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feat(storage): staking support (#286)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| import { EventData } from 'web3-eth-contract' | ||
| import BigNumber from 'bignumber.js' | ||
| import config from 'config' | ||
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| import { loggingFactory } from '../../../logger' | ||
| import { Handler, SupportedTokens } from '../../../definitions' | ||
| import { StorageServices } from '../index' | ||
| import StakeModel from '../models/stake.model' | ||
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| const logger = loggingFactory('storage:handler:stake') | ||
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| /** | ||
| * Make a call to ERC20 token SC and return token symbol | ||
| * Return `rbtc` for ZERO_ADDRESS | ||
| * @param tokenContractAddress | ||
| * @returns {SupportedTokens} token symbol | ||
| */ | ||
| function getTokenSymbol (tokenContractAddress: string): SupportedTokens { | ||
| if (!config.has(`storage.tokens.${tokenContractAddress}`)) { | ||
| throw new Error(`Token at ${tokenContractAddress} not supported`) | ||
| } | ||
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| return config.get<SupportedTokens>(`storage.tokens.${tokenContractAddress}`) | ||
| } | ||
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| /** | ||
| * Find or create stake | ||
| * @param account | ||
| * @param token | ||
| * @returns {Promise<StakeModel>} stake | ||
| */ | ||
| async function findOrCreateStake (account: string, token: string): Promise<StakeModel> { | ||
| const stake = await StakeModel.findOne({ where: { account, token } }) | ||
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| if (stake) { | ||
| return stake | ||
| } | ||
| const symbol = getTokenSymbol(token) | ||
| return StakeModel.create({ account, token, symbol, total: 0 }) | ||
| } | ||
|
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| const handlers = { | ||
| async Staked (event: EventData, { stakeService }: StorageServices): Promise<void> { | ||
| const { user: account, total, token, amount } = event.returnValues | ||
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| const stake = await findOrCreateStake(account, token) | ||
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| stake.total = new BigNumber(stake.total).plus(amount) | ||
| await stake.save() | ||
| logger.info(`Account ${account} stake amount ${amount}, final balance ${total}`) | ||
|
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| if (stakeService.emit) { | ||
| stakeService.emit('updated', stake.toJSON()) | ||
| } | ||
| }, | ||
|
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| async Unstaked (event: EventData, { stakeService }: StorageServices): Promise<void> { | ||
| const { user: account, total, token, amount } = event.returnValues | ||
|
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| const stake = await StakeModel.findOne({ where: { token, account } }) | ||
|
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| if (!stake) { | ||
| throw new Error(`Stake for account ${account}, token ${token} not exist`) | ||
| } | ||
|
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| stake.total = new BigNumber(stake.total).minus(amount) | ||
| await stake.save() | ||
| logger.info(`Account ${account} un-stake amount ${amount}, final balance ${total}`) | ||
|
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| if (stakeService.emit) { | ||
| stakeService.emit('updated', stake.toJSON()) | ||
| } | ||
| } | ||
| } | ||
|
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| function isValidEvent (value: string): value is keyof typeof handlers { | ||
| return value in handlers | ||
| } | ||
|
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| const handler: Handler<StorageServices> = { | ||
| events: ['Staked', 'Unstaked'], | ||
| process (event: EventData, services: StorageServices): Promise<void> { | ||
| if (!isValidEvent(event.event)) { | ||
| return Promise.reject(new Error(`Unknown event ${event.event}`)) | ||
| } | ||
|
|
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| return handlers[event.event](event, services) | ||
| } | ||
| } | ||
|
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| export default handler |
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