Ethereum: Viem’s Publicclient#WatchContractevent with WSS Transport: Socket closed
As programmers, we all want to make sure that our applications based on Ethereum worked efficiently and safely. Recently, I encountered a problem with the “PublicClient#WatchContractaCtevent” method in my application, which led me to further examination.
The problem lies in the way we configured WebSocket (WSS) transport when creating a new publicclient instance. In particular, when using WebSockets, if the customer is not created or used for a long time between application startups, this can lead to problems with closing the nest.
problem
Here’s what happened:
- I created two “PublicClient” instances with the same options (e.g. the same address and portfolio network).
- Then I connected one instance to the WebSocket ending point using WSS transport.
- Later, when my application became inactive for several hours or even days, no customer was able to connect to the WebSocket server.
Solution
To solve this problem, you need to make sure that both PublicClient instances are created with the same options and used simultaneously before the introduction of the extended period of inaction. Here’s how you can modify your code to achieve this:
- Create both “PublicClient” instances using the same options:
`Javascript
const publicclient1 = new publicclient ({{
... options1,
// the same portfolio address as options1
});
const publicclient2 = new publicclient ({{
... options2,
// the same portfolio address as options2
});
- Use both customers simultaneously before entering in a longer period of inactivity:
`Javascript
Setinterval (() => {
publicclient1.connect ();
publicclient2.connect ();
// Continue the logic of the application here ...
}, 10,000); // Connect every 10 seconds for a short time
// When you are ready to disconnect, call "disconnect" at one or both customers.
Settimeout (() => {
publicclient1.disconnect ();
publicclient2.disconnect ();
}, 60000); // disconnect after 60 seconds
Additional recommendations
To further optimize the application performance and reduce the problems with closing the nests:
- Consider the use of a more solid WebSocket library, which provides better error service and connecting management, such as “WS` or” Websocket-Client “.
- Implementation of a more advanced survey mechanism for detection when the customer is no longer connected. You can use libraries such as “Connect-Socket-Poller” to create a custom Beller.
- Cleanly clean the outdated connections, periodically disconnecting disconnected customers.
By following these recommendations, you should be able to solve the problem using the “PublicClient#WatchContRATAVENT” method and make sure that the Ethereum -based applications work efficiently and safely.