28 lines
733 B
Rust
28 lines
733 B
Rust
//! Helper type with all filter state data.
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use std::collections::HashSet;
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use ethereum_types::H256;
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use v1::types::{Filter, Log};
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pub type BlockNumber = u64;
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/// Filter state.
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#[derive(Clone)]
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pub enum PollFilter {
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/// Number of last block which client was notified about.
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Block(BlockNumber),
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/// Hashes of all transactions which client was notified about.
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PendingTransaction(Vec<H256>),
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/// Number of From block number, pending logs and log filter itself.
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Logs(BlockNumber, HashSet<Log>, Filter)
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}
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/// Returns only last `n` logs
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pub fn limit_logs(mut logs: Vec<Log>, limit: Option<usize>) -> Vec<Log> {
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let len = logs.len();
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match limit {
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Some(limit) if len >= limit => logs.split_off(len - limit),
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_ => logs,
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}
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}
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