Created
August 3, 2017 17:27
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Adds expvar and some dogstatsd to kubernete's examples/guestbook-go/main.go
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/* | |
Copyright 2014 The Kubernetes Authors. | |
Licensed under the Apache License, Version 2.0 (the "License"); | |
you may not use this file except in compliance with the License. | |
You may obtain a copy of the License at | |
http://www.apache.org/licenses/LICENSE-2.0 | |
Unless required by applicable law or agreed to in writing, software | |
distributed under the License is distributed on an "AS IS" BASIS, | |
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
See the License for the specific language governing permissions and | |
limitations under the License. | |
*/ | |
package main | |
import ( | |
"encoding/json" | |
_ "expvar" | |
"log" | |
"net/http" | |
"os" | |
"strings" | |
"github.com/DataDog/datadog-go/statsd" | |
"github.com/codegangsta/negroni" | |
"github.com/gorilla/mux" | |
"github.com/xyproto/simpleredis" | |
) | |
var ( | |
masterPool *simpleredis.ConnectionPool | |
slavePool *simpleredis.ConnectionPool | |
dogstatsd *statsd.Client | |
) | |
func ListRangeHandler(rw http.ResponseWriter, req *http.Request) { | |
key := mux.Vars(req)["key"] | |
list := simpleredis.NewList(slavePool, key) | |
members := HandleError(list.GetAll()).([]string) | |
membersJSON := HandleError(json.MarshalIndent(members, "", " ")).([]byte) | |
rw.Write(membersJSON) | |
} | |
func ListPushHandler(rw http.ResponseWriter, req *http.Request) { | |
dogstatsd.Incr("request_count", []string{"endpoint:submit"}, 1) | |
key := mux.Vars(req)["key"] | |
value := mux.Vars(req)["value"] | |
list := simpleredis.NewList(masterPool, key) | |
HandleError(nil, list.Add(value)) | |
ListRangeHandler(rw, req) | |
} | |
func InfoHandler(rw http.ResponseWriter, req *http.Request) { | |
dogstatsd.Incr("request_count", []string{"endpoint:info"}, 1) | |
info := HandleError(masterPool.Get(0).Do("INFO")).([]byte) | |
rw.Write(info) | |
} | |
func EnvHandler(rw http.ResponseWriter, req *http.Request) { | |
dogstatsd.Incr("request_count", []string{"endpoint:env"}, 1) | |
environment := make(map[string]string) | |
for _, item := range os.Environ() { | |
splits := strings.Split(item, "=") | |
key := splits[0] | |
val := strings.Join(splits[1:], "=") | |
environment[key] = val | |
} | |
envJSON := HandleError(json.MarshalIndent(environment, "", " ")).([]byte) | |
rw.Write(envJSON) | |
} | |
func HandleError(result interface{}, err error) (r interface{}) { | |
if err != nil { | |
panic(err) | |
} | |
return result | |
} | |
func main() { | |
masterPool = simpleredis.NewConnectionPoolHost("redis-master:6379") | |
defer masterPool.Close() | |
slavePool = simpleredis.NewConnectionPoolHost("redis-slave:6379") | |
defer slavePool.Close() | |
var err error | |
dogstatsd, err = statsd.New("dogstatsd.default:8125") | |
if err != nil { | |
log.Printf("Cannot get a DogStatsD client.") | |
} else { | |
dogstatsd.Namespace = "guestbook." | |
dogstatsd.Event(&statsd.Event{ | |
Title: "Guestbook application started.", | |
Text: "Guestbook application started.", | |
}) | |
} | |
go func() { | |
http.ListenAndServe(":2999", http.DefaultServeMux) | |
}() | |
r := mux.NewRouter() | |
r.Path("/lrange/{key}").Methods("GET").HandlerFunc(ListRangeHandler) | |
r.Path("/rpush/{key}/{value}").Methods("GET").HandlerFunc(ListPushHandler) | |
r.Path("/info").Methods("GET").HandlerFunc(InfoHandler) | |
r.Path("/env").Methods("GET").HandlerFunc(EnvHandler) | |
n := negroni.Classic() | |
n.UseHandler(r) | |
n.Run(":3000") | |
} | |
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