public static string Process(MiniRedisStorage storage, string command)
{
var parameters = new Regex(@"\s\s+")
.Replace(command, " ")
.Split(" ");
if (parameters.Length == 0)
{
throw new ArgumentException("Command is not specified");
}
const string nil = "(nil)";
var cmd = parameters[0];
return(cmd.ToUpperInvariant() switch
{
"SET" => (storage.Set(parameters) ?? nil),
"GET" => (storage.Get(parameters) ?? nil),
"DEL" => storage.Del(parameters),
"DBSIZE" => storage.DbSize(parameters),
"INCR" => storage.Incr(parameters),
"ZADD" => storage.ZAdd(parameters),
"ZCARD" => storage.ZCard(parameters),
"ZRANK" => (storage.ZRank(parameters) ?? nil),
"ZRANGE" => storage.ZRange(parameters) ?? nil,
_ => throw new ArgumentException($"Could not recognize command '{cmd}'")
});
public static string ZAdd(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsAtLeast(parameters, 3);
var key = parameters[1];
int added = 0;
for (int i = 2; i < parameters.Length; i += 2)
{
if (!double.TryParse(parameters[i], out var score))
{
throw new ArgumentException($"Unable to parse score parameter: {score}");
}
if (i + 1 >= parameters.Length)
{
throw new ArgumentException($"Unable to find value for score {score}");
}
var value = parameters[i + 1];
added += storage.Add(key, score, value);
}
return(added.ToString());
}
public static string DbSize(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 1);
return(storage
.Size
.ToString());
}
public static string ZCard(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 2);
var key = parameters[1];
return(storage.GetNumberOfElements(key).ToString());
}
public static string Incr(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 2);
var key = parameters[1];
return(storage.Increment(key));
}
public static string ZRank(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 3);
var key = parameters[1];
var value = parameters[2];
var rank = storage.GetRank(key, value);
return(rank?.ToString());
}
public static string ZRange(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 4);
var key = parameters[1];
if (!int.TryParse(parameters[2], out var from))
{
throw new ArgumentException($"Unable to parse from parameter: {parameters[2]}");
}
if (!int.TryParse(parameters[3], out var to))
{
throw new ArgumentException($"Unable to parse to parameter: {parameters[3]}");
}
var result = storage.GetRange(key, from, to);
return(result == null ? null : string.Join(Environment.NewLine, result));
}
public static string Set(this MiniRedisStorage storage, string[] parameters)
{
AssertLengthIsExactly(parameters, 3, 4);
if (parameters.Length == 3)
{
return(storage.Set(parameters[1], parameters[2], null));
}
var secondsParam = parameters[3];
if (!int.TryParse(secondsParam, out var seconds))
{
throw new ArgumentException($"Unable to parse {secondsParam}, number of seconds was expected");
}
var key = parameters[1];
var value = parameters[2];
return(storage.Set(key, value, seconds));
}
public MiniRedis()
{
_storage = new MiniRedisStorage();
}