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|
use util;
use failure::Fail;
use std::io::{Read, Write};
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: Option<u64>,
buf: Vec<Track>,
from: Option<i64>,
}
impl<'a> Tracks<'a> {
fn new(client: &LastFMClient, from: Option<i64>) -> Tracks {
Tracks {
client,
page: None,
buf: vec![],
from,
}
}
fn get_next_page(&mut self) -> failure::Fallible<()> {
if !self.page.is_some() {
self.page = Some(self.client.get_total_pages(self.from)?);
}
let page = self.page.unwrap();
if page < 1 {
return Ok(());
}
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!("{}", 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()
.filter(|t| t.date.is_some())
.map(|t| {
Ok(Track {
artist: t.artist.text.clone(),
album: t.album.text.clone(),
name: t.name.clone(),
timestamp: t.date.as_ref().unwrap().uts.parse()?,
})
})
.collect::<failure::Fallible<Vec<Track>>>()?;
self.page = Some(page - 1);
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(user: &str) -> failure::Fallible<LastFMClient> {
Ok(LastFMClient {
client: reqwest::Client::new(),
api_key: find_api_key()?,
user: user.to_string(),
})
}
pub fn track_count(&self, from: Option<i64>) -> failure::Fallible<u64> {
let data = self.recent_tracks(from)?;
Ok(data.recenttracks.attr.total.parse()?)
}
pub fn tracks(&self, from: Option<i64>) -> Tracks {
Tracks::new(&self, from)
}
fn get_total_pages(&self, from: Option<i64>) -> failure::Fallible<u64> {
let data = self.recent_tracks(from)?;
Ok(data.recenttracks.attr.totalPages.parse()?)
}
fn recent_tracks(
&self,
from: Option<i64>,
) -> failure::Fallible<api_types::recent_tracks> {
let req = self.client.get(API_ROOT).query(&[
("method", "user.getrecenttracks"),
("api_key", &self.api_key),
("user", &self.user),
("format", "json"),
("limit", "200"),
]);
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)
} else {
Err(failure::err_msg(res.status().as_str().to_string()))
}
}
}
fn find_api_key() -> failure::Fallible<String> {
let api_key_path = util::api_key_path()
.map_err(|e| e.context("failed to determine api key path"))?;
let api_key = if api_key_path.exists() {
let mut api_key = String::new();
let mut f = std::fs::File::open(&api_key_path).map_err(|e| {
e.context(format!("failed to open {}", api_key_path.display()))
})?;
f.read_to_string(&mut api_key).map_err(|e| {
e.context(format!(
"failed to read from {}",
api_key_path.display()
))
})?;
api_key
} else {
let api_key = rpassword::prompt_password_stderr(&format!(
"last.fm api key (will be stored in {}): ",
api_key_path.display()
))?;
std::fs::create_dir_all(api_key_path.parent().unwrap())?;
let mut f = std::fs::File::create(&api_key_path).map_err(|e| {
e.context(format!("failed to open {}", api_key_path.display()))
})?;
f.write_all(api_key.as_bytes()).map_err(|e| {
e.context(format!(
"failed to write to {}",
api_key_path.display()
))
})?;
api_key
};
Ok(api_key.trim_end().to_string())
}
|
