Polkalert API Explorer and Wasm Smart Contracts | Substrate Seminar | Archives

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Parity Tech

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Published on January 25, 2020 7:12:42 PM ● Video Link: https://www.youtube.com/watch?v=b3HIXufMHnc

Duration: 1:35:38

312 views

9

This week we explore Parity's Contracts pallet for running wasm smart contracts. But first we see a demo of Polkalert's API Explorer for Substrate-based blockchain

00:24 API Explorer - Motivation and Demo
10:05 API Explorer - Design Overview
15:11 Shoutout to Polkabot
18:25 Questions about contracts
21:40 Architecture Overview of Contracts stack
27:24 Contracts Pallet Code Overview
29:55 Storage Rent Concepts
34:34 Contracts Pallet's `Call` function
37:34 Setup for today's Demo
42:45 Contract Metadata Example
46:47 Code Overview - Calling a contract from the runtime
49:45 Code Overview - Reading contract storage from the runtime
51:33 Question: Runtime calling contract VS contract calling runtime
1:00:13 Code Overview - Reading runtime storage from a contract
1:05:47 Returning values from contract methods
1:09:03 Starting the Demo
1:21:03 Demo Contract is (accidentally) tombstoned
1:28:19 Conceptual discussion about restoring tombstoned contracts


Links from today's show:

API Explorer: https://apiexplorer.polkalert.com/
Cargo Contract https://github.com/paritytech/cargo-contract
Ricardo's Demo Code https://github.com/riusricardo/substrate-runtime-contract-sample
Polkadot-js API derive doc: https://polkadot.js.org/api/start/api.rpc.html#detour-into-derives