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use rusqlite::{params, Connection, ToSql};
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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 {
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id: Some(id),
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from: min,
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to: max,
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})
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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(
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"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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)?;
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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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if ids.len() == 0 {
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return Ok(0);
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}
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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
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.iter()
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.map(|id| "\"".to_string() + id + "\"")
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.collect::<Vec<String>>()
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.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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