aerogramme/src/mail/query.rs

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use super::mailbox::MailMeta;
use super::snapshot::FrozenMailbox;
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use super::unique_ident::UniqueIdent;
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use anyhow::Result;
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use futures::future::FutureExt;
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use futures::stream::{BoxStream, Stream, StreamExt};
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/// Query is in charge of fetching efficiently
/// requested data for a list of emails
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pub struct Query<'a, 'b> {
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pub frozen: &'a FrozenMailbox,
pub emails: &'b [UniqueIdent],
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pub scope: QueryScope,
}
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#[derive(Debug)]
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pub enum QueryScope {
Index,
Partial,
Full,
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}
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impl QueryScope {
pub fn union(&self, other: &QueryScope) -> QueryScope {
match (self, other) {
(QueryScope::Full, _) | (_, QueryScope::Full) => QueryScope::Full,
(QueryScope::Partial, _) | (_, QueryScope::Partial) => QueryScope::Partial,
(QueryScope::Index, QueryScope::Index) => QueryScope::Index,
}
}
}
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//type QueryResultStream = Box<dyn Stream<Item = Result<QueryResult>>>;
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impl<'a, 'b> Query<'a, 'b> {
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pub fn fetch(&self) -> BoxStream<Result<QueryResult>> {
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match self.scope {
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QueryScope::Index => Box::pin(
futures::stream::iter(self.emails)
.map(|&uuid| Ok(QueryResult::IndexResult { uuid })),
),
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QueryScope::Partial => Box::pin(self.partial()),
QueryScope::Full => Box::pin(self.full()),
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}
}
// --- functions below are private *for reasons*
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fn partial<'d>(&'d self) -> impl Stream<Item = Result<QueryResult>> + 'd + Send {
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async move {
let maybe_meta_list: Result<Vec<MailMeta>> =
self.frozen.mailbox.fetch_meta(self.emails).await;
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let list_res = maybe_meta_list
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.map(|meta_list| {
meta_list
.into_iter()
.zip(self.emails)
.map(|(metadata, &uuid)| Ok(QueryResult::PartialResult { uuid, metadata }))
.collect()
})
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.unwrap_or_else(|e| vec![Err(e)]);
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futures::stream::iter(list_res)
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}
.flatten_stream()
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}
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fn full<'d>(&'d self) -> impl Stream<Item = Result<QueryResult>> + 'd + Send {
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self.partial().then(move |maybe_meta| async move {
let meta = maybe_meta?;
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let content = self
.frozen
.mailbox
.fetch_full(
*meta.uuid(),
&meta
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.metadata()
.expect("meta to be PartialResult")
.message_key,
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)
.await?;
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Ok(meta.into_full(content).expect("meta to be PartialResult"))
})
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}
}
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#[derive(Debug, Clone)]
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pub enum QueryResult {
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IndexResult {
uuid: UniqueIdent,
},
PartialResult {
uuid: UniqueIdent,
metadata: MailMeta,
},
FullResult {
uuid: UniqueIdent,
metadata: MailMeta,
content: Vec<u8>,
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},
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}
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impl QueryResult {
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pub fn uuid(&self) -> &UniqueIdent {
match self {
Self::IndexResult { uuid, .. } => uuid,
Self::PartialResult { uuid, .. } => uuid,
Self::FullResult { uuid, .. } => uuid,
}
}
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pub fn metadata(&self) -> Option<&MailMeta> {
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match self {
Self::IndexResult { .. } => None,
Self::PartialResult { metadata, .. } => Some(metadata),
Self::FullResult { metadata, .. } => Some(metadata),
}
}
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#[allow(dead_code)]
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pub fn content(&self) -> Option<&[u8]> {
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match self {
Self::FullResult { content, .. } => Some(content),
_ => None,
}
}
fn into_full(self, content: Vec<u8>) -> Option<Self> {
match self {
Self::PartialResult { uuid, metadata } => Some(Self::FullResult {
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uuid,
metadata,
content,
}),
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_ => None,
}
}
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}