163 lines
4.9 KiB
Rust
163 lines
4.9 KiB
Rust
// 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/>.
|
|
|
|
use std::fmt;
|
|
use serde::{Deserialize, Deserializer, Serialize, Serializer};
|
|
use serde::de::{Error, Visitor};
|
|
use ethcore::client::BlockId;
|
|
|
|
/// Represents rpc api block number param.
|
|
#[derive(Debug, PartialEq, Clone, Hash, Eq)]
|
|
pub enum BlockNumber {
|
|
/// Number
|
|
Num(u64),
|
|
/// Latest block
|
|
Latest,
|
|
/// Earliest block (genesis)
|
|
Earliest,
|
|
/// Pending block (being mined)
|
|
Pending,
|
|
}
|
|
|
|
impl Default for BlockNumber {
|
|
fn default() -> Self {
|
|
BlockNumber::Latest
|
|
}
|
|
}
|
|
|
|
impl<'a> Deserialize<'a> for BlockNumber {
|
|
fn deserialize<D>(deserializer: D) -> Result<BlockNumber, D::Error> where D: Deserializer<'a> {
|
|
deserializer.deserialize_any(BlockNumberVisitor)
|
|
}
|
|
}
|
|
|
|
impl BlockNumber {
|
|
/// Convert block number to min block target.
|
|
pub fn to_min_block_num(&self) -> Option<u64> {
|
|
match *self {
|
|
BlockNumber::Num(ref x) => Some(*x),
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// BlockNumber to BlockId conversion
|
|
///
|
|
/// NOTE use only for light clients.
|
|
pub trait LightBlockNumber {
|
|
/// Convert block number to block id.
|
|
fn to_block_id(self) -> BlockId;
|
|
}
|
|
|
|
impl LightBlockNumber for BlockNumber {
|
|
fn to_block_id(self) -> BlockId {
|
|
// NOTE Here we treat `Pending` as `Latest`.
|
|
// Since light clients don't produce pending blocks
|
|
// (they don't have state) we can safely fallback to `Latest`.
|
|
match self {
|
|
BlockNumber::Num(n) => BlockId::Number(n),
|
|
BlockNumber::Earliest => BlockId::Earliest,
|
|
BlockNumber::Latest => BlockId::Latest,
|
|
BlockNumber::Pending => {
|
|
warn!("`Pending` is deprecated and may be removed in future versions. Falling back to `Latest`");
|
|
BlockId::Latest
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Serialize for BlockNumber {
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
|
|
match *self {
|
|
BlockNumber::Num(ref x) => serializer.serialize_str(&format!("0x{:x}", x)),
|
|
BlockNumber::Latest => serializer.serialize_str("latest"),
|
|
BlockNumber::Earliest => serializer.serialize_str("earliest"),
|
|
BlockNumber::Pending => serializer.serialize_str("pending"),
|
|
}
|
|
}
|
|
}
|
|
|
|
struct BlockNumberVisitor;
|
|
|
|
impl<'a> Visitor<'a> for BlockNumberVisitor {
|
|
type Value = BlockNumber;
|
|
|
|
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
|
|
write!(formatter, "a block number or 'latest', 'earliest' or 'pending'")
|
|
}
|
|
|
|
fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: Error {
|
|
match value {
|
|
"latest" => Ok(BlockNumber::Latest),
|
|
"earliest" => Ok(BlockNumber::Earliest),
|
|
"pending" => Ok(BlockNumber::Pending),
|
|
_ if value.starts_with("0x") => u64::from_str_radix(&value[2..], 16).map(BlockNumber::Num).map_err(|e| {
|
|
Error::custom(format!("Invalid block number: {}", e))
|
|
}),
|
|
_ => Err(Error::custom("Invalid block number: missing 0x prefix".to_string())),
|
|
}
|
|
}
|
|
|
|
fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: Error {
|
|
self.visit_str(value.as_ref())
|
|
}
|
|
}
|
|
|
|
/// Converts `BlockNumber` to `BlockId`, panics on `BlockNumber::Pending`
|
|
pub fn block_number_to_id(number: BlockNumber) -> BlockId {
|
|
match number {
|
|
BlockNumber::Num(num) => BlockId::Number(num),
|
|
BlockNumber::Earliest => BlockId::Earliest,
|
|
BlockNumber::Latest => BlockId::Latest,
|
|
|
|
BlockNumber::Pending => panic!("`BlockNumber::Pending` should be handled manually")
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use ethcore::client::BlockId;
|
|
use super::*;
|
|
use serde_json;
|
|
|
|
#[test]
|
|
fn block_number_deserialization() {
|
|
let s = r#"["0xa", "latest", "earliest", "pending"]"#;
|
|
let deserialized: Vec<BlockNumber> = serde_json::from_str(s).unwrap();
|
|
assert_eq!(deserialized, vec![BlockNumber::Num(10), BlockNumber::Latest, BlockNumber::Earliest, BlockNumber::Pending])
|
|
}
|
|
|
|
#[test]
|
|
fn should_not_deserialize_decimal() {
|
|
let s = r#""10""#;
|
|
assert!(serde_json::from_str::<BlockNumber>(s).is_err());
|
|
}
|
|
|
|
#[test]
|
|
fn normal_block_number_to_id() {
|
|
assert_eq!(block_number_to_id(BlockNumber::Num(100)), BlockId::Number(100));
|
|
assert_eq!(block_number_to_id(BlockNumber::Earliest), BlockId::Earliest);
|
|
assert_eq!(block_number_to_id(BlockNumber::Latest), BlockId::Latest);
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn pending_block_number_to_id() {
|
|
// Since this function is not allowed to be called in such way, panic should happen
|
|
block_number_to_id(BlockNumber::Pending);
|
|
}
|
|
}
|