104 lines
3.5 KiB
Rust
104 lines
3.5 KiB
Rust
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use std::error::Error;
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use serde_derive::{Deserialize, Serialize};
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use super::{Problem, Problems, Query, Fetcher};
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const PROBLEMS_URL: &str = "https://leetcode.cn/api/problems/algorithms/";
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const GRAPHQL_URL: &str = "https://leetcode.cn/graphql";
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impl Fetcher {
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pub fn new() -> Fetcher {
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Fetcher {
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client: reqwest::Client::new()
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}
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}
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pub async fn get_problems(&self) -> Result<Problems, reqwest::Error> {
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Ok(reqwest::get(PROBLEMS_URL)
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.await?
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.json()
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.await?
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)
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}
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pub async fn get_problem(self, question_id: u32) -> Result<Problem, Box<dyn Error>> {
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let problems = self.get_problems().await?;
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for problem in &problems.stat_status_pairs {
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match problem.stat.frontend_question_id.parse::<u32>() {
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Ok(id) => {
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if id == question_id {
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if problem.paid_only {
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return Err("failed to get paid only problem".into())
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}
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let query = match &problem.stat.question_title_slug {
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None => {
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Err::<Query, Box<dyn Error>>("failed to get problem title slug".into())
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}
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Some(value) => {
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Ok(Query::new(value.as_str()))
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}
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}?;
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let response = self.client
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.post(GRAPHQL_URL)
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.json(&query)
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.send()
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.await?
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.json::<RawProblem>()
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.await?;
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let title = problem.stat.question_title.clone()
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.ok_or::<Box<dyn Error>>("failed to get problem title".into())?;
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let title_slug = problem.stat.question_title_slug.clone()
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.ok_or::<Box<dyn Error>>("failed to get problem title slug".into())?;
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let return_type = {
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let v = serde_json::from_str::<serde_json::Value>(
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&response.data.question.meta_data);
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v.and_then(|x| {
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return Ok(x.to_string().replace("\"", ""))
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})
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}?;
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let code_definition = serde_json::from_str(
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&response.data.question.code_definition
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)?;
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return Ok(Problem {
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title,
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title_slug,
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code_definition,
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content: response.data.question.content,
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question_id: id,
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return_type
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})
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}
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}
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Err(_) => {}
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}
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}
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Err("failed to get target problem".into())
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}
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct RawProblem {
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data: Data,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct Data {
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question: Question,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct Question {
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content: String,
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stats: String,
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#[serde(rename = "codeDefinition")]
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code_definition: String,
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#[serde(rename = "sampleTestCase")]
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sample_test_case: String,
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#[serde(rename = "metaData")]
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meta_data: String,
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}
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