76 lines
2.2 KiB
JavaScript
76 lines
2.2 KiB
JavaScript
const { soliditySha3 } = require('web3-utils')
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function strip0x(input) {
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return input.replace(/^0x/, '')
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}
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/**
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* Decodes the datatype byte from the AMB message.
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* First (the most significant bit) denotes if the message should be forwarded to the manual lane.
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* @param dataType: number datatype of the received AMB message.
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* @return {{manualLane: boolean}}
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*/
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const decodeAMBDataType = dataType => ({
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manualLane: (dataType & 128) === 128
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})
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function parseAMBMessage(message) {
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message = strip0x(message)
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const messageId = `0x${message.slice(0, 64)}`
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const sender = `0x${message.slice(64, 104)}`
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const executor = `0x${message.slice(104, 144)}`
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const dataType = parseInt(message.slice(156, 158), 16)
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return {
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sender,
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executor,
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messageId,
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dataType,
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decodedDataType: decodeAMBDataType(dataType)
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}
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}
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const normalizeAMBMessageEvent = e => {
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let msgData = e.returnValues.encodedData
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if (!e.returnValues.messageId) {
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// append tx hash to an old message, where message id was not used
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// for old messages, e.messageId is a corresponding transactionHash
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msgData = e.transactionHash + msgData.slice(2)
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}
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return parseAMBMessage(msgData)
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}
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const ambInformationSignatures = [
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'eth_call(address,bytes)',
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'eth_call(address,bytes,uint256)',
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'eth_call(address,address,uint256,bytes)',
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'eth_blockNumber()',
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'eth_getBlockByNumber()',
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'eth_getBlockByNumber(uint256)',
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'eth_getBlockByHash(bytes32)',
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'eth_getBalance(address)',
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'eth_getBalance(address,uint256)',
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'eth_getTransactionCount(address)',
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'eth_getTransactionCount(address,uint256)',
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'eth_getTransactionByHash(bytes32)',
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'eth_getTransactionReceipt(bytes32)',
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'eth_getStorageAt(address,bytes32)',
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'eth_getStorageAt(address,bytes32,uint256)'
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]
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const ambInformationSelectors = Object.fromEntries(ambInformationSignatures.map(sig => [soliditySha3(sig), sig]))
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const normalizeAMBInfoRequest = e => ({
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messageId: e.returnValues.messageId,
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sender: e.returnValues.sender,
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requestSelector: ambInformationSelectors[e.returnValues.requestSelector] || 'unknown',
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data: e.returnValues.data
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})
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module.exports = {
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strip0x,
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parseAMBMessage,
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normalizeAMBMessageEvent,
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ambInformationSignatures,
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normalizeAMBInfoRequest
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}
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