Merge pull request #105 from geffzhang/develop

I've applied Ocelot to the product，bug fixed

src/Ocelot/Configuration/Validator/FileConfigurationValidator.cs

@@ -28,6 +28,12 @@ namespace Ocelot.Configuration.Validator
 
             result = CheckForReRoutesContainingDownstreamSchemeInDownstreamPathTemplate(configuration);
 
+            if (result.IsError)
+            {
+                return new OkResponse<ConfigurationValidationResult>(result);
+            }
+            result = CheckForReRoutesRateLimitOptions(configuration);
+
             if (result.IsError)
             {
                 return new OkResponse<ConfigurationValidationResult>(result);
@@ -111,5 +117,35 @@ namespace Ocelot.Configuration.Validator
 
             return new ConfigurationValidationResult(true, errors);
         }
+
+        private ConfigurationValidationResult CheckForReRoutesRateLimitOptions(FileConfiguration configuration)
+        {
+            var errors = new List<Error>();
+
+            foreach (var reRoute in configuration.ReRoutes)
+            {
+                if (reRoute.RateLimitOptions.EnableRateLimiting)
+                {
+                    if (!IsValidPeriod(reRoute))
+                    {
+                        errors.Add(new RateLimitOptionsValidationError($"{reRoute.RateLimitOptions.Period} not contains scheme"));
+                    }
+                }
+            }
+
+            if (errors.Any())
+            {
+                return new ConfigurationValidationResult(true, errors);
+            }
+
+            return new ConfigurationValidationResult(false, errors);
+        }
+
+        private static bool IsValidPeriod(FileReRoute reRoute)
+        {
+            string period = reRoute.RateLimitOptions.Period;
+
+            return period.Contains("s") || period.Contains("m") || period.Contains("h") || period.Contains("d");
+        }
     }
 }

src/Ocelot/Configuration/Validator/RateLimitOptionsValidationError.cs

@@ -0,0 +1,15 @@
+using Ocelot.Errors;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Ocelot.Configuration.Validator
+{
+    public class RateLimitOptionsValidationError : Error
+    {
+        public RateLimitOptionsValidationError(string message) 
+            : base(message, OcelotErrorCode.RateLimitOptionsError)
+        {
+        }
+    }
+}

src/Ocelot/Errors/OcelotErrorCode.cs

@@ -29,6 +29,7 @@
         RequestTimedOutError,
         UnableToFindQoSProviderError,
         UnableToSetConfigInConsulError,
-        UnmappableRequestError
+        UnmappableRequestError,
+        RateLimitOptionsError
     }
 }

src/Ocelot/LoadBalancer/LoadBalancers/LoadBalancerFactory.cs

@@ -19,7 +19,7 @@ namespace Ocelot.LoadBalancer.LoadBalancers
             switch (reRoute.LoadBalancer)
             {
                 case "RoundRobin":
-                    return new RoundRobinLoadBalancer(await serviceProvider.Get());
+                    return new RoundRobinLoadBalancer(async () => await serviceProvider.Get());
                 case "LeastConnection":
                     return new LeastConnectionLoadBalancer(async () => await serviceProvider.Get(), reRoute.ServiceProviderConfiguraion.ServiceName);
                 default:

src/Ocelot/LoadBalancer/LoadBalancers/RoundRobinLoadBalancer.cs

@@ -2,27 +2,31 @@
 using System.Threading.Tasks;
 using Ocelot.Responses;
 using Ocelot.Values;
+using System;
 
 namespace Ocelot.LoadBalancer.LoadBalancers
 {
     public class RoundRobinLoadBalancer : ILoadBalancer
     {
-        private readonly List<Service> _services;
+        private readonly Func<Task<List<Service>>> _services;
+
         private int _last;
 
-        public RoundRobinLoadBalancer(List<Service> services)
+        public RoundRobinLoadBalancer(Func<Task<List<Service>>> services)
         {
             _services = services;
         }
 
+
         public async Task<Response<HostAndPort>> Lease()
         {
-            if (_last >= _services.Count)
+            var services = await _services.Invoke();
+            if (_last >= services.Count)
             {
                 _last = 0;
             }
 
-            var next = await Task.FromResult(_services[_last]);
+            var next = await Task.FromResult(services[_last]);
             _last++;
             return new OkResponse<HostAndPort>(next.HostAndPort);
         }

src/Ocelot/RateLimit/ClientRateLimitProcessor.cs

@@ -7,6 +7,7 @@ using System.Threading.Tasks;
 
 namespace Ocelot.RateLimit
 {
+
     public class ClientRateLimitProcessor
     {
         private readonly IRateLimitCounterHandler _counterHandler;
@@ -23,7 +24,8 @@ namespace Ocelot.RateLimit
             return _core.ProcessRequest(requestIdentity, option);
         }
 
-        public string RetryAfterFrom(DateTime timestamp, RateLimitRule rule)
+
+        public int RetryAfterFrom(DateTime timestamp, RateLimitRule rule)
         {
             return _core.RetryAfterFrom(timestamp, rule);
         }
@@ -33,5 +35,11 @@ namespace Ocelot.RateLimit
             return _core.GetRateLimitHeaders(context, requestIdentity, option);
         }
 
+        public TimeSpan ConvertToTimeSpan(string timeSpan)
+        {
+            return _core.ConvertToTimeSpan(timeSpan);
         }
+
+    }
+
 }

src/Ocelot/RateLimit/Middleware/ClientRateLimitMiddleware.cs

@@ -75,11 +75,14 @@ namespace Ocelot.RateLimit.Middleware
                     // log blocked request
                     LogBlockedRequest(context, identity, counter, rule);
 
+                    var retrystring = retryAfter.ToString(System.Globalization.CultureInfo.InvariantCulture);
                     // break execution
-                    await ReturnQuotaExceededResponse(context, options, retryAfter);
+                    await ReturnQuotaExceededResponse(context, options, retrystring);
                     _logger.TraceMiddlewareCompleted();
+
                     return;
                 }
+
             }
             //set X-Rate-Limit headers for the longest period
             if (!options.DisableRateLimitHeaders)
@@ -111,7 +114,11 @@ namespace Ocelot.RateLimit.Middleware
 
         public bool IsWhitelisted(ClientRequestIdentity requestIdentity, RateLimitOptions option)
         {
-            return option.ClientWhitelist.Contains(requestIdentity.ClientId);
+            if (option.ClientWhitelist.Contains(requestIdentity.ClientId))
+            {
+                return true;
+            }
+            return false;
         }
 
         public virtual void LogBlockedRequest(HttpContext httpContext, ClientRequestIdentity identity, RateLimitCounter counter, RateLimitRule rule)
@@ -144,6 +151,6 @@ namespace Ocelot.RateLimit.Middleware
         }
 
     }
+
 }
 
-

src/Ocelot/RateLimit/RateLimitCore.cs

@@ -34,23 +34,45 @@ namespace Ocelot.RateLimit
                 if (entry.HasValue)
                 {
                     // entry has not expired
-                    if (entry.Value.Timestamp + TimeSpan.FromSeconds(rule.PeriodTimespan) >= DateTime.UtcNow)
+                    if (entry.Value.Timestamp + ConvertToTimeSpan(rule.Period) >= DateTime.UtcNow)
                     {
                         // increment request count
                         var totalRequests = entry.Value.TotalRequests + 1;
-
                         // deep copy
                         counter = new RateLimitCounter(entry.Value.Timestamp, totalRequests);
-                        
                     }
                 }
-                // stores: id (string) - timestamp (datetime) - total_requests (long)
-                _counterHandler.Set(counterId, counter, TimeSpan.FromSeconds(rule.PeriodTimespan));
             }
 
+            if (counter.TotalRequests > rule.Limit)
+            {
+                var retryAfter = RetryAfterFrom(counter.Timestamp, rule);
+                if (retryAfter > 0)
+                {
+                    var expirationTime = TimeSpan.FromSeconds(rule.PeriodTimespan);
+                    _counterHandler.Set(counterId, counter, expirationTime);
+                }
+                else
+                {
+                    _counterHandler.Remove(counterId);
+                }
+            }
+            else
+            {
+                var expirationTime = ConvertToTimeSpan(rule.Period);
+                _counterHandler.Set(counterId, counter, expirationTime);
+            }
             return counter;
         }
 
+        public void SaveRateLimitCounter(ClientRequestIdentity requestIdentity, RateLimitOptions option, RateLimitCounter counter, TimeSpan expirationTime)
+        {
+            var counterId = ComputeCounterKey(requestIdentity, option);
+            var rule = option.RateLimitRule;
+            // stores: id (string) - timestamp (datetime) - total_requests (long)
+            _counterHandler.Set(counterId, counter, expirationTime);
+        }
+
         public RateLimitHeaders GetRateLimitHeaders(HttpContext context, ClientRequestIdentity requestIdentity, RateLimitOptions option)
         {
             var rule = option.RateLimitRule;
@@ -92,12 +114,12 @@ namespace Ocelot.RateLimit
             return BitConverter.ToString(hashBytes).Replace("-", string.Empty);
         }
 
-        public string RetryAfterFrom(DateTime timestamp, RateLimitRule rule)
+        public int RetryAfterFrom(DateTime timestamp, RateLimitRule rule)
         {
             var secondsPast = Convert.ToInt32((DateTime.UtcNow - timestamp).TotalSeconds);
             var retryAfter = Convert.ToInt32(TimeSpan.FromSeconds(rule.PeriodTimespan).TotalSeconds);
             retryAfter = retryAfter > 1 ? retryAfter - secondsPast : 1;
-            return retryAfter.ToString(System.Globalization.CultureInfo.InvariantCulture);
+            return retryAfter;
         }
 
         public TimeSpan ConvertToTimeSpan(string timeSpan)

src/Ocelot/Requester/HttpClientHttpRequester.cs

@@ -22,7 +22,9 @@ namespace Ocelot.Requester
 
         public async Task<Response<HttpResponseMessage>> GetResponse(Request.Request request)
         {
-            IHttpClient httpClient = GetHttpClient(request);
+            var cacheKey = GetCacheKey(request);
+
+            IHttpClient httpClient = GetHttpClient(cacheKey);
             try
             {
                 var response = await httpClient.SendAsync(request.HttpRequestMessage);
@@ -42,32 +44,28 @@ namespace Ocelot.Requester
             {
                 return new ErrorResponse<HttpResponseMessage>(new UnableToCompleteRequestError(exception));
             }
+            finally
+            {
+                _cacheHandlers.Set(cacheKey, httpClient, TimeSpan.FromHours(24));
+            }
 
         }
 
-        private IHttpClient GetHttpClient(Request.Request request)
+        private IHttpClient GetHttpClient(string cacheKey)
         {
             var builder = new HttpClientBuilder();
-            var cacheKey = GetCacheKey(request, builder);
+
             var httpClient = _cacheHandlers.Get(cacheKey);
             if (httpClient == null)
             {
                 httpClient = builder.Create();
             }
-            _cacheHandlers.Set(cacheKey, httpClient, TimeSpan.FromHours(6));
             return httpClient;
         }
 
-        private string GetCacheKey(Request.Request request, IHttpClientBuilder builder)
+        private string GetCacheKey(Request.Request request)
         {
             string baseUrl = $"{request.HttpRequestMessage.RequestUri.Scheme}://{request.HttpRequestMessage.RequestUri.Authority}";
-
-            if (request.IsQos)
-            {
-                builder.WithQos(request.QosProvider, _logger);
-                baseUrl = $"{baseUrl}{request.QosProvider.CircuitBreaker.CircuitBreakerPolicy.PolicyKey}";
-            }
-
             return baseUrl;
         }
     }

test/Ocelot.UnitTests/LoadBalancer/RoundRobinTests.cs

@@ -6,6 +6,7 @@ using Ocelot.Values;
 using Shouldly;
 using TestStack.BDDfy;
 using Xunit;
+using System.Threading.Tasks;
 
 namespace Ocelot.UnitTests.LoadBalancer
 {
@@ -24,7 +25,7 @@ namespace Ocelot.UnitTests.LoadBalancer
                 new Service("product", new HostAndPort("127.0.0.1", 5001), string.Empty, string.Empty, new string[0])
             };
 
-            _roundRobin = new RoundRobinLoadBalancer(_services);
+            _roundRobin = new RoundRobinLoadBalancer(() => Task.FromResult(_services));
         }
 
         [Fact]