Using Graph Protocol

You can use The Graph indexing protocol to create subgraphs on SKALE Chain data. You can reach out to the Graph community to request a Graph node, or you may run your own Graph node. These instructions assume you are using the SKALE-IMA-SDK and running your own graph node.

SKALE Chains deployed before Dec 2021 aren’t compatible with EIP-1898, and as such can’t be used with the Graph.

Install Prerequisites
- docker
- docker-compose
- nodejs
- npm
- yarn
- truffle
Start the SKALE-IMA-SDK

Follow instructions here to setup the SKALE-IMA-SDK on a machine.

Configure a Graph Node

git clone https://github.com/graphprotocol/graph-node/
cd graph-node/docker

Then modify the docker-compose.yml file:

ethereum: 'skale:http://host.docker.internal:15000' (1)
...
extra_hosts:
      - "host.docker.internal:host-gateway" (2)

1	Replace with your SKALE Chain endpoint if not using the SKALE-IMA-SDK.
2	Add this if using `host.docker.internal` on a Linux machine.

Start the Graph Node
```
docker-compose up -d
```
To follow the container output, run docker logs docker_graph-node_1 --follow

Prepare the Subgraph test

In another terminal on the same machine, execute:

git clone https://github.com/skalenetwork/se-integrations/
cd se-integrations/graph-protocol/

Modify the .env file.

SKALE_CHAIN=https://YOURSKALECHAINIP:PORT
ACCOUNT=yourAccountFromMetamask
PRIVATE_KEY=<PRIVATE_KEY>
CONTRACT_ADDRESS=<CONTRACT_ADDRESS> (1)

1	You will add the contract address in step 7.

Deploy Test contract

npm install
truffle compile
truffle migrate

Add deployed MyToken Contract address to subgraph.yaml

...
dataSources:
  - kind: ethereum/contract
    name: MyToken
    network: skale (1)
    source:
      address: 'CONTRACT_ADDRESS' (2)
      abi: MyToken
...

1	Change from `mainnet` to `skale` to match docker-compose.yml in graph-node.
2	Replace with deployed contract address.

Add deployed MyToken contract address to .env file
Execute yarn
```
yarn && yarn codegen
```

Create local Subgraph

yarn create-local

Expected output:

Created subgraph: skaleToken
Done in 1.04s.

Expected output in Graph-node container:

Dec 17 23:18:38.892 INFO Received subgraph_create request, params: SubgraphCreateParams { name: SubgraphName("skaleToken") }, component: JsonRpcServer

Deploy to Local
```
yarn deploy-local
```

Verify graph-node terminal

Expected output in graph-node container:

graph-node_1  | Apr 23 20:20:58.952 INFO Scanning blocks [0, 0], range_size: 1, subgraph_id: QmbWZiRDpGb95WkA1QH8UM3wsUMZeBmr6ZW2UJaMtGZADB, component: SubgraphInstanceManager > BlockStream

Execute graph test

truffle test --network skale test/myToken.test.forgraph.js

Expected output:

MyToken
...
    ✓ In the test (237ms)


  1 passing (242ms)

Execute token test

truffle test --network skale test/myToken.test.js

Output:

...
MyBalance
  ✓ enough account balance

MyToken
  ✓ deploys a contract
  ✓ has a default token value (1042ms)
  ✓ can update token value (1042ms)


4 passing (3s)

Check your GraphQL:

http://localhost:8000/subgraphs/name/skaleToken/graphql

Perform a test query:

{
  myTokens(orderBy: tokenValue, orderDirection: asc) {
    id
    owner
  }
}

Expected output:

{
  "data": {
    "myTokens": [
      {
        "id": "0x2",
        "owner": "..."
      }...
    ]
  }
}