chaingraph-ts

Chaingraph-ts

Chaingraph-ts is a TypeScript library that simplifies using Chaingraph by providing type-safe GraphQL interactions and helper functions.

Features

Type-Safe Interactions: Fully typed graphql function through gql-tada for custom GraphQL operations.

Prebuilt Helper Functions: Includes ready-to-use functions for common tasks, such as:

• getRawTransaction: Retrieve raw transaction hex by transaction ID.
• sendRawTransaction: Broadcast a raw transaction to the network.
• getUtxosForAddress: Fetch UTXOs for a given address.

No Setup Required: Start quickly without the need to configure the generated types and the graphQl client configuartion manually.

Details

Chaingraph-ts is built on top of:

• Urql: A lightweight GraphQL client for handling queries and subscriptions.
• gql-tada: Ensures type-safe GraphQL operations using your schema.

By wrapping these tools with Chaingraph's schema, Chaingraph-ts delivers end-to-end type safety and an easy-to-use API, making it the ideal starting point for Chaingraph integrations.

The library is meant as an easy starting point, there's a straight path to moving to Urql with gql-tada directly when users want to do the setup and configuration.

To test GraphQL queries and explore the schema interactively, visit try.chaingraph.cash. This tool provides an easy way to experiment with queries and understand Chaingraph's capabilities.

Install

Install Chaingraph-ts from NPM with:

npm install chaingraph-ts

Example Usage

Here’s an example of how to use Chaingraph-ts to fetch a raw transaction using the helperFunction:

import { ChaingraphClient } from "chaingraph-ts"

// 1. Define your Chaingraph GraphQL URL
const chaingraphUrl = "https://gql.chaingraph.pat.mn/v1/graphql"

// 2. Create a new Chaingraph client
const chaingraphClient = new ChaingraphClient(chaingraphUrl)

// 3. Query a raw transaction by its ID
const transactionId = "4db095f34d632a4daf942142c291f1f2abb5ba2e1ccac919d85bdc2f671fb251"
const rawTransaction = await chaingraphClient.getRawTransaction(transactionId)

// 4. Output the raw transaction hex
console.log(rawTransaction);

Custom Query Example

This example demonstrates how to use a custom query with the graphql function. The query fetches the AuthHead transaction hash of a token from the blockchain, which is useful for managing token metadata authority.

import { ChaingraphClient, graphql } from "chaingraph-ts"

// 1. Define your Chaingraph GraphQL URL
const chaingraphUrl = "https://gql.chaingraph.pat.mn/v1/graphql"

// 2. Create a new Chaingraph client
const chaingraphClient = new ChaingraphClient(chaingraphUrl)

// 3. Write your custom query with 'graphql()'
const queryReqAuthHead = graphql(`query authHeadTransactionId(
  $tokenId: bytea!
){
  transaction(
    where: {
      hash: { _eq: $tokenId }
    }
  ) {
    authchains {
      authhead {
        hash
      }
    }
  }
}`);

// 4. Create the query variables, we prefix with \\x for the 'bytea' type
const tokenId = "8473d94f604de351cdee3030f6c354d36b257861ad8e95bbc0a06fbab2a2f9cf";
const variables = {
  tokenId: `\\x${tokenId}`
}

// 5. Use your custom query through the 'chaingraphClient'
const resultQueryAuthHead = await chaingraphClient.query(queryReqAuthHead, variables)

// 6. Check and output the result
if (!resultQueryAuthHead.data) {
  throw new Error("No data returned from Chaingraph query");
}
const authHeadTxId = resultQueryAuthHead.data.transaction?.[0].authchains?.[0].authhead?.hash
console.log("Auth Head Transaction Hash:", authHeadTxId);

Custom Subscription Example

import { ChaingraphClient, graphql } from "chaingraph-ts";

// 1. Define your Chaingraph GraphQL URL
const chaingraphUrl = "https://gql.chaingraph.pat.mn/v1/graphql";

// 2. Create a new Chaingraph client
const chaingraphClient = new ChaingraphClient(chaingraphUrl);

// 3. Define your subscription query using `graphql()`
const newBlockSubscription = graphql(`subscription MonitorNewBlocks {
  block(order_by: { height: desc }, limit: 1) {
    height
    timestamp
  }
}`);


// 4. Subscribe to new blocks
const newBlockUnsubscribe = chaingraphClient.subscribe(newBlockSubscription, {}).subscribe(async result => {
  if (result.data?.block?.[0]) {
    const { height, timestamp } = result.data.block[0];
    await handleNewBlock(Number(height), timestamp);
  } else if (result.error) {
    console.error("New block subscription error:", result.error);
  }
});

// 5. Handle new block events
let blockHeight = 0
async function handleNewBlock(newBlockHeight: number, timestamp: string) {
  if (newBlockHeight <= blockHeight) return; // Ignore duplicate or older blocks

  console.log(`Processing new block at height ${newBlockHeight}, timestamp: ${timestamp}`);
  blockHeight = newBlockHeight;

  // Add custom logic here (e.g., fetch transactions or notify users)
}

// 6. Unsubscribe when prgram is done (optional)
// newBlockUnsubscribe.unsubscribe();

Build the library

To build the library locally, use:

npm run build

Run the tests

To run the library tests, use:

npm run test