fmt=json (http only)

cmd/circologd/format.go

@@ -1,7 +1,9 @@
-package circolog
+package main
 
 import (
-	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
 	"text/template"
 	"time"
 
@@ -31,9 +33,32 @@ func init() {
 	))
 }
 
-// FormatSyslog format a message in the typical format used in /var/log/messages
-func FormatSyslog(msg format.LogParts) string {
-	var buf bytes.Buffer
-	syslogTmpl.Execute(&buf, msg)
-	return buf.String()
+type renderFormat int
+
+func parseRenderFormat(s string) (renderFormat, error) {
+	switch s {
+	case "json":
+		return formatJSON, nil
+	case "syslog":
+		return formatSyslog, nil
+	default:
+		return 0, fmt.Errorf("Undefined format `%s`", s)
+	}
+}
+
+const (
+	formatSyslog = iota // 0
+	formatJSON   = iota
+)
+
+func writeFormatted(w io.Writer, f renderFormat, msg format.LogParts) error {
+	switch f {
+	case formatSyslog:
+		return syslogTmpl.Execute(w, msg)
+	case formatJSON:
+		enc := json.NewEncoder(w)
+		enc.SetIndent("", "  ")
+		return enc.Encode(msg)
+	}
+	return nil
 }

cmd/circologd/http.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"fmt"
 	"log"
 	"net/http"
 	"strconv"
@@ -36,7 +37,7 @@ func parseParameterL(r *http.Request) (int, error) {
 	return requestMessageLen, nil
 }
 
-func parseParameters(w http.ResponseWriter, r *http.Request) (circolog.ClientOptions, error) {
+func parseParameters(r *http.Request) (circolog.ClientOptions, error) {
 	var opts circolog.ClientOptions
 	err := r.ParseForm()
 	if err != nil {
@@ -52,13 +53,46 @@ func parseParameters(w http.ResponseWriter, r *http.Request) (circolog.ClientOpt
 	return opts, err
 }
 
+type renderOptions struct { // those are options relevant to the rendered (that is, the HTTP side of circologd)
+	Format renderFormat
+}
+
+func parseRenderParameters(r *http.Request) (renderOptions, error) {
+	opts := renderOptions{}
+	err := r.ParseForm()
+	if err != nil {
+		log.Println("error parsing http request", err)
+		return opts, err
+	}
+	if val, ok := r.Form["fmt"]; ok {
+		if len(val) != 1 {
+			return opts, errors.New("Format repeated multiple times")
+		}
+		format, err := parseRenderFormat(val[0])
+		if err != nil {
+			return opts, err
+		}
+		opts.Format = format
+	}
+	return opts, nil
+}
+
 func getHTTPHandler(hub circolog.Hub) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		// Looking for known parameter in the request
-		opts, err := parseParameters(w, r)
+		render_opts, err := parseRenderParameters(r)
+		if err != nil {
+			log.Println("Error parsing:", err)
+			w.WriteHeader(400)
+			fmt.Fprintln(w, err)
+			return
+		}
+
+		opts, err := parseParameters(r)
 		if err != nil {
 			log.Println("Error on request parameter \"l\":", err)
 			w.WriteHeader(400)
+			fmt.Fprintln(w, err)
 			return
 		}
 		opts.Nofollow = true
@@ -70,8 +104,10 @@ func getHTTPHandler(hub circolog.Hub) http.HandlerFunc {
 		hub.Register <- client
 
 		for x := range client.Messages {
-			w.Write([]byte(circolog.FormatSyslog(x)))
-			w.Write([]byte("\n"))
+			writeFormatted(w, render_opts.Format, x)
+			if render_opts.Format != formatJSON { // bleah
+				w.Write([]byte("\n"))
+			}
 		}
 	}
 }
@@ -82,7 +118,7 @@ func getWSHandler(hub circolog.Hub) http.HandlerFunc {
 		WriteBufferSize: 1024,
 	}
 	return func(w http.ResponseWriter, r *http.Request) {
-		opts, err := parseParameters(w, r)
+		opts, err := parseParameters(r)
 		if err != nil {
 			log.Println("Error on request parameter \"l\":", err)
 			w.WriteHeader(400)
@@ -120,7 +156,7 @@ func getWSHandler(hub circolog.Hub) http.HandlerFunc {
 					if err != nil {
 						return
 					}
-					w.Write([]byte(circolog.FormatSyslog(message)))
+					writeFormatted(w, formatSyslog, message)
 
 					if err := w.Close(); err != nil {
 						return