cleanup json crate (#11027)

* [json]: cleanup

write something here....

* nit: commit new/moved files

* nit: remove needless features

* nits

* fix(grumbles): use explicit import `DifficultyTest`

* fix(grumbles): remove needless type hints

* fix(grumble): docs `from -> used by`

Co-Authored-By: David <dvdplm@gmail.com>

* fix(grumbles): use explicit `imports`

* fix(grumble): merge `tx` and `tx_with_signing_info`

* fix(grumbles): resolve introduced `TODO's`

json/src/state.rs

@@ -0,0 +1,55 @@
+// Copyright 2015-2019 Parity Technologies (UK) Ltd.
+// This file is part of Parity Ethereum.
+
+// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.
+
+//! State deserialization types
+
+use crate::{
+	bytes::Bytes,
+	hash::{Address, H256, Bloom},
+};
+use serde::Deserialize;
+
+/// State log deserialization.
+#[derive(Debug, PartialEq, Deserialize)]
+pub struct Log {
+	/// Address.
+	pub address: Address,
+	/// Topics.
+	pub topics: Vec<H256>,
+	/// Data.
+	pub data: Bytes,
+	/// Bloom.
+	pub bloom: Bloom,
+}
+
+#[cfg(test)]
+mod tests {
+	use super::Log;
+
+	#[test]
+	fn log_deserialization() {
+		let s = r#"{
+			"address" : "0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6",
+			"bloom" : "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008800000000000000000020000000000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000",
+			"data" : "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+			"topics" : [
+				"0000000000000000000000000000000000000000000000000000000000000000"
+			]
+		}"#;
+		let _deserialized: Log = serde_json::from_str(s).unwrap();
+		// TODO: validate all fields
+	}
+}