Fusion SDK

Fusion SDK provides TypeScript/JavaScript wrappers and types for interacting with Notifi Fusion blockchain services, including EVM, Sui, Solana, storage management, and subscriptions.

Installation

npm install fusion-sdk

Usage

import {
  EvmRpc,
  SuiRpc,
  SolanaRpc,
  PersistentStorage,
  EphemeralStorage,
  Subscriptions,
  BlockchainType,
  HttpMethod,
  Region,
  getParserBlobInput
} from "fusion-sdk";

const evm = new EvmRpc("your-context-id");
const sui = new SuiRpc("your-context-id");
const solana = new SolanaRpc("your-context-id");
const persistentStorage = new PersistentStorage("your-context-id");
const ephemeralStorage = new EphemeralStorage("your-context-id");
const subscriptions = new Subscriptions("your-context-id");

API Reference

Classes

EvmRpc

EVM-specific blockchain operations.

Methods:

• runEthCall(request): Executes an Ethereum call operation.
• getAccountBalance(request): Retrieves the account balance for an Ethereum address.

const evm = new EvmRpc("your-context-id");
const balance = await evm.getAccountBalance({ address: "0x..." });

SuiRpc

Sui blockchain operations.

Methods:

• getSuiAccountBalance(request): Retrieves the account balance for a Sui address.
• runSuiTransaction(request): Executes a Sui transaction.
• getSuiObject(request): Retrieves a Sui object.

const sui = new SuiRpc("your-context-id");
const balance = await sui.getSuiAccountBalance({ address: "0x..." });

SolanaRpc

Solana blockchain operations.

Methods:

• getSolanaBalance(request): Retrieves the balance for a Solana address.
• getSolanaAccountInfo(request): Retrieves account information for a Solana address.
• getSolanaSlot(request): Retrieves the current Solana slot.

const solana = new SolanaRpc("your-context-id");
const balance = await solana.getSolanaBalance({ address: "..." });

PersistentStorage

CRUD operations for persistent storage.

Methods:

• put(request): Stores a string value in persistent storage.
• get(request): Retrieves a value from persistent storage.
• delete(request): Deletes a value from persistent storage.

const persistentStorage = new PersistentStorage("your-context-id");
await persistentStorage.put({ key: "foo", value: "bar" });
const value = await persistentStorage.get({ key: "foo" });

Optimistic Concurrency Example: Fetch a value, increment its version, update, and retry on exception (optimistic locking with 100ms jitter):

function sleep(ms: number) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function updateWithOptimisticLock(key: string, newValue: string, maxRetries = 3) {
  let attempt = 0;
  while (attempt < maxRetries) {
    try {
      // Fetch current value and version
      const current = await persistentStorage.get({ key });
      const currentVersion = current.version ?? 0;
      // Attempt to update with incremented version
      await persistentStorage.put({ key, value: newValue, version: currentVersion + 1 });
      return true;
    } catch (err) {
      attempt++;
      if (attempt >= maxRetries) throw err;
      // Add 100ms jitter before retrying
      await sleep(100 + Math.floor(Math.random() * 100));
    }
  }
  return false;
}

// Usage
await updateWithOptimisticLock("foo", "newBar");

This pattern helps ensure updates are atomic and consistent, retrying if another process updates the value concurrently.

EphemeralStorage

Operations for ephemeral storage.

Methods:

• put(request): Stores a string value in ephemeral storage.
• get(request): Retrieves a value from ephemeral storage.
• delete(request): Deletes a value from ephemeral storage.
• peek(request): Peeks at the next value in a queue in ephemeral storage.
• enqueue(request): Enqueues a value into a queue in ephemeral storage.
• dequeue(request): Dequeues a value from a queue in ephemeral storage.
• getModuleExecutionParams(request): Retrieves module execution parameters.
• getOnChainBlock(request): Retrieves an on-chain block.

const ephemeralStorage = new EphemeralStorage("your-context-id");
await ephemeralStorage.put({ key: "temp", value: "baz" });
const value = await ephemeralStorage.get({ key: "temp" });

Subscriptions

Manage and retrieve subscription data.

Methods:

• getSubscriptions(request): Retrieves subscription data.

const subscriptions = new Subscriptions("your-context-id");
const subs = await subscriptions.getSubscriptions({ eventTypeId: "event-type-id" });

All wrappers require a contextId string for gRPC requests. This is provided as an argument in the parse function in the Fusion system.

Types & Enums

• BlockchainType: Enum for supported blockchains (EVM, Solana, Sui, etc.)

Utility Functions

• getParserBlobInput(contextId: string, urlForBlob: string): Fetches and parses block data from storage. The response can be typed as:
  • EvmBlockAndLogs for EVM chains
  • SolanaBlockAndLogs for Solana
  • SuiCheckpointTransactions for Sui This allows you to safely cast and work with chain-specific block data structures in your application. Not applicable to OffChain parsers.

Environment Variables (SDK developer usage)

• EVM_RPC_ADDRESS: EVM gRPC endpoint (default: localhost:50054)
• SUI_RPC_ADDRESS: Sui gRPC endpoint (default: localhost:50057)
• SOLANA_RPC_ADDRESS: Solana gRPC endpoint (default: localhost:50055)
• PERSISTENT_STORAGE_ADDRESS: Persistent storage gRPC endpoint (default: localhost:50053)
• EPHEMERAL_STORAGE_ADDRESS: Ephemeral storage gRPC endpoint (default: localhost:50052)
• SUBSCRIPTION_MANAGER_ADDRESS: Subscriptions gRPC endpoint (default: localhost:50056)
• GRPC_INSECURE: Set to "true" for insecure local connections

Publishing

To publish to npm:

npm publish

Ensure your documentation and API are up to date before publishing.

License

See LICENSE.