83 lines
2.4 KiB
Rust
83 lines
2.4 KiB
Rust
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use crate::ContractError;
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use ethers_abi::{Detokenize, Event as AbiEvent, RawLog};
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use ethers_providers::{JsonRpcClient, Provider};
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use ethers_types::{BlockNumber, Filter, ValueOrArray, H256};
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use std::marker::PhantomData;
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pub struct Event<'a, 'b, P, D> {
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pub filter: Filter,
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pub(crate) provider: &'a Provider<P>,
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pub(crate) event: &'b AbiEvent,
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pub(crate) datatype: PhantomData<D>,
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}
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// TODO: Improve these functions
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impl<'a, 'b, P, D: Detokenize> Event<'a, 'b, P, D> {
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#[allow(clippy::wrong_self_convention)]
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pub fn from_block<T: Into<BlockNumber>>(mut self, block: T) -> Self {
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self.filter.from_block = Some(block.into());
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self
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}
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#[allow(clippy::wrong_self_convention)]
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pub fn to_block<T: Into<BlockNumber>>(mut self, block: T) -> Self {
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self.filter.to_block = Some(block.into());
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self
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}
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pub fn topic0<T: Into<ValueOrArray<H256>>>(mut self, topic: T) -> Self {
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self.filter.topics.push(topic.into());
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self
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}
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pub fn topics(mut self, topics: &[ValueOrArray<H256>]) -> Self {
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self.filter.topics.extend_from_slice(topics);
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self
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}
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}
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// TODO: Can we get rid of the static?
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impl<'a, 'b, P: JsonRpcClient, D: Detokenize> Event<'a, 'b, P, D>
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where
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P::Error: 'static,
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{
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/// Queries the blockchain for the selected filter and returns a vector of matching
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/// event logs
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pub async fn query(self) -> Result<Vec<D>, ContractError<P>> {
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// get the logs
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let logs = self
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.provider
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.get_logs(&self.filter)
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.await
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.map_err(ContractError::CallError)?;
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let events = logs
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.into_iter()
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.map(|log| {
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// ethabi parses the unindexed and indexed logs together to a
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// vector of tokens
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let tokens = self
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.event
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.parse_log(RawLog {
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topics: log.topics,
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data: log.data.0,
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})?
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.params
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.into_iter()
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.map(|param| param.value)
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.collect::<Vec<_>>();
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// convert the tokens to the requested datatype
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Ok::<_, ContractError<P>>(D::from_tokens(tokens)?)
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})
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.collect::<Result<Vec<_>, _>>()?;
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Ok(events)
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}
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// TODO: Add filter watchers
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}
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