public static async Task RemoveEventFromSubscriptionAsync(string accountId, string subscriptionId, string eventName, string eventScope)
{
if (_redisClient == null)
{
_redisClient = await Singletons.GetRedisClientAsync();
}
// convert the event scope to all lower-case characters
eventScope = eventScope.ToLowerInvariant();
// sanity-check: eventScope must belong to the account; if the scope is null or empty then set it to scope to the account itself
if (string.IsNullOrWhiteSpace(accountId) == false)
{
// accountId is present
string baseAccountScope = "/accounts/" + accountId;
if (eventScope != null)
{
if (eventScope.IndexOf(baseAccountScope) != 0)
{
return; // return false;
}
}
else
{
eventScope = baseAccountScope;
}
}
// NOTE: we do this entire operation in one atomic Lua script to ensure that we all the collections we touch stay intact
// NOTE: if the subscription is already subscribed to this event...then this Lua function will effectively have no effect
// create our script-builder object placeholders
StringBuilder luaBuilder;
List <string> arguments;
int iArgument;
List <string> keys;
int RESULT_SUCCESS = 0;
// generate Lua script
luaBuilder = new StringBuilder();
arguments = new List <string>();
iArgument = 1;
//
luaBuilder.Append("redis.call(\"SREM\", KEYS[1], ARGV[" + iArgument.ToString() + "])\n");
arguments.Add(accountId + REDIS_SLASH + subscriptionId);
iArgument++;
//
luaBuilder.Append("redis.call(\"SREM\", KEYS[2], ARGV[" + iArgument.ToString() + "])\n");
arguments.Add(eventName + "[scope@" + eventScope + "]");
iArgument++;
//
luaBuilder.Append("return " + RESULT_SUCCESS.ToString() + "\n");
keys = new List <string>();
keys.Add(REDIS_PREFIX_EVENT + REDIS_PREFIX_SEPARATOR + eventName + "[scope@" + eventScope + "]" + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_SUBSCRIPTIONS);
keys.Add(REDIS_PREFIX_SUBSCRIPTION + REDIS_PREFIX_SEPARATOR + accountId + REDIS_SLASH + subscriptionId + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_EVENTS);
long luaResult = await _redisClient.EvalAsync <string, string, long>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
}
public static async Task <Subscription> LoadSubscriptionAsync(string accountId, string subscriptionId)
{
if (_redisClient == null)
{
_redisClient = await Singletons.GetRedisClientAsync();
}
string fullyQualifiedSubscriptionKey = REDIS_PREFIX_SUBSCRIPTION + REDIS_PREFIX_SEPARATOR + (accountId != null ? accountId.ToLowerInvariant() : REDIS_ASTERISK) + REDIS_SLASH + subscriptionId.ToLowerInvariant();
bool subscriptionExists = (await _redisClient.ExistsAsync(new string[] { fullyQualifiedSubscriptionKey }) > 0);
if (subscriptionExists)
{
Dictionary <string, string> subscriptionDictionary = await _redisClient.HashGetAllASync <string, string, string>(fullyQualifiedSubscriptionKey);
// extract serverId from subscriptionId
string serverId = ParsingHelper.ExtractServerDetailsFromAccountServerIdIdentifier(subscriptionId).Value.ToServerTypeServerIdIdentifierString();
//
string clientId = subscriptionDictionary.ContainsKey("client-id") ? subscriptionDictionary["client-id"] : null;
//
string userId = subscriptionDictionary.ContainsKey("user-id") ? subscriptionDictionary["user-id"] : null;
Subscription resultSubscription = new Subscription();
// account-id
resultSubscription._accountId = accountId;
// subscription-id
resultSubscription._subscriptionId = subscriptionId;
// server-id
resultSubscription._serverId = serverId;
// client-id
resultSubscription._clientId = clientId;
// user-id
resultSubscription._userId = userId;
return(resultSubscription);
}
// subscription (or its owner) could not be found
return(null);
}
public static async Task DispatchEventsAsync()
{
// connect to Redis
_redisClient = await Singletons.CreateNewRedisClientAsync();
// create a list of all eventPriorityKeys
List <string> eventPriorityKeyList = new List <string>();
for (int i = 7; i >= 0; i--)
{
eventPriorityKeyList.Add("service:*/event#incoming-notifications" + i.ToString());
}
;
string[] eventPriorityKeys = eventPriorityKeyList.ToArray();
while (true)
{
// wait for a new event to be enqueued; then dequeue it (always dequeuing from the highest-priority event queue first)
var queuedEvent = await _redisClient.ListPopLeftBlockingAsync <string, byte[]>(eventPriorityKeys, null);
// retrieve our event priority
string keyName = queuedEvent.Key;
int priority = int.Parse(keyName.Substring("service:*/event#incoming-notifications".Length));
// parse out the event creation timestamp and the resource path of the event source
// NOTE: the event value is: [8-byte unix timestamp in milliseconds][resourceuri#eventname][1 byte of 0x00][event json]
byte[] eventAsBytes = queuedEvent.Value;
long createdTimestamp = BitConverter.ToInt64(eventAsBytes, 0);
int resourceStartPos = 8;
int resourceLength = 0;
for (int i = resourceStartPos; i < eventAsBytes.Length; i++)
{
if (eventAsBytes[i] == 0x00)
{
resourceLength = i - resourceStartPos;
}
}
string resourcePathAndEvent = Encoding.UTF8.GetString(eventAsBytes, resourceStartPos, resourceLength);
int jsonStartPos = resourceStartPos + resourceLength + 1;
string jsonEncodedEvent = Encoding.UTF8.GetString(eventAsBytes, jsonStartPos, eventAsBytes.Length - jsonStartPos);
// split the resourcePath and its eventName
if (resourcePathAndEvent.IndexOf("#") < 0)
{
continue; // safety check: if the resource is not validly formatted, skip to the next event
}
string resourcePath = resourcePathAndEvent.Substring(0, resourcePathAndEvent.IndexOf("#"));
string eventName = resourcePathAndEvent.Substring(resourcePathAndEvent.IndexOf("#") + 1);
// calculate the root resource for the account (to make sure we don't "bubble" the event handler any higher than the account's root)
if (resourcePath.IndexOf("/accounts/") != 0)
{
continue; // sanity and security check: resource must start with the accounts tag
}
if (resourcePath.Length <= "/accounts/".Length)
{
continue; // sanity and security check: resource must contain an account id
}
//int accountStartPos = "/accounts/".Length;
//int rootAccountResourcePos = resourcePath.IndexOf("/", accountStartPos);
//if (rootAccountResourcePos < 0) continue; // sanity and security check: resource must contain an account id
// find all subscriptions which are subscribed to receive this event
List <string> listeningSubscriptions = new List <string>();
List <string> resourcePathList = new List <string>();
string tempResourcePath = resourcePath;
// bubble up the resource tree, to find all parent resources which could also be subscribed to this event
while (tempResourcePath.Length > "/accounts/".Length)
{
resourcePathList.Add(tempResourcePath);
int parentPathElementPos = tempResourcePath.LastIndexOf('/' /*, tempResourcePath.Length - 2 */);
tempResourcePath = tempResourcePath.Substring(0, parentPathElementPos);
}
// search all event-subscription keys to determine which subscriptions are subscribed to receive this event
foreach (string resourcePathElement in resourcePathList)
{
List <string> subscriptionIds = await _redisClient.SetMembersAsync <string, string>("event:" + eventName + "[scope@" + resourcePathElement + "]" + "#" + "subscriptions");
foreach (string subscriptionId in subscriptionIds)
{
//string subscriptionId = subscriptionIdAndTag.Substring(0, subscriptionId.IndexOf(" "));
//string tag = subscriptionId.Substring(subscriptionIdAndTag.IndexOf(" ") + 1);
// establish our subscription's base key
string subscriptionBaseKey = "subscription:" + subscriptionId;
long currentTimestamp;
long subMillisecondIndex;
StringBuilder luaBuilder;
List <string> arguments;
int iArgument;
List <string> keys;
// NOTE: we put this code in a loop for the rare-to-impossible case that we experience more than 1 million events/subscription/millisecond
while (true)
{
// prefix the current timestamp to the event json
currentTimestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
/* now, we make sure that the current timestamp is unique:
* - the following lua function passes our UnixTimeMilliseconds timestamp to Redis,
* - then compares the timestamp to "subscription:account_id/subscription_id" field "last-incoming-notification-time"
* - if the timestamp is different than the existing timestamp: stores the new timestamp in memory,
* sets the field "last-incoming-notification-time-incrementer" to 0 and returns that "incrementer" value "0".
* - if the timestamp is the same then we instead increment the field "last-incoming-notification-time-incrementer" and return its new value.
*/
// NOTE: this function is written in Lua because this operation must happen atomically
// if the subscription cannot be found, the function immediately returns 0 (and does not inadvertently recreate the key)
luaBuilder = new StringBuilder();
arguments = new List <string>();
iArgument = 1;
/* switch replication to "commands replication" instead of "script replication" for this script (required because we obtain a non-static piece of data, the timestamp, in this script and sometimes then write it out as data */
// NOTE: this feature requires Redis 3.2.0 or newer
luaBuilder.Append("redis.replicate_commands()\n");
//
// check and make sure that the subscription still exists (for that edge case) and, if not then return "-1" as error.
luaBuilder.Append("if redis.call(\"EXISTS\", KEYS[1]) == 0 then\n");
luaBuilder.Append(" return {-1, -1}\n");
luaBuilder.Append("end\n");
luaBuilder.Append("local currentTime = tonumber(ARGV[" + iArgument.ToString() + "])\n");
arguments.Add(currentTimestamp.ToString());
iArgument++;
luaBuilder.Append("local currentTimeArray = redis.call(\"TIME\")\n");
luaBuilder.Append("local currentTime = (currentTimeArray[1] * 1000) + math.floor(currentTimeArray[2] / 1000)\n");
//
luaBuilder.Append("local returnValue = 0\n");
// get current timestamp
luaBuilder.Append("local previousTime = tonumber(redis.call(\"HGET\", KEYS[1], \"last-incoming-notification-time\"))\n");
// if the currentTime is newer than the previousTime, then overwrite "last-incoming-notification-time", etc.
luaBuilder.Append("if (previousTime == false) or (currentTime > previousTime) then\n");
luaBuilder.Append(" redis.call(\"HSET\", KEYS[1], \"last-incoming-notification-time\", currentTime)\n");
luaBuilder.Append(" redis.call(\"HSET\", KEYS[1], \"last-incoming-notification-time-incrementer\", 0)\n");
luaBuilder.Append(" returnValue = 0\n");
luaBuilder.Append("else\n");
luaBuilder.Append(" returnValue = redis.call(\"HINCRBY\", KEYS[1], \"last-incoming-notification-time-incrementer\", 1)\n");
luaBuilder.Append("end\n");
// return our returnValue (the incrementer)
luaBuilder.Append("return {currentTime, returnValue}\n");
keys = new List <string>();
keys.Add(subscriptionBaseKey);
// NOTE: if the returned incrementer value is >= 1 million, it's too large and we need to wait until the next millisecond and try again.
// (practically speaking, anywhere close to 1 million events per millisecond should never ever ever happen in our software)
object[] returnObjects = await _redisClient.EvalAsync <string, string, object[]>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
currentTimestamp = (long)returnObjects[0];
subMillisecondIndex = (long)returnObjects[1];
if (subMillisecondIndex < 1000000)
{
break;
}
}
byte[] currentTimeAsByteArray = BitConverter.GetBytes((currentTimestamp * 1000000) + subMillisecondIndex);
byte[] jsonAsByteArray = Encoding.UTF8.GetBytes(jsonEncodedEvent);
byte[] subscriptionEventValueAsByteArray = new byte[currentTimeAsByteArray.Length + jsonAsByteArray.Length];
Array.Copy(currentTimeAsByteArray, 0, subscriptionEventValueAsByteArray, 0, currentTimeAsByteArray.Length);
Array.Copy(jsonAsByteArray, 0, subscriptionEventValueAsByteArray, currentTimeAsByteArray.Length, jsonAsByteArray.Length);
// now queue this event into each subscription's respective incoming notification queue, check for the current waitkey and
// if the waikey is empty we should add a dummy value so that the subscriber dequeues the new incoming event
//
// NOTE: this function is written in Lua because this operation must happen atomically
// if the subscription cannot be found, the function immediately fails so that the event key is not inadvertenly created
luaBuilder = new StringBuilder();
List <byte[]> argumentsAsByteArrays = new List <byte[]>();
iArgument = 1;
// check and make sure that the subscription still exists (for that edge case) and, if not then return "-1" as error.
luaBuilder.Append("if redis.call(\"EXISTS\", KEYS[1]) == 0 then\n");
luaBuilder.Append(" return {-1, -1}\n"); // return -1 if the subscription doesn't exist (so we can short-circuit our verification logic
luaBuilder.Append("end\n");
// add the event to the appropriate incoming event queue
luaBuilder.Append("local addCount = redis.call(\"ZADD\", KEYS[2], ARGV[" + iArgument.ToString() + "], ARGV[" + (iArgument + 1).ToString() + "])\n");
argumentsAsByteArrays.Add(_redisClient.Encoding.GetBytes(createdTimestamp.ToString()));
iArgument++;
argumentsAsByteArrays.Add(subscriptionEventValueAsByteArray);
iArgument++;
// check for the current subscription waitkey; if a waitkey exists and is empty then add a dummy value so that it dequeues the new incoming event
luaBuilder.Append("local connectionId = redis.call(\"HGET\", KEYS[1], \"connection-id\")\n");
luaBuilder.Append("if connectionId == false then\n"); // null values are if-evaluated as false; we'll change this to -1 to mean "no connection"
luaBuilder.Append(" connectionId = -1\n");
luaBuilder.Append("end\n");
luaBuilder.Append("return {addCount, tonumber(connectionId)}\n");
keys = new List <string>();
keys.Add(subscriptionBaseKey);
keys.Add(subscriptionBaseKey + "#incoming-notifications" + priority.ToString());
object[] addCountAndConnectionIdArray = await _redisClient.EvalAsync <string, byte[], object[]>(luaBuilder.ToString(), keys.ToArray(), argumentsAsByteArrays.ToArray()).ConfigureAwait(false);
//object[] addCountAndConnectionIdArray = (object[])addCountAndConnectionId;
bool subscriptionAndWaitKeyExist = true;
var addCount = (long)addCountAndConnectionIdArray[0];
if (addCount == -1)
{
// this is no subscription
subscriptionAndWaitKeyExist = false;
}
else if (addCount == 0)
{
// we failed to add the event; error!
}
long connectionId = (long)addCountAndConnectionIdArray[1];
if (connectionId == -1)
{
// there is no connectionId
subscriptionAndWaitKeyExist = false;
}
else
{
connectionId = (long)addCountAndConnectionIdArray[1];
}
// if our subscription exists and a wait key exists, check to see if the wait key has any elements; if not then add one
if (subscriptionAndWaitKeyExist)
{
luaBuilder = new StringBuilder();
arguments = new List <string>();
iArgument = 1;
//
luaBuilder.Append("local connectionId = ARGV[" + iArgument.ToString() + "]\n");
arguments.Add(connectionId.ToString());
iArgument++;
// check to make sure the connection-id has not changed
luaBuilder.Append("local verifyConnectionId = redis.call(\"HGET\", KEYS[1], ARGV[" + iArgument.ToString() + "])\n");
arguments.Add("connection-id");
iArgument++;
luaBuilder.Append("if connectionId == verifyConnectionId then\n");
// if the connection matches, then check to see if the wait key exists; if the wait key does not exist, push it a blank element
luaBuilder.Append(" if redis.call(\"EXISTS\", KEYS[2]) == 0 then\n");
luaBuilder.Append(" redis.call(\"RPUSH\", KEYS[2], ARGV[" + iArgument.ToString() + "])\n");
arguments.Add("");
iArgument++;
luaBuilder.Append(" end\n");
luaBuilder.Append("end\n");
keys = new List <string>();
keys.Add(subscriptionBaseKey);
keys.Add(subscriptionBaseKey + "#waitkey-" + connectionId.ToString());
await _redisClient.EvalAsync <string, string, object>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
}
}
}
}
}
public async Task DeleteSubscriptionAsync()
{
if (_redisClient == null)
{
_redisClient = await Singletons.GetRedisClientAsync();
}
//int RESULT_KEY_CONFLICT = -1;
// generate Lua script (which we will use to commit all changes--or the new record--in an atomic transaction)
StringBuilder luaBuilder = new StringBuilder();
List <string> arguments = new List <string>();
int iArgument = 1;
// if the subscription has already been deleted, return success
luaBuilder.Append(
"if redis.call(\"EXISTS\", KEYS[1]) == 0 then\n" +
" return {1, \"\"}\n" +
"end\n");
// read the connection-id from the subscription; we will delete this connection's waitkey in a follow-up call
luaBuilder.Append("local connection_id = redis.call(\"HGET\", KEYS[1], \"connection-id\")\n");
// delete the subscription itself
luaBuilder.Append("redis.call(\"DEL\", KEYS[1])\n");
// delete the subscription's event registrations
luaBuilder.Append("redis.call(\"DEL\", KEYS[2])\n");
// delete the subscription's notifications list
luaBuilder.Append("redis.call(\"DEL\", KEYS[3])\n");
// delete the subscription's incoming notifications priority queues
for (int iPriority = 0; iPriority < 8; iPriority++)
{
luaBuilder.Append("redis.call(\"DEL\", KEYS[" + (4 + iPriority).ToString() + "])\n");
}
//
luaBuilder.Append("return {1, connection-id}\n");
object[] luaResult = null;
List <string> keys = new List <string>();
string subscriptionKeyBase = REDIS_PREFIX_SUBSCRIPTION + REDIS_PREFIX_SEPARATOR + (_accountId != null ? _accountId : REDIS_ASTERISK) + REDIS_SLASH + _subscriptionId;;
keys.Add(subscriptionKeyBase);
keys.Add(subscriptionKeyBase + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_EVENTS);
keys.Add(subscriptionKeyBase + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_NOTIFICATIONS);
for (int iPriority = 0; iPriority < 8; iPriority++)
{
keys.Add(subscriptionKeyBase + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_INCOMING_NOTIFICATIONS + iPriority.ToString());
}
luaResult = await _redisClient.EvalAsync <string, string, object[]>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
long?resultValue = (luaResult != null && luaResult.Length >= 1 ? (long)luaResult[0] : (long?)null);
if (resultValue != null && resultValue == 1)
{
if (luaResult.Length >= 2 && string.IsNullOrWhiteSpace((string)luaResult[1]) == false)
{
string oldConnectionId = (string)luaResult[1];
// success; dispose of the current connection's waitkey, if one existed (by pushing a dummy value into it and then expiring it in ten seconds)
string oldConnectionWaitKey = subscriptionKeyBase + "#waitkey-" + oldConnectionId.ToString();
// NOTE: we push a value into the key so that the previous connection will trigger, see that it's not the current connection, and terminate
await _redisClient.ListPushRightAsync(oldConnectionWaitKey, new string[] { string.Empty });
// NOTE: we also put a timeout on the previous connection's waitkey so that, if no connection was actively listening, the key will be auto-deleted
// NOTE: we use a fixed expiration of ten seconds. We actually do not need any timeout--but we want to make sure that a caller who is currently blocked gets a chance to
// fetch the empty value we just enqueued...while automatically cleaning up afterwards. ten seconds should be far more than enough time for a previous caller to
// start blocking on its waitkey and dequeue the empty value we pushed into its queue.
await _redisClient.ExpireAsync(oldConnectionWaitKey, 10);
}
// finally, reset our server-assigned values
_subscriptionId = null;
}
else
{
// unknown error
throw new Exception("Critical Redis error!");
}
}
public async Task SaveSubscriptionAsync()
{
if (_redisClient == null)
{
_redisClient = await Singletons.GetRedisClientAsync();
}
// create our script-builder object placeholders; we re-use these below
StringBuilder luaBuilder;
List <string> arguments;
int iArgument;
List <string> keys;
/* if the subscription is a new subscription, allocate the subscription-id now */
if (_objectIsNew)
{
// allocate a new subscriptionId for this subscription on this account; we use an atomic lua script to do this so that the first subscriptionId is zero for consistency (since HINCRBY would set the first entry to one)
// NOTE: we allocate the subscriptionId in a unique script because Lua-on-Redis requires that we pass all keys pre-built--so we can't allocate the subscriptionId and create its key(s) in the same script
// generate Lua script
luaBuilder = new StringBuilder();
arguments = new List <string>();
iArgument = 1;
//
// default our subscription_id to -1 (as a marker indicating that the subscription_id is not valid)
luaBuilder.Append("local subscription_id = -1\n");
// create or increment the last-subscription-id for this account
luaBuilder.Append(
" if redis.call(\"HEXISTS\", KEYS[1], \"last-subscription-id\") == 0 then\n" +
// if no subscription has been added to this account for this server_id, set the subscription_id to zero and store it.
" redis.call(\"HSET\", KEYS[1], \"last-subscription-id\", 0)\n" +
" subscription_id = 0\n" +
" else\n" +
// otherwise...increment the last-subscription-id and return the new value as subscription_id.
" subscription_id = redis.call(\"HINCRBY\", KEYS[1], \"last-subscription-id\", 1)\n" +
" end\n" +
" return subscription_id\n"
);
//
keys = new List <string>();
keys.Add(REDIS_PREFIX_EVENT_SERVICE + REDIS_PREFIX_SEPARATOR + _accountId + REDIS_SLASH + _serverId);
long newSubscriptionLuaResult = await _redisClient.EvalAsync <string, string, long>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
//
// obtain the subscription_id (if subscription_id == -1 then we had an error)
if (newSubscriptionLuaResult >= 0)
{
_subscriptionId = _serverId + "-" + newSubscriptionLuaResult.ToString();
}
else
{
// subscriptionId could not be allocated
throw new Exception("Critical Redis error!");
}
}
int RESULT_SUCCESS = 0;
int RESULT_KEY_CONFLICT = -1;
int RESULT_DATA_CORRUPTION = -2;
// generate Lua script (which we will use to commit all changes--or the new record--in an atomic transaction)
luaBuilder = new StringBuilder();
arguments = new List <string>();
iArgument = 1;
if (_objectIsNew)
{
// for new subscriptions: if a subscription with this accountId+'/'+subscriptionId already exists, return RESULT_KEY_CONFLICT.
luaBuilder.Append(
"if redis.call(\"EXISTS\", KEYS[1]) == 1 then\n" +
" return " + RESULT_KEY_CONFLICT.ToString() + "\n" +
"end\n");
}
//
luaBuilder.Append("redis.call(\"HSET\", KEYS[1], \"client-id\", ARGV[" + iArgument.ToString() + "])\n");
arguments.Add(_clientId);
iArgument++;
//
if (_userId != null)
{
luaBuilder.Append("redis.call(\"HSET\", KEYS[1], \"user-id\", ARGV[" + iArgument.ToString() + "])\n");
arguments.Add(_userId);
iArgument++;
}
//
luaBuilder.Append("return " + RESULT_SUCCESS.ToString() + "\n"); //
keys = new List <string>();
string subscriptionKeyBase = REDIS_PREFIX_SUBSCRIPTION + REDIS_PREFIX_SEPARATOR + (_accountId != null ? _accountId : REDIS_ASTERISK) + REDIS_SLASH + _subscriptionId;
keys.Add(subscriptionKeyBase);
long luaResult = await _redisClient.EvalAsync <string, string, long>(luaBuilder.ToString(), keys.ToArray(), arguments.ToArray()).ConfigureAwait(false);
if (luaResult == RESULT_SUCCESS)
{
// success
// add the subscription to the set of all subscriptions on this fullServerId
string subscriptionsSetKey = REDIS_PREFIX_EVENT_SERVICE + REDIS_PREFIX_SEPARATOR + (_accountId != null ? _accountId : REDIS_ASTERISK) + REDIS_SLASH + _serverId + REDIS_SUFFIX_SEPARATOR + REDIS_SUFFIX_SUBSCRIPTIONS;
await _redisClient.SetAddAsync(subscriptionsSetKey, new string[] { _subscriptionId });
}
else if (luaResult == RESULT_KEY_CONFLICT)
{
// key name conflict
// TODO: consider returning an error to the caller
}
else if (luaResult == RESULT_DATA_CORRUPTION)
{
// data corruption
throw new Exception("Critical Redis error!");
}
else
{
// unknown error
throw new Exception("Critical Redis error!");
}
}
