- Renamed xhtml Title from "Allmydata - Tahoe" to "Tahoe-LAFS"
- Renamed Tahoe to Tahoe-LAFS in page content
- Changed Tahoe-LAFS home page link to http://tahoe-lafs.org (added target="blank")
- Deleted commented css script in info.xhtml
- Make some important utility functions clearer and more thoroughly
documented.
- Assert in upload.servers_of_happiness that the buckets attributes
of PeerTrackers passed to it are mutually disjoint.
- Get rid of some silly non-Pythonisms that I didn't see when I first
wrote these patches.
- Make sure that should_add_server returns true when queried about a
shnum that it doesn't know about yet.
- Change Tahoe2PeerSelector.preexisting_shares to map a shareid to a set
of peerids, alter dependencies to deal with that.
- Remove upload.should_add_servers, because it is no longer necessary
- Move upload.shares_of_happiness and upload.shares_by_server to a utility
file.
- Change some points in Tahoe2PeerSelector.
- Compute servers_of_happiness using a bipartite matching algorithm that
we know is optimal instead of an ad-hoc greedy algorithm that isn't.
- Change servers_of_happiness to just take a sharemap as an argument,
change its callers to merge existing_shares and used_peers before
calling it.
- Change an error message in the encoder to be more appropriate for
servers of happiness.
- Clarify the wording of an error message in immutable/upload.py
- Refactor a happiness failure message to happinessutil.py, and make
immutable/upload.py and immutable/encode.py use it.
- Move the word "only" as far to the right as possible in failure
messages.
- Use a better definition of progress during peer selection.
- Do read-only peer share detection queries in parallel, not sequentially.
- Clean up logging semantics; print the query statistics whenever an
upload is unsuccessful, not just in one case.
When I first implemented #778, I just altered the error messages to refer to
servers where they referred to shares. The resulting error messages weren't
very good. These are a bit better.
The Tahoe2PeerSelector returned either NoSharesError or NotEnoughSharesError
for a variety of error conditions that weren't informatively described by them.
This patch creates a new error, UploadHappinessError, replaces uses of
NoSharesError and NotEnoughSharesError with it, and alters the error message
raised with the errors to be more in line with the new servers_of_happiness
behavior. See ticket #834 for more information.
- Fix comments and confusing naming.
- Add tests for the new error messages suggested by David-Sarah
and Zooko.
- Alter existing tests for new error messages.
- Make sure that the tests continue to work with the trunk.
- Add a test for a mutual disjointedness assertion that I added to
upload.servers_of_happiness.
- Fix the comments to correctly reflect read-onlyness
- Add a test for an edge case in should_add_server
- Add an assertion to make sure that share redistribution works as it
should
- Alter tests to work with revised servers_of_happiness semantics
- Remove tests for should_add_server, since that function no longer exists.
- Alter tests to know about merge_peers, and to use it before calling
servers_of_happiness.
- Add tests for merge_peers.
- Add Zooko's puzzles to the tests.
- Edit encoding tests to expect the new kind of failure message.
- Edit tests to expect error messages with the word "only" moved as far
to the right as possible.
- Extended and cleaned up some helper functions.
- Changed some tests to call more appropriate helper functions.
- Added a test for the failing redistribution algorithm
- Added a test for the progress message
- Added a test for the upper bound on readonly peer share discovery.
This patch modifies the regular expression used for verifying of '--node-url'
parameter. Support for accessing a Tahoe gateway over HTTPS was already
present, thanks to Python's urllib.
This handles the case where we upload a new tahoe directory for a
previously-processed local directory, possibly creating a new dircap (if the
metadata had changed). Now we replace the old dirhash->dircap record. The
previous behavior left the old record in place (with the old dircap and
timestamps), so we'd never stop creating new directories and never converge
on a null backup.
These edits were suggested by my watching over Jake Appelbaum's shoulder as he completely ignored/skipped/missed install.html and also as he decided that debian.txt wouldn't help him with basic installation. Then I threw in a few docs edits that have been sitting around in my sandbox asking to be committed for months.
To test the changes for #577, we need a deterministic way to simulate
the passage of long periods of time. twisted.internet.task.Clock seems,
from my Googling, to be the way to go for this functionality. I changed
a few things so that OphandleTable would use twisted.internet.task.Clock
when testing:
* WebishServer.__init___ now takes an optional 'clock' parameter,
* which it passes to the root.Root instance it creates.
* root.Root.__init__ now takes an optional 'clock' parameter, which it
passes to the OphandleTable.__init__ method.
* OphandleTable.__init__ now takes an optional 'clock' parameter. If
it is provided, and it isn't None, its callLater method will be used
to schedule ophandle expirations (as opposed to using
reactor.callLater, which is what OphandleTable does normally).
* The WebMixin object in test_web.py now sets a self.clock parameter,
which is a twisted.internet.task.Clock that it feeds to the
WebishServer it creates.
Tests using the WebMixin can control the passage of time in
OphandleTable by accessing self.clock.
It still lacks the right HTML report (the builtin report is very pretty, but
lacks the "lines uncovered" numbers that I want), and the half-finished
delta-from-last-run measurements.
This can be useful if one of the ones that he has already begun downloading fails. See #287 for discussion. This fixes part of #287 which part was a regression caused by #928, namely this fixes fail-over in case a share is corrupted (or the server returns an error or disconnects). This does not fix the related issue mentioned in #287 if a server hangs and doesn't reply to requests for blocks.
This should put an end to the phenomenon I've been seeing that a single hung server can cause all downloads on a grid to hang. Also it should speed up all downloads by (a) not-waiting for responses to queries that it doesn't need, and (b) downloading shares from the servers which answered the initial query the fastest.
Also, do not count how many buckets you've gotten when deciding whether the download has enough shares or not -- instead count how many buckets to *unique* shares that you've gotten. This appears to improve a slightly weird behavior in the current download code in which receiving >= K different buckets all to the same sharenumber would make it think it had enough to download the file when in fact it hadn't.
This patch needs tests before it is actually ready for trunk.
Having both test_node() and test_client() (one of which calls the other) felt
confusing to me, so I changed it to have test_node(), test_client(), and a
common do_create() helper method.
This patch displays a warning to the user in two cases:
1. When special files like symlinks, fifos, devices, etc. are found in the
local source.
2. If files or directories are not readables by the user running the 'tahoe
backup' command.
In verbose mode, the number of skipped files and directories is printed at the
end of the backup.
Exit status returned by 'tahoe backup':
- 0 everything went fine
- 1 the backup failed
- 2 files were skipped during the backup
allmydata.util.log.err() either takes a Failure as the first positional
argument, or takes no positional arguments and must be invoked in an
exception handler. Fixed its signature to match both foolscap.logging.log.err
and twisted.python.log.err . Included a brief unit test.
Stop checking separately for ConnectionDone/ConnectionLost, since those have
been folded into DeadReferenceError since foolscap-0.3.1 . Write
rrefutil.trap_deadref() in terms of rrefutil.trap_and_discard() to improve
code coverage.
Verifier misses
The results (described in #819) match our expectations: it misses corruption
in unused share fields and in most container fields (which are only visible
to the storage server, not the client). 1265 bytes of a 2753 byte
share (hosting a 56-byte file with an artifically small segment size) are
unused, mostly in the unused tail of the overallocated UEB space (765 bytes),
and the allocated-but-unwritten plaintext_hash_tree (480 bytes).
The bug was that a disconnected server could cause us to re-enter the initial
loop() call, sending multiple queries to a single server, provoking an
incorrect UCWE. To fix it, stall the loop() with an eventual.fireEventually()
instead of weird errors. Closes#874 and #786.
Previously, if the file had 0 shares, this would raise TypeError as it tried
to call download_version(None). If the file had some shares but fewer than
'k', it would incorrectly raise MustForceRepairError.
Added get_successful() to the IRepairResults API, to give repair() a place to
report non-code-bug problems like this.
Mutable servermap updates and the immutable checker, when run with
add_lease=True, send both the do-you-have-block and add-lease commands in
parallel, to avoid an extra round trip time. Many older servers have problems
with add-lease and raise various exceptions, which don't generally matter.
The client-side code was catching+ignoring some of them, but unrecognized
exceptions were passed through to the DYHB code, concealing the DYHB results
from the checker, making it think the server had no shares.
The fix is to separate the code paths. Both commands are sent at the same
time, but the errback path from add-lease is handled separately. Known
exceptions are ignored, the others (both unknown-remote and all-local) are
logged (log.WEIRD, which will trigger an Incident), but neither will affect
the DYHB results.
The add-lease message is sent first, and we know that the server handles them
synchronously. So when the checker is done, we can be sure that all the
add-lease messages have been retired. This makes life easier for unit tests.
web/filenode.py: also serve edge metadata when using t=json on a
DIRCAP/childname object.
tahoe_ls.py: list file objects as if we were listing one-entry directories.
Show edge metadata if we have it, which will be true when doing
'tahoe ls DIRCAP/filename' and false when doing 'tahoe ls
FILECAP'
This forbids operations that would implicitly create a directory with a
zero-length (empty string) name, like what you'd get if you did "tahoe put
local /oops/blah" (#358) or "POST /uri/CAP//?t=mkdir" (#676). The error
message is fairly friendly too.
Also added code to "tahoe put" to catch this error beforehand and suggest the
correct syntax (i.e. without the leading slash).
The webapi has been looking for an Accept header since 1.4.0, but it treats a
missing header as equal to */* (to honor RFC2616). This change finally
modifies our CLI tools to ask for "text/plain, application/octet-stream",
which seems roughly correct (we either want a plain-text traceback or error
message, or an uninterpreted chunk of binary data to save to disk). Some day
we'll figure out how JSON fits into this scheme.
under normal conditions, this wouldn't cause any problems, but if the shares
are really sparse (perhaps because new servers were added), then
file-modifies might stop looking too early and leave old shares in place
* remove Downloader.download_to_data/download_to_filename/download_to_filehandle
* remove download.Data/FileName/FileHandle targets
* remove filenode.download/download_to_data/download_to_filename methods
* leave Downloader.download (the whole Downloader will go away eventually)
* add util.consumer.MemoryConsumer/download_to_data, for convenience
(this is mostly used by unit tests, but it gets used by enough non-test
code to warrant putting it in allmydata.util)
* update tests
* removes about 180 lines of code. Yay negative code days!
Overall plan is to rewrite immutable/download.py and leave filenode.read() as
the sole read-side API.
* backups now share dirnodes with any previous backup, in any location,
so renames and moves are handled very efficiently
* "tahoe backup" no longer bothers reading the previous snapshot
* if you switch grids, you should delete ~/.tahoe/private/backupdb.sqlite,
to force new uploads of all files and directories
