feat: Add JSON logging

Signed-off-by: Julien Riou <julien@riou.xyz>

notifier/file.go

@@ -1,6 +1,7 @@
 package notifier
 
 import (
+	"encoding/json"
 	"os"
 	"sync"
 	"time"
@@ -19,7 +20,7 @@ type File struct {
 }
 
 // NewFile creates a file notifier
-func NewFile(format string, name string, sessions chan *base.Session) Notifier {
+func NewFile(name string, format string, sessions chan *base.Session) Notifier {
 	return &File{
 		name:     name,
 		format:   format,
@@ -35,11 +36,27 @@ func (f *File) Run() {
 
 	for session := range f.sessions {
 		timestamp := time.Now().Format(time.RFC3339)
-		_, err := f.handle.WriteString(timestamp + " " + session.Format(f.format) + "\n")
+		var line string
+		if f.format == "json" {
+			line = jsonLine(timestamp, session)
+		} else {
+			line = timestamp + " " + session.Format(f.format)
+		}
+		_, err := f.handle.WriteString(line + "\n")
 		base.Panic(err)
 	}
 }
 
+// jsonLine marshals a session as a self-contained JSON object including the
+// timestamp, so each file line stays valid JSON instead of being prefixed
+func jsonLine(timestamp string, session *base.Session) string {
+	b, _ := json.Marshal(struct {
+		Timestamp string `json:"timestamp"`
+		*base.Session
+	}{timestamp, session})
+	return string(b)
+}
+
 // open opens a log file
 func (f *File) open() {
 	var err error