The Graph is a protocol for building decentralized applications (dApps) quickly on Ethereum and IPFS using GraphQL.

Graph Node is an open source Rust implementation that event sources the Ethereum blockchain to deterministically update a data store that can be queried via the GraphQL endpoint.

For detailed instructions and more context, check out the Getting Started Guide.

To build and run this project you need to have the following installed on your system:

• Rust (latest stable) – How to install Rust
• PostgreSQL – PostgreSQL Downloads
• IPFS – Installing IPFS

For Ethereum network data, you can either run a local node or use Infura.io:

• Local node – Installing and running Ethereum node
• Infura infra – Infura.io

This is a quick example to show a working Graph Node. It is a subgraph for the Ethereum Name Service (ENS) that The Graph team built.

1. Install IPFS and run ipfs init followed by ipfs daemon.
2. Install PostgreSQL and run initdb -D .postgres followed by pg_ctl -D .postgres -l logfile start and createdb graph-node.
3. If using Ubuntu, you may need to install additional packages:
   • sudo apt-get install -y clang libpq-dev libssl-dev pkg-config
4. In the terminal, clone https://github.com/graphprotocol/ens-subgraph, and install dependencies and generate types for contract ABIs:

yarn
yarn codegen

5. In the terminal, clone https://github.com/graphprotocol/graph-node, and run cargo build.

Once you have all the dependencies set up, you can run the following:

cargo run -p graph-node --release -- \
  --postgres-url postgresql://USERNAME[:PASSWORD]@localhost:5432/graph-node \
  --ethereum-rpc mainnet:https://mainnet.infura.io/v3/[PROJECT_ID] \
  --ipfs 127.0.0.1:5001

Try your OS username as USERNAME and PASSWORD. The password might be optional. It depends on your setup.

If you're using Infura you should sign up to get a PROJECT_ID, it's free.

This will also spin up a GraphiQL interface at http://127.0.0.1:8000/.

6. With this ENS example, to get the subgraph working locally run:

yarn create-local

Then you can deploy the subgraph:

yarn deploy-local

This will build and deploy the subgraph to the Graph Node. It should start indexing the subgraph immediately.

USAGE:
    graph-node [FLAGS] [OPTIONS] --ethereum-ipc <NETWORK_NAME:FILE> --ethereum-rpc <NETWORK_NAME:URL> --ethereum-ws <NETWORK_NAME:URL> --ipfs <HOST:PORT> --postgres-url <URL>

FLAGS:
        --debug      Enable debug logging
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
        --admin-port <PORT>                           Port for the JSON-RPC admin server [default: 8020]
        --elasticsearch-password <PASSWORD>
            Password to use for Elasticsearch logging [env: ELASTICSEARCH_PASSWORD]

        --elasticsearch-url <URL>
            Elasticsearch service to write subgraph logs to [env: ELASTICSEARCH_URL=]

        --elasticsearch-user <USER>                   User to use for Elasticsearch logging [env: ELASTICSEARCH_USER=]
        --ethereum-ipc <NETWORK_NAME:FILE>
            Ethereum network name (e.g. 'mainnet') and Ethereum IPC pipe, separated by a ':'

        --ethereum-polling-interval <MILLISECONDS>
            How often to poll the Ethereum node for new blocks [env: ETHEREUM_POLLING_INTERVAL=]  [default: 500]

        --ethereum-rpc <NETWORK_NAME:URL>
            Ethereum network name (e.g. 'mainnet') and Ethereum RPC URL, separated by a ':'

        --ethereum-ws <NETWORK_NAME:URL>
            Ethereum network name (e.g. 'mainnet') and Ethereum WebSocket URL, separated by a ':'

        --http-port <PORT>                            Port for the GraphQL HTTP server [default: 8000]
        --ipfs <HOST:PORT>                            HTTP address of an IPFS node
        --node-id <NODE_ID>                           a unique identifier for this node [default: default]
        --postgres-url <URL>                          Location of the Postgres database used for storing entities
        --subgraph <[NAME:]IPFS_HASH>                 name and IPFS hash of the subgraph manifest
        --ws-port <PORT>                              Port for the GraphQL WebSocket server [default: 8001]

See here for a list of the environment variables that can be configured.

• node — A local Graph Node.
• graph — A library providing traits for system components and types for common data.
• core — A library providing implementations for core components, used by all nodes.
• chain/ethereum — A library with components for obtaining data from Ethereum.
• graphql — A GraphQL implementation with API schema generation, introspection, and more.
• mock — A library providing mock implementations for all system components.
• runtime/wasm — A library for running WASM data-extraction scripts.
• server/http — A library providing a GraphQL server over HTTP.
• store/postgres — A Postgres store with a GraphQL-friendly interface and audit logs.

🔨 = In Progress

🛠 = Feature complete. Additional testing required.

✅ = Feature complete

Please check CONTRIBUTING.md for development flow and conventions we use. Here's a list of good first issues.

Copyright © 2018-2019 Graph Protocol, Inc. and contributors.

The Graph 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 expressed or implied. See the License for the specific language governing permissions and limitations under the License.