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statsview.go
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statsview.go
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package statsview
import (
"context"
"fmt"
"net/http"
"net/http/pprof"
"time"
"github.com/go-echarts/go-echarts/v2/components"
"github.com/go-echarts/go-echarts/v2/templates"
"github.com/rs/cors"
"github.com/go-echarts/statsview/statics"
"github.com/go-echarts/statsview/viewer"
)
// ViewManager
type ViewManager struct {
srv *http.Server
Smgr *viewer.StatsMgr
Ctx context.Context
Cancel context.CancelFunc
Views []viewer.Viewer
}
// Register registers views to the ViewManager
func (vm *ViewManager) Register(views ...viewer.Viewer) {
vm.Views = append(vm.Views, views...)
}
// Start runs a http server and begin to collect metrics
func (vm *ViewManager) Start() error {
return vm.srv.ListenAndServe()
}
// Stop shutdown the http server gracefully
func (vm *ViewManager) Stop() {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
vm.srv.Shutdown(ctx)
vm.Cancel()
}
func init() {
templates.PageTpl = `
{{- define "page" }}
<!DOCTYPE html>
<html>
{{- template "header" . }}
<body>
<p> 馃殌 <a href="https://github.com/go-echarts/statsview"><b>StatsView</b></a> <em>is a real-time Golang runtime stats visualization profiler</em></p>
<style> .box { justify-content:center; display:flex; flex-wrap:wrap } </style>
<div class="box"> {{- range .Charts }} {{ template "base" . }} {{- end }} </div>
</body>
</html>
{{ end }}
`
}
// New creates a new ViewManager instance
func New() *ViewManager {
page := components.NewPage()
page.PageTitle = "Statsview"
page.AssetsHost = fmt.Sprintf("http://%s/debug/statsview/statics/", viewer.LinkAddr())
page.Assets.JSAssets.Add("jquery.min.js")
mgr := &ViewManager{
srv: &http.Server{
Addr: viewer.Addr(),
ReadTimeout: time.Minute,
WriteTimeout: time.Minute,
MaxHeaderBytes: 1 << 20,
},
}
mgr.Ctx, mgr.Cancel = context.WithCancel(context.Background())
mgr.Register(
viewer.NewGoroutinesViewer(),
viewer.NewHeapViewer(),
viewer.NewStackViewer(),
viewer.NewGCNumViewer(),
viewer.NewGCSizeViewer(),
viewer.NewGCCPUFractionViewer(),
)
smgr := viewer.NewStatsMgr(mgr.Ctx)
for _, v := range mgr.Views {
v.SetStatsMgr(smgr)
}
mux := http.NewServeMux()
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
for _, v := range mgr.Views {
page.AddCharts(v.View())
mux.HandleFunc("/debug/statsview/view/"+v.Name(), v.Serve)
}
mux.HandleFunc("/debug/statsview", func(w http.ResponseWriter, _ *http.Request) {
page.Render(w)
})
staticsPrev := "/debug/statsview/statics/"
mux.HandleFunc(staticsPrev+"echarts.min.js", func(w http.ResponseWriter, _ *http.Request) {
w.Write([]byte(statics.EchartJS))
})
mux.HandleFunc(staticsPrev+"jquery.min.js", func(w http.ResponseWriter, _ *http.Request) {
w.Write([]byte(statics.JqueryJS))
})
mux.HandleFunc(staticsPrev+"themes/westeros.js", func(w http.ResponseWriter, _ *http.Request) {
w.Write([]byte(statics.WesterosJS))
})
mux.HandleFunc(staticsPrev+"themes/macarons.js", func(w http.ResponseWriter, _ *http.Request) {
w.Write([]byte(statics.MacaronsJS))
})
mgr.srv.Handler = cors.AllowAll().Handler(mux)
return mgr
}