Can't connect successfully to Polkadot node

[0x-r4bbit]

Please let me know if this is rather an issue with Polkadot as opposed to polkadot.js and if I should report this somewhere else.

I've installed polkadot from its git repository and spinned up a node via

$ polkadot --dev

Next I wanted to try to connect to it via polkadot.js, so I took the "Simple Connect" example and ran it against my local node:

const { ApiPromise, WsProvider } = require('@polkadot/api');

async function main() {
  const provider = new WsProvider('ws://127.0.0.1:9944');
  const api = await ApiPromise.create(provider);

  const [chain, nodeName, nodeVersion] = await Promise.all([
    api.rpc.system.chain(),
    api.rpc.system.name(),
    api.rpc.system.version()
  ]);

  console.log(`Connected to: ${chain} using ${nodeName} v${nodeVersion}`);
}

main().catch(console.error).finally(() => process.exit());

^ This is polkadot/api v^0.8.1 and polkadot version latest HEAD from master which at the time of creating this issue was 12cb9cb5.

Running this script gives me the following error:

2019-07-16 15:23:34        RPC-CORE: getMetadata (block: Hash): Metadata:: U8a: failed on 'MagicNumber':: U8a: failed on 'MetadataEnum':: Unable to create Enum via index 6, in
MetadataV0, MetadataV1, MetadataV2, MetadataV3, MetadataV4, MetadataV5
2019-07-16 15:23:34   API/DECORATOR: Error: FATAL: Unable to initialize the API: getMetadata (block: Hash): Metadata:: U8a: failed on 'MagicNumber':: U8a: failed on 'MetadataEnum':: Unable to create Enum via index 6, in MetadataV0, MetadataV1, MetadataV2, MetadataV3, MetadataV4, MetadataV5                                                             
    at EventEmitter._rpcBase._provider.on (/Users/pascalprecht/projects/embark/polkadot-playground/node_modules/@polkadot/api/Base.js:433:23)                                  
    at process._tickCallback (internal/process/next_tick.js:68:7)

Any idea what I need to do?

Also, I've noticed that simply installing @polkadot/api won't do it as it needs bs58 to run as well. I needed to install it explicitly, maybe it should come as a (peer)dependency of polkadot/api.

[jacogr]

If you are using the master versions (which are unreleased), you need to use the master branch of the API - there are published as -beta versions to npm. Current is 0.82.0-beta.63 (that goes for both Polkadot and Substrate master branches - these are in heavy development and the API does not release a new "stable" version daily, which is more-or-less what is required to keep up)

Easiest is yarn install @polkadot/api@beta (to grab the beta tag)

As any PR is merged into master here, a version -beta is published to npm. (This is the version we use in polkadot-js/apps, ensuring that we have support for both the 1.x substrate, 0.4 polkadot, master substrate, master polkadot versions)

[jacogr]

PS: The bs58 issue is fixed in 0.82-beta (it was an upstream issue with the @polkadot/util-crypto packages)

[0x-r4bbit]

Wonderful, thanks for clarifying this @jacogr ! I'll give the beta version a spin.

And just to add to this, I tried running polkadot POC-04 first, but that version didn't even compile, so I went with latest master.

[0x-r4bbit]

This has worked well, thank you!

[polkadot-js-bot]

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