These race conditions originate from the mock database storing and
returning pointers, rather than returning a copy.
Observed on Travis:
WARNING: DATA RACE
Read at 0x00c0003222b8 by goroutine 149:
github.com/lightningnetwork/lnd/watchtower/wtclient.(*sessionQueue).drainBackups()
/home/runner/work/lnd/lnd/watchtower/wtclient/session_queue.go:288 +0xed
github.com/lightningnetwork/lnd/watchtower/wtclient.(*sessionQueue).sessionManager()
/home/runner/work/lnd/lnd/watchtower/wtclient/session_queue.go:281 +0x450
Previous write at 0x00c0003222b8 by goroutine 93:
github.com/lightningnetwork/lnd/watchtower/wtclient.getClientSessions()
/home/runner/work/lnd/lnd/watchtower/wtclient/client.go:365 +0x24f
github.com/lightningnetwork/lnd/watchtower/wtclient.(*TowerClient).handleNewTower()
/home/runner/work/lnd/lnd/watchtower/wtclient/client.go:1063 +0x23e
github.com/lightningnetwork/lnd/watchtower/wtclient.(*TowerClient).backupDispatcher()
/home/runner/work/lnd/lnd/watchtower/wtclient/client.go:784 +0x10b9
The logger string used to identify the wtclient and wtclientrpc loggers
was the same, leading to being unable to modify the log level of the
wtclient logger as it would be overwritten with the wtclientrpc's one.
To simplify things, we decide to use the existing RPC logger for
wtclientrpc.
With two new callbacks we allow processes that use lnd as a library
to register additional gRPC and REST subservers to the main server
instances that lnd creates.
If the main package is used as a library, we don't want it to
register interrupt signals itself. Rather we want to pass in the
shutdown channel manually. We do this in the cmd now.
Variables related to the default configuration file location are
needed if the config parsing is happening externally. We export them
so they don't need to be copied to projects that use lnd as a library.
To allow external configuration parsing and validation, this commit
exports the function that checks a configuration for sanity.
Also because we touch the code, we need to fix all linter errors.
The continue-on-error was added to make sure the log files of the
failed itests would always be uploaded. But this has the side effect
of marking the whole job successful, even if the itest job itself
failed. The failure condition in the log file steps already solve
that, so the continue-on-error is not needed anymore.
