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use std::collections::BTreeMap;
use futures::StreamExt;
use futures::TryStreamExt;
use tokio_stream::wrappers::ReceiverStream;
use tonic::Status;
use crate::input::source::BucketSource;
#[tonic::async_trait]
pub trait MemSource: Sync + Send + 'static {
type Bucket: Send + Sync + Ord + Clone;
type K: Send + Sync + Ord;
type V: Send + Sync;
async fn get_all_by_bucket(
&self,
b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status>;
}
#[tonic::async_trait]
impl<B> MemSource for B
where
B: BucketSource,
B::Bucket: Clone + Ord,
B::K: Ord,
{
type Bucket = B::Bucket;
type K = B::K;
type V = B::V;
async fn get_all_by_bucket(
&self,
b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status> {
let rows: B::All = BucketSource::get_all_by_bucket(self, b).await?;
rows.try_fold(BTreeMap::new(), |mut m, pair| async move {
let (key, val) = pair;
m.insert(key, val);
Ok(m)
})
.await
}
}
pub fn mem_src_new<B>(bsrc: B) -> impl MemSource<Bucket = B::Bucket, K = B::K, V = B::V>
where
B: BucketSource,
B::Bucket: Clone + Ord,
B::K: Ord,
{
bsrc
}
pub trait Merger: Sync + Send + 'static {
type Bucket: Send + Sync + Ord + Clone;
type K: Send + Sync + Ord;
type T: Send + Sync;
type U: Send + Sync;
fn merge(
&self,
key: Self::K,
inputs: &BTreeMap<Self::Bucket, BTreeMap<Self::K, Self::T>>,
) -> Result<Self::U, Status>;
}
pub trait Grouper: Sync + Send + 'static {
type BucketI: Send + Sync + Ord;
type BucketO: Send + Sync + Ord + Clone;
type K: Send + Sync + Ord;
type T: Send + Sync;
fn conv(&self, i: &Self::BucketI, t: &Self::T) -> Result<(Self::BucketO, Self::T), Status>;
fn group(
&self,
key: Self::K,
inputs: &BTreeMap<Self::BucketI, BTreeMap<Self::K, Self::T>>,
) -> Result<BTreeMap<Self::BucketO, Self::T>, Status> {
inputs.keys().try_fold(BTreeMap::new(), |mut m, bi| {
let kt: &BTreeMap<Self::K, Self::T> = inputs
.get(bi)
.ok_or_else(|| Status::invalid_argument("map for a bucket not found"))?;
let ot: Option<&Self::T> = kt.get(&key);
let op: Option<_> = match ot {
None => None,
Some(t) => Some(self.conv(bi, t)?),
};
match op {
None => Ok(m),
Some(pair) => {
let (bo, t) = pair;
m.insert(bo, t);
Ok(m)
}
}
})
}
}
impl<G> Merger for G
where
G: Grouper,
G::BucketI: Clone,
{
type Bucket = <G as Grouper>::BucketI;
type K = <G as Grouper>::K;
type T = <G as Grouper>::T;
type U = BTreeMap<<G as Grouper>::BucketO, Self::T>;
fn merge(
&self,
key: Self::K,
inputs: &BTreeMap<Self::Bucket, BTreeMap<Self::K, Self::T>>,
) -> Result<Self::U, Status> {
self.group(key, inputs)
}
}
pub struct MergedSource<M, S> {
merger: M,
source: S,
}
#[tonic::async_trait]
impl<M, S> BucketSource for MergedSource<M, S>
where
M: Merger + Clone,
S::K: Clone,
S: MemSource<Bucket = M::Bucket, K = M::K, V = M::T>,
{
type Bucket = (Vec<S::K>, Vec<S::Bucket>);
type K = S::K;
type V = M::U;
type All = ReceiverStream<Result<(Self::K, Self::V), Status>>;
async fn get_all_by_bucket(&self, b: Self::Bucket) -> Result<Self::All, Status> {
let (keys, buckets) = b;
let bs = futures::stream::iter(buckets).map(Ok::<_, Status>);
let bmap: BTreeMap<S::Bucket, BTreeMap<S::K, S::V>> = bs
.try_fold(BTreeMap::new(), |mut m, bkt| async move {
let bkv: BTreeMap<S::K, S::V> = self.source.get_all_by_bucket(bkt.clone()).await?;
m.insert(bkt, bkv);
Ok(m)
})
.await?;
let (tx, rx) = tokio::sync::mpsc::channel(1);
let mc: M = self.merger.clone();
tokio::spawn(async move {
let rt = &tx;
let rb: &BTreeMap<_, _> = &bmap;
let ks = futures::stream::iter(keys);
let mr: &M = &mc;
let mapd = ks.map(|k: S::K| {
let ru = mr.merge(k.clone(), rb);
ru.map(|u: Self::V| (k, u))
});
let _cnt: u64 = mapd
.fold(0, |tot, rslt| async move {
rt.send(rslt).await.map(|_| 1 + tot).unwrap_or(tot)
})
.await;
});
Ok(ReceiverStream::new(rx))
}
}
pub fn merged_src_new<M, S>(
merger: M,
source: S,
) -> impl BucketSource<Bucket = (Vec<S::K>, Vec<S::Bucket>), K = S::K, V = M::U>
where
M: Merger + Clone,
S::K: Clone,
S: MemSource<Bucket = M::Bucket, K = M::K, V = M::T>,
{
MergedSource { merger, source }
}
pub fn grouped_src_new<G, S>(
grouper: G,
source: S,
) -> impl BucketSource<Bucket = (Vec<S::K>, Vec<S::Bucket>), K = S::K, V = BTreeMap<G::BucketO, G::T>>
where
G: Grouper + Clone,
G::BucketI: Clone,
S::K: Clone,
S: MemSource<Bucket = G::BucketI, K = G::K, V = G::T>,
{
let merger = grouper;
MergedSource { merger, source }
}
#[cfg(test)]
mod test_btree {
mod merged_src_new {
mod empty {
use std::collections::BTreeMap;
use futures::StreamExt;
use tonic::Status;
use crate::input::source::BucketSource;
use crate::input::join::mem::btree::{MemSource, Merger};
#[derive(Clone)]
struct M {}
impl Merger for M {
type Bucket = String;
type K = i64;
type T = String;
type U = (String, i64, BTreeMap<String, String>);
fn merge(
&self,
_key: Self::K,
_inputs: &BTreeMap<Self::Bucket, BTreeMap<Self::K, Self::T>>,
) -> Result<Self::U, Status> {
unimplemented!()
}
}
struct S {}
#[tonic::async_trait]
impl MemSource for S {
type Bucket = String;
type K = i64;
type V = String;
async fn get_all_by_bucket(
&self,
_b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status> {
Ok(BTreeMap::new())
}
}
#[tokio::test]
async fn ensure_empty() {
let mgr = M {};
let src = S {};
let bs = crate::input::join::mem::btree::merged_src_new(mgr, src);
let bkt = (vec![], vec![]);
let got = BucketSource::get_all_by_bucket(&bs, bkt).await.unwrap();
let cnt: usize = got.count().await;
assert_eq!(0, cnt);
}
}
mod week {
/*
table A: tue_2023_12_19
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 42 |
| banana | 11 | 49 |
| candy | 11 | 49 |
| apple | 12 | 47 |
| banana | 12 | 49 |
| candy | 12 | 42 |
| apple | 13 | 44 |
| banana | 13 | 45 |
| candy | 13 | 48 |
table B: mon_2023_12_18
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 634 |
| banana | 11 | 614 |
| candy | 11 | 644 |
| apple | 12 | 614 |
| banana | 12 | 654 |
| candy | 12 | 694 |
| apple | 13 | 624 |
| banana | 13 | 664 |
| candy | 13 | 654 |
table C: sun_2023_12_17
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 333 |
| banana | 11 | 331 |
| candy | 11 | 334 |
| apple | 12 | 331 |
| banana | 12 | 335 |
| candy | 12 | 339 |
| apple | 13 | 332 |
| banana | 13 | 336 |
| candy | 13 | 335 |
merged table
| item type | hour | value |
|:---------:|:----:|:------------------------:|
| apple | 11 | sun:333, mon:634, tue:42 |
| banana | 11 | sun:331, mon:614, tue:49 |
| candy | 11 | sun:334, mon:644, tue:49 |
| apple | 12 | sun:331, mon:614, tue:47 |
| banana | 12 | sun:335, mon:654, tue:49 |
| candy | 12 | sun:339, mon:694, tue:42 |
| apple | 13 | sun:332, mon:624, tue:44 |
| banana | 13 | sun:336, mon:664, tue:45 |
| candy | 13 | sun:335, mon:654, tue:48 |
*/
use std::collections::BTreeMap;
use futures::StreamExt;
use tonic::Status;
use crate::input::source::BucketSource;
use crate::input::join::mem::btree::{MemSource, Merger};
#[derive(Clone)]
struct M {}
impl Merger for M {
type Bucket = (&'static str, String); // e.g, ("tue", "2023/12/19")
type K = (String, u8); // e.g, ("apple", 11)
type T = (i64, f64); // e.g, (42, 3.0)
type U = BTreeMap<&'static str, Self::T>;
fn merge(
&self,
key: Self::K,
inputs: &BTreeMap<Self::Bucket, BTreeMap<Self::K, Self::T>>,
) -> Result<Self::U, Status> {
let keys = inputs.keys();
Ok(keys.fold(BTreeMap::new(), |mut m, bkt| {
let week: &str = bkt.0;
let om: Option<&BTreeMap<Self::K, _>> = inputs.get(&bkt);
let ot: Option<Self::T> = om.and_then(|b| b.get(&key)).copied();
match ot {
None => m,
Some(t) => {
m.insert(week, t);
m
}
}
}))
}
}
#[derive(Default)]
struct S {
internal: BTreeMap<(&'static str, String), BTreeMap<(String, u8), (i64, f64)>>,
}
#[tonic::async_trait]
impl MemSource for S {
type Bucket = (&'static str, String);
type K = (String, u8); // e.g, ("apple", 11)
type V = (i64, f64); // e.g, (42, 3.0)
async fn get_all_by_bucket(
&self,
b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status> {
self.internal
.get(&b)
.cloned()
.ok_or_else(|| Status::not_found(format!("no such bucket: {}", b.0)))
}
}
#[tokio::test]
async fn week_test() {
let m: M = M {};
let mut s: S = S::default();
s.internal = BTreeMap::from_iter(vec![
(
("sun", "2023/12/17".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (42, 3.0)),
(("banana".into(), 11), (49, 1.0)),
(("candy".into(), 11), (49, 4.0)),
(("apple".into(), 12), (47, 1.0)),
(("banana".into(), 12), (49, 5.0)),
(("candy".into(), 12), (42, 9.0)),
(("apple".into(), 13), (44, 2.0)),
(("banana".into(), 13), (45, 6.0)),
(("candy".into(), 13), (48, 5.0)),
]),
),
(
("mon", "2023/12/18".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (634, 3.0)),
(("banana".into(), 11), (614, 1.0)),
(("candy".into(), 11), (644, 4.0)),
(("apple".into(), 12), (614, 1.0)),
(("banana".into(), 12), (654, 5.0)),
(("candy".into(), 12), (694, 9.0)),
(("apple".into(), 13), (624, 2.0)),
(("banana".into(), 13), (664, 6.0)),
(("candy".into(), 13), (654, 5.0)),
]),
),
(
("tue", "2023/12/19".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (333, 3.0)),
(("banana".into(), 11), (331, 1.0)),
(("candy".into(), 11), (334, 4.0)),
(("apple".into(), 12), (331, 1.0)),
(("banana".into(), 12), (335, 5.0)),
(("candy".into(), 12), (339, 9.0)),
(("apple".into(), 13), (332, 2.0)),
(("banana".into(), 13), (336, 6.0)),
(("candy".into(), 13), (335, 5.0)),
]),
),
]);
let bs = crate::input::join::mem::btree::merged_src_new(m, s);
let bkt = (
vec![
("apple".into(), 11),
("apple".into(), 12),
("apple".into(), 13),
("candy".into(), 11),
("candy".into(), 12),
("candy".into(), 13),
],
vec![
("sun", "2023/12/17".into()),
("mon", "2023/12/18".into()),
("tue", "2023/12/19".into()),
],
);
let got = BucketSource::get_all_by_bucket(&bs, bkt).await.unwrap();
let folded: Vec<_> = got
.fold(vec![], |mut v, rslt| async move {
v.push(rslt.unwrap());
v
})
.await;
let mut i = folded.into_iter();
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 11), itm.0);
assert_eq!(&(42, 3.0), itm.1.get("sun").unwrap());
assert_eq!(&(634, 3.0), itm.1.get("mon").unwrap());
assert_eq!(&(333, 3.0), itm.1.get("tue").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 12), itm.0);
assert_eq!(&(47, 1.0), itm.1.get("sun").unwrap());
assert_eq!(&(614, 1.0), itm.1.get("mon").unwrap());
assert_eq!(&(331, 1.0), itm.1.get("tue").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 13), itm.0);
assert_eq!(&(44, 2.0), itm.1.get("sun").unwrap());
assert_eq!(&(624, 2.0), itm.1.get("mon").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("candy".into(), 11), itm.0);
assert_eq!(&(49, 4.0), itm.1.get("sun").unwrap());
assert_eq!(&(644, 4.0), itm.1.get("mon").unwrap());
assert_eq!(&(334, 4.0), itm.1.get("tue").unwrap());
}
}
}
mod grouped_src_new {
mod empty {
use std::collections::BTreeMap;
use futures::StreamExt;
use tonic::Status;
use crate::input::source::BucketSource;
use crate::input::join::mem::btree::{Grouper, MemSource};
#[derive(Clone)]
struct G {}
impl Grouper for G {
type BucketI = (u64, String);
type BucketO = u64;
type K = i64;
type T = (i32, f64);
fn conv(
&self,
_i: &Self::BucketI,
_t: &Self::T,
) -> Result<(Self::BucketO, Self::T), Status> {
unimplemented!()
}
}
struct S {}
#[tonic::async_trait]
impl MemSource for S {
type Bucket = (u64, String);
type K = i64;
type V = (i32, f64);
async fn get_all_by_bucket(
&self,
_b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status> {
Ok(BTreeMap::new())
}
}
#[tokio::test]
async fn ensure_empty() {
let g: G = G {};
let s: S = S {};
let bs = crate::input::join::mem::btree::grouped_src_new(g, s);
let bkt = (vec![], vec![]);
let rslt = BucketSource::get_all_by_bucket(&bs, bkt).await.unwrap();
let cnt: usize = rslt.count().await;
assert_eq!(0, cnt);
}
}
mod week {
/*
table A: tue_2023_12_19
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 42 |
| banana | 11 | 49 |
| candy | 11 | 49 |
| apple | 12 | 47 |
| banana | 12 | 49 |
| candy | 12 | 42 |
| apple | 13 | 44 |
| banana | 13 | 45 |
| candy | 13 | 48 |
table B: mon_2023_12_18
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 634 |
| banana | 11 | 614 |
| candy | 11 | 644 |
| apple | 12 | 614 |
| banana | 12 | 654 |
| candy | 12 | 694 |
| apple | 13 | 624 |
| banana | 13 | 664 |
| candy | 13 | 654 |
table C: sun_2023_12_17
| item type | hour | cnt |
|:---------:|:----:|:---:|
| apple | 11 | 333 |
| banana | 11 | 331 |
| candy | 11 | 334 |
| apple | 12 | 331 |
| banana | 12 | 335 |
| candy | 12 | 339 |
| apple | 13 | 332 |
| banana | 13 | 336 |
| candy | 13 | 335 |
merged table
| item type | hour | value |
|:---------:|:----:|:------------------------:|
| apple | 11 | sun:333, mon:634, tue:42 |
| banana | 11 | sun:331, mon:614, tue:49 |
| candy | 11 | sun:334, mon:644, tue:49 |
| apple | 12 | sun:331, mon:614, tue:47 |
| banana | 12 | sun:335, mon:654, tue:49 |
| candy | 12 | sun:339, mon:694, tue:42 |
| apple | 13 | sun:332, mon:624, tue:44 |
| banana | 13 | sun:336, mon:664, tue:45 |
| candy | 13 | sun:335, mon:654, tue:48 |
*/
use std::collections::BTreeMap;
use futures::StreamExt;
use tonic::Status;
use crate::input::source::BucketSource;
use crate::input::join::mem::btree::{Grouper, MemSource};
#[derive(Clone)]
struct G {}
impl Grouper for G {
type BucketI = (&'static str, String); // e.g, ("tue", "2023/12/19")
type BucketO = &'static str; // e.g, "tue"
type K = (String, u8); // e.g, ("apple", 11)
type T = (i64, f64); // e.g, (42, 3.0)
fn conv(
&self,
i: &Self::BucketI,
t: &Self::T,
) -> Result<(Self::BucketO, Self::T), Status> {
let wk: &str = i.0;
Ok((wk, *t))
}
}
#[derive(Default)]
struct S {
internal: BTreeMap<(&'static str, String), BTreeMap<(String, u8), (i64, f64)>>,
}
#[tonic::async_trait]
impl MemSource for S {
type Bucket = (&'static str, String);
type K = (String, u8); // e.g, ("apple", 11)
type V = (i64, f64); // e.g, (42, 3.0)
async fn get_all_by_bucket(
&self,
b: Self::Bucket,
) -> Result<BTreeMap<Self::K, Self::V>, Status> {
self.internal
.get(&b)
.cloned()
.ok_or_else(|| Status::not_found(format!("no such bucket: {}", b.0)))
}
}
#[tokio::test]
async fn week_test() {
let g: G = G {};
let mut s: S = S::default();
s.internal = BTreeMap::from_iter(vec![
(
("sun", "2023/12/17".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (42, 3.0)),
(("banana".into(), 11), (49, 1.0)),
(("candy".into(), 11), (49, 4.0)),
(("apple".into(), 12), (47, 1.0)),
(("banana".into(), 12), (49, 5.0)),
(("candy".into(), 12), (42, 9.0)),
(("apple".into(), 13), (44, 2.0)),
(("banana".into(), 13), (45, 6.0)),
(("candy".into(), 13), (48, 5.0)),
]),
),
(
("mon", "2023/12/18".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (634, 3.0)),
(("banana".into(), 11), (614, 1.0)),
(("candy".into(), 11), (644, 4.0)),
(("apple".into(), 12), (614, 1.0)),
(("banana".into(), 12), (654, 5.0)),
(("candy".into(), 12), (694, 9.0)),
(("apple".into(), 13), (624, 2.0)),
(("banana".into(), 13), (664, 6.0)),
(("candy".into(), 13), (654, 5.0)),
]),
),
(
("tue", "2023/12/19".into()),
BTreeMap::from_iter(vec![
(("apple".into(), 11), (333, 3.0)),
(("banana".into(), 11), (331, 1.0)),
(("candy".into(), 11), (334, 4.0)),
(("apple".into(), 12), (331, 1.0)),
(("banana".into(), 12), (335, 5.0)),
(("candy".into(), 12), (339, 9.0)),
(("apple".into(), 13), (332, 2.0)),
(("banana".into(), 13), (336, 6.0)),
(("candy".into(), 13), (335, 5.0)),
]),
),
]);
let bs = crate::input::join::mem::btree::grouped_src_new(g, s);
let bkt = (
vec![
("apple".into(), 11),
("apple".into(), 12),
("apple".into(), 13),
("candy".into(), 11),
("candy".into(), 12),
("candy".into(), 13),
],
vec![
("sun", "2023/12/17".into()),
("mon", "2023/12/18".into()),
("tue", "2023/12/19".into()),
],
);
let got = BucketSource::get_all_by_bucket(&bs, bkt).await.unwrap();
let folded: Vec<_> = got
.fold(vec![], |mut v, rslt| async move {
v.push(rslt.unwrap());
v
})
.await;
let mut i = folded.into_iter();
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 11), itm.0);
assert_eq!(&(42, 3.0), itm.1.get("sun").unwrap());
assert_eq!(&(634, 3.0), itm.1.get("mon").unwrap());
assert_eq!(&(333, 3.0), itm.1.get("tue").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 12), itm.0);
assert_eq!(&(47, 1.0), itm.1.get("sun").unwrap());
assert_eq!(&(614, 1.0), itm.1.get("mon").unwrap());
assert_eq!(&(331, 1.0), itm.1.get("tue").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("apple".into(), 13), itm.0);
assert_eq!(&(44, 2.0), itm.1.get("sun").unwrap());
assert_eq!(&(624, 2.0), itm.1.get("mon").unwrap());
let itm: ((String, u8), BTreeMap<&str, (i64, f64)>) = i.next().unwrap();
assert_eq!(("candy".into(), 11), itm.0);
assert_eq!(&(49, 4.0), itm.1.get("sun").unwrap());
assert_eq!(&(644, 4.0), itm.1.get("mon").unwrap());
assert_eq!(&(334, 4.0), itm.1.get("tue").unwrap());
}
}
}
}