Lotus JS Client Schema

This package contains some .js files that describe methods exported by the Lotus JSON-RPC API.

See filecoin-shipyard/js-lotus-client for examples that show how to use these schemas.

Usage

const { LotusRPC } = require('@filecoin-shipyard/lotus-client-rpc')
const { NodejsProvider } = require('@filecoin-shipyard/lotus-client-provider-nodejs')
const { mainnet } = require('@filecoin-shipyard/lotus-client-schema')

const url = 'ws://127.0.0.1:7777/rpc/v0'
const provider = new NodejsProvider(url)
const client = new LotusRPC(provider, { schema: mainnet.fullNode })

Schemas

The following schema objects are exported:

• mainnet.fullNode - used to talk to a Lotus "Full Node" (lotus)
• mainnet.storageMiner - used to talk to a Lotus storage miner (lotus-miner)
• mainnet.gatewayApi - used to talk to public Lotus API Gateway (lotus-gateway)
• mainnet.walletApi - a subset of methods for wallets
• mainnet.workerApi - used to talk to lotus-worker (for mining)
• mainnet.common - a subset of methods used by a number of different daemons

Schema Format

Right now, the schema is extremely simple, as the JS library only needs to know if a method supports subscriptions or not. The JS library is very light, so all method parameters are just passed through to the JSON-RPC request.

In the future, the schema could be extended to provide more parameter and type information to make it easier to validate and marshal/unmarshal requests and responses.

For example, the entry for the ChainHead method is currently just:

  ChainHead: {}

The ChainNotify entry supports JSON-RPC subscriptions, so it looks like this:

  ChainNotify: {
    subscription: true
  }

Each API is represented by an Object with a single methods property which is an Object with all the methods supported.

If you are trying to use a JSON-RPC API method that isn't in the schema yet, don't be afraid to "monkey-patch" the schemas distributed via this package to add any missing methods ... eg. mainnet.fullNode.methods.MyMissingMethod = {}

Updating the schemas

Lotus is constantly being updated. There is a simple tool (written in go) in the go-schemagen directory that links against a Lotus source code tree (modify the replace directory in go.mod or make a symlink) and outputs the current set of method signatures as JSON. The generate-schema-for-api.sh script can be used to generate the JavaScript schemas. To simplify the process, there is an npm script to run the update:

npm run build:schema

TypeScript definitions

The TypeScript definitions generated by go-tsgen are used by the @filecoin-shipyard/lotus-client-rpc package. See https://github.com/filecoin-shipyard/js-lotus-client-rpc#re-generating-typescript-definitions for details on how to update the definitions in that package using the tool located here.

License

Licensed under either of

• Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
• MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.