Sentinel
Introduction
Hertz provides hertz-contrib/opensergo, to facilitate the integration of sentinel-golang
Installation
go get github.com/hertz-contrib/opensergo
Config
sentinel-golang
The basic configuration of sentinel-golang can be found at documentation
Server
SentinelServerMiddleware
SentinelServerMiddleware() returns new app.HandlerFunc
Default resource name is {method}:{path}, such as “GET:/api/users/:id”
Default block fallback is returning 429 code
Define your own behavior by WithServerXxx()
Sample Code:
package main
// ...
func main() {
h := server.Default(server.WithHostPorts(":8081"))
h.Use(adaptor.SentinelServerMiddleware())
// ...
}
WithServerResourceExtractor
WithServerResourceExtractor sets the resource extractor of the web requests for server side.
Sample Code:
package main
// ...
func main() {
h := server.Default(server.WithHostPorts(":8081"))
h.Use(adaptor.SentinelServerMiddleware(
// customize resource extractor if required
// method_path by default
adaptor.WithServerResourceExtractor(func(c context.Context, ctx *app.RequestContext) string {
return "server_test"
}),
))
// ...
}
WithServerBlockFallback
WithServerBlockFallback sets the fallback handler when requests are blocked for server side.
Sample Code:
package main
// ...
func main() {
h := server.Default(server.WithHostPorts(":8081"))
h.Use(adaptor.SentinelServerMiddleware(
// customize block fallback if required
// abort with status 429 by default
adaptor.WithServerBlockFallback(func(c context.Context, ctx *app.RequestContext) {
ctx.AbortWithStatusJSON(400, utils.H{
"err": "too many request; the quota used up",
"code": 10222,
})
}),
))
// ...
}
Client
SentinelClientMiddleware
SentinelClientMiddleware() returns new client.Middleware
Default resource name is {method}:{path}, such as “GET:/api/users”
Default block fallback is returning blockError
Define your own behavior by WithClientXxx()
Sample Code:
package main
// ...
func main() {
c, err := client.NewClient()
if err != nil {
log.Fatalf("Unexpected error: %+v", err)
return
}
c.Use(adaptor.SentinelClientMiddleware())
}
WithClientResourceExtractor
WithClientResourceExtractor sets the resource extractor of the web requests for client side.
Sample Code:
package main
// ...
func main() {
c, err := client.NewClient()
if err != nil {
log.Fatalf("Unexpected error: %+v", err)
return
}
c.Use(adaptor.SentinelClientMiddleware(
// customize resource extractor if required
// method_path by default
adaptor.WithClientResourceExtractor(func(ctx context.Context, request *protocol.Request, response *protocol.Response) string {
return "client_test"
}),
))
}
WithClientBlockFallback
WithClientBlockFallback sets the fallback handler when requests are blocked for client side.
Sample Code:
package main
// ...
func main() {
c, err := client.NewClient()
if err != nil {
log.Fatalf("Unexpected error: %+v", err)
return
}
c.Use(adaptor.SentinelClientMiddleware(
// customize resource extractor if required
// method_path by default
adaptor.WithClientBlockFallback(func(ctx context.Context, req *protocol.Request, resp *protocol.Response, blockError error) error {
resp.SetStatusCode(http.StatusBadRequest)
resp.SetBody([]byte("request failed"))
return blockError
}),
))
}
Complete sample code
Full usage examples are available at example