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package kv
import (
"fmt"
"io"
"os"
"strings"
"src.userspace.com.au/logger/internal"
"src.userspace.com.au/logger/message"
)
// Writer implementation.
type Writer struct {
timeFormat string
writer io.Writer
}
// New creates a new Writer writer.
func New(opts ...Option) (*Writer, error) {
w := &Writer{
timeFormat: "2006-01-02T15:04:05.000Z0700",
writer: os.Stdout,
}
for _, opt := range opts {
if err := opt(w); err != nil {
return nil, err
}
}
return w, nil
}
// Write implements the message.Writer interface.
func (w Writer) Write(m message.Message) {
//fmt.Fprintf(w, "%s [%-5s] ", m.Time, m.Level)
fmt.Fprintf(w.writer, "%s ", m.Time.Format(w.timeFormat))
if l := m.Level.String(); l != "" {
fmt.Fprintf(w.writer, "[%s] ", l)
}
if m.Name != "" {
fmt.Fprintf(w.writer, "%s: ", m.Name)
}
// Write message content first
w.writer.Write([]byte(m.Content))
// Write fields before extras
for k, v := range m.Fields {
writeKV(w.writer, k, v)
}
if len(m.Extras) > 0 {
// Allow for an odd number of extras
offset := len(m.Extras) % 2
if offset != 0 {
for k, v := range m.Extras {
writeKV(w.writer, fmt.Sprintf("extra%02d", k), v)
}
} else {
for i := offset; i < len(m.Extras); i = i + 2 {
writeKV(w.writer, m.Extras[i], m.Extras[i+1])
}
}
}
w.writer.Write([]byte{'\n'})
}
func writeKV(w io.Writer, k, v interface{}) (int, error) {
return fmt.Fprintf(w, " %s=%s",
maybeQuote(internal.ToString(k)),
maybeQuote(internal.ToString(v)),
)
}
func maybeQuote(s string) string {
if strings.ContainsAny(s, " \t\n\r") {
return fmt.Sprintf("%q", s)
}
return s
}
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