Polkadot Cross-Chain Bridge

1export const name = 'Polkadot Cross-Chain Bridge';
2export const version = '0.0.2';
3export const license = 'MIT';
4
5interface Asset {
6  id: string
7  nativeChain: string
8  wrappersByChain: { [chain: string]: { address: string, decimals: number } }
9  stablecoin?: boolean
10  coingeckoId?: string
11}
12
13interface Chain {
14  id: string
15  name: string
16}
17
18const assets: Asset[] = [
19  {
20    id: 'dot',
21    nativeChain: 'polkadot',
22    coingeckoId: 'polkadot',
23    wrappersByChain: {
24      moonbeam: {
25        address: '0xffffffff1fcacbd218edc0eba20fc2308c778080',
26        decimals: 10,
27      },
28      acala: {
29        address: '0x0000000000000000000100000000000000000002',
30        decimals: 10,
31      },
32    },
33  },
34  {
35    id: 'aca',
36    nativeChain: 'acala',
37    coingeckoId: 'acala',
38    wrappersByChain: {
39      moonbeam: {
40        address: '0xffffffffa922fef94566104a6e5a35a4fcddaa9f',
41        decimals: 12,
42      },
43    },
44  },
45  {
46    id: 'ausd',
47    nativeChain: 'acala',
48    stablecoin: true,
49    wrappersByChain: {
50      moonbeam: {
51        address: '0xffffffff52c56a9257bb97f4b2b6f7b2d624ecda',
52        decimals: 12,
53      },
54    },
55  },
56];
57
58const chains: Chain[] = [
59  {
60    id: 'polkadot',
61    name: 'Polkadot Relay Chain',
62  },
63  {
64    id: 'moonbeam',
65    name: 'Moonbeam'
66  },
67  {
68    id: 'acala',
69    name: 'Acala',
70  },
71]
72
73export function setup(sdk: Context) {
74  sdk.ethers.addProvider('moonbeam', 'https://rpc.api.moonbeam.network');
75  sdk.ethers.addProvider('acala', 'https://eth-rpc-acala.aca-api.network');
76
77  const getEVMSupply = (chain: string) => async (addr: string) => {
78    const supply = await sdk.ethers.getERC20Contract(addr, chain).totalSupply();
79    return parseInt(supply.toString());
80  }
81
82  const getSupply: { [chain: string]: (addr: string) => Promise<number> } = {
83    moonbeam: getEVMSupply('moonbeam'),
84    acala: getEVMSupply('acala'),
85  }
86
87  const getBridged = async (chainA: string, chainB: string) => {
88    let total = 0;
89    for (const asset of assets) {
90      if (asset.nativeChain === chainA && asset.wrappersByChain[chainB]) {
91        const [wrapperSupply, price] = await Promise.all([
92          getSupply[chainB](asset.wrappersByChain[chainB].address),
93          asset.stablecoin ? Promise.resolve(1) : sdk.coinGecko.getCurrentPrice(asset.coingeckoId),
94        ]);
95        const wrapperSupplyDecimal = wrapperSupply / (10 ** asset.wrappersByChain[chainB].decimals);
96        const bridgedValue = wrapperSupplyDecimal * price;
97        total += bridgedValue;
98      }
99    }
100    return total;
101  }
102
103  sdk.registerBundle('polkadot', {
104    name: 'Polkadot Cross-Chain Bridge',
105    icon: sdk.ipfs.getDataURILoader('Qmc2A56wLVhqcxeKC3ueje88d9YhEBWgiNXAz32to8yu5g', 'image/svg+xml'),
106    category: 'unknown',
107  });
108
109  for (let i = 0; i < chains.length; i += 1) {
110    for (let j = i + 1; j < chains.length; j += 1) {
111      const chainA = chains[i];
112      const chainB = chains[j];
113
114      sdk.register({
115        id: `polkadot-${chainA.id}-${chainB.id}`,
116        bundle: 'polkadot',
117        queries: {
118          currentValueBridgedAToB: () => getBridged(chainA.id, chainB.id),
119          currentValueBridgedBToA: () => getBridged(chainB.id, chainA.id),
120        },
121        metadata: {
122          name: `Polkadot`,
123          icon: sdk.ipfs.getDataURILoader('Qmc2A56wLVhqcxeKC3ueje88d9YhEBWgiNXAz32to8yu5g', 'image/svg+xml'),
124          subtitle: `${chainA.name}-${chainB.name}`,
125          chainA: chainA.id,
126          chainAName: chainA.name,
127          chainB: chainB.id,
128          chainBName: chainB.name,
129        },
130      })
131    }
132  }
133}
134