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YPP-0030.md

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Proposal

Replace the Chainlink Oracle in Arbitrum for an L2 specific one.

Background

In Arbitrum, Chainlink recommends to verify the availability of the sequencer before consuming their data feeds. By mistake we deployed the L1 USD Chainlink Oracle that doesn't do so.

Details

  1. Deploy new oracle.
  2. The orchestration and configuration of the new oracle mimics the environment deployment. A new step is included that replaces the spot oracle in the Cauldron for the newly deployed oracle, for the pairs specified.

Deployment scripts can be found here for those with appropriate permissioning.

Configuration:

export const sequencerFlags: string = '0x3C14e07Edd0dC67442FA96f1Ec6999c57E810a83'

export const chainlinkUSDSources: Array<[string, string, string]> = [
  [ETH, assets.get(ETH) as string, '0x639Fe6ab55C921f74e7fac1ee960C0B6293ba612'],
  [DAI, assets.get(DAI) as string, '0xc5C8E77B397E531B8EC06BFb0048328B30E9eCfB'],
  [USDC, assets.get(USDC) as string, '0x50834F3163758fcC1Df9973b6e91f0F0F0434aD3'],
]

// Input data: baseId, ilkId, oracle name, ratio (1000000 == 100%), line, dust, dec
export const assetPairs: Array<[string, string, string]> = [
  [DAI, ETH, protocol.get(CHAINLINKUSD) as string],
  [DAI, DAI, protocol.get(CHAINLINKUSD) as string],
  [DAI, USDC, protocol.get(CHAINLINKUSD) as string],
  [USDC, ETH, protocol.get(CHAINLINKUSD) as string],
  [USDC, DAI, protocol.get(CHAINLINKUSD) as string],
  [USDC, USDC, protocol.get(CHAINLINKUSD) as string],
]

Testing

The change has been tested on a mainnet fork:

+ npx hardhat run --network localhost ./scripts/governance/replaceChainlinkL2USDOracle/setupOracles.ts
No need to generate any newer typings.
chainlinkUSDOracle.grantRoles(gov, timelock)
chainlinkUSDOracle.grantRole(ROOT, cloak)
chainlinkUSDOracle.revokeRole(ROOT, deployer)
Setting up 0x639Fe6ab55C921f74e7fac1ee960C0B6293ba612 as the source for 0x303000000000/USD at 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Aggregator decimals: 8
Setting up 0xc5C8E77B397E531B8EC06BFb0048328B30E9eCfB as the source for 0x303100000000/USD at 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Aggregator decimals: 8
Setting up 0x50834F3163758fcC1Df9973b6e91f0F0F0434aD3 as the source for 0x303200000000/USD at 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Aggregator decimals: 8
Spot oracle for 0x303100000000/0x303000000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Spot oracle for 0x303100000000/0x303100000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Spot oracle for 0x303100000000/0x303200000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Spot oracle for 0x303200000000/0x303000000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Spot oracle for 0x303200000000/0x303100000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Spot oracle for 0x303200000000/0x303200000000 set to 0x8E9696345632796e7D80fB341fF4a2A60aa39C89
Proposal: 0xde5f416d09cc8c6ccb4138eeeb9b6a05d992c4a16ad8f367b41c3479884ba918
Executing
Executed 0xde5f416d09cc8c6ccb4138eeeb9b6a05d992c4a16ad8f367b41c3479884ba918