loading currencies from assethub

src/config.js

@@ -2,6 +2,7 @@ import * as dotenv from 'dotenv';
 dotenv.config();
 
 export const rpc = process.env.RPC_URL || 'wss://localhost:9988';
+export const ahRpc = process.env.AH_RPC_URL || 'wss://polkadot-asset-hub-rpc.polkadot.io';
 export const token = process.env.DISCORD_TOKEN;
 export const channel = process.env.DISCORD_CHANNEL;
 export const sha = process.env.COMMIT_SHA || 'dev';

src/currencies.js

@@ -3,101 +3,9 @@ import dijkstrajs from "dijkstrajs";
 import {usdCurrencyId, whaleAmount} from "./config.js";
 import {fromAccount} from "./utils/evm.js";
 import {emojify} from "./utils/emojify.js";
+import {metadata} from "./utils/assethub.js";
 
-let currencies = {
-  '1000019': {
-    name: 'DED',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'DED',
-    decimals: '10'
-  },
-  '1000021': {
-    name: 'PINK',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'PINK',
-    decimals: '10'
-  },
-  '1000023': {
-    name: 'IceCreamToken',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'ICE',
-    decimals: '20'
-  },
-  '1000026': {
-    name: 'Efinity Token',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'EFI',
-    decimals: '18'
-  },
-  '1000027': {
-    name: 'web3.online',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'web3',
-    decimals: '18'
-  },
-  '1000028': {
-    name: 'Polkadot Index',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'PINT',
-    decimals: '12'
-  },
-  '1000029': {
-    name: 'Danger Coin',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'DANGER',
-    decimals: '8'
-  },
-  '1000034': {
-    name: 'STINK',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'STINK',
-    decimals: '10'
-  },
-  '1000035': {
-    name: 'BEER',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'BEER',
-    decimals: '6'
-  },
-  '1000036': {
-    name: 'BEEFY',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'BEEFY',
-    decimals: '2'
-  },
-  '1000038': {
-    name: 'DOTA',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'DOTA',
-    decimals: '4'
-  },
-  '1000085': {
-    name: 'WUD',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'WUD',
-    decimals: '10'
-  },
-  '1000091': {
-    name: 'BDNT',
-    assetType: 'External',
-    existentialDeposit: '1',
-    symbol: 'BDNT',
-    decimals: '10'
-  }
-};
-
+let currencies = {};
 const prices = {};
 
 export const isWhale = amount => amount >= whaleAmount;
@@ -121,6 +29,14 @@ async function loadCurrency(id) {
       const [parent, maturity] = bond.toHuman();
       currency = {...currency, parent, maturity};
     }
+    if (currency.assetType === 'External') {
+      const location = (await api().query.assetRegistry.assetLocations(id)).toJSON();
+      const ahId = location?.interior?.x3[2]?.generalIndex;
+      if (ahId) {
+        const meta = await metadata(ahId);
+        currency = {...currency, ...meta?.toHuman()};
+      }
+    }
     currencies = {...currencies, [id]: currency};
   }
 }

src/utils/assethub.js

@@ -0,0 +1,16 @@
+import {ApiPromise, WsProvider} from "@polkadot/api";
+import {ahRpc} from "../config.js";
+
+let _api;
+
+async function api() {
+  if (!_api && ahRpc) {
+    const provider = new WsProvider(ahRpc);
+    _api = await ApiPromise.create({provider});
+  }
+  return _api;
+}
+
+export async function metadata(id) {
+  return (await api())?.query.assets.metadata(id);
+}