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use std::borrow::Cow;
use std::{fmt, error};
use reqwest::{self, Url, UrlError, Error as HttpError};
use serde_json;
use super::*;
#[derive(Clone, Debug, Default)]
pub struct Query<'a> {
name: Cow<'a, str>,
no_html: bool,
query: Cow<'a, str>,
skip_disambig: bool,
}
impl<'a> Query<'a> {
pub fn new<I: Into<Cow<'a, str>>>(query: I, name: I) -> Self {
Query { query: query.into(), name: name.into(), ..Self::default() }
}
pub fn no_html(mut self) -> Self {
self.no_html = true;
self
}
pub fn skip_disambig(mut self) -> Self {
self.skip_disambig = true;
self
}
pub fn execute(self) -> Result<Response, Error> {
Ok(reqwest::get(self.into_url()?)?.error_for_status()?.json()?)
}
fn into_url(self) -> Result<Url, UrlError> {
const URL: &'static str = "https://api.duckduckgo.com?format=json&no_redirect=1";
let mut query = String::from(URL);
if self.no_html {
query.push_str("&no_html=1");
}
if self.skip_disambig {
query.push_str("&skip_disambig=1");
}
Url::parse_with_params(&query, &[
("q", &*self.query),
("t", &*self.name)
])
}
}
#[derive(Debug)]
pub enum Error {
Http(HttpError),
Serde(serde_json::Error),
Url(UrlError),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use std::error::Error;
use self::Error::*;
match *self {
Http(ref err) => write!(f, "Http: {}", err.description()),
Serde(ref err) => write!(f, "Serde: {}", err.description()),
Url(ref err) => write!(f, "Url: {}", err.description()),
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
use self::Error::*;
match *self {
Http(ref err) => err.description(),
Serde(ref err) => err.description(),
Url(ref err) => err.description(),
}
}
}
impl From<HttpError> for Error {
fn from(error: HttpError) -> Self {
Error::Http(error)
}
}
impl From<UrlError> for Error {
fn from(error: UrlError) -> Self {
Error::Url(error)
}
}
impl From<serde_json::Error> for Error {
fn from(error: serde_json::Error) -> Self {
Error::Serde(error)
}
}
#[cfg(test)]
mod tests {
use super::Query;
const APP_NAME: &'static str = "ddg_rs_tests";
#[test]
fn it_works() {
let rs = Query::new("Rust", APP_NAME).execute();
println!("{:?}", rs);
assert!(rs.is_ok());
}
#[test]
fn never_directly_redirect() {
let query = Query::new("!crates tokei", APP_NAME);
let rs = query.execute();
assert!(rs.is_ok());
}
}