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use std::path::PathBuf;
use anyhow::Context;
use anyhow::Error;
use anyhow::Result;
use anyhow::anyhow;
use log::trace;
use url::Url;
use crate::package::Package;
use crate::package::PackageName;
use crate::package::PackageVersion;
use crate::package::Source;
#[derive(Clone, Debug)]
pub struct SourceCache {
root: PathBuf,
}
impl SourceCache {
pub fn new(root: PathBuf) -> Self {
SourceCache { root }
}
pub fn sources_for(&self, p: &Package) -> Vec<SourceEntry> {
SourceEntry::for_package(self.root.clone(), p)
}
}
#[derive(Debug)]
pub struct SourceEntry {
cache_root: PathBuf,
package_name: PackageName,
package_version: PackageVersion,
package_source_name: String,
package_source: Source,
}
impl SourceEntry {
fn source_file_path(&self) -> PathBuf {
self.source_file_directory().join(format!("{}-{}.source", self.package_source_name, self.package_source.hash().value()))
}
fn source_file_directory(&self) -> PathBuf {
self.cache_root.join(format!("{}-{}", self.package_name, self.package_version))
}
fn for_package(cache_root: PathBuf, package: &Package) -> Vec<Self> {
package.sources()
.clone()
.into_iter()
.map(|(source_name, source)| {
SourceEntry {
cache_root: cache_root.clone(),
package_name: package.name().clone(),
package_version: package.version().clone(),
package_source_name: source_name,
package_source: source,
}
})
.collect()
}
pub fn exists(&self) -> bool {
self.source_file_path().exists()
}
pub fn path(&self) -> PathBuf {
self.source_file_path()
}
pub fn url(&self) -> &Url {
self.package_source.url()
}
pub async fn remove_file(&self) -> Result<()> {
let p = self.source_file_path();
tokio::fs::remove_file(&p).await?;
Ok(())
}
pub async fn verify_hash(&self) -> Result<()> {
use tokio::io::AsyncReadExt;
let p = self.source_file_path();
trace!("Reading to buffer: {}", p.display());
let mut buf = vec![];
tokio::fs::OpenOptions::new()
.create(false)
.create_new(false)
.read(true)
.open(&p)
.await?
.read_to_end(&mut buf)
.await?;
trace!("Reading to buffer finished: {}", p.display());
self.package_source
.hash()
.matches_hash_of(&buf)
}
pub async fn create(&self) -> Result<tokio::fs::File> {
let p = self.source_file_path();
trace!("Creating source file: {}", p.display());
if !self.cache_root.is_dir() {
trace!("Cache root does not exist: {}", self.cache_root.display());
return Err(anyhow!("Cache root {} does not exist!", self.cache_root.display()))
}
{
let dir = self.source_file_directory();
if !dir.is_dir() {
trace!("Creating directory: {}", dir.display());
tokio::fs::create_dir(&dir)
.await
.with_context(|| {
anyhow!("Creating source cache directory for package {} {}: {}",
self.package_source_name,
self.package_source.hash().value(),
dir.display())
})?;
} else {
trace!("Directory exists: {}", dir.display());
}
}
trace!("Creating file now: {}", p.display());
tokio::fs::OpenOptions::new()
.create(true)
.create_new(true)
.write(true)
.open(&p)
.await
.with_context(|| anyhow!("Creating file: {}", p.display()))
.map_err(Error::from)
}
}
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