Add database support, basic client-side event processing

util.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+)
+
+func ensureDirExists(dir string) error {
+	_, err := os.Lstat(dir)
+	if err != nil {
+		fi, err := os.Lstat(path.Dir(dir))
+		if err != nil {
+			return err
+		}
+		err = os.Mkdir(dir, fi.Mode().Perm())
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func copyToTmp(src string, tmpdir string) (string, error) {
+	infile, err := os.Open(src)
+	if err != nil {
+		return "", err
+	}
+	defer infile.Close()
+
+	outfile, err := ioutil.TempFile(tmpdir, "asink")
+	if err != nil {
+		return "", err
+	}
+	defer outfile.Close()
+
+	_, err = io.Copy(outfile, infile)
+	if err != nil {
+		return "", err
+	}
+
+	return outfile.Name(), nil
+}