[Zodb-checkins] CVS: Zope/lib/python/ZEO - ClientCache.py:1.44 stats.py:1.21

Shane Hathaway shane at zope.com
Tue Jun 10 14:08:41 EDT 2003


Update of /cvs-repository/Zope/lib/python/ZEO
In directory cvs.zope.org:/tmp/cvs-serv11919

Modified Files:
	ClientCache.py stats.py 
Log Message:
Merged shane-oid-length-branch.

The ZEO client cache now works with OIDs of length up to 65535 bytes.
Also added some sanity checks that check the size of the data being written,
since there are some hard limits.


=== Zope/lib/python/ZEO/ClientCache.py 1.43 => 1.44 ===
--- Zope/lib/python/ZEO/ClientCache.py:1.43	Tue Jan  7 17:39:53 2003
+++ Zope/lib/python/ZEO/ClientCache.py	Tue Jun 10 13:08:10 2003
@@ -44,7 +44,9 @@
 
   offset in record: name -- description
 
-  0: oid -- 8-byte object id
+  0: oidlen -- 2-byte unsigned object id length
+
+  2: reserved (6 bytes)
 
   8: status -- 1-byte status 'v': valid, 'n': non-version valid, 'i': invalid
                ('n' means only the non-version data in the record is valid)
@@ -57,23 +59,25 @@
 
   19: serial -- 8-byte non-version serial (timestamp)
 
-  27: data -- non-version data
+  27: oid -- object id
+
+  27+oidlen: data -- non-version data
 
-  27+dlen: version -- Version string (if vlen > 0)
+  27+oidlen+dlen: version -- Version string (if vlen > 0)
 
-  27+dlen+vlen: vdlen -- 4-byte length of version data (if vlen > 0)
+  27+oidlen+dlen+vlen: vdlen -- 4-byte length of version data (if vlen > 0)
 
-  31+dlen+vlen: vdata -- version data (if vlen > 0)
+  31+oidlen+dlen+vlen: vdata -- version data (if vlen > 0)
 
-  31+dlen+vlen+vdlen: vserial -- 8-byte version serial (timestamp)
+  31+oidlen+dlen+vlen+vdlen: vserial -- 8-byte version serial (timestamp)
                                  (if vlen > 0)
 
-  27+dlen (if vlen == 0) **or**
-  39+dlen+vlen+vdlen: tlen -- 4-byte (unsigned) record length (for
-                              redundancy and backward traversal)
+  27+oidlen+dlen (if vlen == 0) **or**
+  39+oidlen+dlen+vlen+vdlen: tlen -- 4-byte (unsigned) record length (for
+                                     redundancy and backward traversal)
 
-  31+dlen (if vlen == 0) **or**
-  43+dlen+vlen+vdlen: -- total record length (equal to tlen)
+  31+oidlen+dlen (if vlen == 0) **or**
+  43+oidlen+dlen+vlen+vdlen: -- total record length (equal to tlen)
 
 There is a cache size limit.
 
@@ -111,12 +115,12 @@
 from struct import pack, unpack
 from thread import allocate_lock
 
-from ZODB.utils import U64
+from ZODB.utils import oid_repr
 
 import zLOG
 from ZEO.ICache import ICache
 
-magic = 'ZEC1'
+magic = 'ZEC2'
 headersize = 12
 
 MB = 1024**2
@@ -293,15 +297,17 @@
             f.seek(ap)
             h = f.read(27)
             if len(h) != 27:
-                self.log("invalidate: short record for oid %16x "
+                self.log("invalidate: short record for oid %s "
                          "at position %d in cache file %d"
-                         % (U64(oid), ap, p < 0))
+                         % (oid_repr(oid), ap, p < 0))
                 del self._index[oid]
                 return None
-            if h[:8] != oid:
-                self.log("invalidate: oid mismatch: expected %16x read %16x "
+            oidlen = unpack(">H", h[:2])[0]
+            rec_oid = f.read(oidlen)
+            if rec_oid != oid:
+                self.log("invalidate: oid mismatch: expected %s read %s "
                          "at position %d in cache file %d"
-                         % (U64(oid), U64(h[:8]), ap, p < 0))
+                         % (oid_repr(oid), oid_repr(rec_oid), ap, p < 0))
                 del self._index[oid]
                 return None
             f.seek(ap+8) # Switch from reading to writing
@@ -329,14 +335,16 @@
             read = f.read
             seek(ap)
             h = read(27)
-            if len(h)==27 and h[8] in 'nv' and h[:8]==oid:
+            oidlen = unpack(">H", h[:2])[0]
+            rec_oid = read(oidlen)
+            if len(h)==27 and h[8] in 'nv' and rec_oid == oid:
                 tlen, vlen, dlen = unpack(">iHi", h[9:19])
             else:
                 tlen = -1
             if tlen <= 0 or vlen < 0 or dlen < 0 or vlen+dlen > tlen:
-                self.log("load: bad record for oid %16x "
+                self.log("load: bad record for oid %s "
                          "at position %d in cache file %d"
-                         % (U64(oid), ap, p < 0))
+                         % (oid_repr(oid), ap, p < 0))
                 del self._index[oid]
                 return None
 
@@ -355,7 +363,8 @@
                     data = read(dlen)
                     self._trace(0x2A, oid, version, h[19:], dlen)
                     if (p < 0) != self._current:
-                        self._copytocurrent(ap, tlen, dlen, vlen, h, data)
+                        self._copytocurrent(ap, oidlen, tlen, dlen, vlen, h,
+                                            oid, data)
                     return data, h[19:]
                 else:
                     self._trace(0x26, oid, version)
@@ -367,12 +376,12 @@
             v = vheader[:-4]
             if version != v:
                 if dlen:
-                    seek(ap+27)
+                    seek(ap+27+oidlen)
                     data = read(dlen)
                     self._trace(0x2C, oid, version, h[19:], dlen)
                     if (p < 0) != self._current:
-                        self._copytocurrent(ap, tlen, dlen, vlen, h,
-                                            data, vheader)
+                        self._copytocurrent(ap, oidlen, tlen, dlen, vlen, h,
+                                            oid, data, vheader)
                     return data, h[19:]
                 else:
                     self._trace(0x28, oid, version)
@@ -383,13 +392,13 @@
             vserial = read(8)
             self._trace(0x2E, oid, version, vserial, vdlen)
             if (p < 0) != self._current:
-                self._copytocurrent(ap, tlen, dlen, vlen, h,
-                                    None, vheader, vdata, vserial)
+                self._copytocurrent(ap, oidlen, tlen, dlen, vlen, h,
+                                    oid, None, vheader, vdata, vserial)
             return vdata, vserial
         finally:
             self._release()
 
-    def _copytocurrent(self, pos, tlen, dlen, vlen, header,
+    def _copytocurrent(self, pos, oidlen, tlen, dlen, vlen, header, oid,
                        data=None, vheader=None, vdata=None, vserial=None):
         """Copy a cache hit from the non-current file to the current file.
 
@@ -403,26 +412,27 @@
         if header[8] == 'n':
             # Rewrite the header to drop the version data.
             # This shortens the record.
-            tlen = 31 + dlen
+            tlen = 31 + oidlen + dlen
             vlen = 0
-            # (oid:8, status:1, tlen:4, vlen:2, dlen:4, serial:8)
+            # (oidlen:2, reserved:6, status:1, tlen:4,
+            #  vlen:2, dlen:4, serial:8)
             header = header[:9] + pack(">IHI", tlen, vlen, dlen) + header[-8:]
         else:
             assert header[8] == 'v'
         f = self._f[not self._current]
         if data is None:
-            f.seek(pos+27)
+            f.seek(pos+27+oidlen)
             data = f.read(dlen)
             if len(data) != dlen:
                 return
-        l = [header, data]
+        l = [header, oid, data]
         if vlen:
             assert vheader is not None
             l.append(vheader)
             assert (vdata is None) == (vserial is None)
             if vdata is None:
                 vdlen = unpack(">I", vheader[-4:])[0]
-                f.seek(pos+27+dlen+vlen+4)
+                f.seek(pos+27+oidlen+dlen+vlen+4)
                 vdata = f.read(vdlen)
                 if len(vdata) != vdlen:
                     return
@@ -438,13 +448,12 @@
         g.seek(self._pos)
         g.writelines(l)
         assert g.tell() == self._pos + tlen
-        oid = header[:8]
         if self._current:
             self._index[oid] = - self._pos
         else:
             self._index[oid] = self._pos
         self._pos += tlen
-        self._trace(0x6A, header[:8], vlen and vheader[:-4] or '',
+        self._trace(0x6A, oid, vlen and vheader[:-4] or '',
                     vlen and vserial or header[-8:], dlen)
 
     def update(self, oid, serial, version, data):
@@ -462,7 +471,9 @@
                 read = f.read
                 seek(ap)
                 h = read(27)
-                if len(h)==27 and h[8] in 'nv' and h[:8]==oid:
+                oidlen = unpack(">H", h[:2])[0]
+                rec_oid = read(oidlen)
+                if len(h) == 27 and h[8] in 'nv' and rec_oid == oid:
                     tlen, vlen, dlen = unpack(">iHi", h[9:19])
                 else:
                     return self._store(oid, '', '', version, data, serial)
@@ -500,14 +511,16 @@
             read = f.read
             seek(ap)
             h = read(27)
-            if len(h)==27 and h[8] in 'nv' and h[:8]==oid:
+            oidlen = unpack(">H", h[:2])[0]
+            rec_oid = read(oidlen)
+            if len(h) == 27 and h[8] in 'nv' and rec_oid == oid:
                 tlen, vlen, dlen = unpack(">iHi", h[9:19])
             else:
                 tlen = -1
             if tlen <= 0 or vlen < 0 or dlen < 0 or vlen+dlen > tlen:
-                self.log("modifiedInVersion: bad record for oid %16x "
+                self.log("modifiedInVersion: bad record for oid %s "
                          "at position %d in cache file %d"
-                         % (U64(oid), ap, p < 0))
+                         % (oid_repr(oid), ap, p < 0))
                 del self._index[oid]
                 return None
 
@@ -579,7 +592,7 @@
         if not s:
             p = ''
             s = '\0\0\0\0\0\0\0\0'
-        tlen = 31 + len(p)
+        tlen = 31 + len(oid) + len(p)
         if version:
             tlen = tlen + len(version) + 12 + len(pv)
             vlen = len(version)
@@ -588,7 +601,11 @@
 
         stlen = pack(">I", tlen)
         # accumulate various data to write into a list
-        l = [oid, 'v', stlen, pack(">HI", vlen, len(p)), s]
+        assert len(oid) < 2**16
+        assert vlen < 2**16
+        assert tlen < 2L**32
+        l = [pack(">H6x", len(oid)), 'v', stlen,
+             pack(">HI", vlen, len(p)), s, oid]
         if p:
             l.append(p)
         if version:
@@ -641,11 +658,11 @@
         if version:
             code |= 0x80
         self._tracefile.write(
-            struct_pack(">ii8s8s",
+            struct_pack(">iiH8s",
                         time_time(),
                         (dlen+255) & 0x7fffff00 | code | self._current,
-                        oid,
-                        serial))
+                        len(oid),
+                        serial) + oid)
 
     def read_index(self, serial, fileindex):
         index = self._index
@@ -672,7 +689,8 @@
                 self.rilog("invalid header data", pos, fileindex)
                 break
 
-            oid = h[:8]
+            oidlen = unpack(">H", h[:2])[0]
+            oid = read(oidlen)
 
             if h[8] == 'v' and vlen:
                 seek(dlen+vlen, 1)
@@ -681,7 +699,7 @@
                     self.rilog("truncated record", pos, fileindex)
                     break
                 vdlen = unpack(">i", vdlen)[0]
-                if vlen+dlen+43+vdlen != tlen:
+                if vlen + oidlen + dlen + 43 + vdlen != tlen:
                     self.rilog("inconsistent lengths", pos, fileindex)
                     break
                 seek(vdlen, 1)
@@ -691,7 +709,7 @@
                     break
             else:
                 if h[8] in 'vn' and vlen == 0:
-                    if dlen+31 != tlen:
+                    if oidlen + dlen + 31 != tlen:
                         self.rilog("inconsistent nv lengths", pos, fileindex)
                     seek(dlen, 1)
                     if read(4) != h[9:13]:


=== Zope/lib/python/ZEO/stats.py 1.20 => 1.21 ===
--- Zope/lib/python/ZEO/stats.py:1.20	Fri Jan  3 17:07:38 2003
+++ Zope/lib/python/ZEO/stats.py	Tue Jun 10 13:08:10 2003
@@ -35,8 +35,9 @@
 0       4     timestamp (seconds since 1/1/1970)
 4       3     data size, in 256-byte increments, rounded up
 7       1     code (see below)
-8       8     object id
-16      8     serial number
+8       2     object id length
+10      8     serial number
+18  variable  object id
 
 The code at offset 7 packs three fields:
 
@@ -56,6 +57,7 @@
 import time
 import getopt
 import struct
+from types import StringType
 
 def usage(msg):
     print >>sys.stderr, msg
@@ -155,12 +157,16 @@
                 if not quiet:
                     print "Skipping 8 bytes at offset", offset-8
                 continue
-            r = f_read(16)
-            if len(r) < 16:
+            r = f_read(10)
+            if len(r) < 10:
                 break
-            offset += 16
+            offset += 10
             records += 1
-            oid, serial = struct_unpack(">8s8s", r)
+            oidlen, serial = struct_unpack(">H8s", r)
+            oid = f_read(oidlen)
+            if len(oid) != oidlen:
+                break
+            offset += oidlen
             if t0 is None:
                 t0 = ts
                 thisinterval = t0 / interval
@@ -197,11 +203,11 @@
                     bysizew[dlen] = d = bysizew.get(dlen) or {}
                     d[oid] = d.get(oid, 0) + 1
             if verbose:
-                print "%s %d %02x %016x %016x %1s %s" % (
+                print "%s %d %02x %s %016x %1s %s" % (
                     time.ctime(ts)[4:-5],
                     current,
                     code,
-                    U64(oid),
+                    oid_repr(oid),
                     U64(serial),
                     version,
                     dlen and str(dlen) or "")
@@ -345,6 +351,12 @@
 def U64(s):
     h, v = struct.unpack(">II", s)
     return (long(h) << 32) + v
+
+def oid_repr(oid):
+    if isinstance(oid, StringType) and len(oid) == 8:
+        return '%16x' % U64(oid)
+    else:
+        return repr(oid)
 
 def addcommas(n):
     sign, s = '', str(n)




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