hiero-sdk 0.38.1

The SDK for interacting with Hedera Hashgraph.
Documentation 
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

// SPDX-License-Identifier: Apache-2.0

use hiero_sdk_proto::services;
use time::OffsetDateTime;

use crate::protobuf::FromProtobuf;
use crate::ToProtobuf;

/// The current and next exchange rates between [`Hbar`](crate::HbarUnit::Hbar) and USD-cents.
#[derive(Debug, Clone)]
pub struct ExchangeRates {
    /// The current exchange rate between [`Hbar`](crate::HbarUnit::Hbar) and USD-cents.
    pub current_rate: ExchangeRate,
    /// The next exchange rate between [`Hbar`](crate::HbarUnit::Hbar) and USD-cents.
    pub next_rate: ExchangeRate,
}

impl ExchangeRates {
    /// Create a new `ExchangeRates` from protobuf-encoded `bytes`.
    ///
    /// # Errors
    /// - [`Error::FromProtobuf`](crate::Error::FromProtobuf) if decoding the bytes fails to produce a valid protobuf.
    /// - [`Error::FromProtobuf`](crate::Error::FromProtobuf) if decoding the protobuf fails.
    pub fn from_bytes(bytes: &[u8]) -> crate::Result<Self> {
        FromProtobuf::from_bytes(bytes)
    }
}

impl FromProtobuf<services::ExchangeRateSet> for ExchangeRates {
    fn from_protobuf(pb: services::ExchangeRateSet) -> crate::Result<Self> {
        Ok(Self {
            current_rate: ExchangeRate::from_protobuf(pb_getf!(pb, current_rate)?)?,
            next_rate: ExchangeRate::from_protobuf(pb_getf!(pb, next_rate)?)?,
        })
    }
}

impl ToProtobuf for ExchangeRates {
    type Protobuf = services::ExchangeRateSet;

    fn to_protobuf(&self) -> Self::Protobuf {
        services::ExchangeRateSet {
            current_rate: Some(self.current_rate.to_protobuf()),
            next_rate: Some(self.next_rate.to_protobuf()),
        }
    }
}

/// Denotes a conversion between Hbars and cents (USD).
#[derive(Debug, Clone)]
pub struct ExchangeRate {
    /// Denotes [`Hbar`](crate::HbarUnit::Hbar) equivalent to cents (USD).
    pub hbars: u32,

    /// Denotes cents (USD) equivalent to [`Hbar`](crate::HbarUnit::Hbar).
    pub cents: u32,

    /// Expiration time of this exchange rate.
    pub expiration_time: OffsetDateTime,

    /// Exchange rate in cents
    pub exchange_rate_in_cents: f64,
}

impl ExchangeRate {
    /// Calculated exchange rate.
    #[must_use]
    pub fn exchange_rate_in_cents(&self) -> f64 {
        f64::from(self.cents) / f64::from(self.hbars)
    }
}

impl FromProtobuf<services::ExchangeRate> for ExchangeRate {
    fn from_protobuf(pb: services::ExchangeRate) -> crate::Result<Self> {
        let hbars = pb.hbar_equiv as u32;
        let cents = pb.cent_equiv as u32;

        let exchange_rate_in_cents = f64::from(cents) / f64::from(hbars);

        Ok(Self {
            hbars,
            cents,
            exchange_rate_in_cents,
            expiration_time: pb_getf!(pb, expiration_time)?.into(),
        })
    }
}

impl ToProtobuf for ExchangeRate {
    type Protobuf = services::ExchangeRate;

    fn to_protobuf(&self) -> Self::Protobuf {
        services::ExchangeRate {
            hbar_equiv: self.hbars as i32,
            cent_equiv: self.cents as i32,
            expiration_time: Some(self.expiration_time.into()),
        }
    }
}

#[cfg(test)]
mod tests {
    use expect_test::expect;
    use hex_literal::hex;

    use crate::ExchangeRates;

    #[test]
    fn from_protobuf() {
        let exchange_rates = ExchangeRates::from_bytes(&hex!(
            "0a1008b0ea0110b6b4231a0608f0bade9006121008b0ea01108cef231a060880d7de9006"
        ))
        .unwrap();

        expect![[r#"
            ExchangeRates {
                current_rate: ExchangeRate {
                    hbars: 30000,
                    cents: 580150,
                    expiration_time: 2022-02-24 15:00:00.0 +00:00:00,
                    exchange_rate_in_cents: 19.338333333333335,
                },
                next_rate: ExchangeRate {
                    hbars: 30000,
                    cents: 587660,
                    expiration_time: 2022-02-24 16:00:00.0 +00:00:00,
                    exchange_rate_in_cents: 19.588666666666665,
                },
            }
        "#]]
        .assert_debug_eq(&exchange_rates);
    }
}