use nix_mirror::{handle_narinfo, store_path_to_narinfo_hash};
use std::collections::HashSet;
use std::path::PathBuf;
use futures::stream::{self, StreamExt};
use tokio::fs;
use anyhow::Result;
use indicatif::ProgressBar;
use structopt::StructOpt;
/// An application to synchronize nix binary caches
#[derive(StructOpt)]
struct Opt {
    /// The path to a store-paths.xz file containing the store paths of the packages
    /// that should be synchronized, e.g a copy of http://channels.nixos.org/nixpkgs-unstable/store-paths.xz
    store_paths: PathBuf,
    /// The directory where the mirror should be stored
    mirror_dir: PathBuf,
    /// URL to the cache server that should be used
    #[structopt(short, long, default_value="https://cache.nixos.org")]
    cache_url: String,
    /// Maximum number of concurrent downloads
    #[structopt(short, long, default_value = "8")]
    parallelism: usize,
}
#[tokio::main]
async fn main() -> Result<()> {
    let opt = Opt::from_args();
    let nar_dir = opt.mirror_dir.join("nar");
    fs::create_dir_all(&nar_dir).await?;
    // read all store paths to memory, there aren't that many of
    // them, so we might as well read all of them into memory
    let store_paths = {
        use std::{fs::File, io::Read};
        let mut s = String::new();
        File::open(&opt.store_paths)
            .map(xz2::read::XzDecoder::new)
            .and_then(|mut rdr| rdr.read_to_string(&mut s))?;
        s
    };
    // a bit hacky, since we don't know how many files we need to process until
    // we're done, but it might still be nice to see some progress.
    let progress = ProgressBar::new(0);
    let client = reqwest::Client::new();
    // our initial set of narinfo hashes to process
    let mut current_narinfo_hashes = store_paths
        .lines()
        .map(|x| store_path_to_narinfo_hash(x).map(String::from))
        .collect::<Result<HashSet<_>>>()?;
    // all narinfo hashes that we have seen
    let mut processed_narinfo_hashes = HashSet::new();
    while !current_narinfo_hashes.is_empty() {
        let mut futures = Vec::new();
        for narinfo_hash in current_narinfo_hashes.drain() {
            futures.push(handle_narinfo(
                &client,
                &opt.cache_url,
                &opt.mirror_dir,
                narinfo_hash.clone(),
            ));
            processed_narinfo_hashes.insert(narinfo_hash);
            progress.inc_length(1);
        }
        // handle at most `opt.parallelism` concurrent futures at the same time
        let mut stream = stream::iter(futures).buffer_unordered(opt.parallelism);
        // for the result of each future, check to see if we've already seen that hash
        // and if not add it to the set of hashes to process
        while let Some(result) = stream.next().await {
            let new_hashes = result?;
            current_narinfo_hashes.extend(
                new_hashes
                    .into_iter()
                    .filter(|x| !processed_narinfo_hashes.contains(x)),
            );
            progress.inc(1);
        }
    }
    Ok(())
}

use std::path::Path;
use futures::stream::StreamExt;
use tokio::fs;
use tokio::prelude::*;
use tokio::task;
use anyhow::{anyhow, bail, Context, Result};
use nix_base32::to_nix_base32;
use path_clean::PathClean;
use sha2::{Digest, Sha256};
/// Extracts the narinfo hash part from a nix store filename.
/// ```
/// use nix_mirror::filename_to_narinfo_hash;
/// let hash = filename_to_narinfo_hash("0001w2k3pgl0pkrn827dxiibvc2sibnd-singleton-bool-0.1.5.tar.gz.drv").unwrap();
/// assert_eq!(hash, "0001w2k3pgl0pkrn827dxiibvc2sibnd");
/// ```
pub fn filename_to_narinfo_hash(filename: &str) -> Result<&str> {
    filename
        .split('-')
        .next()
        .ok_or_else(|| anyhow!("failed to parse narinfo hash: {}", filename))
}
/// Extracts the narinfo hash path from a nix store path
/// ```
/// use nix_mirror::store_path_to_narinfo_hash;
/// let hash = store_path_to_narinfo_hash("/nix/store/0001w2k3pgl0pkrn827dxiibvc2sibnd-singleton-bool-0.1.5.tar.gz.drv").unwrap();
/// assert_eq!(hash, "0001w2k3pgl0pkrn827dxiibvc2sibnd");
/// ```
pub fn store_path_to_narinfo_hash(store_path: &str) -> Result<&str> {
    store_path
        .split('/')
        .nth(3)
        .ok_or_else(|| anyhow!("failed to parse store_path: {}", store_path))
        .and_then(filename_to_narinfo_hash)
}
/// Download a single file to a temporary file, moving it to the destination file atomically
/// if the download succeeded.
///
/// `client` - a reqwest::Client, as given by `reqwest::Client::new()`.
/// `url` - the url we want to download
/// `destination` - where we want the resulting file to end up
/// `hash` - optionally a sha256-digest (in nix-base32) of the file that will be checked
pub async fn download_atomically(
    client: &reqwest::Client,
    url: String,
    destination: &Path,
    hash: Option<&str>,
) -> Result<fs::File> {
    let mut resp_stream = client
        .get(&url)
        .send()
        .await?
        .error_for_status()?
        .bytes_stream();
    let mut ctx = hash.map(|_| Sha256::new());
    let destination_dir = destination.parent().unwrap();
    let result: Result<_> = task::block_in_place(|| {
        let tempfile = tempfile::NamedTempFile::new_in(&destination_dir)?;
        let f: fs::File = tempfile.reopen()?.into();
        Ok((tempfile, f))
    });
    let (tempfile, mut async_file) = result?;
    while let Some(bytes) = resp_stream.next().await {
        let bytes = bytes?;
        if let Some(ctx) = ctx.as_mut() {
            ctx.update(&bytes);
        }
        async_file.write_all(&bytes).await?;
    }
    async_file.shutdown().await?;
    if let Some(ctx) = ctx {
        let hash = hash.unwrap();
        let computed = to_nix_base32(&ctx.finalize().as_ref());
        if computed != hash {
            bail!(
                "hash of file: {:?} failed, expected: {}, got: {}",
                destination,
                hash,
                computed
            );
        }
    }
    let f = task::block_in_place(|| tempfile.persist(&destination))?;
    let mut f = fs::File::from(f);
    f.seek(std::io::SeekFrom::Start(0)).await?;
    Ok(f)
}
/// Download a narinfo file (or open it if it already exists), parse it and download
/// the referenced nar-archive (if it doesn't already exist).
///
/// Returns a `Vec` of narinfo hashes for all the packages references, so that they can
/// be downloaded in turn.
pub async fn handle_narinfo(
    client: &reqwest::Client,
    cache_url: &String,
    mirror_dir: &Path,
    narinfo_hash: String,
) -> Result<Vec<String>> {
    let mut narinfo_filename = mirror_dir.join(&narinfo_hash);
    narinfo_filename.set_extension("narinfo");
    let narinfo_filename = narinfo_filename.clean();
    // check to see if the narinfo file exists and download it if it doesn't
    // (or if we fail to open it).
    let narinfo_file = if let Ok(f) = fs::File::open(&narinfo_filename).await {
        f
    } else {
        let url = format!("{}/{}.narinfo", cache_url, &narinfo_hash);
        download_atomically(client, url, &narinfo_filename, None).await?
    };
    let narinfo_file = io::BufReader::new(narinfo_file);
    let mut lines = narinfo_file.lines();
    // ugly parser, but it would be overkill to reach for a parsing library here
    let mut url = Err(anyhow!("failed to find URL"));
    let mut references = Vec::new();
    let mut filehash = Err(anyhow!("failed to find filehash"));
    while let Some(line) = lines.next().await {
        let line = line?;
        let mut split = line.splitn(2, ": ");
        let key = split.next().context("failed to find key")?;
        let val = split.next().context("failed to find val")?;
        match key {
            "URL" => url = Ok(String::from(val)),
            "References" => {
                references = val
                    .split_whitespace()
                    .flat_map(|x| x.split("-").next())
                    .map(String::from)
                    .collect()
            }
            "FileHash" => {
                filehash = val
                    .split(':')
                    .nth(1)
                    .map(String::from)
                    .context("invalid filehash")
            }
            _ => {}
        }
    }
    // we error out if we didn't find an url or a filehash
    let url = url?;
    let filehash = filehash?;
    // check to see if we need to download the nar archive, if so do it
    let filename = mirror_dir.join(&url).clean();
    if fs::File::open(&filename).await.is_err() {
        let url = format!("{}/{}", cache_url, &url);
        download_atomically(client, url, &filename, Some(&filehash)).await?;
    }
    Ok(references.into_iter().map(String::from).collect())
}

{ pkgs ? import <nixpkgs> {}
, lib ? pkgs.lib
, rustPlatform ? pkgs.rustPlatform
, openssl ? pkgs.openssl
, pkgconfig ? pkgs.pkgconfig
}:
rustPlatform.buildRustPackage rec {
  pname = "nix-mirror";
  version = "0.1";
  nativeBuildInputs = [ pkgconfig ];
  buildInputs = [ openssl.dev ];
  src = lib.cleanSource ./.;
  cargoSha256 = "0dm9nmz8qblj2s67jy6gcsx9hqqkh42nk64yd8zppmky06p2x939";
}

{ pkgs ? import <nixpkgs> {}
, lib ? pkgs.lib
, rustPlatform ? pkgs.rustPlatform
, openssl ? pkgs.openssl
, pkgconfig ? pkgs.pkgconfig
}:
rustPlatform.buildRustPackage rec {
  pname = "nix-mirror";
  version = "0.1";
  nativeBuildInputs = [ pkgconfig ];
  buildInputs = [ openssl.dev ];
  src = lib.cleanSource ./.;
  cargoSha256 = "0dm9nmz8qblj2s67jy6gcsx9hqqkh42nk64yd8zppmky06p2x939";
}

# nix-mirror: a tool for mirroring nix binary caches
## Background
It is possible to mirror a nix binary cache using the `nix` command line tool using a command sucn as:
```
xzcat store-paths.xz | nix copy --from https://cache.nixos.org --to file:///path/to/where/the/mirror/should/end/up
```
where store-paths.xz is a file containing the store-paths of all binaries in
the cache, e.g. https://channels.nixos.org/nixos-unstable/store-paths.xz
However that command will use a lot of system resources since it will unpack
all of the downloaded files and repack them before writing them to disk (if I
have understood the reasons for the high cpu usage correctly).
## Features
- [x] Parallel downloads
- [x] Atomic downloads
- [x] Sha256 verification of downloaded archives.
## Building
### With cargo
Make sure to have openssl and pkg-config installed and run `cargo build`.
If using nix you can use the provided `shell.nix` which is only a symlink to
`default.nix` to get the dependencies.
### With nix
Run `nix-build` as usual.
## Usage
- `nix-mirror --help` to show application help
- `nix-mirror store-paths.xz ./mirror` to download all the archives in
`store-paths.xz` and their transitive dependencies to the directory `./mirror`.
## License
Licensed under either of
- [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
- [MIT license](http://opensource.org/licenses/MIT)
at your option.

Copyright (c) 2015 The sodiumoxide Developers
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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[package]
name = "nix-mirror"
version = "0.1.0"
authors = ["user <user@example.org>"]
edition = "2018"
license = "MIT OR Apache-2.0"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
futures = "0.3.6"
indicatif = "0.15.0"
structopt = "0.3.20"
anyhow = "1.0.33"
xz2 = "0.1.6"
path-clean = "0.1.0"
tempfile = "3.1.0"
nix-base32 = "0.1.1"
sha2 = "0.9.1"
[dependencies.tokio]
version = "0.2.22"
features = [ "fs", "macros", "rt-threaded" ]
[dependencies.reqwest]
version = "0.10.8"
features = [ "stream" ]

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