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120 lines
3.9 KiB
120 lines
3.9 KiB
use rusqlite::{Connection, ToSql, params}; |
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use serde::{Deserialize, Serialize}; |
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use std::rc::Rc; |
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use std::sync::{Arc, Mutex}; |
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use std::iter::repeat_with; |
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const ID_LENGTH: usize = 20; |
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pub type SegmentId = String; |
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#[derive(Debug, Serialize, Deserialize)] |
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pub struct Segment { |
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pub id: Option<SegmentId>, |
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pub from: u64, |
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pub to: u64, |
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} |
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// TODO: find a way to remove this unsafe |
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unsafe impl Sync for DataService {} |
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pub struct DataService { |
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connection: Arc<Mutex<Connection>>, |
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} |
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impl DataService { |
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pub fn new() -> anyhow::Result<DataService> { |
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let conn = Connection::open("./data.db")?; |
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conn.execute( |
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"CREATE TABLE IF NOT EXISTS segment ( |
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id TEXT PRIMARY KEY, |
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start INTEGER NOT NULL, |
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end INTEGER NOT NULL |
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)", |
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[], |
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)?; |
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Ok(DataService { |
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connection: Arc::new(Mutex::new(conn)), |
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}) |
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} |
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// returns id of created segment |
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pub fn insert_segment(&self, segment: &Segment) -> anyhow::Result<Segment> { |
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let id: SegmentId = repeat_with(fastrand::alphanumeric) |
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.take(ID_LENGTH) |
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.collect(); |
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// merging |
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// TODO extract intersected ids |
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// TODO: merge with other segments |
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let sgms = self.get_segments_intersected(segment.from, segment.to)?; |
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let mut min = segment.from; |
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let mut max = segment.to; |
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let mut ids_to_delete = Vec::<SegmentId>::new(); |
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for s in sgms { |
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min = min.min(s.from); |
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max = max.max(s.to); |
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ids_to_delete.push(s.id.unwrap()); |
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} |
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self.delete_segments(&ids_to_delete)?; |
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self.connection.lock().unwrap().execute( |
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"INSERT INTO segment (id, start, end) VALUES (?1, ?2, ?3)", |
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params![id, min, max], |
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)?; |
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Ok(Segment { id: Some(id), from: min, to: max }) |
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} |
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pub fn get_segments_inside(&self, from: u64, to: u64) -> anyhow::Result<Vec<Segment>> { |
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let conn = self.connection.lock().unwrap(); |
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let mut stmt = |
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conn.prepare("SELECT id, start, end FROM segment WHERE ?1 < start AND end < ?2")?; |
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let res = stmt |
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.query_map(params![from, to], |row| { |
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Ok(Segment { |
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id: row.get(0)?, |
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from: row.get(1)?, |
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to: row.get(2)?, |
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}) |
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})? |
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.map(|e| e.unwrap()) |
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.collect(); |
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Ok(res) |
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} |
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pub fn get_segments_intersected(&self, from: u64, to: u64) -> anyhow::Result<Vec<Segment>> { |
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let conn = self.connection.lock().unwrap(); |
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let mut stmt = conn.prepare("SELECT id, start, end FROM segment |
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WHERE (start <= ?1 and ?1 <= end) OR |
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(start <= ?2 AND ?2 <= end) OR |
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(?1 <= start AND start <= ?2) OR |
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(?1 <= end AND end <= ?2) ")?; |
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let res = stmt |
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.query_map(params![from, to], |row| { |
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Ok(Segment { |
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id: row.get(0)?, |
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from: row.get(1)?, |
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to: row.get(2)?, |
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}) |
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})? |
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.map(|e| e.unwrap()) |
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.collect(); |
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Ok(res) |
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} |
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pub fn delete_segments(&self, ids: &Vec<SegmentId>) -> anyhow::Result<usize> { |
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// TODO: here could be sql injection if you substitute id with string :) |
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let conn = self.connection.lock().unwrap(); |
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let ids_comma = ids.iter().map(|id| "\"".to_string() + id + "\"").collect::<Vec<String>>().join(","); |
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let query_str = format!("DELETE FROM segment WHERE id in ({})", ids_comma); |
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let mut stmt = conn.prepare(&query_str)?; |
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let res = stmt.execute([])?; |
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Ok(res) |
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} |
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} |
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