Struct UpdateContext 

pub struct UpdateContext {
    pub slot: Option<u64>,
    pub signature: Option<String>,
    pub timestamp: Option<i64>,
    pub write_version: Option<u64>,
    pub txn_index: Option<u64>,
    pub metadata: HashMap<String, Value>,
}

Context metadata for blockchain updates (accounts and instructions) This structure is designed to be extended over time with additional metadata

Fields

slot: Option<u64>

Blockchain slot number

signature: Option<String>

Transaction signature

timestamp: Option<i64>

Unix timestamp (seconds since epoch) If not provided, will default to current system time when accessed

write_version: Option<u64>

Write version for account updates (monotonically increasing per account within a slot) Used for staleness detection to reject out-of-order updates

txn_index: Option<u64>

Transaction index for instruction updates (orders transactions within a slot) Used for staleness detection to reject out-of-order updates

metadata: HashMap<String, Value>

Additional custom metadata that can be added without breaking changes

Implementations

impl UpdateContext

pub fn new(slot: u64, signature: String) -> Self

Create a new UpdateContext with slot and signature

pub fn with_timestamp(slot: u64, signature: String, timestamp: i64) -> Self

Create a new UpdateContext with slot, signature, and timestamp

pub fn new_account(slot: u64, signature: String, write_version: u64) -> Self

Create context for account updates with write_version for staleness detection

pub fn new_instruction(slot: u64, signature: String, txn_index: u64) -> Self

Create context for instruction updates with txn_index for staleness detection

pub fn timestamp(&self) -> i64

Get the timestamp, falling back to current system time if not set

pub fn empty() -> Self

Create an empty context (for testing or when context is not available)

pub fn with_metadata(self, key: String, value: Value) -> Self

Add custom metadata

pub fn get_metadata(&self, key: &str) -> Option<&Value>

Get metadata value

pub fn to_value(&self) -> Value

Convert context to JSON value for injection into event data

Trait Implementations

impl Clone for UpdateContext

fn clone(&self) -> UpdateContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UpdateContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for UpdateContext

fn default() -> UpdateContext

Returns the “default value” for a type.