ipld-eth-server/README.md

Vulcanize DB

Development Setup

Dependencies

• Go 1.9+
• https://github.com/golang/dep
  • go get -u github.com/golang/dep/cmd/dep
• https://github.com/go-godo/godo
  • go get -u gopkg.in/godo.v2/cmd/godo
• Postgres 10
• Go Ethereum
  • https://ethereum.github.io/go-ethereum/downloads/

Cloning the Repository

1. git config --global url."git@github.com:".insteadOf "https://github.com/"
   • By default, go get does not work for private GitHub repos. This will fix that.
2. go get github.com/8thlight/vulcanizedb
3. cd $GOPATH/src/github.com/8thlight/vulcanizedb
4. dep ensure

Setting up the Databases

1. Install Postgres
2. Create a superuser for yourself and make sure psql --list works without prompting for a password.
3. go get -u -d github.com/mattes/migrate/cli github.com/lib/pq
4. go build -tags 'postgres' -o /usr/local/bin/migrate github.com/mattes/migrate/cli
5. createdb vulcanize_private
6. cd $GOPATH/src/github.com/8thlight/vulcanizedb
7. godo migrate -- --environment=<some-environment>
   • See below for configuring additional environments

Adding a new migration: ./scripts/create_migration <migration-name>

Creating/Using a Private Blockchain

Syncing the public blockchain takes many hours for the initial sync and will download 20+ GB of data. Here are some instructions for creating a private blockchain that does not depend on having a network connection.

1. Run ./scripts/setup to create a private blockchain with a new account.
   • This will result in a warning.
2. Run ./scripts/start_private_blockchain.
3. Run godo run -- --environment=private to start listener.

Connecting to the Public Blockchain

./scripts/start_blockchain

IPC File Paths

The default location for Ethereum is:

• $HOME/Library/Ethereum for Mac
• $HOME/.ethereum for Ubuntu
• $GOPATH/src/gihub.com/8thlight/vulcanizedb/test_data_dir/geth.ipc for private blockchain.

Note the location of the ipc file is outputted when you connect to a blockchain. It is needed to for configuration

Start Vulcanize DB

1. Start geth
2. In a separate terminal start vulcanize_db
   • godo vulcanizeDb -- --environment=<some-environment>

Watch contract events

1. Start geth
2. In a separate terminal start vulcanize_db
   • godo vulcanizeDb -- --environment=<some-environment>
3. Create event filter
   • godo watchEvent -- --environment=<some-environment> --filter-filepath=<filters/example-filer.json>

Running Listener

1. Start geth
2. In a separate terminal start listener (ipcDir location)
   • godo run -- --environment=<some-environment>

Retrieving Historical Data

1. Start geth
2. In a separate terminal start listener (ipcDir location)
   • godo populateBlocks -- --environment=<some-environment> --starting-number=<starting-block-number>

Retrieve Contract Attributes

1. Add contract ABI to contracts / environment directory:

vulcanizedb/
    contracts/
        public/
            <contract-address>.json
        private/

The name of the JSON file should correspond the contract's address.

2. Start watching the contract godo watchContract -- --environment=<some-environment> --contract-hash=<contract-address>
3. Request summary data godo showContractSummary -- --environment=<some-environment> --contract-hash=<contract-address>

Configuring Additional Environments

You can create configuration files for additional environments.

• Among other things, it will require the IPC file path
• See environments/private.toml for an example
• You will need to do this if you want to run a node connecting to the public blockchain

Running the Tests

Unit Tests

1. go test ./pkg/...

Integration Test

In order to run the integration tests, you will need to run them against a real blockchain. At the moment the integration tests require Geth v1.7.2 as they depend on the --dev mode, which changed in v1.7.3

1. Run ./scripts/start_private_blockchain as a separate process.
2. go test ./... to run all tests.