Web-based Calendar Aggregator https://ticker.c3d2.de/
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use std::io::Read;
use std::fs::read_to_string;
use std::sync::{Mutex, RwLock};
use std::collections::VecDeque;
use rustorm::{pool::Pool, DbError};
use chrono::offset::Utc;
use reqwest::header::{IF_NONE_MATCH, IF_MODIFIED_SINCE, ETAG, LAST_MODIFIED, USER_AGENT};
mod config;
use config::{Config, CalendarOptions};
mod schema;
use schema::{new, Calendar, Event};
mod transaction;
use transaction::{Transaction, QuerySql};
mod ics;
use ics::Parser;
pub struct Resources {
db_pool: Mutex<Pool>,
db_url: String,
http_client: reqwest::Client,
queue: RwLock<VecDeque<(String, CalendarOptions)>>,
}
impl Resources {
pub fn new(db_url: String, queue: VecDeque<(String, CalendarOptions)>) -> Self {
let db_pool = Mutex::new(Pool::new());
let http_client = reqwest::Client::new();
let queue = RwLock::new(queue);
Resources { db_pool, db_url, http_client, queue }
}
fn transaction(&self) -> Result<Transaction, DbError> {
let em = self.db_pool.lock()
.unwrap()
.em(&self.db_url)?;
Transaction::new(em)
}
fn next(&self) -> Option<(String, CalendarOptions)> {
let mut queue = self.queue.write().unwrap();
queue.pop_front()
}
fn worker(&self) -> Result<(), Error> {
let (id, cal_opts) = match self.next() {
Some(next) => next,
None => return Ok(()),
};
let (etag, last_modified) = {
let tx = self.transaction()?;
let cal: Option<Calendar> =
tx.query("SELECT * FROM calendar WHERE id=$1", &[&id])?;
let result = match cal {
None => {
tx.insert(&[&new::Calendar {
id: id.clone(),
url: cal_opts.url.clone(),
last_fetch: Utc::now(),
}])?;
(None, None)
}
Some(cal) => {
tx.exec("UPDATE calendar SET last_fetch=$2 WHERE id=$1", &[&id, &Utc::now()])?;
(cal.etag, cal.last_modified)
}
};
tx.commit()?;
result
};
let mut req = self.http_client.get(&cal_opts.url)
.header(USER_AGENT, "Ticker/0.0.0");
match etag {
Some(etag) => req = req.header(IF_NONE_MATCH, etag),
None => (),
}
match last_modified {
Some(last_modified) => req = req.header(IF_MODIFIED_SINCE, last_modified),
None => (),
}
let mut res = req.send()?;
println!("{} {}", res.status(), cal_opts.url);
if res.status() != 200 {
let tx = self.transaction()?;
let msg = format!("HTTP {}", res.status());
tx.exec("UPDATE calendar SET last_success=$2, error_message=$3 WHERE id=$1", &[&id, &Utc::now(), &msg])?;
tx.commit()?;
return Ok(())
}
let etag = res.headers().get(ETAG)
.and_then(|v| v.to_str().ok());
let last_modified = res.headers().get(LAST_MODIFIED)
.and_then(|v| v.to_str().ok());
let tx = self.transaction()?;
tx.exec("UPDATE calendar SET last_success=$2, error_message=NULL, etag=$3, last_modified=$4 WHERE id=$1", &[&id, &Utc::now(), &etag, &last_modified])?;
let mut p = Parser::new();
let mut buf = [0; 1024];
loop {
match res.read(&mut buf)? {
len if len > 0 => {
let data = &buf[..len];
p.feed(data, |obj| {
println!("- [{}] {}", obj.get("DTSTART").unwrap_or("?"), obj.get("SUMMARY").unwrap_or("?"));
print!(" {}", obj.get("LOCATION").unwrap_or("?"));
obj.get("URL").map(|url| print!(" <{}>", url));
println!("");
});
}
_ => break,
}
}
tx.commit()?;
Ok(())
}
}
#[derive(Debug)]
pub enum Error {
Db(DbError),
Http(reqwest::Error),
Io(std::io::Error),
}
impl From<DbError> for Error {
fn from(e: DbError) -> Self {
Error::Db(e)
}
}
impl From<reqwest::Error> for Error {
fn from(e: reqwest::Error) -> Self {
Error::Http(e)
}
}
impl From<std::io::Error> for Error {
fn from(e: std::io::Error) -> Self {
Error::Io(e)
}
}
fn main() {
let config_file = read_to_string("config.yaml")
.expect("config.yaml");
let config: Config = serde_yaml::from_str(&config_file)
.expect("config");
let res = Resources::new(
config.db_url,
config.calendars.into_iter()
.collect()
);
crossbeam::scope(|s| {
let cpus = num_cpus::get();
let workers: Vec<_> = (0..cpus)
.map(|_| s.spawn(|_| {
res.worker()
.map_err(|e| println!("{:?}", e))
}))
.collect();
for worker in workers.into_iter() {
worker.join().expect("worker").unwrap();
}
}).unwrap();
}