Bug report server script

scripts/rageshake.go

@@ -0,0 +1,108 @@
+// Run a web server capable of dumping bug reports sent by Riot.
+// Requires Go 1.5+
+// Usage:   go run rageshake.go PORT
+// Example: go run rageshake.go 8080
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+)
+
+var maxPayloadSize = 1024 * 1024 * 55 // 55 MB
+
+type LogEntry struct {
+	ID    string `json:"id"`
+	Lines string `json:"lines"`
+}
+
+type Payload struct {
+	Text      string     `json:"text"`
+	Version   string     `json:"version"`
+	UserAgent string     `json:"user_agent"`
+	Logs      []LogEntry `json:"logs"`
+}
+
+func respond(code int, w http.ResponseWriter) {
+	w.WriteHeader(code)
+	w.Write([]byte("{}"))
+}
+
+func gzipAndSave(data []byte, filepath string) error {
+	if _, err := os.Stat(filepath); err == nil {
+		return fmt.Errorf("file already exists") // the user can just retry
+	}
+	var b bytes.Buffer
+	gz := gzip.NewWriter(&b)
+	if _, err := gz.Write(data); err != nil {
+		return err
+	}
+	if err := gz.Flush(); err != nil {
+		return err
+	}
+	if err := gz.Close(); err != nil {
+		return err
+	}
+	if err := ioutil.WriteFile(filepath, b.Bytes(), 0644); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		if req.Method != "POST" && req.Method != "OPTIONS" {
+			respond(405, w)
+			return
+		}
+		// Set CORS
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
+		w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
+		if req.Method == "OPTIONS" {
+			respond(200, w)
+			return
+		}
+		if length, err := strconv.Atoi(req.Header.Get("Content-Length")); err != nil || length > maxPayloadSize {
+			respond(413, w)
+			return
+		}
+		var p Payload
+		if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
+			respond(400, w)
+			return
+		}
+		// Dump bug report to disk as form:
+		//  "bugreport-20170115-112233.log.gz" => user text, version, user agent, # logs
+		//  "bugreport-20170115-112233-0.log.gz" => most recent log
+		//  "bugreport-20170115-112233-1.log.gz" => ...
+		//  "bugreport-20170115-112233-N.log.gz" => oldest log
+		t := time.Now().UTC()
+		prefix := t.Format("bugreport-20060102-150405")
+		summary := fmt.Sprintf(
+			"%s\n\nNumber of logs: %d\nVersion: %s\nUser-Agent: %s\n", p.Text, len(p.Logs), p.Version, p.UserAgent,
+		)
+		if err := gzipAndSave([]byte(summary), prefix+".log.gz"); err != nil {
+			respond(500, w)
+			return
+		}
+		for i, log := range p.Logs {
+			if err := gzipAndSave([]byte(log.Lines), fmt.Sprintf("%s-%d.log.gz", prefix, i)); err != nil {
+				respond(500, w)
+				return // TODO: Rollback?
+			}
+		}
+		respond(200, w)
+	})
+
+	port := os.Args[1]
+	log.Fatal(http.ListenAndServe(":"+port, nil))
+}