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use std::io::{Stdin, Read};
use std::cell::RefCell;
use std::ops::Deref;
use std::ops::DerefMut;
use failure::Fallible as Result;
use failure::Error;
use crate::v1::types::Problem;
use crate::v1::types::Package;
/// The high-level functionality of the repology API is represented in this trait
///
/// Each "functionality" is represented via one function.
///
/// # Note
///
/// This is implemented as a _trait_ rather than a _struct_ because this way we can reuse the
/// functionality for operating on a stream, for example on stdin as a source of data.
pub trait Api {
fn project<N: AsRef<str>>(&self, name: N) -> Result<Vec<Package>>;
fn problems_for_repo<R: AsRef<str>>(&self, repo: R) -> Result<Vec<Problem>>;
fn problems_for_maintainer<M: AsRef<str>>(&self, maintainer: M) -> Result<Vec<Problem>>;
}
/// Wrapper for "stdin"
///
/// This way we can implement the `Api` trait for StdIn (via a Wrapper for interior mutability)
/// This way we can read the data from stdin and process it.
pub struct StdinWrapper(RefCell<Stdin>);
impl From<Stdin> for StdinWrapper {
fn from(inner: Stdin) -> Self {
StdinWrapper(RefCell::new(inner))
}
}
impl Deref for StdinWrapper {
type Target = RefCell<Stdin>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for StdinWrapper {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl Api for StdinWrapper {
fn project<N: AsRef<str>>(&self, _name: N) -> Result<Vec<Package>> {
let s = read_to_string(self.0.try_borrow_mut()?.deref_mut())?;
serde_json::de::from_str(&s).map_err(Error::from)
}
fn problems_for_repo<R: AsRef<str>>(&self, _repo: R) -> Result<Vec<Problem>> {
let s = read_to_string(self.0.try_borrow_mut()?.deref_mut())?;
serde_json::de::from_str(&s).map_err(Error::from)
}
fn problems_for_maintainer<M: AsRef<str>>(&self, _maintainer: M) -> Result<Vec<Problem>> {
let s = read_to_string(self.0.try_borrow_mut()?.deref_mut())?;
serde_json::de::from_str(&s).map_err(Error::from)
}
}
fn read_to_string(input: &mut Read) -> Result<String> {
let mut buffer = String::new();
let read = input.read_to_string(&mut buffer)?;
trace!("Read {} bytes from stdin", read);
Ok(buffer)
}
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