Thorchain Quick Start
Thorchain Quick Start
Goals
The goal of this quick start guide is to indexing all deposit messages of Thorchain.
Important
Thorchain is an chain based on the Cosmos SDK. You can index chain data via the standard Cosmos RPC interface but there is no smart contract layer on Thorchain yet.
Before we begin, make sure that you have initialised your project using the provided steps in the Start Here section. You must complete the suggested 4 steps for Cosmos users.
Now, let's move ahead in the process and update these configurations.
Previously, in the 1. Create a New Project section, you must have noted 3 key files. Let's begin updating them one by one.
Tips
The final code of this project can be found here.
1. Update Your Project Manifest File
The Project Manifest (project.yaml
) file is an entry point to your project. It defines most of the details on how SubQuery will index and transform the chain data. For Cosmos chains, there are four types of mapping handlers (and you can have more than one in each project):
- BlockHanders: On each and every block, run a mapping function
- TransactionHandlers: On each and every transaction, run a mapping function
- MessageHandlers: On each and every message that matches optional filter criteria, run a mapping function
- EventHanders: On each and every event that matches optional filter criteria, run a mapping function
Note that the manifest file has already been set up correctly and doesn’t require significant changes, but you need to change the datasource handlers. This section lists the triggers that look for on the blockchain to start indexing.
dataSources:
- kind: cosmos/Runtime
startBlock: 7960001 # This is the lowest height on the current version of Thorchain
mapping:
file: ./dist/index.js
handlers:
- handler: handleMessage
kind: cosmos/MessageHandler
filter:
type: /types.MsgDeposit
The above code defines that you will be running a handleMessage
mapping function whenever there is an message emitted with the /types.MsgDeposit
type. Check out our Manifest File documentation to get more information about the Project Manifest (project.yaml
) file.
2. Update Your GraphQL Schema File
The schema.graphql
file determines the shape of the data that you are using SubQuery to index, hence it's a great place to start. The shape of your data is defined in a GraphQL Schema file with various GraphQL entities.
Update the schema.graphql
file as follows. The aim is to index all deposit messages. Since each deposit can include multiple tokens, we need to define a many-to-many relationship between the Deposit and Coin - we use the DepositCoin entity to link these two entities.
type Deposit @entity {
id: ID!
memo: String!
signer: String!
blockHeight: BigInt!
txHash: String!
}
type DepositCoin @entity {
id: ID!
deposit: Deposit! # foreign key
coin: Coin! # foreign key
amount: BigInt!
}
type Coin @entity {
id: ID! # concat of chain-symbol
chain: String!
symbol: String!
ticker: String!
synth: Boolean
}
Important
When you make any changes to the schema file, do not forget to regenerate your types directory.
yarn codegen
npm run-script codegen
You will find the generated models in the /src/types/models
directory.
As you're creating a new CosmWasm based project, this command will also generate types for your listed protobufs and save them into src/types
directory, providing you with more typesafety. Read about how this is done in Cosmos Codegen from CosmWasm Protobufs.
Check out our GraphQL Schema documentation to get more information on schema.graphql
file.
Now that you have made essential changes to the GraphQL Schema file, let’s go ahead with the next configuration.
3. Add a Mapping Function
Mapping functions determine how chain data is transformed into the optimised GraphQL entities that you previously defined in the schema.graphql
file.
Navigate to the default mapping function in the src/mappings
directory and update your mapping files to match the following (note the additional imports):
import { CosmosMessage } from "@subql/types-cosmos";
import { Coin, Deposit, DepositCoin } from "../types";
import { MsgDeposit } from "../types/proto-interfaces/thorchain/v1/x/thorchain/types/msg_deposit";
export async function handleMessage(
msg: CosmosMessage<MsgDeposit>
): Promise<void> {
// Create Deposit record
const depositEntity = Deposit.create({
id: `${msg.tx.hash}-${msg.idx}`,
blockHeight: BigInt(msg.block.block.header.height),
txHash: msg.tx.hash,
signer: msg.msg.decodedMsg.signer.toString(),
memo: msg.msg.decodedMsg.memo,
});
await depositEntity.save();
// Iterate through coins
for (let coin of msg.msg.decodedMsg.coins) {
// Check if the coin exists
let coinEntity = await Coin.get(`${coin.asset.chain}-${coin.asset.symbol}`);
if (!coinEntity) {
// Does not exist, create
coinEntity = Coin.create({
id: `${coin.asset.chain}-${coin.asset.symbol}`,
chain: coin.asset.chain,
symbol: coin.asset.symbol,
ticker: coin.asset.ticker,
synth: coin.asset.synth,
});
await coinEntity.save();
}
// Create Deposit Coin link
await DepositCoin.create({
id: `${msg.tx.hash}-${msg.idx}-${coin.asset.chain}-${coin.asset.symbol}`,
depositId: depositEntity.id,
coinId: coinEntity.id,
amount: BigInt(coin.amount),
}).save();
}
}
Let’s understand how the above code works. Here, the function receives an CosmosMessage
which includes data on the payload that we decode using the supplied <DepositMethod>
type definition. We extract this data and then create a new Deposit
entity defined earlier in the schema.graphql
file. For each coin
in the deposit message, we then check if the coin is known, and then link it to the Deposit
entity using a DepositCoin
. After that we use the .save()
function to save the new entity (SubQuery will automatically save this to the database). Check out our Mappings documentation and get information on the mapping functions in detail.
4. Build Your Project
Next, build your work to run your new SubQuery project. Run the build command from the project's root directory as given here:
yarn build
npm run-script build
Important
Whenever you make changes to your mapping functions, you must rebuild your project.
Now, you are ready to run your first SubQuery project. Let’s check out the process of running your project in detail.
5. Run Your Project Locally with Docker
Whenever you create a new SubQuery Project, never forget to run it locally on your computer and test it. And using Docker is the most hassle-free way to do this.
docker-compose.yml
file defines all the configurations that control how a SubQuery node runs. For a new project, which you have just initialised, no major changes are needed.
However, visit the Running SubQuery Locally to get more information on the file and the settings.
Run the following command under the project directory:
yarn start:docker
npm run-script start:docker
Tips
It may take a few minutes to download the required images and start the various nodes and Postgres databases.
6. Query your Project
Next, let's query our project. Follow these three simple steps to query your SubQuery project:
Open your browser and head to
http://localhost:3000
.You will see a GraphQL playground in the browser and the schemas which are ready to query.
Find the Docs tab on the right side of the playground which should open a documentation drawer. This documentation is automatically generated and it helps you find what entities and methods you can query.
Try the following queries to understand how it works for your new SubQuery starter project. Don’t forget to learn more about the GraphQL Query language.
query {
deposits(first: 5) {
totalCount
nodes {
id
depositCoins(first: 5) {
nodes {
amount
coin {
id
chain
symbol
ticker
}
}
}
}
}
}
query {
coins(first: 5, orderBy: DEPOSIT_COINS_SUM_AMOUNT_DESC) {
totalCount
nodes {
chain
symbol
ticker
depositCoins(first: 5, orderBy: AMOUNT_DESC) {
totalCount
nodes {
amount
}
}
}
}
}
You will see the result in JSON
Tips
The final code of this project can be found here.
What’s Next?
Congratulations! You have now a locally running SubQuery project that accepts GraphQL API requests for transferring data from bLuna.
Click here to learn what should be your next step in your SubQuery journey.