1. 26 Oct, 2021 8 commits
    • Kirill Smelkov's avatar
      wcfs: xbtree: blib += RangedMap, RangedKeySet · b7c560c5
      Kirill Smelkov authored
      RangedMap is Key->VALUE map with adjacent keys mapped to the same value coalesced into Ranges.
      RangedKeySet is set of Keys with adjacent keys coalesced into Ranges.
      
      This data structures will be needed for ΔBtail.
      
      For now the implementation is simple since it keeps whole map in a
      linear slice because both RangedMap and RangedKeySet will be used in
      ΔBtail to keep something proportional to δ of a change, which is assumed
      to be small or medium most of the time.
      
      Some preliminary history:
      
      6ea5920a    X xbtree: Less copy/garbage in RangedKeySet ops
      3ecacd99    X need to keep Value first so that sizeof(set-entry) = sizeof(KeyRange)
      a5b9b19b    X SetRange draftly works
      ed2de0de    X Tests for Get
      3b7b69e6    X fixes for empty set/range
      6972f999    X xbtree/blib: RangedMap, RangedSet += IntersectsRange, Intersection
      b7c560c5
    • Kirill Smelkov's avatar
      wcfs: tests: Tree-based testing environment · 828da0e1
      Kirill Smelkov authored
      Add treeenv.go that combines Treegen and client side access to ZODB with
      committed trees as extension to testing.T . The environment allows to
      easily see which tree update was committed, what is the difference in
      terms of KV, what is the state of updated tree and state of pointed-to
      ZBlk objects.
      
      This will be used to test upcoming ΔBtail and ΔFtail.
      
      Main functionality is in treeenv.go; the other added files are to
      support that.
      
      Some preliminary history:
      
      f07502fc    X xbtreetest: Teach T & Commit to automatically provide At in symbolic form
      0d62b05e    X Adjust to btree.VGet & friends signature change to include keycov in visit callback
      588a512a    X zdata: Switch SliceByFileRev not to clone Zinblk
      e9c4b619    X rebuild: tests: Random testing
      43090ac7    X tests: Factor-out tree-test-env into tTreeEnv
      d4a523b2    X δbtail: tests: Run much faster with live ZODB cache
      271d953d    X rebuild: tests: Move ΔBtail.Clone test out of hot inner loop into separate test
      c32055fc    X wcfs/xbtree: ΔBtail tests += ø -> Tree; Tree -> ø
      5324547c    X wcfs/xbtree: root(a) must stay in trackSet even after treediff(a,ø)
      8f6e2b1e    X rebuild: tests: Don't access ZODB in XGetδKV
      828da0e1
    • Kirill Smelkov's avatar
      wcfs: Set package · 84b89f42
      Kirill Smelkov authored
      Lacking generics we have set.go.in and instantiation for Set[int64],
      set[string], Set[Oid] and Set[Tid] - that will be used in follow-up
      patches.
      
      The set.go.in itself is mostly a generalized copy from git-backup:
      
      https://lab.nexedi.com/kirr/git-backup/blob/c9db60e8/set.go
      84b89f42
    • Kirill Smelkov's avatar
      wcfs: tests: Treegen functionality · 9cb12737
      Kirill Smelkov authored
      treegen.go and treegen.py together provide a way
      
      - to commit a particular BTree topology into ZODB, and
      - to generate set of random tree topologies that all correspond to particular {k->v} dict.
      
      this will be used in upcoming ΔBtail and ΔFtail tests.
      
      See treegen.py documentation for details.
      
      Some preliminary history:
      
      9eca74ec    X Teach AllStructs to emit topologies with values
      1b962f03    X Restructure: found bug that it was not marking objects as modified
      2139af2c    X treegen: Verify that tree actually saved to storage is what was requested
      b5e39d4a    X wcfs/treegen: allstructs: Do not keep all tree structures in memory
      e9c4b619    X rebuild: tests: Random testing
      c32055fc    X wcfs/xbtree: ΔBtail tests += ø -> Tree; Tree -> ø
      4300d88a    X wcfs/xbtreetest/treegen.py: Fix it on ZODB4
      9cb12737
    • Kirill Smelkov's avatar
      wcfs: xbtree: blib: Start of package · 56cb2897
      Kirill Smelkov authored
      This will be the place to keep BTree-related utilities.
      For now it provides only type aliases since Go lacks generics.
      56cb2897
    • Kirill Smelkov's avatar
      wcfs: tests: xbtree.py package for inspecting/manipulating internal structure of BTrees · c58c20d6
      Kirill Smelkov authored
      To handle invalidations, WCFS will need to detect changes to both ZBlk
      objects and to ZBigFile.blktab BTree that is mapping file blocks to ZBlk
      objects. And with BTree detecting changes is much more complex, because
      when a BTree changes, it might be rebalanced, or keys migrated from one
      tree/bucket node to another tree/bucket node. In other words a BTree
      change might be not only a change to a {}key->value dictionary, but also
      a change to BTree topology.
      
      Because there are many BTree topologies that correspond to the same
      {}key->value state, a change from kv₁ to kv₂, even if kv₁ and kv₂ are
      close to each other, might be accompanied by a dramatic change to
      topology of the tree. This creates a need for thoroughly testing the
      BTree difference algorithm because many of BTree topologies changes are
      tricky, and if a simple algorithm works on relatively stable topology
      updates, it does not necessarily mean that that same algorithm will
      continue to work correctly in the general case.
      
      So, as a preparatory step, here comes xbtree.py package, that can be
      used to inspect tree topologies, to create trees with specified topology
      and to manipulate topology of an existing tree. This package will be
      used in tests for upcoming ΔBtail.
      
      For debugging, and also since those tests will involve both Go and
      Python parts, it creates the need to be able to specify and exchange
      topology of a tree via compact string. This package also defines so
      called "topology encoding" to do so.
      
      Some preliminar history:
      
      fb56193f    X fix metric to keep Z <- N order stable over key^
      809304d1    X "B:" indicates ø bucket with k&b, "B" - ø bucket with only keys
      9eca74ec    X Teach AllStructs to emit topologies with values
      1b962f03    X Restructure: found bug that it was not marking objects as modified
      9181c5d9    X Restructure; verify that it marks as changed only modifed nodes
      e9902c4a    X improve `xbtree topoview`
      
      For the reference xbtree.py package documentation is quoted below.
      
      ---- 8< ----
      
      Package xbtree provides utilities for inspecting/manipulating internal
      structure of integer-keyed BTrees.
      
      It will be primarily used to help verify ΔBTail in WCFS.
      
      - `Tree` represents a tree node.
      - `Bucket` represents a bucket node.
      - `StructureOf` returns internal structure of ZODB BTree represented as Tree
        and Bucket nodes.
      - `Restructure` reorganizes ZODB BTree instance according to specified topology
        structure.
      
      - `AllStructs` generates all possible BTree topology structures with given keys.
      
      Topology encoding
      -----------------
      
      Topology encoding provides way to represent structure of a Tree as path-like string.
      
      TopoEncode converts Tree into its topology-encoded representation, while
      TopoDecode decodes topology-encoded string back into Tree.
      
      The following example illustrates topology encoding represented by string
      "T3/T-T/B1-T5/B-B7,8,9":
      
            [ 3 ]             T3/         represents Tree([3])
             / \
           [ ] [ ]            T-T/        represents two empty Tree([])
            ↓   ↓
           |1|[ 5 ]           B1-T5/      represent Bucket([1]) and Tree([5])
               / \
              || |7|8|9|      B-B7,8,9    represents empty Bucket([]) and Bucket([7,8,9])
      
      Topology encoding specification:
      
      A Tree is encoded by level-order traversal, delimiting layers with "/".
      Inside a layer Tree and Bucket nodes are signalled as
      
          "T<keys>"           ; Tree
          "B<keys>"           ; Bucket with only keys
          "B<keys+values>"    ; Bucket with keys and values
      
      Keys are represented as ","-delimited list of integers. For example Tree
      or Bucket with [1,3,5] keys are represented as
      
          "T1,3,5"        ; Tree([1,3,5])
          "B1,3,5"        ; Bucket([1,3,5])
      
      Keys+values are represented as ","-delimited list of "<key>:<value>" pairs. For
      example Bucket corresponding to {1:1, 2:4, 3:9} is represented as
      
          "B1:1,2:4,3:9"  ; Bucket([1,2,3], [1,4,9])
      
      Empty keys+values are represented as ":" - an empty Bucket for key->value
      mapping is represented as
      
          "B:"            ; Bucket([], [])
      
      Nodes inside one layer are delimited with "-". For example a layer consisting
      of an empty Tree, a Tree with [1,3] keys, and Bucket with [4,5] keys is
      represented as
      
          "T-T1,3-B4,5"   ; layer with Tree([]), Tree([1,3]) and Bucket([4,5])
      
      A layer consists of nodes that are followed by node-node links from upper layer
      in left-to-right order.
      
      Visualization
      -------------
      
      The following visualization utilities are provided to help understand BTrees
      better:
      
      - `topoview` displays BTree structure given its topology-encoded representation.
      - `Tree.graphviz` returns Tree graph representation in dot language.
      c58c20d6
    • Kirill Smelkov's avatar
      wcfs: tests: Start verifying state of OS file cache · fbf15309
      Kirill Smelkov authored
      For WCFS to be efficient it will have to carefully preserve OS cache on
      file invalidations. As preparatory step establish infrastructure for
      verifying state of OS file cache and start asserting on OS cache state
      in a couple of places.
      
      See comments added to tFile constructor that describe how OS cache state
      verification is setup.
      
      Some preliminary history:
      
      8293025b    X Thoughts on how to avoid readahead touching pages of neighbour block
      3054e4a3    X not touching neighbour block works via setting MADV_RANDOM in last 1/4 of every block
      18362227    X #5 access still triggers read to #4 ?
      17dbf94e    X Provide mlock2 fallback for Ubuntu
      d134c0b9    X wcfs: test: try to live with only hard memlock limit adjusted
      c2423296    X Fix mlock2 build on Debian 8
      fbf15309
    • Kirill Smelkov's avatar
      wcfs: Initial implementation of basic filesystem · 58e2a88c
      Kirill Smelkov authored
      Provide filesystem view of in-ZODB ZBigFiles, but do not implement support for
      invalidations nor isolation protocol yet. In particular, because ZODB
      invalidations are not yet handled, the filesystem does not update its data in
      accordance with ZODB updates, and instead provides stale data view that
      corresponds to the state of ZODB at the time when wcfs was mounted.
      
      The main parts of this patch are:
      
      - wcfs/wcfs.go is filesystem implementation itself together with overview.
      - wcfs/__init__.py is python wrapper to spawn and interoperate with that filesystem.
      - wcfs/wcfs_test.py is tests.
      
      Some preliminary history:
      
      fe7efb94    X start of wcfs
      878b2787    X draft loading
      d58c71e8    X don't overalign end by 1 blksize if end is already aligned
      29c9f13d    X readBlk: Fix thinko in already case
      59552328    X wcfs: Care to disable OS polling on us
      c00d94c7    X workaround lack of exception chaining on Python2 with xdefer
      0398e23d    X bytearray turned out to be copying data
      7a837040    X print wcfs.py py-level traceback on SIGBUS (e.g. wcfs.go aborting due to bug/panic)
      661b871f    X make sure tests don't get stuck even if wcfs gets killed -9 ...
      2c043d29    X More effort to unmount failed wcfs.go
      1ccc4478    X Use `with gil` + regular py code instead of PyGILState_Ensure/PyGILState_Release/PyRun_SimpleString
      5dc9c791    X wcfs: Kill xdefer
      91e9eba8    X wcfs: test: Register tFile to tDB early
      a7138fef    X wcfs: mkdir /tmp/wcfs with sticky bit
      1eec76d0    X wcfs: try to set sticky for /tmp/wcfs even if the directory already exists
      c2c35851    X wcfs: tests: Factor-out waiting for a general condition to become true into waitfor
      78f36993    X wcfs: test: Fix thinko in getting /sys/fs/fuse/connection/<X> for wcfs
      bc9eb16f    X wcfs: tests: Don't use testmntpt everywhere
      6dec74e7    X wcfs: tests: Split tDB into -> tDB + tWCFS
      3a6bd764    X wcfs: tests: Run `fusermount -u` the second time if we had to kill wcfs
      112720f3    X wcfs: tests: Print which files are still opened on wcfs if `fusermount -u` fails
      bb40185b    X wcfs: Take $WENDELIN_CORE_WCFS_OPTIONS into account not only from under join
      03a9ef33    X wcfs: Remove credentials from zurl when computing wcfs mountpoint
      68ee5bdc    X wcfs: lsof tweaks
      21671879    X wcfs: Teach entrypoint frontend to handle subcommands: serve, status, stop
      b0642b80    X wcfs: Switch mountpoints from /tmp/wcfs/* to /dev/shm/*
      b0ca031f    X wcfs: Teach join/serve to start successfully even after unclean wcfs shutdown
      5bfa8cf8    X wcfs: Add start to spawn a Server that can be later stopped  (draft)
      5fcec261    X wcfs: Run fusermount and friends with /bin:/usr/bin always on path
      669d7a20    fixup! X wcfs: Run fusermount and friends with /bin:/usr/bin always on path
      6b22f8c4    X wcfs: Teach start to start successfully even after unclean wcfs shutdown
      15389db0    X wcfs: Tune _fuse_unmount to include `fusermount -u` error message into raised exception
      153c002a    X wcfs: _fuse_unmount: Try first `kill -TERM` before `kill -QUIT` wcfs
      3244f3a6    X wcfs: lsof +D misbehaves - don't use it
      a126e709    X wcfs: Put client log into its own logger
      ac303d1e    X wcfs: tests: -v  ->  show only wcfs.py logs verbosely
      d671a9e9    X wcfs: Give more time to stop wcfs server
      58e2a88c
  2. 25 Oct, 2021 10 commits
  3. 01 Apr, 2021 3 commits
    • Kirill Smelkov's avatar
      tests: Reset transaction synchronizers before every test run · fe369d32
      Kirill Smelkov authored
      Else, e.g. after a failing test, that closed its storage and DB, but not
      all Connections, another test, just by starting new transaction, would
      invoke synchronization on that unclosed connection, which will try to
      access closed storage and likely fail.
      
      Fixes e.g. https://nexedijs.erp5.net/#/test_result_module/20210401-31B27B3D/5
      
      Crash scenariou is the same as described in 5a5ed2c7 (tests: Force-close
      ZODB connections in teardown, that testing code forgot to explicitly
      close). Only now we try to isolate tests from each other not only for
      different modules, but also for tests inside the same module.
      fe369d32
    • Kirill Smelkov's avatar
      lib/zodb: Add tests for critical ZODB properties that Wendelin.core 2 will depend on · c37a989d
      Kirill Smelkov authored
      The tests verify that there is no concurrency bugs around load,
      Connection.open and invalidations. See e.g.
      
      https://github.com/zopefoundation/ZODB/issues/290
      https://github.com/zopefoundation/ZEO/issues/155
      
      By including the tests into wendelin.core, we will have CI coverage for
      all supported storages (FileStorage, ZEO, NEO), and for all supported
      ZODB (currently ZODB4, ZODB4-wc2 and ZODB5).
      
      ZEO5 is know to currently fail zloadrace.
      However, even though ZODB#290 was fixed, ZEO5 turned out to also fail on zopenrace:
      
              def test_zodb_zopenrace():
                  # exercises ZODB.Connection + particular storage implementation
          >       zopenrace.main()
      
          lib/tests/test_zodb.py:382:
          _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
          <decorator-gen-1>:2: in main
              ???
          ../../tools/go/pygolang/golang/__init__.py:103: in _
              return f(*argv, **kw)
          lib/tests/testprog/zopenrace.py:115: in main
              test(zstor)
          <decorator-gen-2>:2: in test
              ???
          ../../tools/go/pygolang/golang/__init__.py:103: in _
              return f(*argv, **kw)
          lib/tests/testprog/zopenrace.py:201: in test
              wg.wait()
          golang/_sync.pyx:246: in golang._sync.PyWorkGroup.wait
              ???
          golang/_sync.pyx:226: in golang._sync.PyWorkGroup.go.pyrunf
              ???
          lib/tests/testprog/zopenrace.py:165: in T1
              t1()
          _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
      
              def t1():
                  transaction.begin()
                  zconn = db.open()
      
                  root = zconn.root()
                  obj1 = root['obj1']
                  obj2 = root['obj2']
      
                  # obj1 - reload it from zstor
                  # obj2 - get it from zconn cache
                  obj1._p_invalidate()
      
                  # both objects must have the same values
                  i1 = obj1.i
                  i2 = obj2.i
                  if i1 != i2:
          >           raise AssertionError("T1: obj1.i (%d)  !=  obj2.i (%d)" % (i1, i2))
          E           AssertionError: T1: obj1.i (3)  !=  obj2.i (2)
      
          lib/tests/testprog/zopenrace.py:156: AssertionError
      c37a989d
    • Kirill Smelkov's avatar
      *: tests: don't hang on exception in non-main thread · 08e0c9fb
      Kirill Smelkov authored
      Previously if an assert or something failed in spawned thread, the main
      thread was usually spinning indefinitely = tests hang. -> Switch all
      threading places to use sync.WorkGroup and this way if a thread fails,
      all other threads are canceled and the exception is reported back to
      wg.wait in main thread.
      
      Since we start to go this route, NotifyChannel is reworked to fully use
      channels instead of busy-waiting.
      08e0c9fb
  4. 26 Mar, 2021 1 commit
  5. 08 Mar, 2021 3 commits
    • Kirill Smelkov's avatar
      tox: v↑ NEO (1.9 -> 1.12) · 95b012d3
      Kirill Smelkov authored
      NEO 1.9 was released in 2018 and is outdated by now. NEO 1.12 is
      currently the latest NEO release.
      95b012d3
    • Kirill Smelkov's avatar
      Require Zodbtools · d62a297c
      Kirill Smelkov authored
      After switching to ZODB >= 4 in the previous commit, we can safely
      require zodbtools, because there is now no conflict in between
      ZODB3/ZODB eggs.
      d62a297c
    • Kirill Smelkov's avatar
      Drop support for ZODB3 · 0802da2b
      Kirill Smelkov authored
      It's been a while since last ZODB3 3.10.7 release in 2016 and the last
      commit in upstream ZODB3 repository (3.10 branch) is from 2017. The
      world switched since then to ZODB4 and to ZODB5 after that.
      
      We were still requiring ZODB3, because ZODB3 3.11 egg was just a
      dependency on newer ZODB, ZEO, BTrees and persistent; and this way we
      could be supporting all ZODB3.10.x and  ZODB4 and ZODB5 via ZODB3.11.
      
      However upcoming Wendelin.core 2, for its proper working, needs MVCC
      semantic as implemented in ZODB5. This forces us, even for ZODB4, to
      backport non-trivial bits from ZODB5 (see [1]). Maintaining ZODB3
      support at this point becomes non-practical, because, to our knowledge,
      there is no wendelin.core user that plans to continue using ZODB3
      without switching to at least ZODB4 in the near future.
      
      So goodbye ZODB3. Even though ZODB still stays with us, it gives a
      feeling similar to [2], because in 2014, when I was myself learning
      ZODB, it was through ZODB3 - still at the time when all ZODB bits were
      living together in one place.
      
      [1] nexedi/ZODB!1
      [2] https://lists.osuosl.org/pipermail/darcs-users/2008-September/014095.html
      0802da2b
  6. 11 Dec, 2020 1 commit
    • Kirill Smelkov's avatar
      tests: Don't try to access db.storage when automatically closing connections · fd6b5252
      Kirill Smelkov authored
      DB.close() does `del self.storage`.
      
      https://github.com/zopefoundation/ZODB/blob/5.6.0-14-g0eae10cd0/src/ZODB/DB.py#L646
      
      This way if DB was closed, but some conn(s) were not, it will crash in
      teardown as e.g. below:
      
          _____________ ERROR at teardown of test_bigfile_zblk1_zdata_reuse ______________
      
              def teardown_module():
          >       testdb.teardown()
      
          bigfile/tests/test_filezodb.py:58:
          _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
      
          self = <wendelin.lib.testing.TestDB_ZEO object at 0x7fb9c0216350>
      
              def teardown(self):
                  # close connections that test code forgot to close
                  for connref, tb in self.connv:
                      conn = connref()
                      if conn is None:
                          continue
                      if not conn.opened:
                          continue    # still alive, but closed
                      print("W: testdb: teardown: %s left not closed by test code"
                            "; opened by:\n%s" % (conn, tb), file=sys.stderr)
      
                      db = conn.db()
          >           stor = db.storage
          E           AttributeError: 'DB' object has no attribute 'storage'
      
          lib/testing.py:217: AttributeError
      
      The fix is simple - don't use db.storage at all, because it is not actually used in that code.
      fd6b5252
  7. 17 Nov, 2020 2 commits
  8. 03 Nov, 2020 2 commits
    • Kirill Smelkov's avatar
      t/tfault-run: Require bash · a702d410
      Kirill Smelkov authored
      Otherwise when /bin/sh is dash it fails with
      
          t/tfault-run: 35: test: on_pagefault: unexpected operator
      a702d410
    • Kirill Smelkov's avatar
      t/tfault-run: Clear state from previous run before starting · cf92dfca
      Kirill Smelkov authored
      Otherwise, if previous test.fault failed, tfault-run fails to start, e.g.
      
          >>> test.fault
          $ make test.fault # MAKEFLAGS=-j1
          x86_64-linux-gnu-gcc -pthread -g -Wall -D_GNU_SOURCE -std=gnu99 -fplan9-extensions -Wno-declaration-after-statement -Wno-error=declaration-after-statement  -Iinclude -I3rdparty/ccan -I3rdparty/include   bigfile/tests/tfault.c lib/bug.c lib/utils.c 3rdparty/ccan/ccan/tap/tap.c  -o bigfile/tests/tfault.t
          t/tfault-run bigfile/tests/tfault.t faultr on_pagefault
          mkdir: cannot create directory ‘t/tfault-run.faultr’: File exists
          Makefile:186: recipe for target 'faultr.tfault' failed
          make: *** [faultr.tfault] Error 1
          rm bigfile/tests/tfault.t
          error   test.fault      0.433s  # 1t 1e 0f 0s
      cf92dfca
  9. 02 Nov, 2020 1 commit
  10. 11 Sep, 2020 1 commit
  11. 17 May, 2020 2 commits
  12. 17 Apr, 2020 1 commit
  13. 15 Apr, 2020 5 commits
    • Kirill Smelkov's avatar
      setup: Fix hooking of git_lsfiles in PEP517 mode · bd1fb19e
      Kirill Smelkov authored
      In PEP517 mode setup.py is sourced - not executed - and the build fails
      with ImportError like this:
      
          Preparing wheel metadata ... error
          ERROR: Command errored out with exit status 1:
           command: /home/kirr/src/wendelin/venv/z-dev/bin/python2 /home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py prepare_metadata_for_build_wheel /tmp/tmp2F3aEs
               cwd: /home/kirr/src/wendelin/wendelin.core
          Complete output (53 lines):
          running dist_info
          creating /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info
          writing requirements to /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/requires.txt
          writing /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/PKG-INFO
          writing top-level names to /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/top_level.txt
          writing dependency_links to /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/dependency_links.txt
          writing entry points to /tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/entry_points.txt
          writing manifest file '/tmp/pip-modern-metadata-sPiqUt/wendelin.core.egg-info/SOURCES.txt'
          package init file '__init__.py' not found (or not a regular file)
          Traceback (most recent call last):
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 257, in <module>
              main()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 240, in main
              json_out['return_val'] = hook(**hook_input['kwargs'])
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 110, in prepare_metadata_for_build_wheel
              return hook(metadata_directory, config_settings)
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/build_meta.py", line 155, in prepare_metadata_for_build_wheel
              self.run_setup()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/build_meta.py", line 234, in run_setup
              self).run_setup(setup_script=setup_script)
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/build_meta.py", line 141, in run_setup
              exec(compile(code, __file__, 'exec'), locals())
            File "setup.py", line 374, in <module>
              """.splitlines()]
            File "/home/kirr/src/tools/go/pygolang/golang/pyx/build.py", line 118, in setup
              setuptools_dso.setup(**kw)
            File "/home/kirr/src/tools/py/pypa/setuptools_dso/src/setuptools_dso/__init__.py", line 37, in setup
              _setup(**kws)
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/__init__.py", line 145, in setup
              return distutils.core.setup(**attrs)
            File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
              dist.run_commands()
            File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
              self.run_command(cmd)
            File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
              cmd_obj.run()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/dist_info.py", line 31, in run
              egg_info.run()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 296, in run
              self.find_sources()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 303, in find_sources
              mm.run()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 534, in run
              self.add_defaults()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 574, in add_defaults
              rcfiles = list(walk_revctrl())
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/setuptools/command/sdist.py", line 20, in walk_revctrl
              for item in ep.load()(dirname):
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2434, in load
              return self.resolve()
            File "/home/kirr/src/wendelin/venv/z-dev/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2444, in resolve
              raise ImportError(str(exc))
          ImportError: 'module' object has no attribute 'git_lsfiles'
      
      See comments added to register_as_entrypoint for explanation of what
      happens.
      
      Wendelin.core will soon switch to PEP517 mode (by adding pyproject.toml)
      to build-require Cython, Pygolang and friends.
      bd1fb19e
    • Kirill Smelkov's avatar
      lib/zodb: Add zstor_2zurl - way to convert a ZODB storage into URL to access it · 6637d216
      Kirill Smelkov authored
      Wendelin.core 2 will need to spawn WCFS filesystem server that accesses
      the same ZODB database as the program that spawns it. The database
      argument passed to WCFS is passed in the form of URL[1,2].  Even though
      zodburi provides way to convert an URL into ZODB storage instance, there
      is currently no way for reverse operation - to convert ZODB storage
      instance into URL to access it(*). So we have to build it by our own.
      
      Provide zstor_2zurl stub that currently works for FileStorage only.
      ZEO and NEO support is TODO.
      
      In the future we might want to move this functionality into
      zodbtools/py.
      
      [1] https://lab.nexedi.com/nexedi/zodbtools/blob/a2e4dd23/zodbtools/help.py#L27-53
      [2] https://lab.nexedi.com/kirr/neo/blob/3d909114/go/zodb/zodbtools/help.go#L25-51
      
      (*) contrary to ZODB/go where this functionality is provided out of the box:
          https://godoc.org/lab.nexedi.com/kirr/neo/go/zodb#IStorage
      6637d216
    • Kirill Smelkov's avatar
      lib/zodb: Add patch to ZODB.Connection to support callback on connection DB view change · 959ae2d0
      Kirill Smelkov authored
      Wendelin.core 2 will need to hook into when client ZODB.Connection
      changes its database view and readjust WCFS-level client connection
      accordingly.
      
      ZODB.Connection can change its view on either connection reopen, or even
      without reopen on start of new transaction.
      
      This patch implements ZODB.Connection.onResyncCallback for ZODB5 only.
      
      ZODB4 and ZODB3 support is TODO.
      959ae2d0
    • Kirill Smelkov's avatar
      lib/zodb: Add zconn_at draft (ZODB5 only) · 3bd82127
      Kirill Smelkov authored
      For wendelin.core v2 we need a way to know at which particular database
      state application-level ZODB connection is viewing the database. Knowing
      that state, WCFS client library will interact with WCFS filesystem server
      and, in simple terms, request the server to provide data as of that
      particular database state.
      
      Contrary to ZODB/go[1] ZODB/py does not provide the functionality to
      obtain DB state of connection view, so we have to build it ourselves.
      Let us call the function that for a client ZODB connection returns
      database state corresponding to its database view as zconn_at.
      
      It is relatively easy to implement zconn_at for ZODB5, since ZODB5
      adopted MVCC uniformly and this patch does just that. However even with
      ZODB5 currently all released ZODB5 versions have race in
      Connection.open() vs invalidations[2], and so the first ZODB5 release
      with which zconn_at implemented here will work reliable should be
      upcoming ZODB 5.5.2
      
      It is TODO to implement zconn_at for ZODB4 and ZODB3, which organize
      things differently.
      
      Please note what would happen if zconn_at gives, even a bit, incorrect
      answer: wcfs client will ask wcfs server to provide array data as of
      different database state compared to current on-client ZODB connection.
      This will result in that data accessed via ZBigArray will _not_
      correspond to all other data accessed via regular ZODB mechanism.
      It is, in other words, would be a data corruptions.
      
      [1] https://godoc.org/lab.nexedi.com/kirr/neo/go/zodb#Connection
      [2] https://github.com/zopefoundation/ZODB/issues/290
      3bd82127
    • Kirill Smelkov's avatar
      lib/zodb: Add zmajor - way to know under which ZODB 3, 4 or 5 we are running · 8c0b7471
      Kirill Smelkov authored
      This will be needed in the following patches to know how to inject
      zconn_at or zconn resync functionality into particular ZODB version.
      8c0b7471