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package json
import (
"encoding/json"
"fmt"
"io"
"os"
"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
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 logger.Writer interface
func (w Writer) Write(m message.Message) {
vals := map[string]interface{}{
"_name": m.Name,
"_time": m.Time.Format(w.timeFormat),
"_message": m.Content,
}
if l := m.Level.String(); l != "" {
vals["_level"] = m.Level.String()
}
for k, v := range m.Fields {
vals[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 {
vals[fmt.Sprintf("extra%02d", k)] = v
}
} else {
for i := offset; i < len(m.Extras); i = i + 2 {
vals[internal.ToString(m.Extras[i])] = m.Extras[i+1]
}
}
}
if err := json.NewEncoder(w.writer).Encode(vals); err != nil {
fmt.Fprintf(w.writer, "\"failed to encode JSON: %s\"", err)
}
}
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