Commit Graph

516 Commits

Author SHA1 Message Date
Marko
2ac5a559b4 libs: wrap mutexes for build flag with godeadlock (#5126)
## Description

This PR wraps the stdlib sync.(RW)Mutex & godeadlock.(RW)Mutex. This enables using go-deadlock via a build flag instead of using sed to replace sync with godeadlock in all files

Closes: #3242
2020-07-20 07:55:09 +00:00
Anton Kaliaev
16216028a1 proxy: improve ABCI app connection handling (#5078)
Closes #5074 

Old code does not work when --consensus.create_empty_blocks=false
(because it only calls tmos.Kill when ApplyBlock fails). New code is
listening ABCI clients for Quit and kills TM process if there were any
errors.
2020-07-08 12:07:11 +00:00
Callum Waters
65d7ce9c9c evidence: improve amnesia evidence handling (#5003)
fix bug so that PotentialAmnesiaEvidence is being gossiped

handle inbound amnesia evidence correctly

add method to check if potential amnesia evidence is on trial

fix a bug with the height when we upgrade to amnesia evidence

change evidence to using just pointers.

More logging in the evidence module

Co-authored-by: Marko <marbar3778@yahoo.com>
2020-06-23 17:09:14 +02:00
Marko
dedf0d2350 proto: folder structure adhere to buf (#5025) 2020-06-22 10:00:51 +02:00
Marko
51da4fe356 types: rename partsheader to partsetheader (#5029)
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
2020-06-22 09:38:03 +02:00
Marko
f6243d8b9e privval: migrate to protobuf (#4985) 2020-06-11 11:54:02 +02:00
Marko
d54de61bf6 consensus: proto migration (#4984)
## Description

migrate consensus to protobuf

Closes: #XXX
2020-06-10 12:08:47 +00:00
Anton Kaliaev
65909a13d5 consensus: stricter on LastCommitRound check (#4970)
LastCommitRound should always be >= 0 for heights > 1.

In State.updateToState, last precommit is computed  only when round
greater than -1 and has votes. But "LastCommit" is always updated
regardless of the condition. If there's no last precommit, "LastCommit"
is set to (*types.VoteSet)(nil). That's why "LastCommit" can be -1 for
heights > 1.

To fix it, only update State.RoundState.LastCommit when there is last
precommit.

Fixes #2737

Co-authored-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2020-06-10 11:13:38 +04:00
Erik Grinaker
db8f1b3df3 migrate all JSON to new JSON encoder (#4975)
Uses new JSON encoder in #4955 for all JSON. Branched off of #4968.
2020-06-08 12:22:59 +00:00
Marko
f9f4916bc3 store: proto migration (#4974)
## Description

migrate store to protobuf

Closes: #XXX
2020-06-08 06:43:29 +00:00
Callum Waters
d4f1876d12 consensus: change logging and handling of height mismatch (#4954) 2020-06-05 15:04:45 +02:00
Marko
a88537bb88 ints: stricter numbers (#4939) 2020-06-04 16:34:56 +02:00
Alessio Treglia
c8483531d8 consensus: attempt to repair the WAL file on data corruption (#4682)
Closes: #4578

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
2020-06-03 15:14:12 +04:00
Joe Bowman
8b50ff60d9 only retrieve pubkey once for all validators (partially fixes #4865) (#4895)
## Description

in consensus/state.go, when calulating metrics, retrieve address (ergo, pubkey) once prior to iterating over validatorset to ensure we do not make excessive calls to signer.

Partially closes: #4865
2020-05-29 06:15:46 +00:00
Anton Kaliaev
287110d425 consensus: bring back log.Error statement (#4899)
Refs #3406

cs.Logger is protected by a global mutex, so it cannot be a reason for
the halt in #3401.
2020-05-27 13:31:02 +04:00
Marko
9149ee7d8b lint: various fixes
## Description

various linitng fixes
2020-05-18 10:20:06 +00:00
Anton Kaliaev
b7b721c484 change use of errors.Wrap to fmt.Errorf with %w verb
Closes #4603

Commands used (VIM):

```
:args `rg -l errors.Wrap`
:argdo normal @q | update
```

where q is a macros rewriting the `errors.Wrap` to `fmt.Errorf`.
2020-05-12 03:35:47 +00:00
Callum Waters
7cb3d90e01 evidence: create proof of lock change and implement it in evidence store (#4746)
creates a proof of lock change which is an array of votes that proves the validator was permitted to change locked block and vote again. This proof is stored in the evidence pool and is used as a part of amnesia evidence
2020-05-11 17:06:01 +02:00
Callum Waters
9535c47067 consensus: fix and rename TestStateLockPOLRelock (#4796)
correct test in consensus so that node relocks on same block and then changes lock when majority of another block is reached
2020-05-07 12:48:48 +02:00
Erik Grinaker
4298bbcc4e add support for block pruning via ABCI Commit response (#4588)
* Added BlockStore.DeleteBlock()

* Added initial block pruner prototype

* wip

* Added BlockStore.PruneBlocks()

* Added consensus setting for block pruning

* Added BlockStore base

* Error on replay if base does not have blocks

* Handle missing blocks when sending VoteSetMaj23Message

* Error message tweak

* Properly update blockstore state

* Error message fix again

* blockchain: ignore peer missing blocks

* Added FIXME

* Added test for block replay with truncated history

* Handle peer base in blockchain reactor

* Improved replay error handling

* Added tests for Store.PruneBlocks()

* Fix non-RPC handling of truncated block history

* Panic on missing block meta in needProofBlock()

* Updated changelog

* Handle truncated block history in RPC layer

* Added info about earliest block in /status RPC

* Reorder height and base in blockchain reactor messages

* Updated changelog

* Fix tests

* Appease linter

* Minor review fixes

* Non-empty BlockStores should always have base > 0

* Update code to assume base > 0 invariant

* Added blockstore tests for pruning to 0

* Make sure we don't prune below the current base

* Added BlockStore.Size()

* config: added retain_blocks recommendations

* Update v1 blockchain reactor to handle blockstore base

* Added state database pruning

* Propagate errors on missing validator sets

* Comment tweaks

* Improved error message

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* use ABCI field ResponseCommit.retain_height instead of retain-blocks config option

* remove State.RetainHeight, return value instead

* fix minor issues

* rename pruneHeights() to pruneBlocks()

* noop to fix GitHub borkage

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
2020-04-03 08:38:32 +00:00
Marko
48f073d796 privval: return error on getpubkey (#4534)
closes #3602

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
2020-03-12 11:10:36 +04:00
Erik Grinaker
8f48c49543 Fix some golangci-lint warnings (#4448) 2020-02-20 13:43:40 +01:00
tau3
b7dab3b8ab consensus: reduce log severity for ErrVoteNonDeterministicSignature (#4431)
from error to debug

Closes #3583
2020-02-19 16:21:27 +01:00
Erik Grinaker
66a544a640 Fix broken /docs/spec links (#4376) 2020-02-07 12:53:28 +01:00
Anton Kaliaev
db235c8df0 cs: check if cs.privValidator is nil (#4295)
before getting its address in recordMetrics

Refs https://github.com/tendermint/tendermint/pull/4294#discussion_r364347586
2020-01-09 16:25:59 +04:00
Marko
d7f4ce30ca metrics: only increase last_signed_height if commitSig for block (#4283)
- follow up to #4263
- when a commit is nil, then it should be counted as a missed commit

Signed-off-by: Marko Baricevic marbar3778@yahoo.com
2020-01-07 12:09:26 +04:00
Marko
7368ba358b prometheus/metrics: three new metrics for consensus (#4263)
* prometheus/metrics: two new metrics for consensus

- add consensus_validator_power metric so if a node is a validator it can see its own power in prometheus
- add last_signed_height metric so if a node is a validator it can be aware of at which height the most recent time it signed.

- closes: #3773
- closes: #3083

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* check if signature is present

* minor change and check if sig is not absent

* add changelog entry

* Update consensus/state.go

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* Update CHANGELOG_PENDING.md

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* Update CHANGELOG_PENDING.md

* add label with validator address

* change address to vali_address

* add metric missed blocks

* add changelog entry for missed blocks metric

* address naming & add docs
2019-12-19 18:04:57 +01:00
Anton Kaliaev
fff7f450be cs: set missing_validators(_power) metrics to 0 for 1st block (#4194)
also

    - do not send any LastCommitInfo.Votes for 1st block.
    - use cs.LastValidators (not cs.Validators) in recordMetrics when counting missing validators

note:

remember that the first LastCommit is intentionally empty, so it makes
sense for LastCommitInfo.Votes to also be empty. Because we can't really
tell if validator signed or not. Similar for ^ metrics, we can't say if
particular validator was missing or not.

Closes #4192
2019-12-18 19:46:21 +04:00
Marko
7b52f51700 libs/common: Refactor libs/common 5 (#4240)
* libs/common: Refactor libs/common 5

- move mathematical functions and types out of `libs/common` to math pkg
- move net functions out of `libs/common` to net pkg
- move string functions out of `libs/common` to strings pkg
- move async functions out of `libs/common` to async pkg
- move bit functions out of `libs/common` to bits pkg
- move cmap functions out of `libs/common` to cmap pkg
- move os functions out of `libs/common` to os pkg

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* fix testing issues

* fix tests

closes #41417

woooooooooooooooooo kill the cmn pkg

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* add changelog entry

* fix goimport issues

* run gofmt
2019-12-12 09:33:27 +01:00
Marko
27b00cf8d1 libs/common: refactor libs common 3 (#4232)
* libs/common: refactor libs common 3

- move nil.go into types folder and make private
- move service & baseservice out of common into service pkg

ref #4147

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* add changelog entry
2019-12-11 09:31:25 +01:00
Marko
3e2751d274 lint: Enable Golint (#4212)
* Fix many golint errors

* Fix golint errors in the 'lite' package

* Don't export Pool.store

* Fix typo

* Revert unwanted changes

* Fix errors in counter package

* Fix linter errors in kvstore package

* Fix linter error in example package

* Fix error in tests package

* Fix linter errors in v2 package

* Fix linter errors in consensus package

* Fix linter errors in evidence package

* Fix linter error in fail package

* Fix linter errors in query package

* Fix linter errors in core package

* Fix linter errors in node package

* Fix linter errors in mempool package

* Fix linter error in conn package

* Fix linter errors in pex package

* Rename PEXReactor export to Reactor

* Fix linter errors in trust package

* Fix linter errors in upnp package

* Fix linter errors in p2p package

* Fix linter errors in proxy package

* Fix linter errors in mock_test package

* Fix linter error in client_test package

* Fix linter errors in coretypes package

* Fix linter errors in coregrpc package

* Fix linter errors in rpcserver package

* Fix linter errors in rpctypes package

* Fix linter errors in rpctest package

* Fix linter error in json2wal script

* Fix linter error in wal2json script

* Fix linter errors in kv package

* Fix linter error in state package

* Fix linter error in grpc_client

* Fix linter errors in types package

* Fix linter error in version package

* Fix remaining errors

* Address review comments

* Fix broken tests

* Reconcile package coregrpc

* Fix golangci bot error

* Fix new golint errors

* Fix broken reference

* Enable golint linter

* minor changes to bring golint into line

* fix failing test

* fix pex reactor naming

* address PR comments
2019-12-05 10:12:08 +01:00
Anton Kaliaev
ad715fe966 types: change Commit to consist of just signatures (#4146)
* types: change `Commit` to consist of just signatures

These are final changes towards removing votes from commit and leaving
only signatures (see ADR-25)

Fixes #1648

* bring back TestCommitToVoteSetWithVotesForAnotherBlockOrNilBlock

+ add absent flag to Vote to indicate that it's for another block

* encode nil votes as CommitSig with BlockIDFlagAbsent

+ make Commit#Precommits array of non-pointers
because precommit will never be nil

* add NewCommitSigAbsent and Absent() funcs

* uncomment validation in CommitSig#ValidateBasic

* add comments to ValidatorSet funcs

* add a changelog entry

* break instead of continue

continue does not make sense in these cases

* types: rename Commit#Precommits to Signatures

* swagger: fix /commit response

* swagger: change block_id_flag type

* fix merge conflicts
2019-11-26 14:10:38 +04:00
Anton Kaliaev
3e1516b624 linters: enable stylecheck (#4153)
Refs #3262
2019-11-16 19:35:39 +04:00
Marko
1604047c39 abci: remove TotalTxs and NumTxs from Header (#3783)
* Removal of TotalTx & NumTx

- Removed totalTx and numTx

closes #2521

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* abci proto changes

* proto number fix

* txfilter_test fix

* comments on PR

* further changes

* bring back metrics

* fix indexer

* fix TestBlockMaxDataBytes and TestBlockMaxDataBytesUnknownEvidence

* indexer service back to header

* statistics.go fix

* fix ci

* listen for blocks, not headers

to be able to record txs throughput

* fix TestNetworkNewBlock

* fix tests

* fix tests in types package

* fixes after Anton's review

* fix tests

* bring back `consensus_total_txs` metric

I mistakenly thought it was removed.

* improve changelog

* remove LastBlockTotalTx from state

* docs: remove getNumTxs from BeginBlock Java example
2019-11-14 13:56:12 +04:00
Marko
5206ce32a0 Update master (#4087)
* cs: panic only when WAL#WriteSync fails

- modify WAL#Write and WAL#WriteSync to return an error

* fix test

* types: validate Part#Proof

add ValidateBasic to crypto/merkle/SimpleProof

* cs: limit max bit array size and block parts count

* cs: test new limits

* cs: only assert important stuff

* update changelog and bump version to 0.32.7

* fixes after Ethan's review

* align max wal msg and max consensus msg sizes

* fix tests

* fix test

* add change log for 31.11
2019-10-30 12:25:58 -07:00
Phil Salant
bc572217c0 Fix linter errors thrown by lll (#3970)
* Fix long line errors in abci, crypto, and libs packages

* Fix long lines in p2p and rpc packages

* Fix long lines in abci, state, and tools packages

* Fix long lines in behaviour and blockchain packages

* Fix long lines in cmd and config packages

* Begin fixing long lines in consensus package

* Finish fixing long lines in consensus package

* Add lll exclusion for lines containing URLs

* Fix long lines in crypto package

* Fix long lines in evidence package

* Fix long lines in mempool and node packages

* Fix long lines in libs package

* Fix long lines in lite package

* Fix new long line in node package

* Fix long lines in p2p package

* Ignore gocritic warning

* Fix long lines in privval package

* Fix long lines in rpc package

* Fix long lines in scripts package

* Fix long lines in state package

* Fix long lines in tools package

* Fix long lines in types package

* Enable lll linter
2019-10-17 10:42:28 +02:00
Anton Kaliaev
c4294bd4d7 cs: check for SkipTimeoutCommit or wait timeout in handleTxsAvailable (#3928)
* cs: check for SkipTimeoutCommit or wait timeout in handleTxsAvailable

Previously, if create_empty_blocks was set to false, TM sometimes could
create 2 consecutive blocks without actually waiting for timeoutCommit
(1 sec. by default).

```
I[2019-08-29|07:32:43.874] Executed block                               module=state height=47 validTxs=10 invalidTxs=0
I[2019-08-29|07:32:43.876] Committed state                              module=state height=47 txs=10 appHash=F88C010000000000
I[2019-08-29|07:32:44.885] Executed block                               module=state height=48 validTxs=2 invalidTxs=0
I[2019-08-29|07:32:44.887] Committed state                              module=state height=48 txs=2 appHash=FC8C010000000000
I[2019-08-29|07:32:44.908] Executed block                               module=state height=49 validTxs=8 invalidTxs=0
I[2019-08-29|07:32:44.909] Committed state                              module=state height=49 txs=8 appHash=8C8D010000000000
I[2019-08-29|07:32:45.886] Executed block                               module=state height=50 validTxs=2 invalidTxs=0
I[2019-08-29|07:32:45.895] Committed state                              module=state height=50 txs=2 appHash=908D010000000000
I[2019-08-29|07:32:45.908] Executed block                               module=state height=51 validTxs=8 invalidTxs=0
I[2019-08-29|07:32:45.909] Committed state                              module=state height=51 txs=8 appHash=A08D010000000000
```

This commit fixes that by adding a check to handleTxsAvailable.

Fixes #3908

* update changelog

* schedule timeoutCommit if StartTime is in the future

or SkipTimeoutCommit=true && we DON'T have all the votes

* fix TestReactorCreatesBlockWhenEmptyBlocksFalse

by checking if we have LastCommit or not

* address Ethan's comments
2019-09-10 16:38:37 +04:00
Phil Salant
04d13d9945 fix linter errors thrown by unconvert, goconst, and nakedret (#3960)
* Remove unnecessary type conversions

* Consolidate repeated strings into consts

* Clothe return statements

* Update blockchain/v1/reactor_fsm_test.go

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

This PR repairs linter errors seen when running the following commands:
golangci-lint run --no-config --disable-all=true --enable=unconvert
golangci-lint run --no-config --disable-all=true --enable=goconst
golangci-lint run --no-config --disable-all=true --enable=nakedret

Contributes to #3262
2019-09-10 11:31:44 +04:00
Marko
eec6d33e14 remove mentions of go-wire (#3904)
*    Cleanup go-wire mentions
*    remove Roadmap.md
*    build_race in makefile was failing

ref #2790
2019-08-16 17:45:19 +04:00
Anton Kaliaev
4da3de79a7 consensus: reduce "Error attempting to add vote" message severity (Er… (#3871)
* consensus: reduce "Error attempting to add vote" message severity (Error -> Info)

Fixes #3839

* add missing changelog entry
2019-08-03 00:00:18 +04:00
Marko
f9cce282da gocritic (2/2) (#3864)
Refs #3262
2019-08-02 10:53:52 +04:00
Marko
41bf54a906 gocritic (1/2) (#3836)
Add gocritic as a linter

    The linting is not complete, but should i complete in this PR or in a following.

    23 files have been touched so it may be better to do in a following PR


Commits:

* Add gocritic to linting

- Added gocritic to linting

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* gocritic

* pr comments

* remove switch in cmdBatch
2019-07-30 18:13:35 +04:00
Marko
98cb8c9783 add staticcheck linting (#3828)
cleanup to add linter

    grpc change:
        https://godoc.org/google.golang.org/grpc#WithContextDialer
        https://godoc.org/google.golang.org/grpc#WithDialer
        grpc/grpc-go#2627
    prometheous change:
        due to UninstrumentedHandler, being deprecated in the future
    empty branch = empty if or else statement
        didn't delete them entirely but commented
        couldn't find a reason to have them
    could not replicate the issue #3406
        but if want to keep it commented then we should comment out the if statement as well
2019-07-25 09:35:30 +04:00
Ethan Buchman
4905640e9b types: CommitVotes struct as last step towards #1648 (#3298)
* VoteSignBytes builds CanonicalVote

* CommitVotes implements VoteSetReader

- new CommitVotes struct holds both the Commit and the ValidatorSet and
  implements VoteSetReader
- ToVote takes a ValidatorSet

* fix TestCommit

* use CommitSig.BlockID

Commits may include votes for a different BlockID, could be nil,
or different altogether. This means we can't use `commit.BlockID`
for reconstructing the sign bytes, since up to -1/3 of the commits
might be for independent BlockIDs. This means CommitSig will need to
include an indicator for what BlockID it signed - if it's not the
committed one or nil, it will need to include it fully in order to be
verified. This is unfortunate but unavoidable so long as we include
votes for non-committed BlockIDs (which we do to track validator
liveness)

* fixes from review

* remove CommitVotes. CommitSig contains address

* remove commit.canonicalVote method

* toVote -> getVote, takes valIdx

* update adr-025

* commit.ToVoteSet -> CommitToVoteSet

* add test

* fix from review
2019-05-05 18:01:35 +02:00
Thane Thomson
70592cc4d8 libs/common: remove deprecated PanicXXX functions (#3595)
* Remove deprecated PanicXXX functions from codebase

As per discussion over
[here](https://github.com/tendermint/tendermint/pull/3456#discussion_r278423492),
we need to remove these `PanicXXX` functions and eliminate our
dependence on them. In this PR, each and every `PanicXXX` function call
is replaced with a simple `panic` call.

* add a changelog entry
2019-04-26 14:23:43 +04:00
Anton Kaliaev
3035572034 cs: comment out log.Error to avoid TestReactorValidatorSetChanges timing out (#3401) 2019-03-11 22:52:09 +04:00
Anton Kaliaev
b6a510a3e7 make ineffassign linter pass (#3386)
Refs #3262

This fixes two small bugs:

1) lite/dbprovider: return `ok` instead of true in parse* functions. It's weird that we're ignoring `ok` value before.
2) consensus/state: previously because of the shadowing we almost never output "Error with msg". Now we declare both `added` and `err` in the beginning of the function, so there's no shadowing.
2019-03-08 09:46:09 +04:00
Anton Kaliaev
52771e1287 make BlockTimeIota a consensus parameter, not a locally configurable … (#3048)
* make BlockTimeIota a consensus parameter, not a locally configurable option

Refs #2920

* make TimeIota int64 ms

Refs #2920

* update Gopkg.toml

* fixes after Ethan's review

* fix TestRemoteSignerProposalSigningFailed

* update changelog
2019-03-04 13:24:44 +04:00
Anton Kaliaev
ec9bff5234 rename WAL#Flush to WAL#FlushAndSync (#3345)
* rename WAL#Flush to WAL#FlushAndSync

- rename auto#Flush to auto#FlushAndSync
- cleanup WAL interface to not leak implementation details!
  * remove Group()
  * add WALReader interface and return it in SearchForEndHeight()
- add interface assertions

Refs #3337

* replace WALReader with io.ReadCloser
2019-02-25 09:11:07 +04:00
Thane Thomson
dff3deb2a9 cs: sync WAL more frequently (#3300)
As per #3043, this adds a ticker to sync the WAL every 2s while the WAL is running.

* Flush WAL every 2s

This adds a ticker that flushes the WAL every 2s while the WAL is
running. This is related to #3043.

* Fix spelling

* Increase timeout to 2mins for slower build environments

* Make WAL sync interval configurable

* Add TODO to replace testChan with more comprehensive testBus

* Remove extraneous debug statement

* Remove testChan in favour of using system time

As per
https://github.com/tendermint/tendermint/pull/3300#discussion_r255886586,
this removes the `testChan` WAL member and replaces the approach with a
system time-oriented one. In this new approach, we keep track of the
system time at which each flush and periodic flush successfully
occurred.

The naming of the various functions is also updated here to be more
consistent with "flushing" as opposed to "sync'ing".

* Update naming convention and ensure lock for timestamp update

* Add Flush method as part of WAL interface

Adds a `Flush` method as part of the WAL interface to enforce the idea
that we can manually trigger a WAL flush from outside of the WAL. This
is employed in the consensus state management to flush the WAL prior to
signing votes/proposals, as per https://github.com/tendermint/tendermint/issues/3043#issuecomment-453853630

* Update CHANGELOG_PENDING

* Remove mutex approach and replace with DI

The dependency injection approach to dealing with testing concerns could
allow similar effects to some kind of "testing bus"-based approach. This
commit introduces an example of this, where instead of relying on
(potentially fragile) timing of things between the code and the test, we
inject code into the function under test that can signal the test
through a channel.

This allows us to avoid the `time.Sleep()`-based approach previously
employed.

* Update comment on WAL flushing during vote signing

Co-Authored-By: thanethomson <connect@thanethomson.com>

* Simplify flush interval definition

Co-Authored-By: thanethomson <connect@thanethomson.com>

* Expand commentary on WAL disk flushing

Co-Authored-By: thanethomson <connect@thanethomson.com>

* Add broken test to illustrate WAL sync test problem

Removes test-related state (dependency injection code) from the WAL data
structure and adds test code to illustrate the problem with using
`WALGenerateNBlocks` and `wal.SearchForEndHeight` to test periodic
sync'ing.

* Fix test error messages

* Use WAL group buffer size to check for flush

A function is added to `libs/autofile/group.go#Group` in order to return
the size of the buffered data (i.e. data that has not yet been flushed
to disk). The test now checks that, prior to a `time.Sleep`, the group
buffer has data in it. After the `time.Sleep` (during which time the
periodic flush should have been called), the buffer should be empty.

* Remove config root dir removal from #3291

* Add godoc for NewWAL mentioning periodic sync
2019-02-20 09:45:18 +04:00