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crate::ix!();
impl AddrManImpl {
/**
| Serialized format.
|
| - format version byte (@see `Format`)
|
| - lowest compatible format version
| byte. This is used to help old software
| decide whether to parse the file. For
| example:
| - Bitcoin Core version N knows how to
| parse up to format=3. If a new format=4
| is introduced in version N+1 that is
| compatible with format=3 and it is
| known that version N will be able to
| parse it, then version N+1 will write
| (format=4, lowest_compatible=3) in the
| first two bytes of the file, and so
| version N will still try to parse it.
| - Bitcoin Core version N+2 introduces
| a new incompatible format=5. It will
| write (format=5, lowest_compatible=5)
| and so any versions that do not know
| how to parse format=5 will not try to
| read the file.
|
| - nKey
| - n_new
| - nTried
| - number of "new" buckets XOR 2**30
| - all new addresses (total count: n_new)
| - all tried addresses (total count: nTried)
| - for each new bucket:
| - number of elements
| - for each element: index in the
| serialized "all new addresses"
|
| - asmap checksum
|
| 2**30 is xorred with the number of buckets
| to make addrman deserializer v0 detect it
| as incompatible. This is necessary because
| it did not check the version number on
| deserialization.
|
| vvNew, vvTried, mapInfo, mapAddr and
| vRandom are never encoded explicitly; they
| are instead reconstructed from the other
| information.
|
| This format is more complex, but
| significantly smaller (at most 1.5 MiB),
| and supports changes to the ADDRMAN_
| parameters without breaking the on-disk
| structure.
|
| We don't use SERIALIZE_METHODS since the
| serialization and deserialization code has
| very little in common.
*/
pub fn serialize<Stream: GetVersion + GetType>(&self, stream: &mut Stream) {
let inner = self.cs.lock();
// Always serialize in the latest version
// (FILE_FORMAT).
let mut s: OverrideStream::<Stream> = OverrideStream::<Stream>::new(
stream,
stream.get_type(),
stream.get_version() | ADDRV2_FORMAT
);
s.stream(ADDR_MAN_FILE_FORMAT as u8);
// Increment `lowest_compatible` iff
// a newly introduced format is
// incompatible with the previous one.
const lowest_compatible: u8 = AddrManFormat::V3_BIP155 as u8;
s.stream((ADDR_MAN_INCOMPATIBILITY_BASE + lowest_compatible) as u8);
s.stream(&self.n_key);
s.stream(&inner.n_new);
s.stream(&inner.n_tried);
let n_ubuckets: i32 = (ADDRMAN_NEW_BUCKET_COUNT ^ (1 << 30)).try_into().unwrap();
s.stream(&n_ubuckets);
let mut map_unk_ids: HashMap<i32,RefCell<i32>> = HashMap::<i32,RefCell<i32>>::default();
let mut n_ids: i32 = 0;
for entry in &inner.map_info {
*map_unk_ids[entry.0].borrow_mut() = n_ids;
let info = &entry.1;
if info.n_ref_count != 0 {
assert!{n_ids != inner.n_new}; // this means n_new was wrong, oh ow
s.stream(&info);
n_ids += 1;
}
}
n_ids = 0;
for entry in &inner.map_info {
let info = &entry.1;
if info.in_tried {
// this means nTried was wrong, oh ow
assert!{n_ids != inner.n_tried};
s.stream(&info);
n_ids += 1;
}
}
for bucket in 0..ADDRMAN_NEW_BUCKET_COUNT {
let mut n_size = 0;
for i in 0..ADDRMAN_BUCKET_SIZE {
if inner.vv_new[bucket][i] != -1 {
n_size += 1;
}
}
s.stream(&n_size);
for i in 0..ADDRMAN_BUCKET_SIZE {
if inner.vv_new[bucket][i] != -1 {
let n_index: i32 = *map_unk_ids[&inner.vv_new[bucket][i]].borrow();
s.stream(&n_index);
}
}
}
/*
| Store asmap checksum after bucket
| entries so that it can be ignored
| by older clients for backward
| compatibility.
*/
let mut asmap_checksum: u256 = u256::default();
if self.asmap.len() != 0 {
asmap_checksum = serialize_hash(&self.asmap, None, None);
}
s.stream(&asmap_checksum);
}
}