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|
use sqlx::{self, ConnectOptions, Connection, Executor, Row};
use thiserror;
use crate::github;
/// Repository metadata mapped to the database.
#[derive(Debug)]
pub struct Repo {
id: i64,
name: Option<String>,
description: Option<String>,
updated_at: Option<String>,
}
impl Repo {
pub fn description(&self) -> &str {
self.description
.as_deref()
.unwrap_or("")
}
}
impl From<&github::Repo> for Repo {
fn from(repo: &github::Repo) -> Self {
Self {
id: repo.id,
name: Some(repo.name.clone()),
description: repo.description.clone(),
updated_at: Some(repo.updated_at.clone()),
}
}
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("database error")]
Db(#[from] sqlx::Error),
}
#[derive(Debug)]
pub struct Db {
connection: sqlx::SqliteConnection,
}
impl Db {
/// Open a connection to the database.
pub async fn connect(path: &str) -> Result<Self, Error> {
Ok(
Db {
connection: sqlx::sqlite::SqliteConnectOptions::new()
.filename(path)
.create_if_missing(true)
.connect()
.await?,
}
)
}
/// Initialise the database with tables and indexes.
pub async fn create(&mut self) -> Result<(), Error> {
let mut tx = self.connection.begin().await?;
tx.execute(r#"
CREATE TABLE IF NOT EXISTS repositories (
id INTEGER PRIMARY KEY,
name TEXT NOT NULL,
description TEXT,
updated_at TEXT NOT NULL
);
"#).await?;
tx.execute(r#"
CREATE UNIQUE INDEX IF NOT EXISTS idx_repositories_id
ON repositories (id);
"#).await?;
tx.commit().await?;
Ok(())
}
/// Get a repository by its ID.
///
/// Returns a `sqlx::Error::RowNotFound` error if the row doesn't exist.
pub async fn repo_get(&mut self, id: i64) -> Result<Repo, Error> {
let mut tx = self.connection.begin().await?;
let row = sqlx::query(r#"
SELECT
id,
name,
description,
updated_at
FROM repositories
WHERE id = ?
"#)
.bind(id)
.fetch_one(&mut tx)
.await?;
tx.commit().await?;
Ok(
Repo {
id: row.get(0),
name: Some(row.get(1)),
description: row.get(2),
updated_at: Some(row.get(3)),
}
)
}
/// Insert a new repository.
pub async fn repo_insert(&mut self, repo: Repo) -> Result<(), Error> {
let mut tx = self.connection.begin().await?;
sqlx::query(r#"
INSERT INTO repositories
(id, name, description, updated_at)
VALUES
(?, ?, ?, ?)
"#)
.bind(repo.id)
.bind(&repo.name)
.bind(&repo.description)
.bind(&repo.updated_at)
.execute(&mut tx)
.await?;
tx.commit().await?;
Ok(())
}
/// Check if the given repository is newer than the one in the repository.
///
/// Compares the `updated_at` field to find out whether the repository was
/// updated.
pub async fn repo_is_updated(
&mut self,
repo: &Repo,
) -> Result<bool, Error> {
let mut tx = self.connection.begin().await?;
let is_updated = match sqlx::query(r#"
SELECT 1
FROM repositories
WHERE id = ?
AND datetime(updated_at) < datetime(?)
"#)
.bind(repo.id)
.bind(&repo.updated_at)
.fetch_optional(&mut tx)
.await
{
Ok(Some(_)) => Ok(true),
Ok(None) => Ok(false),
Err(e) => Err(e.into()),
};
tx.commit().await?;
is_updated
}
/// Update an existing repository.
pub async fn repo_update(&mut self, repo: &Repo) -> Result<(), Error> {
let mut tx = self.connection.begin().await?;
sqlx::query(r#"
UPDATE repositories
SET
name = ?,
description = ?,
updated_at = ?
WHERE id = ?
"#)
.bind(&repo.name)
.bind(&repo.description)
.bind(&repo.updated_at)
.bind(repo.id)
.execute(&mut tx)
.await?;
tx.commit().await?;
Ok(())
}
}
|
