initial announce response

config/config.go

@@ -41,6 +41,7 @@ type Storage struct {
 	MaxIdleConn int       `json:"max_idle_conn"`
 	IdleTimeout *Duration `json:"idle_timeout"`
 	ConnTimeout *Duration `json:"conn_timeout"`
+	TxRetries   int       `json:"tx_retries"`
 }
 
 // Config represents a configuration for a server.Server.

config/config_test.go

@@ -25,7 +25,8 @@ var exampleJson = `{
 
     "max_idle_conn": 3,
     "idle_timeout": "240s",
-    "conn_timeout": "5s"
+    "conn_timeout": "5s",
+    "tx_retries": 3
   },
 
   "private": true,

main.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/pushrax/chihaya/config"
 	"github.com/pushrax/chihaya/server"
+	_ "github.com/pushrax/chihaya/storage/redis"
 )
 
 var (

server/announce.go

@@ -23,6 +23,9 @@ func (s Server) serveAnnounce(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Retry failed transactions a specified number of times
+	for i := 0; i < s.conf.Storage.TxRetries; i++ {
+
 		// Start a transaction
 		tx, err := s.dbConnPool.Get()
 		if err != nil {
@@ -189,7 +192,68 @@ func (s Server) serveAnnounce(w http.ResponseWriter, r *http.Request) {
 			}
 		}
 
-	// TODO compact, response, etc...
+		if ip != peer.IP || port != peer.Port {
+			peer.Port = port
+			peer.IP = ip
+		}
+
+		// If the transaction failed, retry
+		err = tx.Commit()
+		if err != nil {
+			continue
+		}
+
+		// Generate the response
+		seedCount := len(torrent.Seeders)
+		leechCount := len(torrent.Leechers)
+
+		writeBencoded(w, "d")
+		writeBencoded(w, "complete")
+		writeBencoded(w, seedCount)
+		writeBencoded(w, "incomplete")
+		writeBencoded(w, leechCount)
+		writeBencoded(w, "interval")
+		writeBencoded(w, s.conf.Announce.Duration)
+		writeBencoded(w, "min interval")
+		writeBencoded(w, s.conf.MinAnnounce.Duration)
+
+		if numWant > 0 && event != "stopped" && event != "paused" {
+			writeBencoded(w, "peers")
+			var peerCount, count int
+
+			if compact {
+				if left > 0 {
+					peerCount = minInt(numWant, leechCount)
+				} else {
+					peerCount = minInt(numWant, leechCount+seedCount-1)
+				}
+				writeBencoded(w, strconv.Itoa(peerCount*6))
+				writeBencoded(w, ":")
+			} else {
+				writeBencoded(w, "l")
+			}
+
+			if left > 0 {
+				// If they're seeding, give them only leechers
+				writeLeechers(w, torrent, count, numWant, compact)
+			} else {
+				// If they're leeching, prioritize giving them seeders
+				writeSeeders(w, torrent, count, numWant, compact)
+				writeLeechers(w, torrent, count, numWant, compact)
+			}
+
+			if compact && peerCount != count {
+				log.Panicf("Calculated peer count (%d) != real count (%d)", peerCount, count)
+			}
+
+			if !compact {
+				writeBencoded(w, "e")
+			}
+		}
+		writeBencoded(w, "e")
+
+		return
+	}
 }
 
 func (s Server) validateAnnounceQuery(r *http.Request) (compact bool, numWant int, infohash, peerID, event, ip string, port, uploaded, downloaded, left uint64, err error) {
@@ -228,19 +292,26 @@ func determineNumWant(fallback int, pq *parsedQuery) int {
 			return fallback
 		}
 		return numWant
-	} else {
-		return fallback
 	}
+	return fallback
 }
 
 func determineIP(r *http.Request, pq *parsedQuery) (string, error) {
-	if ip, ok := pq.Params["ip"]; ok {
+	ip, ok := pq.Params["ip"]
+	ipv4, okv4 := pq.Params["ipv4"]
+	xRealIPs, xRealOk := pq.Params["X-Real-Ip"]
+
+	switch {
+	case ok:
 		return ip, nil
-	} else if ip, ok := pq.Params["ipv4"]; ok {
-		return ip, nil
-	} else if ips, ok := pq.Params["X-Real-Ip"]; ok && len(ips) > 0 {
-		return string(ips[0]), nil
-	} else {
+
+	case okv4:
+		return ipv4, nil
+
+	case xRealOk && len(xRealIPs) > 0:
+		return string(xRealIPs[0]), nil
+
+	default:
 		portIndex := len(r.RemoteAddr) - 1
 		for ; portIndex >= 0; portIndex-- {
 			if r.RemoteAddr[portIndex] == ':' {
@@ -249,8 +320,56 @@ func determineIP(r *http.Request, pq *parsedQuery) (string, error) {
 		}
 		if portIndex != -1 {
 			return r.RemoteAddr[0:portIndex], nil
-		} else {
+		}
 		return "", errors.New("Failed to parse IP address")
 	}
 }
+
+func minInt(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func writeSeeders(w http.ResponseWriter, t *storage.Torrent, count, numWant int, compact bool) {
+	for _, seed := range t.Seeders {
+		if count >= numWant {
+			break
+		}
+		if compact {
+			// TODO writeBencoded(w, compactAddr)
+		} else {
+			writeBencoded(w, "d")
+			writeBencoded(w, "ip")
+			writeBencoded(w, seed.IP)
+			writeBencoded(w, "peer id")
+			writeBencoded(w, seed.ID)
+			writeBencoded(w, "port")
+			writeBencoded(w, seed.Port)
+			writeBencoded(w, "e")
+		}
+		count++
+	}
+}
+
+func writeLeechers(w http.ResponseWriter, t *storage.Torrent, count, numWant int, compact bool) {
+	for _, leech := range t.Leechers {
+		if count >= numWant {
+			break
+		}
+		if compact {
+			// TODO writeBencoded(w, compactAddr)
+		} else {
+			writeBencoded(w, "d")
+			writeBencoded(w, "ip")
+			writeBencoded(w, leech.IP)
+			writeBencoded(w, "peer id")
+			writeBencoded(w, leech.ID)
+			writeBencoded(w, "port")
+			writeBencoded(w, leech.Port)
+			writeBencoded(w, "e")
+		}
+		count++
+	}
 }