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SmartWeave SDK v2

SmartWeave SDK v2 is the new, rewritten from scratch, SDK implementation proposal for interaction with SmartWeave Contracts. It has been built with performance (e.g. caching at multiple layers, Arweave calls optimization) and modularity (e.g. ability to use different types of caches, imported from external libraries) in mind.

Warning: SDK is currently in alpha version.

We're already using the new SDK on production, both in our webapp and nodes. However, if you'd like to use it in production as well, please contact us on discord to ensure a smooth transition and get help with testing.

The base motivation behind rewriting SmartWeave SDK (and roadmap proposal) has been described here.
To further improve contract state evaluation time, one can additionally use AWS CloudFront based Arweave cache described in AWS CloudFront Cache.

Installation and import

Using npm

npm install redstone-smartweave

Using yarn

yarn add redstone-smartweave

You can import the full API or individual modules.

import * as SmartWeaveSdk from 'redstone-smartweave'
import { SmartWeave, Contract, ... } from 'redstone-smartweave'


Usage examples can be found in a dedicated repository. Please follow instructions in its README.md (and detail-ish comments in the examples files) to learn more.

Missing features

The features below are not yet implemented. They will be either added soon to the core SDK, or as a separate libraries, built on top of the SDK:

  • deploying contracts
  • arTransfer and tags handling for "viewState" ("interactRead")
  • "dry-runs" (though not sure if this should be part of the "core" SDK)
  • CLI (though not sure if that is a necessary - even if, it should be probably a separate lib built on top of the base SDK).

Source code structure

SDK's source code is divided into few main modules.

Core package

Code located in the core package contains all the main modules of the reference SDK v2 implementation. These modules are used to create instances of SmartWeave - main class that allows to connect to contracts. There are currently 5 core interfaces:

  1. DefinitionLoader - it is responsible for loading contract's definition (i.e. its source code, initial state, etc.) Its reference implementation is ContractDefinitionLoader.
  2. ExecutorFactory - factory responsible for creating executors that run contract's source code. Its reference implementation is HandlerExecutorFactory - which produces handlers that run contracts written using the "handle" function. In the future - more advanced ExecutorFactoryies can be implemented - e.g. such that will allow code exception isolation or running contracts written in a more OOP style.
    Please note that new SDK version allows calling viewState (interactRead from the current version) from within the contract source code.
  3. InteractionsLoader - responsible for loading interaction transactions, with reference implementation in ContractInteractionsLoader
  4. InteractionsSorter - self-explanatory ;-) Two implementations - LexicographicalInteractionsSorter - same, as in current SDK, and LexicographicalInteractionsSorter - based on a PR https://github.com/ArweaveTeam/SmartWeave/pull/82
  5. StateEvaluator - responsible for evaluating the state for a given set of transactions, with reference DefaultStateEvaluator.
    Please note that DefaultStateEvaluator currently by default doest not stop processing in case of any exception result type from state evaluation (to be backwards compatible with current SDK version) - though we still can't decide whether it is a proper behaviour. You can change this behaviour by modifying EvaluationOptions.

Additionally, the core package contains the definition of all the tags used by the protocol - SmartWeaveTags.

All interfaces and implementations are further described in TSDocs.

Contract package

Code located in the contract package contains base contract interface - Contract and its "reference" implementation - HandlerBasedContract - that allows to interact with contracts. To connect to a contract, first an instance of the SmartWeave must be created. Refer the TSDocs for more information.

Cache package

Code located in the cache package contains base interfaces - SwCache and BlockHeightSwCache and some example implementations. These caches can be used while configuring SmartWeave instance - to greatly improve processing speed (i.e. contract's state evaluation) . Refer the TSDocs for more information.

Plugins package

This package contains some example extensions to base implementation, adding features like "Evolve", caching capabilities to InteractionsLoader, ExecutorFactory and StateEvaluator, etc.

One cool plugin is the DebuggableExecutorFactor - it's a wrapper over ExecutorFactory that adds a feature of changing the contract's code "on the fly" (while evaluating the state) - without the need of deploying anything on Arweave.
This is really useful while debugging contracts (e.g. quickly adding some console.logs in contract's source code) or quickly testing new features.

Legacy package

This package contains some code from the current SDK implementation - most of this code will be probably remove with the future releases of the new SDK implementation.

Logger package

TODO: add description

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