vulcan0x

Cache contract data from the blockchain to PostgreSQL.

Reflect a GraphQL schema over the Postgres schema and serve via express.

Specify transformations for watched contracts at dapp/{contract}

Setup

Connection details for Postgres and Ethereum are expected to be defined as environment variables. By default the application will expect a .env file located in the root directory containing these connection details.

e.g vulcan0x/.env

POSTGRES_USER=user
POSTGRES_PASSWORD=password
POSTGRES_HOST=localhost
POSTGRES_PORT=5432
POSTGRES_DB=database

ETH_PROVIDER=ws://localhost:8546
ETH_CHAIN=kovan

DAPPS=oasis:erc20 # specify which watchers to run on sync & subscribe

Alternate configurations can be specified by setting ENV when invoking scripts:

Pass the name of the env file when located in the root directory:

ENV=.mainnet.env npm run subscribe

Or a fullpath to the env if located outside of the root directory:

ENV=/path/to/file/.kovan.env npm run sync
ENV=/path/to/file/.test.env npm run sync
ENV=/path/to/file/.develop.env npm run sync

Usage

Ad-hoc commands:

• npm run migrate - run pending database migrations
• npm run sync - sync log event history from the blockchain to postgres
• npm test - run the test suite

Running processes:

• npm run subscribe - subscribe to new log events on all watched contracts
• npm run graphql - run the graphql server over localhost

Options:

The sync and subscribe commands can be used without options to run against all contracts in the dapp folder or with the --dapp flag to run against a particular contract.

npm run sync -- --dapp=oasis