emerald-web3-gateway

emerald-web3-gateway

Web3 Gateway for Oasis Emerald EVM.

Building and Testing

Prerequisites

• Go (at least version 1.17.3).
• PostgreSQL (at least version 13.3).

Additionally, for testing:

• Oasis Core version 21.3.7.
• Emerald Paratime version 6.0.0.

Build

To build the binary run:

make build

Test

To run tests:

Start PostgreSQL (for testing Postgres Docker container can be used):

docker run --rm --name postgres -e POSTGRES_PASSWORD=postgres -p 5432:5432 postgres:13.3-alpine

In a separate terminal, start an Oasis development network:

export OASIS_EMERALD_VERSION=6.0.0
export OASIS_NET_RUNNER=<path-to-oasis-core-artifacts>/oasis-net-runner
export OASIS_NODE=<path-to-oasis-core-artifacts>/oasis-node
export OASIS_EMERALD_PARATIME=<path-to-emerald-paratime>/emerald-paratime
export OASIS_NODE_DATADIR=/tmp/oasis-evm-gateway-tests

./tests/tools/spinup-oasis-stack.sh

Run tests:

make test

Running the Gateway on Testnet/Mainnet

The gateway connects to an Emerald enabled Oasis Paratime Client Node.

Set up the config file (e.g. gateway.yml) appropriately:

runtime_id: <emerald_paratime_id>
node_address: "unix:<path-to-oasis-node-unix-socket>"
enable_pruning: false
pruning_step: 100000
indexing_start: 0

log:
  level: debug
  format: json

database:
  host: <postgresql_host>
  port: <postgresql_port>
  db: <postgresql_db>
  user: <postgresql_user>
  password: <postgresql_password>
  dial_timeout: 5
  read_timeout: 10
  write_timeout: 5
  max_open_conns: 0

gateway:
  chain_id: <emerald_chain_id>
  http:
    host: <gateway_listen_interface>
    port: <gateway_listen_port>
    cors: ["*"]
  ws:
    host: <gateway_listen_interface>
    port: <gateway_listen_websocket_port>
    origins: ["*"]
  method_limits:
    get_logs_max_rounds: 100

Note: all configuration settings can also be set via environment variables. For example to set the database password use:

DATABASE__PASSWORD: <postgresql_password>

environment variable.

Start the gateway by running the emerald-web3-gateway binary:

emerald-web3-gateway --config gateway.yml

Wipe state to force a complete reindex

To wipe the DB state and force a reindexing use the truncate-db subcommand:

emerald-web3-gateway truncate-db --config gateway.yml --unsafe

Warning: this will wipe all existing state in the Postgres DB and can lead to extended downtime while the Web3 Gateway is reindexing the blocks.

Contributing

See our Contributing Guidelines.

Versioning

See our Versioning document.

Release Process

See our Release Process document.

Credits

Parts of the code heavily based on go-ethereum.