Fix ws

[dvovk]

This pull request includes several updates to the WebSocket handling in the api/websocket_handler.go file and a minor dependency update in the go.mod file. The most important changes focus on improving the WebSocket connection management and handling.

Improvements to WebSocket handling:

• api/websocket_handler.go: Added a closed field to the WebsocketHandler struct to track the connection state and prevent multiple closures.
• api/websocket_handler.go: Updated the closeConnection method to use a mutex lock for thread-safe operation and to check if the connection is already closed before proceeding.
• api/websocket_handler.go: Modified the HandleWebSocket method to close the connection gracefully when the request context is done or the channel is closed.
• api/websocket_handler.go: Added error handling for normal and unexpected WebSocket closures in the message reading loop.

Dependency update:

• go.mod: Updated the erigontech/erigonwatch dependency from version v0.1.24 to v0.1.26.

[Copilot]

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

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api/websocket_handler.go:174

• [nitpick] Instead of simply printing a message and breaking out of the loop when a normal or unexpected closure occurs, consider invoking closeConnection() to update the handler’s state and gracefully clean up resources.

if websocket.IsCloseError(err, websocket.CloseNormalClosure) {