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index.rs
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index.rs
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//! Raw access to the cache index. Use with caution!
use std::collections::HashSet;
use std::fs::{self, OpenOptions};
use std::hash::{Hash, Hasher};
use std::io::{ErrorKind, Write};
use std::path::{Path, PathBuf};
use std::time::{SystemTime, UNIX_EPOCH};
use digest::Digest;
use either::{Left, Right};
#[cfg(any(feature = "async-std", feature = "tokio"))]
use futures::stream::StreamExt;
use serde_derive::{Deserialize, Serialize};
use serde_json::Value;
use sha1::Sha1;
use sha2::Sha256;
use ssri::Integrity;
use walkdir::WalkDir;
#[cfg(any(feature = "async-std", feature = "tokio"))]
use crate::async_lib::{AsyncBufReadExt, AsyncWriteExt};
use crate::content::path::content_path;
use crate::errors::{IoErrorExt, Result};
use crate::put::WriteOpts;
const INDEX_VERSION: &str = "5";
/// Represents a cache index entry, which points to content.
#[derive(PartialEq, Debug)]
pub struct Metadata {
/// Key this entry is stored under.
pub key: String,
/// Integrity hash for the stored data. Acts as a key into {cache}/content.
pub integrity: Integrity,
/// Timestamp in unix milliseconds when this entry was written.
pub time: u128,
/// Size of data associated with this entry.
pub size: usize,
/// Arbitrary JSON associated with this entry.
pub metadata: Value,
/// Raw metadata in binary form. Can be different from JSON metadata.
pub raw_metadata: Option<Vec<u8>>,
}
#[derive(Deserialize, Serialize, Debug)]
struct SerializableMetadata {
key: String,
integrity: Option<String>,
time: u128,
size: usize,
metadata: Value,
raw_metadata: Option<Vec<u8>>,
}
impl PartialEq for SerializableMetadata {
fn eq(&self, other: &Self) -> bool {
self.key == other.key
}
}
impl Eq for SerializableMetadata {}
impl Hash for SerializableMetadata {
fn hash<H: Hasher>(&self, state: &mut H) {
self.key.hash(state);
}
}
/// Raw insertion into the cache index.
pub fn insert(cache: &Path, key: &str, opts: WriteOpts) -> Result<Integrity> {
let bucket = bucket_path(cache, key);
fs::create_dir_all(bucket.parent().unwrap()).with_context(|| {
format!(
"Failed to create index bucket directory: {:?}",
bucket.parent().unwrap()
)
})?;
let stringified = serde_json::to_string(&SerializableMetadata {
key: key.to_owned(),
integrity: opts.sri.clone().map(|x| x.to_string()),
time: opts.time.unwrap_or_else(now),
size: opts.size.unwrap_or(0),
metadata: opts.metadata.unwrap_or(serde_json::Value::Null),
raw_metadata: opts.raw_metadata,
})
.with_context(|| format!("Failed to serialize entry with key `{key}`"))?;
let mut buck = OpenOptions::new()
.create(true)
.append(true)
.open(&bucket)
.with_context(|| format!("Failed to create or open index bucket at {bucket:?}"))?;
let out = format!("\n{}\t{}", hash_entry(&stringified), stringified);
buck.write_all(out.as_bytes())
.with_context(|| format!("Failed to write to index bucket at {bucket:?}"))?;
buck.flush()
.with_context(|| format!("Failed to flush bucket at {bucket:?}"))?;
Ok(opts
.sri
.or_else(|| "sha1-deadbeef".parse::<Integrity>().ok())
.unwrap())
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
/// Asynchronous raw insertion into the cache index.
pub async fn insert_async<'a>(cache: &'a Path, key: &'a str, opts: WriteOpts) -> Result<Integrity> {
let bucket = bucket_path(cache, key);
crate::async_lib::create_dir_all(bucket.parent().unwrap())
.await
.with_context(|| {
format!(
"Failed to create index bucket directory: {:?}",
bucket.parent().unwrap()
)
})?;
let stringified = serde_json::to_string(&SerializableMetadata {
key: key.to_owned(),
integrity: opts.sri.clone().map(|x| x.to_string()),
time: opts.time.unwrap_or_else(now),
size: opts.size.unwrap_or(0),
metadata: opts.metadata.unwrap_or(serde_json::Value::Null),
raw_metadata: opts.raw_metadata,
})
.with_context(|| format!("Failed to serialize entry with key `{key}`"))?;
let mut buck = crate::async_lib::OpenOptions::new()
.create(true)
.append(true)
.open(&bucket)
.await
.with_context(|| format!("Failed to create or open index bucket at {bucket:?}"))?;
let out = format!("\n{}\t{}", hash_entry(&stringified), stringified);
buck.write_all(out.as_bytes())
.await
.with_context(|| format!("Failed to write to index bucket at {bucket:?}"))?;
buck.flush()
.await
.with_context(|| format!("Failed to flush bucket at {bucket:?}"))?;
Ok(opts
.sri
.or_else(|| "sha1-deadbeef".parse::<Integrity>().ok())
.unwrap())
}
/// Raw index Metadata access.
pub fn find(cache: &Path, key: &str) -> Result<Option<Metadata>> {
let bucket = bucket_path(cache, key);
Ok(bucket_entries(&bucket)
.with_context(|| format!("Failed to read index bucket entries from {bucket:?}"))?
.into_iter()
.fold(None, |acc, entry| {
if entry.key == key {
if let Some(integrity) = entry.integrity {
let integrity: Integrity = match integrity.parse() {
Ok(sri) => sri,
_ => return acc,
};
Some(Metadata {
key: entry.key,
integrity,
size: entry.size,
time: entry.time,
metadata: entry.metadata,
raw_metadata: entry.raw_metadata,
})
} else {
None
}
} else {
acc
}
}))
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
/// Asynchronous raw index Metadata access.
pub async fn find_async(cache: &Path, key: &str) -> Result<Option<Metadata>> {
let bucket = bucket_path(cache, key);
Ok(bucket_entries_async(&bucket)
.await
.with_context(|| format!("Failed to read index bucket entries from {bucket:?}"))?
.into_iter()
.fold(None, |acc, entry| {
if entry.key == key {
if let Some(integrity) = entry.integrity {
let integrity: Integrity = match integrity.parse() {
Ok(sri) => sri,
_ => return acc,
};
Some(Metadata {
key: entry.key,
integrity,
size: entry.size,
time: entry.time,
metadata: entry.metadata,
raw_metadata: entry.raw_metadata,
})
} else {
None
}
} else {
acc
}
}))
}
/// Deletes an index entry, without deleting the actual cache data entry.
pub fn delete(cache: &Path, key: &str) -> Result<()> {
insert(
cache,
key,
WriteOpts {
algorithm: None,
size: None,
sri: None,
time: None,
metadata: None,
raw_metadata: None,
},
)
.map(|_| ())
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
/// Asynchronously deletes an index entry, without deleting the actual cache
/// data entry.
pub async fn delete_async(cache: &Path, key: &str) -> Result<()> {
insert(
cache,
key,
WriteOpts {
algorithm: None,
size: None,
sri: None,
time: None,
metadata: None,
raw_metadata: None,
},
)
.map(|_| ())
}
/// Lists raw index Metadata entries.
pub fn ls(cache: &Path) -> impl Iterator<Item = Result<Metadata>> {
let cache_path = cache.join(format!("index-v{INDEX_VERSION}"));
let cloned = cache_path.clone();
WalkDir::new(&cache_path)
.into_iter()
.map(move |bucket| {
let bucket = bucket
.map_err(|e| match e.io_error() {
Some(io_err) => std::io::Error::new(io_err.kind(), io_err.kind().to_string()),
None => crate::errors::io_error("Unexpected error"),
})
.with_context(|| {
format!(
"Error while walking cache index directory at {}",
cloned.display()
)
})?;
if bucket.file_type().is_dir() {
return Ok(Vec::new());
}
let owned_path = bucket.path().to_owned();
Ok(bucket_entries(bucket.path())
.with_context(|| {
format!("Error getting bucket entries from {}", owned_path.display())
})?
.into_iter()
.rev()
.collect::<HashSet<SerializableMetadata>>()
.into_iter()
.filter_map(|se| {
if let Some(i) = se.integrity {
Some(Metadata {
key: se.key,
integrity: i.parse().unwrap(),
time: se.time,
size: se.size,
metadata: se.metadata,
raw_metadata: se.raw_metadata,
})
} else {
None
}
})
.collect())
})
.flat_map(|res| match res {
Ok(it) => Left(it.into_iter().map(Ok)),
Err(err) => Right(std::iter::once(Err(err))),
})
}
fn bucket_path(cache: &Path, key: &str) -> PathBuf {
let hashed = hash_key(key);
cache
.join(format!("index-v{INDEX_VERSION}"))
.join(&hashed[0..2])
.join(&hashed[2..4])
.join(&hashed[4..])
}
fn hash_key(key: &str) -> String {
let mut hasher = Sha1::new();
hasher.update(key);
hex::encode(hasher.finalize())
}
fn hash_entry(key: &str) -> String {
let mut hasher = Sha256::new();
hasher.update(key);
hex::encode(hasher.finalize())
}
fn now() -> u128 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap()
.as_millis()
}
fn bucket_entries(bucket: &Path) -> std::io::Result<Vec<SerializableMetadata>> {
use std::io::{BufRead, BufReader};
fs::File::open(bucket)
.map(|file| {
BufReader::new(file)
.lines()
.map_while(std::result::Result::ok)
.filter_map(|entry| {
let entry_str = match entry.split('\t').collect::<Vec<&str>>()[..] {
[hash, entry_str] if hash_entry(entry_str) == hash => entry_str,
// Something's wrong with the entry. Abort.
_ => return None,
};
serde_json::from_str::<SerializableMetadata>(entry_str).ok()
})
.collect()
})
.or_else(|err| {
if err.kind() == ErrorKind::NotFound {
Ok(Vec::new())
} else {
Err(err)?
}
})
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
async fn bucket_entries_async(bucket: &Path) -> std::io::Result<Vec<SerializableMetadata>> {
let file_result = crate::async_lib::File::open(bucket).await;
let file = if let Err(err) = file_result {
if err.kind() == ErrorKind::NotFound {
return Ok(Vec::new());
}
return Err(err)?;
} else {
file_result.unwrap()
};
let mut vec = Vec::new();
let mut lines =
crate::async_lib::lines_to_stream(crate::async_lib::BufReader::new(file).lines());
while let Some(line) = lines.next().await {
if let Ok(entry) = line {
let entry_str = match entry.split('\t').collect::<Vec<&str>>()[..] {
[hash, entry_str] if hash_entry(entry_str) == hash => entry_str,
// Something's wrong with the entry. Abort.
_ => continue,
};
if let Ok(serialized) = serde_json::from_str::<SerializableMetadata>(entry_str) {
vec.push(serialized);
}
}
}
Ok(vec)
}
/// Builder for options and flags for remove cache entry.
#[derive(Clone, Default)]
pub struct RemoveOpts {
pub(crate) remove_fully: bool,
}
impl RemoveOpts {
/// Creates cache remove options.
pub fn new() -> Self {
Default::default()
}
/// Set the remove fully option
/// If remove_fully is set to true then the index and content file itself will be physically deleted rather than appending a null.
pub fn remove_fully(mut self, remove_fully: bool) -> Self {
self.remove_fully = remove_fully;
self
}
/// Removes an individual index metadata entry.
/// If remove_fully is set to false (default), the associated content will be left in the cache.
/// If remove_fully is true, both the index entry and the contents will be physically removed from the disk
pub fn remove_sync<P, K>(self, cache: P, key: K) -> Result<()>
where
P: AsRef<Path>,
K: AsRef<str>,
{
if !self.remove_fully {
delete(cache.as_ref(), key.as_ref())
} else {
if let Some(meta) = crate::metadata_sync(cache.as_ref(), key.as_ref())? {
let content = content_path(cache.as_ref(), &meta.integrity);
fs::remove_file(&content)
.with_context(|| format!("Failed to remove content at {content:?}"))?;
}
let bucket = bucket_path(cache.as_ref(), key.as_ref());
fs::remove_file(&bucket)
.with_context(|| format!("Failed to remove bucket at {bucket:?}"))
}
}
/// Removes an individual index metadata entry.
/// If remove_fully is set to false (default), the associated content will be left in the cache.
/// If remove_fully is true, both the index entry and the contents will be physically removed from the disk
#[cfg(any(feature = "async-std", feature = "tokio"))]
pub async fn remove<P, K>(self, cache: P, key: K) -> Result<()>
where
P: AsRef<Path>,
K: AsRef<str>,
{
if !self.remove_fully {
delete_async(cache.as_ref(), key.as_ref()).await
} else {
if let Some(meta) = crate::metadata(cache.as_ref(), key.as_ref()).await? {
let content = content_path(cache.as_ref(), &meta.integrity);
crate::async_lib::remove_file(&content)
.await
.with_context(|| format!("Failed to remove content at {content:?}"))?;
}
let bucket = bucket_path(cache.as_ref(), key.as_ref());
crate::async_lib::remove_file(&bucket)
.await
.with_context(|| format!("Failed to remove bucket at {bucket:?}"))
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::json;
#[cfg(feature = "async-std")]
use async_attributes::test as async_test;
#[cfg(feature = "tokio")]
use tokio::test as async_test;
const MOCK_ENTRY: &str = "\n9cbbfe2553e7c7e1773f53f0f643fdd72008faa38da53ebcb055e5e20321ae47\t{\"key\":\"hello\",\"integrity\":\"sha1-deadbeef\",\"time\":1234567,\"size\":0,\"metadata\":null,\"raw_metadata\":null}";
fn ls_entries(dir: &Path) -> Vec<String> {
let mut entries = ls(dir)
.map(|x| Ok(x?.key))
.collect::<Result<Vec<_>>>()
.unwrap();
entries.sort();
entries
}
#[test]
fn insert_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri).time(time);
insert(&dir, "hello", opts).unwrap();
let entry = std::fs::read_to_string(bucket_path(&dir, "hello")).unwrap();
assert_eq!(entry, MOCK_ENTRY);
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
#[async_test]
async fn insert_async_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri).time(time);
futures::executor::block_on(async {
insert_async(&dir, "hello", opts).await.unwrap();
});
let entry = std::fs::read_to_string(bucket_path(&dir, "hello")).unwrap();
assert_eq!(entry, MOCK_ENTRY);
}
#[test]
fn find_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let bucket = bucket_path(&dir, "hello");
fs::create_dir_all(bucket.parent().unwrap()).unwrap();
fs::write(bucket, MOCK_ENTRY).unwrap();
let entry = find(&dir, "hello").unwrap().unwrap();
assert_eq!(
entry,
Metadata {
key: String::from("hello"),
integrity: sri,
time,
size: 0,
metadata: json!(null),
raw_metadata: None,
}
);
}
#[test]
fn find_none() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
assert_eq!(find(&dir, "hello").unwrap(), None);
}
#[test]
fn delete_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri).time(time);
insert(&dir, "hello", opts).unwrap();
delete(&dir, "hello").unwrap();
assert_eq!(find(&dir, "hello").unwrap(), None);
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
#[async_test]
async fn delete_async_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri).time(time);
insert(&dir, "hello", opts).unwrap();
futures::executor::block_on(async {
delete_async(&dir, "hello").await.unwrap();
});
assert_eq!(find(&dir, "hello").unwrap(), None);
}
#[test]
fn delete_fully() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let content = content_path(&dir, &"sha1-deadbeef".parse().unwrap());
fs::create_dir_all(content.parent().unwrap()).unwrap();
fs::write(content.as_path(), "hello").unwrap();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
insert(&dir, "hello", WriteOpts::new().integrity(sri).time(time)).unwrap();
RemoveOpts::new()
.remove_fully(true)
.remove_sync(&dir, "hello")
.unwrap();
assert_eq!(find(&dir, "hello").unwrap(), None);
assert!(!content.exists());
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
#[async_test]
async fn delete_fully_async() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let content = content_path(&dir, &"sha1-deadbeef".parse().unwrap());
fs::create_dir_all(content.parent().unwrap()).unwrap();
fs::write(content.as_path(), "hello").unwrap();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
insert(&dir, "hello", WriteOpts::new().integrity(sri).time(time)).unwrap();
RemoveOpts::new()
.remove_fully(true)
.remove(&dir, "hello")
.await
.unwrap();
assert_eq!(find(&dir, "hello").unwrap(), None);
assert!(!content.exists());
}
#[test]
fn round_trip() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri.clone()).time(time);
insert(&dir, "hello", opts).unwrap();
let entry = find(&dir, "hello").unwrap().unwrap();
assert_eq!(
entry,
Metadata {
key: String::from("hello"),
integrity: sri,
time,
size: 0,
metadata: json!(null),
raw_metadata: None,
}
);
}
#[cfg(any(feature = "async-std", feature = "tokio"))]
#[async_test]
async fn round_trip_async() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri.clone()).time(time);
futures::executor::block_on(async {
insert_async(&dir, "hello", opts).await.unwrap();
});
let entry = futures::executor::block_on(async {
find_async(&dir, "hello").await.unwrap().unwrap()
});
assert_eq!(
entry,
Metadata {
key: String::from("hello"),
integrity: sri,
time,
size: 0,
metadata: json!(null),
raw_metadata: None,
}
);
}
#[test]
fn ls_basic() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri.clone()).time(time);
insert(&dir, "hello", opts).unwrap();
let opts = WriteOpts::new().integrity(sri).time(time);
insert(&dir, "world", opts).unwrap();
let entries = ls_entries(&dir);
assert_eq!(entries, vec![String::from("hello"), String::from("world")])
}
#[test]
fn ls_basic_with_delete() {
let tmp = tempfile::tempdir().unwrap();
let dir = tmp.path().to_owned();
let sri: Integrity = "sha1-deadbeef".parse().unwrap();
let time = 1_234_567;
let opts = WriteOpts::new().integrity(sri.clone()).time(time);
insert(&dir, "hello", opts).unwrap();
let opts = WriteOpts::new().integrity(sri).time(time);
insert(&dir, "world", opts).unwrap();
let entries = ls_entries(&dir);
assert_eq!(entries, vec![String::from("hello"), String::from("world")]);
delete(&dir, "hello").unwrap();
let entries = ls_entries(&dir);
assert_eq!(entries, vec![String::from("world")])
}
}