我有多个微服务可供客户通过 Ocelot
访问网关。在配置文件中,有一些属性可以指定下游主机和端口。这必须为每条路线完成。
问题是,如果服务的主机名或端口发生变化,我将不得不修改与该特定服务关联的每条路由。
所以,问题是,是否可以在 ocelot.json
中引入 ENV 变量?配置文件?在这种情况下,我只需要修改一个 ENV 变量,所有相关的路由都会受到影响。
这是我当前的配置文件(我使用 docker-compose
所以服务名称用作主机):
"Routes": [
{
"UpstreamPathTemplate": "/api/v1/signIn",
"DownstreamPathTemplate": "/api/v1/signIn",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": "identity-api",
"Port": 80
}
],
"SwaggerKey": "Identity"
},
{
"UpstreamPathTemplate": "/api/v1/validate",
"DownstreamPathTemplate": "/api/v1/validate",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": "identity-api",
"Port": 80
}
],
"SwaggerKey": "Identity"
},
我想要的是:"Routes": [
{
"UpstreamPathTemplate": "/api/v1/signIn",
"DownstreamPathTemplate": "/api/v1/signIn",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": {SERVICE_HOST},
"Port": {SERVICE_PORT}
}
],
"SwaggerKey": "Identity"
},
{
"UpstreamPathTemplate": "/api/v1/validate",
"DownstreamPathTemplate": "/api/v1/validate",
"DownstreamScheme": "http",
"DownstreamHostAndPorts": [
{
"Host": {SERVICE_HOST},
"Port": {SERVICE_PORT}
}
],
"SwaggerKey": "Identity"
},
最佳答案
我能够使用 PostConfigure
实现这个缺失的功能扩展方法。就我而言,我更喜欢将占位符配置放入 Ocelot.json
但您可以更改代码以查看 IConfiguration
而不是使用GlobalHosts
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Ocelot.Configuration.File;
public static class FileConfigurationExtensions
{
public static IServiceCollection ConfigureDownstreamHostAndPortsPlaceholders(
this IServiceCollection services,
IConfiguration configuration)
{
services.PostConfigure<FileConfiguration>(fileConfiguration =>
{
var globalHosts = configuration
.GetSection($"{nameof(FileConfiguration.GlobalConfiguration)}:Hosts")
.Get<GlobalHosts>();
foreach (var route in fileConfiguration.Routes)
{
ConfigureRote(route, globalHosts);
}
});
return services;
}
private static void ConfigureRote(FileRoute route, GlobalHosts globalHosts)
{
foreach (var hostAndPort in route.DownstreamHostAndPorts)
{
var host = hostAndPort.Host;
if (host.StartsWith("{") && host.EndsWith("}"))
{
var placeHolder = host.TrimStart('{').TrimEnd('}');
if (globalHosts.TryGetValue(placeHolder, out var uri))
{
route.DownstreamScheme = uri.Scheme;
hostAndPort.Host = uri.Host;
hostAndPort.Port = uri.Port;
}
}
}
}
}
GlobalHosts
类(class):public class GlobalHosts : Dictionary<string, Uri> { }
用法:public void ConfigureServices(IServiceCollection services)
{
...
services.AddOcelot();
services.ConfigureDownstreamHostAndPortsPlaceholders(Configuration);
}
Ocelot.json
{
"Routes": [
{
"UpstreamPathTemplate": "/my-resource",
"UpstreamHttpMethod": [ "POST" ],
"DownstreamPathTemplate": "/my/resource",
"DownstreamHostAndPorts": [
{
"Host": "{MyService}"
}
]
}
],
"GlobalConfiguration": {
"BaseUrl": "https://localhost:5000",
"Hosts": {
"MyService": "http://localhost:3999"
}
}
}
关于.net-core - ocelot 配置文件中的环境变量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63421563/