192 lines
6.2 KiB
Rust
192 lines
6.2 KiB
Rust
#[macro_use]
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extern crate diesel;
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use std::io::Read;
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use std::fs::read_to_string;
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use std::sync::RwLock;
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use std::collections::VecDeque;
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use chrono::offset::Utc;
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use reqwest::header::{IF_NONE_MATCH, IF_MODIFIED_SINCE, ETAG, LAST_MODIFIED, USER_AGENT};
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use diesel::{Connection, pg::PgConnection, prelude::*};
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mod config;
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use config::{Config, CalendarOptions};
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mod schema;
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use schema::{calendars::dsl::calendars, events};
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mod model;
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use model::{Calendar, NewCalendar};
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mod ics;
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use ics::Parser;
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pub struct Resources {
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db_url: String,
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http_client: reqwest::Client,
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queue: RwLock<VecDeque<(String, CalendarOptions)>>,
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}
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impl Resources {
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pub fn new(db_url: String, queue: VecDeque<(String, CalendarOptions)>) -> Self {
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let http_client = reqwest::Client::new();
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let queue = RwLock::new(queue);
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Resources { db_url, http_client, queue }
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}
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fn next(&self) -> Option<(String, CalendarOptions)> {
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let mut queue = self.queue.write().unwrap();
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queue.pop_front()
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}
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fn worker(&self) -> Result<(), Error> {
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let db = PgConnection::establish(&self.db_url)?;
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loop {
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let (id, cal_opts) = match self.next() {
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Some(next) => next,
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None => return Ok(()),
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};
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let (etag, last_modified) = db.transaction::<_, Error, _>(|| {
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let cals = calendars
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.filter(schema::calendars::dsl::id.eq(id.clone()))
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.limit(1)
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.load::<Calendar>(&db)?;
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match cals.first() {
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None => {
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let cal = NewCalendar {
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id: id.clone(),
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url: cal_opts.url.clone(),
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last_fetch: Some(Utc::now().naive_utc()),
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};
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diesel::insert_into(calendars)
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.values(&cal)
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.execute(&db)?;
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Ok((None, None))
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}
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Some(cal) => {
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diesel::update(calendars)
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.filter(schema::calendars::dsl::id.eq(id.clone()))
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.set(schema::calendars::dsl::last_fetch.eq(Utc::now().naive_utc()))
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.execute(&db)?;
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Ok((cal.etag.clone(), cal.last_modified.clone()))
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}
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}
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})?;
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let mut req = self.http_client.get(&cal_opts.url)
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.header(USER_AGENT, "Ticker/0.0.0");
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match etag {
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Some(etag) => req = req.header(IF_NONE_MATCH, etag),
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None => (),
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}
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match last_modified {
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Some(last_modified) => req = req.header(IF_MODIFIED_SINCE, last_modified),
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None => (),
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}
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let mut res = req.send()?;
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println!("{} {}", res.status(), cal_opts.url);
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if res.status() != 200 {
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let msg = format!("HTTP {}", res.status());
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diesel::update(calendars)
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.filter(schema::calendars::dsl::id.eq(id.clone()))
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.set((schema::calendars::dsl::last_success.eq(Utc::now().naive_utc()),
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schema::calendars::dsl::error_message.eq(msg)))
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.execute(&db)?;
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return Ok(())
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}
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let etag = res.headers().get(ETAG)
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.and_then(|v| v.to_str().ok())
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.map(|s| s.to_owned());
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let last_modified = res.headers().get(LAST_MODIFIED)
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.and_then(|v| v.to_str().ok())
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.map(|s| s.to_owned());
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db.transaction::<_, Error, _>(|| {
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diesel::update(calendars)
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.filter(schema::calendars::dsl::id.eq(id.clone()))
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.set((schema::calendars::dsl::last_success.eq(Utc::now().naive_utc()),
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schema::calendars::dsl::etag.eq(etag),
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schema::calendars::dsl::last_modified.eq(last_modified)))
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.execute(&db)?;
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let mut p = Parser::new();
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let mut buf = [0; 1024];
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loop {
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match res.read(&mut buf)? {
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len if len > 0 => {
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let data = &buf[..len];
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p.feed(data, |obj| {
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println!("- [{}] {}", obj.get("DTSTART").unwrap_or("?"), obj.get("SUMMARY").unwrap_or("?"));
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print!(" {}", obj.get("LOCATION").unwrap_or("?"));
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obj.get("URL").map(|url| print!(" <{}>", url));
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println!("");
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});
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}
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_ => break,
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}
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}
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Ok(())
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})?;
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}
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}
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}
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#[derive(Debug)]
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pub enum Error {
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DbConnection(diesel::ConnectionError),
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Db(diesel::result::Error),
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Http(reqwest::Error),
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Io(std::io::Error),
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}
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impl From<diesel::ConnectionError> for Error {
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fn from(e: diesel::ConnectionError) -> Self {
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Error::DbConnection(e)
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}
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}
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impl From<diesel::result::Error> for Error {
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fn from(e: diesel::result::Error) -> Self {
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Error::Db(e)
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}
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}
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impl From<reqwest::Error> for Error {
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fn from(e: reqwest::Error) -> Self {
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Error::Http(e)
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}
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}
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impl From<std::io::Error> for Error {
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fn from(e: std::io::Error) -> Self {
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Error::Io(e)
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}
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}
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fn main() {
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let config_file = read_to_string("config.yaml")
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.expect("config.yaml");
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let config: Config = serde_yaml::from_str(&config_file)
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.expect("config");
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let res = Resources::new(
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config.db_url,
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config.calendars.into_iter()
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.collect()
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);
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crossbeam::scope(|s| {
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let cpus = num_cpus::get();
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let workers: Vec<_> = (0..cpus)
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.map(|_| s.spawn(|_| {
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res.worker()
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.map_err(|e| println!("{:?}", e))
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}))
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.collect();
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for worker in workers.into_iter() {
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worker.join().expect("worker").unwrap();
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}
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}).unwrap();
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}
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