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- 1. Making the world’sdecentralised data more accessible. SubQuery 201 Workshop - Intermediate 1
- 2. 2 Agenda ● Introduction ● Basicconcepts (manifest file, schema, mappings) ● Build another simple project ● SubQuery Projects ● Summary ● Q&A
- 3. Problems Query Speed Parachain Diversity Itcan take days to query simple chain data from Polkadot Today, each parachain requires its own indexing and data service
- 4. Problem: Query Speed Inorder to build increasingly complex and intuitive applications, developers need powerful tools to process and query their data faster. It can take days to query simple chain data from Polkadot
- 5. Problem: Polkadot ParachainDiversity darwinia.js DAPP SDK PROTOCOL polkadot.js acala.js What does Alice have in her wallet? Scenario: account balance across chains 200 RING on Darwinia 100 DOT on Polkadot 50 ACA on Acala Too many protocols / smart contract engine etc Current flow Today, each parachain requires its own indexing and data service
- 6. SubQuery is anopen source project that allows developers to index, transform, and query Substrate chain data to power their applications. Think of it like the Google for blockchain What is SubQuery?
- 7. Node.js (NPM) npm install-g @subql/cli Yarn (optional) Docker What is needed?
- 8. SubQuery Components Extract Filter andextract real time chain data 3 1 2 Transform Transform and aggregate chain data to your need Persist Save data to high performance database Query Quickly query your dataset using complex GraphQL syntax in your dApps 4 Web Apps Webhooks (e.g.IFTTT) Data for other Blockchains Mobile Apps
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- 10. The SubQuery Projectin a Nutshell A SubQuery project is a set of instructions on how to index data. It has the following three main parts ● GraphQL Schema File - the shape of your data ● Manifest File - the configuration ● Mapping Files - data transformation pipelines
- 11. Handler Types There arethree mapping types: Event: balances.deposit Event: balances.deposit Call: timestamp.set Call: timestamp.set ● Block Handler - each and every block ● Event Handler - each new (filtered) event ● Call Handler - each new (filtered) call Event: balances.deposit
- 12. Manifest file A configurationfile that: ● Defines the details of how SubQuery will index and transform the chain data. ● project.yaml https://doc.subquery.network/create/manifest.html
- 13. GraphQL Schema ● Thisfile dictates the shape of your data from SubQuery ● schema.graphql ● Any changes to this file requires a “regeneration” via yarn codegen or npm run-script codegen
- 14. Mappings ● Defines howthe chain data is transformed into the optimised GraphQL entities ● Sit in src/mappings directory ● Referenced in project.yaml under mapping handlers
- 15. Mapping filters ● Useto decide what block, event, or extrinsic will trigger a mapping handler. ● Are optional but recommended. ● Will improve indexing performance.
- 16. Custom chains ● SubQueryworks with any Substrate based chain! ● Just import your custom types in the project.yaml file and adjust the mapping functions.
- 17. Let’s build a projecttogether! SubQuery Network
- 18. Hands on exercise ●SubQuery Transfers ● Define the shape of our data (schema.graphql) ● Update the our handlers in the manifest file (project.yaml) ● Update the mappings file (mappingHandlers.ts) Open the SubQuery 201 Lab Workbook and follow along!
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- 20. SubQuery Projects https://project.subquery.network/ https://doc.subquery.network/publish /publish.html ● Productiongrade infrastructure is provided ● Scaleable, reliable, high performing ● Free to host
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- 22. Summary ● Index, transform,and query Substrate chain data ● Manifest, Graphql schema, mappings file ● Hands on exercise ● SubQuery Projects
- 23. Follow us on Telegram| Twitter | Linkedin | Medium | GitHub | Matrix: #subquery:matrix.org Website www.subquery.network Find Out More