hedera 0.8.0

The SDK for interacting with Hedera Hashgraph.
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

/*
 * ‌
 * Hedera Rust SDK
 * ​
 * Copyright (C) 2022 - 2023 Hedera Hashgraph, LLC
 * ​
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ‍
 */

use hedera_proto::mirror;
use time::OffsetDateTime;

use crate::{
    FromProtobuf,
    TransactionId,
};

/// Topic message records.
#[derive(Clone, Debug)]
#[cfg_attr(feature = "ffi", derive(serde::Serialize))]
#[cfg_attr(feature = "ffi", serde(rename_all = "camelCase"))]
pub struct TopicMessage {
    /// The consensus timestamp of the message.
    #[cfg_attr(
        feature = "ffi",
        serde(with = "serde_with::As::<serde_with::TimestampNanoSeconds>")
    )]
    pub consensus_timestamp: OffsetDateTime,

    /// The content of the message.
    #[cfg_attr(feature = "ffi", serde(with = "serde_with::As::<serde_with::base64::Base64>"))]
    pub contents: Vec<u8>,

    /// The new running hash of the topic that received the message.
    #[cfg_attr(feature = "ffi", serde(with = "serde_with::As::<serde_with::base64::Base64>"))]
    pub running_hash: Vec<u8>,

    /// Version of the SHA-384 digest used to update the running hash.
    pub running_hash_version: u64,

    /// The sequence number of the message relative to all other messages
    /// for the same topic.
    pub sequence_number: u64,

    /// The [`TransactionId`] of the first chunk, gets copied to every subsequent chunk in
    /// a fragmented message.
    pub initial_transaction_id: Option<TransactionId>,

    /// The sequence number (from 1 to total) of the current chunk in the message.
    pub chunk_number: u32,

    /// The total number of chunks in the message.
    pub chunk_total: u32,
}

impl FromProtobuf<mirror::ConsensusTopicResponse> for TopicMessage {
    fn from_protobuf(pb: mirror::ConsensusTopicResponse) -> crate::Result<Self>
    where
        Self: Sized,
    {
        let consensus_at = pb_getf!(pb, consensus_timestamp)?.into();
        let sequence_number = pb.sequence_number;
        let running_hash = pb.running_hash;
        let running_hash_version = pb.running_hash_version;
        let contents = pb.message;

        let (initial_transaction_id, chunk_number, chunk_total) = if let Some(chunk_info) =
            pb.chunk_info
        {
            (chunk_info.initial_transaction_id, chunk_info.number as u32, chunk_info.total as u32)
        } else {
            (None, 1, 1)
        };

        let initial_transaction_id = Option::from_protobuf(initial_transaction_id)?;

        Ok(Self {
            consensus_timestamp: consensus_at,
            contents,
            running_hash,
            running_hash_version,
            sequence_number,
            initial_transaction_id,
            chunk_number,
            chunk_total,
        })
    }
}