189 lines
5.6 KiB
Rust
189 lines
5.6 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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use serde::de::Error;
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use serde_json::{Value, from_value};
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use ethcore::filter::Filter as EthFilter;
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use ethcore::client::BlockId;
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use v1::types::{BlockNumber, H160, H256, Log};
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/// Variadic value
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#[derive(Debug, PartialEq, Clone)]
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pub enum VariadicValue<T> where T: Deserialize {
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/// Single
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Single(T),
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/// List
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Multiple(Vec<T>),
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/// None
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Null,
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}
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impl<T> Deserialize for VariadicValue<T> where T: Deserialize {
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fn deserialize<D>(deserializer: D) -> Result<VariadicValue<T>, D::Error>
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where D: Deserializer {
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let v: Value = Deserialize::deserialize(deserializer)?;
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if v.is_null() {
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return Ok(VariadicValue::Null);
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}
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from_value(v.clone()).map(VariadicValue::Single)
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.or_else(|_| from_value(v).map(VariadicValue::Multiple))
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.map_err(|_| D::Error::custom("Invalid type."))
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}
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}
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/// Filter Address
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pub type FilterAddress = VariadicValue<H160>;
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/// Topic
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pub type Topic = VariadicValue<H256>;
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/// Filter
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#[derive(Debug, PartialEq, Clone, Deserialize)]
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#[serde(deny_unknown_fields)]
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pub struct Filter {
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/// From Block
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#[serde(rename="fromBlock")]
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pub from_block: Option<BlockNumber>,
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/// To Block
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#[serde(rename="toBlock")]
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pub to_block: Option<BlockNumber>,
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/// Address
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pub address: Option<FilterAddress>,
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/// Topics
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pub topics: Option<Vec<Topic>>,
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/// Limit
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pub limit: Option<usize>,
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}
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impl Into<EthFilter> for Filter {
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fn into(self) -> EthFilter {
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EthFilter {
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from_block: self.from_block.map_or_else(|| BlockId::Latest, Into::into),
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to_block: self.to_block.map_or_else(|| BlockId::Latest, Into::into),
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address: self.address.and_then(|address| match address {
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VariadicValue::Null => None,
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VariadicValue::Single(a) => Some(vec![a.into()]),
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VariadicValue::Multiple(a) => Some(a.into_iter().map(Into::into).collect())
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}),
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topics: {
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let mut iter = self.topics.map_or_else(Vec::new, |topics| topics.into_iter().take(4).map(|topic| match topic {
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VariadicValue::Null => None,
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VariadicValue::Single(t) => Some(vec![t.into()]),
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VariadicValue::Multiple(t) => Some(t.into_iter().map(Into::into).collect())
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}).collect()).into_iter();
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vec![
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iter.next().unwrap_or(None),
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iter.next().unwrap_or(None),
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iter.next().unwrap_or(None),
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iter.next().unwrap_or(None)
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]
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},
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limit: self.limit,
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}
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}
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}
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/// Results of the filter_changes RPC.
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#[derive(Debug, PartialEq)]
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pub enum FilterChanges {
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/// New logs.
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Logs(Vec<Log>),
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/// New hashes (block or transactions)
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Hashes(Vec<H256>),
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/// Empty result,
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Empty,
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}
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impl Serialize for FilterChanges {
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fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error> where S: Serializer {
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match *self {
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FilterChanges::Logs(ref logs) => logs.serialize(s),
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FilterChanges::Hashes(ref hashes) => hashes.serialize(s),
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FilterChanges::Empty => (&[] as &[Value]).serialize(s),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use serde_json;
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use std::str::FromStr;
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use util::hash::H256;
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use super::{VariadicValue, Topic, Filter};
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use v1::types::BlockNumber;
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use ethcore::filter::Filter as EthFilter;
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use ethcore::client::BlockId;
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#[test]
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fn topic_deserialization() {
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let s = r#"["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", null, ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc"]]"#;
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let deserialized: Vec<Topic> = serde_json::from_str(s).unwrap();
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assert_eq!(deserialized, vec![
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VariadicValue::Single(H256::from_str("000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b").unwrap().into()),
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VariadicValue::Null,
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VariadicValue::Multiple(vec![
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H256::from_str("000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b").unwrap().into(),
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H256::from_str("0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc").unwrap().into(),
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])
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]);
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}
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#[test]
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fn filter_deserialization() {
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let s = r#"{"fromBlock":"earliest","toBlock":"latest"}"#;
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let deserialized: Filter = serde_json::from_str(s).unwrap();
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assert_eq!(deserialized, Filter {
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from_block: Some(BlockNumber::Earliest),
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to_block: Some(BlockNumber::Latest),
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address: None,
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topics: None,
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limit: None,
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});
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}
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#[test]
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fn filter_conversion() {
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let filter = Filter {
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from_block: Some(BlockNumber::Earliest),
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to_block: Some(BlockNumber::Latest),
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address: Some(VariadicValue::Multiple(vec![])),
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topics: Some(vec![
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VariadicValue::Null,
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VariadicValue::Single("000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b".into()),
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VariadicValue::Null,
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]),
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limit: None,
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};
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let eth_filter: EthFilter = filter.into();
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assert_eq!(eth_filter, EthFilter {
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from_block: BlockId::Earliest,
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to_block: BlockId::Latest,
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address: Some(vec![]),
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topics: vec![
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None,
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Some(vec!["000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b".into()]),
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None,
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None,
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],
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limit: None,
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});
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}
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}
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