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https://github.com/sodazone/ocelloids-sdk

Polkadot and Substrate Typescript SDK
https://github.com/sodazone/ocelloids-sdk

monitoring polkadot substrate

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Polkadot and Substrate Typescript SDK

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README 

        



  



[Packages](https://github.com/sodazone/ocelloids-sdk/#installation) | [Documentation](https://sodazone.github.io/ocelloids-sdk/) | [Examples](https://github.com/sodazone/ocelloids-sdk/tree/main/examples)





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  License






---



Ocelloids[^1] SDK is an open-source software development kit written in Typescript for Polkadot and Substrate based networks.

It simplifies the implementation of multi-chain programs and provides domain-specific logic for different pallets.



## Features



* **Composable Reactive Streams** — Easily filter blockchain data and react to occurrences of interest using composable reactive streams.

* **Data Sources** — Retrieve data from extrinsics, blocks, events and storage.

* **Powerful Query Operators** — Filter data using integrated operators that support complex queries in the Mongo query language. Includes support for big numbers and advanced features such as dynamic queries.

* **Flexible Type Conversions** — Seamlessly convert data into a terse queryable format.

* **Extended Context Types** — Extend base generic events and extrinsics with contextual information such as block number, block position and extrinsic position.

* **Nested Calls Extraction** — Supports recursive flattening with event correlation of nested utility (i.e. batch calls), multisig and proxy calls within an extrinsic.

* **Multi-Chain Support** — Interact with multiple networks.

* **Pallet-Specific Modules** — Modules designed to handle use cases related to a particular pallet, such as tracking calls and events from the contracts pallet.



## Quickstart



Check our [Quickstart Guide](https://github.com/sodazone/ocelloids-sdk/blob/main/guides/QUICKSTART.md) to set up your first Ocelloids program.



## Installation



### Ocelloids Core





  npm @sodazone/ocelloids-sdk




```shell

npm i @sodazone/ocelloids-sdk

```



Provides essential abstractions, reactive operators, base type converters, and pallet-independent functionality.



Source code [packages/core](https://github.com/sodazone/ocelloids/tree/main/packages/core).



### Ocelloids Contracts





  npm @sodazone/ocelloids-sdk-contracts




```shell

npm i @sodazone/ocelloids-sdk-contracts

```



Provides operators and type converters for the contracts pallet.



Source code [packages/pallets/contracts](https://github.com/sodazone/ocelloids-sdk/tree/main/packages/pallets/contracts).



## Usage



Refer to the [SDK documentation](https://sodazone.github.io/ocelloids-sdk/).



You can also explore some example applications in the [examples/](https://github.com/sodazone/ocelloids-sdk/tree/main/examples) folder.



### Example: Filtering Transfer Events



Here's a basic usage example that filters balance transfer events from finalized blocks above a certain amount:



```typescript

import { WsProvider } from '@polkadot/api';



import {

  SubstrateApis,

  finalizedBlocks,

  filterEvents

} from '@sodazone/ocelloids-sdk';



const apis = new SubstrateApis({

  polkadot: {

    provider: new WsProvider('wss://rpc.polkadot.io')

  }

});



apis.rx.polkadot.pipe(

  finalizedBlocks(),

  filterEvents({

    section: 'balances',

    method: 'Transfer',

    'data.amount': { $bn_gte: '50000000000' }

  })

).subscribe(

  x => console.log(x.toHuman())

);

```



Extended event output - click to expand



Extended event output with contextual information:



```javascript

{

  eventId: '16134479-5-1',

  extrinsicId: '16134479-5',

  extrinsicPosition: 1,

  blockNumber: '16,134,479',

  method: 'Transfer',

  section: 'balances',

  index: '0x0502',

  data: {

    from: '14GuP6QAfK9uwo3MQ9LrcmEqttcrtoNfDaSHn2BVaYcJJBg6',

    to: '12But7r26e2UwZkSYC8bU5nQdyfqWXswZEwS1tbH9nD8CXvK',

    amount: '54,719,854,400'

  }

}

```



The event identifier `eventId` consists of the block number, the position of the extrinsic within the block,

and the position of the event within the extrinsic.



Filter events operator details - click to expand



The `filterEvents` operator used in the example is composed of the following stack:



```typescript

source.pipe(

  // Extracts extrinsics with events

  extractTxWithEvents(),

  

  // Flattens and correlates events for nested 

  // batch, multisig, proxy and derivative calls

  flattenCalls(),

  

  // Filters at the extrinsic level

  // mainly for success or failure

  mongoFilter(extrinsicsCriteria),

  

  // Maps the events with

  // block and extrinsic context

  extractEventsWithTx(),

  

  // Filters over the events

  mongoFilter(eventsQuery),

  

  // Share multicast

  share()

)

```



### Example: Account Balance



Here's an example that monitors the balance of an account with an amount threshold condition:



```typescript

import { WsProvider } from '@polkadot/api';

import { switchMap } from 'rxjs';



import {

  SubstrateApis,

  mongoFilter

} from '@sodazone/ocelloids-sdk';



const apis = new SubstrateApis({

  polkadot: {

    provider: new WsProvider('wss://rpc.polkadot.io')

  }

});



apis.query.polkadot.pipe(

  switchMap(q => q.system.account(

    '15QFBQY6TF6Abr6vA1r6opRh6RbRSMWgBC1PcCMDDzRSEXf5'

  )),

  mongoFilter({

    'data.free': { $bn_lt: '6038009840776279' }

  })

).subscribe(x => console.log('Account Balance:', x.toHuman()));

```



### Example: Dynamic Query



Now, let's explore a dynamic query example that collects and monitors balance transfer events for a set of addresses, starting from ALICE's address:



Dynamic query example - click to expand



```typescript

import { WsProvider } from '@polkadot/api';

import '@polkadot/api-augment';



import {

  SubstrateApis,

  blocksInRange,

  filterEvents,

  ControlQuery

} from '@sodazone/ocelloids-sdk';



function transfersOf(addresses: string[]) {

  return ControlQuery.from({

    $and: [

      { section: 'balances' },

      { method: 'Transfer' },

      {

        $or: [

          { 'data.from': { $in: addresses } },

          { 'data.to': { $in: addresses } }

        ]

      }

    ]

  });

}



const apis = new SubstrateApis({

  polkadot: {

    provider: new WsProvider('wss://rpc.polkadot.io')

  }

});



const seenAddresses = new Set([ALICE]);

let dynamicQuery = transfersOf([...seenAddresses]);



apis.rx.polkadot.pipe(

  blocksInRange(16134439, 100),

  filterEvents(dynamicQuery)

).subscribe(event => {

  console.log('Event: ', event.toHuman());



  if (apis.promise.polkadot.events.balances.Transfer.is(event) ) {

    const transfer = event.data;

    const from = transfer.from.toPrimitive();

    const to = transfer.to.toPrimitive();



    seenAddresses.add(from);

    seenAddresses.add(to);



    // Updates dynamic query, probably you want

    // to update it only for new seen addresses

    dynamicQuery.change(transfersOf([...seenAddresses]));

  }

});

```



This example introduces the concept of a dynamic query. As new addresses are encountered, the dynamic query is updated with the newly seen addresses by calling `dynamicQuery.change()`. This ensures that future events will be filtered based on the updated set of addresses.



## Development



### Requirements



To contribute to the development of Ocelloids, ensure that you have the following requirements installed:



* [Node.js](https://nodejs.org/en/) >=18.14

* [yarn](https://yarnpkg.com/getting-started/install) >=3.x.x



### Install



To set up the development environment, follow these steps:



1. Install the latest LTS version of [Node.js](https://nodejs.org/en/).



2. Enable [Corepack](https://github.com/nodejs/corepack#how-to-install) at the root of the project:



```shell

corepack enable

```

3. Install dependencies:



```shell

yarn install

```

4. Build Ocelloids libraries:



```shell

yarn build

```



### Project Layout



The Ocelloids repository utilizes workspaces for modularization.



The repository contains three main folders: `packages`, `examples` and `tools`.



#### Packages



The `packages` folder contains the Ocelloids SDK implementation, which is further divided into `core`, `pallets`, and `test` modules.



#### Tools



The development support tools include functionalities such as chain data capture to assist in the development of the SDK.



#### Examples



The [examples/](https://github.com/sodazone/ocelloids-sdk/tree/main/examples) folder contains example applications.



### Testing



To run unit tests, use the following command:



```shell

yarn test

```



Additional test data and mocks are available in `packages/test/` for your convenience. If necessary, you can capture specific data using the development support tools located in `tools/` for testing purposes.



### Troubleshooting



#### Visual Studio Code



If you encounter the issue of `@sodazone/ocelloids-sdk-test` being marked as unresolved 

in the `spec` test files after building the project, you can resolve it by following these steps:



* Open any typescript file of the project.

* Run the command "TypeScript: Reload project" to reload the TypeScript project configuration.



For further assistance or troubleshooting, please consult the project's documentation or reach out to the Ocelloids community.



[^1]: Noun ocelloid (_plural_ ocelloids): “(microbiology) a cellular structure found in unicellular microorganisms that is analogous in structure and function to eyes, which focus, process and detect light.”