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|
use failure;
use reqwest;
use error::Result;
mod api_types;
const API_ROOT: &'static str = "https://ws.audioscrobbler.com/2.0/";
pub struct LastFMClient {
client: reqwest::Client,
api_key: String,
user: String,
}
pub struct Track {
pub artist: String,
pub album: String,
pub name: String,
pub timestamp: i64,
}
pub struct Tracks<'a> {
client: &'a LastFMClient,
page: u64,
buf: Vec<Track>,
from: Option<i64>,
}
impl<'a> Tracks<'a> {
fn new(client: &LastFMClient, from: Option<i64>) -> Tracks {
Tracks {
client,
page: 0,
buf: vec![],
from,
}
}
fn get_next_page(&mut self) -> Result<()> {
self.page += 1;
let req = self.client.client
.get(API_ROOT)
.query(&[
("method", "user.getrecenttracks"),
("api_key", &self.client.api_key),
("user", &self.client.user),
("format", "json"),
("page", &format!("{}", self.page)),
("limit", "200"),
]);
let req = if let Some(from) = self.from {
req.query(&[("from", &format!("{}", from))])
}
else {
req
};
let mut res = req.send()?;
if res.status().is_success() {
let data: api_types::recent_tracks = res.json()?;
self.buf = data.recenttracks.track
.iter()
.map(|t| {
Ok(Track {
artist: t.artist.text.clone(),
album: t.album.text.clone(),
name: t.name.clone(),
timestamp: t.date.uts.parse()?,
})
})
.collect::<Result<Vec<Track>>>()?;
Ok(())
}
else {
Err(failure::err_msg(res.status().as_str().to_string()))
}
}
}
impl<'a> Iterator for Tracks<'a> {
type Item = Track;
fn next(&mut self) -> Option<Track> {
if self.buf.len() == 0 {
let result = self.get_next_page();
if result.is_err() {
return None;
}
}
self.buf.pop()
}
}
impl LastFMClient {
pub fn new(api_key: &str, user: &str) -> LastFMClient {
LastFMClient {
client: reqwest::Client::new(),
api_key: api_key.to_string(),
user: user.to_string(),
}
}
pub fn track_count(&self, from: Option<i64>) -> Result<u64> {
let req = self.client
.get(API_ROOT)
.query(&[
("method", "user.getrecenttracks"),
("api_key", &self.api_key),
("user", &self.user),
("format", "json"),
]);
let req = if let Some(from) = from {
req.query(&[("from", &format!("{}", from))])
}
else {
req
};
let mut res = req.send()?;
if res.status().is_success() {
let data: api_types::recent_tracks = res.json()?;
Ok(data.recenttracks.attr.total.parse()?)
}
else {
Err(failure::err_msg(res.status().as_str().to_string()))
}
}
pub fn tracks(&self, from: Option<i64>) -> Tracks {
Tracks::new(&self, from)
}
}
|
