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#[macro_use] extern crate serde_derive; #[macro_use] extern crate failure_derive; extern crate chrono; extern crate failure; extern crate fnv; extern crate reqwest; extern crate semver; extern crate serde; extern crate serde_json; extern crate url; use chrono::Utc; use failure::Error; use fnv::FnvHashMap as Map; use semver::{Version, VersionReq}; use serde::de::{Deserialize, DeserializeOwned, Deserializer}; use serde_json::Value; use url::Url; use std::env; use std::fmt::{self, Display}; use std::fs::{self, File}; use std::io::{Read, Write}; use std::path::{Path, PathBuf}; const PER_PAGE: usize = 100; const RETRIES: usize = 32; pub type DateTime = chrono::DateTime<Utc>; #[derive(Deserialize, Debug)] pub struct IndexPage { pub crates: Vec<IndexCrate>, pub meta: Meta, } #[derive(Deserialize, Debug)] pub struct IndexCrate { pub name: String, } #[derive(Deserialize, Debug)] pub struct Meta { pub total: usize, } #[derive(Deserialize, Debug)] pub struct Crate { #[serde(rename = "crate")] pub index: IndexCrate, pub versions: Vec<CrateVersion>, } #[derive(Deserialize, Debug)] pub struct Dependencies { pub dependencies: Vec<Dependency>, } #[derive(Deserialize, Clone, Debug)] pub struct Dependency { #[serde(rename = "crate_id")] pub name: String, pub kind: DependencyKind, pub req: VersionReq, pub optional: bool, pub default_features: bool, pub features: Vec<String>, } #[derive(Deserialize, PartialEq, Clone, Copy, Debug)] #[serde(rename_all = "lowercase")] pub enum DependencyKind { Normal, Build, Dev, } #[derive(Deserialize, Debug)] pub struct CrateVersion { pub num: Version, pub created_at: DateTime, pub features: Map<String, Vec<Feature>>, } #[derive(Clone, Debug)] pub enum Feature { Current(String), Dependency(String, String), } impl<'de> Deserialize<'de> for Feature { fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de>, { let mut s = String::deserialize(deserializer)?; Ok(match s.find('/') { Some(slash) => { let feature = s[slash + 1..].to_owned(); s.truncate(slash); Feature::Dependency(s, feature) } None => Feature::Current(s), }) } } pub fn cache_index(n: usize) -> Result<IndexPage, Error> { let endpoint = format!("/api/v1/crates?page={}", n); let location = format!("index/{}.json", n); cache(endpoint, location) } pub fn cache_crate(name: &str) -> Result<Crate, Error> { let endpoint = format!("/api/v1/crates/{}", name); let location = format!("crate/{}.json", name); cache(endpoint, location) } pub fn cache_dependencies(name: &str, num: &Version) -> Result<Dependencies, Error> { let endpoint = format!("/api/v1/crates/{}/{}/dependencies", name, num); let location = format!("dependencies/{}/{}.json", name, num); cache(endpoint, location) } pub fn num_pages() -> Result<usize, Error> { let total = cache_index(1)?.meta.total; Ok((total + PER_PAGE - 1) / PER_PAGE) } pub fn total_crates() -> Result<usize, Error> { Ok(cache_index(1)?.meta.total) } #[derive(Debug, Fail)] #[fail(display = "download did not return success: {}", url)] struct DownloadError { url: Url, } #[derive(Debug, Fail)] struct FileNotFoundError { path: PathBuf, } impl Display for FileNotFoundError { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { write!( formatter, "file not found, run `cargo tally --init` to download: {}", self.path.display() ) } } impl Display for DependencyKind { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match *self { DependencyKind::Normal => write!(formatter, "normal"), DependencyKind::Build => write!(formatter, "build"), DependencyKind::Dev => write!(formatter, "dev"), } } } impl Display for Feature { fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { match *self { Feature::Current(ref feature) => write!(formatter, "{}", feature), Feature::Dependency(ref name, ref feature) => write!(formatter, "{}/{}", name, feature), } } } fn cache<U, P, T>(endpoint: U, location: P) -> Result<T, Error> where U: AsRef<str>, P: AsRef<Path>, T: DeserializeOwned, { let location = location.as_ref(); assert!(location.is_relative()); let mut path = PathBuf::from("tally"); path.push(location); if path.exists() { let mut file = File::open(&path)?; let mut contents = String::new(); file.read_to_string(&mut contents)?; if let Ok(de) = serde_json::from_str(&contents) { return Ok(de); } } if env::var("ALLOW_DOWNLOAD").is_err() { return Err(Error::from(FileNotFoundError { path })); } let parent = path.parent().unwrap(); fs::create_dir_all(parent)?; let data: Value = download(endpoint.as_ref())?; let de = T::deserialize(&data)?; let j = serde_json::to_string_pretty(&data)?; let mut file = File::create(&path)?; file.write_all(j.as_bytes())?; Ok(de) } fn download<T>(endpoint: &str) -> Result<T, Error> where T: DeserializeOwned, { let mut url = Url::parse("https://crates.io").unwrap().join(endpoint)?; url.query_pairs_mut() .append_pair("per_page", &PER_PAGE.to_string()); let mut resp = retry(|| { let resp = reqwest::get(url.clone())?; if !resp.status().is_success() { return Err(Error::from(DownloadError { url: url.clone() })); } Ok(resp) })?; let data = resp.json()?; Ok(data) } #[cfg(feature = "cargo-clippy")] fn retry<F, R>(_f: F) -> R where F: Fn() -> R, { let _ = RETRIES; unimplemented!() } #[cfg(not(feature = "cargo-clippy"))] fn retry<F, T, E>(f: F) -> Result<T, E> where F: Fn() -> Result<T, E>, { #[allow(dead_code)] enum StaticAssert { False = false as isize, True = (RETRIES > 0) as isize, } for i in 1usize.. { let result = f(); if result.is_ok() || i == RETRIES { return result; } } unreachable!() }