[Zodb-checkins] CVS: Zope3/lib/python/ZODB - fsdump.py:1.6

[Jeremy Hylton]

Update of /cvs-repository/Zope3/lib/python/ZODB
In directory cvs.zope.org:/tmp/cvs-serv23649

Modified Files:
	fsdump.py 
Log Message:
Sync fsdump.py between ZODB3 and ZODB4,
adding Dumper class to ZODB4.


=== Zope3/lib/python/ZODB/fsdump.py 1.5 => 1.6 ===
--- Zope3/lib/python/ZODB/fsdump.py:1.5	Thu Aug  1 12:24:21 2002
+++ Zope3/lib/python/ZODB/fsdump.py	Tue Dec  3 13:46:30 2002
@@ -83,3 +83,80 @@
         print >> file
         i += 1
     iter.close()
+
+import struct
+from ZODB.FileStorage import TRANS_HDR, TRANS_HDR_LEN
+from ZODB.FileStorage import DATA_HDR, DATA_HDR_LEN
+
+def fmt(p64):
+    # Return a nicely formatted string for a packaged 64-bit value
+    return "%016x" % u64(p64)
+
+class Dumper:
+    """A very verbose dumper for debuggin FileStorage problems."""
+
+    def __init__(self, path, dest=None):
+        self.file = open(path, "rb")
+        self.dest = dest
+
+    def dump(self):
+        fid = self.file.read(4)
+        print >> self.dest, "*" * 60
+        print >> self.dest, "file identifier: %r" % fid
+        while self.dump_txn():
+            pass
+
+    def dump_txn(self):
+        pos = self.file.tell()
+        h = self.file.read(TRANS_HDR_LEN)
+        if not h:
+            return False
+        tid, stlen, status, ul, dl, el = struct.unpack(TRANS_HDR, h)
+        end = pos + u64(stlen)
+        print >> self.dest, "=" * 60
+        print >> self.dest, "offset: %d" % pos
+        print >> self.dest, "end pos: %d" % end
+        print >> self.dest, "transaction id: %s" % fmt(tid)
+        print >> self.dest, "trec len: %d" % u64(stlen)
+        print >> self.dest, "status: %r" % status
+        user = descr = extra = ""
+        if ul:
+            user = self.file.read(ul)
+        if dl:
+            descr = self.file.read(dl)
+        if el:
+            extra = self.file.read(el)
+        print >> self.dest, "user: %r" % user
+        print >> self.dest, "description: %r" % descr
+        print >> self.dest, "len(extra): %d" % el
+        while self.file.tell() < end:
+            self.dump_data(pos)
+        stlen2 = self.file.read(8)
+        print >> self.dest, "redundant trec len: %d" % u64(stlen2)
+        return True
+
+    def dump_data(self, tloc):
+        pos = self.file.tell()
+        h = self.file.read(DATA_HDR_LEN)
+        assert len(h) == DATA_HDR_LEN
+        oid, revid, sprev, stloc, vlen, sdlen = struct.unpack(DATA_HDR, h)
+        dlen = u64(sdlen)
+        print >> self.dest, "-" * 60
+        print >> self.dest, "offset: %d" % pos
+        print >> self.dest, "oid: %s" % fmt(oid)
+        print >> self.dest, "revid: %s" % fmt(revid)
+        print >> self.dest, "previous record offset: %d" % u64(sprev)
+        print >> self.dest, "transaction offset: %d" % u64(stloc)
+        if vlen:
+            pnv = self.file.read(8)
+            sprevdata = self.file.read(8)
+            version = self.file.read(vlen)
+            print >> self.dest, "version: %r" % version
+            print >> self.dest, "non-version data offset: %d" % u64(pnv)
+            print >> self.dest, \
+                  "previous version data offset: %d" % u64(sprevdata)
+        print >> self.dest, "len(data): %d" % dlen
+        self.file.read(dlen)
+        if not dlen:
+            sbp = self.file.read(8)
+            print >> self.dest, "backpointer: %d" % u64(sbp)