commit 70dc70dbbb0e05d1d5e03b80b81d1e5794201a65
Author: Jonathan Strong <jonathan@keyrock.eu>
Date:   Sat Sep 3 01:51:11 2022 -0400

    initial commit

diff --git a/.gitignore b/.gitignore
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index 0000000..1d82798
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
+dependencies = [
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
+
+[[package]]
+name = "winreg"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ab674e8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "registry-backup"
+authors = ["Jonathan Strong <jstrong@shipyard.rs>"]
+version = "0.1.0"
+edition = "2021"
+publish = ["shipyard-rs-public"]
+
+[dependencies]
+clap = { version = "3.1", default-features = false, features = ["std", "derive", "cargo"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1.0.69"
+toml = "0.5.9"
+tempdir = "0.3.7"
+tracing = "0.1.29"
+tracing-subscriber = { version = "0.2.18", features = ["env-filter", "registry"] }
+tokio = { version = "1.21", features = ["full"] }
+reqwest = { version = "0.11", default-features = false, features = ["json", "stream", "rustls-tls", "cookies", "multipart", "gzip", "brotli", "deflate", "trust-dns"] }
+futures = "0.3.7"
+walkdir = "2.3"
+num_cpus = "1.3"
+governor = "0.4.2"
+pretty_toa = "1"
diff --git a/config.toml.sample b/config.toml.sample
new file mode 100644
index 0000000..c3d7fab
--- /dev/null
+++ b/config.toml.sample
@@ -0,0 +1,16 @@
+# index repo url
+index-url = "ssh://git@ssh.shipyard.rs/shipyard-rs-public/crate-index.git"
+
+# alternatively, specify a local dir
+# index-path = "/path/to/cloned/index"
+
+[http]
+user-agent = "registry-backup/v0.1.0"
+requests-per-second = 40
+max-concurrent-requests = 20
+
+[output]
+path = "output"
+format = "/{crate}/{version}/download"
+
+# auth-token = "xxx"
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..43ad0b6
--- /dev/null
+++ b/justfile
@@ -0,0 +1,25 @@
+set dotenv-load := true
+rustc-version := "nightly"
+publish-registry := "shipyard-rs-public"
+
+export RUSTFLAGS := "-C link-arg=-fuse-ld=lld -C target-cpu=native"
+
+cargo +args='':
+    cargo +{{rustc-version}} {{args}}
+
+check +args='':
+    @just cargo check {{args}}
+
+test +args='':
+    just cargo test {{args}}
+
+debug-build +args='':
+    @just cargo build --bin registry-backup {{args}}
+
+release-build +args='':
+    @just cargo build --bin registry-backup --release {{args}}
+
+
+
+
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..5067e4a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,537 @@
+use std::path::{Path, PathBuf};
+use std::time::*;
+use std::str::from_utf8;
+use std::process::Output;
+use std::num::NonZeroU32;
+
+use clap::Parser;
+use serde::Deserialize;
+use tracing::{debug, info, warn, error};
+use tracing_subscriber::filter::EnvFilter;
+use futures::stream::StreamExt;
+use tokio::io::AsyncBufReadExt;
+use governor::prelude::*;
+use governor::{Quota, RateLimiter};
+use reqwest::header::{CONTENT_TYPE, AUTHORIZATION, ACCEPT};
+
+type AnyError = Box<dyn std::error::Error>;
+
+/// type representing the schema of the config.json file
+/// placed at the root of the crate index repo.
+///
+/// e.g.
+///
+/// ```json,ignore
+/// {
+///   "dl": "https://crates.shipyard.rs/api/v1/crates",
+///   "api": "https://crates.shipyard.rs",
+///   "allowed-registries": ["https://github.com/rust-lang/crates.io-index"]
+/// }
+/// ```
+#[derive(Debug, Clone, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct RegistryConfig {
+    pub dl: String,
+    pub api: String,
+    #[serde(default)]
+    pub allowed_registries: Vec<String>,
+    #[serde(default)]
+    pub auth_required: Option<bool>,
+}
+
+/// One version per line in the index metadata files.
+#[derive(Debug, Clone, Deserialize)]
+pub struct CrateVersion {
+    pub name: String,
+    pub vers: String,
+}
+
+/// Configuration for where to save the downloaded .crate files, and
+/// using what syntax for the output filenames.
+#[derive(Deserialize, Debug, Parser)]
+#[serde(rename_all = "kebab-case")]
+pub struct OutputConfig {
+    /// Directory where downloaded .crate files will be saved to.
+    #[clap(short, long = "output-path", default_value = DEFAULT_OUTPUT_PATH)]
+    #[serde(default = "default_output_path")]
+    pub path: PathBuf,
+    // /// What format to use for the output filenames. Works the same as
+    // /// Cargo's registry syntax for the "dl" key in the `config.json`
+    // /// file in a reigstry index. See [Cargo
+    // /// docs](https://doc.rust-lang.org/cargo/reference/registries.html#index-format)
+    // /// for additional details. Not specifying this field is equivalent
+    // /// to specifying "/{crate}/{version}/download", the default.
+    // #[clap(long = "output-format")]
+    // pub format: Option<String>,
+    // /// Use whatever output filename syntax is specified in the target
+    // /// registry's `config.json` file. Conflicts with --output-format.
+    // #[serde(default)]
+    // #[clap(long)]
+    // pub mirror_registry_format: bool,
+}
+
+#[derive(Deserialize, Debug, Parser)]
+#[serde(rename_all = "kebab-case")]
+pub struct HttpConfig {
+    /// Value of user-agent HTTP header
+    #[serde(default = "default_user_agent")]
+    #[clap(short, long, default_value = DEFAULT_USER_AGENT)]
+    pub user_agent: String,
+    /// Requests to registry server will not exceed this rate
+    #[serde(default = "default_requests_per_second")]
+    #[clap(long, default_value_t = default_requests_per_second())]
+    pub requests_per_second: NonZeroU32,
+    /// Independent of the requests per second rate limit, no more
+    /// than `max_concurrent_requests` will be in flight at any given
+    /// moment.
+    #[serde(default = "default_max_concurrent_requests")]
+    #[clap(long, default_value_t = default_max_concurrent_requests())]
+    pub max_concurrent_requests: NonZeroU32,
+}
+
+/// Download all .crate files from a registry server.
+#[derive(Deserialize, Parser)]
+#[serde(rename_all = "kebab-case")]
+#[clap(
+    author,
+    version,
+    about,
+    global_setting(clap::AppSettings::DeriveDisplayOrder)
+)]
+pub struct Config {
+    /// URL of the registry index we are downloading .crate files from. The
+    /// program expects that it will be able to clone the index to a local
+    /// temporary directory; the user must handle authentication if needed.
+    #[serde(default)]
+    #[clap(long)]
+    pub index_url: Option<String>,
+    /// instead of an index url, just point to a local path where the index
+    /// is already cloned.
+    #[serde(default)]
+    #[clap(long, conflicts_with = "index_url")]
+    pub index_path: Option<PathBuf>,
+    /// Where to save the downloaded files
+    #[clap(flatten)]
+    pub output: OutputConfig,
+    /// Download settings
+    #[clap(flatten)]
+    pub http: HttpConfig,
+    /// If registry requires authorization (i.e. "auth-required" key is
+    /// set to `true` in the `config.json` file), the token to include
+    /// using the Authorization HTTP header.
+    #[clap(short, long, alias = "token")]
+    #[serde(default)]
+    pub auth_token: Option<String>,
+    /// Specify configuration values using the provided TOML file, instead of
+    /// via command line flags. The values in the config file will override
+    /// any values passed as command line flags. See config.toml.sample for
+    /// syntax of the config file.
+    #[serde(default)]
+    #[clap(short, long, exclusive(true))]
+    pub config_file: Option<PathBuf>,
+
+    // TODO: offer some way to specify you want to use an existing
+    // path as the index, instead of cloning it
+}
+
+const DEFAULT_OUTPUT_PATH: &str = "output";
+const DEFAULT_USER_AGENT: &str = concat!("registry-backup/v", clap::crate_version!());
+
+// const DEFAULT_INDEX: &str = "https://github.com/rust-lang/crates.io-index.git";
+// fn default_index() -> String {
+//     DEFAULT_INDEX.to_string()
+// }
+
+fn default_output_path() -> PathBuf {
+    PathBuf::from(DEFAULT_OUTPUT_PATH)
+}
+
+fn default_user_agent() -> String {
+    DEFAULT_USER_AGENT.to_string()
+}
+
+const fn default_requests_per_second() -> NonZeroU32 {
+    unsafe { NonZeroU32::new_unchecked(25) }
+}
+
+const fn default_max_concurrent_requests() -> NonZeroU32 {
+    unsafe { NonZeroU32::new_unchecked(10) }
+}
+
+impl std::fmt::Debug for Config {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        f.debug_struct("Config")
+            .field("index_url", &self.index_url)
+            .field("index_path", &self.index_path)
+            .field("output", &self.output)
+            .field("http", &self.http)
+            .field("auth_token", &"***") // hide sensitive data
+            .field("config_file", &self.config_file)
+            .finish()
+    }
+}
+
+async fn popen(
+    cmd: &str,
+    args: &[&str],
+    envs: &[(&str, &str)],
+) -> Result<Output, AnyError> {
+    let args: Vec<String> = args.iter()
+        .map(|x| x.to_string())
+        .collect();
+
+    let output = tokio::process::Command::new(cmd)
+        .args(args.iter().map(|x| x.as_str()))
+        .envs(envs.iter().map(|(k,v)| (k.to_string(), v.to_string())))
+        .output()
+        .await
+        .map_err(|e| {
+            error!("Command `{}` failed to execute at all: {:?}", cmd, e);
+            e
+        })?;
+
+    debug!("finished executing `{}` Command with status {:?}\n\
+            STDOUT (length={}):\n{}\n\
+            STDERR (length={}):\n{}\n",
+        cmd,
+        output.status,
+        output.stdout.len(),
+        from_utf8(&output.stdout)?,
+        output.stderr.len(),
+        from_utf8(&output.stderr)?,
+    );
+
+    if ! output.status.success() {
+        error!("finished executing `{}` Command with status {:?}\n\
+                STDOUT (length={}):\n{}\n\
+                STDERR (length={}):\n{}\n",
+            cmd,
+            output.status,
+            output.stdout.len(),
+            from_utf8(&output.stdout)?,
+            output.stderr.len(),
+            from_utf8(&output.stderr)?,
+        );
+
+        return Err(format!("git clone commnad failed with error code {:?}", output.status).into())
+    }
+
+    Ok(output)
+}
+
+async fn git_clone(
+    src: &str,
+    dst: &Path,
+    envs: &[(&str, &str)],
+) -> Result<(), AnyError> {
+    let begin = Instant::now();
+    popen(
+        "git",
+        &[
+            "clone",
+            src,
+            dst.to_str().expect("dst path .to_str() failed"),
+        ][..],
+        envs,
+    )
+        .await
+        .map_err(|e| -> AnyError {
+            error!(%src, ?dst, ?e, "in git_clone, Command failed");
+            e
+        })?;
+
+    info!(%src, ?dst, "cloned repo in {:?}", begin.elapsed());
+
+    Ok(())
+}
+
+fn setup_logger() {
+    let env_filter = EnvFilter::from_default_env();
+    let builder = tracing_subscriber::fmt()
+        .with_env_filter(env_filter)
+        .with_ansi(true);
+    builder.init();
+}
+
+async fn load_config_file(config: Config) -> Result<Config, AnyError> {
+    match config.config_file.as_ref() {
+        Some(path) => {
+            debug!(?path, "loading config file");
+            let toml = tokio::fs::read_to_string(&path).await?;
+            let config: Config = toml::from_str(&toml)?;
+            Ok(config)
+        }
+
+        None => Ok(config),
+    }
+}
+
+async fn load_registry_config(clone_dir: &Path) -> Result<RegistryConfig, AnyError> {
+    let json = tokio::fs::read_to_string(clone_dir.join("config.json")).await?;
+    let parsed = serde_json::from_str(&json)?;
+    Ok(parsed)
+}
+
+fn is_hidden(entry: &walkdir::DirEntry) -> bool {
+    entry.file_name()
+         .to_str()
+         .map(|s| s.starts_with('.'))
+         .unwrap_or(false)
+}
+
+async fn get_crate_versions(clone_dir: &Path) -> Result<Vec<CrateVersion>, AnyError> {
+    let files: Vec<PathBuf> = walkdir::WalkDir::new(clone_dir)
+        .max_depth(3)
+        .into_iter()
+        .filter_entry(|e| !is_hidden(e))
+        .filter_map(|res| {
+            match res {
+                Ok(entry) => {
+                    if entry.file_type().is_file() && entry.depth() >= 2 && entry.depth() <= 3 {
+                        let path = entry.into_path();
+                        debug!(?path, "found crate metadata file to parse");
+                        Some(path)
+                    } else {
+                        None
+                    }
+                }
+                Err(e) => {
+                    warn!(error = ?e, "walkdir result is error");
+                    None
+                }
+            }
+        }).collect();
+
+    info!("found {} crate metadata files to parse", files.len());
+
+    let crate_versions: Vec<Result<Vec<CrateVersion>, AnyError>> = futures::stream::iter(
+        files.into_iter().map(|path| {
+            async move {
+                let file = tokio::fs::File::open(&path)
+                    .await
+                    .map_err(|e| { error!(err = ?e, ?path, "failed to open file"); e })?;
+                let buf = tokio::io::BufReader::new(file);
+                let mut out = Vec::new();
+                let mut lines = buf.lines();
+                while let Some(line) = lines.next_line().await? {
+                    let vers: CrateVersion = serde_json::from_str(&line)
+                        .map_err(|e| { error!(err = ?e, ?path, "failed to parse line"); e })?;
+                    out.push(vers);
+                }
+                debug!(crate_name = %out.first().map(|x| x.name.as_str()).unwrap_or("na"),
+                    "parsed {} crate versions from metadata file", out.len()
+                );
+
+                Ok(out)
+            }
+        })
+    )
+        .buffer_unordered(num_cpus::get())
+        .collect()
+        .await;
+
+    let crate_versions: Vec<CrateVersion> = crate_versions.into_iter()
+        .flat_map(|result| {
+            match result {
+                Ok(xs) => xs.into_iter().filter(|x| x.name != "vst").collect(),
+                Err(e) => {
+                    error!(err = ?e, "parsing metadata failed, skipping file");
+                    vec![]
+                }
+            }
+        }).collect();
+
+    info!("collected {} total crate versions to download", crate_versions.len());
+    
+    Ok(crate_versions)
+}
+
+async fn ensure_dir_exists<P: AsRef<std::path::Path>>(path: P) -> Result<(), AnyError> {
+    match tokio::fs::metadata(path.as_ref()).await {
+        Ok(meta) if meta.is_dir() => Ok(()),
+
+        Ok(meta) /* if ! meta.is_dir() */ => {
+            debug_assert!( ! meta.is_dir());
+            Err(format!("path exists, but is not a directory: {:?}", path.as_ref()).into())
+        }
+
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
+            tokio::fs::create_dir_all(&path).await?;
+            Ok(())
+        }
+
+        Err(e) => Err(e.into()),
+    }
+}
+
+async fn ensure_file_parent_dir_exists<P: AsRef<std::path::Path>>(path: P) -> Result<(), AnyError> {
+    if let Some(parent_dir) = path.as_ref().parent() {
+        ensure_dir_exists(parent_dir).await
+    } else {
+        Ok(())
+    }
+}
+
+macro_rules! megabytes {
+    ($x:expr) => {{
+        use pretty_toa::ThousandsSep;
+        let mb = $x as f64 / 1024.0 /1024.0;
+        if mb > 2048.0 {
+            format!("{}G", (((mb / 1024.0) * 100.0).round() / 100.0).thousands_sep())
+        } else if mb < 0.75 {
+            let kb = $x as f64 / 1024.0;
+            format!("{}K", ((kb * 10.0).round() / 10.0).thousands_sep())
+        } else {
+            format!("{}M", ((mb * 10.0).round() / 10.0).thousands_sep())
+        }
+    }}
+}
+
+async fn download_versions(config: &Config, registry_config: &RegistryConfig, versions: Vec<CrateVersion>) -> Result<(), AnyError> {
+    let begin = Instant::now();
+    ensure_dir_exists(&config.output.path).await?;
+
+    let rate_limit = RateLimiter::direct(
+        Quota::per_second(config.http.requests_per_second)
+    );
+
+    let http_client = reqwest::Client::builder()
+        .user_agent(&config.http.user_agent)
+        .build()?;
+
+    let inner_stream = futures::stream::iter(
+        versions.into_iter().map(|vers| {
+            let req_begin = Instant::now();
+            let http_client = http_client.clone();
+            async move {
+                // TODO actually parse and use the format
+                let vers_path = format!("{}/{}/download", vers.name, vers.vers);
+                let url = format!("{}/{}", registry_config.dl, vers_path);
+                debug!(?url, "downloading...");
+                let req = http_client.get(url)
+                    .header(CONTENT_TYPE, "application/json")
+                    .header(ACCEPT, "application/json");
+
+                let req = if let Some(token) = config.auth_token.as_deref() {
+                    req.header(AUTHORIZATION, token)
+
+                } else {
+                    req
+                };
+
+                let resp = req.send().await?;
+                let status = resp.status();
+                let body = resp.bytes().await?;
+                if ! status.is_success() {
+                    error!(status = ?status, "download failed");
+                    debug!("response body:\n{}\n", from_utf8(&body.slice(..))?);
+                    Err::<_, AnyError>(format!("error response {:?} from server", status).into())
+                } else {
+                    // TODO: check if this path exists already before downloading
+                    let output_path = config.output.path.join(vers_path);
+                    ensure_file_parent_dir_exists(&output_path)
+                        .await
+                        .map_err(|e| {
+                            error!(?output_path, err = ?e, "ensure parent dir exists failed");
+                            e
+                        })?;
+                    tokio::fs::write(&output_path, body.slice(..))
+                        .await
+                        .map_err(|e| { error!(err = ?e, "writing file failed"); e })?;
+                    info!(
+                        filesize = megabytes!(body.len()),
+                        crate_name = %vers.name,
+                        version = %vers.vers,
+                        "downloaded .crate file in {:?}", req_begin.elapsed());
+                    debug!(?output_path, "wrote {} bytes to file", body.len());
+                    Ok(output_path)
+                }
+            }
+        })
+    )
+        .buffer_unordered(config.http.max_concurrent_requests.get() as usize);
+
+    let outer_stream = inner_stream.ratelimit_stream(&rate_limit);
+
+    let results: Vec<Result<PathBuf, AnyError>> =
+        outer_stream
+            .collect()
+            .await;
+
+    let mut ret = Ok(());
+
+    let n = results.len();
+    let mut n_err = 0;
+    for result in results {
+        if let Err(e) = result {
+            n_err += 1;
+            error!(err = ?e, "download failed");
+            ret = Err(e);
+        }
+    }
+
+    let n_ok = n - n_err;
+    info!(n_ok, n_err, "finished downloading {} files in {:?}", n_ok, begin.elapsed());
+
+    ret
+}
+
+async fn run(config: Config) -> Result<(), AnyError> {
+    let config = load_config_file(config).await?;
+    debug!("config:\n{:#?}\n", config);
+
+    assert!(config.index_url.is_some() || config.index_path.is_some(),
+        "one of index-url or index-path is required",
+    );
+
+    let tmpdir = tempdir::TempDir::new("registry-backup-index")?;
+
+    let index_path = match (&config.index_url, &config.index_path) {
+        (Some(url), _) => {
+            let tmp = tmpdir.path();
+            git_clone(url, tmp, &[][..]).await?;
+            tmp
+        }
+
+        (_, Some(path)) => path,
+
+        _ => unreachable!(),
+    };
+
+    let registry_config = load_registry_config(index_path).await?;
+
+    let versions = get_crate_versions(index_path).await?;
+
+    download_versions(&config, &registry_config, versions).await?;
+    Ok(())
+}
+
+fn main() {
+    let begin = Instant::now();
+
+    setup_logger();
+
+    info!("initializing...");
+
+    let config = Config::parse();
+
+    let rt = tokio::runtime::Builder::new_multi_thread()
+        .enable_all()
+        .build()
+        .unwrap();
+
+    rt.block_on(run(config)).unwrap();
+
+    info!("finished in {:?}", begin.elapsed());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_sample_config() {
+        const TOML: &str = include_str!("../config.toml.sample");
+        let _config: Config = toml::from_str(TOML).unwrap();
+    }
+}