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use im::{HashMap, HashSet, OrdMap};
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
use crate::bayou::*;
pub type ImapUid = u32;
pub type ImapUidvalidity = u32;
pub type Flag = String;
/// A Mail UUID is composed of two components:
/// - a process identifier, 128 bits
/// - a sequence number, 64 bits
#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash, Debug)]
pub struct MailUuid(pub [u8; 24]);
#[derive(Clone)]
/// A UidIndex handles the mutable part of a mailbox
/// It is built by running the event log on it
/// Each applied log generates a new UidIndex by cloning the previous one
/// and applying the event. This is why we use immutable datastructures
/// that are optimized for cloning (they clone underlying values only if they are modified)
pub struct UidIndex {
pub mail_uid: OrdMap<MailUuid, ImapUid>,
pub mail_flags: OrdMap<MailUuid, Vec<Flag>>,
pub mails_by_uid: OrdMap<ImapUid, MailUuid>,
pub flags: HashMap<Flag, HashSet<MailUuid>>,
pub uidvalidity: ImapUidvalidity,
pub uidnext: ImapUid,
pub internalseq: ImapUid,
}
#[derive(Clone, Serialize, Deserialize, Debug)]
pub enum UidIndexOp {
MailAdd(MailUuid, ImapUid, Vec<Flag>),
MailDel(MailUuid),
FlagAdd(MailUuid, Vec<Flag>),
FlagDel(MailUuid, Vec<Flag>),
}
impl UidIndex {
#[must_use]
pub fn op_mail_add(&self, uuid: MailUuid, flags: Vec<Flag>) -> UidIndexOp {
UidIndexOp::MailAdd(uuid, self.internalseq, flags)
}
#[must_use]
pub fn op_mail_del(&self, uuid: MailUuid) -> UidIndexOp {
UidIndexOp::MailDel(uuid)
}
#[must_use]
pub fn op_flag_add(&self, uuid: MailUuid, flags: Vec<Flag>) -> UidIndexOp {
UidIndexOp::FlagAdd(uuid, flags)
}
#[must_use]
pub fn op_flag_del(&self, uuid: MailUuid, flags: Vec<Flag>) -> UidIndexOp {
UidIndexOp::FlagDel(uuid, flags)
}
}
impl Default for UidIndex {
fn default() -> Self {
Self {
mail_flags: OrdMap::new(),
mail_uid: OrdMap::new(),
mails_by_uid: OrdMap::new(),
flags: HashMap::new(),
uidvalidity: 1,
uidnext: 1,
internalseq: 1,
}
}
}
impl BayouState for UidIndex {
type Op = UidIndexOp;
fn apply(&self, op: &UidIndexOp) -> Self {
let mut new = self.clone();
match op {
UidIndexOp::MailAdd(uuid, uid, flags) => {
if *uid < new.internalseq {
new.uidvalidity += new.internalseq - *uid;
}
let new_uid = new.internalseq;
if let Some(prev_uid) = new.mail_uid.get(uuid) {
new.mails_by_uid.remove(prev_uid);
} else {
new.mail_flags.insert(*uuid, flags.clone());
}
new.mails_by_uid.insert(new_uid, *uuid);
new.mail_uid.insert(*uuid, new_uid);
new.internalseq += 1;
new.uidnext = new.internalseq;
}
UidIndexOp::MailDel(uuid) => {
if let Some(uid) = new.mail_uid.get(uuid) {
new.mails_by_uid.remove(uid);
new.mail_uid.remove(uuid);
new.mail_flags.remove(uuid);
}
new.internalseq += 1;
}
UidIndexOp::FlagAdd(uuid, new_flags) => {
// Upate mapping Email -> Flag
let mail_flags = new.mail_flags.entry(*uuid).or_insert(vec![]);
for flag in new_flags {
if !mail_flags.contains(flag) {
mail_flags.push(flag.to_string());
}
}
// Update mapping Flag -> Email
let _ = new_flags.iter().map(|flag| {
new.flags
.entry(flag.clone())
.or_insert(HashSet::new())
.update(*uuid)
});
}
UidIndexOp::FlagDel(uuid, rm_flags) => {
// Upate mapping Email -> Flag
if let Some(mail_flags) = new.mail_flags.get_mut(uuid) {
mail_flags.retain(|x| !rm_flags.contains(x));
}
// Update mapping Flag -> Email
rm_flags.iter().for_each(|flag| {
new.flags
.entry(flag.clone())
.and_modify(|hs| { hs.remove(uuid); });
});
}
}
new
}
}
// ---- CUSTOM SERIALIZATION AND DESERIALIZATION ----
#[derive(Serialize, Deserialize)]
struct UidIndexSerializedRepr {
mails: Vec<(ImapUid, MailUuid, Vec<Flag>)>,
uidvalidity: ImapUidvalidity,
uidnext: ImapUid,
internalseq: ImapUid,
}
impl<'de> Deserialize<'de> for UidIndex {
fn deserialize<D>(d: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let val: UidIndexSerializedRepr = UidIndexSerializedRepr::deserialize(d)?;
let mut uidindex = UidIndex {
mail_flags: OrdMap::new(),
mail_uid: OrdMap::new(),
mails_by_uid: OrdMap::new(),
flags: HashMap::new(),
uidvalidity: val.uidvalidity,
uidnext: val.uidnext,
internalseq: val.internalseq,
};
for (uid, uuid, flags) in val.mails {
uidindex.mail_flags.insert(uuid, flags);
uidindex.mail_uid.insert(uuid, uid);
uidindex.mails_by_uid.insert(uid, uuid);
}
Ok(uidindex)
}
}
impl Serialize for UidIndex {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let mut mails = vec![];
for (uid, uuid) in self.mails_by_uid.iter() {
mails.push((
*uid,
*uuid,
self.mail_flags.get(uuid).cloned().unwrap_or_default(),
));
}
let val = UidIndexSerializedRepr {
mails,
uidvalidity: self.uidvalidity,
uidnext: self.uidnext,
internalseq: self.internalseq,
};
val.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for MailUuid {
fn deserialize<D>(d: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let v = String::deserialize(d)?;
let bytes = hex::decode(v).map_err(|_| D::Error::custom("invalid hex"))?;
if bytes.len() != 24 {
return Err(D::Error::custom("bad length"));
}
let mut tmp = [0u8; 24];
tmp[..].copy_from_slice(&bytes);
Ok(Self(tmp))
}
}
impl Serialize for MailUuid {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str(&hex::encode(self.0))
}
}
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