1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

// Copyright 2015-2018 Parity Technologies (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/>.

//! Trie test input deserialization.

use std::fmt;
use std::collections::BTreeMap;
use std::str::FromStr;
use bytes::Bytes;
use serde::{Deserialize, Deserializer};
use serde::de::{Error as ErrorTrait, Visitor, MapAccess, SeqAccess};

/// Trie test input.
#[derive(Debug, PartialEq)]
pub struct Input {
	/// Input params.
	pub data: BTreeMap<Bytes, Option<Bytes>>,
}

impl<'a> Deserialize<'a> for Input {
	fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
		where D: Deserializer<'a>
	{
		deserializer.deserialize_any(InputVisitor)
	}
}

struct InputVisitor;

impl<'a> Visitor<'a> for InputVisitor {
	type Value = Input;

	fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
		write!(formatter, "a map of bytes into bytes")
	}

	fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> where V: MapAccess<'a> {
		let mut result = BTreeMap::new();

		loop {
			let key_str: Option<String> = visitor.next_key()?;
			let key = match key_str {
				Some(ref k) if k.starts_with("0x") => Bytes::from_str(k).map_err(V::Error::custom)?,
				Some(k) => Bytes::new(k.into_bytes()),
				None => { break; }
			};

			let val_str: Option<String> = visitor.next_value()?;
			let val = match val_str {
				Some(ref v) if v.starts_with("0x") => Some(Bytes::from_str(v).map_err(V::Error::custom)?),
				Some(v) => Some(Bytes::new(v.into_bytes())),
				None => None,
			};

			result.insert(key, val);
		}

		let input = Input {
			data: result
		};

		Ok(input)
	}

	fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error> where V: SeqAccess<'a> {
		let mut result = BTreeMap::new();

		loop {
			let keyval: Option<Vec<Option<String>>> = visitor.next_element()?;
			let keyval = match keyval {
				Some(k) => k,
				_ => { break; },
			};

			if keyval.len() != 2 {
				return Err(V::Error::custom("Invalid key value pair."));
			}

			let ref key_str: Option<String> = keyval[0];
			let ref val_str: Option<String> = keyval[1];

			let key = match *key_str {
				Some(ref k) if k.starts_with("0x") => Bytes::from_str(k).map_err(V::Error::custom)?,
				Some(ref k) => Bytes::new(k.clone().into_bytes()),
				None => { break; }
			};

			let val = match *val_str {
				Some(ref v) if v.starts_with("0x") => Some(Bytes::from_str(v).map_err(V::Error::custom)?),
				Some(ref v) => Some(Bytes::new(v.clone().into_bytes())),
				None => None,
			};

			result.insert(key, val);
		}

		let input = Input {
			data: result
		};

		Ok(input)
	}
}

#[cfg(test)]
mod tests {
	use std::collections::BTreeMap;
	use serde_json;
	use bytes::Bytes;
	use super::Input;

	#[test]
	fn input_deserialization_from_map() {
		let s = r#"{
			"0x0045" : "0x0123456789",
			"be" : "e",
			"0x0a" : null
		}"#;

		let input: Input = serde_json::from_str(s).unwrap();
		let mut map = BTreeMap::new();
		map.insert(Bytes::new(vec![0, 0x45]), Some(Bytes::new(vec![0x01, 0x23, 0x45, 0x67, 0x89])));
		map.insert(Bytes::new(vec![0x62, 0x65]), Some(Bytes::new(vec![0x65])));
		map.insert(Bytes::new(vec![0x0a]), None);
		assert_eq!(input.data, map);
	}

	#[test]
	fn input_deserialization_from_array() {
		let s = r#"[
			["0x0045", "0x0123456789"],
			["be", "e"],
			["0x0a", null]
		]"#;

		let input: Input = serde_json::from_str(s).unwrap();
		let mut map = BTreeMap::new();
		map.insert(Bytes::new(vec![0, 0x45]), Some(Bytes::new(vec![0x01, 0x23, 0x45, 0x67, 0x89])));
		map.insert(Bytes::new(vec![0x62, 0x65]), Some(Bytes::new(vec![0x65])));
		map.insert(Bytes::new(vec![0x0a]), None);
		assert_eq!(input.data, map);
	}
}