kraken

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// Copyright (c) 2016-2019 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//     http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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	"bufio"
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	"encoding/json"
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	"fmt"
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	"log"
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	"net/http"
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	"os"
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	"github.com/gorilla/mux"
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	"github.com/uber/kraken/lib/torrent/networkevent"
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)
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type server struct {
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	events []*networkevent.Event
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}
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func newServer(eventFile *os.File) *server {
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	var events []*networkevent.Event
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	scanner := bufio.NewScanner(eventFile)
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	for scanner.Scan() {
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		line := scanner.Bytes()
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		var event networkevent.Event
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		if err := json.Unmarshal(line, &event); err != nil {
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			log.Printf("Error unmarshalling event: %s\n", err)
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			continue
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		}
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		events = append(events, &event)
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	}
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	events = networkevent.Filter(
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		events,
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		networkevent.AddTorrent,
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		networkevent.AddActiveConn,
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		networkevent.DropActiveConn,
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		networkevent.BlacklistConn,
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		networkevent.ReceivePiece,
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		networkevent.TorrentComplete,
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		networkevent.TorrentCancelled)
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	networkevent.Sort(events)
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	return &server{events}
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}
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func (s *server) handler() http.Handler {
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	r := mux.NewRouter()
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	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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		http.Redirect(w, r, "/static/html/app.html", http.StatusSeeOther)
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	})
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	fs := http.FileServer(http.Dir("./tools/bin/visualization/static/"))
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	r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", fs))
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	r.HandleFunc("/events", s.getEvents)
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	return r
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}
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func (s *server) getEvents(w http.ResponseWriter, r *http.Request) {
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	if err := json.NewEncoder(w).Encode(s.events); err != nil {
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		log.Printf("Error encoding events: %s\n", err)
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		http.Error(w, fmt.Sprintf("encode events: %s", err), 500)
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		return
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	}
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}
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type byTime []networkevent.Event
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func (s byTime) Len() int           { return len(s) }
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func (s byTime) Less(i, j int) bool { return s[i].Time.Before(s[j].Time) }
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func (s byTime) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
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