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
use crate::block::Block;
use anyhow::ensure;
use diem_crypto::hash::HashValue;
use diem_types::validator_verifier::ValidatorVerifier;
use serde::{Deserialize, Serialize};
use short_hex_str::AsShortHexStr;
use std::fmt;
pub const MAX_BLOCKS_PER_REQUEST: u64 = 10;
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
pub struct BlockRetrievalRequest {
block_id: HashValue,
num_blocks: u64,
}
impl BlockRetrievalRequest {
pub fn new(block_id: HashValue, num_blocks: u64) -> Self {
Self {
block_id,
num_blocks,
}
}
pub fn block_id(&self) -> HashValue {
self.block_id
}
pub fn num_blocks(&self) -> u64 {
self.num_blocks
}
}
impl fmt::Display for BlockRetrievalRequest {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"[BlockRetrievalRequest starting from id {} with {} blocks]",
self.block_id, self.num_blocks
)
}
}
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
pub enum BlockRetrievalStatus {
Succeeded,
IdNotFound,
NotEnoughBlocks,
}
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
pub struct BlockRetrievalResponse {
status: BlockRetrievalStatus,
blocks: Vec<Block>,
}
impl BlockRetrievalResponse {
pub fn new(status: BlockRetrievalStatus, blocks: Vec<Block>) -> Self {
Self { status, blocks }
}
pub fn status(&self) -> BlockRetrievalStatus {
self.status.clone()
}
pub fn blocks(&self) -> &Vec<Block> {
&self.blocks
}
pub fn verify(
&self,
block_id: HashValue,
num_blocks: u64,
sig_verifier: &ValidatorVerifier,
) -> anyhow::Result<()> {
ensure!(
self.status != BlockRetrievalStatus::Succeeded
|| self.blocks.len() as u64 == num_blocks,
"not enough blocks returned, expect {}, get {}",
num_blocks,
self.blocks.len(),
);
self.blocks
.iter()
.try_fold(block_id, |expected_id, block| {
block.validate_signature(sig_verifier)?;
block.verify_well_formed()?;
ensure!(
block.id() == expected_id,
"blocks doesn't form a chain: expect {}, get {}",
expected_id,
block.id()
);
Ok(block.parent_id())
})
.map(|_| ())
}
}
impl fmt::Display for BlockRetrievalResponse {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.status() {
BlockRetrievalStatus::Succeeded => {
write!(
f,
"[BlockRetrievalResponse: status: {:?}, num_blocks: {}, block_ids: ",
self.status(),
self.blocks().len(),
)?;
f.debug_list()
.entries(self.blocks.iter().map(|b| b.id().short_str()))
.finish()?;
write!(f, "]")
}
_ => write!(f, "[BlockRetrievalResponse: status: {:?}]", self.status()),
}
}
}