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Commit Graph

28 Commits

Author SHA1 Message Date
Michael Eischer
e734746f75 cache: forget cached file at most once
This is inspired by the circuit breaker pattern used for distributed
systems. If too many requests fails, then it is better to immediately
fail new requests for a limited time to give the backend time to
recover.

By only forgetting a file in the cache at most once, we can ensure that
a broken file is only retrieved once again from the backend. If the file
stored there is broken, previously it would be cached and deleted
continuously. Now, it is retrieved only once again, all later requests
just use the cached copy and either succeed or fail immediately.
2024-05-18 21:28:54 +02:00
Michael Eischer
97a307df1a cache: Always use cached file if it exists
A file is always cached whole. Thus, any out of bounds access will also
fail when directed at the backend. To handle case in which the cached
file is broken, then caller must call Cache.Forget(h) for the file in
question.
2024-05-18 21:28:54 +02:00
Michael Eischer
2ace242f36 repository: make reloading broken files explicit 2024-05-18 21:28:54 +02:00
Michael Eischer
e9390352a7 cache: code cleanups 2024-05-18 21:26:00 +02:00
Michael Eischer
47232bf8b0 backend: move LimitReadCloser to util package
The helper is only intended for usage by backend implementations.
2024-05-18 21:26:00 +02:00
Michael Eischer
6328b7e1f5 replace "too small" with "too short" in error messages 2024-05-18 19:59:26 +02:00
Michael Eischer
0747cf5319 cache: ignore ErrNotExist during cleanup of old files
Two restic processes running concurrently can try to remove the same
files from the cache. This could cause one process to fail with an error
if the other one has already remove a file that the current process also
tries to delete.
2024-04-10 19:25:51 +02:00
Michael Eischer
1b8a67fe76 move Backend interface to backend package 2023-10-25 23:00:18 +02:00
greatroar
72922a79ed cache: Replace readCloser+LimitedReader by backend.LimitedReadCloser 2023-01-03 19:03:36 +01:00
greatroar
d45a2475e1 cache: Rewrite unnecessary if-else 2022-12-03 12:13:54 +01:00
Michael Eischer
ff7ef5007e Replace most usages of ioutil with the underlying function
The ioutil functions are deprecated since Go 1.17 and only wrap another
library function. Thus directly call the underlying function.

This commit only mechanically replaces the function calls.
2022-12-02 19:36:43 +01:00
greatroar
9adae5521d cache: Call interface method once 2022-10-21 14:32:46 +02:00
Michael Eischer
ce902aac67 cache: Just try to open cache entry without calling stat first
Instead of first checking whether a file is in the repository cache and
then opening it, we just can open the file. This saves one stat call. If
the file is in the cache, everything is fine and otherwise the code
follows its normal fallback path.
2022-08-19 20:59:06 +02:00
Michael Eischer
8c11fc3ec9 crypto: move crypto buffer helpers 2022-07-17 13:42:23 +02:00
Michael Eischer
243698680a crypto: Use helpers for size calculations 2022-03-28 22:09:49 +02:00
greatroar
6586e90acf Modernize internal/cache error handling 2021-08-04 22:02:42 +02:00
greatroar
ea04f40eb3 Save cached files to a temporary location first 2021-08-04 22:02:42 +02:00
greatroar
673dda77c0 Less repetitive error messages in internal/cache
Many instances of errors.Wrap in this package would produce messages
like "Open: open <filename>: no such file or directory"; those now omit
the first "Open:" (or "Stat:", or "MkdirAll"). The function readVersion
now appends its own name to the error message, rather than the function
that failed, to make it easier to spot. Other function names (e.g.,
Load) are already added further up in the call chain.
2020-10-05 20:28:54 +02:00
greatroar
cb3f531050 Make Cache.Path private
It's only used inside the package.
2020-09-18 11:17:29 +02:00
greatroar
23fcbb275a Remove restic.Cache interface
It was used in one code path, which then asserted its concrete type as
*cache.Cache.

Privatised some of the interface methods.
2020-09-18 10:48:13 +02:00
Alexandr Bruyako
02014be76c simplified prefix removal, removed unnecessary if-else statements 2019-06-30 23:34:47 +03:00
Alexander Neumann
00597284de cache: Don't return an error for truncated files
Closes #1229
Closes #1328
2018-11-25 14:18:02 +01:00
Alexander Neumann
5dd0df0162 cache: Remove files from cache which are too small 2018-08-11 22:47:01 +02:00
George Armhold
bcdebfb84e small cleanup:
- be explicit when discarding returned errors from .Close(), etc.
- remove named return values from funcs when naked return not used
- fix some "err" shadowing when redeclaration not needed
2017-10-25 12:03:55 -04:00
Alexander Neumann
cebee0b8fa cache: Refuse to cache truncated files 2017-10-05 20:40:02 +02:00
Alexander Neumann
d81adcfaa5 cache: Add file name to error message 2017-10-05 19:30:56 +02:00
Alexander Neumann
e262f35d0a cache: Auto-remove invalid files 2017-09-24 23:11:47 +02:00
Alexander Neumann
9be24a1c9f Add cache
This commits adds rudimentary support for a cache directory, enabled by
default. The cache directory is created if it does not exist. The cache
is used if there's anything in it, newly created snapshot and index
files are written to the cache automatically.
2017-09-24 21:54:53 +02:00