gosimviewer: filter by log level

Author: jellevandenhooff

internal/gosimlog/main.go

@@ -19,7 +19,7 @@ type Log struct {
 	Index int `json:"-"`
 
 	Time        time.Time     `json:"time"`
-	Level       string        `json:"level"`
+	Level       slog.Level    `json:"level"`
 	Msg         string        `json:"msg"`
 	Source      *Stackframe   `json:"source"`
 	Step        int           `json:"step"`

internal/gosimviewer/index.html.tmpl

@@ -18,13 +18,16 @@ a {
 <div style="display: flex; overflow: hide; height: 100%">
     <div style="width: 50%; display: flex; flex-direction: column;">
         <div>
-            <pre>focus: {{ if .Focus }}{{ .Focus }} <a href="/">all logs</a>{{ else }}all logs{{ end }}</pre>
+            {{ $level := .LogLevel }}
+            {{ $focus := .Focus }}
+            <pre>focus: {{ if .Focus }}{{ .Focus }} <a href="/?level={{ $level }}">all logs</a>{{ else }}all logs{{ end }}</pre>
+            <pre>log level:{{ range .LogLevels }} {{ if eq . $level }}{{ . }}{{ else }}<a href="/?level={{ . }}&focus={{ $focus }}">{{ . }}</a>{{ end }}{{ end }}</pre>
         </div>
         <div style="overflow: scroll; font-family: monospace;">
 {{ range .Logs }}
     <span>
         {{ .Step }}
-        <a href="/?focus=machine:{{ .Machine }}">{{ .Machine }}</a>/<a href="/?focus=goroutine:{{ .Goroutine }}">{{.Goroutine}}</a>
+        <a href="/?level={{ $level }}&focus=machine:{{ .Machine }}">{{ .Machine }}</a>/<a href="/?level={{ $level }}&focus=goroutine:{{ .Goroutine }}">{{.Goroutine}}</a>
         {{.Time | Time }}
         {{ .Level }}
         <a href="#" onclick="show({index: {{ .Index }}, source: {{ .Source }} })">{{ .Source | Source }}</a>

internal/gosimviewer/main.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"html/template"
 	"log"
+	"log/slog"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -72,9 +73,22 @@ func filter(logs []*gosimlog.Log, f func(*gosimlog.Log) bool) []*gosimlog.Log {
 func (s *Server) Index(w http.ResponseWriter, r *http.Request) {
 	q := r.URL.Query()
 	focusStr := q.Get("focus")
+	levelStr := q.Get("level")
 
 	logs := s.Logs
 
+	level := slog.LevelInfo
+	if levelStr != "" {
+		if err := level.UnmarshalText([]byte(levelStr)); err != nil {
+			http.Error(w, fmt.Sprintf("parsing level: %s", err.Error()), http.StatusBadRequest)
+			return
+		}
+	}
+
+	logs = filter(logs, func(l *gosimlog.Log) bool {
+		return l.Level >= level
+	})
+
 	if focusStr != "" {
 		kind, arg, _ := strings.Cut(focusStr, ":")
 
@@ -100,8 +114,10 @@ func (s *Server) Index(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := templates.ExecuteTemplate(w, "index.html.tmpl", map[string]any{
-		"Logs":  logs,
-		"Focus": focusStr,
+		"Logs":      logs,
+		"Focus":     focusStr,
+		"LogLevels": []slog.Level{slog.LevelDebug, slog.LevelInfo, slog.LevelWarn, slog.LevelError},
+		"LogLevel":  level,
 	}); err != nil {
 		http.Error(w, fmt.Sprintf("writing template: %s", err.Error()), http.StatusInternalServerError)
 		return