Skip to content

HowToUseTheGraph.md

Latest commit

 

History

History
73 lines (50 loc) · 2.17 KB

HowToUseTheGraph.md

File metadata and controls

73 lines (50 loc) · 2.17 KB
Raw

TheGraph

Without TheGraph

How to do?

  1. Create node server
  2. Fetch events or state data throw RPC or Subscribe events.
  3. Save data to db

this is not optimal:

  • Doesn't work for already deployed contracts.
  • Extra gas costs for storing those values.
  • Requires another call to fetch the data for an Ethereum node.

A better solution: TheGraph

Learn: https://thegraph.com/ecosystem/learn/

  • Build faster 100% less servers

    Create groundbreaking applications without needing to run your own data server, build indexing infrastructure, or parse through raw data.

  • Spend less 60-98% less per month

    Cut down on costs and time spent running expensive infrastructure by tapping into The Graph’s competitive data market.

  • Increase resilience 99.99%+ uptime

    Ensure your application’s uptime and keep its data flowing 24/7 with a globally distributed network of contributors.

What is GraphQL

  1. Site: https://graphql.org/

  2. Example:

    1. query UniswapV3 data
    2. query UniswapV3
    3. uniswap-v2-dev

  3. call GraphQL: https://graphql.org/graphql-js/graphql-clients/

fetch("/graphql", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Accept: "application/json",
  },
  body: JSON.stringify({ query: "{ hello }" }),
})
  .then(r => r.json())
  .then(data => console.log("data returned:", data))

Deploy a subgraph

https://thegraph.com/docs/en/developing/creating-a-subgraph/

Public RPC Node: https://ethereum-sepolia.publicnode.com

  1. Deploy Contract
  2. Get ABI
  3. Create Subgraph project
  4. Graph init
  5. Graph codegen & graph build. & grpah deploy
    1. Example: https://api.studio.thegraph.com/proxy/64062/mybank/v0.0.3/graphql
    2. Contract Address: 0x3FD542687000843F7B1d79945E8D1b7B44c09FD1
  6. Add new contract (grpah add )
  7. Query: call by http (GraphQL)