Customize your Substrate chain CLI using StructOpt | Substrate Seminar

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Parity Tech

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Published on April 22, 2020 12:39:07 PM ● Video Link: https://www.youtube.com/watch?v=IVifko1fqjw

Duration: 1:14:53

455 views

9

This week Cecile Tonglet explores how Substrate uses the Stuct Opt library to build an extensible CLI interface.

0:00 What is StructOpt
3:35 Example of using StructOpt
9:48 How Substrate's uses structOpt
12:23 Defining a Substrate Node CLI
22:00 Example adding a subcommand
28:08 Parsing complex parameters
31:08 Non Exhaustive Structs (https://github.com/rust-lang/rust/pull/64639/)
33:12 Wiring additional parameters tog the service
36:50 The SubstrateCLI Trait
44:13 Live Coding another new parameter
55:28 Overriding default values for built-in flags
1:04:30 Adding a new subcommand
1:11:28 Polkadot's CLI

Links from the Seminar
UTXO node we hacked - https://github.com/substrate-developer-hub/utxo-workshop/
Structopt docs - https://docs.rs/structopt/0.3.13/structopt/
cargo watch - https://github.com/passcod/cargo-watch

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