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use anyhow::{Result, anyhow};
use super::mailbox::MailMeta;
use super::snapshot::FrozenMailbox;
use super::unique_ident::UniqueIdent;
use super::uidindex::IndexEntry;
use futures::stream::{FuturesUnordered, StreamExt};
/// Query is in charge of fetching efficiently
/// requested data for a list of emails
pub struct Query<'a,'b> {
pub frozen: &'a FrozenMailbox,
pub emails: &'b [UniqueIdent],
}
impl<'a,'b> Query<'a,'b> {
pub fn index(&self) -> Result<Vec<IndexResult>> {
self
.emails
.iter()
.map(|uuid| {
self
.frozen
.snapshot
.table
.get(uuid)
.map(|index| IndexResult { uuid: *uuid, index })
.ok_or(anyhow!("missing email in index"))
})
.collect::<Result<Vec<_>, _>>()
}
pub async fn partial(&self) -> Result<Vec<PartialResult>> {
let meta = self.frozen.mailbox.fetch_meta(self.emails).await?;
let result = meta
.into_iter()
.zip(self.index()?)
.map(|(metadata, index)| PartialResult { uuid: index.uuid, index: index.index, metadata })
.collect::<Vec<_>>();
Ok(result)
}
/// @FIXME WARNING: THIS CAN ALLOCATE A LOT OF MEMORY
/// AND GENERATE SO MUCH NETWORK TRAFFIC.
/// THIS FUNCTION SHOULD BE REWRITTEN, FOR EXAMPLE WITH
/// SOMETHING LIKE AN ITERATOR
pub async fn full(&self) -> Result<Vec<FullResult>> {
let meta_list = self.partial().await?;
meta_list
.into_iter()
.map(|meta| async move {
let content = self.frozen.mailbox.fetch_full(meta.uuid, &meta.metadata.message_key).await?;
Ok(FullResult {
uuid: meta.uuid,
index: meta.index,
metadata: meta.metadata,
content,
})
})
.collect::<FuturesUnordered<_>>()
.collect::<Vec<_>>()
.await
.into_iter()
.collect::<Result<Vec<_>, _>>()
}
}
pub struct IndexResult<'a> {
pub uuid: UniqueIdent,
pub index: &'a IndexEntry,
}
pub struct PartialResult<'a> {
pub uuid: UniqueIdent,
pub index: &'a IndexEntry,
pub metadata: MailMeta,
}
pub struct FullResult<'a> {
pub uuid: UniqueIdent,
pub index: &'a IndexEntry,
pub metadata: MailMeta,
pub content: Vec<u8>,
}
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