Split all the fields in `cfg` structure on:
1. `applicationConfiguration`;
2. `internals`; // shared entities for an application work, such as
`context.Context`
3. `shared`; // holder for the shared entities b/w;
4. `cfgXXX`; // configuration for internal services.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
In previous implementation node blocked any operation of local object
storage in maintenance mode. There is a need to perform some storage
operations like data evacuation or restoration.
Do not call block storage engine in maintenance mode. Make all Object
service operations to return `apistatus.NodeUnderMaintenance` error from
each local op.
Signed-off-by: Leonard Lyubich <ctulhurider@gmail.com>
Make `netmap snapshot` command to print `MAINTENANCE` state of the nodes
with `IsMaintenance()` flag set.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
After recent Netmap contract changes all read methods which return
network map (either candidates or snapshots) encode node descriptors
into same structure.
Decode `netmap.Node` contract-side structure from the call results.
Replace node state with the value from the `netmap.Node.State` field.
Signed-off-by: Leonard Lyubich <ctulhurider@gmail.com>
Make storage node to return `NODE_UNDER_MAINTENANCE` status
error on each local object operation if the node is in `MAINTENANCE`
mode.
Pass `apistatus.NodeUnderMaintenance` to `StorageEngine.BlockExecution`
during `ControlService.SetNetmapStatus` RPC processing.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
After recent changes `MAINTENANCE` state is reflected in the Sidechain.
Storage node should switch its state to "maintenance" during serving the
`ControlService.SetNetmapStatus` RPC with correspoding status in the
request.
Call `UpdatePeerState` operation of Netmap contract's client in
`control.NodeState` provider on Storage node app side. The op is
executed if `BlockExecution` on local object storage is succeeded.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
After recent changes network configuration provided by NeoFS storage
nodes contains `MaintenanceModeAllowed` flag. There is
a need to support this value in NeoFS CLI application.
Print `MaintenanceModeAllowed` flag in `netmap netinfo` command.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
After recent changes network configuration stored in the Netmap contract
of the NeoFS Sidechain contains `MaintenanceModeAllowed` flag. There is
a need to support this value in Storage node application.
Make `NetmapService.NetworkInfo` RPC server of the storage node to set
`MaintenanceModeAllowed` flag according to corresponding value in the
Sidechain.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
`NetworkConfiguration` represents NeoFS network configuration stored in
the Sidechain. In previous implementation the configuration missed flag
of disabled homomorphic hashing.
Add `NetworkConfiguration.HomomorphicHashingDisabled` boolean field.
Decode the field in `Client.ReadNetworkConfiguration` method. Print this
value in `netmap netinfo` command of NeoFS CLI.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
In previous implementation storage node interpreted all status values
sent in `SetNetmapStatus` RPC as `OFFLINE` except `ONLINE` and
`MAINTENANCE`. This could lead to incorrect processing of new values,
and also didn't allow detection of problems with sending garbage values.
Make implementation of `NodeState` interface used by Control API server
to deny requests with statuses other than protocol-declared enum.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
It will allow rereading config values and will simplify distinguishing them
from the custom values in the `cfg` structure.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Negative values have no sense. On the other hand it differs from the
blobovnicza's configuration and prevents unification.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Replace `ProcessCurrentNetMap` method of `NodeState` interface with
`ReadCurrentNetMap` one with two changes:
* Replace network map type from NeoFS SDK package with the
protocol-generated message. This replaces all the business logic to
the application layer.
* Support error return. This allows to cover problem node states.
Return an error from `NodeState.ReadCurrentNetMap` method implemeted
through `atomic.Value` if `Store` method has not been called yet.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
1. Do not require a request to be signed by the container owner if a
bearer token is missing
2. Do not check the system role since public requests are not expected to
be signed by IR or a container node (unlike the object requests)
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
There is a need to have the ability to track NeoFS timeline on storage
nodes. Epochs tick on notifications receipt, so the most obvious way to
know about received epochs is logging the events.
Wrap `morphEvent.ParseNewEpoch` event parser into function which writes
log message about new epoch number.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Implement methods that `actor.Actor` requires:
1. `InvokeFunction` -- wrapper over `InvokeScript`
2. `GetVersion` returns default struct
3. `CalculateNetworkFee` copied and simplified from Neo-go server side.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
NNS proposal describes string N3 address format, however we must also
have hex-string for backwards compatibility.
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
In case we already have the record and it is invalid, we should
overwrite it instead of having several conflicting records.
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
NEO NNS proposal uses addresses. We should eventually use the same,
but must stay compatible now.
Signed-off-by: Evgenii Stratonikov <evgeniy@morphbits.ru>
Flag `--pre-check` of `set-eacl` command found to be in demand in most
cases. based on this, it makes sense to add its action to the default
behavior.
Pre-check container extensibility by default. Rename flag to
`--no-precheck` and invert its action.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Container ACL in NeoFS can be extended only for container in which the
corresponding option is enabled. In previous implementation command
`set-eacl` could hang up on modifying eACL of the non-existent or
non-extendable container. To improve UX, there is a need to pre-check
the availability of `SETEACL` operation.
Add boolean `precheck` flag to `set-eacl` cmd which reads the container
before the actual transaction formation. If flag is set, command fails
on non-extendable container ACL.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
If container listing cache on node's side is missing (for particular
owner), then updating it as a reaction to successful container creation
leads to potentially invalid cache value for a period of time equivalent
to cache TTL.
Immediately return from `ttlContainerLister.update` method if owner's
container list isn't cached.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
From now cache TTL can be parameterized in the `neofs-node` app using
`cache_ttl` config key. `disable_cache` value is no longer supported.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
In previous implementation storage node responded with the outdated
container list after successful creation/removal up until cache
invalidation due to TTL. In order to decrease the probability of
outdated responses node should update its cache on event receipts.
Implement `ttlContainerLister.update` method which actualizes cached
list of the owner's containers. Make node to call `update` method
on `PutSuccess`/`DeleteSuccess` notifications from the `Container`
contract.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
In previous implementation storage node responded with the removed
container up until cache invalidation due to TTL. In order to avoid
false-positive responses node should update its cache on `DeleteSuccess`
events.
Make node to call `handleRemoval` method of the container cache which
leads to subsequent `apistatus.ErrContainerNotFound` errors.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
In previous implementation failed requests to the Sidechain weren't
cached. It makes sense to cache errors along with the values in order to
decrease potential load spikes onto Sidechain nodes.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
There is a need to sync container-related caching mechanism with the
actual Sidechain changes. To do this, node should be able to listen
incoming notifications about container ops.
Define `PutSuccess` / `DeleteSuccess` notification event's parsers.
Subscribe to these events in node app. As initial implementation node
will log event receipts. Later handling is going to be practically
complicated.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
1. Move compression parameters to the `shard` section.
2. Allow to use multiple sub-storage components in the blobstor.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Define `--with-attr` flag of `container list` which makes the command to
request and print user attributes for each found element.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Define `--with-attr` flag of `container list-objects` which makes the
command to request and print user attributes for each object from the
container.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
We have the default value which is also printed in the help messages but any
call that does not specify that flag leads to an error.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
`Degraded` mode can be set by the administrator if needed.
Modifying operations in this mode can lead node into an inconsistent state
because metabase checks such as lock checking are not performed.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Do not check that a node indeed belongs to the container, because the
synchronization will fail in this case anyway.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Do not return backend type from the service for now, because memory
backend is expected to vanish.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
There is an error only if the flag is not defined, such errors should be
caught during debugging.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Do not use homomorphic hash in storage group for containers that have
`homomorphic_hashing_disabled` set to `true`.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Eventually more parameters will be supported (#1390) and after blobstor
configuration refactoring the output will certainly change. Implement
the simplest approach now.
Marshaling the result directly results in too ugly names and they cannot
be easily customized. Marshaling the results via `jsonpb` is better but
is not that flexible in terms of what we want to output.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
After recent changes in NeoFS SDK Go library session tokens aren't
embedded into `container.Container` and `eacl.Table` structures.
Group value, session token and signature in a structure for container
and eACL.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
The node does not support asynchronous object replication anymore, so it
does not need to have replicator worker, channel and `AddTask` function.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Core changes:
* avoid package-colliding variable naming
* avoid using pointers to IDs where unnecessary
* avoid using `idSDK` import alias pattern
* use `EncodeToString` for protocol string calculation and `String` for
printing
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
If the key can't be fetched, an error is always returned, so it makes
sense to fail the whole command inside of a `key.Get*()`.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
In previous implementation NeoFS CLI app used `network.Address.HostAddr`
as a server URI, which caused scheme loss since host address doesn't
contain it.
Rename `HostAddr` to `URIAddr` and make it to return URI address with
`grpcs` scheme if TLS is enabled. Make `TLSEnabled` unexported since it
was used to provide default `tls.Config` only (it is used by default in
SDK).
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Morph "NewEpoch" event handling was registered in a closure over
`addNewEpochNotificationHandler` func. That may lead to the data race:
if a shard was initialized before the event registration, everything works
as planned, but if registration was made earlier, it was not able to
include GC handlers since a shard has not called `eventChanInit` yet and,
therefore, it has not registered handler yet.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
In previous implementation `Container.Delete` operation caused local
node's cache invalidation (container itself, eACL and listings). Any
subsequent `Container.Get` operation reversed invalidation. Given the
low latency sensitivity of deleting a container, there is no need to
touch the cache. With this approach, all pending deletion operations on
the node via the NeoFS API protocol will be delayed by the cache TTL.
Do not call cache invalidation ops in `morphContainerWriter.Delete`.
Remove no longer needed `InvalidateContainerListByCID` and
`InvalidateContainer` methods.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Add worker pool to the listener to prevent blocking. It is used only for
notary notifications and new block events handling since it uses RPC
calls. That may lead to the deadlock state: neo-go cannot send RPC until
notification channel is read but notification channel cannot be read since
neo-go client cannot send RPC.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Updated client now supports subscription to chain notifications and RPC
switch between provided RPC endpoints.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Provide explicit argument to `sendCommitteeTx` signifying whether a tx
should try to use group signer.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
NEP-17 transfer method returns boolean value signifying if the operation
was successful. Fail the transaction if it was not.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Check the full file name instead of just prefix. Also, fix a bug where
a single missing wallet could lead to an incorrect size calculation.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
`Degraded` mode is set automatically after error counter is over the
threshold. `ReadOnly` mode can still be set by an administrator.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Move in-memory session storage to the separate directory of `storage`. It is
done for future support of different kind of session storages.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
The buffer size value is somewhat arbitrary and making in configurable
doesn't make much sense, given that we can't really restrict total resource
consumption in other places. `Copy` uses 32 KiB buffer by default, which
is not big. This approach is also more flexible as we can get rid of
buffer completely by implementing `ReaderFrom`, `WriterTo` interfaces.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
GracefulStop() may be blocked until all server-side streams
are finished. There is no control over such streams yet, so
application may be frozen in shutdown stage.
Naive solution is to add timeout for GracefulStop(). At this
point healthy connection will be finished and unhealthy
connections will be terminated by Stop().
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
Wrap engine with notifications writer (if configured so) to allow sending
notifications right after the object is saved in the local storage.
"Hot" notifications are sent for objects with the following tick epoch
values:
1. 0;
2. *current epoch*.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Make all epoch independent in reputation process. Do not reset any timers
related to reputation. Make it possible to finish iteration after the
unexpected `NewEpoch` event.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Implement `lock` command and add it to `object` section. The command
accepts container argument (string `cid.ID`) and list of locked objects
(string `oid.ID` list). From the provided input `LOCK` object is
constructed and stored using NeoFS API protocol.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Make `FormatValidator.ValidateContent` to verify payload of `LOCK`
objects. Pass locked objects to `Locker` interface. Require from
`Locker.Lock` to return `apistatus.IrregularObjectLock` error on a
corresponding condition.
Also add error return to `DeleteHandler.DeleteObjects` method. Require
from method to return `apistatus.ObjectLocked` error on a corresponding
condition. Adopt implementations.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
There is no need to switch between object types since `Type` implements
`fmt.Stringer`.
Replace swich-case in `printHeader` with `%s` format notation function.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Make all operations that related to `neofs-api-go` library be placed in `v2`
packages. They parse all v2-versioned structs info `neofs-sdk-go`
abstractions and pass them to the corresponding `acl`/`eacl` packages. `v2`
packages are the only packages that do import `neofs-api-go` library. `eacl`
and `acl` provide public functions that only accepts `sdk` structures.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Remove `Object` and `RawObject` types from `pkg/core/object` package.
Use `Object` type from NeoFS SDK Go library everywhere. Avoid using the
deprecated elements.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
It was broken since `initConfig` was made before every execution of the
command and flags have not been read by cobra yet, so it was impossible to
print config file path if `verbose` flag was set in command line not in
config file.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
After recent changes balance response contains contract precision.
Convert balance response to Fixed8. Use `fixedn.ToString` function to
print the converted value.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Currently have static priority of what key is used irregardless of
whether a flag was provided via CLI or in config. This makes it
impossible to override some of the config settings. While we could try
to check if the key is provided by CLI by binding CLI flag under to
viper under a different name the same problem would occur for config/environment
variables. Fixing all of this with current set of keys is too complicate.
In this commit we revert changes from #610 and use a single flag for all types of keys.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
- Update `neofs-sdk-go`:
v0.0.0-20211230072947-1fe37df88f80 => v0.0.0-20220113123743-7f3162110659
- Add client interface that duplicates SDK's client behaviour and new
`MultiAddressClient` interface that has method that iterates over wrapped
clients.
- Also start using simple client mode that does not require parsing statuses
outside the SDK library.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
For some data compression makes little sense, as it is already compressed.
This commit allows to leave such data unchanged based on `Content-Type`
attribute. Currently exact, prefix and suffix matching are supported.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
It is much more convenient to skip source creation.
Also fix some bugs:
1. `cryptoSource.Int63()` now returns number in [0, 1<<63) as required
by `rand.Source` interface.
2. Replace `cryptoSource.Uint63()` with `cryptoSource.Uint64` to allow
generate uint64 numbers directly (see rand.Source64 docs).
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
In previous implementation ACL server was the 1st (except metric server
in some cases) server in pipeline of Object service servers. This led to
the fact that errors of this handler could not be reduced to status
responses.
Nest object ACL server into signature and response servers to support
common response format.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
The updated version of the `NNS` contract now supports the third `data`
argument that may provide additional information.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
In notary disabled environment, approval of container creation with nice
name attribute takes much more additional GAS than other operations
(due to NNS invocation).
Morph library changes:
* add the ability to specify per-op fees using `StaticClient` options;
* add the ability to customize fee for `Put` operation with named
container in container morph client.
Inner Ring changes:
* add `fee.named_container_register` config value which specifies
additional GAS fee for the approvals of the named container
registrations;
* pass the config value to `WithCustomFeeForNamedPut` option of
container morph client.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
We have `subnet` contract in list, but it isn't currently deployed.
This commit skips missing NNS entries to handle such situation. In
future we may optimize this to be done in 1 round-trip.
As a nice side-effect, dump-hashes for notary-enabled environment works
even if notary is disabled -- it just prints zero hash for proxy
contract.
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Only `subnet create` command can generate notary requests.
Remove global `non-notary` flag. Add `notary` flag to `create` cmd.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Cobra commands don't call `PreRun` functions on parent by default. We
need to do it in `subnet` command of admin utility in order to inherit
viper bindings.
Add `inheritPreRun` function which makes sub-commands to call `PreRun`
functions before its own `PreRun`.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Use persistent flags on parent command in order to inherit flags in
sub-commands. Turn on notary mode of morph client in `subnet` command of
admin utility for notary environments.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Make `deployContracts` method to call `nnsRegisterDomain` in order to
register NNS domain for deployed contracts.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Make `nnsResolveHash` function to return declared error on `token not
found` fault exception. Catch this error in `deployContracts` method,
and switch to deployment if updating contract is missing.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Add `subnet` command which contains all subnet-related commands. Add
sub-commands:
* `create` for creation;
* `remove` for removal;
* `get` for reading;
* `admin` for admin management;
* `client` for client management.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Add `subnet` sub-section to `node` section of storage node config. Add
`entries` value which allows to enumerate subnets for entrance. Add
`exit_zero` value which allows to not enter zero subnet.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Define notification events, implement parsers. Add morph client of
Subnet contract. Listen, verify and approve events in Inner Ring app.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Upgrade NeoFS API Go library to version with status returns. Make all API
clients to pull out and return errors from failed statuses. Make signature
service to respond with status if client version supports it.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Add hash of the TX that generated notification
to neofs/netmap event structures. Adapt all
neofs/netmap wrapper calls to new structures.
Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
Rounding is done using the suffix boundary (i.e. floating point value
with `gb` suffix will return size which is an integer number of
megabytes).
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
Relay storage node doesn't exec local object operations, so it doesn't need
shard configuration.
Add `required` bool parameter to `engineconfig.IterateShards`. Make it to
panic if it is `true`, and immediately return otherwise. Pass `false` if
node is configured as relay in app (it also prevents panic).
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
There is a need to block execution of local object storage operations if
node is put into maintenance mode (resume if the node is taken out of
maintenance mode).
Call `BlockExecution` method if `ControlService.SetNetmapStatus` was called
with `MAINTENANCE` status. Call `ResumeExecution` if it was called with
another status.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Accept `maintenance` netmap status in `control set-status` command and
resolve it to `control.NetmapStatus_MAINTENANCE` value.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
All objects in NeoFS must have owner ID. In previous implementation Object
Delete service handler set owner ID from request session token. If removal
was executed w/o a session, object with tombstone was prepared incorrectly.
In order to fix this node should set its own ID and become an owner of the
tombstone object.
Extend `NetworkInfo` interface required by Object.Delete handler with
`LocalNodeID` method which returns `owner.ID` of the local node. Implement
the method on `networkState` component of storage node application which is
updated on each node state change in NeoFS network map. Set owner returned
by `LocalNodeID` call as tombstone object's owner in Delete handler.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
The client needs of the Reputation service are limited and change not often.
Interface changes of the client library should not affect the operation of
various service packages, if they do not change their requirements for
the provided functionality. To localize the use of the base client and
facilitate further support, an auxiliary package is implemented that will
only be used by the Reputation service.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
The client needs of the CLI application are limited and change not often.
Interface changes of the client library should not affect the operation of
various application packages, if they do not change their requirements for
the provided functionality. To localize the use of the base client and
facilitate further support, an auxiliary package is implemented that will
only be used by the CLI application.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
CLI `util locode info` command does not write operations. Opening a
`locodebolt.DB` instance in RW mode is redundant.
Provide `locodebolt.ReadOnly()` option to `locodebolt.DB` constructor in
order to create READ flock over BoltDB file.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
