public void SelectorsRoundtrip()
{
var selectors = Enumerable.Range(0, 3).Select(_ => Selector.Random()).ToList();
var redisValues = _serializer.ToRedisValues(selectors);
var roundtrippedValues = _serializer.AsSelectors(redisValues);
Assert.Equal(selectors, roundtrippedValues);
}
private async Task <Result <Selector[]> > GetOrAddSelectorsAsync(
Context context,
Fingerprint weakFingerprint,
Func <Fingerprint, Task <Result <Selector[]> > > getFunc,
CancellationToken cancellationToken)
{
try
{
var cacheKey = _redisSerializer.ToRedisKey(weakFingerprint);
RedisValue[] cacheSelectors;
Stopwatch stopwatch = Stopwatch.StartNew();
try
{
_cacheTracer.GetDistributedSelectorsStart(context);
cacheSelectors = await GetSetMembersWithExpiryBumpAsync(context, cacheKey);
}
finally
{
_cacheTracer.GetDistributedSelectorsStop(context, stopwatch.Elapsed);
}
if (cacheSelectors.Length == 0)
{
_cacheTracer.RecordSelectorsFetchedFromBackingStore(context, weakFingerprint);
Result <Selector[]> selectorResults = await getFunc(weakFingerprint).ConfigureAwait(false);
if (!selectorResults || selectorResults.Value.Length == 0)
{
// Redis throws an error if set add is called without any values. Also, undefined keys are treated as empty sets.
// So currently skip trying to cache GetSelectors returning empty.
// If needed, we need to create a sentinel value to denote an known empty set v/s undefined.
return(selectorResults);
}
{
var selectors = selectorResults.Value;
var cacheValues = _redisSerializer.ToRedisValues(selectors);
stopwatch = Stopwatch.StartNew();
try
{
_cacheTracer.AddSelectorsStart(context);
var addedCount = await AddSetMembersWithExpiryBumpAsync(context, cacheKey, cacheValues);
if (cacheValues.Length != addedCount)
{
_tracer.Warning(context, $"Expected to add {cacheValues.Length} members but actually added {addedCount}.");
}
_tracer.Debug(context, $"Added redis cache entry for {weakFingerprint}: {selectors.Length} selectors.");
}
finally
{
_cacheTracer.AddSelectorsStop(context, stopwatch.Elapsed);
}
}
return(selectorResults);
}
else
{
Selector[] result = _redisSerializer.AsSelectors(cacheSelectors).ToArray();
_cacheTracer.RecordSelectorsFetchedDistributed(context, weakFingerprint, result.Length);
return(result);
}
}
catch (Exception ex)
{
return(Result.FromException <Selector[]>(ex));
}
}