Jaco Greeff
c7c76f6edb
* Rework uniqTypes without duplication * Extra info for vX -> v7 conversion * Add vX to naming * Rework unwrap return * Ignore gathering unique for v0 * Fix getUniq for V0 (well, def. throw-away, but anyway...) * compareMap cleanup * Cleanup author extraction * Add modules via Struct.with (Metadata) * Revert "Add modules via Struct.with (Metadata)" This reverts commit 0666c3014cf840fb4ab26a5231cdf67dbe977bd7. * Consistency in injected vs defined classes (Metadata) * Add isTrue/isFalse to Bool * Meta PlainType/MapType in registry * Fix wrong v6 imports * Extract storage modifier * Split additional Metadata classes into interfaces * Minor cleanups in type naming * Static json renames * Convert most V0 classes to interfaces * Additional meta classes to interfaces * No classes for Metadata V0 & V1 anymore * Rename json imports * Base cleanups * Add polkadot static
@polkadot/rpc-core
This library provides a clean wrapper around all the methods exposed by a Polkadot network client.
Usage
Installation -
yarn add @polkadot/rpc-core
Initialisation -
import Rpc from '@polkadot/rpc-core';
import WsProvider from '@polkadot/rpc-provider/ws';
const provider = new WsProvider('http://127.0.0.1:9944');
const rpc = new Rpc(provider);
Retrieving the block header object for a given block header hash (a 0x-prefixed hex string with length of 64) -
rpc.chain
.getHeader('0x1234567890')
.subscribe(
(header) => console.log(header),
(error) => console.error('error:', error)
);
Retrieving the best block number, parent hash, state root hash, extrinsics root hash, and digest (once-off) -
rpc.chain
.getHead()
.pipe(
switchMap((headerHash) => {
return rpc.chain.getHeader(headerHash);
})
)
.subscribe(
(header) => {
console.log(`best #${header.blockNumber.toString()}`);
console.log(`parentHash: ${header.parentHash.toString()}`);
console.log(`stateRoot: ${header.stateRoot.toString()}`);
console.log(`extrinsicsRoot: ${header.extrinsicsRoot.toString()}`);
console.log(`digest: ${header.digest.toString()}`);
},
(error) => {
console.error('error:', error);
}
);
Retrieving best header via subscription -
api.chain
rpc
.subscribeNewHead()
.subscribe(
(header) => {
console.log(`best #${header.blockNumber}`);
},
(error) => {
console.error('error subscribing:', error);
}
);