From 1f69b60041c97432d0f4bff95705df439c68e513 Mon Sep 17 00:00:00 2001
From: debris <marek.kotewicz@gmail.com>
Date: Tue, 9 Feb 2016 17:37:16 +0100
Subject: [PATCH] filter deserialization

---
 rpc/src/v1/types/filter.rs | 75 ++++++++++++++++++++++++++++++++++++++
 rpc/src/v1/types/mod.rs    |  2 +
 2 files changed, 77 insertions(+)
 create mode 100644 rpc/src/v1/types/filter.rs

diff --git a/rpc/src/v1/types/filter.rs b/rpc/src/v1/types/filter.rs
new file mode 100644
index 000000000..ef2d8b29e
--- /dev/null
+++ b/rpc/src/v1/types/filter.rs
@@ -0,0 +1,75 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use serde::{Deserialize, Deserializer, Error};
+use serde_json::value;
+use jsonrpc_core::Value;
+use util::hash::*;
+use v1::types::BlockNumber;
+
+#[derive(Debug, PartialEq)]
+pub enum Topic {
+	Single(H256),
+	Multiple(Vec<H256>),
+	Null
+}
+
+impl Deserialize for Topic {
+	fn deserialize<D>(deserializer: &mut D) -> Result<Topic, D::Error>
+	where D: Deserializer {
+		let v = try!(Value::deserialize(deserializer));
+
+		if v.is_null() {
+			return Ok(Topic::Null);
+		}
+
+		Deserialize::deserialize(&mut value::Deserializer::new(v.clone())).map(Topic::Single)
+			.or_else(|_| Deserialize::deserialize(&mut value::Deserializer::new(v.clone())).map(Topic::Multiple))
+			.map_err(|_| Error::syntax("")) // unreachable, but types must match
+	}
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Filter {
+	#[serde(rename="fromBlock")]
+	pub from_block: BlockNumber,
+	#[serde(rename="toBlock")]
+	pub to_block: BlockNumber,
+	pub address: Address,
+	pub topics: Vec<Topic>
+}
+
+#[cfg(test)]
+mod tests {
+	use serde_json;
+	use std::str::FromStr;
+	use util::hash::*;
+	use super::*;
+
+	#[test]
+	fn filter_deserialization() {
+		let s = r#"["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", null, ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc"]]"#;
+		let deserialized: Vec<Topic> = serde_json::from_str(s).unwrap();
+		assert_eq!(deserialized, vec![
+				   Topic::Single(H256::from_str("000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b").unwrap()),
+				   Topic::Null,
+				   Topic::Multiple(vec![
+								   H256::from_str("000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b").unwrap(),
+								   H256::from_str("0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc").unwrap()
+				   ])
+		]);
+	}
+}
diff --git a/rpc/src/v1/types/mod.rs b/rpc/src/v1/types/mod.rs
index 9dc57f24f..b35e7ff15 100644
--- a/rpc/src/v1/types/mod.rs
+++ b/rpc/src/v1/types/mod.rs
@@ -17,6 +17,7 @@
 mod block;
 mod block_number;
 mod bytes;
+mod filter;
 mod optionals;
 mod sync;
 mod transaction;
@@ -24,6 +25,7 @@ mod transaction;
 pub use self::block::{Block, BlockTransactions};
 pub use self::block_number::BlockNumber;
 pub use self::bytes::Bytes;
+pub use self::filter::Filter;
 pub use self::optionals::OptionalValue;
 pub use self::sync::SyncStatus;
 pub use self::transaction::Transaction;