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more work towards getting service discovery working with load balancing

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This commit is contained in:
Tom Gardham-Pallister
2017-02-02 21:34:15 +00:00
parent 37aaeeed82
commit 07ca7989b0
14 changed files with 248 additions and 241 deletions
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71
src/Ocelot/Configuration/Creator/FileOcelotConfigurationCreator.cs
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@@ -27,13 +27,19 @@ namespace Ocelot.Configuration.Creator
private readonly IClaimToThingConfigurationParser _claimToThingConfigurationParser;
private readonly ILogger<FileOcelotConfigurationCreator> _logger;
private readonly ILoadBalancerFactory _loadBalanceFactory;
private readonly ILoadBalancerHouse _loadBalancerHouse;
public FileOcelotConfigurationCreator(
IOptions<FileConfiguration> options,
IConfigurationValidator configurationValidator,
IClaimToThingConfigurationParser claimToThingConfigurationParser,
ILogger<FileOcelotConfigurationCreator> logger)
ILogger<FileOcelotConfigurationCreator> logger,
ILoadBalancerFactory loadBalancerFactory,
ILoadBalancerHouse loadBalancerHouse)
{
_loadBalanceFactory = loadBalancerFactory;
_loadBalancerHouse = loadBalancerHouse;
_options = options;
_configurationValidator = configurationValidator;
_claimToThingConfigurationParser = claimToThingConfigurationParser;
@@ -78,55 +84,62 @@ namespace Ocelot.Configuration.Creator
return new OcelotConfiguration(reRoutes);
}
private ReRoute SetUpReRoute(FileReRoute reRoute, FileGlobalConfiguration globalConfiguration)
private ReRoute SetUpReRoute(FileReRoute fileReRoute, FileGlobalConfiguration globalConfiguration)
{
var globalRequestIdConfiguration = !string.IsNullOrEmpty(globalConfiguration?.RequestIdKey);
var upstreamTemplate = BuildUpstreamTemplate(reRoute);
var upstreamTemplate = BuildUpstreamTemplate(fileReRoute);
var isAuthenticated = !string.IsNullOrEmpty(reRoute.AuthenticationOptions?.Provider);
var isAuthenticated = !string.IsNullOrEmpty(fileReRoute.AuthenticationOptions?.Provider);
var isAuthorised = reRoute.RouteClaimsRequirement?.Count > 0;
var isAuthorised = fileReRoute.RouteClaimsRequirement?.Count > 0;
var isCached = reRoute.FileCacheOptions.TtlSeconds > 0;
var isCached = fileReRoute.FileCacheOptions.TtlSeconds > 0;
var requestIdKey = globalRequestIdConfiguration
? globalConfiguration.RequestIdKey
: reRoute.RequestIdKey;
: fileReRoute.RequestIdKey;
var useServiceDiscovery = !string.IsNullOrEmpty(reRoute.ServiceName)
var useServiceDiscovery = !string.IsNullOrEmpty(fileReRoute.ServiceName)
&& !string.IsNullOrEmpty(globalConfiguration?.ServiceDiscoveryProvider?.Address)
&& !string.IsNullOrEmpty(globalConfiguration?.ServiceDiscoveryProvider?.Provider);
ReRoute reRoute;
if (isAuthenticated)
{
var authOptionsForRoute = new AuthenticationOptions(reRoute.AuthenticationOptions.Provider,
reRoute.AuthenticationOptions.ProviderRootUrl, reRoute.AuthenticationOptions.ScopeName,
reRoute.AuthenticationOptions.RequireHttps, reRoute.AuthenticationOptions.AdditionalScopes,
reRoute.AuthenticationOptions.ScopeSecret);
var authOptionsForRoute = new AuthenticationOptions(fileReRoute.AuthenticationOptions.Provider,
fileReRoute.AuthenticationOptions.ProviderRootUrl, fileReRoute.AuthenticationOptions.ScopeName,
fileReRoute.AuthenticationOptions.RequireHttps, fileReRoute.AuthenticationOptions.AdditionalScopes,
fileReRoute.AuthenticationOptions.ScopeSecret);
var claimsToHeaders = GetAddThingsToRequest(reRoute.AddHeadersToRequest);
var claimsToClaims = GetAddThingsToRequest(reRoute.AddClaimsToRequest);
var claimsToQueries = GetAddThingsToRequest(reRoute.AddQueriesToRequest);
var claimsToHeaders = GetAddThingsToRequest(fileReRoute.AddHeadersToRequest);
var claimsToClaims = GetAddThingsToRequest(fileReRoute.AddClaimsToRequest);
var claimsToQueries = GetAddThingsToRequest(fileReRoute.AddQueriesToRequest);
return new ReRoute(new DownstreamPathTemplate(reRoute.DownstreamPathTemplate), reRoute.UpstreamTemplate,
reRoute.UpstreamHttpMethod, upstreamTemplate, isAuthenticated,
reRoute = new ReRoute(new DownstreamPathTemplate(fileReRoute.DownstreamPathTemplate), fileReRoute.UpstreamTemplate,
fileReRoute.UpstreamHttpMethod, upstreamTemplate, isAuthenticated,
authOptionsForRoute, claimsToHeaders, claimsToClaims,
reRoute.RouteClaimsRequirement, isAuthorised, claimsToQueries,
requestIdKey, isCached, new CacheOptions(reRoute.FileCacheOptions.TtlSeconds),
reRoute.ServiceName, useServiceDiscovery, globalConfiguration?.ServiceDiscoveryProvider?.Provider,
globalConfiguration?.ServiceDiscoveryProvider?.Address, reRoute.DownstreamScheme,
reRoute.LoadBalancer, reRoute.DownstreamHost, reRoute.DownstreamPort);
fileReRoute.RouteClaimsRequirement, isAuthorised, claimsToQueries,
requestIdKey, isCached, new CacheOptions(fileReRoute.FileCacheOptions.TtlSeconds),
fileReRoute.ServiceName, useServiceDiscovery, globalConfiguration?.ServiceDiscoveryProvider?.Provider,
globalConfiguration?.ServiceDiscoveryProvider?.Address, fileReRoute.DownstreamScheme,
fileReRoute.LoadBalancer, fileReRoute.DownstreamHost, fileReRoute.DownstreamPort);
}
return new ReRoute(new DownstreamPathTemplate(reRoute.DownstreamPathTemplate), reRoute.UpstreamTemplate,
reRoute.UpstreamHttpMethod, upstreamTemplate, isAuthenticated,
reRoute = new ReRoute(new DownstreamPathTemplate(fileReRoute.DownstreamPathTemplate), fileReRoute.UpstreamTemplate,
fileReRoute.UpstreamHttpMethod, upstreamTemplate, isAuthenticated,
null, new List<ClaimToThing>(), new List<ClaimToThing>(),
reRoute.RouteClaimsRequirement, isAuthorised, new List<ClaimToThing>(),
requestIdKey, isCached, new CacheOptions(reRoute.FileCacheOptions.TtlSeconds),
reRoute.ServiceName, useServiceDiscovery, globalConfiguration?.ServiceDiscoveryProvider?.Provider,
globalConfiguration?.ServiceDiscoveryProvider?.Address, reRoute.DownstreamScheme,
reRoute.LoadBalancer, reRoute.DownstreamHost, reRoute.DownstreamPort);
fileReRoute.RouteClaimsRequirement, isAuthorised, new List<ClaimToThing>(),
requestIdKey, isCached, new CacheOptions(fileReRoute.FileCacheOptions.TtlSeconds),
fileReRoute.ServiceName, useServiceDiscovery, globalConfiguration?.ServiceDiscoveryProvider?.Provider,
globalConfiguration?.ServiceDiscoveryProvider?.Address, fileReRoute.DownstreamScheme,
fileReRoute.LoadBalancer, fileReRoute.DownstreamHost, fileReRoute.DownstreamPort);
var loadBalancer = _loadBalanceFactory.Get(reRoute);
//todo - not sure if this is the correct key, but this is probably the only unique key i can think of
_loadBalancerHouse.Add($"{fileReRoute.UpstreamTemplate}{fileReRoute.UpstreamHttpMethod}", loadBalancer);
return reRoute;
}
private string BuildUpstreamTemplate(FileReRoute reRoute)

6
src/Ocelot/DependencyInjection/ServiceCollectionExtensions.cs
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@@ -23,11 +23,13 @@ using Ocelot.DownstreamUrlCreator.UrlTemplateReplacer;
using Ocelot.Headers;
using Ocelot.Infrastructure.Claims.Parser;
using Ocelot.Infrastructure.RequestData;
using Ocelot.LoadBalancer.LoadBalancers;
using Ocelot.Logging;
using Ocelot.QueryStrings;
using Ocelot.Request.Builder;
using Ocelot.Requester;
using Ocelot.Responder;
using Ocelot.ServiceDiscovery;
namespace Ocelot.DependencyInjection
{
@@ -59,6 +61,10 @@ namespace Ocelot.DependencyInjection
{
services.AddMvcCore().AddJsonFormatters();
services.AddLogging();
services.AddSingleton<Ocelot.ServiceDiscovery.IServiceProviderFactory, Ocelot.ServiceDiscovery.IServiceProviderFactory>();
services.AddSingleton<ILoadBalancerFactory, ILoadBalancerFactory>();
services.AddSingleton<ILoadBalancerHouse, LoadBalancerHouse>();
services.AddSingleton<IServiceProviderHouse, ServiceProviderHouse>();
services.AddSingleton<IOcelotLoggerFactory, AspDotNetLoggerFactory>();
services.AddSingleton<IUrlBuilder, UrlBuilder>();
services.AddSingleton<IRemoveOutputHeaders, RemoveOutputHeaders>();

6
src/Ocelot/LoadBalancer/LoadBalancers/ILoadBalancerFactory.cs
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@@ -1,7 +1,9 @@
namespace Ocelot.LoadBalancer.LoadBalancers
using Ocelot.Configuration;
namespace Ocelot.LoadBalancer.LoadBalancers
{
public interface ILoadBalancerFactory
{
ILoadBalancer Get(string serviceName, string loadBalancer);
ILoadBalancer Get(ReRoute reRoute);
}
}

28
src/Ocelot/LoadBalancer/LoadBalancers/LoadBalancerFactory.cs
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@@ -1,26 +1,34 @@
using Ocelot.ServiceDiscovery;
using Ocelot.Configuration;
using Ocelot.ServiceDiscovery;
namespace Ocelot.LoadBalancer.LoadBalancers
{
public class LoadBalancerFactory : ILoadBalancerFactory
{
private readonly IServiceProvider _serviceProvider;
public LoadBalancerFactory(IServiceProvider serviceProvider)
private readonly IServiceProviderFactory _serviceProviderFactory;
public LoadBalancerFactory(IServiceProviderFactory serviceProviderFactory)
{
_serviceProvider = serviceProvider;
_serviceProviderFactory = serviceProviderFactory;
}
public ILoadBalancer Get(string serviceName, string loadBalancer)
public ILoadBalancer Get(ReRoute reRoute)
{
switch (loadBalancer)
var serviceConfig = new ServiceConfiguraion(
reRoute.ServiceName,
reRoute.DownstreamHost,
reRoute.DownstreamPort,
reRoute.UseServiceDiscovery);
var serviceProvider = _serviceProviderFactory.Get(serviceConfig);
switch (reRoute.LoadBalancer)
{
case "RoundRobin":
return new RoundRobinLoadBalancer(_serviceProvider.Get());
return new RoundRobinLoadBalancer(serviceProvider.Get());
case "LeastConnection":
return new LeastConnectionLoadBalancer(() => _serviceProvider.Get(), serviceName);
return new LeastConnectionLoadBalancer(() => serviceProvider.Get(), reRoute.ServiceName);
default:
return new NoLoadBalancer(_serviceProvider.Get());
return new NoLoadBalancer(serviceProvider.Get());
}
}
}

35
src/Ocelot/LoadBalancer/Middleware/LoadBalancingMiddleware.cs
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@@ -14,37 +14,30 @@ namespace Ocelot.LoadBalancer.Middleware
{
private readonly RequestDelegate _next;
private readonly IOcelotLogger _logger;
private readonly ILoadBalancerHouse _loadBalancerHouse;
public LoadBalancingMiddleware(RequestDelegate next,
IOcelotLoggerFactory loggerFactory,
IRequestScopedDataRepository requestScopedDataRepository)
IRequestScopedDataRepository requestScopedDataRepository,
ILoadBalancerHouse loadBalancerHouse)
: base(requestScopedDataRepository)
{
_next = next;
_logger = loggerFactory.CreateLogger<QueryStringBuilderMiddleware>();
_loadBalancerHouse = loadBalancerHouse;
}
public async Task Invoke(HttpContext context)
{
_logger.LogDebug("started calling query string builder middleware");
//todo - get out of di? or do this when we bootstrap?
var serviceProviderFactory = new ServiceProviderFactory();
var serviceConfig = new ServiceConfiguraion(
DownstreamRoute.ReRoute.ServiceName,
DownstreamRoute.ReRoute.DownstreamHost,
DownstreamRoute.ReRoute.DownstreamPort,
DownstreamRoute.ReRoute.UseServiceDiscovery);
//todo - get this out of some kind of service provider house?
var serviceProvider = serviceProviderFactory.Get(serviceConfig);
//todo - get out of di? or do this when we bootstrap?
var loadBalancerFactory = new LoadBalancerFactory(serviceProvider);
//todo - currently instanciates a load balancer per request which is wrong,
//need some kind of load balance house! :)
var loadBalancer = loadBalancerFactory.Get(DownstreamRoute.ReRoute.ServiceName, DownstreamRoute.ReRoute.LoadBalancer);
var response = loadBalancer.Lease();
var loadBalancer = _loadBalancerHouse.Get($"{DownstreamRoute.ReRoute.UpstreamTemplate}{DownstreamRoute.ReRoute.UpstreamHttpMethod}");
//todo check reponse and return error
var response = loadBalancer.Data.Lease();
//todo check reponse and return error
SetHostAndPortForThisRequest(response.Data);
_logger.LogDebug("calling next middleware");
//todo - try next middleware if we get an exception make sure we release
@@ -53,11 +46,11 @@ namespace Ocelot.LoadBalancer.Middleware
{
await _next.Invoke(context);
loadBalancer.Release(response.Data);
loadBalancer.Data.Release(response.Data);
}
catch (Exception exception)
catch (Exception)
{
loadBalancer.Release(response.Data);
loadBalancer.Data.Release(response.Data);
throw;
}

12
src/Ocelot/LoadBalancer/Middleware/LoadBalancingMiddlewareExtensions.cs Normal file
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@@ -0,0 +1,12 @@
using Microsoft.AspNetCore.Builder;
namespace Ocelot.LoadBalancer.Middleware
{
public static class LoadBalancingMiddlewareExtensions
{
public static IApplicationBuilder UseLoadBalancingMiddlewareExtensions(this IApplicationBuilder builder)
{
return builder.UseMiddleware<LoadBalancingMiddleware>();
}
}
}

15
src/Ocelot/Middleware/OcelotMiddleware.cs
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@@ -3,6 +3,7 @@ using System.Net.Http;
using Ocelot.DownstreamRouteFinder;
using Ocelot.Errors;
using Ocelot.Infrastructure.RequestData;
using Ocelot.Values;
namespace Ocelot.Middleware
{
@@ -69,6 +70,20 @@ namespace Ocelot.Middleware
}
}
public HostAndPort HostAndPort
{
get
{
var hostAndPort = _requestScopedDataRepository.Get<HostAndPort>("HostAndPort");
return hostAndPort.Data;
}
}
public void SetHostAndPortForThisRequest(HostAndPort hostAndPort)
{
_requestScopedDataRepository.Add("HostAndPort", hostAndPort);
}
public void SetDownstreamRouteForThisRequest(DownstreamRoute downstreamRoute)
{
_requestScopedDataRepository.Add("DownstreamRoute", downstreamRoute);

2
src/Ocelot/ServiceDiscovery/IServiceProviderFactory.cs
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@@ -1,3 +1,5 @@
using System;
namespace Ocelot.ServiceDiscovery
{
public interface IServiceProviderFactory

12
src/Ocelot/ServiceDiscovery/IServiceProviderHouse.cs
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@@ -1,12 +0,0 @@
using System;
using System.Collections.Generic;
using Ocelot.Responses;
namespace Ocelot.ServiceDiscovery
{
public interface IServiceProviderHouse
{
Response<IServiceProvider> Get(string key);
Response Add(string key, IServiceProvider serviceProvider);
}
}

34
src/Ocelot/ServiceDiscovery/ServiceProviderHouse.cs
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@@ -1,34 +0,0 @@
using System.Collections.Generic;
using Ocelot.Responses;
namespace Ocelot.ServiceDiscovery
{
public class ServiceProviderHouse : IServiceProviderHouse
{
private Dictionary<string, Ocelot.ServiceDiscovery.IServiceProvider> _serviceProviders;
public ServiceProviderHouse()
{
_serviceProviders = new Dictionary<string, Ocelot.ServiceDiscovery.IServiceProvider>();
}
public Response<IServiceProvider> Get(string key)
{
IServiceProvider serviceProvider;
if(_serviceProviders.TryGetValue(key, out serviceProvider))
{
return new OkResponse<Ocelot.ServiceDiscovery.IServiceProvider>(serviceProvider);
}
return new ErrorResponse<IServiceProvider>(new List<Ocelot.Errors.Error>()
{
new UnableToFindServiceProviderError($"unabe to find service provider for {key}")
});
}
public Response Add(string key, IServiceProvider serviceProvider)
{
_serviceProviders[key] = serviceProvider;
return new OkResponse();
}
}
}