EIP-2786: Ethereum Provider Connect/Disconnect Events
Simple Summary
When an Ethereum Provider becomes connected or disconnected, it will emit a connect
/disconnect
event.
Abstract
The Provider is said to be “connected” when it can service RPC requests to at least one chain.
The Provider is said to be “disconnected” when it cannot service RPC requests to any chain at all.
When the Provider switches from a "connected" state to a "disconnected" state, it will emit a connect
event.
When the Provider switches from a "disconnected" state to a "connected" state, it will emit a disconnect
event.
Motivation
When an application is hooked up to an Ethereum provider, there is value in having the application be alerted of connect/disconnect events that may occur so the application can appropriately inform the user of the situation. It is left up to the application to decide whether to listen in on these events, and how to handle them.
Specification
Definitions
Connected
The Provider is considered connected
when it is able to service RPC requests to at least one chain.
Disconnected
The Provider is considered disconnected
when it is unable to service RPC requests to any chain.
Events
connect
The Provider MUST emit a connect
event to all attached EIP-2700 listeners if it transitions from a disconnected
state to a connected
state.
All attached listeners MUST be called with the parameter { chainId }
.
chainId
MUST specify the integer ID of the connected chain encoded as a hexadecimal string.
If the Provider supports the eth_chainId
JSON-RPC method or a derivation of it, then the chainId
MUST match the return value of eth_chainId
.
The Provider MAY call the attached listeners in any order.
Rationale
This EIP is mostly a retrospective EIP meaning it codifies an already existing specification so there isn’t a lot of room for improving things such as by having a connect/disconnect event per chain.
Security Considerations
The relationship between Ethereum Provider and client is a trusted one, where it is assumed that the user implicitly trusts the Ethereum Provider which is how it managed to get injected into the client, or the client expressly pulled in a connection to it.
Copyright
Copyright and related rights waived via CC0.