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With the Javascript SDK, developers can harness the power of Sentinel's decentralized network infrastructure to create secure and private communication solutions seamlessly within their JavaScript-based projects.

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sentinel-js-sdk

The Sentinel JS SDK relays on CosmJS and it was developed following the official tutorial, it take also inspiration from other open source Cosmos SDK.

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The SDK exstends the followings:

Full documentation: https://sentinel-official.github.io/sentinel-js-sdk/

clients

import { SentinelClient } from "@sentinel-official/sentinel-js-sdk";

const rpc = "https://rpc.sentinel.co:443"
const client = await SentinelClient.connect(rpc)

If you need to sign and broadcast a tx you need to instantiate a SigningClient.

import { SigningSentinelClient } from "@sentinel-official/sentinel-js-sdk";
import { DirectSecp256k1HdWallet } from "@cosmjs/proto-signing"
import { GasPrice } from "@cosmjs/stargate"

const wallet = await DirectSecp256k1HdWallet.fromMnemonic(mnemonic, { prefix: "sent" });
const [account] = await wallet.getAccounts();

const rpc = "https://rpc.sentinel.co:443"

// With a default GasPrice:
const customDenom = "udvpn"
const gasPrice = GasPrice.fromString(`0.2${customDenom}`);
const client = await SigningSentinelClient.connectWithSigner(rpc, wallet, {
    gasPrice: gasPrice
})

// Without a default GasPrice:
const client = await SigningSentinelClient.connectWithSigner(rpc, wallet)

You can also set other default parameters: https://cosmos.github.io/cosmjs/latest/stargate/interfaces/SigningStargateClientOptions.html.

In order to subscribe to chain events you need a websocket client

import { SentinelWsClient } from "@sentinel-official/sentinel-js-sdk";
const client = new SentinelWsClient("wss://rpc.sentinel.quokkastake.io");
const stream = client.subscribe("tm.event='NewBlock'")
stream.addListener({
    next: data => console.log(data),
    error: err => console.error(err),
    complete: () => console.log('completed'),
});

query

import { Status, PageRequest } from "@sentinel-official/sentinel-js-sdk";
const nodes = await client.sentinelQuery?.node.nodes(
    Status.STATUS_ACTIVE,
    PageRequest.fromPartial({
        limit: 5,
        countTotal: true
    })
)

For pagination please follow:

transaction

After you have initialize a SigningClient you can prepare and broadcast a tx in multiple ways.

  1. Create a MsgEcodeObject and call signAndBroadcast from your client.
import { TxNodeSubscribe, nodeSubscribe } from "@sentinel-official/sentinel-js-sdk";
import Long from "long";

const args: TxNodeSubscribe = {
    from: account.address,
    nodeAddress: sentnode,
    gigabytes: Long.fromNumber(gygabyte, true),
    denom: "udvpn"
}
const msg = nodeSubscribe(args)
const tx = client.signAndBroadcast(account.address, [msg], "auto", "memo")
  1. Call directly nodeSubscribe from your client or from submodule (this will automatically signAndBroadcast the tx)
import { TxNodeSubscribe } from "@sentinel-official/sentinel-js-sdk";
import Long from "long";

const args: TxNodeSubscribe = {
    from: account.address,
    nodeAddress: sentnode,
    gigabytes: Long.fromNumber(gygabyte, true),
    denom: "udvpn",
    fee: "auto",
    memo: "hello from js-sdk"
}
// call directly
const tx1 = client.nodeSubscribe(args)
// use submodule
const tx2 = client.node.subscribe(args)

It is up to you if you want to await the tx or use a callback

const tx1 = await client.nodeSubscribe(args)
client.nodeSubscribe(args).then(tx => { do stuff... })

events parsing

client.signAndBroadcast or implicit call trought, for example, client.nodeSubscribe or client.node.subscribe return a DeliverTxResponse. You can search for a determinate event using the method searchEvent. For example if you are looking for sentinel.node.v2.EventCreateSubscription, you can do the following:

import { searchEvent } from "@sentinel-official/sentinel-js-sdk";
const eventCreateSubscription = searchEvent(sentinel.node.v2.EventCreateSubscription, tx.events);

or better

import { searchEvent } from "@sentinel-official/sentinel-js-sdk";
import { NodeEventCreateSubscription } from "@sentinel-official/sentinel-js-sdk";
const eventCreateSubscription = searchEvent(NodeEventCreateSubscription.type, tx.events);

The single event can also be parsed via the appropriate interface, following the example:

import { searchEvent } from "@sentinel-official/sentinel-js-sdk";
import { NodeEventCreateSubscription, isNodeEventCreateSubscription } from "@sentinel-official/sentinel-js-sdk";

const eventCreateSubscription = searchEvent(NodeEventCreateSubscription.type, tx.events);
if(eventCreateSubscription && isNodeEventCreateSubscription(eventCreateSubscription)) {
    const eventParsed = NodeEventCreateSubscription.parse(eventCreateSubscription)
    console.log(`Your subscription id is: ${eventParsed.value.id}`)
} else console.log("eventCreateSubscription, not found")

protobuf

All the .proto files are compiled using protoc and ts-proto as plugin. The compiled .ts proto files are under src/protobuf. If you want to compile again you can use scripts/generate-proto.sh. The script requires git and protoc, it will automatically download all the .proto definitions from sentinel-hub and relative third parties.

examples

The official cosmjs examples can be used as well. Just remember to replace StargateClient with SentinelClient and SigningStargateClient with SigningSentinelClient.

The repository provide currently a nodejs script example and a keplr one (based on: https://tutorials.cosmos.network/tutorials/7-cosmjs/4-with-keplr.html).

If you want to use a local version of sdk (for testing purpose) you have to compile the src folder into dist and then link the package with npm.

npm run build
npm link
cd examples/<choose-an-example>
npm link @sentinel-official/sentinel-js-sdk

run keplr example

cd examples/keplr
npm i
npm run dev

Navigate to: http://127.0.0.1:3000/.

run nodejs example

cd examples/node
npm i
ts-node main.ts

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With the Javascript SDK, developers can harness the power of Sentinel's decentralized network infrastructure to create secure and private communication solutions seamlessly within their JavaScript-based projects.

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