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#![warn(missing_docs)]
use std::{cmp, fmt, io, str};
use tetsy_fetch::{Client as FetchClient, Fetch};
use futures::{Future, Stream};
use log::warn;
use tetsy_runtime::Executor;
use serde_json::Value;
pub use tetsy_fetch;
#[derive(Debug)]
pub struct PriceInfo {
pub vapusd: f32,
}
pub struct Client<F = FetchClient> {
pool: Executor,
api_endpoint: String,
fetch: F,
}
impl<F> fmt::Debug for Client<F> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_struct("price_info::Client")
.field("api_endpoint", &self.api_endpoint)
.finish()
}
}
impl<F> cmp::PartialEq for Client<F> {
fn eq(&self, other: &Client<F>) -> bool {
self.api_endpoint == other.api_endpoint
}
}
impl<F: Fetch> Client<F> {
pub fn new(fetch: F, pool: Executor, api_endpoint: String) -> Client<F> {
Client { pool, api_endpoint, fetch }
}
pub fn get<G: FnOnce(PriceInfo) + Sync + Send + 'static>(&self, set_price: G) {
let future = self.fetch.get(&self.api_endpoint, tetsy_fetch::Abort::default())
.and_then(|response| response.concat2())
.and_then(move |body| {
let body_str = str::from_utf8(&body).ok();
let value: Option<Value> = body_str.and_then(|s| serde_json::from_str(s).ok());
let vapusd = value
.as_ref()
.and_then(|value| value.pointer("/result/vapusd"))
.and_then(|obj| obj.as_str())
.and_then(|s| s.parse().ok());
match vapusd {
Some(vapusd) => {
set_price(PriceInfo { vapusd });
Ok(())
},
None => {
let msg = format!("Unexpected response: {}", body_str.unwrap_or_default());
let err = io::Error::new(io::ErrorKind::Other, msg);
Err(tetsy_fetch::Error::Io(err))
}
}
})
.map_err(|err| {
warn!("Failed to auto-update latest VAP price: {:?}", err);
});
self.pool.spawn(future)
}
}
#[cfg(test)]
mod test {
use std::sync::{
Arc, atomic::{AtomicBool, Ordering}
};
use fake_fetch::FakeFetch;
use tetsy_runtime::{Runtime, Executor};
use super::Client;
fn price_info_ok(response: &str, executor: Executor) -> Client<FakeFetch<String>> {
Client::new(FakeFetch::new(Some(response.to_owned())), executor, "fake_endpoint".to_owned())
}
fn price_info_not_found(executor: Executor) -> Client<FakeFetch<String>> {
Client::new(FakeFetch::new(None::<String>), executor, "fake_endpoint".to_owned())
}
#[test]
fn should_get_price_info() {
let runtime = Runtime::with_thread_count(1);
let response = r#"{
"status": "1",
"message": "OK",
"result": {
"vapbtc": "0.0891",
"vapbtc_timestamp": "1499894236",
"vapusd": "209.55",
"vapusd_timestamp": "1499894229"
}
}"#;
let price_info = price_info_ok(response, runtime.executor());
price_info.get(|price| {
assert_eq!(price.vapusd, 209.55);
});
}
#[test]
fn should_not_call_set_price_if_response_is_malformed() {
let runtime = Runtime::with_thread_count(1);
let response = "{}";
let price_info = price_info_ok(response, runtime.executor());
let b = Arc::new(AtomicBool::new(false));
let bb = b.clone();
price_info.get(move |_| {
bb.store(true, Ordering::Relaxed);
});
assert_eq!(b.load(Ordering::Relaxed), false);
}
#[test]
fn should_not_call_set_price_if_response_is_invalid() {
let runtime = Runtime::with_thread_count(1);
let price_info = price_info_not_found(runtime.executor());
let b = Arc::new(AtomicBool::new(false));
let bb = b.clone();
price_info.get(move |_| {
bb.store(true, Ordering::Relaxed);
});
assert_eq!(b.load(Ordering::Relaxed), false);
}
}