This is a more complicated functionality (implementation-wise) of the
`Entries` iterator, which allows a callee to transform it into a
`StoreIdIterator`.
It uses the crate internal `PathIterator` type and a function to extract
the internals of that iterator which is then turned into an iterator
over `Result<StoreId>`, which can be used to build a `StoreIdIterator`.
The implementation is ugly, but we need to be able to transform a
`Entries` iterator into a `StoreIdIterator` in the
`libimagentryannotation`, and possibly in more cases where we want to be
agnostic over iterators.
Maybe there is a cleaner solution to this, hence the comment about
whether this should be removed.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
With this change applied, libimagstore does not export backend
representing types anymore.
This change is necessar because when we want to switch the `StoreId`
implementation from "complex and stateful" to "Stateless and Cow<'_,
&str>", we need to be able to have a type which represents a "`StoreId`
plus the path of the Store itself".
This "the path of the Store itself" is passed around as reference, to
minimize runtime impact.
Because such a type should not be exported by the libimagstore crate, we
make it `pub(crate)` internally. But because the backend APIs also have
to use this type, we would export the (private) type in the APIs of the
backend.
Because of that we make the backend API also non-visible to crate users,
which also decreases the surface of the libimagstore API itself.
Besides:
Remove function `Link::with_base()` which is not needed anymore (was
used in tests only).
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This changes the implementation of the StoreId type to be less complex.
Before we always had to re-attach the path of the store itself each time
a StoreId object was passed to the store. Now we do not do this anymore,
hopefully we can move to a implementation of the Store API which takes
references of StoreId objects in the future.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This patch fixes a bug where the following code (here pseudocode) did
the wrong thing:
store.entries().in_collection("foo").for_each(||...)
because the `.in_collection()` call for the underlying PathIterator
object did not actually re-build the iterator. It only changed the
contained `PathIterBuilder`, but did not call `.build_iter()` on it to
rebuild the iterator object.
The test added with this patch checks whether the iterator does the
right thing.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
::stf::fs::create_dir_all() takes any ref to `Path`, which is what we
have here, so we can leave out the allocation of a new PathBuf object
here.
Also remove the match by a `if let Some(_)`, which increases the
readability a bit.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
With this change, the cache is tested before accessing the filesystem,
which probably increases the speed if the cache has the entry, because
we avoid the slow IO operation.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This fixes a really ugly bug where the in-memory backend for the store
did not remove the entry from the in-memory hashmap on "move", but
simply copied it from the old location to the new one.
That caused tests to fail after the fixes introduced for the
Store::get() function which checked the filesystem and the internal
cache whether an entry exists before the actual "get" operation, because
an old entry would still exist after a move (only in the testcases).
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Fixes: 09e8619cf5 ("libimagstore: Move from error-chain to failure")
This changes the implementation of Debug for the FileLockEntry to be
more explanatory of how the entry actually looks like. It does not only
print the path of the store anymore, but also the location of the Entry.
Printing header and content would be still too much, tho.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
for safely creating a `String` object from `StoreId` which can be shown
to the user.
Mainly introduced because this is useful for error handling (when
putting a `StoreId` into an error kind, the compiler complains that
`StoreId` does not meet the required trait bounds. But `String` does and
we do not process the ID any further anyways).
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
The implementation of the in-memory filesystem for testing imag code did
not actually use `HashMap::remove()` when an entry was moved, but
`HashMap::get().cloned()`, which caused the original entry to exist
_after_ the move.
I'm not sure why this did not fail much earlier, but it was clearly
wrong. This commit adjust the test to check the "filesystem" before
checking the store and fixes the bug.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This actually caused tests to fail if there was indeed a file at
/tmp/store/test and the test tried to create a "test" entry in the store.
Do use backend instead to check whether entry actually exists.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
The previous iterator was implemented to simply fetch _all_ pathes from
the filesystem, no matter what.
With this implementation, this changes. The iterator now has
functionality to optimize the iteration, if only a subdirectory of the
store is required, for example `$STORE/foo`.
This is done via functionality where the underlying iterator gets
altered.
First of all, the interface was changed to return a `Entries` object,
which itself only covers the libimagstore-internal `PathIterator` type.
This type was changed so that the backend implementation provides an
"PathIterBuilder`, which builds the actual iterator object for the
`PathIterator` type.
The intermediate `StoreIdConstructingIterator` was merged into
`PathIterator` for simplicity.
The `Entries` type got functionality similar to the
`StoreIdIteratorWithStore` type for easier transition to the new API.
This should probably be removed at a later point, though.
As the `walkdir::WalkDir` type is not as nice as it could be, iterators
for two collections in the store could be built like this (untested):
store
.entries()?
.in_collection("foo")
.chain(store.entries()?.in_collection("bar"))
Functionality to exclude subdirectories is not possible with the current
`walkdir::WalkDir` implementation and has to be done during iteration,
with filtering (as usual).
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This patch changes the filesystem-backend implementation of libimagstore
to open files on each read/write rather than holding the file handle in
memory at all times.
Whenever a lot of imag store entries are read into memory, the imag
process may ran out of file descriptors. With this patch applied, a
`Store::get()` call on an entry which is not yet in the store cache
would cause the file to be read, but the FD being dropped after that.
Likewise, a `Store::update()` (which is also called if the imag entry is
dropped) would re-open the file on the filesystem and write the contents
from the imag store cache back to the file.
With this patch, opening hundrets or thousands of imag entries should be
no problem anymore, only the available memory should be a limit then.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
This patch fixes a bug we did not even hit (yet). It is: When deleting
an Entry from the store, this could potentially leave artifacts in the
cache.
Szenario: An Entry, which was loaded (via `Store::get()` for example),
gets `Store::delete()`ed twice. The first call would work as expected,
but leave the Entry in the Store cache. The second call would then fail,
as the Entry is already removed on the FS, but still in the cache. This
would fail - which is the right thing to do here - but with the wrong
error (with a FileError rather than a FileNotFound error).
This patch fixes this.
First of all, the appropriate `PathBuf` object is calculated in all
cases, as this object is needed to check whether the file is actually
there (which could be the case if the Entry is in the cache and if it is
not).
If the entry is in the cache and is borrowed: error. If not, remove the
entry from the cache. Afterwards the file is deleted on disk.
If the entry is not in the cache, but the file exists, the file is removed.
If the file does not exist: error.
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
