chainsafe / graph-ts

TypeScript/AssemblyScript library for writing mappings for The Graph

The Graph TypeScript Library (graph-ts)

TypeScript/AssemblyScript library for writing subgraph mappings to be deployed to The Graph.

Usage

For a detailed guide on how to create a subgraph, please see the Graph CLI docs.

One step of creating the subgraph is writing mappings that will process blockchain events and will write entities into the store. These mappings are written in TypeScript/AssemblyScript.

The graph-ts library provides APIs to access the Graph Node store, blockchain data, smart contracts, data on IPFS, cryptographic functions and more. To use it, all you have to do is add a dependency on it:

npm install --dev @graphprotocol/graph-ts # NPM
yarn add --dev @graphprotocol/graph-ts    # Yarn

After that, you can import the store API and other features from this library in your mappings. A few examples:

import { store, crypto } from '@graphprotocol/graph-ts'

// This is just an example event type generated by `graph-cli`
// from an Ethereum smart contract ABI
import { NameRegistered } from './types/abis/SomeContract'

// This is an example of an entity type generated from a
// subgraph's GraphQL schema
import { Domain } from './types/schema'

function handleNameRegistered(event: NameRegistered) {
  // Example use of a crypto function
  let id = crypto.keccak256(name).toHexString()

  // Example use of the generated `Entry` class
  let domain = new Domain()
  domain.name = name
  domain.owner = event.params.owner
  domain.timeRegistered = event.block.timestamp

  // Example use of the store API
  store.set('Name', id, entity)
}

Helper Functions for AssemblyScript

Refer to the helper-functions.ts file in this repository for a few common functions that help build on top of the AssemblyScript library, such as byte array concatenation, among others.

API

Documentation on the API can be found here.

For examples of graph-ts in use take a look at one of the following subgraphs:

• https://github.com/graphprotocol/ens-subgraph
• https://github.com/graphprotocol/decentraland-subgraph
• https://github.com/graphprotocol/adchain-subgraph
• https://github.com/graphprotocol/0x-subgraph
• https://github.com/graphprotocol/aragon-subgraph
• https://github.com/graphprotocol/dharma-subgraph

Release process

The steps to create a new version of the graph-ts are:

1. Decide which version number you'll be rolling out. You can check the differences between the current master branch and the latest release.
2. Create a PR with the commit generated by npm version <VERSION> [<PREID>].
3. Once that's approved and merged to master, you can publish it to npm and push the git tags as well.
4. Last but not least, create a Github Release refering to the pushed git tag, linking to the PRs involved.

Helpful links:

• Semver official docs
• npm version docs
• npm publish docs
• npm unpublish docs
• npm deprecate docs

Stable release example

Current version: 0.34.9. Desired release: 0.35.0.

To create the PR:

git checkout -b <BRANCH>

npm version minor

git push --set-upstream <REMOTE> <BRANCH>

Once that's approved and merged, you can update your local master and:

npm publish

npm push --tags

Alpha release example

Current version: 0.29.2. Desired release: 0.30.0-alpha.0.

To create the PR:

git checkout -b <BRANCH>

npm version preminor --preid alpha

git push --set-upstream <REMOTE> <BRANCH>

Once that's approved and merged, you can update your local master and:

npm publish --tag alpha

npm push --tags

Alpha pre-release example

Current version: 0.30.0-alpha.0. Desired release: 0.30.0-alpha.1.

To create the PR:

git checkout -b <BRANCH>

npm version prerelease --preid alpha

git push --set-upstream <REMOTE> <BRANCH>

Once that's approved and merged, you can update your local master and:

npm publish --tag alpha

npm push --tags

License

Copyright © 2018 Graph Protocol, Inc. and contributors.

The Graph TypeScript library is dual-licensed under the MIT license and the Apache License, Version 2.0.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.