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Add Store::exists() for checking whether a StoreId exists as Entry 

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This commit is contained in:
Matthias Beyer 2018-12-13 01:27:12 +01:00
parent ccd8e94fbf
commit 4fe7fd366c
1 changed files with 17 additions and 15 deletions
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32
lib/core/libimagstore/src/store.rs
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@ -222,13 +222,7 @@ impl Store {
debug!("Creating id: '{}'", id);
let exists =
self.entries
.read()
.map(|map| map.contains_key(&id))
.map_err(|_| Error::from(EM::LockError))
.context(format_err!("CreateCallError: {}", id))? ||
self.backend.exists(&id.clone().into_pathbuf()?)?;
let exists = self.exists(id.clone())?;
if exists {
debug!("Entry exists: {:?}", id);
@ -306,14 +300,7 @@ impl Store {
debug!("Getting id: '{}'", id);
let exists =
self.entries
.read()
.map(|map| map.contains_key(&id))
.map_err(|_| Error::from(EM::LockError))
.context(format_err!("CreateCallError: {}", id))? ||
self.backend.exists(&id.clone().into_pathbuf()?)?;
let exists = self.exists(id.clone())?;
if !exists {
debug!("Does not exist in internal cache or filesystem: {:?}", id);
@ -648,6 +635,21 @@ impl Store {
.map(|i| Entries::new(i, self))
}
/// Check whether the store has the Entry pointed to by the StoreId `id`
pub fn exists<'a>(&'a self, id: StoreId) -> Result<bool> {
let cache_has_entry = |id: &StoreId|
self.entries
.read()
.map(|map| map.contains_key(id))
.map_err(|_| Error::from(EM::LockError))
.context(format_err!("CreateCallError: {}", id));
let backend_has_entry = |id: StoreId|
self.backend.exists(&id.with_base(self.path().to_path_buf()).into_pathbuf()?);
Ok(cache_has_entry(&id)? || backend_has_entry(id)?)
}
/// Gets the path where this store is on the disk
pub fn path(&self) -> &PathBuf {
&self.location