interchain

interchain makes it easy to compose and broadcast Cosmos messages, with all of the proto and amino encoding handled for you.

install

npm install interchain

Table of contents

• interchain
  • Install
  • Table of contents
• Usage
  • RPC Clients
  • Composing Messages
    • Cosmos, CosmWasm, and IBC
      • CosmWasm
      • IBC
      • Cosmos
• Wallets and Signers
  • Stargate Client
  • Creating Signers
  • Broadcasting Messages
• Advanced Usage
• Developing
• Credits

Usage

RPC Clients

import { cosmoshub } from 'interchain';

const { createRPCQueryClient } = cosmoshub.ClientFactory;
const client = await createRPCQueryClient({ rpcEndpoint: RPC_ENDPOINT });

// now you can query the cosmos modules
const balance = await client.cosmos.bank.v1beta1
    .allBalances({ address: 'cosmoshub1addresshere' });

// you can also query the cosmoshub modules
const balances = await client.cosmoshub.exchange.v1beta1
    .exchangeBalances()

Composing Messages

Import the cosmoshub object from interchain.

import { cosmoshub } from 'interchain';

const {
    createSpotLimitOrder,
    createSpotMarketOrder,
    deposit
} = cosmoshub.exchange.v1beta1.MessageComposer.withTypeUrl;

CosmWasm Messages

import { cosmwasm } from "interchain";

const {
    clearAdmin,
    executeContract,
    instantiateContract,
    migrateContract,
    storeCode,
    updateAdmin
} = cosmwasm.wasm.v1.MessageComposer.withTypeUrl;

IBC Messages

import { ibc } from 'interchain';

const {
    transfer
} = ibc.applications.transfer.v1.MessageComposer.withTypeUrl

Cosmos Messages

import { cosmos } from 'interchain';

const {
    fundCommunityPool,
    setWithdrawAddress,
    withdrawDelegatorReward,
    withdrawValidatorCommission
} = cosmos.distribution.v1beta1.MessageComposer.fromPartial;

const {
    multiSend,
    send
} = cosmos.bank.v1beta1.MessageComposer.fromPartial;

const {
    beginRedelegate,
    createValidator,
    delegate,
    editValidator,
    undelegate
} = cosmos.staking.v1beta1.MessageComposer.fromPartial;

const {
    deposit,
    submitProposal,
    vote,
    voteWeighted
} = cosmos.gov.v1beta1.MessageComposer.fromPartial;

Connecting with Wallets and Signing Messages

⚡️ For web interfaces, we recommend using cosmos-kit. Continue below to see how to manually construct signers and clients.

Here are the docs on creating signers in cosmos-kit that can be used with Keplr and other wallets.

Initializing the Stargate Client

Use getSigningcosmoshubClient to get your SigningStargateClient, with the proto/amino messages full-loaded. No need to manually add amino types, just require and initialize the client:

import { getSigningcosmoshubClient } from 'interchain';

const stargateClient = await getSigningcosmoshubClient({
  rpcEndpoint,
  signer // OfflineSigner
});

Creating Signers

To broadcast messages, you can create signers with a variety of options:

• cosmos-kit (recommended)
• keplr
• cosmjs

Amino Signer

Likely you'll want to use the Amino, so unless you need proto, you should use this one:

import { getOfflineSignerAmino as getOfflineSigner } from 'cosmjs-utils';

Proto Signer

import { getOfflineSignerProto as getOfflineSigner } from 'cosmjs-utils';

WARNING: NOT RECOMMENDED TO USE PLAIN-TEXT MNEMONICS. Please take care of your security and use best practices such as AES encryption and/or methods from 12factor applications.

import { chains } from 'chain-registry';

const mnemonic =
  'unfold client turtle either pilot stock floor glow toward bullet car science';
  const chain = chains.find(({ chain_name }) => chain_name === 'cosmoshub');
  const signer = await getOfflineSigner({
    mnemonic,
    chain
  });

Broadcasting Messages

Now that you have your stargateClient, you can broadcast messages:

const { send } = cosmos.bank.v1beta1.MessageComposer.withTypeUrl;

const msg = send({
    amount: [
    {
        denom: 'coin',
        amount: '1000'
    }
    ],
    toAddress: address,
    fromAddress: address
});

const fee: StdFee = {
    amount: [
    {
        denom: 'coin',
        amount: '864'
    }
    ],
    gas: '86364'
};
const response = await stargateClient.signAndBroadcast(address, [msg], fee);

Advanced Usage

If you want to manually construct a stargate client

import { OfflineSigner, GeneratedType, Registry } from "@cosmjs/proto-signing";
import { AminoTypes, SigningStargateClient } from "@cosmjs/stargate";

import {
    cosmosAminoConverters,
    cosmosProtoRegistry,
    cosmwasmAminoConverters,
    cosmwasmProtoRegistry,
    ibcProtoRegistry,
    ibcAminoConverters,
    cosmoshubAminoConverters,
    cosmoshubProtoRegistry
} from 'interchain';

const signer: OfflineSigner = /* create your signer (see above)  */
const rpcEndpint = 'https://rpc.cosmos.directory/cosmoshub'; // or another URL

const protoRegistry: ReadonlyArray<[string, GeneratedType]> = [
    ...cosmosProtoRegistry,
    ...cosmwasmProtoRegistry,
    ...ibcProtoRegistry,
    ...cosmoshubProtoRegistry
];

const aminoConverters = {
    ...cosmosAminoConverters,
    ...cosmwasmAminoConverters,
    ...ibcAminoConverters,
    ...cosmoshubAminoConverters
};

const registry = new Registry(protoRegistry);
const aminoTypes = new AminoTypes(aminoConverters);

const stargateClient = await SigningStargateClient.connectWithSigner(rpcEndpoint, signer, {
    registry,
    aminoTypes
});

Developing

When first cloning the repo:

yarn
yarn build

Codegen

Contract schemas live in ./contracts, and protos in ./proto. Look inside of scripts/codegen.js and configure the settings for bundling your SDK and contracts into interchain:

yarn codegen

Publishing

Build the types and then publish:

yarn build
yarn publish

Related

Checkout these related projects:

• @cosmwasm/ts-codegen for generated CosmWasm contract Typescript classes
• @cosmology/telescope a "babel for the Cosmos", Telescope is a TypeScript Transpiler for Cosmos Protobufs.
• chain-registry an npm module for the official Cosmos chain-registry.
• cosmos-kit A wallet connector for the Cosmos ⚛️
• create-cosmos-app set up a modern Cosmos app by running one command.
• starship a k8s-based unified development environment for Cosmos Ecosystem

Credits

🛠 Built by Cosmology — if you like our tools, please consider delegating to our validator ⚛️

Disclaimer

AS DESCRIBED IN THE LICENSES, THE SOFTWARE IS PROVIDED “AS IS”, AT YOUR OWN RISK, AND WITHOUT WARRANTIES OF ANY KIND.

No developer or entity involved in creating this software will be liable for any claims or damages whatsoever associated with your use, inability to use, or your interaction with other users of the code or software using the code, including any direct, indirect, incidental, special, exemplary, punitive or consequential damages, or loss of profits, cryptocurrencies, tokens, or anything else of value.