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101 lines (91 loc) · 3.44 KB
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/**
* Mine-side implementation to interact with the Sonar smart contract from a miners perspective
*/
const fs = require('fs')
const assert = require('assert')
class Sonar {
constructor (web3, contractAddress, mineAddress, options = {}) {
const isValidAddress = a => a.slice(0, 2).toLowerCase() === '0x' && a.length === 42
assert(typeof web3 === 'object', 'Pass a valid web3 instance')
assert(typeof contractAddress === 'string' && isValidAddress(contractAddress), 'contractAddress should be a hexstring')
assert(typeof mineAddress === 'string' && isValidAddress(mineAddress), 'mineAddress should be a hexstring')
options.host = options.host || config.ethereum.host
options.port = options.port || config.ethereum.port
const abi = JSON.parse(fs.readFileSync('./node_modules/@openmined/sonar/build/ModelRepository.abi', 'utf8'))
const contract = new web3.eth.Contract(abi, contractAddress)
this.web3 = web3
this.contract = contract
this.mineAddress = mineAddress
this.contractAddress = contractAddress
return this
}
_call (method, ...args) {
return this.contract.methods[method](...args).call({from: this.mineAddress})
}
/**
* Convert an Array of hexStrings to Base58 address.
* @param {Array} hexStrings
*/
arrayToAddress (hexStrings) {
return hexStrings.map(e => Buffer.from(e.slice(2), 'hex').toString().split('\x00')[0])
.join('')
}
/**
* Convert Base58 address to an Array that fits into Sonar contract.
* @param {String} ipfsAddress
*/
addressToArray (ipfsAddress) {
const targetLength = 64 // fill the address with 0 at the end to this length
const parts = ipfsAddress.match(/.{1,32}/g) // split into 32-chars
.map(part => part.split('').map(c => c.charCodeAt(0).toString(16)).join('')) // turn each part into a hexString address
.map(part => part.concat('0'.repeat(targetLength - part.length))) // 0 pad at the end
.map(part => '0x' + part) // prefix as hex
return parts
}
/**
* Return the number of available models on the contract.
*/
getNumModels () {
return this._call('getNumModels')
}
/**
* Get details about a model via its id.
* @param {number} id
*/
async getModel (id) {
const data = await this._call('getModel', id)
const gradients = await this._call('getNumGradientsforModel', id)
return {
id,
ownerAddress: data[0],
bounty: data[1], // in Wei,
initialError: data[2],
targetError: data[3],
weightsAddress: this.arrayToAddress(data[4]),
gradientCount: gradients
}
}
async getModelGradients (modelId, gradientId = -1) {
// use latest gradients if none is specified
if (gradientId < 0) {
const m = await this.getModel(modelId)
gradientId = m.gradientCount - 1
}
let gradients = await this._call('getGradient', modelId, gradientId)
gradients = Object.values(gradients) // convert pseudo-array to array
const [, from, gradientsAddress, newError, weightsAddress] = gradients
return {
id: gradientId,
minerAddress: from,
gradientsAddress: this.arrayToAddress(gradientsAddress),
newError,
weightsAddress: this.arrayToAddress(weightsAddress)
}
}
async addGradient (modelId, gradientsAddress) {
return this.contract.methods.addGradient(modelId, this.addressToArray(gradientsAddress)).send({from: this.mineAddress, to: this.contractAddress, gas: 500000})
}
destroy () {
}
}
module.exports = Sonar