@xspswap/smart-order-router
Version:
XSwap Protocol V3 Smart Order Router
172 lines • 14.6 kB
JavaScript
import { Pair } from '@x-swap-protocol/v2-sdk';
import _ from 'lodash';
import { ChainId, WRAPPED_NATIVE_CURRENCY } from '../../util/chains';
import { log } from '../../util/log';
import { BIC_XDC, PLI_XDC, PRNT_XDC, SRX_XDC, USDT_XDC, WTK_XDC, WXDC_XDC, XSP_XDC, XTT_XDC, } from '../token-provider';
const BASES_TO_CHECK_TRADES_AGAINST = {
[ChainId.XDC]: [WRAPPED_NATIVE_CURRENCY[ChainId.XDC], USDT_XDC],
[ChainId.XDC_APOTHEM]: [],
};
const ADDITIONAL_BASES = {
[ChainId.XDC]: {
[WXDC_XDC.address]: [
XTT_XDC,
XSP_XDC,
USDT_XDC,
PLI_XDC,
BIC_XDC,
PRNT_XDC,
],
[XTT_XDC.address]: [WXDC_XDC, XSP_XDC],
[XSP_XDC.address]: [WXDC_XDC, XTT_XDC, PLI_XDC],
[USDT_XDC.address]: [WXDC_XDC, BIC_XDC, SRX_XDC],
[BIC_XDC.address]: [WXDC_XDC, USDT_XDC],
[PLI_XDC.address]: [WXDC_XDC],
[WTK_XDC.address]: [WXDC_XDC],
[PRNT_XDC.address]: [WXDC_XDC],
},
[ChainId.XDC_APOTHEM]: {},
};
export const V2_XDC_ADDITIONAL_BASES = ADDITIONAL_BASES[ChainId.XDC];
let paths = [];
const recFinder = (path, used, lastToken, dest, hops) => {
const hop = path.length;
if (hop < hops) {
if (!lastToken) {
return;
}
const additional = V2_XDC_ADDITIONAL_BASES[lastToken.address];
if (additional) {
for (const ad of additional) {
const adToken = ad;
const newPair = [lastToken, adToken];
const newPath = [...path, newPair];
if (adToken.address === dest.address) {
paths.push(newPath);
continue;
}
if (!used[adToken.address]) {
recFinder(newPath, { ...used, [adToken.address]: true }, adToken, dest, hops);
}
}
}
}
};
/**
* Provider that does not get data from an external source and instead returns
* a hardcoded list of Subgraph pools.
*
* Since the pools are hardcoded, the liquidity/price values are dummys and should not
* be depended on.
*
* Useful for instances where other data sources are unavailable. E.g. subgraph not available.
*
* @export
* @class StaticV2SubgraphProvider
*/
export class StaticV2SubgraphProvider {
constructor(chainId) {
this.chainId = chainId;
}
async getPools(tokenIn, tokenOut) {
paths = [];
log.info('In static subgraph provider for V2');
const bases = BASES_TO_CHECK_TRADES_AGAINST[this.chainId];
const basePairs = _.flatMap(bases, (base) => bases.map((otherBase) => [base, otherBase]));
let pairs = [];
if (tokenIn && tokenOut) {
const additionalIn = ADDITIONAL_BASES[this.chainId][tokenIn.address];
const additionalOut = ADDITIONAL_BASES[this.chainId][tokenOut.address];
if (!additionalIn || !additionalOut) {
basePairs.push([tokenIn, tokenOut]);
if (additionalIn) {
basePairs.push(...additionalIn.map((v) => [tokenIn, v]));
}
else {
basePairs.push(...bases.map((base) => [tokenIn, base]));
}
if (additionalOut) {
basePairs.push(...additionalOut.map((v) => [tokenOut, v]));
}
else {
basePairs.push(...bases.map((base) => [tokenOut, base]));
}
pairs = _(basePairs)
.filter((tokens) => Boolean(tokens[0] && tokens[1]))
.filter(([tokenA, tokenB]) => tokenA.address !== tokenB.address && !tokenA.equals(tokenB))
.flatMap(([tokenA, tokenB]) => {
const additionalA = ADDITIONAL_BASES[this.chainId][tokenA.address];
// const additionalB = ADDITIONAL_BASES[this.chainId][tokenB.address];
if (additionalA) {
const additionalPool = additionalA.filter((v) => v.address.toLowerCase() === tokenB.address.toLowerCase());
const res = additionalPool.map((v) => {
return [tokenA, v];
});
return res;
}
return [[tokenA, tokenB]];
})
.value();
}
else {
recFinder([], { [tokenIn.address]: true }, tokenIn, tokenOut, 5);
// console.log(
// paths.map((path) =>
// path
// .map(
// (p) => `(${p[0].symbol} - ${p[1].symbol} : ${p[2] / 10000}% )`
// )
// .join(' --> ')
// )
// );
const uniquePairs = {};
paths.forEach((path) => {
path.forEach((pool) => {
const id = `${pool[0].address}-${pool[1].address}`;
uniquePairs[id] = pool;
});
});
const direct = tokenIn && tokenOut ? [[tokenIn, tokenOut]] : [];
pairs = [...Object.values(uniquePairs), ...direct];
}
}
// pairs = _(basePairs)
// .filter((tokens): tokens is [Token, Token] =>
// Boolean(tokens[0] && tokens[1])
// )
// .filter(
// ([tokenA, tokenB]) =>
// tokenA.address !== tokenB.address && !tokenA.equals(tokenB)
// )
// .value();
const poolAddressSet = new Set();
const subgraphPools = _(pairs)
.map(([tokenA, tokenB]) => {
const poolAddress = Pair.getAddress(tokenA, tokenB);
if (poolAddressSet.has(poolAddress)) {
return undefined;
}
poolAddressSet.add(poolAddress);
const [token0, token1] = tokenA.sortsBefore(tokenB)
? [tokenA, tokenB]
: [tokenB, tokenA];
return {
id: poolAddress,
liquidity: '100',
token0: {
id: token0.address,
},
token1: {
id: token1.address,
},
supply: 100,
reserve: 100,
reserveUSD: 100,
};
})
.compact()
.value();
return subgraphPools;
}
}
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