CW20 stargate cosmos

gistfile1.txt

import axios from  "axios"
import { SigningCosmWasmClient } from "@cosmjs/cosmwasm-stargate";


// TODO: Extract to separate folder: interfaces and funcs
interface Balances {
  readonly address: string
  readonly amount: string  // decimal as string
}

interface MintInfo {
  readonly minter: string
  readonly cap?: string // decimal as string
}

type Expiration = {readonly at_height: number} | {readonly at_time: number} | {readonly never: {}};

interface AllowanceResponse {
  readonly allowance: string;  // integer as string
  readonly expires: Expiration;
}

interface AllowanceInfo {
  readonly allowance: string;  // integer as string
  readonly spender: string; // bech32 address
  readonly expires: Expiration;
}

interface AllAllowancesResponse {
  readonly allowances: readonly AllowanceInfo[];
}

interface AllAccountsResponse {
  // list of bech32 address that have a balance
  readonly accounts: readonly string[];
}


interface CW20Instance {
  readonly contractAddress: string

  // queries
  balance: (address?: string) => Promise<string>
  allowance: (owner: string, spender: string) => Promise<AllowanceResponse>
  allAllowances: (owner: string, startAfter?: string, limit?: number) => Promise<AllAllowancesResponse>
  allAccounts: (startAfter?: string, limit?: number) => Promise<readonly string[]>
  tokenInfo: () => Promise<any>
  minter: () => Promise<any>

  // actions
  mint: (txSigner: string, recipient: string, amount: string) => Promise<string>
  transfer: (txSigner: string, recipient: string, amount: string) => Promise<string>
  burn: (txSigner: string, amount: string) => Promise<string>
  increaseAllowance: (txSigner: string, recipient: string, amount: string) => Promise<string>
  decreaseAllowance: (txSigner: string, recipient: string, amount: string) => Promise<string>
  transferFrom: (txSigner: string, owner: string, recipient: string, amount: string) => Promise<string>
}

interface CW20Contract {
  // upload a code blob and returns a codeId
  upload: (txSigner: string) => Promise<number>

  // instantiates a cw20 contract
  // codeId must come from a previous deploy
  // label is the public name of the contract in listing
  // if you set admin, you can run migrations on this contract (likely client.senderAddress)
  instantiate: (txSigner: string, codeId: number, initMsg: Record<string, unknown>, label: string, admin?: string) => Promise<CW20Instance>

  use: (contractAddress: string) => CW20Instance
}


export const CW20 = (client: SigningCosmWasmClient): CW20Contract => {
  const use = (contractAddress: string): CW20Instance => {
    const balance = async (account: string): Promise<string> => {
      const result = await client.queryContractSmart(contractAddress, {balance: { account }});
      return result.balance;
    };

    const allowance = async (owner: string, spender: string): Promise<AllowanceResponse> => {
      return client.queryContractSmart(contractAddress, {allowance: { owner, spender }});
    };

    const allAllowances = async (owner: string, startAfter?: string, limit?: number): Promise<AllAllowancesResponse> => {
      return client.queryContractSmart(contractAddress, {all_allowances: { owner, start_after: startAfter, limit }});
    };

    const allAccounts = async (startAfter?: string, limit?: number): Promise<readonly string[]> => {
      const accounts: AllAccountsResponse = await client.queryContractSmart(contractAddress, {all_accounts: { start_after: startAfter, limit }});
      return accounts.accounts;
    };

    const tokenInfo = async (): Promise<any> => {
      return client.queryContractSmart(contractAddress, {token_info: { }});
    };

    const minter = async (): Promise<any> => {
      return client.queryContractSmart(contractAddress, {minter: { }});
    };

    // mints tokens, returns transactionHash
    const mint = async (senderAddress: string, recipient: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {mint: {recipient, amount}});
      return result.transactionHash;
    }

    // transfers tokens, returns transactionHash
    const transfer = async (senderAddress: string, recipient: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {transfer: {recipient, amount}});
      return result.transactionHash;
    }

    // burns tokens, returns transactionHash
    const burn = async (senderAddress: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {burn: {amount}});
      return result.transactionHash;
    }

    const increaseAllowance = async (senderAddress: string, spender: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {increase_allowance: {spender, amount}});
      return result.transactionHash;
    }

    const decreaseAllowance = async (senderAddress: string, spender: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {decrease_allowance: {spender, amount}});
      return result.transactionHash;
    }

    const transferFrom = async (senderAddress: string, owner: string, recipient: string, amount: string): Promise<string> => {
      const result = await client.execute(senderAddress, contractAddress, {transfer_from: {owner, recipient, amount}});
      return result.transactionHash;
    }

    return {
      contractAddress,
      balance,
      allowance,
      allAllowances,
      allAccounts,
      tokenInfo,
      minter,
      mint,
      transfer,
      burn,
      increaseAllowance,
      decreaseAllowance,
      transferFrom,
    };
  }

  const downloadWasm = async (url: string): Promise<Uint8Array> => {
    const r = await axios.get(url, { responseType: 'arraybuffer' })
    if (r.status !== 200) {
      throw new Error(`Download error: ${r.status}`)
    }
    return r.data
  }

  const upload = async (senderAddress: string): Promise<number> => {
    const meta = {
      source: "https://github.com/CosmWasm/cosmwasm-plus/tree/v0.6.2/contracts/cw20-base",
      builder: "cosmwasm/workspace-optimizer:0.10.7"
    };
    const sourceUrl = "https://github.com/CosmWasm/cosmwasm-plus/releases/download/v0.6.2/cw20_base.wasm";
    const wasm = await downloadWasm(sourceUrl);
    const result = await client.upload(senderAddress, wasm, meta);
    return result.codeId;
  }

  const instantiate = async (senderAddress: string, codeId: number, initMsg: Record<string, unknown>, label: string, admin?: string): Promise<CW20Instance> => {
    const result = await client.instantiate(senderAddress, codeId, initMsg, label, { memo: `Init ${label}`, admin});
    return use(result.contractAddress);
  }

  return { upload, instantiate, use };
}