πŸ‘Reactions

Learn how to fetch Reactions data using Airstack Hubs API.

Write Reactions

You can create a new reactions on an existing cast to the Hub by using Airstack Hubs API with the code below:

For this, you will first need to create your own signer to call the submit message API.

import {
  hexStringToBytes,
  getSSLHubRpcClient,
  Metadata,
  makeCastAdd,
  FarcasterNetwork,
} from "@farcaster/hub-nodejs";
import {
  ReactionType,
  makeReactionAdd,
} from "@farcaster/core";
import { config } from "dotenv";

config();

const SIGNER_PRIVATE_KEY = '0x...'; // Your signer's private key
const FID = 1; // Your fid
const ed25519Signer = new NobleEd25519Signer(SIGNER_PRIVATE_KEY);
const dataOptions = {
  fid: FID,
  network: FC_NETWORK,
};
const FC_NETWORK = FarcasterNetwork.MAINNET;

const client = getSSLHubRpcClient("hubs-grpc.airstack.xyz");

const castHashHex = "c830f66f4f7beed1516126897b61102ae48c0626"; // Cast to fetch reactions for, remove 0x
const castHashBytes = hexStringToBytes(castHashHex)._unsafeUnwrap(); // Safety: castHashHex is known and can't error

// Construct the reaction
const reactionAdd = await makeReactionAdd(
  {
    type: ReactionType.LIKE,
    targetCastId: {
      fid: 602, // caster FID
      hash: castHashBytes,
    },
  },
  dataOptions,
  ed25519Signer
);

client.$.waitForReady(Date.now() + 5000, async (e) => {
  if (e) {
    console.error(`Failed to connect to the gRPC server:`, e);
    process.exit(1);
  } else {
    console.log(`Connected to the gRPC server`);
    const metadata = new Metadata();
    // Provide API key here
    metadata.add("x-airstack-hubs", process.env.AIRSTACK_API_KEY as string);

    if (reactionAdd.isOk()) {
      // Broadcast the reactions to the Farcaster network
      const submitResult = await client.submitMessage(
        reactionAdd.value,
        metadata
      );
      if (submitResult.isOk()) {
        console.log(`Reply posted successfully`);
      } else {
        console.error(`Error posting reply: ${submitResult.error}`);
      }
    } else {
      const error = reactionAdd.error;
      // Handle the error case
      console.error(`Error posting reply: ${error}`);
    }
    // After everything, close the RPC connection
    client.close();
  }
});

Get Reactions By FID and Target Cast

You can get a reaction by its created FID and target cast by using Airstack Hubs API with the code below:

import {
  Metadata,
  getSSLHubRpcClient,
} from "@farcaster/hub-nodejs";

const client = getSSLHubRpcClient("hubs-grpc.airstack.xyz");

client.$.waitForReady(Date.now() + 5000, async (e) => {
  if (e) {
    console.error(`Failed to connect to the gRPC server:`, e);
    process.exit(1);
  } else {
    console.log(`Connected to the gRPC server`);
    const metadata = new Metadata();
    // Provide API key here
    metadata.add("x-airstack-hubs", process.env.AIRSTACK_API_KEY as string);

    // Fetch reaction data with `getReaction`
    const reactionsResult = await client.getReaction(
      {
        fid: 8150,
        reactionType: ReactionType.LIKE,
        targetCastId: {
          fid: 2,
          hash: castHashBytes,
        },
      },
      metadata,
    );
    
    if (reactionsResult.isOk()) {
      console.log(reactionsResult.value);
    } else {
      console.error("No reactions found: reactionsResult.error);
    }
    // After everything, close the RPC connection
    client.close();
  }
});

Get Reactions By FID

You can get all reactions by a specific FID by using Airstack Hubs API with the code below:

import {
  Metadata,
  getSSLHubRpcClient,
} from "@farcaster/hub-nodejs";

const client = getSSLHubRpcClient("hubs-grpc.airstack.xyz");

client.$.waitForReady(Date.now() + 5000, async (e) => {
  if (e) {
    console.error(`Failed to connect to the gRPC server:`, e);
    process.exit(1);
  } else {
    console.log(`Connected to the gRPC server`);
    const metadata = new Metadata();
    // Provide API key here
    metadata.add("x-airstack-hubs", process.env.AIRSTACK_API_KEY as string);

    // Fetch reactions data with `getReactionsByCast`
    const reactionsResult = await client.getReactionsByCast(
      {
        reactionType: ReactionType.LIKE,
        targetCastId: {
          fid: 2,
          hash: castHashBytes,
        },
      },
      metadata,
    );
    console.log(reactionsResult.value);
    // After everything, close the RPC connection
    client.close();
  }
});

Get Reactions By Cast

You can get all reactions by a specific cast hash by using Airstack Hubs API with the code below:

import {
  Metadata,
  getSSLHubRpcClient,
  ReactionType,
} from "@farcaster/hub-nodejs";

const client = getSSLHubRpcClient("hubs-grpc.airstack.xyz");

client.$.waitForReady(Date.now() + 5000, async (e) => {
  if (e) {
    console.error(`Failed to connect to the gRPC server:`, e);
    process.exit(1);
  } else {
    console.log(`Connected to the gRPC server`);
    const metadata = new Metadata();
    // Provide API key here
    metadata.add("x-airstack-hubs", process.env.AIRSTACK_API_KEY as string);

    // Fetch reaction data with `getReactionsByFid`
    const reactionsResult = await client.getReactionsByFid(
      { fid: 2, reactionType: ReactionType.LIKE },
      metadata,
    );
    console.log(reactionsResult.value);
    // After everything, close the RPC connection
    client.close();
  }
});

Get Reactions By Target Cast URL

You can get all reactions by a specific cast's target URL by using Airstack Hubs API with the code below:

import {
  Metadata,
  getSSLHubRpcClient,
  ReactionType,
} from "@farcaster/hub-nodejs";

const client = getSSLHubRpcClient("hubs-grpc.airstack.xyz");

client.$.waitForReady(Date.now() + 5000, async (e) => {
  if (e) {
    console.error(`Failed to connect to the gRPC server:`, e);
    process.exit(1);
  } else {
    console.log(`Connected to the gRPC server`);
    const metadata = new Metadata();
    // Provide API key here
    metadata.add("x-airstack-hubs", process.env.AIRSTACK_API_KEY as string);

    // Fetch reaction data with `getReactionsByTarget`
    const reactionsRes = await client.getReactionsByTarget(
      {
        targetUrl:
          "chain://eip155:1/erc721:0x39d89b649ffa044383333d297e325d42d31329b2",
        reactionType: ReactionType.LIKE,
      },
      metadata,
    );
    console.log(reactionsRes.value);
    // After everything, close the RPC connection
    client.close();
  }
});

Developer Support

If you have any questions or need help regarding integrating Reactions data using AIrstack Hubs API into your Farcaster app, please join our Airstack's Telegram group.

More Resources

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