@xspswap/smart-order-router
Version:
XSwap Protocol V3 Smart Order Router
107 lines • 10.4 kB
JavaScript
import { ChainId, WETH9 } from '@x-swap-protocol/sdk-core';
import _ from 'lodash';
import { log } from '../util';
import { DAI_XDC_APOTHEM, USDC_XDC, USDC_XDC_APOTHEM, USDT_XDC_APOTHEM, } from './token-provider';
// These tokens will added to the Token cache on initialization.
export const CACHE_SEED_TOKENS = {
[ChainId.APOTHEM]: {
USDC: USDC_XDC_APOTHEM,
USDT: USDT_XDC_APOTHEM,
DAI: DAI_XDC_APOTHEM,
WXDC: WETH9[ChainId.APOTHEM],
},
[ChainId.XDC]: {
USDC: USDC_XDC,
WXDC: WETH9[ChainId.XDC],
},
// Currently we do not have providers for Moonbeam mainnet or Gnosis testnet
};
/**
* Provider for getting token metadata that falls back to a different provider
* in the event of failure.
*
* @export
* @class CachingTokenProviderWithFallback
*/
export class CachingTokenProviderWithFallback {
constructor(chainId,
// Token metadata (e.g. symbol and decimals) don't change so can be cached indefinitely.
// Constructing a new token object is slow as sdk-core does checksumming.
tokenCache, primaryTokenProvider, fallbackTokenProvider) {
this.chainId = chainId;
this.tokenCache = tokenCache;
this.primaryTokenProvider = primaryTokenProvider;
this.fallbackTokenProvider = fallbackTokenProvider;
this.CACHE_KEY = (chainId, address) => `token-${chainId}-${address}`;
}
async getTokens(_addresses) {
const seedTokens = CACHE_SEED_TOKENS[this.chainId];
if (seedTokens) {
for (const token of Object.values(seedTokens)) {
await this.tokenCache.set(this.CACHE_KEY(this.chainId, token.address.toLowerCase()), token);
}
}
const addressToToken = {};
const symbolToToken = {};
const addresses = _(_addresses)
.map((address) => address.toLowerCase())
.uniq()
.value();
const addressesToFindInPrimary = [];
const addressesToFindInSecondary = [];
for (const address of addresses) {
if (await this.tokenCache.has(this.CACHE_KEY(this.chainId, address))) {
addressToToken[address.toLowerCase()] = (await this.tokenCache.get(this.CACHE_KEY(this.chainId, address)));
symbolToToken[addressToToken[address].symbol] =
(await this.tokenCache.get(this.CACHE_KEY(this.chainId, address)));
}
else {
addressesToFindInPrimary.push(address);
}
}
log.info({ addressesToFindInPrimary }, `Found ${addresses.length - addressesToFindInPrimary.length} out of ${addresses.length} tokens in local cache. ${addressesToFindInPrimary.length > 0
? `Checking primary token provider for ${addressesToFindInPrimary.length} tokens`
: ``}
`);
if (addressesToFindInPrimary.length > 0) {
const primaryTokenAccessor = await this.primaryTokenProvider.getTokens(addressesToFindInPrimary);
for (const address of addressesToFindInPrimary) {
const token = primaryTokenAccessor.getTokenByAddress(address);
if (token) {
addressToToken[address.toLowerCase()] = token;
symbolToToken[addressToToken[address].symbol] = token;
await this.tokenCache.set(this.CACHE_KEY(this.chainId, address.toLowerCase()), addressToToken[address]);
}
else {
addressesToFindInSecondary.push(address);
}
}
log.info({ addressesToFindInSecondary }, `Found ${addressesToFindInPrimary.length - addressesToFindInSecondary.length} tokens in primary. ${this.fallbackTokenProvider
? `Checking secondary token provider for ${addressesToFindInSecondary.length} tokens`
: `No fallback token provider specified. About to return.`}`);
}
if (this.fallbackTokenProvider && addressesToFindInSecondary.length > 0) {
const secondaryTokenAccessor = await this.fallbackTokenProvider.getTokens(addressesToFindInSecondary);
for (const address of addressesToFindInSecondary) {
const token = secondaryTokenAccessor.getTokenByAddress(address);
if (token) {
addressToToken[address.toLowerCase()] = token;
symbolToToken[addressToToken[address].symbol] = token;
await this.tokenCache.set(this.CACHE_KEY(this.chainId, address.toLowerCase()), addressToToken[address]);
}
}
}
return {
getTokenByAddress: (address) => {
return addressToToken[address.toLowerCase()];
},
getTokenBySymbol: (symbol) => {
return symbolToToken[symbol.toLowerCase()];
},
getAllTokens: () => {
return Object.values(addressToToken);
},
};
}
}
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xFQUFxQixFQUFFO2dCQUN4RCxPQUFPLGNBQWMsQ0FBQyxPQUFPLENBQUMsV0FBVyxFQUFFLENBQUMsQ0FBQztZQUMvQyxDQUFDO1lBQ0QsZ0JBQWdCLEVBQUUsQ0FBQyxNQUFjLEVBQXFCLEVBQUU7Z0JBQ3RELE9BQU8sYUFBYSxDQUFDLE1BQU0sQ0FBQyxXQUFXLEVBQUUsQ0FBQyxDQUFDO1lBQzdDLENBQUM7WUFDRCxZQUFZLEVBQUUsR0FBWSxFQUFFO2dCQUMxQixPQUFPLE1BQU0sQ0FBQyxNQUFNLENBQUMsY0FBYyxDQUFDLENBQUM7WUFDdkMsQ0FBQztTQUNGLENBQUM7SUFDSixDQUFDO0NBQ0YifQ==