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use crate::cache::cache_filter_engine::FirestoreCacheFilterEngine;
use crate::*;
use futures::stream::BoxStream;
use futures::stream::StreamExt;
use futures::{future, TryStreamExt};
use std::cmp::Ordering;
#[derive(Clone)]
pub struct FirestoreCacheQueryEngine {
pub query: FirestoreQueryParams,
}
impl FirestoreCacheQueryEngine {
pub fn new(query: &FirestoreQueryParams) -> Self {
Self {
query: query.clone(),
}
}
pub fn params_supported(&self) -> bool {
self.query.all_descendants.iter().all(|x| !*x)
}
pub fn matches_doc(&self, doc: &FirestoreDocument) -> bool {
if let Some(filter) = &self.query.filter {
let filter_engine = FirestoreCacheFilterEngine::new(filter);
filter_engine.matches_doc(doc)
} else {
true
}
}
pub async fn sort_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
if let Some(order_by) = &self.query.order_by {
let mut collected: Vec<FirestoreDocument> = input.try_collect().await?;
collected.sort_by(|doc_a, doc_b| {
let mut current_ordering = Ordering::Equal;
for sort_field in order_by {
match (
firestore_doc_get_field_by_path(doc_a, &sort_field.field_name),
firestore_doc_get_field_by_path(doc_b, &sort_field.field_name),
) {
(Some(field_a), Some(field_b)) => {
if cache::cache_filter_engine::compare_values(
cache::cache_filter_engine::CompareOp::Equal,
field_a,
field_b,
) {
continue;
}
if cache::cache_filter_engine::compare_values(
cache::cache_filter_engine::CompareOp::LessThan,
field_a,
field_b,
) {
current_ordering = match sort_field.direction {
FirestoreQueryDirection::Ascending => Ordering::Less,
FirestoreQueryDirection::Descending => Ordering::Greater,
}
} else {
current_ordering = match sort_field.direction {
FirestoreQueryDirection::Ascending => Ordering::Greater,
FirestoreQueryDirection::Descending => Ordering::Less,
}
}
}
(None, None) => current_ordering = Ordering::Equal,
(None, Some(_)) => current_ordering = Ordering::Equal,
(Some(_), None) => current_ordering = Ordering::Equal,
}
}
current_ordering
});
Ok(futures::stream::iter(collected.into_iter().map(Ok)).boxed())
} else {
Ok(input)
}
}
pub async fn limit_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
if let Some(limit) = self.query.limit {
Ok(input
.scan(0_u32, move |index, doc| {
if *index < limit {
*index += 1;
future::ready(Some(doc))
} else {
future::ready(None)
}
})
.boxed())
} else {
Ok(input)
}
}
pub async fn offset_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
if let Some(offset) = self.query.offset {
Ok(input.skip(offset as usize).boxed())
} else {
Ok(input)
}
}
pub async fn start_at_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
if let Some(start_at) = &self.query.start_at {
if let Some(order_by) = &self.query.order_by {
let start_at = start_at.clone();
let order_by = order_by.clone();
Ok(input
.skip_while(move |doc_res| match doc_res {
Ok(doc) => match &start_at {
FirestoreQueryCursor::BeforeValue(values) => {
let result = values.iter().zip(&order_by).any(
|(value, ordered_field)| {
let order_by_comp = match ordered_field.direction {
FirestoreQueryDirection::Ascending => cache::cache_filter_engine::CompareOp::LessThan,
FirestoreQueryDirection::Descending => cache::cache_filter_engine::CompareOp::GreaterThan
};
match (
firestore_doc_get_field_by_path(
doc,
&ordered_field.field_name,
),
&value.value.value_type,
) {
(Some(field_a), Some(field_b)) => {
cache::cache_filter_engine::compare_values(
order_by_comp,
field_a,
field_b,
)
}
(_, _) => false,
}
},
);
future::ready(result)
}
FirestoreQueryCursor::AfterValue(values) => {
let result = values.iter().zip(&order_by).any(
|(value, ordered_field)| {
let order_by_comp = match ordered_field.direction {
FirestoreQueryDirection::Ascending => cache::cache_filter_engine::CompareOp::LessThanOrEqual,
FirestoreQueryDirection::Descending => cache::cache_filter_engine::CompareOp::GreaterThanOrEqual
};
match (
firestore_doc_get_field_by_path(
doc,
&ordered_field.field_name,
),
&value.value.value_type,
) {
(Some(field_a), Some(field_b)) => {
cache::cache_filter_engine::compare_values(
order_by_comp,
field_a,
field_b,
)
}
(_, _) => false,
}
},
);
future::ready(result)
}
},
Err(_) => future::ready(false),
})
.boxed())
} else {
Ok(input)
}
} else {
Ok(input)
}
}
pub async fn end_at_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
if let Some(end_at) = &self.query.end_at {
if let Some(order_by) = &self.query.order_by {
let end_at = end_at.clone();
let order_by = order_by.clone();
Ok(input
.take_while(move |doc_res| match doc_res {
Ok(doc) => match &end_at {
FirestoreQueryCursor::BeforeValue(values) => {
let result = values.iter().zip(&order_by).any(
|(value, ordered_field)| {
let order_by_comp = match ordered_field.direction {
FirestoreQueryDirection::Ascending => cache::cache_filter_engine::CompareOp::LessThan,
FirestoreQueryDirection::Descending => cache::cache_filter_engine::CompareOp::GreaterThan
};
match (
firestore_doc_get_field_by_path(
doc,
&ordered_field.field_name,
),
&value.value.value_type,
) {
(Some(field_a), Some(field_b)) => {
cache::cache_filter_engine::compare_values(
order_by_comp,
field_a,
field_b,
)
}
(_, _) => false,
}
},
);
future::ready(result)
}
FirestoreQueryCursor::AfterValue(values) => {
let result = values.iter().zip(&order_by).any(
|(value, ordered_field)| {
let order_by_comp = match ordered_field.direction {
FirestoreQueryDirection::Ascending => cache::cache_filter_engine::CompareOp::LessThanOrEqual,
FirestoreQueryDirection::Descending => cache::cache_filter_engine::CompareOp::GreaterThanOrEqual
};
match (
firestore_doc_get_field_by_path(
doc,
&ordered_field.field_name,
),
&value.value.value_type,
) {
(Some(field_a), Some(field_b)) => {
cache::cache_filter_engine::compare_values(
order_by_comp,
field_a,
field_b,
)
}
(_, _) => false,
}
},
);
future::ready(result)
}
},
Err(_) => future::ready(false),
})
.boxed())
} else {
Ok(input)
}
} else {
Ok(input)
}
}
pub async fn process_query_stream<'a, 'b>(
&'a self,
input: BoxStream<'b, FirestoreResult<FirestoreDocument>>,
) -> FirestoreResult<BoxStream<'b, FirestoreResult<FirestoreDocument>>> {
let input = self.sort_stream(input).await?;
let input = self.limit_stream(input).await?;
let input = self.offset_stream(input).await?;
let input = self.start_at_stream(input).await?;
let input = self.end_at_stream(input).await?;
Ok(input)
}
}