set log level of some messages to info to have more visibility of the… …

… errors; improve log messages and code comments (NO LOGIC CHANGES)

try refreshing lock TTL well before TTL expiration

adjust the retry strategy for more sanity when trying to obtain the l… …

…ock by a passive/undefined pod

try immediate lock reacquisition if lock refresh failed

add retry backoff to locker.Obtain() to avoid a retry loop; rename va… …

…riable

add nil check before trying to refresh a lock

rename ticker t to refresh

improvements for readability

improve backoff interval and comment

improve/add comments; implement safeguard when lock.TTL() returns an … …

…error

decrease log level for most logs to debug; enforce minimum refresh ti… …

…me after lock acquisition

DEBUG: add Stefan to log messages for testing

replace *redislock.Client by an interface, that is, LockClient to all… …

…ow for dependency injection also with a mock redis lock client

create mocks for redislock.Client and redislock.Lock

remove m.Called() from Obtain()

add some more log lines

add some more log lines

add some more log lines

add some more log lines

call lock.TTL() with a timeout context

pass redis client instead of redislock client to NewActivePassive()

delete lock and redislock mocks

check for lock==nil before calling lock.TTL()

do lock operations only if Redis is reachable

add check for lock key existence to prevent interface {} conversion e… …

…rror when trying to get the TTL from the lock

recover from panic in lock.TTL() and become undefined in this case