Subgraph

Example locally hosted subgraph in Acala EVM+.
The Subgraph that we will establish in this example demonstrates how to establish your own Subgraph for projects running in the Acala EVM+.
NOTE: As this example focuses on Subgraph, we won't be analysing the smart contract used. If you wish to learn more about building smart contracts within Acala EVM+, please refer to our tutorials.
Setup
In order to be able to run the example, we need to run the local network first and then spin up the graph-node stack.
Spin up the local development network
You can read up on how to spin up the local development network in the documentation. For those that just want to get started with the Subgraph part, you need to use the following commands:
git clone --recurse-submodules [email protected]:AcalaNetwork/bodhi.js.git
cd bodhi.js/evm-subql
yarn
yarn build
docker compose up
Once the network converges (you should start seeing the evm-subql-mandala-node-1 start reporting that it's ready), open up another terminal and run the RPC adapter:
LOCAL_MODE=1 SUBQL_URL=http://localhost:3001 npx @acala-network/[email protected]^2.4.12
Once you get the following output, your local development network and RPC adapter are ready:
  -------------------------------
  🔨 local development mode is ON
  ❌ don't use it for production!
  -------------------------------
​
2022-06-09 12:20:05        API/INIT: RPC methods not decorated: evm_blockLimits
​
  --------------------------------------------
               🚀 SERVER STARTED 🚀
  --------------------------------------------
  version        : bodhi.js/eth-rpc-adapter/2.4.12
  endpoint url   : ws://0.0.0.0::9944
  subquery url   : http://localhost:3001
  listening to   : http 8545 | ws 3331
  max cacheSize  : 200
  max batchSize  : 50
  max storageSize: 5000
  safe mode      : false
  local mode     : true
  --------------------------------------------
Clone the example repository
Cloning this repository gives access to the Gravity smart contract as well as the migrations needed to deploy it. The truffle.js contains the required network configuration and the configuration files for a local subgraph node are included as well.
The example repository is available here: https://github.com/AcalaNetwork/subgraph-example​
git clone [email protected]:AcalaNetwork/subgraph-example.git
To install the required dependencies simply use:
yarn
This will install all of the dependencies needed to deploy the smart contract to Acala EVM+ and the dependencies required to spin up the subgraph.
The package.json contains scripts that allow for compilation and deployment of the smart contracts in the "scripts" section:
    "build-contract": "truffle compile",
    "deploy-contract": "truffle migrate --network mandala --reset"
Subgraph
The definition of the subgraph lives within subgraph.yaml and doesn't differ from other subgraph definitions. You can learn more about subgraph definitions in the documentation.
The Gravatar is defined in the schema.graphql and doesn't differ from any schema designed for another environment. If you wish to learn more about building schemas, you can do so here.
The subgraph will live in the docker along with docker-hosted IPFS and Postgres. You can check out how the all of them connect to each other and to the already-running local development network in the docker-compose.yml.
Usage
In order to use the locally hosted subgraph, we need to spin up our Docker containers by using:
docker compose up
Once the containers are running, you should see the following output:
subgraph-example-graph-node-1  | Jun 14 21:44:32.410 INFO Starting block ingestors with 1 chains [acala]
subgraph-example-graph-node-1  | Jun 14 21:44:32.410 INFO Starting block ingestor for network, network_name: acala
subgraph-example-graph-node-1  | Jun 14 21:44:32.411 INFO Starting firehose block ingestors with 0 chains []
subgraph-example-graph-node-1  | Jun 14 21:44:32.411 INFO Starting firehose block ingestors with 0 chains []
subgraph-example-graph-node-1  | Jun 14 21:44:32.412 INFO Starting job runner with 4 jobs, component: JobRunner
subgraph-example-graph-node-1  | Jun 14 21:44:32.452 INFO Starting JSON-RPC admin server at: http://localhost:8020, component: JsonRpcServer
subgraph-example-graph-node-1  | Jun 14 21:44:32.468 INFO Starting GraphQL HTTP server at: http://localhost:8000, component: GraphQLServer
subgraph-example-graph-node-1  | Jun 14 21:44:32.471 INFO Starting index node server at: http://localhost:8030, component: IndexNodeServer
subgraph-example-graph-node-1  | Jun 14 21:44:32.475 INFO Starting metrics server at: http://localhost:8040, component: MetricsServer
subgraph-example-graph-node-1  | Jun 14 21:44:32.476 INFO Starting GraphQL WebSocket server at: ws://localhost:8001, component: SubscriptionServer
subgraph-example-graph-node-1  | Jun 14 21:44:32.524 INFO Started all assigned subgraphs, node_id: default, count: 1, component: SubgraphRegistrar
subgraph-example-graph-node-1  | Jun 14 21:44:32.695 INFO Resolve subgraph files using IPFS, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.702 INFO Resolve schema, link: /ipfs/QmbSFRGGvHM7Cn8YSjDL41diDMxN4LQUDEMqaa5VVc5sC4, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.703 INFO Resolve data source, source_start_block: 0, source_address: Some(0xf80a32a835f79d7787e8a8ee5721d0feafd78108), name: Gravity, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.704 INFO Resolve mapping, link: /ipfs/Qmf1LHCv7pcM4sVykN4uTocLPSwHN5o9JzWcuLU9pqHgXF, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.704 INFO Resolve ABI, link: /ipfs/QmajZTadknSpgsCWRz9fG6bXFHdpVXPMWpx9yMipz3VtMQ, name: Gravity, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.728 INFO Successfully resolved subgraph files using IPFS, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:32.728 INFO Data source count at start: 1, sgd: 1, subgraph_id: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm, component: SubgraphInstanceManager
subgraph-example-graph-node-1  | Jun 14 21:44:33.076 ERRO registering metric [deployment_eth_rpc_request_duration] because it was already registered, component: MetricsRegistry
subgraph-example-graph-node-1  | Jun 14 21:44:33.077 ERRO registering metric [deployment_eth_rpc_errors] because it was already registered, component: MetricsRegistry
We are now ready to deploy the local subgraph. The steps to deploy it can be separated into two distinct groups:
1.Build and deploy the Gravitar smart contract to Acala EVM+
2.Create and deploy the subgraph
Build and deploy the Gravitar smart contract to Acala EVM+
We can optionally reset the project by using the clean script:
    "clean": "rm -rf data/ generated/ build/ temp/ lib/ network.json"
To be able to easily build the smart contract as well as deploy it, build-contract and deploy-contract scripts have to be added to package.json:
    "build-contract": "truffle compile",
    "deploy-contract": "truffle migrate --network mandala --reset"
Running these scripts should succecssfully deploy the smart contract and populate the gravatars:
yarn clean             #optional
yarn build-contract
yarn deploy-contract
Now that the smart contract has been successfully deployed, we can move on to deploying the subgraph.
Create and deploy the subgraph
Scripts to generate the Graph code, build it, create and deploy it need to be added to the package.json:
    "build-graph": "graph build",
    "create-local": "graph create acala/examplesubgraph --node http://127.0.0.1:8020",
    "remove-local": "graph remove acala/examplesubgraph --node http://127.0.0.1:8020",
    "deploy-local": "graph deploy acala/examplesubgraph --ipfs http://127.0.0.1:5001 --node http://127.0.0.1:8020"
Running them should deploy the subgraph:
yarn codegen
yarn build-graph
yarn create-local
yarn deploy-local
When running the deploy-local script, you can decide to specify the version of the subgraph, but for the example purposes accepting the default value should suffice:
yarn deploy-local
yarn run v1.22.19
$ graph deploy acala/examplesubgraph --ipfs http://127.0.0.1:5001 --node http://127.0.0.1:8020
✔ Version Label (e.g. v0.0.1) · 
  Skip migration: Bump mapping apiVersion from 0.0.1 to 0.0.2
  Skip migration: Bump mapping apiVersion from 0.0.2 to 0.0.3
  Skip migration: Bump mapping apiVersion from 0.0.3 to 0.0.4
  Skip migration: Bump mapping apiVersion from 0.0.4 to 0.0.5
  Skip migration: Bump mapping specVersion from 0.0.1 to 0.0.2
✔ Apply migrations
✔ Load subgraph from subgraph.yaml
  Compile data source: Gravity => build/Gravity/Gravity.wasm
✔ Compile subgraph
  Copy schema file build/schema.graphql
  Write subgraph file build/Gravity/abis/Gravity.json
  Write subgraph manifest build/subgraph.yaml
✔ Write compiled subgraph to build/
  Add file to IPFS build/schema.graphql
                .. QmbSFRGGvHM7Cn8YSjDL41diDMxN4LQUDEMqaa5VVc5sC4
  Add file to IPFS build/Gravity/abis/Gravity.json
                .. QmajZTadknSpgsCWRz9fG6bXFHdpVXPMWpx9yMipz3VtMQ
  Add file to IPFS build/Gravity/Gravity.wasm
                .. Qmf1LHCv7pcM4sVykN4uTocLPSwHN5o9JzWcuLU9pqHgXF
✔ Upload subgraph to IPFS
​
Build completed: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm
​
Deployed to http://127.0.0.1:8000/subgraphs/name/acala/examplesubgraph/graphql
​
Subgraph endpoints:
Queries (HTTP):     http://127.0.0.1:8000/subgraphs/name/acala/examplesubgraph
Subscriptions (WS): http://127.0.0.1:8001/subgraphs/name/acala/examplesubgraph
​
✨  Done in 6.19s.
As you can see, we can now interact with the locally deployed subgraph.
Quick build script
As an additionally supported script, we have added the run-all script to the package.json, which can be used to quickly deploy the smart contract as well as the locally hosted subgraph:
yarn run-all
yarn run v1.22.19
$ yarn build-all && yarn deploy-all
$ yarn clean && yarn build-contract && yarn codegen && yarn build-graph
$ rm -rf data/ generated/ build/ temp/ lib/ network.json
$ truffle compile
​
Compiling your contracts...
===========================
> Compiling ./contracts/Gravity.sol
> Compiling ./contracts/Migrations.sol
> Artifacts written to /Users/jan/Acala/subgraph-example/build/contracts
> Compiled successfully using:
   - solc: 0.4.25+commit.59dbf8f1.Emscripten.clang
$ graph codegen
  Skip migration: Bump mapping apiVersion from 0.0.1 to 0.0.2
  Skip migration: Bump mapping apiVersion from 0.0.2 to 0.0.3
  Skip migration: Bump mapping apiVersion from 0.0.3 to 0.0.4
  Skip migration: Bump mapping apiVersion from 0.0.4 to 0.0.5
  Skip migration: Bump mapping specVersion from 0.0.1 to 0.0.2
✔ Apply migrations
✔ Load subgraph from subgraph.yaml
  Load contract ABI from abis/Gravity.json
✔ Load contract ABIs
  Generate types for contract ABI: Gravity (abis/Gravity.json)
  Write types to generated/Gravity/Gravity.ts
✔ Generate types for contract ABIs
✔ Generate types for data source templates
✔ Load data source template ABIs
✔ Generate types for data source template ABIs
✔ Load GraphQL schema from schema.graphql
  Write types to generated/schema.ts
✔ Generate types for GraphQL schema
​
Types generated successfully
​
$ graph build
  Skip migration: Bump mapping apiVersion from 0.0.1 to 0.0.2
  Skip migration: Bump mapping apiVersion from 0.0.2 to 0.0.3
  Skip migration: Bump mapping apiVersion from 0.0.3 to 0.0.4
  Skip migration: Bump mapping apiVersion from 0.0.4 to 0.0.5
  Skip migration: Bump mapping specVersion from 0.0.1 to 0.0.2
✔ Apply migrations
✔ Load subgraph from subgraph.yaml
  Compile data source: Gravity => build/Gravity/Gravity.wasm
✔ Compile subgraph
  Copy schema file build/schema.graphql
  Write subgraph file build/Gravity/abis/Gravity.json
  Write subgraph manifest build/subgraph.yaml
✔ Write compiled subgraph to build/
​
Build completed: /Users/jan/Acala/subgraph-example/build/subgraph.yaml
​
$ yarn deploy-contract && yarn create-local && yarn deploy-local
$ truffle migrate --network mandala --reset
​
Compiling your contracts...
===========================
> Everything is up to date, there is nothing to compile.
​
​
Starting migrations...
======================
> Network name:    'mandala'
> Network id:      595
> Block gas limit: 15000000 (0xe4e1c0)
​
​
1_initial_migration.js
======================
​
   Deploying 'Migrations'
   ----------------------
   > transaction hash:    0xa4c6295639c832781b5a08d0e1caf7f048de2e11cc486532c3aa5202d78226ad
   > Blocks: 0            Seconds: 0
   > contract address:    0x1a906E71FF9e28d8E01460639EB8CF0a6f0e2486
   > block number:        17
   > block timestamp:     1655246466
   > account:             0x75E480dB528101a381Ce68544611C169Ad7EB342
   > balance:             10000990.675883098224
   > gas used:            239894 (0x3a916)
   > gas price:           11251.291893661 gwei
   > value sent:          0 ETH
   > total cost:          2.699117417537911934 ETH
​
   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:     2.699117417537911934 ETH
​
​
2_deploy_contract.js
====================
​
   Deploying 'GravatarRegistry'
   ----------------------------
   > transaction hash:    0x0539850eaa0f34b8583fa38af76436876f1e2edd8db584437f82346be1b98417
   > Blocks: 0            Seconds: 0
   > contract address:    0x78b1F763857C8645E46eAdD9540882905ff32Db7
   > block number:        19
   > block timestamp:     1655246478
   > account:             0x75E480dB528101a381Ce68544611C169Ad7EB342
   > balance:             10000988.456154170068
   > gas used:            1214156 (0x1286cc)
   > gas price:           2974.008289142 gwei
   > value sent:          0 ETH
   > total cost:          3.610910008311494152 ETH
​
   > Saving migration to chain.
   > Saving artifacts
   -------------------------------------
   > Total cost:     3.610910008311494152 ETH
​
​
3_create_gravatars.js
=====================
Account address: 0x78b1F763857C8645E46eAdD9540882905ff32Db7
   > Saving migration to chain.
   -------------------------------------
   > Total cost:                   0 ETH
​
Summary
=======
> Total deployments:   2
> Final cost:          6.310027425849406086 ETH
​
​
$ graph create acala/examplesubgraph --node http://127.0.0.1:8020
Created subgraph: acala/examplesubgraph
$ graph deploy acala/examplesubgraph --ipfs http://127.0.0.1:5001 --node http://127.0.0.1:8020
✔ Version Label (e.g. v0.0.1) · 
  Skip migration: Bump mapping apiVersion from 0.0.1 to 0.0.2
  Skip migration: Bump mapping apiVersion from 0.0.2 to 0.0.3
  Skip migration: Bump mapping apiVersion from 0.0.3 to 0.0.4
  Skip migration: Bump mapping apiVersion from 0.0.4 to 0.0.5
  Skip migration: Bump mapping specVersion from 0.0.1 to 0.0.2
✔ Apply migrations
✔ Load subgraph from subgraph.yaml
  Compile data source: Gravity => build/Gravity/Gravity.wasm
✔ Compile subgraph
  Copy schema file build/schema.graphql
  Write subgraph file build/Gravity/abis/Gravity.json
  Write subgraph manifest build/subgraph.yaml
✔ Write compiled subgraph to build/
  Add file to IPFS build/schema.graphql
                .. QmbSFRGGvHM7Cn8YSjDL41diDMxN4LQUDEMqaa5VVc5sC4
  Add file to IPFS build/Gravity/abis/Gravity.json
                .. QmajZTadknSpgsCWRz9fG6bXFHdpVXPMWpx9yMipz3VtMQ
  Add file to IPFS build/Gravity/Gravity.wasm
                .. Qmf1LHCv7pcM4sVykN4uTocLPSwHN5o9JzWcuLU9pqHgXF
✔ Upload subgraph to IPFS
​
Build completed: QmWbRi1CvZGy2sKbdp549dH99KDbALZKy3133WyK1CgaHm
​
Deployed to http://127.0.0.1:8000/subgraphs/name/acala/examplesubgraph/graphql
​
Subgraph endpoints:
Queries (HTTP):     http://127.0.0.1:8000/subgraphs/name/acala/examplesubgraph
Subscriptions (WS): http://127.0.0.1:8001/subgraphs/name/acala/examplesubgraph
​
✨  Done in 24.44s.
Subgraph interaction
The playground is reachable at http://127.0.0.1:8000/subgraphs/name/acala/examplesubgraph/graphql. You can query the gravatars from the Gravity smart contract using the following query:
query {
  gravatars {
    id,
    displayName,
    imageUrl,
    owner
  }
}
The result should give information about three gravatars:
{
  "data": {
    "gravatars": [
      {
        "id": "0x0",
        "displayName": "AAAAA",
        "imageUrl": "https://example/AAAAA.png",
        "owner": "0x75e480db528101a381ce68544611c169ad7eb342"
      },
      {
        "id": "0x1",
        "displayName": "BBBBB",
        "imageUrl": "https://example/BBBBB.jpg",
        "owner": "0x0085560b24769dac4ed057f1b2ae40746aa9aab6"
      },
      {
        "id": "0x2",
        "displayName": "CCCCC",
        "imageUrl": "https://example/CCCCC.jpg",
        "owner": "0x0294350d7cf2c145446358b6461c1610927b3a87"
      }
    ]
  }
}
Querying the local subgraph
This concludes out locally hosted subgraph example in Acala EVM+.
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