How to Connect infuraWebsocket and subsribe perticular event in swift?

[Ashish8460]

No description provided.

[Ashish8460]

pls give me example how to connect infura websocket and how to subscribe own event and get data from url in swift4 ? very crititcal and confusing

[BaldyAsh]

Hi, @Ashish8460 . You can start at https://github.com/matter-labs/web3swift/blob/master/Documentation/Usage.md#websockets.
And for complete understanding https://infura.io/docs/ethereum/wss/introduction.
Think you need something like that:

class DelegateClass: Web3SocketDelegate {
	var socketProvider: InfuraWebsocketProvider? = nil // Infura WebSocket Provider
	
	// Protocol method, here will be messages, received from WebSocket server
	func received(message: Any) {
        	// Make something with message
    	}

         func some() {
                 // Connecting to mainnet Infura wss endpoint
                 socketProvider = InfuraWebsocketProvider.connectToInfuraSocket(.Mainnet, delegate: self)
                 // Subscribing your events
                 try! socketProvider.subscribeOnLogs(addresses: [Addresses of your contracts], topics: [Topics of your logs])
         }
}

[Ashish8460]

try! socketProvider.subscribeOnLogs(addresses: [Addresses of your contracts], topics: [Topics of your logs])

// I can't get this method in infuraWebSocketProvider.
what parameters should be pass and how to make encodable them.

[Ashish8460]

On May 13, 2019, at 6:38 AM, Anton Grigorev ***@***.***> wrote: Hi, @Ashish8460 <https://github.com/Ashish8460> . You can start at https://github.com/matter-labs/web3swift/blob/master/Documentation/Usage.md#websockets <https://github.com/matter-labs/web3swift/blob/master/Documentation/Usage.md#websockets>. And for complete understanding https://infura.io/docs/ethereum/wss/introduction <https://infura.io/docs/ethereum/wss/introduction>. Think you need something like that: class DelegateClass: Web3SocketDelegate { var socketProvider: InfuraWebsocketProvider? = nil // Infura WebSocket Provider // Protocol method, here will be messages, received from WebSocket server func received(message: Any) { // Make something with message } func some() { // Connecting to mainnet Infura wss endpoint socketProvider = InfuraWebsocketProvider.connectToInfuraSocket(.Mainnet, delegate: self) // Subscribing your events try! socketProvider.subscribeOnLogs(addresses: [Addresses of your contracts], topics: [Topics of your logs]) } }

- I don’t get socketProvider.subscribeOnLogs(addresses: [Addresses of your contracts], topics: [Topics of your logs]). In my project - can you give me example of it how to pass parameters and subscribe event urgent!

[BaldyAsh]

@Ashish8460 hi, sorry, was on my vacation without stable wifi. Is the problem relevant? I use subscribeOnLogs as I've written in the example above without any troubles.
For example subscribing on Dai contract Transfer(address,address,uint256) event:

try! self.socketProvider!.subscribeOnLogs(addresses: [EthereumAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359")!], topics: ["ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"])

[baquedano]

I know this is an old thread but someone might find it useful, I was having troubles trying to connect through subscribe to logs using websockets and even the example given here was not working for me, maybe there was a change on how infura processes the request but it seems that now topics must be prefixed by '0x' in order for subscriptions to work.

[amirhossein7]

@Ashish8460 hi, sorry, was on my vacation without stable wifi. Is the problem relevant? I use subscribeOnLogs as I've written in the example above without any troubles.
For example subscribing on Dai contract Transfer(address,address,uint256) event:

try! self.socketProvider!.subscribeOnLogs(addresses: [EthereumAddress("0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359")!], topics: ["ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"])

this method is not working for me