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use std::collections::HashMap;use std::fs;
use anyhow::Context;use anyhow::Result;use flate2::write::GzEncoder;use flate2::Compression;use once_cell::sync::Lazy;use parking_lot::Mutex;use tar::Builder;
use crate::testdata_path;
pub static CUSTOM_NPM_PACKAGE_CACHE: Lazy<CustomNpmPackageCache> =  Lazy::new(CustomNpmPackageCache::default);
struct CustomNpmPackage {  pub registry_file: String,  pub tarballs: HashMap<String, Vec<u8>>,}
/// Creates tarballs and a registry json file for npm packages/// in the `testdata/npm/registry/@denotest` directory.#[derive(Default)]pub struct CustomNpmPackageCache(Mutex<HashMap<String, CustomNpmPackage>>);
impl CustomNpmPackageCache {  pub fn tarball_bytes(    &self,    name: &str,    version: &str,  ) -> Result<Option<Vec<u8>>> {    Ok(      self        .get_package_property(name, |p| p.tarballs.get(version).cloned())?        .flatten(),    )  }
  pub fn registry_file(&self, name: &str) -> Result<Option<Vec<u8>>> {    self.get_package_property(name, |p| p.registry_file.as_bytes().to_vec())  }
  fn get_package_property<TResult>(    &self,    package_name: &str,    func: impl FnOnce(&CustomNpmPackage) -> TResult,  ) -> Result<Option<TResult>> {    // it's ok if multiple threads race here as they will do the same work twice    if !self.0.lock().contains_key(package_name) {      match get_npm_package(package_name)? {        Some(package) => {          self.0.lock().insert(package_name.to_string(), package);        }        None => return Ok(None),      }    }    Ok(self.0.lock().get(package_name).map(func))  }}
fn get_npm_package(package_name: &str) -> Result<Option<CustomNpmPackage>> {  use ring::digest::Context;  use ring::digest::SHA512;
  let package_folder = testdata_path().join("npm/registry").join(package_name);  if !package_folder.exists() {    return Ok(None);  }
  // read all the package's versions  let mut tarballs = HashMap::new();  let mut versions = serde_json::Map::new();  let mut latest_version = semver::Version::parse("0.0.0").unwrap();  for entry in fs::read_dir(&package_folder)? {    let entry = entry?;    let file_type = entry.file_type()?;    if !file_type.is_dir() {      continue;    }    let version = entry.file_name().to_string_lossy().to_string();    let version_folder = package_folder.join(&version);
    // create the tarball    let mut tarball_bytes = Vec::new();    {      let mut encoder =        GzEncoder::new(&mut tarball_bytes, Compression::default());      {        let mut builder = Builder::new(&mut encoder);        builder          .append_dir_all("package", &version_folder)          .with_context(|| {            format!(              "Error adding tarball for directory: {}",              version_folder.display()            )          })?;        builder.finish()?;      }      encoder.finish()?;    }
    // get tarball hash    let mut hash_ctx = Context::new(&SHA512);    hash_ctx.update(&tarball_bytes);    let digest = hash_ctx.finish();    let tarball_checksum = base64::encode(digest.as_ref()).to_lowercase();
    // create the registry file JSON for this version    let mut dist = serde_json::Map::new();    dist.insert(      "integrity".to_string(),      format!("sha512-{}", tarball_checksum).into(),    );    dist.insert("shasum".to_string(), "dummy-value".into());    dist.insert(      "tarball".to_string(),      format!(        "http://localhost:4545/npm/registry/{}/{}.tgz",        package_name, version      )      .into(),    );
    tarballs.insert(version.clone(), tarball_bytes);    let package_json_path = version_folder.join("package.json");    let package_json_text = fs::read_to_string(&package_json_path)      .with_context(|| {        format!(          "Error reading package.json at {}",          package_json_path.display()        )      })?;    let mut version_info: serde_json::Map<String, serde_json::Value> =      serde_json::from_str(&package_json_text)?;    version_info.insert("dist".to_string(), dist.into());    versions.insert(version.clone(), version_info.into());    let version = semver::Version::parse(&version)?;    if version.cmp(&latest_version).is_gt() {      latest_version = version;    }  }
  let mut dist_tags = serde_json::Map::new();  dist_tags.insert("latest".to_string(), latest_version.to_string().into());
  // create the registry file for this package  let mut registry_file = serde_json::Map::new();  registry_file.insert("name".to_string(), package_name.to_string().into());  registry_file.insert("versions".to_string(), versions.into());  registry_file.insert("dist-tags".to_string(), dist_tags.into());  Ok(Some(CustomNpmPackage {    registry_file: serde_json::to_string(&registry_file).unwrap(),    tarballs,  }))}