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87 lines
1.8 KiB
Go
87 lines
1.8 KiB
Go
package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"github.com/patrickmn/go-cache"
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"io/ioutil"
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"net/http"
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"os"
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"time"
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)
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// ConfigType represents config info
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type ConfigType struct {
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HostPort string
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Stacosys string
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CorsOrigin string
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}
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var config ConfigType
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var countCache = cache.New(5*time.Minute, 10*time.Minute)
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func die(format string, v ...interface{}) {
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fmt.Fprintln(os.Stderr, fmt.Sprintf(format, v...))
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os.Exit(1)
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}
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func commentsCount(w http.ResponseWriter, r *http.Request) {
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// only GET method is supported
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if r.Method != "GET" {
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http.NotFound(w, r)
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return
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}
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// set header
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w.Header().Add("Content-Type", "application/json")
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w.Header().Add("Access-Control-Allow-Origin", config.CorsOrigin)
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// get cached value
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cachedBody, found := countCache.Get(r.URL.String())
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if found {
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//fmt.Printf("return cached value")
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w.Write([]byte(cachedBody.(string)))
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return
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}
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// relay request to stacosys
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fmt.Println("QUERY: " + config.Stacosys + r.URL.String())
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response, err := http.Get(config.Stacosys + r.URL.String())
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if err != nil {
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http.NotFound(w, r)
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return
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}
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defer response.Body.Close()
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body, err := ioutil.ReadAll(response.Body)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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// cache body and return response
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countCache.Set(r.URL.String(), string(body), cache.DefaultExpiration)
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fmt.Printf(string(body))
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w.Write(body)
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}
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func main() {
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pathname := flag.String("config", "", "config pathname")
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flag.Parse()
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if *pathname == "" {
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die("%s --config <pathname>", os.Args[0])
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}
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// read config File
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file, e := ioutil.ReadFile(*pathname)
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if e != nil {
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die("File error: %v", e)
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}
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json.Unmarshal(file, &config)
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fmt.Printf("config: %s\n", string(file))
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http.HandleFunc("/comments/count/", commentsCount)
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http.HandleFunc("/comments/count", commentsCount)
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http.ListenAndServe(config.HostPort, nil)
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}
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