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authorRichard Purdie <richard.purdie@linuxfoundation.org>2019-07-23 21:50:20 +0100
committerRichard Purdie <richard.purdie@linuxfoundation.org>2019-08-02 16:19:36 +0100
commit19a6e35600ae6d2d1bcecca6e68ab8c37674774e (patch)
treed95fbedf35abdf27b2625f0c9a2e58cd4e361627 /lib/bb/cache.py
parent7bb79099a6c1b463d6ae9226c4cab5e76a965675 (diff)
downloadbitbake-19a6e35600ae6d2d1bcecca6e68ab8c37674774e.tar.gz
cache: Add SimpleCache class
This adds a simple version of the MultiProcessCache which can be used to save and load cache data, useful for a new usecase we have in sigdata/runqueue. Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'lib/bb/cache.py')
-rw-r--r--lib/bb/cache.py53
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/bb/cache.py b/lib/bb/cache.py
index ab18dd5ea..233f99427 100644
--- a/lib/bb/cache.py
+++ b/lib/bb/cache.py
@@ -883,3 +883,56 @@ class MultiProcessCache(object):
p.dump([data, self.__class__.CACHE_VERSION])
bb.utils.unlockfile(glf)
+
+
+class SimpleCache(object):
+ """
+ BitBake multi-process cache implementation
+
+ Used by the codeparser & file checksum caches
+ """
+
+ def __init__(self, version):
+ self.cachefile = None
+ self.cachedata = None
+ self.cacheversion = version
+
+ def init_cache(self, d, cache_file_name=None, defaultdata=None):
+ cachedir = (d.getVar("PERSISTENT_DIR") or
+ d.getVar("CACHE"))
+ if not cachedir:
+ return defaultdata
+
+ bb.utils.mkdirhier(cachedir)
+ self.cachefile = os.path.join(cachedir,
+ cache_file_name or self.__class__.cache_file_name)
+ logger.debug(1, "Using cache in '%s'", self.cachefile)
+
+ glf = bb.utils.lockfile(self.cachefile + ".lock")
+
+ try:
+ with open(self.cachefile, "rb") as f:
+ p = pickle.Unpickler(f)
+ data, version = p.load()
+ except:
+ bb.utils.unlockfile(glf)
+ return defaultdata
+
+ bb.utils.unlockfile(glf)
+
+ if version != self.cacheversion:
+ return defaultdata
+
+ return data
+
+ def save(self, data):
+ if not self.cachefile:
+ return
+
+ glf = bb.utils.lockfile(self.cachefile + ".lock")
+
+ with open(self.cachefile, "wb") as f:
+ p = pickle.Pickler(f, -1)
+ p.dump([data, self.cacheversion])
+
+ bb.utils.unlockfile(glf)