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[DNM] ChainRpcProvider class with fallback capabilities #509

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The Problem

Issue #410: #410

The Solution

The user should be able to specify in their router's config multiple provider addresses which can be used to fallback to.

For fallback functionality, we are leaning on ethersproject FallbackProvider, but have made a custom extending class ChainProvider which wraps that functionality but also enforces we are using JsonRpcProvider.

Here we've implemented this change with backwards compatability by using comma-separated values. Example for chainProviders in config:

{
  "1337": "http://localhost:8545,http://localhost:8546",
  "1338": "http://localhost:8547"
}

TODO: Link change in docs where we've updated the config API.

@jakekidd jakekidd requested review from rhlsthrm and LayneHaber March 26, 2021 08:02
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This looks great, nice work.

@rhlsthrm
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Pending tests.

@jakekidd jakekidd force-pushed the 410-fallback-provider branch from bdf188a to bc20c0c Compare May 17, 2021 23:15
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Not fully clear on why we need a custom class yet.

@jakekidd jakekidd force-pushed the 410-fallback-provider branch from bd7795e to 927015f Compare May 26, 2021 00:43
@jakekidd jakekidd changed the title Implement chain provider class with fallback capabilities [DNM] ChainRpcProvider class with fallback capabilities May 26, 2021
Object.entries(chainProviders).map(([chainId, url]) => {
hydratedProviders[chainId] = new StaticJsonRpcProvider(url as string, parseInt(chainId));
hydratedProviders[chainId] = new ChainRpcProvider(parseInt(chainId), url);
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Noting that we replaced StaticJsonRpcProvider here - is there something special / different about StaticJsonRpcProvider vs JsonRpcProvider? Do we need to implement additional functionality or a 'Static' version of ChainRpcProvider?

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Hm, we switched to StaticJsonRpcProvider because it cuts down on the number of RPC calls. We should just instantiate as StaticJsonRpcProviders under the hood. Is that possible?

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Yes but lower priority atm

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Do you mean replace JsonRpcProvider with StaticJsonRpcProvider entirely? Or just in this one use case?

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Yes replace entirely. That's what we already did AFAIK.

import { Provider } from "@ethersproject/abstract-provider";
import { BigNumber } from "@ethersproject/bignumber";
import { JsonRpcProvider, StaticJsonRpcProvider } from "@ethersproject/providers";
import { JsonRpcProvider } from "@ethersproject/providers";
import { ChainRpcProvider } from "@connext/vector-types";
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remove duplicate import

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2 participants