public override async Task <bool> DownloadImage(int width, string imageUrl, string outputFilePath)
{
if (string.IsNullOrEmpty(imageUrl))
{
return(false);
}
_imageBucket.Consume(1);
return(await DownloadImageInternal($"https://image.tmdb.org/t/p/w{width}/{imageUrl}", outputFilePath));
}
static void Main(string[] args)
{
// Create a token bucket with a capacity of 1 token that refills at a fixed interval of 1 token/sec.
ITokenBucket bucket = TokenBuckets.Construct()
.WithCapacity(100)
.WithFixedIntervalRefillStrategy(100, TimeSpan.FromSeconds(1))
.Build();
// ...
while (true)
{
// Consume a token from the token bucket. If a token is not available this method will block until
// the refill strategy adds one to the bucket.
bucket.Consume(1);
Poll();
}
}
private async Task <string> Fetch(string url)
{
var cacheKey = $"{CachePrefix}:{url}";
{
var cachedContent = await CachingService.GetStringAsync(cacheKey);
if (!string.IsNullOrEmpty(cachedContent))
{
return(cachedContent);
}
}
_bucket.Consume(1);
var content = await FetchInternal(cacheKey, url);
if (string.IsNullOrEmpty(content) || content.StartsWith("{\"status_code\":25"))
{
return(await Fetch(url));
}
return(content);
}
/// <summary>
/// Provides an overload of <see cref="ITokenBucket.Consume"/> that accepts a <see cref="TimeSpan"/> timeout
/// </summary>
public static void Consume(this ITokenBucket bucket, long tokens, TimeSpan timeout)
{
bucket.Consume(tokens, (long)timeout.TotalMilliseconds);
}