87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
use std::{borrow::Cow, convert::TryInto, mem::size_of};
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use heed::{BytesDecode, BytesEncode};
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use uuid::Uuid;
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pub struct NextIdCodec;
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pub enum NextIdKey {
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Global,
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Index(Uuid),
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}
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impl<'a> BytesEncode<'a> for NextIdCodec {
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type EItem = NextIdKey;
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fn bytes_encode(item: &'a Self::EItem) -> Option<Cow<'a, [u8]>> {
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match item {
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NextIdKey::Global => Some(Cow::Borrowed(b"__global__")),
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NextIdKey::Index(ref uuid) => Some(Cow::Borrowed(uuid.as_bytes())),
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}
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}
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}
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pub struct PendingKeyCodec;
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impl<'a> BytesEncode<'a> for PendingKeyCodec {
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type EItem = (u64, Uuid, u64);
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fn bytes_encode((global_id, uuid, update_id): &'a Self::EItem) -> Option<Cow<'a, [u8]>> {
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let mut bytes = Vec::with_capacity(size_of::<Self::EItem>());
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bytes.extend_from_slice(&global_id.to_be_bytes());
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bytes.extend_from_slice(uuid.as_bytes());
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bytes.extend_from_slice(&update_id.to_be_bytes());
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Some(Cow::Owned(bytes))
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}
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}
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impl<'a> BytesDecode<'a> for PendingKeyCodec {
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type DItem = (u64, Uuid, u64);
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let global_id_bytes = bytes.get(0..size_of::<u64>())?.try_into().ok()?;
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let global_id = u64::from_be_bytes(global_id_bytes);
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let uuid_bytes = bytes
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.get(size_of::<u64>()..(size_of::<u64>() + size_of::<Uuid>()))?
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.try_into()
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.ok()?;
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let uuid = Uuid::from_bytes(uuid_bytes);
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let update_id_bytes = bytes
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.get((size_of::<u64>() + size_of::<Uuid>())..)?
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.try_into()
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.ok()?;
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let update_id = u64::from_be_bytes(update_id_bytes);
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Some((global_id, uuid, update_id))
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}
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}
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pub struct UpdateKeyCodec;
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impl<'a> BytesEncode<'a> for UpdateKeyCodec {
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type EItem = (Uuid, u64);
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fn bytes_encode((uuid, update_id): &'a Self::EItem) -> Option<Cow<'a, [u8]>> {
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let mut bytes = Vec::with_capacity(size_of::<Self::EItem>());
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bytes.extend_from_slice(uuid.as_bytes());
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bytes.extend_from_slice(&update_id.to_be_bytes());
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Some(Cow::Owned(bytes))
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}
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}
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impl<'a> BytesDecode<'a> for UpdateKeyCodec {
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type DItem = (Uuid, u64);
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fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
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let uuid_bytes = bytes.get(0..size_of::<Uuid>())?.try_into().ok()?;
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let uuid = Uuid::from_bytes(uuid_bytes);
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let update_id_bytes = bytes.get(size_of::<Uuid>()..)?.try_into().ok()?;
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let update_id = u64::from_be_bytes(update_id_bytes);
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Some((uuid, update_id))
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}
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}
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