Start making CGI multi-network

spongy.cgi/network.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"path"
+	"strconv"
+	"os"
+)
+
+type Network struct {
+	name string
+	currentLog string
+	lineno int64
+
+	basePath string
+}
+
+type Update struct {
+	Lines []string
+	LastEventId string
+}
+
+func NewNetwork(basePath string) (*Network) {
+	return &Network{
+		basePath: basePath,
+	}
+}
+
+func (nw *Network) LastEventId() string {
+	return fmt.Sprintf("%s:%s:%d", nw.name, nw.currentLog, nw.lineno)
+}
+
+func (nw *Network) SetPosition(filename string, lineno int64) {
+	nw.currentLog = filename
+	nw.lineno = lineno
+}
+
+func (nw *Network) Tail(out chan<- *Update) error {
+	if nw.currentLog == "" {
+		currentfn := path.Join(nw.basePath, "log", "current")
+		nw.currentfn, err := os.Readlink(currentfn)
+		if err != nil {
+			return err
+		}
+	}
+	
+	filepath := path.Join(nw.basePath, "log", nw.currentLog)
+	f, err := os.Open(filepath)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return err
+	}
+	defer watcher.Close()
+	
+	watcher.add(filepath)
+	
+	for {
+		lines := make([]string, 0)
+		bf := bufio.NewScanner(f)
+		for bf.Scan() {
+			t := bf.Text()
+			nw.lineno += 1
+			
+			parts := strings.Split(t, " ")
+			if (len(parts) >= 4) && (parts[2] == "NEXTLOG") {
+				watcher.Remove(filepath)
+				filename = parts[3]
+				filepath = path.Join(NetworkDir, filename)
+				f.Close()
+				f, err = os.Open(filepath)
+				if err != nil {
+					return err
+				}
+				watcher.Add(filepath)
+				nw.lineno = 0
+			}
+			lines = append(lines, t))
+		}
+		if len(update.Lines) > 0 {
+			update := Update{
+				Lines: lines,
+				LastEventId: nw.LastEventId(),
+			}
+			out <- &update
+		}
+		
+		select {
+		case _ = <-watcher.Events:
+			// Somethin' happened!
+		case err := <-watcher.Errors:
+			return err
+		}
+	}
+	
+	return nil
+}
+
+func (nw *Network) Write(line string) {
+	fn := path.Join(nw.baseDir