capi
v0.1.1-beta.1
Published
Capi is a framework for crafting interactions with Substrate chains
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Capi
Capi is a framework for crafting interactions with Substrate chains. It consists of a development server and fluent API, which facilitates multichain interactions without compromising either performance or ease of use.
- Manual →Guides to get up and running
- Examples →SHOW ME THE CODE
- API Reference →A generated API reference, based on type signatures and TSDocs.
Installation
npm i capi
Note: The minimum supported Node version is 20, as we require the Web Crypto API be accessible from
globalThis.crypto
for the sake of browser compatibility.
import_map.json
{
"imports": {
"capi": "https://deno.land/x/capi/mod.ts",
"capi/nets": "https://deno.land/x/capi/nets/mod.ts"
}
}
Note: For now, we only support the latest 1.x version of Deno.
Configuration
Create a nets.ts
and specify the chains with which you'd like to interact.
import { bins, net } from "capi/nets"
const bin = bins({ polkadot: ["polkadot", "v0.9.38"] })
// A Polkadot development network
export const polkadotDev = net.dev({
bin: bin.polkadot,
chain: "polkadot-dev",
})
// The Polkadot relay chain
export const polkadot = net.ws({
url: "wss://rpc.polkadot.io/",
targets: { dev: polkadotDev },
})
Command Line Tool
In this documentation, we use Capi's CLI via the alias "capi", instead of via its full path:
./node_modules/.bin/capi
deno run -A https://deno.land/x/capi/main.ts
Codegen Chain-specific APIs
capi sync node
capi sync deno
At a Glance
Retrieve the first 10 entries from a storage map of Polkadot.
import { polkadot } from "@capi/polkadot"
const accounts = await polkadot.System.Account.entries({ limit: 10 }).run()
Development Networks
During development, we may want to swap out the underlying connection with that
of a devnet. This can be achieved via targets — by specifying alternate targets
in your nets.ts
file, you can switch to them by wrapping your command with
capi serve --target someTarget --
. For example:
capi serve --target dev -- node main.js
Other examples:
capi serve --target dev -- npm run start
capi serve --target dev -- deno run -A ./main.ts
Running Examples
Within a fresh clone of this repository...
deno task sync # only needed once
deno task run examples/<example_path>
Or, to run an example with Node:
deno task sync # only needed once
deno task dnt --examples # only needed once
deno task capi serve -- node target/npm/capi-examples/esm/examples/<example_path>
Rationale
In a likely future of specialized, interoperable chains, developers will need to make use of on-chain programs to satisfy varying use cases; the expertise required to interact with these on-chain programs is currently greater than that which should be expected of app developers. Does this mean that app developers must forgo integrating with this blossoming infrastructure? We think not; the open source community can use Capi to abstract over the atomics of the on-chain world. An interaction spanning several chains and dozens of methods can be described with a single Rune[^1].
As you read through this documentation, please consider use cases over which you might like to abstract; if you wish to add your use case to Capi's standard library, please submit an issue.
Code of Conduct
Everyone interacting in this repo is expected to follow the code of conduct.
Contributing
Contributions are welcome and appreciated! Check out the contributing guide before you dive in.
License
Capi is Apache licensed.
[^1]: Rune is the unit of composition with which we model Capi programs.