announce type; renames; docs

server/bencode.go

@@ -0,0 +1,49 @@
+package server
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+)
+
+func writeBencoded(w io.Writer, data interface{}) {
+	switch v := data.(type) {
+	case string:
+		str := fmt.Sprintf("%s:%s", strconv.Itoa(len(v)), v)
+		io.WriteString(w, str)
+	case int:
+		str := fmt.Sprintf("i%se", strconv.Itoa(v))
+		io.WriteString(w, str)
+	case uint:
+		str := fmt.Sprintf("i%se", strconv.FormatUint(uint64(v), 10))
+		io.WriteString(w, str)
+	case int64:
+		str := fmt.Sprintf("i%se", strconv.FormatInt(v, 10))
+		io.WriteString(w, str)
+	case uint64:
+		str := fmt.Sprintf("i%se", strconv.FormatUint(v, 10))
+		io.WriteString(w, str)
+	case time.Duration: // Assume seconds
+		str := fmt.Sprintf("i%se", strconv.FormatInt(int64(v/time.Second), 10))
+		io.WriteString(w, str)
+	case map[string]interface{}:
+		io.WriteString(w, "d")
+		for key, val := range v {
+			str := fmt.Sprintf("%s:%s", strconv.Itoa(len(key)), key)
+			io.WriteString(w, str)
+			writeBencoded(w, val)
+		}
+		io.WriteString(w, "e")
+	case []string:
+		io.WriteString(w, "l")
+		for _, val := range v {
+			writeBencoded(w, val)
+		}
+		io.WriteString(w, "e")
+	default:
+		// Although not currently necessary,
+		// should handle []interface{} manually; Go can't do it implicitly
+		panic("Tried to bencode an unsupported type!")
+	}
+}