cardano_serialization_lib/serialization/block/
header_body.rs

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
use crate::*;

impl cbor_event::se::Serialize for HeaderBody {
    fn serialize<'se, W: Write>(
        &self,
        serializer: &'se mut Serializer<W>,
    ) -> cbor_event::Result<&'se mut Serializer<W>> {
        serializer.write_array(cbor_event::Len::Len(15))?;
        self.block_number.serialize(serializer)?;
        self.slot.serialize(serializer)?;
        match &self.prev_hash {
            Some(x) => x.serialize(serializer),
            None => serializer.write_special(CBORSpecial::Null),
        }?;
        self.issuer_vkey.serialize(serializer)?;
        self.vrf_vkey.serialize(serializer)?;
        match &self.leader_cert {
            HeaderLeaderCertEnum::NonceAndLeader(nonce_vrf, leader_vrf) => {
                nonce_vrf.serialize(serializer)?;
                leader_vrf.serialize(serializer)?;
            }
            HeaderLeaderCertEnum::VrfResult(vrf_cert) => {
                vrf_cert.serialize(serializer)?;
            }
        }
        self.block_body_size.serialize(serializer)?;
        self.block_body_hash.serialize(serializer)?;
        self.operational_cert
            .serialize_as_embedded_group(serializer)?;
        self.protocol_version
            .serialize_as_embedded_group(serializer)?;
        Ok(serializer)
    }
}

impl Deserialize for HeaderBody {
    fn deserialize<R: BufRead + Seek>(raw: &mut Deserializer<R>) -> Result<Self, DeserializeError> {
        (|| -> Result<_, DeserializeError> {
            let len = raw.array()?;
            let ret = Self::deserialize_as_embedded_group(raw, len);
            match len {
                cbor_event::Len::Len(_) =>
                /* TODO: check finite len somewhere */
                    {
                        ()
                    }
                cbor_event::Len::Indefinite => match raw.special()? {
                    CBORSpecial::Break =>
                    /* it's ok */
                        {
                            ()
                        }
                    _ => return Err(DeserializeFailure::EndingBreakMissing.into()),
                },
            }
            ret
        })()
            .map_err(|e| e.annotate("HeaderBody"))
    }
}

impl DeserializeEmbeddedGroup for HeaderBody {
    fn deserialize_as_embedded_group<R: BufRead + Seek>(
        raw: &mut Deserializer<R>,
        len: cbor_event::Len,
    ) -> Result<Self, DeserializeError> {
        let block_number = (|| -> Result<_, DeserializeError> { Ok(u32::deserialize(raw)?) })()
            .map_err(|e| e.annotate("block_number"))?;
        let slot = (|| -> Result<_, DeserializeError> { Ok(SlotBigNum::deserialize(raw)?) })()
            .map_err(|e| e.annotate("slot"))?;
        let prev_hash = (|| -> Result<_, DeserializeError> {
            Ok(match raw.cbor_type()? != CBORType::Special {
                true => Some(BlockHash::deserialize(raw)?),
                false => {
                    if raw.special()? != CBORSpecial::Null {
                        return Err(DeserializeFailure::ExpectedNull.into());
                    }
                    None
                }
            })
        })()
            .map_err(|e| e.annotate("prev_hash"))?;
        let issuer_vkey = (|| -> Result<_, DeserializeError> { Ok(Vkey::deserialize(raw)?) })()
            .map_err(|e| e.annotate("issuer_vkey"))?;
        let vrf_vkey = (|| -> Result<_, DeserializeError> { Ok(VRFVKey::deserialize(raw)?) })()
            .map_err(|e| e.annotate("vrf_vkey"))?;
        let leader_cert = {
            // NONCE VFR CERT, first of two certs
            // or a single VRF RESULT CERT
            // depending on the protocol version
            let first_vrf_cert =
                (|| -> Result<_, DeserializeError> { Ok(VRFCert::deserialize(raw)?) })()
                    .map_err(|e| e.annotate("nonce_vrf"))?;
            let cbor_type: cbor_event::Type = raw.cbor_type()?;
            match cbor_type {
                cbor_event::Type::Array => {
                    // Legacy format, reading the second VRF cert
                    let leader_vrf =
                        (|| -> Result<_, DeserializeError> { Ok(VRFCert::deserialize(raw)?) })()
                            .map_err(|e| e.annotate("leader_vrf"))?;
                    HeaderLeaderCertEnum::NonceAndLeader(first_vrf_cert, leader_vrf)
                }
                cbor_event::Type::UnsignedInteger => {
                    // New format, no second VRF cert is present
                    HeaderLeaderCertEnum::VrfResult(first_vrf_cert)
                }
                t => {
                    return Err(DeserializeError::new(
                        "HeaderBody.leader_cert",
                        DeserializeFailure::UnexpectedKeyType(t),
                    ))
                }
            }
        };
        let block_body_size = (|| -> Result<_, DeserializeError> { Ok(u32::deserialize(raw)?) })()
            .map_err(|e| e.annotate("block_body_size"))?;
        let block_body_hash =
            (|| -> Result<_, DeserializeError> { Ok(BlockHash::deserialize(raw)?) })()
                .map_err(|e| e.annotate("block_body_hash"))?;

        let operational_cert = (|| -> Result<_, DeserializeError> {
            if raw.cbor_type()? == CBORType::Array {
                Ok(OperationalCert::deserialize(raw)?)
            } else {
                Ok(OperationalCert::deserialize_as_embedded_group(raw, len)?)
            }
        })()
            .map_err(|e| e.annotate("operational_cert"))?;
        let protocol_version = (|| -> Result<_, DeserializeError> {
            if raw.cbor_type()? == CBORType::Array {
                Ok(ProtocolVersion::deserialize(raw)?)
            } else {
                Ok(ProtocolVersion::deserialize_as_embedded_group(raw, len)?)
            }
        })()
            .map_err(|e| e.annotate("protocol_version"))?;
        Ok(HeaderBody {
            block_number,
            slot,
            prev_hash,
            issuer_vkey,
            vrf_vkey,
            leader_cert,
            block_body_size,
            block_body_hash,
            operational_cert,
            protocol_version,
        })
    }
}