blockParam to undefined
This update includes fixes for our `block-ref` and `retry-on-empty`
middleware.
The `block-ref` middleware resolves the block reference `latest` to a
specific block number, the latest one we are aware of. This is meant to
protect against situations where the network gives inconsistent answers
for what the latest block number is due to some nodes being out-of-sync
with each other (this was a frequent problem years ago with Infura).
It was broken in that the `latest` resolution was failing, and we were
submitting an additional redundant request to Infura for each request.
The `retry-on-empty` middleware is meant to retry certain methods
when they return an empty response. This was also meant to deal with
network synchronization issues that were more common years ago. This
middleware works by making a "child" request over and over until either
a retry limit is reached, or a non-empty response is received.
It was broken in that the final response recieved was thrown away, so
it's as though the middleware was not used. Except that it did result
in additional redundant network requests.
As a result of this update we should see that the extension is more
resilient to certain network synchronization issues. But this is
difficult to test, and these issues may not happen in production
anymore today.
We should see a reduction in requests to Infura as well. This should
be easier to test.
Add tests for the `block-tracker-inspector` middleware — which makes
sure that the block tracker never has a reference to the latest block
which is less than a block number that shows up in an RPC method's
response — and the Infura middleware — which takes care of sending the
request to Infura, and will retry the request up to 5 times if Infura
sends back a certain type of error.
Note that the `retry-on-empty` middleware is not tested because it
currently has a [bug][1] which is making it ineffective.
[1]: https://github.com/MetaMask/eth-json-rpc-middleware/issues/139
We are working on migrating the extension to a unified network
controller, but before we do so we want to extract some of the existing
pieces, specifically `createInfuraClient` and `createJsonRpcClient`,
which provide the majority of the behavior exhibited within the provider
API that the existing NetworkController exposes. This necessitates that
we understand and test that behavior as a whole.
With that in mind, this commit starts with the Infura-specific network
client and adds some initial functional tests for `createInfuraClient`,
specifically covering three pieces of middleware provided by
`eth-json-rpc-middleware`: `createNetworkAndChainIdMiddleware`,
`createBlockCacheMiddleware`, and `createBlockRefMiddleware`.
These tests exercise logic that originate from multiple different places
and combine in sometimes surprising ways, and as a result, understanding
the nature of the tests can be tricky. I've tried to explain the logic
(both of the implementation and the tests) via comments. Additionally,
debugging why a certain test is failing is not the most fun thing in the
world, so to aid with this, I've added some logging to the underlying
packages used when a request passes through the middleware stack.
Because some middleware change the request being made, or make new
requests altogether, this greatly helps to peel back the curtain, as
failures from Nock do not supply much meaningful information on their
own. This logging is disabled by default, but can be activated by
setting `DEBUG=metamask:*,eth-query DEBUG_COLORS=1` alongside the `jest`
command.
We use this logging by bumping `eth-block-tracker`, and
`eth-json-rpc-middleware`.
