Update vendor (#1265)

vendor/github.com/mattermost/logr/formatter.go

@@ -0,0 +1,119 @@
+package logr
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"runtime"
+	"sort"
+)
+
+// Formatter turns a LogRec into a formatted string.
+type Formatter interface {
+	// Format converts a log record to bytes. If buf is not nil then it will be
+	// be filled with the formatted results, otherwise a new buffer will be allocated.
+	Format(rec *LogRec, stacktrace bool, buf *bytes.Buffer) (*bytes.Buffer, error)
+}
+
+const (
+	// DefTimestampFormat is the default time stamp format used by
+	// Plain formatter and others.
+	DefTimestampFormat = "2006-01-02 15:04:05.000 Z07:00"
+)
+
+// DefaultFormatter is the default formatter, outputting only text with
+// no colors and a space delimiter. Use `format.Plain` instead.
+type DefaultFormatter struct {
+}
+
+// Format converts a log record to bytes.
+func (p *DefaultFormatter) Format(rec *LogRec, stacktrace bool, buf *bytes.Buffer) (*bytes.Buffer, error) {
+	if buf == nil {
+		buf = &bytes.Buffer{}
+	}
+	delim := " "
+	timestampFmt := DefTimestampFormat
+
+	fmt.Fprintf(buf, "%s%s", rec.Time().Format(timestampFmt), delim)
+	fmt.Fprintf(buf, "%v%s", rec.Level(), delim)
+	fmt.Fprint(buf, rec.Msg(), delim)
+
+	ctx := rec.Fields()
+	if len(ctx) > 0 {
+		WriteFields(buf, ctx, " ")
+	}
+
+	if stacktrace {
+		frames := rec.StackFrames()
+		if len(frames) > 0 {
+			buf.WriteString("\n")
+			WriteStacktrace(buf, rec.StackFrames())
+		}
+	}
+	buf.WriteString("\n")
+
+	return buf, nil
+}
+
+// WriteFields writes zero or more name value pairs to the io.Writer.
+// The pairs are sorted by key name and output in key=value format
+// with optional separator between fields.
+func WriteFields(w io.Writer, flds Fields, separator string) {
+	keys := make([]string, 0, len(flds))
+	for k := range flds {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	sep := ""
+	for _, key := range keys {
+		writeField(w, key, flds[key], sep)
+		sep = separator
+	}
+}
+
+func writeField(w io.Writer, key string, val interface{}, sep string) {
+	var template string
+	switch v := val.(type) {
+	case error:
+		val := v.Error()
+		if shouldQuote(val) {
+			template = "%s%s=%q"
+		} else {
+			template = "%s%s=%s"
+		}
+	case string:
+		if shouldQuote(v) {
+			template = "%s%s=%q"
+		} else {
+			template = "%s%s=%s"
+		}
+	default:
+		template = "%s%s=%v"
+	}
+	fmt.Fprintf(w, template, sep, key, val)
+}
+
+// shouldQuote returns true if val contains any characters that might be unsafe
+// when injecting log output into an aggregator, viewer or report.
+func shouldQuote(val string) bool {
+	for _, c := range val {
+		if !((c >= '0' && c <= '9') ||
+			(c >= 'a' && c <= 'z') ||
+			(c >= 'A' && c <= 'Z')) {
+			return true
+		}
+	}
+	return false
+}
+
+// WriteStacktrace formats and outputs a stack trace to an io.Writer.
+func WriteStacktrace(w io.Writer, frames []runtime.Frame) {
+	for _, frame := range frames {
+		if frame.Function != "" {
+			fmt.Fprintf(w, "  %s\n", frame.Function)
+		}
+		if frame.File != "" {
+			fmt.Fprintf(w, "      %s:%d\n", frame.File, frame.Line)
+		}
+	}
+}