persist_data: implement comparison, same as dict

(Bitbake rev: 1190406c526c7bb7cf415867be83e0403812a7dd)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 25 insertions, 44 deletions

diff --git a/bitbake/lib/bb/fetch/git.py b/bitbake/lib/bb/fetch/git.py
index 35908ca..9a51ed1 100644
--- a/bitbake/lib/bb/fetch/git.py
+++ b/bitbake/lib/bb/fetch/git.py
@@ -242,8 +242,7 @@ class Git(Fetch):
         """
         Look in the cache for the latest revision, if not present ask the SCM.
         """
-        persisted = bb.persist_data.persist(d)
-        revs = persisted['BB_URI_HEADREVS']
+        revs = bb.persist_data.persist('BB_URI_HEADREVS', d)
 
         key = self.generate_revision_key(url, ud, d, branch=True)
 
@@ -265,8 +264,7 @@ class Git(Fetch):
         """
 
         """
-        pd = bb.persist_data.persist(d)
-        localcounts = pd['BB_URI_LOCALCOUNT']
+        localcounts = bb.persist_data.persist('BB_URI_LOCALCOUNT', d)
         key = self.generate_revision_key(url, ud, d, branch=True)
         oldkey = self.generate_revision_key(url, ud, d, branch=False)
 
diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index a31e26b..27fcc3c 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -222,18 +222,18 @@ def fetcher_init(d):
     Called to initialize the fetchers once the configuration data is known.
     Calls before this must not hit the cache.
     """
-    pd = persist_data.persist(d)
     # When to drop SCM head revisions controlled by user policy
     srcrev_policy = bb.data.getVar('BB_SRCREV_POLICY', d, True) or "clear"
     if srcrev_policy == "cache":
         logger.debug(1, "Keeping SRCREV cache due to cache policy of: %s", srcrev_policy)
     elif srcrev_policy == "clear":
         logger.debug(1, "Clearing SRCREV cache due to cache policy of: %s", srcrev_policy)
+        revs = bb.persist_data.persist('BB_URI_HEADREVS', d)
         try:
-            bb.fetch2.saved_headrevs = pd['BB_URI_HEADREVS'].items()
+            bb.fetch2.saved_headrevs = revs.items()
         except:
             pass
-        del pd['BB_URI_HEADREVS']
+        revs.clear()
     else:
         raise FetchError("Invalid SRCREV cache policy of: %s" % srcrev_policy)
 
@@ -247,8 +247,7 @@ def fetcher_compare_revisions(d):
     return true/false on whether they've changed.
     """
 
-    pd = persist_data.persist(d)
-    data = pd['BB_URI_HEADREVS'].items()
+    data = bb.persist_data.persist('BB_URI_HEADREVS', d).items()
     data2 = bb.fetch2.saved_headrevs
 
     changed = False
@@ -803,8 +802,7 @@ class FetchMethod(object):
         if not hasattr(self, "_latest_revision"):
             raise ParameterError("The fetcher for this URL does not support _latest_revision", url)
 
-        pd = persist_data.persist(d)
-        revs = pd['BB_URI_HEADREVS']
+        revs = bb.persist_data.persist('BB_URI_HEADREVS', d)
         key = self.generate_revision_key(url, ud, d, name)
         try:
             return revs[key]
@@ -819,8 +817,7 @@ class FetchMethod(object):
         if hasattr(self, "_sortable_revision"):
             return self._sortable_revision(url, ud, d)
 
-        pd = persist_data.persist(d)
-        localcounts = pd['BB_URI_LOCALCOUNT']
+        localcounts = bb.persist_data.persist('BB_URI_LOCALCOUNT', d)
         key = self.generate_revision_key(url, ud, d, name)
 
         latest_rev = self._build_revision(url, ud, d, name)
diff --git a/bitbake/lib/bb/persist_data.py b/bitbake/lib/bb/persist_data.py
index c9e80ba..0ed0cd2 100644
--- a/bitbake/lib/bb/persist_data.py
+++ b/bitbake/lib/bb/persist_data.py
@@ -26,7 +26,8 @@ import logging
 import os.path
 import sys
 import warnings
-import bb.msg, bb.data, bb.utils
+from bb.compat import total_ordering
+from collections import Mapping
 
 try:
     import sqlite3
@@ -43,6 +44,7 @@ if hasattr(sqlite3, 'enable_shared_cache'):
     sqlite3.enable_shared_cache(True)
 
 
+@total_ordering
 class SQLTable(collections.MutableMapping):
     """Object representing a table/domain in the database"""
     def __init__(self, cursor, table):
@@ -105,6 +107,10 @@ class SQLTable(collections.MutableMapping):
         for row in data:
             yield row[0]
 
+    def __lt__(self, other):
+        if not isinstance(other, Mapping):
+            raise NotImplemented
+
     def iteritems(self):
         data = self._execute("SELECT * FROM %s;" % self.table)
         for row in data:
@@ -118,33 +124,8 @@ class SQLTable(collections.MutableMapping):
     def has_key(self, key):
         return key in self
 
-
-class SQLData(object):
-    """Object representing the persistent data"""
-    def __init__(self, filename):
-        bb.utils.mkdirhier(os.path.dirname(filename))
-
-        self.filename = filename
-        self.connection = sqlite3.connect(filename, timeout=5,
-                                          isolation_level=None)
-        self.cursor = self.connection.cursor()
-        self._tables = {}
-
-    def __getitem__(self, table):
-        if not isinstance(table, basestring):
-            raise TypeError("table argument must be a string, not '%s'" %
-                            type(table))
-
-        if table in self._tables:
-            return self._tables[table]
-        else:
-            tableobj = self._tables[table] = SQLTable(self.cursor, table)
-            return tableobj
-
-    def __delitem__(self, table):
-        if table in self._tables:
-            del self._tables[table]
-        self.cursor.execute("DROP TABLE IF EXISTS %s;" % table)
+    def clear(self):
+        self._execute("DELETE FROM %s;" % self.table)
 
 
 class PersistData(object):
@@ -194,14 +175,19 @@ class PersistData(object):
         """
         del self.data[domain][key]
 
+def connect(database):
+    return sqlite3.connect(database, timeout=30, isolation_level=None)
 
-def persist(d):
-    """Convenience factory for construction of SQLData based upon metadata"""
+def persist(domain, d):
+    """Convenience factory for SQLTable objects based upon metadata"""
+    import bb.data, bb.utils
     cachedir = (bb.data.getVar("PERSISTENT_DIR", d, True) or
                 bb.data.getVar("CACHE", d, True))
     if not cachedir:
         logger.critical("Please set the 'PERSISTENT_DIR' or 'CACHE' variable")
         sys.exit(1)
 
+    bb.utils.mkdirhier(cachedir)
     cachefile = os.path.join(cachedir, "bb_persist_data.sqlite3")
-    return SQLData(cachefile)
+    connection = connect(cachefile)
+    return SQLTable(connection, domain)