toEventSelector

Returns the event selector (topic0) for a given event definition. The selector is the full keccak256 hash of the event signature.

Import

import "github.com/ChefBingbong/viem-go/utils/hash"

Usage

import "github.com/ChefBingbong/viem-go/utils/hash"

// Get event selector
selector, _ := hash.ToEventSelector("event Transfer(address indexed from, address indexed to, uint256 amount)")
// "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"

selector, _ = hash.ToEventSelector("Transfer(address,address,uint256)")
// "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"

// Get selector as bytes
selectorBytes, _ := hash.ToEventSelectorBytes("event Transfer(address,address,uint256)")
// []byte{0xdd, 0xf2, 0x52, ...}

Returns

• Type: (string, error) for ToEventSelector, ([]byte, error) for ToEventSelectorBytes

The event selector (32-byte hash). ToEventSelector returns a hex string with 0x prefix, ToEventSelectorBytes returns raw bytes.

Parameters

event (required)

• Type: string

The event definition string. Can include the event keyword and indexed keywords, or just the signature.

// With event keyword and indexed
selector, _ := hash.ToEventSelector("event Transfer(address indexed from, address indexed to, uint256 amount)")
// "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"

// Without event keyword
selector, _ = hash.ToEventSelector("Transfer(address,address,uint256)")
// "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"

Functions

ToEventSelector

Returns the selector as a hex string:

selector, _ := hash.ToEventSelector("event Transfer(address,address,uint256)")
// "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"

ToEventSelectorBytes

Returns the selector as raw 32 bytes:

selectorBytes, _ := hash.ToEventSelectorBytes("event Transfer(address,address,uint256)")
// []byte{0xdd, 0xf2, 0x52, ...}

Notes

• The event signature is normalized (spaces removed, parameter names and indexed keywords removed) before hashing
• The full 32-byte hash is used (unlike function selectors which use only 4 bytes)
• Event selectors are used as topic0 in event logs