Add interactions involving filters & subscriptions #202
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We have a PR in the extension repo which touches code around RPC
middleware for filter- and subscription-based RPC methods, and we want
to be able to test these methods manually to ensure they are still
working as designed. In order to accomplish this, I've added new cards
which allow the user to:
* Create and remove a filter.
* Currently there is support for creating a generic log filter via
`eth_newFilter` as well as a block filter via `eth_newBlockFilter`.
Once a filter is created, `eth_getFilterChanges` is then polled
every 2 seconds. Filters are removed via `eth_uninstallFilter`.
* I tried to add a button which created a pending transaction filter
via `eth_newPendingTransactionFilter`, but it appears that
`eth-json-rpc-filters` has a
[bug](MetaMask/eth-json-rpc-filters#81)
which prohibits this RPC method from working fully.
* Start and stop a subscription.
* As with filters, currently there is support for subscribing to new
blocks via the `newHeads` parameter to `eth_subscribe` as well as
new logs via the `logs` parameter. Subscriptions are stopped via
`eth_unsubscribe`.
* I also tried to add a button for subscribing to pending
transactions, but [this doesn't seem to be supported outright by
`eth-json-rpc-filters`](https://github.com/MetaMask/eth-json-rpc-filters/blob/5cbea3037b0655aa2c188d85b8ffe559a263dc0d/subscriptionManager.js#L50).
legobeat
reviewed
Dec 16, 2022
Comment on lines
+34
to
+37
| if (!['log', 'block', 'pendingTransaction'].includes(filterType)) { | ||
| throw new Error( | ||
| "filterType must be either 'log', 'block', or 'pendingTransaction'", | ||
| ); |
Contributor
There was a problem hiding this comment.
Mostly to get rid of double-quotes ;)
Suggested change
| if (!['log', 'block', 'pendingTransaction'].includes(filterType)) { | |
| throw new Error( | |
| "filterType must be either 'log', 'block', or 'pendingTransaction'", | |
| ); | |
| const validFilterTypes = ['log', 'block', 'pendingTransaction']; | |
| if (!validFilterTypes.includes(filterType)) { | |
| throw new Error( | |
| `filterType must be one of: ${validFilterTypes.join(',')}.`, | |
| ); |
Gudahtt
reviewed
Dec 16, 2022
|
|
||
| newSubscriptionId = await ethereum.request({ | ||
| method: 'eth_subscribe', | ||
| params: [subscriptionType], |
Member
There was a problem hiding this comment.
For the logs subscription type, this ends up being very noisy. Perhaps we could add a "topic" filter to reduce the volume?
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We have a PR in the extension repo which touches code around RPC middleware for filter- and subscription-based RPC methods, and we want to be able to test these methods manually to ensure they are still working as designed. In order to accomplish this, I've added new cards which allow the user to:
eth_newFilteras well as a block filter viaeth_newBlockFilter. Once a filter is created,eth_getFilterChangesis then polled every 2 seconds. Filters are removed viaeth_uninstallFilter.eth_newPendingTransactionFilter, but it appears thateth-json-rpc-filtershas a bug which prohibits this RPC method from working fully.newHeadsparameter toeth_subscribeas well as new logs via thelogsparameter. Subscriptions are stopped viaeth_unsubscribe.eth-json-rpc-filters.Screencaps
Screen.Recording.2022-12-15.at.5.24.28.PM.mov