Commit Graph

524 Commits

Author SHA1 Message Date
Vishal Nayak 4484de3ea6
Fix raft config response (#6975) 2019-06-27 17:39:52 -04:00
Brian Kassouf 62e14c280d
storage/raft: fix races in tests (#6996)
* storage/raft: fix races in tests

* Fix another test race
2019-06-27 10:00:03 -07:00
Brian Kassouf 5d0c68ca74
Fix 32-bit builds (#6948) 2019-06-21 09:52:02 -06:00
Vishal Nayak 53035ce390
Raft CLI (#6893)
* raft cli

* Reuse the command's client

* Better response handling

* minor touchups
2019-06-20 21:32:00 -04:00
Jeff Mitchell 07dcdc8b79 Sync 2019-06-20 20:55:10 -04:00
Brian Kassouf ed14061578
Raft Storage Backend (#6888)
* Work on raft backend

* Add logstore locally

* Add encryptor and unsealable interfaces

* Add clustering support to raft

* Remove client and handler

* Bootstrap raft on init

* Cleanup raft logic a bit

* More raft work

* Work on TLS config

* More work on bootstrapping

* Fix build

* More work on bootstrapping

* More bootstrapping work

* fix build

* Remove consul dep

* Fix build

* merged oss/master into raft-storage

* Work on bootstrapping

* Get bootstrapping to work

* Clean up FMS and node-id

* Update local node ID logic

* Cleanup node-id change

* Work on snapshotting

* Raft: Add remove peer API (#906)

* Add remove peer API

* Add some comments

* Fix existing snapshotting (#909)

* Raft get peers API (#912)

* Read raft configuration

* address review feedback

* Use the Leadership Transfer API to step-down the active node (#918)

* Raft join and unseal using Shamir keys (#917)

* Raft join using shamir

* Store AEAD instead of master key

* Split the raft join process to answer the challenge after a successful unseal

* get the follower to standby state

* Make unseal work

* minor changes

* Some input checks

* reuse the shamir seal access instead of new default seal access

* refactor joinRaftSendAnswer function

* Synchronously send answer in auto-unseal case

* Address review feedback

* Raft snapshots (#910)

* Fix existing snapshotting

* implement the noop snapshotting

* Add comments and switch log libraries

* add some snapshot tests

* add snapshot test file

* add TODO

* More work on raft snapshotting

* progress on the ConfigStore strategy

* Don't use two buckets

* Update the snapshot store logic to hide the file logic

* Add more backend tests

* Cleanup code a bit

* [WIP] Raft recovery (#938)

* Add recovery functionality

* remove fmt.Printfs

* Fix a few fsm bugs

* Add max size value for raft backend (#942)

* Add max size value for raft backend

* Include physical.ErrValueTooLarge in the message

* Raft snapshot Take/Restore API  (#926)

* Inital work on raft snapshot APIs

* Always redirect snapshot install/download requests

* More work on the snapshot APIs

* Cleanup code a bit

* On restore handle special cases

* Use the seal to encrypt the sha sum file

* Add sealer mechanism and fix some bugs

* Call restore while state lock is held

* Send restore cb trigger through raft log

* Make error messages nicer

* Add test helpers

* Add snapshot test

* Add shamir unseal test

* Add more raft snapshot API tests

* Fix locking

* Change working to initalize

* Add underlying raw object to test cluster core

* Move leaderUUID to core

* Add raft TLS rotation logic (#950)

* Add TLS rotation logic

* Cleanup logic a bit

* Add/Remove from follower state on add/remove peer

* add comments

* Update more comments

* Update request_forwarding_service.proto

* Make sure we populate all nodes in the followerstate obj

* Update times

* Apply review feedback

* Add more raft config setting (#947)

* Add performance config setting

* Add more config options and fix tests

* Test Raft Recovery (#944)

* Test raft recovery

* Leave out a node during recovery

* remove unused struct

* Update physical/raft/snapshot_test.go

* Update physical/raft/snapshot_test.go

* fix vendoring

* Switch to new raft interface

* Remove unused files

* Switch a gogo -> proto instance

* Remove unneeded vault dep in go.sum

* Update helper/testhelpers/testhelpers.go

Co-Authored-By: Calvin Leung Huang <cleung2010@gmail.com>

* Update vault/cluster/cluster.go

* track active key within the keyring itself (#6915)

* track active key within the keyring itself

* lookup and store using the active key ID

* update docstring

* minor refactor

* Small text fixes (#6912)

* Update physical/raft/raft.go

Co-Authored-By: Calvin Leung Huang <cleung2010@gmail.com>

* review feedback

* Move raft logical system into separate file

* Update help text a bit

* Enforce cluster addr is set and use it for raft bootstrapping

* Fix tests

* fix http test panic

* Pull in latest raft-snapshot library

* Add comment
2019-06-20 12:14:58 -07:00
ncabatoff 2cf5009ff5
Fix deadlock in TestPostgreSQLBackend (#6884)
Make lock2's retryInterval smaller so it grabs the lock as soon as lock1's renewer fails to renew in time.  Fix the logic to test if lock1's leader channel gets closed: we don't need a goroutine, and
the logic was broken in that if we timed out we'd never write to the blocking channel we then try to read from.  Moreover the timeout was wrong.
2019-06-14 12:59:24 -04:00
Mark Gritter d4d1ae55a0
Be more permissive in what URLs to allow; added test for unix socket. (#6859) 2019-06-10 13:59:13 -05:00
Justin Weissig ef17e7cbaa Update comment spelling in postgresql.go (#6817)
Fixed minor comment: PostgresSQL/PostgreSQL
2019-06-04 02:29:36 -05:00
Jim Kalafut 8a0d423ed8
Fix gofmt (#6764) 2019-05-20 15:15:05 -07:00
ncabatoff 64adec23cd
Since the two branches of the UNION produce disjoint sets, do a UNION ALL (#6546)
This obviates the need for a sort/eliminate duplicates step, giving a performance boost in some key distributions with large datasets.
2019-05-10 13:26:01 -04:00
bjorndolk e8f10814b6 Added HA backend for postgres based on dynamodb model (#5731)
Add optional HA support for postgres backend if Postgres version >= 9.5.
2019-05-10 12:48:42 -04:00
Mark Gritter 5d4fc08fc4
Determine scheme from configured address. (#6689)
* Determine scheme from configured address.

* Added test; use parsed version of address for TLS config.
2019-05-08 11:48:31 -05:00
Scott Stevenson f145baa581 Set chunkSize when creating a new GCS backend (#6655)
Adds a small step to TestBackend to prevent regression.
2019-05-03 13:08:29 -07:00
Jeff Mitchell e8a9d47aca
Port over some SP v2 bits (#6516)
* Port over some SP v2 bits

Specifically:

* Add too-large handling to Physical (Consul only for now)
* Contextify some identity funcs
* Update SP protos

* Add size limiting to inmem storage
2019-05-01 13:47:41 -04:00
EdwinRobbins de885660e8 DynamoDB: Make Unlock key delete conditional on being old leader's (#6637) 2019-04-30 17:44:47 -07:00
Jim Kalafut fa2accd000
Exit DynamoDB tryToLock when stop channel is closed (#6640)
* Exit DynamoDB tryToLock when stop channel is closed

If the stop channel is closed (e.g. an error is returned which triggers
close(stop) in Lock), this loop will spin and use 100% CPU.

* Ensure ticker is stopped
2019-04-29 22:51:48 -07:00
Becca Petrin 96374f27c7
Merge pull request #6356 from kedarkale27/master
Update mssql.go
2019-04-23 09:06:14 -07:00
ncabatoff 06574da57a
Merge multiple functions for creating consul containers into one. (#6612)
Merge both functions for creating mongodb containers into one.
Add retries to docker container cleanups.
Require $VAULT_ACC be set to enable AWS tests.
2019-04-22 12:26:10 -04:00
Kedar Kale 435d19bc25 Update mssql.go
Issue with GO Lang not able to execute the USE database line. Fixed the issue by using the database where it is called
2019-04-17 13:41:13 +05:30
Jeff Mitchell 24b92d6e29 Move physical/file to sdk 2019-04-15 14:51:33 -04:00
Jeff Mitchell be78ad2366 Remove dependency on Consul lib dir 2019-04-13 01:35:48 -04:00
Jeff Mitchell 80c303ac83 Move ldaputil and tlsutil over to sdk 2019-04-12 18:26:54 -04:00
Jeff Mitchell 371db36ede Move useragent to sdk 2019-04-12 18:17:49 -04:00
Jeff Mitchell 8bcb533a1b
Create sdk/ and api/ submodules (#6583) 2019-04-12 17:54:35 -04:00
Maarten van der Hoef d98b477a7e Spelling fix (#6523) 2019-04-03 06:57:32 -07:00
Jim Kalafut a939613f78 Reset retry count after a successful lock check (#6522) 2019-04-02 17:08:49 -07:00
Mahmoud Abdelsalam 6479a73f3a Fix dynamodb HA lock race (#6512)
* Fix DynamoDB HA race issue

* Add test for race condition (which fails on the released DynamoDB code)
2019-04-02 16:19:21 -07:00
Kedar Kale 601d839c77 Update mssql_test.go
adding schema env variable
2019-04-02 15:12:30 +05:30
Naoki Ainoya f5345bc711 use option.WithCredentialsFile() instead of deprecated method (#6500) 2019-03-29 10:58:26 -04:00
Kedar Kale b2c51de7ab Update mssql_test.go
added a new line at the end of the code
2019-03-22 12:34:49 +05:30
Kedar Kale b076f25a8e Update mssql_test.go
updated the test case, schema is now written in double quotes
2019-03-22 12:30:44 +05:30
T.K 453f1ac109 changed misspelled english words (#6432) 2019-03-19 09:32:45 -04:00
Lokesh Jain fd994cfceb
Added unit test case 2019-03-13 09:40:09 +05:30
Kedar Kale f930705ed2 Update mssql.go
query will run on the database passed as the parameter instead of the master database
2019-03-06 15:45:41 +05:30
Jeff Mitchell 718ae5a010 Minor syncs 2019-03-04 13:35:22 -05:00
Clint Shryock 7e1a4885e1
fix typo in code comment 2019-02-28 10:26:40 -06:00
Andrey Kuzmin b496fea4ad Etcd timeouts (#6285)
* Configurable lock and request etcd timeouts.

If etcd cluster placed on slow servers - request timeouts may be much greater, then hardcoded default values.
Also, in etcd setup, like above - may be need to greater lock timeout.

* Configurable lock and request etcd timeouts.

Docs.

* Use user friendly timeout syntax.

To allow specify more readable time values.
2019-02-27 18:34:29 -08:00
Jeff Mitchell 82a85aa8c8 Make fmt 2019-02-08 09:12:55 -05:00
Lexman c51de76dd1
adds port parameter (#6145) 2019-02-05 15:40:00 -08:00
Jeff Mitchell 5f249d4005
Add allowed_response_headers (#6115) 2019-02-05 16:02:15 -05:00
Jeff Mitchell bbc1d53a5d Revert "Refactor common token fields and operations into a helper (#5953)"
This reverts commit 66c226c593bb1cd48cfd8364ac8510cb42b7d67a.
2019-02-01 11:23:40 -05:00
Jeff Mitchell 85a560abba
Refactor common token fields and operations into a helper (#5953) 2019-01-30 16:23:28 -05:00
Gordon Shankman cd2f7bbde8 Adding support for SSE in the S3 storage backend. (#5996) 2019-01-26 16:48:08 -05:00
Jeff Mitchell 94e56d964f Fix build 2019-01-23 16:52:51 -05:00
Jeff Mitchell 3f1a7d4fdd
Update to latest etcd and use the new repository packages (#6087)
This will be necessary for go mod work

Additionally, the srv api has changed. This adapts to it.
2019-01-23 14:35:03 -05:00
Becca Petrin aac271ed7f swap the forked aliyun sdk for the original (#6024) 2019-01-23 11:24:51 -05:00
Jim Kalafut f5b19f9ce8
Fix physical/postgresql to return the full entry key (#6044)
Fixes #6041
2019-01-15 12:06:01 -08:00
Jim Kalafut d0e2badbae Run goimports across the repository (#6010)
The result will still pass gofmtcheck and won't trigger additional
changes if someone isn't using goimports, but it will avoid the
piecemeal imports changes we've been seeing.
2019-01-08 16:48:57 -08:00
Julien Blache 91d432fc85 FoundationDB backend TLS support and housekeeping (#5800)
* Fix typo in documentation

* Update fdb-go-install.sh for new release tags

* Exclude FoundationDB bindings from vendoring, delete vendored copy

FoundationDB bindings are tightly coupled to the server version and
client library version used in a specific deployment. Bindings need
to be installed using the fdb-go-install.sh script, as documented in
the foundationdb backend documentation.

* Add TLS support to FoundationDB backend

TLS support appeared in FoundationDB 5.2.4, raising the minimum API version
for TLS-aware FoundationDB code to 520.

* Update documentation for FoundationDB TLS support
2019-01-08 09:01:44 -08:00
Jeff Mitchell c8a029210b
Don't read AWS env vars (#5974)
* Don't read AWS env vars

Let AWS SDK env cred chain provider do it for us

Fixes #5965
2019-01-04 15:03:57 -05:00
bjorndolk 4dbe61568a Physical postgres docker test (#5926)
* Docker support for postgres backend testing

* Bug in handling of postgres connection url for non docker testing

* Test should fail if it cannot retrieve pg version

* internal helperfunctions pascalCasing
2019-01-03 09:25:32 -05:00
Brian Kassouf 9d74c933cf
Update encoding.go 2018-11-19 15:24:41 -08:00
Brian Kassouf 33776b89c2
Wrap storage calls with encoding checks (#5819)
* Add encoding backend

* More work on encoding checks

* Update error message

* Update physical/encoding.go

* Disable key checks if configured
2018-11-19 13:13:16 -08:00
Konstantinos Tsanaktsidis f75e3603ba Paper over GCS backend corruption issues (#5804)
We're having issues with leases in the GCS backend storage being
corrupted and failing MAC checking. When that happens, we need to know
the lease ID so we can address the corruption by hand and take
appropriate action.

This will hopefully prevent any instances of incomplete data being sent
to GSS
2018-11-16 08:07:06 -05:00
Calvin Leung Huang 2824cb534d
Clean up HABackend tests (#5617) 2018-11-01 10:31:09 -07:00
Calvin Leung Huang a08ccbffa7
[Review Only] Autoseal OSS port (#757)
* Port awskms autoseal

* Rename files

* WIP autoseal

* Fix protobuf conflict

* Expose some structs to properly allow encrypting stored keys

* Update awskms with the latest changes

* Add KeyGuard implementation to abstract encryption/decryption of keys

* Fully decouple seal.Access implementations from sealwrap structs

* Add extra line to proto files, comment update

* Update seal_access_entry.go

* govendor sync

* Add endpoint info to configureAWSKMSSeal

* Update comment

* Refactor structs

* Update make proto

* Remove remove KeyGuard, move encrypt/decrypt to autoSeal

* Add rest of seals, update VerifyRecoveryKeys, add deps

* Fix some merge conflicts via govendor updates

* Rename SealWrapEntry to EncryptedBlobInfo

* Remove barrier type upgrade check in oss

* Add key to EncryptedBlobInfo proto

* Update barrierTypeUpgradeCheck signature
2018-10-19 14:43:57 -07:00
dle-fr f86c930855 [5529] Mysql HA: table creation error using InnoDB and utf8 charset (#5543) 2018-10-18 13:35:04 -04:00
Brian Kassouf f52cd4950f
Port some changes (#5518) 2018-10-15 14:06:45 -07:00
Calvin Leung Huang b47e648ddf
Logger cleanup (#5480) 2018-10-09 09:43:17 -07:00
Brian Kassouf 2995c06a53
Fix build (#5457) 2018-10-03 14:53:08 -07:00
Jeff Mitchell 2d908d6962 Fix compile on 32-bit platforms 2018-10-02 14:42:50 -04:00
Saurabh Pal 77e635f7e1 Enable TLS based communication with Zookeeper Backend (#4856)
* The added method customTLSDial() creates a tls connection to the zookeeper backend when 'tls_enabled' is set to true in config

* Update to the document for TLS configuration that is  required to enable TLS connection to Zookeeper backend

* Minor formatting update

* Minor update to the description for example config

* As per review comments from @kenbreeman, additional property description indicating support for multiple Root CAs in a single file has been added

* minor formatting
2018-10-01 14:12:08 -07:00
Becca Petrin 3da8d38e7d point at a fork of aliyun-oss-go-sdk (#5358) 2018-10-01 10:05:08 -07:00
Jeff Mitchell 33065a60db Fix compilation/protobuf 2018-09-22 17:58:39 -04:00
pavel-usov 470131d100 Change in GET_LOCK call to make it MariaDB compatilble (#5343)
* Update mysql.go

Change in GET_LOCK call to make it MariaDB compatilble

* Use math.MaxUint32 for lock timeout, add comments
2018-09-19 12:05:04 -07:00
Jeff Mitchell 919b968c27
The big one (#5346) 2018-09-17 23:03:00 -04:00
Jeff Mitchell ea08052120
Add an option to log all ops to inmem (#5306) 2018-09-07 17:35:46 -04:00
Jeff Mitchell 09d97b1eca
Cache negative results in physical cache (#5303) 2018-09-07 14:56:33 -04:00
Jeff Mitchell d57dfc1875 Move things back 2018-08-29 19:13:10 -04:00
Jeff Mitchell c6f7312f6c Move physical types around 2018-08-29 19:05:33 -04:00
Jeff Mitchell 05a896703c Move sort from listresponse to file backend to solve 5141 2018-08-24 13:37:15 -04:00
Oleksiy Kovyrin 1fe159ccb8 A simple copy-paste fix (#5130)
The test for MySQL HA backend seems to have been based on the Zookeeper one and the error message in it did not get updated to be MySQL-specific.
2018-08-17 08:46:56 -04:00
brianvans f79385346f Add ha_enabled for mysql backend (#5122)
* Slight cleanup around mysql ha lock implementation

* Removes some duplication around lock table naming
* Escapes lock table name with backticks to handle weird characters
* Lock table defaults to regular table name + "_lock"
* Drop lock table after tests run

* Add `ha_enabled` option for mysql storage

It defaults to false, and we gate a few things like creating the lock
table and preparing lock related statements on it
2018-08-16 11:03:16 -07:00
Christoph Ludwig 24a368c1ba Add support for "sovereign" Azure cloud environments (#4997)
* Add support for "sovereign" Azure cloud environments

* Shorten variable names
2018-08-15 19:40:36 -04:00
Seth Vargo 6dcecbdfda Fix Google Cloud races (#5081)
* storage/gcs: fix race condition in releasing lock

Previously we were deleting a lock without first checking if the lock we were deleting was our own. There existed a small period of time where vault-0 would lose leadership and vault-1 would get leadership. vault-0 would delete the lock key while vault-1 would write it. If vault-0 won, there'd be another leader election, etc.

This fixes the race by using a CAS operation instead.

* storage/gcs: properly break out of loop during stop

* storage/spanner: properly break out of loop during stop
2018-08-14 09:53:36 -04:00
Nándor István Krácser b9fab6375b Alibaba Object Storage support (#4783) 2018-08-13 17:03:24 -04:00
Michael Schuett 63e7ac034f MySQL HA Backend Support (#4686) 2018-08-13 17:02:31 -04:00
bohr 79b571d90d add backtick to fix mysql database name contain special characters (#5054)
when use mysql storage, set` database = "dev-dassets-bc"` , create database and create table will throw exceptions as follows:

    Error initializing storage of type mysql: failed to create mysql database: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-dassets-bc' at line 1
    Error initializing storage of type mysql: failed to create mysql table: Error 1046: No database selected

cause of `-` is  a MySQL  built-in symbol. so add backtick for create database sql\create table sql \dml sqls.
2018-08-10 16:38:20 -07:00
Calvin Leung Huang b5c8b3d4c5 Clean up container on connection failure, switch to ory/dockertest on package postgresql (#5050) 2018-08-07 09:56:33 -07:00
Jeff Mitchell 4261618d10 Add request timeouts in normal request path and to expirations (#4971)
* Add request timeouts in normal request path and to expirations

* Add ability to adjust default max request duration

* Some test fixes

* Ensure tests have defaults set for max request duration

* Add context cancel checking to inmem/file

* Fix tests

* Fix tests

* Set default max request duration to basically infinity for this release for BC

* Address feedback
2018-07-24 14:50:49 -07:00
Chris Hoffman 45be1ee3e1
Read all pages when list results are paged (#4983) 2018-07-24 14:24:32 -04:00
Julien Blache c8fb9ed6a8 FoundationDB physical backend (#4900) 2018-07-16 10:18:09 -04:00
Richie Yeung 8fb804ecce Fix empty string check for password (#4923) 2018-07-13 12:35:06 -07:00
Seth Vargo 76d72a5e86 Use context from stdlib in google physical backends (#4922)
* Use context from stdlib in google physical backends

* Do not prefix logs (Vault will do it)
2018-07-13 11:00:38 -04:00
Jeff Mitchell b85a5da767 Change x/net context package to go stdlib 2018-07-13 10:59:34 -04:00
Jeff Mitchell db9abad3c9 Remove unnecessary log scoping in some physical backends 2018-07-13 10:57:30 -04:00
Jeff Mitchell 4b354e1110
Re-add dockertest and fix up imports and update script (#4909) 2018-07-11 17:49:13 -04:00
Md. Nure Alam Nahid 7b9bedf94d Add additional config keys for swift (#4901)
* Add additional config keys for swift

* Add additional swift config keys in the doc page
2018-07-11 08:29:29 -07:00
Jeff Mitchell 28890ee198 Make proto
It appears the only thing that actually change is that the tag got
`proto3` values added.
2018-07-10 20:49:48 -04:00
Jeff Mitchell e52b554c0b
Add an idle timeout for the server (#4760)
* Add an idle timeout for the server

Because tidy operations can be long-running, this also changes all tidy
operations to behave the same operationally (kick off the process, get a
warning back, log errors to server log) and makes them all run in a
goroutine.

This could mean a sort of hard stop if Vault gets sealed because the
function won't have the read lock. This should generally be okay
(running tidy again should pick back up where it left off), but future
work could use cleanup funcs to trigger the functions to stop.

* Fix up tidy test

* Add deadline to cluster connections and an idle timeout to the cluster server, plus add readheader/read timeout to api server
2018-06-16 18:21:33 -04:00
Jeff Mitchell 75eb0f862e
Revert some of commit 050ab805a7565c5b0cadb0176023031ee5f0d17b. (#4768)
If we have a panic defer functions are run but unlocks aren't. Since we
can't really trust plugins and storage, this backs out the changes for
those parts of the request path.
2018-06-14 13:44:13 -04:00
Jeff Mitchell 0c2d2226c4
Remove a lot of deferred functions in the request path. (#4733)
* Remove a lot of deferred functions in the request path.

There is an interesting benchmark at https://www.reddit.com/r/golang/comments/3h21nk/simple_micro_benchmark_to_measure_the_overhead_of/

It shows that defer actually adds quite a lot of overhead -- maybe 100ns
per call but we defer a *lot* of functions in the request path. So this
removes some of the ones in request handling, ha, barrier, router, and
physical cache.

One meta-note: nearly every metrics function is in a defer which means
every metrics call we add could add a non-trivial amount of time, e.g.
for every 10 extra metrics statements we add 1ms to a request. I don't
know how to solve this right now without doing what I did in some of
these cases and putting that call into a simple function call that then
goes before each return.

* Simplify barrier defer cleanup
2018-06-14 09:49:10 -04:00
Jim Kalafut 1f648271b6
Add DynamoDB marshaling update test (#4746)
This test fails before the d3604289be99 update.
2018-06-12 08:22:02 -07:00
Jeff Mitchell 8d3503a048
Add context handling to Consul operations (#4739) 2018-06-11 11:03:00 -04:00
Jeff Mitchell f32cb9e905 Fix another test error 2018-06-09 18:31:47 -04:00
Jeff Mitchell 16356a3969 Fix nil pointer in transactional_inmem 2018-06-09 18:22:45 -04:00
Jeff Mitchell 8916f6b625
Some atomic cleanup (#4732)
Taking inspiration from
https://github.com/golang/go/issues/17604#issuecomment-256384471
suggests that taking the address of a stack variable for use in atomics
works (at least, the race detector doesn't complain) but is doing it
wrong.

The only other change is a change in Leader() detecting if HA is enabled
to fast-path out. This value never changes after NewCore, so we don't
need to grab the read lock to check it.
2018-06-09 15:35:22 -04:00
Jeff Mitchell 04ad8c7eb3
Fix swallowed err from gcs close calls (#4706) 2018-06-05 15:27:02 -04:00
Jeff Mitchell 3993f126e5
Do some best-effort cleanup in file backend (#4684)
* Do some best-effort cleanup in file backend

If put results in an encoding error and after the file is closed we
detect it's zero bytes, it could be caused by an out of space error on
the disk since file info is often stored in filesystem metadata with
reserved space. This tries to detect that scenario and perform
best-effort cleanup. We only do this on zero length files to ensure that
if an encode fails to write but the system hasn't already performed
truncation, we leave the existing data alone.

Vault should never write a zero-byte file (as opposed to a zero-byte
value in the encoded JSON) so if this case is hit it's always an error.

* Also run a check on Get
2018-06-04 19:41:36 -04:00