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perfmonitor.go
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perfmonitor.go
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// Created by Olga Belavina
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package main
import (
"encoding/json"
"flag"
"fmt"
"net/http"
"os"
"github.com/Seneca-CDOT/StatUtils/perfstats"
)
type response struct {
Status string `json:"status"`
Data interface{} `json:"data"`
Message string `json:"message"`
}
type appHandler func(http.ResponseWriter, *http.Request) (interface{}, error)
// implement the http.Handler interface's ServeHTTP to add error handling
// and uniform json response format
func (getData appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
data, err := getData(w, r)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
json.NewEncoder(w).Encode(response{
Status: "error",
Data: nil,
Message: err.Error(),
})
return
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(response{
Status: "success",
Data: data,
Message: "",
})
}
// Processes http request for latest system performance statistics
func sysStatsHandler(w http.ResponseWriter, r *http.Request) (interface{}, error) {
return perfstats.PlatformSysStats()
}
// Get host details such as platform & hostname
func computerInfoHandler(w http.ResponseWriter, r *http.Request) (interface{}, error) {
return perfstats.GetPlatformInfo()
}
func main() {
// -- define command line args
httpPortPtr := flag.Int("port", 9159, "HTTP server port")
version := flag.Bool("version", false, "print current perfmonitor version and exit")
flag.Parse()
if *version {
fmt.Println(perfstats.AppVersion)
os.Exit(0)
}
// start up http server
fmt.Printf("Listening on port %d\n", *httpPortPtr)
// http routes:
http.Handle("/sysstats", appHandler(sysStatsHandler))
http.Handle("/platform", appHandler(computerInfoHandler))
http.ListenAndServe(fmt.Sprintf(":%d", *httpPortPtr), nil)
}