Non-offical implementation of Spring Cloud feign. Tips: Non-full-features, only some basic and useful features implemented.
Use go-eureka-client together, coz go-feign uses go-eureka-client to discover registry apps and gets all apps' instances.
Supported features.
Request urls from configuration.
// 1.1 configure maps, app => app's urls
feign.DefaultFeign.UseUrls(map[string][]string{
"MS-REGISTRY-URLS": {"http://192.168.20.236:9001", "http://192.168.20.237:9001"},
})
// 2.1 Use app name to balancely request all instances
res, err := feign.DefaultFeign.App("MS-REGISTRY-URLS").R().SetHeaders(map[string]string{
"Content-Type": "application/json",
}).Get("/eureka/apps/MS-REGISTRY")
if err != nil {
log.Println("err: ", err.Error())
return
}
log.Println("res=", string(res.Body()))
Full sample code, refer to: samples/sample_use_urls.go
Use discovery client to get all registry apps, and then request app's urls from registry balancely.
// use go-eureka-client to communicate with registry
runEurekaClient()
// feign.DefaultFeign use eureka.DefaultClient to get registry apps
res, err := feign.DefaultFeign.App("MS-REGISTRY").R().
SetHeaders(map[string]string{
"Content-Type": "application/json",
}).Get("/eureka/apps/WM")
if err != nil {
log.Println("err=", err.Error())
return
}
log.Println("res=", string(res.Body()))
Full sample code, refer to: samples/sample_use_discover_client.go
Mixed use of UseUrls() and UseDiscoveryClient().
// 1.1 configure maps, app => app's urls
feign.DefaultFeign.UseUrls(map[string][]string{
"MS-REGISTRY-URLS": {"http://192.168.20.236:9001", "http://192.168.20.237:9001"},
})
// 1.2 use discovery client
config := eureka.GetDefaultEurekaClientConfig()
config.UseDnsForFetchingServiceUrls = true
config.Region = "region-cn-hd-1"
config.AvailabilityZones = map[string]string{
"region-cn-hd-1": "zone-cn-hz-1",
}
config.EurekaServerDNSName = "dev.ms-registry.xf.io"
config.EurekaServerUrlContext = "eureka"
config.EurekaServerPort = "9001"
eureka.DefaultClient.Config(config).
Register("APP_ID_CLIENT_FROM_DNS", 9000).
Run()
// 2.1 request by registry apps
log.Println("----> request by registy apps")
// assign a eureka client explicitly, or use the eureka.DefaultClient by default.
//feign.DefaultFeign.UseDiscoveryClient(eureka.DefaultClient)
res, err := feign.DefaultFeign.App("MS-REGISTRY").R().SetHeaders(map[string]string{
"Content-Type": "application/json",
}).Get("/eureka/apps/WM")
if err != nil {
log.Println("err=", err.Error())
return
}
log.Println("res=", string(res.Body()))
// 2.2 request by configuration apps
log.Println("----> request by configuration apps")
res, err = feign.DefaultFeign.App("MS-REGISTRY-URLS").R().SetHeaders(map[string]string{
"Content-Type": "application/json",
}).Get("/eureka/apps/WM")
if err != nil {
log.Println("err=", err.Error())
return
}
log.Println("res=", string(res.Body()))
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