Update vendor (#1265)

vendor/github.com/wiggin77/cfg/srcfile.go

@@ -0,0 +1,63 @@
+package cfg
+
+import (
+	"os"
+	"time"
+
+	"github.com/wiggin77/cfg/ini"
+)
+
+// SrcFile is a configuration `Source` backed by a file containing
+// name/value pairs or INI format.
+type SrcFile struct {
+	AbstractSourceMonitor
+	ini  ini.Ini
+	file *os.File
+}
+
+// NewSrcFileFromFilespec creates a new SrcFile with the specified filespec.
+func NewSrcFileFromFilespec(filespec string) (*SrcFile, error) {
+	file, err := os.Open(filespec)
+	if err != nil {
+		return nil, err
+	}
+	return NewSrcFile(file)
+}
+
+// NewSrcFile creates a new SrcFile with the specified os.File.
+func NewSrcFile(file *os.File) (*SrcFile, error) {
+	sf := &SrcFile{}
+	sf.freq = time.Minute
+	sf.file = file
+	if err := sf.ini.LoadFromFile(file); err != nil {
+		return nil, err
+	}
+	return sf, nil
+}
+
+// GetProps fetches all the properties from a source and returns
+// them as a map.
+func (sf *SrcFile) GetProps() (map[string]string, error) {
+	lm, err := sf.GetLastModified()
+	if err != nil {
+		return nil, err
+	}
+
+	// Check if we need to reload.
+	if sf.ini.GetLastModified() != lm {
+		if err := sf.ini.LoadFromFile(sf.file); err != nil {
+			return nil, err
+		}
+	}
+	return sf.ini.ToMap(), nil
+}
+
+// GetLastModified returns the time of the latest modification to any
+// property value within the source.
+func (sf *SrcFile) GetLastModified() (time.Time, error) {
+	fi, err := sf.file.Stat()
+	if err != nil {
+		return time.Now(), err
+	}
+	return fi.ModTime(), nil
+}